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

Claim 15:
16. A switching power supply system, comprising a synchronous rectification control circuit which comprises a sampling circuit, a turn-on comparison circuit, a turn-off comparison circuit, a drive control circuit, and an anti-accidental turn-on circuit,
wherein the sampling circuit has a first terminal coupled to a first output terminal of a transformer, and is configured to obtain a sampling voltage;
the anti-accidental turn-on circuit has a first input terminal coupled to a second terminal of the sampling circuit, and is configured to generate and output a turn-on enable signal based on the sampling voltage;
the turn-on comparison circuit has a first input terminal coupled to the second terminal of the sampling circuit, and a second input terminal coupled to an output terminal of the anti-accidental turn-on circuit, and is configured to generate and output a turn-on signal when receiving the turn-on enable signal;
the turn-off comparison circuit has an input terminal coupled to the second terminal of the sampling circuit, and is configured to generate and output a turn-off signal based on the sampling signal; and
the drive control circuit has a first input terminal coupled to an output terminal of the turn-on comparison circuit, and a second input terminal coupled to an output terminal of the turn-off comparison circuit, and is configured to generate and output a corresponding drive signal to a power switch transistor coupled to the first output terminal of the transformer based on the turn-on signal and the turn-off signal, to control a switching state of the power switch transistor.