Chapter 20 QuasiResonant Converters


 Lenard Perkins
 4 years ago
 Views:
Transcription
1 Chapter 0 QuasiResonant Converters Introduction 0.1 The zerocurrentswitching quasiresonant switch cell Waveforms of the halfwave ZCS quasiresonant switch cell 0.1. The average terminal waveforms The fullwave ZCS quasiresonant switch cell 0. Resonant switch topologies 0..1 The zerovoltageswitching quasiresonant switch 0.. The zerovoltageswitching multiresonant switch 0..3 Quasisquarewave resonant switches 0.3 Ac modeling of quasiresonant converters 0.4 Summary of key points Fundamentals of Power Electronics 1 Chapter 0: QuasiResonant Converters
2 The resonant switch concept A quite general idea: 1. PWM switch network is replaced by a resonant switch network. This leads to a quasiresonant version of the original PWM converter Example: realization of the switch cell in the buck converter i L i PWM switch cell i v g v 1 Switch cell C R v v 1 Fundamentals of Power Electronics Chapter 0: QuasiResonant Converters
3 Two quasiresonant switch cells D 1 Q 1 i r i D 1 i r i v 1 v 1r v 1 v 1r Q 1 Switch network Switch network Halfwave ZCS quasiresonant switch cell Fullwave ZCS quasiresonant switch cell Insert either of the above switch cells into the buck converter, to obtain a ZCS quasiresonant version of the buck converter. and are small in value, and their resonant frequency f 0 is greater than the switching frequency f s. f 0 = 1 π = ω 0 π v g v 1 Switch cell i L i C R v Fundamentals of Power Electronics 3 Chapter 0: QuasiResonant Converters
4 0.1 The zerocurrentswitching quasiresonant switch cell Tank inductor in series with transistor: transistor switches at zero crossings of inductor current waveform Tank capacitor in parallel with diode : diode switches at zero crossings of capacitor voltage waveform v 1 v 1r D 1 Q 1 Switch network i r i Twoquadrant switch is required: Halfwave ZCS quasiresonant switch cell Halfwave: Q 1 and D 1 in series, transistor turns off at first zero crossing of current waveform D 1 i r i Fullwave: Q 1 and D 1 in parallel, transistor turns off at second zero crossing of current waveform Performances of halfwave and fullwave cells differ significantly. v 1 v 1r Q 1 Switch network Fullwave ZCS quasiresonant switch cell Fundamentals of Power Electronics 4 Chapter 0: QuasiResonant Converters
5 Averaged switch modeling of ZCS cells It is assumed that the converter filter elements are large, such that their switching ripples are small. Hence, we can make the small ripple approximation as usual, for these elements: i i Ts v 1 v 1 Ts In steady state, we can further approximate these quantities by their dc values: i I v 1 V 1 Modeling objective: find the average values of the terminal waveforms T s and T s Fundamentals of Power Electronics 5 Chapter 0: QuasiResonant Converters
6 The switch conversion ratio µ A generalization of the duty cycle d D 1 Q 1 i r The switch conversion ratio µ is the ratio of the average terminal voltages of the switch network. It can be applied to nonpwm switch networks. For the CCM PWM case, µ = d. v 1 Ts v 1r Switch network Halfwave ZCS quasiresonant switch cell i Ts If V/V g = M(d) for a PWM CCM converter, then V/V g = M(µ) for the same converter with a switch network having conversion ratio µ. Generalized switch averaging, and µ, are defined and discussed in Section i i Ts v 1 v 1 Ts In steady state: i I v 1 V 1 µ = Ts v 1r Ts = µ = V V 1 = I 1 I Ts i r Ts Fundamentals of Power Electronics 6 Chapter 0: QuasiResonant Converters
7 0.1.1 Waveforms of the halfwave ZCS quasiresonant switch cell The halfwave ZCS quasiresonant switch cell, driven by the terminal quantities v 1 Ts and i Ts. Waveforms: I D 1 Q 1 i r V 1 Subinterval: θ = ω 0 t v 1 Ts v 1r i Ts Switch network Halfwave ZCS quasiresonant switch cell α β V c1 I δ ξ Each switching period contains four subintervals Conducting devices: ω 0 T s Q 1 Q 1 X D 1 D 1 Fundamentals of Power Electronics 7 Chapter 0: QuasiResonant Converters
8 Subinterval 1 Diode is initially conducting the filter inductor current I. Transistor Q 1 turns on, and the tank inductor current starts to increase. So all semiconductor devices conduct during this subinterval, and the circuit reduces to: Circuit equations: d = V 1 with i dt L 1 (0) = 0 r Solution: where R 0 = = V 1 t = ω 0 t V 1 R 0 V 1 I This subinterval ends when diode becomes reversebiased. This occurs at time ω 0 t = α, when = I. (α)=α V 1 R 0 = I α = I R 0 V 1 Fundamentals of Power Electronics 8 Chapter 0: QuasiResonant Converters
9 Subinterval Diode is off. Transistor Q 1 conducts, and the tank inductor and tank capacitor ring sinusoidally. The circuit reduces to: V 1 The circuit equations are di L 1 (ω 0 t) r dt dv C (ω 0 t) r dt i c = V 1 (ω 0 t) (α)=0 = (ω 0 t)i (α)=i I The solution is (ω 0 t)=i V 1 R 0 sin ω 0 t α (ω 0 t)=v 1 1 cos ω 0 t α The dc components of these waveforms are the dc solution of the circuit, while the sinusoidal components have magnitudes that depend on the initial conditions and on the characteristic impedance R 0. Fundamentals of Power Electronics 9 Chapter 0: QuasiResonant Converters
10 Subinterval continued Peak inductor current: I 1pk = I V 1 R 0 (ω 0 t)=i V 1 R 0 sin ω 0 t α (ω 0 t)=v 1 1 cos ω 0 t α This subinterval ends at the first zero crossing of. Define β = angular length of subinterval. Then (α β)=i V 1 R 0 sin β = 0 sin β = I R 0 V 1 Must use care to select the correct branch of the arcsine function. Note (from the waveform) that β > π. I V 1 Subinterval: Hence α β ω 0 T s β = π sin 1 I R 0 V 1 π < sin1 x π I < V 1 R 0 δ ξ θ = ω 0 t Fundamentals of Power Electronics 10 Chapter 0: QuasiResonant Converters
11 Boundary of zero current switching If the requirement I < V 1 R 0 is violated, then the inductor current never reaches zero. In consequence, the transistor cannot switch off at zero current. The resonant switch operates with zero current switching only for load currents less than the above value. The characteristic impedance must be sufficiently small, so that the ringing component of the current is greater than the dc load current. Capacitor voltage at the end of subinterval is (α β)=v c1 = V I R 0 V 1 Fundamentals of Power Electronics 11 Chapter 0: QuasiResonant Converters
