Patent ID: 7990745
Filing Date: 2011-08-02
Classification: H02M,Y02B

Abstract:
1. A voltage feed-forward compensation apparatus, comprising: a first proportional-integral regulator, for receiving a DC current; a second proportional-integral regulator, coupled to the first proportional-integral regulator, for receiving a first signal comprising the DC current and a AC current; a buck-mode modulation index calculator, for receiving an input voltage and generating an input voltage feed-forward compensation parameter; a boost-mode modulation index calculator, for receiving an output voltage and generating an output voltage feed-forward compensation parameter; a first comparator, having a positive terminal and a negative terminal, and receiving a mixed signal and a first high-frequency triangular wave and generating a output signal to control gate of a first active switching element, wherein the positive terminal of the first comparator is configured to receive the mixed signal comprising a second signal from the second proportional-integral regulator and the input voltage feed-forward compensation parameter/the output voltage feed-forward compensation parameter, and the negative thereof is configured to receive the first high-frequency triangular wave; a second comparator, having a positive terminal and a negative terminal, and receiving the mixed signal and a first high-frequency triangular wave and generating a output signal to control gate of a second active switching element, wherein the positive terminal of the second comparator is configured to receive the mixed signal comprising the second signal from the second proportional-integral regulator and the input voltage feed-forward compensation parameter/the output voltage feed-forward compensation parameter, and the negative thereof is configured to receive the first high-frequency triangular wave; and a third comparator, having a positive terminal and a negative terminal, and receiving the output voltage and generating a output signal to control a third active switching element and the sixth active switching element, wherein the positive terminal of the third comparator is configured to receive the input voltage and the negative terminal therefore is connected to ground; wherein the output signal from the third comparator is introduced into a NOT gate to control the gates of a fourth active switching element and a fifth active switching element.