PSPICE SIMULATION OF BIPOLAR SWITCHING PWM INVERTER
10:48:00
AIM:
To simulate the bipolar switching PWM inverter and study the performance with an RL load.
PRINCIPLE:
PWM inverter works with bipolar or unipolar switching.In bipolar switching output varies from –V to +V as shown,where as in unipolar switching the output varies from –V to zero and +V to zero.The switching signals are generated waveforms(carrier frequency) with sinusoidal wave.The carrier frequency is set about 1KHz for clarifying the waveforms in PSPICE SIMULATION.In practice carrier frequency is in range of 10-20khz will be used.
MOSFET’s M1 and M3 conduct ,when switching pulses are +ve producing Vo=V, the input DC voltage.M2 and M4 conduct when switching pulses are –ve producing –Vo=V.
The Scheme employed for getting appropriate switching pulses and output voltage is shown in fig.OP-AMP 1 acts as a comparator and OP-AMP2 acts as an inverter
The output will be a pulse waveform which contains desired output waveform in the fourier series along with harmonic frequency components.The lowest switching frequency contents (other than 50Hz ) in around carrier frequency.The desired output can be extracted by using a LC low pass filter as shown.Since output voltage in bipolar PWM inverter changes from –v to +v.Switching harmonic current in this scheme is made.Hence it is difficult to achieve good zero crossing which can be avoided by using unipolar switching scheme .
PROCEDURE
Using PSPICE software circuit diagram for bipolar switching PWM inverter was constructed with help of tools.Value for voltage pulses are given and suitable scale is set up.then it is simulated and verified.
RESULT:
Simulation of bipolar PWM inverter was done and its performance with RL Load was determined.
parameters
vsin
VAMPL=4
FREQ=50
TD=0
DF=0
DC=0
AC=0
PHASE=0
VPULSE
DC=0
AC=0
V1=-5
V2=5
TD=0ms
TR=.5ms
TF=.5ms
PW=1ns
PER=1ms
circuit diagram
output waveform
click here to download sch format file
you can download the pspice work(.sch) from the above links
AIM:
To simulate the bipolar switching PWM inverter and study the performance with an RL load.
PRINCIPLE:
PWM inverter works with bipolar or unipolar switching.In bipolar switching output varies from –V to +V as shown,where as in unipolar switching the output varies from –V to zero and +V to zero.The switching signals are generated waveforms(carrier frequency) with sinusoidal wave.The carrier frequency is set about 1KHz for clarifying the waveforms in PSPICE SIMULATION.In practice carrier frequency is in range of 10-20khz will be used.
MOSFET’s M1 and M3 conduct ,when switching pulses are +ve producing Vo=V, the input DC voltage.M2 and M4 conduct when switching pulses are –ve producing –Vo=V.
The Scheme employed for getting appropriate switching pulses and output voltage is shown in fig.OP-AMP 1 acts as a comparator and OP-AMP2 acts as an inverter
The output will be a pulse waveform which contains desired output waveform in the fourier series along with harmonic frequency components.The lowest switching frequency contents (other than 50Hz ) in around carrier frequency.The desired output can be extracted by using a LC low pass filter as shown.Since output voltage in bipolar PWM inverter changes from –v to +v.Switching harmonic current in this scheme is made.Hence it is difficult to achieve good zero crossing which can be avoided by using unipolar switching scheme .
PROCEDURE
Using PSPICE software circuit diagram for bipolar switching PWM inverter was constructed with help of tools.Value for voltage pulses are given and suitable scale is set up.then it is simulated and verified.
RESULT:
Simulation of bipolar PWM inverter was done and its performance with RL Load was determined.
parameters
vsin
VAMPL=4
FREQ=50
TD=0
DF=0
DC=0
AC=0
PHASE=0
VPULSE
DC=0
AC=0
V1=-5
V2=5
TD=0ms
TR=.5ms
TF=.5ms
PW=1ns
PER=1ms
circuit diagram
 |
| fig1: circuit diagram |
 |
| output wavefrom |
click here to download sch format file
you can download the pspice work(.sch) from the above links
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