US 12,464,616 B2
PWM signal conversion circuit and method, and LED dimming system
Jun Liu, Wuxi (CN); Quanqing Wu, Wuxi (CN); and Guocheng Li, Wuxi (CN)
Assigned to CRM ICBG ( wuxi ) Co., ltd., Jiangsu (CN)
Appl. No. 18/294,551
Filed by CRM ICBG (WUXI) CO., LTD., Wuxi (CN)
PCT Filed Jul. 29, 2022, PCT No. PCT/CN2022/108902
§ 371(c)(1), (2) Date Feb. 2, 2024,
PCT Pub. No. WO2023/016279, PCT Pub. Date Feb. 16, 2023.
Claims priority of application No. 202110909686.6 (CN), filed on Aug. 9, 2021.
Prior Publication US 2025/0106963 A1, Mar. 27, 2025
Int. Cl. H05B 45/30 (2020.01); H05B 45/10 (2020.01); H05B 45/325 (2020.01)
CPC H05B 45/325 (2020.01) [H05B 45/10 (2020.01)] 15 Claims
OG exemplary drawing
 
1. A PWM signal conversion circuit, comprising at least:
a PWM signal detection module configured to receive a PWM signal, detect a low-level time and a high-level time of the PWM signal, and output a first voltage corresponding to the low-level time and a second voltage corresponding to the high-level time;
an addition module connected to an output end of the PWM signal detection module, configured to sum the first voltage and the second voltage to obtain a third voltage;
a switch signal generation module connected to an output end of the addition module, configured to generate a switch signal based on the third voltage, wherein a frequency of the switch signal is higher than a frequency of the PWM signal;
a duty cycle ratio generation module connected to an output end of the switch signal generation module, configured to start counting the switch signal at a rising edge of the PWM signal, end the counting at a falling edge of the PWM signal, and obtain a duty cycle ratio of the PWM signal; and
an output voltage generation module connected to an output end of the duty cycle ratio generation module, configured to obtain an output voltage related to a duty cycle of the PWM signal based on the duty cycle ratio of the PWM signal.