Synchronous rectification circuit and switching power supply
A synchronous rectification and circuit technology, applied in the direction of high-efficiency power electronic conversion, electrical components, adjustment of electrical variables, etc., can solve the problem of high cost of synchronous rectification, and achieve the effect of avoiding insufficient supply and reducing device costs.
Active Publication Date: 2021-03-19
TCL TECH ELECTRONICS (HUIZHOU) CO LTD
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[0003] The main purpose of the present invention is to provide a synchronous rectification circuit and switching power supply, aiming to solve the problem of high cost of integrated circuit synchronous rectification
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[0030] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0032] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relationship between the components in a certain posture (as shown in the accompanying drawings). Relative positi...
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The invention discloses a synchronous rectification circuit and a switching power supply. The circuit comprises a bias circuit, a switch control circuit, a first switch and an output filter capacitor,wherein the output filter capacitor, the first switch and the first voltage transformation module form a rectification output loop, the bias circuit is connected with the first voltage transformationmodule, the voltage acquisition end of the switch control circuit is connected with the bias circuit, and the control end of the switch control circuit is connected with a controlled end of the firstswitch; one side, away from the first end of the first transformation module, of the output filter capacitor is grounded; the bias circuit is used for outputting a first signal or a second signal according to the bias voltage and the second end voltage of the first switch; the switch control circuit is used for sending a conduction signal or a cut-off signal to the first switch according to the first signal or the second signal. The synchronous rectification circuit is composed of discrete devices, the device cost can be effectively reduced, and the risk of insufficient supply of an integrated circuit chip can be avoided.
Description
technical field [0001] The invention relates to the field of circuit electronics, in particular to a synchronous rectification circuit and a switching power supply. Background technique [0002] The existing synchronous rectification control methods usually include synchronous rectification of integrated circuits and synchronous rectification of discrete devices. The synchronous rectification of discrete devices has corresponding defects. Insufficient, and the resistance value is too small will produce a large amount of static power loss, therefore, AC-DC switching power supply usually adopts integrated circuit synchronous rectification control, and in the integrated circuit synchronous rectification process, need to use synchronous rectification control chip ,higher cost. Contents of the invention [0003] The main purpose of the present invention is to provide a synchronous rectification circuit and a switching power supply, aiming at solving the problem of high cost of...
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IPC IPC(8): H02M3/335H02M7/217
CPCH02M3/33592H02M7/217Y02B70/10
Inventor 刘志成吴夕
Owner TCL TECH ELECTRONICS (HUIZHOU) CO LTD