US 2015/0085537 A1 · CONTROL METHOD, POWER CONVERTING CIRCUIT AND AC-DC POWER CONVERTER USING THE SAME

Abstract

In one embodiment, a method of controlling an AC-DC power converter, can include: (i) receiving, by a filter capacitor, a first branch current from an input current of the AC-DC power converter; (ii) receiving, by a power converting circuit, a second branch current from the input current; (iii) receiving, by the power converting circuit, a feedback signal that represents an output signal of the power converting circuit, and a triangular wave signal that is determined by the first branch current; (iv) generating a first conduction time based on the feedback signal such that the power converting circuit produces a first converting current; and (v) generating a second conduction time based on the triangular wave signal such that the power converting circuit produces a second converting current having a same absolute value as the first branch current.

Claims9

Dependent claims

A method of controlling an AC-DC power converter, the method comprising:

a) receiving, by a filter capacitor, a first branch current from an input current of said AC-DC power converter;
b) receiving, by a power converting circuit, a second branch current from said input current;
c) receiving, by said power converting circuit, a feedback signal that represents an output signal of said power converting circuit, and a triangular wave signal that is determined by said first branch current;
d) generating a first conduction time based on said feedback signal such that said power converting circuit produces a first converting current;
and
e) generating a second conduction time based on said triangular wave signal such that said power converting circuit produces a second converting current having a same absolute value as said first branch current, wherein said second branch current comprises a sum of said first and second converting currents, and a power converting circuit conduction time comprises a sum of said first and second conduction times.

3 more elements

An AC-DC power converter, comprising:

a) a filter capacitor configured to receive a first branch current from an input current of said AC-DC power converter;
b) a power converting circuit configured to receive a second branch current from said input current;
c) a compensating circuit configured to generate a first compensation signal by compensation of an error between a feedback signal that represents an output signal of said power converting circuit and a first reference voltage that represents a desired output value of said output signal;
d) a superposition circuit configured to generate a second compensation signal by adding said first compensation signal with said triangular wave signal from a triangular wave signal generating circuit;
e) a driving control circuit configured to generate a control signal to control a power switching device of said power converting circuit based on said second compensation signal;
and
f) said power converting circuit being configured to produce a first converting current by a first conduction time that is generated based on said feedback signal, and a second converting current having a same absolute value as said first branch current by a second conduction time based on said triangular wave signal, wherein said second branch current comprises a sum of said first and second converting currents, and a power converting circuit conduction time comprises a sum of said first and second conduction times.

4 more elements

Dependencies are inferred from the claim text.

Control method, power converting circuit and ac-dc power converter using the same

Life of this patent

Control method, power converting circuit and ac-dc power converter using the same

Life of this patent

Abstract

Claims9