12 Subinterval 3 All semiconductor devices are off. The circuit reduces to: I The circuit equations are dv C (ω 0 t) r =I dt (α β)=v c1 Subinterval 3 ends when the tank capacitor voltage reaches zero, and diode becomes forwardbiased. Define δ = angular length of subinterval 3. Then (α β δ)=v c1 I R 0 δ =0 δ = V c1 = V I R 0 I R 0 I R 0 V 1 The solution is (ω 0 t)=v c1 I R 0 ω 0 t α β Fundamentals of Power Electronics 1 Chapter 0: QuasiResonant Converters
13 Subinterval 4 Subinterval 4, of angular length ξ, is identical to the diode conduction interval of the conventional PWM switch network. Diode conducts the filter inductor current I The tank capacitor voltage is equal to zero. Transistor Q 1 is off, and the input current is equal to zero. The length of subinterval 4 can be used as a control variable. Increasing the length of this interval reduces the average output voltage. Fundamentals of Power Electronics 13 Chapter 0: QuasiResonant Converters
14 Maximum switching frequency The length of the fourth subinterval cannot be negative, and the switching period must be at least long enough for the tank current and voltage to return to zero by the end of the switching period. The angular length of the switching period is ω 0 T s = α β δ ξ = π f 0 = f π s F where the normalized switching frequency F is defined as F = f s f 0 So the minimum switching period is ω 0 T s α β δ Substitute previous solutions for subinterval lengths: π I R 0 π sin F V 1 I R 0 V I R 0 1 V 1 I R 0 V 1 Fundamentals of Power Electronics 14 Chapter 0: QuasiResonant Converters
15 0.1. The average terminal waveforms Averaged switch modeling: we need to determine the average values of and. The average switch input current is given by v 1 Ts v 1r D 1 Q 1 Switch network i r i Ts Ts = 1 T s t t T s dt = q 1 q T s q 1 and q are the areas under the current waveform during subintervals 1 and. q 1 is given by the triangle area formula: I Halfwave ZCS quasiresonant switch cell q 1 q Ts q 1 = 0 α ω 0 dt = 1 α ω 0 I α ω 0 α β ω 0 t Fundamentals of Power Electronics 15 Chapter 0: QuasiResonant Converters
16 Charge arguments: computation of q q = α β ω 0 α ω 0 dt Node equation for subinterval : I q 1 q Ts =i C I Substitute: α ω 0 α β ω 0 t q = α β α ω 0 α β ω 0 ω 0 i C dt I dt α ω 0 Second term is integral of constant I : α β α ω 0 ω 0 β I dt = I ω0 V 1 i c Circuit during subinterval I Fundamentals of Power Electronics 16 Chapter 0: QuasiResonant Converters
17 Charge arguments continued q = α β α ω 0 α β ω 0 ω 0 i C dt I dt α ω 0 First term: integral of the capacitor current over subinterval. This can be related to the change in capacitor voltage : α β α ω 0 ω 0 α β i C dt = C ω v α 0 ω0 α β V c1 I Substitute results for the two integrals: q = CV c1 I δ β ω0 ξ α β ω 0 α ω 0 i C dt = C V c1 0 = CV c1 Substitute into expression for average switch input current: Ts = αi ω 0 T s CV c1 T s βi ω 0 T s Fundamentals of Power Electronics 17 Chapter 0: QuasiResonant Converters
18 Switch conversion ratio µ µ = Ts I = α ω 0 T s CV c1 I T s β ω 0 T s Eliminate α, β, V c1 using previous results: where µ = F 1 π 1 J s π sin 1 (J s ) 1 J s 1 1J s J s = I R 0 V 1 Fundamentals of Power Electronics 18 Chapter 0: QuasiResonant Converters
19 Analysis result: switch conversion ratio µ Switch conversion ratio: µ = F 1 π 1 J s π sin 1 (J s ) 1 J s 1 1J s with J s = I R 0 V 1 P1 J s 10 This is of the form µ = FP1 J s P1 J s = 1 π 1 J s π sin 1 (J s ) 1 J s 1 1J s J s Fundamentals of Power Electronics 19 Chapter 0: QuasiResonant Converters
20 Characteristics of the halfwave ZCS resonant switch ZCS boundary Switch characteristics: µ = FP1 J s max F boundary J s Mode boundary: J s 1 0. F = µ 1 J sf 4π µ Fundamentals of Power Electronics 0 Chapter 0: QuasiResonant Converters
21 Buck converter containing halfwave ZCS quasiresonant switch Conversion ratio of the buck converter is (from inductor voltsecond balance): M = V V g = µ ZCS boundary 1 For the buck converter, J s = IR 0 V g ZCS occurs when J s max F boundary I V g R 0 Output voltage varies over the range 0 V V g FIR 0 4π F = µ Fundamentals of Power Electronics 1 Chapter 0: QuasiResonant Converters
22 Boost converter example For the boost converter, M = V V g = 1 1µ I g L i J s = I R 0 = I gr 0 V 1 V I g = I 1µ V g D 1 v 1 C R V Halfwave ZCS equations: Q 1 µ = FP1 J s P1 J s = 1 π 1 J s π sin 1 (J s ) 1 J s 1 1J s Fundamentals of Power Electronics Chapter 0: QuasiResonant Converters
23 0.1.3 The fullwave ZCS quasiresonant switch cell Half wave D 1 Q 1 i r i v 1 v 1r I V 1 Switch network Subinterval: θ = ω 0 t Halfwave ZCS quasiresonant switch cell Full wave D 1 i r i v 1 v 1r Q 1 I V 1 Switch network Subinterval: θ = ω 0 t Fullwave ZCS quasiresonant switch cell Fundamentals of Power Electronics 3 Chapter 0: QuasiResonant Converters
24 Analysis: fullwave ZCS Analysis in the fullwave case is nearly the same as in the halfwave case. The second subinterval ends at the second zero crossing of the tank inductor current waveform. The following quantities differ: β = π sin1 J s (half wave) π sin 1 J s (full wave) V c1 = V 1 1 1J s V 1 1 1J s (half wave) (full wave) In either case, µ is given by µ = Ts I = α ω 0 T s CV c1 I T s β ω 0 T s Fundamentals of Power Electronics 4 Chapter 0: QuasiResonant Converters
25 Fullwave cell: switch conversion ratio µ P 1 J s = 1 π 1 J s π sin 1 (J s ) 1 J s 1 1J s µ = FP 1 J s 1 ZCS boundary Fullwave case: P 1 can be approximated as 0.8 F = max F boundary so P 1 J s 1 µ F = f s f 0 J s µ Fundamentals of Power Electronics 5 Chapter 0: QuasiResonant Converters
26 0. Resonant switch topologies Basic ZCS switch cell: i r i SW v 1 v 1r Switch network SPST switch SW: ZCS quasiresonant switch cell Voltagebidirectional twoquadrant switch for halfwave cell Currentbidirectional twoquadrant switch for fullwave cell Connection of resonant elements: Can be connected in other ways that preserve highfrequency components of tank waveforms Fundamentals of Power Electronics 6 Chapter 0: QuasiResonant Converters
