US 11,751,301 B2
LED driving circuit and LED lamp
Ming Chen, Shanghai (CN); Congyi Lin, Shanghai (CN); Shan Li, Shanghai (CN); Defeng Ni, Shanghai (CN); and Lianjie Xue, Shanghai (CN)
Assigned to Shanghai Sansi Electronic Engineering Co, Ltd., Shanghai (CN); Shanghai Sansi Technology Co, Ltd., Shanghai (CN); Jiashan Sansi Optoelectronic Technology Co, Ltd., Zhejiang (CN); and Pujiang Sansi Optoelectronic Technology Co, Ltd., Jinhua (CN)
Filed by Shanghai Sansi Electronic Engineering Co. Ltd., Shanghai (CN); Shanghai Sansi Technology Co. Ltd., Shanghai (CN); Jiashan Sansi Optoelectronic Technology Co. Ltd., Jiaxing (CN); and Pujiang Sansi Optoelectronic Technology Co. Ltd., Jinhua (CN)
Filed on Feb. 28, 2022, as Appl. No. 17/681,851.
Claims priority of application No. 202121446608.9 (CN), filed on Jun. 28, 2021.
Prior Publication US 2022/0418061 A1, Dec. 29, 2022
Int. Cl. H05B 45/18 (2020.01)
CPC H05B 45/18 (2020.01) 15 Claims
OG exemplary drawing
 
1. An LED driving circuit, comprising:
a power input unit that is coupled to an input voltage;
a voltage conversion unit that is coupled to the power input unit and converts the input voltage into a conversion voltage;
a power output unit that is coupled to an LED light source, wherein the power output unit is further coupled to a first capacitive element, which is connected in parallel with the LED light source;
a first thermistor unit that is connected between the power input unit and the voltage conversion unit, and coupled to the power input unit and the voltage conversion unit respectively; and
a second thermistor unit that is connected between the voltage conversion unit and the power output unit, and coupled to the voltage conversion unit and the power output unit respectively, wherein the second thermistor unit and the conversion voltage generates a driving current passing through the LED light source;
wherein the resistance of the first thermistor unit is positively correlated to its sensed temperature, and the resistance of the second thermistor unit is positively correlated to its sensed temperature to stabilize the value of the driving current,
wherein a co-connection point between the voltage conversion unit and the second thermistor unit is coupled to a second capacitive element.