Constant voltage constant current controller and control method thereof

Patent metadata

Field	Value
Publication number	US-9130468-B2
Application number	US-201414533311-A
Country	US
Kind code	B2
Filing date	Nov 5, 2014
Priority date	Feb 28, 2012
Publication date	Sep 8, 2015
Grant date	Sep 8, 2015

Abstract

The present invention relates to a constant voltage constant current (CVCC) controller, and associated control methods. In one embodiment, a CVCC controller for a flyback converter can include: (i) a current controller configured to generate an error signal by comparing an output current feedback signal against a reference current; (ii) a voltage controller configured to receive an output voltage feedback signal and a reference voltage, and to generate a control signal; (iii) a selector configured to control the flyback converter to operate in a first or a second operation mode based on the control signal, and to further generate a constant voltage or a constant current control signal based on the error signal; and (iv) a pulse-width modulation (PWM) controller configured to generate a PWM control signal to control a main switch, and to maintain the output voltage and/or current of the flyback converter as substantially constant.

First claim

What is claimed is:

1. A constant voltage constant current (CVCC) controller configured for a flyback converter, said CVCC controller comprising:
a) a current controller configured to generate an error signal by calculating a difference between an output current feedback signal from a current feedback circuit and a reference current;
b) a voltage controller configured to receive an output voltage feedback signal from a voltage feedback circuit and a reference voltage, and to gen…

Assignees

• Silergy Semiconductor Technology Hangzhou Ltd

Inventors

• Xu Xiaoru

Classifications

• H02M3/335

  Electricity · mapped topic

• H02M3/33507 Primary

  Electricity · mapped topic