27 Connection of tank capacitor Connection of tank capacitor to two other points at ac ground. This simply changes the dc component of tank capacitor voltage. V g SW ZCS quasiresonant switch i L C R V The ac highfrequency components of the tank waveforms are unchanged. V g SW i L C R V ZCS quasiresonant switch Fundamentals of Power Electronics 7 Chapter 0: QuasiResonant Converters
28 A test to determine the topology of a resonant switch network Replace converter elements by their highfrequency equivalents: Independent voltage source V g : short circuit Filter capacitors: short circuits Filter inductors: open circuits The resonant switch network remains. If the converter contains a ZCS quasiresonant switch, then the result of these operations is SW Fundamentals of Power Electronics 8 Chapter 0: QuasiResonant Converters
29 Zerocurrent and zerovoltage switching ZCS quasiresonant switch: Tank inductor is in series with switch; hence SW switches at zero current Tank capacitor is in parallel with diode ; hence switches at zero voltage SW Discussion Zero voltage switching of eliminates switching loss arising from stored charge. Zero current switching of SW: device Q 1 and D 1 output capacitances lead to switching loss. In fullwave case, stored charge of diode D 1 leads to switching loss. Peak transistor current is (1 J s ) V g /R 0, or more than twice the PWM value. Fundamentals of Power Electronics 9 Chapter 0: QuasiResonant Converters
30 0..1 The zerovoltageswitching quasiresonant switch cell When the previouslydescribed operations are followed, then the converter reduces to SW A fullwave version based on the PWM buck converter: v Cr D 1 i Lr i L I V g v 1 Q 1 C R V Fundamentals of Power Electronics 30 Chapter 0: QuasiResonant Converters
31 ZVS quasiresonant switch cell Switch conversion ratio Tank waveforms µ =1FP1 1 Js halfwave v Cr V 1 µ =1FP 1 1 Js fullwave Subinterval: θ = ω 0 t ZVS boundary i Lr I J s 1 peak transistor voltage V cr,pk =(1J s ) V 1 α β δ ξ A problem with the quasiresonant ZVS switch cell: peak transistor voltage becomes very large when zero voltage switching is required for a large range of load currents. Conducting devices: X ω 0 T s D 1D Q 1 Q 1 Fundamentals of Power Electronics 31 Chapter 0: QuasiResonant Converters
32 0.. The ZVS multiresonant switch C s When the previouslydescribed operations are followed, then the converter reduces to SW C d A halfwave version based on the PWM buck converter: C s i L I D 1 V g v 1 Q 1 C d C R V Fundamentals of Power Electronics 3 Chapter 0: QuasiResonant Converters
33 0..3 Quasisquarewave resonant switches When the previouslydescribed operations are followed, then the converter reduces to ZCS SW ZVS SW Fundamentals of Power Electronics 33 Chapter 0: QuasiResonant Converters
34 A quasisquarewave ZCS buck with input filter L f D 1 Q 1 L I V g C R V C f The basic ZCS QSW switch cell is restricted to 0 µ 0.5 Peak transistor current is equal to peak transistor current of PWM cell Peak transistor voltage is increased Zerocurrent switching in all semiconductor devices Fundamentals of Power Electronics 34 Chapter 0: QuasiResonant Converters
35 A quasisquarewave ZVS buck D 1 i V g i v 1 Q 1 L C I R V V 1 V V 1 0 Conducting ω 0 T s devices: Q 1 X D 1 X ω 0 t The basic ZVS QSW switch cell is restricted to 0.5 µ 1 Peak transistor voltage is equal to peak transistor voltage of PWM cell Peak transistor current is increased Zerovoltage switching in all semiconductor devices Fundamentals of Power Electronics 35 Chapter 0: QuasiResonant Converters
36 0.3 Ac modeling of quasiresonant converters Use averaged switch modeling technique: apply averaged PWM model, with d replaced by µ Buck example with fullwave ZCS quasiresonant cell: Fullwave ZCS quasiresonant switch cell µ = F D 1 i r i L i v g v 1 v 1r Q 1 C R v Gate driver Frequency modulator v c Fundamentals of Power Electronics 36 Chapter 0: QuasiResonant Converters
37 Smallsignal ac model Averaged switch equations: Ts = µ v 1r Ts Linearize: = f s I f0 Ts = µ i r Ts Resulting ac model: = F s f 0 v 1r f s V 1 f 0 1 : F i r L v g v 1r f s I f0 f s V 1 f 0 C R v µ = F f s G m (s) v c Fundamentals of Power Electronics 37 Chapter 0: QuasiResonant Converters
38 Lowfrequency model Tank dynamics occur only at frequency near or greater than switching frequency discard tank elements 1 : F L v g f s I f0 f s V 1 f 0 C R v f s G m (s) v c same as PWM buck, with d replaced by F Fundamentals of Power Electronics 38 Chapter 0: QuasiResonant Converters
39 Example : Halfwave ZCS quasiresonant buck Now, µ depends on j s : µ= f s f 0 P1 j s j s =R 0 i r Ts v 1r Ts Halfwave ZCS quasiresonant switch cell D 1 i r i L i v g v 1 v 1r Q 1 C R v Gate driver Frequency modulator v c Fundamentals of Power Electronics 39 Chapter 0: QuasiResonant Converters
40 Smallsignal modeling Perturbation and linearization of µ(v 1r, i r, f s ): with µ=k v v 1r K i i r K c f s K v = µ j s R 0 I V 1 K i = µ j s R 0 V 1 µ j s = F s π f J s J s K c = µ 0 F s Linearized terminal equations of switch network: =µ I i r µ 0 =µ 0 v 1r µ V 1 Fundamentals of Power Electronics 40 Chapter 0: QuasiResonant Converters
41 Equivalent circuit model 1 : µ 0 i r L v g v 1r µ I µ V 1 C R v µ v 1r i r K v K i K c f s G m (s) v c Fundamentals of Power Electronics 41 Chapter 0: QuasiResonant Converters
42 Low frequency model: set tank elements to zero 1 : µ i L 0 µ V g v g µ I C R v µ v g i K v K i K c f s G m (s) v c Fundamentals of Power Electronics 4 Chapter 0: QuasiResonant Converters
43 Predicted smallsignal transfer functions Halfwave ZCS buck G vg (s)=g g Q s ω 0 s ω 0 G vc (s)=g c Q s ω 0 s ω 0 Fullwave: poles and zeroes are same as PWM Halfwave: effective feedback reduces Qfactor and dc gains G g0 = µ 0 K v V g G c0 = ω 0 = Q = 1 K iv g R K c V g 1 K iv g R R 0 1 K iv g R 1 K iv g R R K iv g R R0 R 0 = Fundamentals of Power Electronics 43 Chapter 0: QuasiResonant Converters
