Title:
PFC OVERCURRENT PROTECTION CIRCUIT, AND CONTROLLER
Document Type and Number:
WIPO Patent Application WO/2020/063652
Kind Code:
A1
Abstract:
The present application provides an overcurrent protection circuit and a controller. The overcurrent protection circuit comprises a sampling circuit, a comparator circuit, a D flip-flop, and an output signal control circuit. The sampling circuit samples a current of a branch circuit being controlled, obtains a sample signal, and outputs the sample signal to the comparator circuit. The comparator circuit compares the sample signal against a reference signal, generates an overcurrent signal if the sample signal is greater than the reference signal, and outputs the overcurrent signal to the D flip-flop. The D flip-flop receives the overcurrent signal, generates a first voltage level signal according to the overcurrent signal, and outputs the first voltage level signal to the output signal control circuit. The output signal control circuit receives the first voltage level signal, and outputs, in response to the first voltage level signal, a control signal for reducing the current of the branch circuit under control. The circuit achieves fast overcurrent protection by means of the D flip-flop, thereby improving protection reliability.
Inventors:
LV YONGSONG (CN)
WANG QI (CN)
WANG QI (CN)
Application Number:
PCT/CN2019/107772
Publication Date:
April 02, 2020
Filing Date:
September 25, 2019
Export Citation:
Assignee:
HANGZHOU LEADERWAY ELECTRONICS CO LTD (CN)
International Classes:
H02H3/087; H02H3/06
Foreign References:
| CN109301796A | 2019-02-01 | |||
| CN104218530A | 2014-12-17 | |||
| CN106486963A | 2017-03-08 | |||
| CN101902122A | 2010-12-01 | |||
| CN201811144713A | 2018-09-29 |
Other References:
See also references of EP 3879655A4
Attorney, Agent or Firm:
UNITALEN ATTORNEYS AT LAW (CN)
Download PDF: