# Chapter 11. Capacitors Charging, Discharging, Simple Waveshaping Circuits

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1 Chapter 11 Capacitors Charging, Discharging, Simple Waveshaping Circuits Source: Circuit Analysis: Theory and Practice Delmar Cengage Learning Introduction When switch is closed at, capacitor charging When switch is closed at, capacitor discharging Transient voltages and currents result when circuit is switched 2 1

2 Capacitor Charging When switch is closed at, beginning state Capacitor voltage cannot change instantaneously When switching, the capacitor looks like a short circuit Capacitor voltage begins at zero Capacitor current instantaneously jumps to E /R 3 Capacitor Charging When switch is closed at, transient state Capacitor voltage begins at zero and exponentially increases to E volts Capacitor current instantaneously jumps to E /R and exponentially decays to zero 4 2

3 Capacitor Charging Process 10 10V t=0s, v c = 0V, i c = (E - v c )/10 = (10-0)/10 = 1A t=1s, v c = 6.3V, i c = (E - v c )/10 = (10 6.3)/10 = 0.37A t=3s, v c = 9.5V, i c = (E - v c )/10 = (10 9.5)/10 = 0.05A t=5s, v c = 10V, i c = (E - v c )/10 = (10 10)/10 = 0A t=6s, v c = 10V, i c = (E - v c )/10 = (10 10)/10 = 0A 5 Steady State Conditions When switch is closed at, steady state Capacitor voltage and current reach their final values and stop changing Capacitor has voltage across it, but no current flows through the circuit. Capacitor looks like an open circuit. 6 3

4 Capacitor Discharging When switch is closed at, beginning state Capacitor voltage has E volts across it when it begins to discharge Capacitor current will instantly jump to E /R Both voltage and current will decay exponentially to zero E 7 Capacitor Discharging Process 10 10V E 10V t=0s, v c = 10V, i c = -(v c )/10 = -(10)/10 = -1A t=1s, v c = 3.7V, i c = -(v c )/10 = -(3.3)/10 = -0.37A t=3s, v c = 0.5V, i c = -(v c )/10 = -(0.5)/10 = -0.05A t=5s, v c = 0V, i c = -(v c )/10 = (0)/10 = 0A t=6s, v c = 0V, i c = -(v c )/10 = (0)/10 = 0A 8 4

5 Example: Capacitor Charging/Discharge 9 Capacitor Charging Equations Voltages and currents in a charging circuit do not change instantaneously These changes over time are exponential changes The voltage across the capacitor as a function of time is t / RC vc E (1 e ) The current through the capacitor as a function of time is t / RC ic e E R 10 5

6 Capacitor Charging Equations 11 The Time Constant Rate at which a capacitor charges depends on product of R and C Product known as time constant, = RC (Greek letter tau) has units of seconds Length of time that a transient lasts depends on exponential function e -t/. As t increases, the function decreases. When the t reaches infinity, the function decays to zero For all practical purposes, transients can be considered to last for only five time constants 12 6

7 Exponential Functions 13 The Time Constant The functions e -t/ and 1-e -t/ v C E (1 e t / RC ) t =0RC=0, e -0 = 1, E (1-e -0 )= 0 t =1RC=1, e -1 = 0.368, E (1-e -1 )= E t =2RC=2, e -2 = 0.135, E (1-e -2 )= E t =3RC=3, e -3 = 0.050, E (1-e -3 )= E t =4RC=4, e -4 = 0.018, E (1-e -4 )= E t 5RC=5, e -5 = 0.007, E (1-e -5 )= E 14 7

8 v C E (1 e t / RC ) i C E R e t / RC 15 The Time Constant 16 8

9 Example1: Capacitor Charging A RC circuit with E=100V, R=10K, and C=10 F 17 Example2: Capacitor Charging 18 9

10 Capacitor with an Initial Voltage Voltage denoted as V 0 Capacitor has a voltage on it Voltage and current in a circuit will be affected by initial voltage V 0 v i C C E E V R V 0 0 e E t / e t / 19 Example: Capacitor with an Initial Voltage V 0 =25V 20 10

11 Capacitor Discharging Equations If a capacitor is charged to voltage V 0 and then discharged. Current is negative because it flows opposite to reference direction Discharge transients last five time constants All voltages and currents are at zero when capacitor has fully discharged t / vc V0e v i C R V e 0 V0 R t / e t / 21 Capacitor Discharge Equations 22 11

12 Example: Capacitor Discharge A RC circuit with R=5K and C=25 F, assume that C has charged to 100V. Determine the discharge voltage and current. 23 More Complex Circuits Remove capacitor as the load and determine Thévenin equivalent circuit Use R Th to determine, = R Th C Use E Th as the equivalent source voltage 24 12

13 Example: More Complex Circuits 25 Example: More Complex Circuits The switch is closed at for 5ms then closed at for 10ms

14 Example: More Complex Circuits The capacitor takes 1.75ms to discharge as shown the waveform. Determine E, R 1, and C. 27 An RC Timing Applications RC circuits are used to create delays for alarm, motor control, and timing applications Alarm unit shown contains a threshold detector When input to this detector exceeds a preset value, the alarm is turned on 28 14

15 Pulse Response of RC Circuits Pulse: Voltage or current that changes from one level to another and back again Periodic waveform: Pulse train is a repetitive stream of pulses Square wave: Waveform s time high equals its time low Frequency: Number of pulses per second Duty cycle: Width of pulse compared to its period 29 Pulse Response of RC Circuits Pulses have a rise and fall time Because they do not rise and fall instantaneously Rise and fall times are measured between the 10% and 90% points 30 15

16 The Effect of Pulse Width If pulse width t p >> 5 Capacitor charges and discharges fully This is a differentiator circuit If pulse width t p = 5 Capacitor fully charges and discharges during each pulse If the pulse width t p << 5 Capacitor cannot fully charge and discharge This is an integrator circuit 31 Simple Waveshaping Circuits T >> 5 T <<

17 T << 5 Simple Waveshaping Circuits 33 Capacitive Loading In high-speed circuits, the capacitance can cause problems 34 17

18 Transient Analysis Using Computers 35 Transient Analysis Using Multisim 36 18

19 Problem: Draw the V c waveform 37 Problem: Draw the V c waveform after closing the switch for 15ms and opening the switch

20 Problem: Draw the V out waveform if (a) R=2K and C=0.1 F and (b) R=20K and C=1 F. 39 Problem: If Vc= 4.75V the alarm will be on, how long is required when the switch is closed to 5V

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