44 0.4 Summary of key points 1. In a resonant switch converter, the switch network of a PWM converter is replaced by a switch network containing resonant elements. The resulting hybrid converter combines the properties of the resonant switch network and the parent PWM converter.. Analysis of a resonant switch cell involves determination of the switch conversion ratio µ. The resonant switch waveforms are determined, and are then averaged. The switch conversion ratio µ is a generalization of the PWM CCM duty cycle d. The results of the averaged analysis of PWM converters operating in CCM can be directly adapted to the related resonant switch converter, simply by replacing d with µ. 3. In the zerocurrentswitching quasiresonant switch, diode operates with zerovoltage switching, while transistor Q 1 and diode D 1 operate with zerocurrent switching. Fundamentals of Power Electronics 44 Chapter 0: QuasiResonant Converters
45 Summary of key points 4. In the zerovoltageswitching quasiresonant switch, the transistor Q 1 and diode D 1 operate with zerovoltage switching, while diode operates with zerocurrent switching. 5. Fullwave versions of the quasiresonant switches exhibit very simple control characteristics: the conversion ratio µ is essentially independent of load current. However, these converters exhibit reduced efficiency at light load, due to the large circulating currents. In addition, significant switching loss is incurred due to the recovered charge of diode D Halfwave versions of the quasiresonant switch exhibit conversion ratios that are strongly dependent on the load current. These converters typically operate with wide variations of switching frequency. 7. In the zerovoltageswitching multiresonant switch, all semiconductor devices operate with zerovoltage switching. In consequence, very low switching loss is observed. Fundamentals of Power Electronics 45 Chapter 0: QuasiResonant Converters
46 Summary of key points 8. In the quasisquarewave zerovoltageswitching resonant switches, all semiconductor devices operate with zerovoltage switching, and with peak voltages equal to those of the parent PWM converter. The switch conversion ratio is restricted to the range 0.5 µ The smallsignal ac models of converters containing resonant switches are similar to the smallsignal models of their parent PWM converters. The averaged switch modeling approach can be employed to show that the quantity d is simply replaced by µ. 10.In the case of fullwave quasiresonant switches, µ depends only on the switching frequency, and therefore the transfer function poles and zeroes are identical to those of the parent PWM converter. 11.In the case of halfwave quasiresonant switches, as well as other types of resonant switches, the conversion ratio µ is a strong function of the switch terminal quantities v 1 and i. This leads to effective feedback, which modifies the poles, zeroes, and gains of the transfer functions. Fundamentals of Power Electronics 46 Chapter 0: QuasiResonant Converters
Chapter 19 Resonant Conversion
Chapter 9 Resonant Conversion Introduction 9. Sinusoidal analysis of resonant converters 9. Examples Series resonant converter Parallel resonant converter 9.3 Exact characteristics of the series and parallel
More informationChapter 17 The Ideal Rectifier
Chapter 17 The Ideal Rectifier 17.1 Properties of the ideal rectifier 17.2 Realization of a nearideal rectifier 17.3 Singlephase converter systems employing ideal rectifiers 17.4 RMS values of rectifier
More informationFundamentals of Power Electronics. Robert W. Erickson University of Colorado, Boulder
Robert W. Erickson University of Colorado, Boulder 1 1.1. Introduction to power processing 1.2. Some applications of power electronics 1.3. Elements of power electronics Summary of the course 2 1.1 Introduction
More informationChapter 11 Current Programmed Control
Chapter 11 Current Programmed Control Buck converter v g i s Q 1 D 1 L i L C v R The peak transistor current replaces the duty cycle as the converter control input. Measure switch current R f i s Clock
More informationThe Flyback Converter
The Flyback Converter Lecture notes ECEN4517! Derivation of the flyback converter: a transformerisolated version of the buckboost converter! Typical waveforms, and derivation of M(D) = V/! Flyback transformer
More informationRectifier circuits & DC power supplies
Rectifier circuits & DC power supplies Goal: Generate the DC voltages needed for most electronics starting with the AC power that comes through the power line? 120 V RMS f = 60 Hz T = 1667 ms) = )sin How
More informationThe D.C Power Supply
The D.C Power Supply Voltage Step Down Electrical Isolation Converts Bipolar signal to Unipolar Half or Full wave Smoothes the voltage variation Still has some ripples Reduce ripples Stabilize the output
More informationLecture  4 Diode Rectifier Circuits
Basic Electronics (Module 1 Semiconductor Diodes) Dr. Chitralekha Mahanta Department of Electronics and Communication Engineering Indian Institute of Technology, Guwahati Lecture  4 Diode Rectifier Circuits
More informationChapter 4. LLC Resonant Converter
Chapter 4 LLC Resonant Converter 4.1 Introduction In previous chapters, the trends and technical challenges for front end DC/DC converter were discussed. High power density, high efficiency and high power
More informationThe full wave rectifier consists of two diodes and a resister as shown in Figure
The FullWave Rectifier The full wave rectifier consists of two diodes and a resister as shown in Figure The transformer has a centretapped secondary winding. This secondary winding has a lead attached
More informationSwitch Mode Power Supply Topologies
Switch Mode Power Supply Topologies The Buck Converter 2008 Microchip Technology Incorporated. All Rights Reserved. WebSeminar Title Slide 1 Welcome to this Web seminar on Switch Mode Power Supply Topologies.
More informationDesign and Simulation of Soft Switched Converter Fed DC Servo Drive
International Journal of Soft Computing and Engineering (IJSCE) ISSN: 2231237, Volume1, Issue5, November 211 Design and Simulation of Soft Switched Converter Fed DC Servo Drive Bal Mukund Sharma, A.
