Sengled Optoelectronics Co., Ltd.

Zhejiang Shenghui Lighting Co., Ltd.

Zhejiang Shenghu Lighting Co., Ltd.

Junshan Lou

Jinxiang Shen

Zhonghua Wang

Chaoqun Sun

Zhibin Tian

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.

Silicon-controlled rectifier current-protection circuit, related operating method, and dimming circuit and lighting device containing the same

The present disclosure provides a dimming circuit for SCR dimmer (silicon-controlled rectifier) circuit. The dimming circuit includes a signal conversion circuit for converting an input signal to a sine-wave voltage signal and output the sine-wave voltage signal to a current sampling end of a power factor correction circuit. The dimming circuit also includes the power factor correction circuit to receive the sine-wave voltage signal for correcting power factor. A biasing current is generated according to the input signal and is positively correlated to the input signal, and a sine-wave current signal corresponding to the sine-wave voltage signal is a sum of the biasing current and a primary current of a transformer in the power factor correction circuit.

Dimming circuit and dimming system suitable for SCR dimmer circuit

An LED driving and dimming circuit and configuration method are provided. The circuit can include a switch connected to an AC power supply, an LED driver circuit connected to the switch, a switch-status detection circuit connected to the switch, and a brightness-selection circuit having one end connected to the switch-status detection circuit and another end connected to the LED driver circuit. The switch-status detection circuit is configured to detect whether the switch is open or closed and to output a detected result to the brightness-selection circuit. The LED driver circuit is configured to control a brightness level of the LED lighting device, according to a voltage result from the brightness-selection circuit.

Growing community of inventors

Tongxiang, China

Junshan Lou