To achieve a zero steady state error, the voltage-controller transfer function s

Question

To achieve a zero steady state error, the voltage-controller transfer function should have a pole at the origin. However, the voltage controller for the PFC circuit discussed in the class don't utilize that pole for the following reason:

a) Otherwise, the control loop will try to correct the 2nd harmonic in the output voltage, thus resulting in a 3rd harmonic

b) For controller stability reasons in the PFC circuit

c) The PFC circuit is not a strict regulator

d) None of the above, the answer is_________________.

Explanation / Answer

c) The PFC circuit is not a strict regulator

because it operates in two modes of operations.

1. continous mode of operation.

2.discontinous mode of operation.

Discontinuous mode is when the boost converter’s MOSFET is turned on when the inductor current reaches zero, and turned off when the inductor current meets the desired input reference voltage.

so PFC CIRCUIT IS NOT A STRICT REGULATOR.

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