More informationPower supplies. EE328 Power Electronics Assoc. Prof. Dr. Mutlu BOZTEPE Ege University, Dept. of E&E
Power supplies EE328 Power Electronics Assoc. Prof. Dr. Mutlu BOZTEPE Ege University, Dept. of E&E EE328 POWER ELECTRONICS Outline of lecture Introduction to power supplies Modelling a power transformer
More informationSoftSwitching in DCDC Converters: Principles, Practical Topologies, Design Techniques, Latest Developments
SoftSwitching in DD onverters: Principles, Practical Topologies, Design Techniques, Latest Developments Raja Ayyanar Arizona State University Ned Mohan University of Minnesota Eric Persson International
More informationDCDC Converter Basics
Page 1 of 16 Free Downloads / Design Tips / Java Calculators / App. Notes / Tutorials / Newsletter / Discussion / Components Database / Library / Power Links / Software / Technical Articles / OnLine Textbook
More informationChapter 9: Controller design
Chapter 9. Controller Design 9.1. Introduction 9.2. Effect of negative feedback on the network transfer functions 9.2.1. Feedback reduces the transfer function from disturbances to the output 9.2.2. Feedback
More informationEMI and t Layout Fundamentals for SwitchedMode Circuits
v sg (t) (t) DT s V pp = n  1 2 V pp V g n V T s t EE core insulation primary return secondary return Supplementary notes on EMI and t Layout Fundamentals for SwitchedMode Circuits secondary primary
More informationDesign Considerations for an LLC Resonant Converter
Design Considerations for an LLC Resonant Converter Hangseok Choi Power Conversion Team www.fairchildsemi.com 1. Introduction Growing demand for higher power density and low profile in power converter
More informationVICOR WHITE PAPER. The Sine Amplitude Converter Topology Provides Superior Efficiency and Power Density in Intermediate Bus Architecture Applications
The Sine Amplitude Converter Topology Provides Superior Efficiency and Power Density in Intermediate Bus Architecture Applications Maurizio Salato, Applications Engineering, Vicor Corporation Contents
More informationSingleStage High Power Factor Flyback for LED Lighting
Application Note Stockton Wu AN012 May 2014 SingleStage High Power Factor Flyback for LED Lighting Abstract The application note illustrates how the singlestage high power factor flyback converter uses
More informationApplication Guide. Power Factor Correction (PFC) Basics
Power Factor Correction (PFC) Basics Introduction Power Factor, in simple terms, is a number between zero and one that represents the ratio of the real power to apparent power. Real power (P), measured
More informationLABORATORY 10 TIME AVERAGES, RMS VALUES AND THE BRIDGE RECTIFIER. Bridge Rectifier
LABORATORY 10 TIME AVERAGES, RMS VALUES AND THE BRIDGE RECTIFIER Fullwave Rectification: Bridge Rectifier For many electronic circuits, DC supply voltages are required but only AC voltages are available.
More informationChapter 6: Converter circuits
Chapter 6. Converter Circuits 6.. Circuit manipulations 6.2. A short list of converters 6.3. Transformer isolation 6.4. Converter evaluation and design 6.5. Summary of key points Where do the boost, buckboost,
More informationDIODE CIRCUITS LABORATORY. Fig. 8.1a Fig 8.1b
DIODE CIRCUITS LABORATORY A solid state diode consists of a junction of either dissimilar semiconductors (pn junction diode) or a metal and a semiconductor (Schottky barrier diode). Regardless of the type,
More informationApplication Note AN 1095
Application Note AN 1095 Design of the Inverter Output Filter for Motor Drives with IRAMS Power Modules Cesare Bocchiola Table of Contents Page Section 1: Introduction...2 Section 2 : Output Filter Design
More informationLet s examine the response of the circuit shown on Figure 1. The form of the source voltage Vs is shown on Figure 2. R. Figure 1.
Examples of Transient and RL Circuits. The Series RLC Circuit Impulse response of Circuit. Let s examine the response of the circuit shown on Figure 1. The form of the source voltage Vs is shown on Figure.
More informationPower Electronic Circuits
Power Electronic Circuits Assoc. Prof. Dr. H. İbrahim OKUMUŞ Karadeniz Technical University Engineering Faculty Department of Electrical And Electronics 1 DC to DC CONVERTER (CHOPPER) General Buck converter
More informationProperties of electrical signals
DC Voltage Component (Average voltage) Properties of electrical signals v(t) = V DC + v ac (t) V DC is the voltage value displayed on a DC voltmeter Triangular waveform DC component Halfwave rectifier
More information3. Diodes and Diode Circuits. 3. Diodes and Diode Circuits TLT8016 Basic Analog Circuits 2005/2006 1
3. Diodes and Diode Circuits 3. Diodes and Diode Circuits TLT8016 Basic Analog Circuits 2005/2006 1 3.1 Diode Characteristics SmallSignal Diodes Diode: a semiconductor device, which conduct the current
More informationCHAPTER 2 POWER AMPLIFIER
CHATER 2 OWER AMLFER 2.0 ntroduction The main characteristics of an amplifier are Linearity, efficiency, output power, and signal gain. n general, there is a trade off between these characteristics. For
More information4. ACTIVECLAMP BOOST AS AN ISOLATED PFC FRONTEND CONVERTER
4. ACTIVECLAMP BOOST AS AN ISOLATED PFC FRONTEND CONVERTER 4.1 Introduction This chapter continues the theme set by Chapter 3  simplifying the standard twostage frontend implementation to one that
More informationCurrent Ripple Factor of a Buck Converter
Application Note Edwin Wang AN1 April 14 Current Ripple Factor of a Buck Converter Abstract Inductor and capacitor forms a lowpass filter in a buck converter. The corner frequency the C filter is always
More informationKeywords: input noise, output noise, step down converters, buck converters, MAX1653EVKit
Maxim > Design Support > Technical Documents > Tutorials > PowerSupply Circuits > APP 986 Keywords: input noise, output noise, step down converters, buck converters, MAX1653EVKit TUTORIAL 986 Input and
More information98% Efficient SingleStage AC/DC Converter Topologies
16 POWER CONVERTERS www.teslaco.com 98% Efficient SingleStage AC/DC Converter Topologies A new Hybrid Switching Method is introduced in this article which for the first time makes possible AC/DC power
More informationTOPOLOGIES FOR SWITCHED MODE POWER SUPPLIES
TOPOLOGIES FOR SWITCHED MODE POWER SUPPLIES by L. Wuidart I INTRODUCTION This paper presents an overview of the most important DCDC converter topologies. The main object is to guide the designer in selecting
More informationDiode Applications. As we have already seen the diode can act as a switch Forward biased or reverse biased  On or Off.
