Sichuan Sunfor Light Co., Ltd

University of Electronic Science and Technology of China

Ning Ning

Dongming Li

Wentao Long

Mian Yang

Zhengyong Feng

Yongming Jia

Chunyi Feng

Dejun Yu

Wenbin Chen

The present disclosure discloses a multipath current source switching device, including a switching control unit, N current paths, and N loads. Each current path is formed by a constant current source circuit and a switching circuit. One terminal of a first load is coupled to a load power supply, and the other terminal of the first load is coupled to an output terminal of a constant current source circuit of a first current path and one terminal of a second load; one terminal of an iload is coupled to the other terminal of an (i&#x2212;1)load and an output terminal of a constant current source circuit of an icurrent path; and the switching control unit controls an output current of a corresponding constant current source circuit through a corresponding switching circuit. When the circuits are switched, an output voltage of a switching circuit of a current path to be switched off is decreased to zero according to a preset voltage variation quantity, and an output voltage of a switching circuit of a current path to be switched on is increased to a highest operating voltage according to the preset voltage variation quantity, such that a current on a load does not exceed a preset current and is not zero during switching. N is an integer not less than 2, and i is equal to 2, 3, 4, . . . , N.

Multipath current source switching device

An LED lighting drive circuit supplies power for N groups of LED loads. The LED lighting drive circuit comprises N current paths, N groups of LEDs, and a constant current section. The LED lighting drive circuit enables the current of LED lamps to change in a sinusoidal half-wave form with the utility AC input, and keeps the current a constant effective value.

LED lighting drive circuit

Growing community of inventors

Sichuan, China

Ning Ning