Patent ID: 11942786
Assignee: SHANGHAI BRIGHT POWER SEMICONDUCTOR CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A power supply circuit comprising a rectifier and filter module with an input filter capacitor, a main power stage module, a voltage waveform detection module and a compensation module,
the rectifier and filter module being connected to a power source and configured to receive an alternating current (AC) voltage and convert the AC voltage into a direct current (DC) voltage having a periodic dome-shaped waveform,
the main power stage module being electrically connected to the rectifier and filter module and configured to provide power to a load based on the DC voltage,
the voltage waveform detection module being electrically connected to the rectifier and filter module and configured to detect the DC voltage and output waveform information of the DC voltage,
the compensation module being electrically connected to both the voltage waveform detection module and the main power stage module respectively and configured to generate a compensation signal based on rising phase information and falling phase information of each cycle of the DC voltage derived from the waveform information and trigger the main power stage module to perform a compensation operation based on the compensation signal, the compensation operation configured to compensate total harmonic distortion of the power supply circuit,
wherein the compensation signal indicates adjusting an on-time and/or an off-time of a power switch in the main power stage module.