Diode Applications Diode Switching As we have already seen the diode can act as a switch Forward biased or reverse biased  On or Off. Voltage Rectifier A voltage rectifier is a circuit that converts an
More informationANADOLU UNIVERSITY DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING
ANADOLU UNIVERSITY DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING EEM 102 INTRODUCTION TO ELECTRICAL ENGINEERING EXPERIMENT 9: DIODES AND DC POWER SUPPLY OBJECTIVE: To observe how a diode functions
More informationAnalog & Digital Electronics Course No: PH218
Analog & Digital Electronics Course No: PH18 Lec 3: Rectifier and Clipper circuits Course nstructors: Dr. A. P. VAJPEY Department of Physics, ndian nstitute of Technology Guwahati, ndia 1 Rectifier Circuits:
More informationDiode Applications. by Kenneth A. Kuhn Sept. 1, 2008. This note illustrates some common applications of diodes.
by Kenneth A. Kuhn Sept. 1, 2008 This note illustrates some common applications of diodes. Power supply applications A common application for diodes is converting AC to DC. Although halfwave rectification
More informationSelecting IHLP Composite Inductors for NonIsolated Converters Utilizing Vishay s Application Sheet
VISHAY DALE www.vishay.com Magnetics Selecting IHLP Composite Inductors for NonIsolated Converters INTRODUCTION This application note will provide information to assist in the specification of IHLP composite
More informationApplication Report SLVA061
Application Report March 1999 Mixed Signal Products SLVA061 IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product
More informationExperiment 2 Diode Applications: Rectifiers
ECE 3550  Practicum Fall 2007 Experiment 2 Diode Applications: Rectifiers Objectives 1. To investigate the characteristics of halfwave and fullwave rectifier circuits. 2. To recognize the usefulness
More informationDesign and Construction of Variable DC Source for Laboratory Using Solar Energy
International Journal of Electronics and Computer Science Engineering 228 Available Online at www.ijecse.org ISSN 22771956 Design and Construction of Variable DC Source for Laboratory Using Solar Energy
More informationDRIVE CIRCUITS FOR POWER MOSFETs AND IGBTs
DRIVE CIRCUITS FOR POWER MOSFETs AND IGBTs by B. Maurice, L. Wuidart 1. INTRODUCTION Unlike the bipolar transistor, which is current driven, Power MOSFETs, with their insulated gates, are voltage driven.
More informationChapter 3. Diodes and Applications. Introduction [5], [6]
Chapter 3 Diodes and Applications Introduction [5], [6] Diode is the most basic of semiconductor device. It should be noted that the term of diode refers to the basic pn junction diode. All other diode
More informationelectronics fundamentals
electronics fundamentals circuits, devices, and applications THOMAS L. FLOYD DAVID M. BUCHLA Lesson 1: Diodes and Applications CenterTapped Fullwave Rectifier The centertapped (CT) fullwave rectifier
More informationLine Reactors and AC Drives
Line Reactors and AC Drives Rockwell Automation Mequon Wisconsin Quite often, line and load reactors are installed on AC drives without a solid understanding of why or what the positive and negative consequences
More informationApplication Report SLVA057
Application Report March 1999 Mixed Signal Products SLVA057 IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product
More informationLecture 24: Oscillators. Clapp Oscillator. VFO Startup
Whites, EE 322 Lecture 24 Page 1 of 10 Lecture 24: Oscillators. Clapp Oscillator. VFO Startup Oscillators are circuits that produce periodic output voltages, such as sinusoids. They accomplish this feat
More informationHomework Assignment 03
Question 1 (2 points each unless noted otherwise) Homework Assignment 03 1. A 9V dc power supply generates 10 W in a resistor. What peaktopeak amplitude should an ac source have to generate the same
More informationChapter 4 AC to AC Converters ( AC Controllers and Frequency Converters )
Chapter 4 AC to AC Converters ( AC Controllers and Frequency Converters ) Classification of AC to AC converters Same frequency variable magnitude AC power AC controllers AC power Frequency converters (Cycloconverters)
More informationNovel LoadedResonant Converter & Application of DCtoDC Energy Conversions systems
International Refereed Journal of Engineering and Science (IRJES) ISSN (Online) 2319183X, (Print) 23191821 Volume 2, Issue 11 (November 2013), PP.5057 Novel LoadedResonant Converter & Application of
More informationHigh Performance ZVS Buck Regulator Removes Barriers To Increased Power Throughput In Wide Input Range PointOfLoad Applications
White paper High Performance ZVS Buck Regulator Removes Barriers To Increased Power Throughput In Wide Input Range PointOfLoad Applications Written by: C. R. Swartz Principal Engineer, Picor Semiconductor
More informationWelcome to this presentation on Switch Mode Drivers, part of OSRAM Opto Semiconductors LED Fundamentals series. In this presentation we will look at:
Welcome to this presentation on Switch Mode Drivers, part of OSRAM Opto Semiconductors LED Fundamentals series. In this presentation we will look at: How switch mode drivers work, switch mode driver topologies,
More informationFundamentals of Microelectronics
Fundamentals of Microelectronics CH1 Why Microelectronics? CH2 Basic Physics of Semiconductors CH3 Diode Circuits CH4 Physics of Bipolar Transistors CH5 Bipolar Amplifiers CH6 Physics of MOS Transistors
More informationPhysics 623 Transistor Characteristics and Single Transistor Amplifier Sept. 13, 2006
Physics 623 Transistor Characteristics and Single Transistor Amplifier Sept. 13, 2006 1 Purpose To measure and understand the common emitter transistor characteristic curves. To use the base current gain
More informationPower Supplies. 1.0 Power Supply Basics. www.learnaboutelectronics.org. Module
Module 1 www.learnaboutelectronics.org Power Supplies 1.0 Power Supply Basics What you ll learn in Module 1 Section 1.0 Power Supply Basics. Basic functions of a power supply. Safety aspects of working
More informationChapter 2 MENJANA MINDA KREATIF DAN INOVATIF
