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

Claim 10:
11. The synchronous rectification control circuit according to claim 10, wherein the pre-pulse signal generation circuit comprises a first Schmitt trigger, a fourth current source, a fourth NMOS transistor, a fifth NMOS transistor, a fourth capacitor, a seventh comparator and a first counter, where the first Schmitt trigger has an input terminal provided with the sampling voltage, and an output terminal coupled to a gate of the fourth NMOS transistor and a control terminal of the first counter;
the fourth NMOS transistor has a drain coupled to a second terminal of the fourth current source and a second input terminal of the seventh comparator, and a source grounded;
the fourth current source has a first terminal provided with a preset power supply voltage;
the fifth NMOS transistor has a gate coupled to an output terminal of the seventh comparator, a drain coupled to a second input terminal of the seventh comparator, and a source grounded;
the fourth capacitor has a first terminal coupled to the second input terminal of the seventh comparator, and a second terminal grounded;
the seventh comparator has a first input terminal provided with a fifth reference voltage, and an output terminal coupled to an input terminal of the first counter;
the first counter has an output terminal coupled to the output terminal of the pre-pulse signal generation circuit; and
the pre-pulse signal generation circuit is configured to output the pre-pulse signal when a count value of the first counter reaches a first preset value.