Patent ID: 11870362
Assignee: WUXI CHIPOWN MICROELECTRONICS CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 13:
14. The synchronous rectification control circuit according to claim 13, wherein the light-load signal generation circuit further comprises a detection trigger sub-circuit having an input terminal provided with the sampling voltage, a control terminal coupled to the output terminal of the pulse signal generation circuit, a first output terminal coupled to a control terminal of the second counter, and a second output terminal coupled to the output terminal of the light-load signal generation circuit; and
the detection trigger sub-circuit is configured to output a first trigger signal to the control terminal of the second counter based on that the number of consecutive times that the sampling voltage is a low level reaches a third preset value, and output a second trigger signal, after detecting the generation of the light-load signal and when the number of consecutive times that the sampling voltage is a low level reaches a fourth preset value, so that the light-load signal generation circuit stops generating the light-load signal.