Patent ID: 11949337
Assignee: PHIHONG TECHNOLOGY CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A flyback power converter, comprising:
a controller;
a high-end driving circuit coupled to said controller;
an active clamp switching device coupled to said high-end driving circuit to drive said active clamp switching device;
a main switching device coupled to said controller and driven by said controller; and
a zero current detection circuit including a first comparator, and a first output terminal of said first comparator being electrically coupled to said controller to detect current information of a DC output circuit coupled to a secondary side of a transformer;
a second comparator having an output terminal coupled to a first input terminal of said first comparator;
wherein said high-end driving circuit drives said active clamp switching device in response to said current information;
wherein said zero current detection circuit outputs a control signal through said first comparator based on said current information of an output diode of said DC output circuit to control demagnetization terminal voltage of said controller to drive said high-end driving circuit, wherein said main switching device is controlled by said controller with reverse phase of said control signal; and
wherein a first duty cycle of a first gate of said active clamp switching device and a second duty cycle of a second gate of said main switching device are controlled in reverse phase.