公开(公告)号：EP3245851A1

公开(公告)日：2017-11-22

申请号：EP16737054.3

申请日：2016-01-08

申请人： Sengled Optoelectronics Co., Ltd.

发明人： WANG, Zhonghua ,  YU, Haiyang ,  LOU, Junshan ,  SHEN, Jinxiang

IPC分类号： H05B37/02

CPC分类号： H05B33/0815 ,  H02M1/36 ,  H05B33/0887 ,  H05B33/089 ,  Y02B20/341

摘要： The present disclosure provides a silicon-controlled rectifier (SCR)-compatible constant-voltage circuit. The circuit includes an input undervoltage control module, an overpower protection module, a controllable load module, and a power conversion module. Further, one terminal of a SCR is connected to the power conversion module, and another terminal of the SCR is connected to a power supply module. The input undervoltage control module, the overpower protection module, and the controllable load module are each connected in parallel between a first sampling point and the power conversion module, the first sampling point being arranged between the SCR and the power conversion module. The power conversion module is connected to a load module and is configured to convert electric signals provided by the power supply module to a constant voltage, the power conversion module providing the constant voltage to the load module. The input undervoltage control module is configured to control the power conversion module to start or stop power conversion based on a comparison between a voltage at the first sampling point and a first reference voltage. The overpower protection module is configured to control the power conversion module to start or stop power conversion based on a comparison between the voltage at the first sampling point and a second reference voltage. The controllable load module is configured to maintain the SCR to be on when the power conversion module stops power conversion.