公开(公告)号：US20150207311A1

公开(公告)日：2015-07-23

申请号：US14599554

申请日：2015-01-19

Applicant: Leadtrend Technology Corp.

Inventor： Chih-Chi Chang ,  Da-Chun Wei ,  Ming-Chang Tsou ,  Meng-Jen Tsai

IPC: H02H7/10 ,  H02H5/04 ,  H02H3/20

CPC classification number: H02H5/042 ,  H02H3/20 ,  H02H7/1213

Abstract: A control circuit applied to a power converter includes a multi-functional pin, a zero-crossing signal generator, and an over-voltage detector. The multi-functional pin is used for receiving an auxiliary current generated by an auxiliary winding of the power converter, and an input current. The zero-crossing signal generator is used for generating a zero-crossing signal according to the auxiliary current. The over-voltage detector is used for generating an over-voltage signal according to the auxiliary current. The control circuit generates a switch control signal to the power switch according to the zero-crossing signal, or generates an over-voltage protection signal to the power switch according to the over-voltage signal.

Abstract translation: 应用于功率转换器的控制电路包括多功能引脚，过零信号发生器和过电压检测器。 多功能引脚用于接收由功率转换器的辅助绕组产生的辅助电流和输入电流。 过零信号发生器用于根据辅助电流产生过零信号。 过电压检测器用于根据辅助电流产生过电压信号。 控制电路根据过零信号向电源开关产生开关控制信号，或根据过电压信号向电源开关产生过电压保护信号。

公开(公告)号：US09755421B2

公开(公告)日：2017-09-05

申请号：US14599554

申请日：2015-01-19

Applicant: Leadtrend Technology Corp.

Inventor： Chih-Chi Chang ,  Da-Chun Wei ,  Ming-Chang Tsou ,  Meng-Jen Tsai

IPC: H02H7/10 ,  H02H3/20 ,  H02H5/04 ,  H02H7/12

CPC classification number: H02H5/042 ,  H02H3/20 ,  H02H7/1213

Abstract: A control circuit applied to a power converter includes a multi-functional pin, a zero-crossing signal generator, and an over-voltage detector. The multi-functional pin is used for receiving an auxiliary current generated by an auxiliary winding of the power converter, and an input current. The zero-crossing signal generator is used for generating a zero-crossing signal according to the auxiliary current. The over-voltage detector is used for generating an over-voltage signal according to the auxiliary current. The control circuit generates a switch control signal to the power switch according to the zero-crossing signal, or generates an over-voltage protection signal to the power switch according to the over-voltage signal.