US 12,336,073 B2
Lighting device protection circuit having high voltage endurance ability
Fuxing Lu, Fujian (CN); and Bohao Zhang, Fujian (CN)
Assigned to Xiamen PVTECH Co., Ltd., Fujian (CN)
Filed by Xiamen PVTECH Co., Ltd., Fujian (CN)
Filed on Aug. 8, 2023, as Appl. No. 18/231,743.
Claims priority of application No. 202310303030.9 (CN), filed on Mar. 27, 2023.
Prior Publication US 2024/0334571 A1, Oct. 3, 2024
Int. Cl. H05B 45/30 (2020.01); H05B 45/54 (2020.01); H05B 47/24 (2020.01)
CPC H05B 45/54 (2020.01) [H05B 45/30 (2020.01); H05B 47/24 (2020.01)] 9 Claims
OG exemplary drawing
 
1. A lighting device protection circuit having high voltage endurance ability, comprising:
an input module connected to an external power source, and comprising a positive electrode input end and a negative electrode input end;
a rectifying module having a first end, a second end, a third end and a fourth end, wherein the first end is connected to the positive electrode input end, the second end is connected to a first node, the third end is connected to the negative electrode input end, and the first node is connected to a grounding point;
a driving module having a first pin, a second pin, a third pin and a fourth pin, wherein the first pin is connected to the fourth end of the rectifying module, the second pin is connected to the first node, the third pin is connected to a second node, the fourth pin is connected to a positive electrode of a light-emitting diode module, and the second node is connected to a negative electrode of the light-emitting diode module; and
a varistor connected to the light-emitting diode module in series, wherein two ends of the varistor are connected to the first node and the second node respectively, wherein a total voltage endurance value of a circuit module formed by connecting the varistor to the light-emitting diode module in series is a sum of a voltage endurance value of the varistor and a clamping voltage of the light-emitting diode module, and wherein the clamping voltage of the light-emitting diode module bears a portion of a surge voltage to effectively prevent electronic components of the lighting device protection circuit from being burnt out due to over-high surge voltage, thus improving safety of the lighting device protection circuit.