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working principle of pwm rectifier for a cycle

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sanjaykumar

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I just want to know the working principle of single phase pwm rectifier with its waveform for a cycle??
 

What kind of circuit do you mean,

- two-quadrant buck or boost PFC?
- four-quadrant active front end?
 

The waveforms are basically the same as in a DC/AC inverter, means the low-pass filtered output of the H-bridge is a sine voltage, almost equal to the mains voltage. By making the voltage slightly lower than the mains voltage, a sinusoidal current with energy flow towards the AFE is generated. A series inductor is reducing the pwm frequent current, possibly with the help of an additional LC filter.

The H-bridge is usually operated in a 3-level pwm scheme.
 

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