US 12,408,246 B2
LED lighting circuit, temporal dimmer circuit and control method based on PWM
Xiaohui Zhu, Nanjing (CN); and Xunran Ji, Nanjing (CN)
Assigned to SWIT ELECTRONICS CO., LTD., Nanjing (CN)
Appl. No. 18/255,534
Filed by SWIT ELECTRONICS CO., LTD., Nanjing (CN)
PCT Filed Dec. 10, 2020, PCT No. PCT/CN2020/135124
§ 371(c)(1), (2) Date Jun. 1, 2023,
PCT Pub. No. WO2022/120677, PCT Pub. Date Jun. 16, 2022.
Claims priority of application No. 202011430044.X (CN), filed on Dec. 7, 2020.
Prior Publication US 2024/0023216 A1, Jan. 18, 2024
Int. Cl. H05B 45/30 (2020.01); H05B 45/10 (2020.01); H05B 45/325 (2020.01); H05B 45/345 (2020.01)
CPC H05B 45/325 (2020.01) [H05B 45/10 (2020.01); H05B 45/345 (2020.01)] 15 Claims
OG exemplary drawing
 
1. An LED lighting circuit based on PWM, comprising a power source, a control circuit and an LED light-emitting element, and further comprising a non-light-emitting load element, the non-light-emitting load element being connected in parallel to the LED light-emitting element, the power source being connected to a constant-current source, the constant-current source supplying power to the LED light-emitting element and the non-light-emitting load element, and when the constant-current source is in a current rising or falling phase, the control circuit controlling an LED light-emitting element loop to be disconnected, and controlling a non-light-emitting load element loop to be connected; and when the current of the constant-current source is in a steady state, the control circuit controlling the non-light-emitting load element loop to be disconnected, and controlling the LED light-emitting element loop to be connected.