US 12,446,129 B2
Filter circuit, dimming system, and electronic apparatus
Fei Gong, Guangdong (CN)
Assigned to SHENZHEN SUNRICHER TECHNOLOGY CO., LTD., Shenzhen (CN); and ELEMENTAL LED INC, Reno, NV (US)
Filed by SHENZHEN SUNRICHER TECHNOLOGY CO., LTD., Shenzhen (CN); and ELEMENTAL LED INC, Reno, NV (US)
Filed on May 15, 2024, as Appl. No. 18/664,456.
Claims priority of application No. 202310916156.3 (CN), filed on Jul. 21, 2023.
Prior Publication US 2025/0031290 A1, Jan. 23, 2025
Int. Cl. H05B 45/34 (2020.01); H05B 45/10 (2020.01); H05B 45/38 (2020.01)
CPC H05B 45/34 (2020.01) [H05B 45/10 (2020.01); H05B 45/38 (2020.01)] 20 Claims
OG exemplary drawing
 
1. A filter circuit, comprising:
a first common mode suppression module, a first differential mode suppression module, a first differential mode capacitor module, a second differential mode suppression module, a second common mode suppression module, a second differential mode capacitor module, a rectifier module, and a π-shaped filter module;
wherein the first differential mode suppression module is electrically connected with the first common mode suppression module and the second differential mode suppression module, respectively, the second common mode suppression module is electrically connected with the second differential mode suppression module and the rectifier module, respectively, and the rectifier module is electrically connected with the π-shaped filter module; the first differential mode capacitor module is connected between the first differential mode suppression module and the second differential mode suppression module, the second differential mode capacitor module is connected between the second common mode suppression module and the rectifier module, the first common mode suppression module is configured for electrically connecting with an alternating current power supply through a thyristor dimmer, and the π-shaped filter module is configured for electrically connecting with a booster circuit;
wherein the first common mode suppression module and the second common mode suppression module are configured for suppressing a common mode interference signal in an alternating current voltage signal provided by the alternating current power supply; the first differential mode suppression module, the second differential mode suppression module, the first differential mode capacitor module, and the second differential mode capacitor module are configured for suppressing a differential mode interference signal in the alternating current voltage signal; the rectifier module is configured for rectifying the alternating current voltage signal into a direct current voltage signal; the π-shaped filter module is configured for filtering the direct current voltage signal and transmitting a filtered direct current voltage signal to the booster circuit; and
wherein a sum of a capacitance capacity of the first differential mode capacitor module and the second differential mode capacitor module is less than or equal to a preset value, and a sum of a capacitance capacity of the π-shaped filter module is greater than the sum of the capacitance capacity of the first differential mode capacitor module and the second differential mode capacitor module.