Chapter 2 DIODE part 2 MENJANA MINDA KREATIF DAN INOATIF objectives Diode with DC supply circuit analysis serial & parallel Diode d applications the DC power supply & Clipper Analysis & Design of rectifier
More informationUNDERSTANDING POWER FACTOR AND INPUT CURRENT HARMONICS IN SWITCHED MODE POWER SUPPLIES
UNDERSTANDING POWER FACTOR AND INPUT CURRENT HARMONICS IN SWITCHED MODE POWER SUPPLIES WHITE PAPER: TW0062 36 Newburgh Road Hackettstown, NJ 07840 Feb 2009 Alan Gobbi About the Author Alan Gobbi Alan Gobbi
More informationCapacitor Ripple Current Improvements
Capacitor Ripple Current Improvements The multiphase buck regulator topology allows a reduction in the size of the input and put capacitors versus singlephase designs. By quantifying the input and put
More informationUsing the Impedance Method
Using the Impedance Method The impedance method allows us to completely eliminate the differential equation approach for the determination of the response of circuits. In fact the impedance method even
More informationAN ULTRACHEAP GRID CONNECTED INVERTER FOR SMALL SCALE GRID CONNECTION
AN ULTRACHEAP GRID CONNECTED INVERTER FOR SMALL SCALE GRID CONNECTION Pramod Ghimire 1, Dr. Alan R. Wood 2 1 ME Candidate Email: pgh56@student.canterbury.ac.nz 2 Senior Lecturer: Canterbury University
More informationCircuits with inductors and alternating currents. Chapter 20 #45, 46, 47, 49
Circuits with inductors and alternating currents Chapter 20 #45, 46, 47, 49 RL circuits Ch. 20 (last section) Symbol for inductor looks like a spring. An inductor is a circuit element that has a large
More informationIntroduction to Power Supplies
Introduction to Power Supplies INTRODUCTION Virtually every piece of electronic equipment e g computers and their peripherals calculators TV and hifi equipment and instruments is powered from a DC power
More informationBASIC ELECTRONICS AC CIRCUIT ANALYSIS. December 2011
AM 5202 BASIC ELECTRONICS AC CIRCUIT ANALYSIS December 2011 DISTRIBUTION RESTRICTION: Approved for Pubic Release. Distribution is unlimited. DEPARTMENT OF THE ARMY MILITARY AUXILIARY RADIO SYSTEM FORT
More informationTransistor Characteristics and Single Transistor Amplifier Sept. 8, 1997
Physics 623 Transistor Characteristics and Single Transistor Amplifier Sept. 8, 1997 1 Purpose To measure and understand the common emitter transistor characteristic curves. To use the base current gain
More informationSemiconductor Diode. It has already been discussed in the previous chapter that a pn junction conducts current easily. Principles of Electronics
76 6 Principles of Electronics Semiconductor Diode 6.1 Semiconductor Diode 6.3 Resistance of Crystal Diode 6.5 Crystal Diode Equivalent Circuits 6.7 Crystal Diode Rectifiers 6.9 Output Frequency of HalfWave
More informationULRASONIC GENERATOR POWER CIRCUITRY. Will it fit on PC board
ULRASONIC GENERATOR POWER CIRCUITRY Will it fit on PC board MAJOR COMPONENTS HIGH POWER FACTOR RECTIFIER RECTIFIES POWER LINE RAIL SUPPLY SETS VOLTAGE AMPLITUDE INVERTER INVERTS RAIL VOLTAGE FILTER FILTERS
More informationLecture 22: Class C Power Amplifiers
Whites, EE 322 Lecture 22 Page 1 of 13 Lecture 22: lass Power Amplifiers We discovered in Lecture 18 (Section 9.2) that the maximum efficiency of lass A amplifiers is 25% with a resistive load and 50%
More informationRLC Resonant Circuits
C esonant Circuits Andrew McHutchon April 20, 203 Capacitors and Inductors There is a lot of inconsistency when it comes to dealing with reactances of complex components. The format followed in this document
More informationPOWER SYSTEM HARMONICS. A Reference Guide to Causes, Effects and Corrective Measures AN ALLENBRADLEY SERIES OF ISSUES AND ANSWERS
A Reference Guide to Causes, Effects and Corrective Measures AN ALLENBRADLEY SERIES OF ISSUES AND ANSWERS By: Robert G. Ellis, P. Eng., Rockwell Automation Medium Voltage Business CONTENTS INTRODUCTION...
More informationDesign A High Performance Buck or Boost Converter With Si9165
Design A High Performance Buck or Boost Converter With Si9165 AN723 AN723 by Kin Shum INTRODUCTION The Si9165 is a controller IC designed for dctodc conversion applications with 2.7 to 6 input voltage.
More information12.4 UNDRIVEN, PARALLEL RLC CIRCUIT*
+ v C C R L  v i L FIGURE 12.24 The parallel secondorder RLC circuit shown in Figure 2.14a. 12.4 UNDRIVEN, PARALLEL RLC CIRCUIT* We will now analyze the undriven parallel RLC circuit shown in Figure
More informationNoise Free 90+ for LCD TV AC Adapter Desk Top. 96% x 96% = 92.16% Champion Microelectronic. 96+ Interleaved CRM PFC CM6565 PFC & PFC PWM PWM
Soft Soft Switching Switching PFC PFC & & Soft Soft Switching Switching PWM PWM 96% x 96% = 92.16% Noise Free 90+ for LCD TV AC Adapter Desk Top 1 96% x 96% = 92.16% 96+ LLC/SRC + SR CM6900/1 92% x 96%
More informationLM 358 Op Amp. If you have small signals and need a more useful reading we could amplify it using the op amp, this is commonly used in sensors.
LM 358 Op Amp S k i l l L e v e l : I n t e r m e d i a t e OVERVIEW The LM 358 is a duel single supply operational amplifier. As it is a single supply it eliminates the need for a duel power supply, thus
More informationA ZeroVoltage Switching TwoInductor Boost Converter With an Auxiliary Transformer
A ZeroVoltage Switching TwoInductor Boost Converter With an Auxiliary Transformer Quan Li and Peter Wolfs Central Queensland University Rockhampton Mail Center, QLD 47, Australia AbstractThe twoinductor
More informationCancellation of LoadRegulation in Low DropOut Regulators
Cancellation of LoadRegulation in Low DropOut Regulators Rajeev K. Dokania, Student Member, IEE and Gabriel A. RincόnMora, Senior Member, IEEE Georgia Tech Analog Consortium Georgia Institute of Technology
More informationCIRCUITS LABORATORY EXPERIMENT 3. AC Circuit Analysis
CIRCUITS LABORATORY EXPERIMENT 3 AC Circuit Analysis 3.1 Introduction The steadystate behavior of circuits energized by sinusoidal sources is an important area of study for several reasons. First, the
More informationInrush Current. Although the concepts stated are universal, this application note was written specifically for Interpoint products.
