Zhejiang Shenghui Lighting Co., Ltd.

Sengled Optoelectronics Co., Ltd.

Zhonghua Wang

Jinxiang Shen

Junshan Lou

Haiyang Yu

A silicon-controlled rectifier (SCR)-compatible constant-voltage circuit that includes an input undervoltage control module, an overpower protection module, a controllable load module, and a power conversion module is provided. The input undervoltage control module, the overpower protection module, and the controllable load module are connected in parallel between a first sampling point and the power conversion module, and the first sampling point is arranged between an SCR and the power conversion module. The power conversion module is configured to provide a constant voltage to a load module. The input undervoltage control module and the overpower protection module are configured to control the power conversion module to start or stop power conversion based on a voltage at the first sampling point. The controllable load module is configured to maintain the SCR to be on when the power conversion module stops power conversion.

Silicon-controlled rectifier-compatible constant-voltage circuit, LED dimming circuit, and related LED lighting apparatus

The present disclosure provides a silicon-controlled silicon (SCR) current-protection circuit. The SCR circuit includes an SCR detection circuit and a protection circuit, a first terminal of the SCR detection circuit being connected to a current sampling point on an output terminal of an SCR device, a second terminal of the SCR detection circuit being connected to a power conversion circuit, a third terminal of the SCR detection circuit being connected to a first terminal of the protection circuit, and a second terminal of the protection being connected to the power conversion circuit. When the SCR device is connected to the SCR current-protection circuit, the SCR detection circuit is configured to detect a current flowing through the current sampling point, convert the current to a voltage, and output the voltage to the protection circuit. The protection circuit is further configured to control on and off states of the power conversion circuit based on the voltage.

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Tongxiang, China

Zhonghua Wang