Switching power supply and synchronous rectification control circuit thereof

A technology for shutting down control circuits and synchronous rectification, which is applied in electrical components, conversion devices for converting AC power input to DC power output, and output power, etc., which can solve the problem of large diode voltage drop and low energy loss. Conversion efficiency and other issues to ensure timeliness and improve power efficiency
CN113162440AActive Publication Date: 2021-07-23SHENZHEN LII SEMICON CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHENZHEN LII SEMICON CO LTD
Publication Date
2021-07-23

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Abstract

The invention relates to a switching power supply and a synchronous rectification control circuit thereof. The synchronous rectification control circuit comprises a turn-off control circuit, the turn-off control circuit comprises a dynamic detection circuit, and the dynamic detection circuit is configured to delay a switching control signal of a synchronous rectification tube for a second set time and then output the turn-off control signal in combination with the drain-source voltage change monitoring result of the synchronous rectification tube so as to control the turn-off of the synchronous rectification tube. The problem of circuit damage caused by early turn-off or delayed turn-off of the synchronous rectification tube in the prior art is solved.
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Description

Technical field

[0001] The present application relates to a switching power supply and a synchronous rectification control circuit, which belongs to the technical field of switching power supply. Background technique

[0002] Switching power supply, the switching voltage regulator power supply is a new type of regulated power supply with respect to linear regulated power supply, which is controlled by the output voltage real-time monitoring, and dynamically controls the conduction and disconnection of the switching tube in the switching power supply line. Time ratio to stabilize the output voltage.

[0003] The switching power supply is widely used in the power system due to its efficient control and precision output. like figure 1 As shown, it is a flyback switching power supply circuit, and the output of the flyback switch power supply employs the diode D1 rectification, and the energy loss generated by the diode D1 occupies the ratio of the total energy energy of the secondary...

Claims

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