INTERPOINT Although the concepts stated are universal, this application note was written specifically for Interpoint products. In today s applications, high surge currents coming from the dc bus are a
More information741 POWER FACTOR CORRECTION
POWER FTOR CORRECTION INTRODUCTION Modern electronic equipment can create noise that will cause problems with other equipment on the same supply system. To reduce system disturbances it is therefore essential
More informationThreeport DCDC Converters to Interface Renewable Energy Sources with Bidirectional Load and Energy Storage Ports
Threeport DCDC Converters to Interface Renewable Energy Sources with Bidirectional Load and Energy Storage Ports A DISSERTATION SUBMITTED TO THE FACULTY OF THE GRADUATE SCHOOL OF THE UNIVERSITY OF MINNESOTA
More informationTopic 5. An Interleaved PFC Preregulator for HighPower Converters
Topic 5 An nterleaved PFC Preregulator for HighPower Converters An nterleaving PFC PreRegulator for HighPower Converters Michael O Loughlin, Texas nstruments ABSTRACT n higher power applications, to
More informationInput and Output Capacitor Selection
Application Report SLTA055 FEBRUARY 2006 Input and Output Capacitor Selection Jason Arrigo... PMP PlugIn Power ABSTRACT When designing with switching regulators, application requirements determine how
More informationCHAPTER 2B: DIODE AND APPLICATIONS. D.Wilcher
CHAPTER 2B: DIODE AND APPLICATIONS D.Wilcher 1 CHAPTER 2B: OBJECTIVES Analyze the operation of 3 basic types of rectifiers Describe the operation of rectifier filters and IC regulators Analyze the operation
More informationBode Diagrams of Transfer Functions and Impedances ECEN 2260 Supplementary Notes R. W. Erickson
Bode Diagrams of Transfer Functions and Impedances ECEN 2260 Supplementary Notes. W. Erickson In the design of a signal processing network, control system, or other analog system, it is usually necessary
More informationPrecision Diode Rectifiers
by Kenneth A. Kuhn March 21, 2013 Precision halfwave rectifiers An operational amplifier can be used to linearize a nonlinear function such as the transfer function of a semiconductor diode. The classic
More informationSIMULATION OF CLOSED LOOP CONTROLLED BRIDGELESS PFC BOOST CONVERTER
SIMULATION OF CLOSED LOOP CONTROLLED BRIDGELESS PFC BOOST CONVERTER 1M.Gopinath, 2S.Ramareddy Research Scholar, Bharath University, Chennai, India. Professor, Jerusalem college of Engg Chennai, India.
More informationPositive Feedback and Oscillators
Physics 3330 Experiment #6 Fall 1999 Positive Feedback and Oscillators Purpose In this experiment we will study how spontaneous oscillations may be caused by positive feedback. You will construct an active
More informationEDEXCEL NATIONAL CERTIFICATE/DIPLOMA UNIT 5  ELECTRICAL AND ELECTRONIC PRINCIPLES NQF LEVEL 3 OUTCOME 4  ALTERNATING CURRENT
EDEXCEL NATIONAL CERTIFICATE/DIPLOMA UNIT 5  ELECTRICAL AND ELECTRONIC PRINCIPLES NQF LEVEL 3 OUTCOME 4  ALTERNATING CURRENT 4 Understand singlephase alternating current (ac) theory Single phase AC
More informationChapter 11. Inductors ISU EE. C.Y. Lee
Chapter 11 Inductors Objectives Describe the basic structure and characteristics of an inductor Discuss various types of inductors Analyze series inductors Analyze parallel inductors Analyze inductive
More informationAC/DC Power Supply Reference Design. Advanced SMPS Applications using the dspic DSC SMPS Family
AC/DC Power Supply Reference Design Advanced SMPS Applications using the dspic DSC SMPS Family dspic30f SMPS Family Excellent for Digital Power Conversion Internal hires PWM Internal high speed ADC Internal
More informationDevelopment of High Frequency Link Direct DC to AC Converters for Solid Oxide Fuel Cells (SOFC)
Development of High Frequency Link Direct DC to AC Converters for Solid Oxide Fuel Cells (SOFC) Dr. Prasad Enjeti Power Electronics Laboratory Department of Electrical Engineering College Station, TX 
More information= V peak 2 = 0.707V peak
BASIC ELECTRONICS  RECTIFICATION AND FILTERING PURPOSE Suppose that you wanted to build a simple DC electronic power supply, which operated off of an AC input (e.g., something you might plug into a standard
More informationChapter 12 Driven RLC Circuits
hapter Driven ircuits. A Sources... . A ircuits with a Source and One ircuit Element... 3.. Purely esistive oad... 3.. Purely Inductive oad... 6..3 Purely apacitive oad... 8.3 The Series ircuit...
More informationBoundary between CCM and DCM in DC/DC PWM Converters
Boundary between CCM and DCM in DC/DC PWM Converters ELENA NICULESCU and E. P. IANCU Dept. of Electronics and Instrumentation, and Automation University of Craiova ROMANIA Abstract:  It is presented a
More informationLOW COST MOTOR PROTECTION FILTERS FOR PWM DRIVE APPLICATIONS STOPS MOTOR DAMAGE
LOW COST MOTOR PROTECTION FILTERS FOR PWM DRIVE APPLICATIONS STOPS MOTOR DAMAGE Karl M. Hink, Executive Vice President Originally presented at the Power Quality 99 Conference ABSTRACT Motor protection
More informationA bidirectional DCDC converter for renewable energy systems
BULLETIN OF THE POLISH ACADEMY OF SCIENCES TECHNICAL SCIENCES Vol. 57, No. 4, 2009 A bidirectional DCDC converter for renewable energy systems S. JALBRZYKOWSKI, and T. CITKO Faculty of Electrical Engineering,
More informationDesigning Stable Compensation Networks for Single Phase Voltage Mode Buck Regulators
Designing Stable Compensation Networks for Single Phase Voltage Mode Buck Regulators Technical Brief December 3 TB47. Author: Doug Mattingly Assumptions This Technical Brief makes the following assumptions:.
More informationUnit/Standard Number. High School Graduation Years 2010, 2011 and 2012
1 Secondary Task List 100 SAFETY 101 Demonstrate an understanding of State and School safety regulations. 102 Practice safety techniques for electronics work. 103 Demonstrate an understanding of proper
More informationTransformerless UPS systems and the 9900 By: John Steele, EIT Engineering Manager
Transformerless UPS systems and the 9900 By: John Steele, EIT Engineering Manager Introduction There is a growing trend in the UPS industry to create a highly efficient, more lightweight and smaller UPS
More information