US Patent No. 10,342,077

LED DRIVING CIRCUIT AND TUBE LAMP


Patent No. 10,342,077
Issue Date July 02, 2019
Title Led Driving Circuit And Tube Lamp
Inventorship Jizhong Pu, Shaoxing (CN)
Caiying Gan, Shaoxing (CN)
Jiaming Zhou, Shaoxing (CN)
Assignee CH LIGHTING TECHNOLOGY CO., LTD., Shaoxing (CN)

Claim of US Patent No. 10,342,077

1. An LED driving circuit, comprising:a rectifying unit comprising an input terminal, an output terminal and a grounding terminal, wherein the grounding terminal of the rectifying unit is electrically connected to a first ground wire;
a first filtering unit comprising a first input terminal, a second input terminal and an output terminal, wherein the first input terminal of the first filtering unit is electrically connected to the output terminal of the rectifying unit;
a voltage converting unit comprising an input terminal and an output terminal, wherein the input terminal of the voltage converting unit is electrically connected to the output terminal of the first filtering unit, wherein the voltage converting unit is configured to convert a direct current voltage inputted to the input terminal of the voltage converting unit into another or multiple direct current voltages, and converted voltages are outputted from the output terminal of the voltage converting unit; and
an impedance detection and protection unit comprising an input terminal and a grounding terminal, wherein the input terminal of the impedance detection and protection unit is electrically connected to the second input terminal of the first filtering unit, the grounding terminal of the impedance detection and protection unit is electrically connected to the first ground wire, and the impedance detection and protection unit is configured to detect an impedance between the second input terminal of the first filtering unit and the first ground wire, so as to control the second input terminal of the first filtering unit to connect to or disconnect from the first ground wire according to a magnitude of the detected impedance.