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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

Active Publication Date: 2021-07-23
SHENZHEN LII SEMICON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] This application provides a switching power supply and its synchronous rectification control circuit, which can solve the problem in the prior art that the output terminal of the switching power supply passes through a diode with a large voltage drop, and the energy loss generated by it will greatly reduce the conversion efficiency of the flyback switching power supply

Method used

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  • Switching power supply and synchronous rectification control circuit thereof
  • Switching power supply and synchronous rectification control circuit thereof
  • Switching power supply and synchronous rectification control circuit thereof

Examples

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Embodiment Construction

[0038] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following examples are intended to illustrate the present application, but not to limit the scope of the present application.

[0039] For the output of the switching power supply, since the diode rectification is used, since the diode is turned on, the resulting energy loss is greatly reduced by the conversion efficiency of the flyback switching power supply, and the MOSFET (Metal-Oxide) can be used. -Semiconductor-Field-EffectTransistor, metal-oxide-semiconductor field effect transistor) replaces rectifier diode.

[0040] like figure 2 As shown, the synchronous tube (ie MOS tube) Q2 is used instead diode D1, and the conduction drop of the synchronous tube Q2 can be reduced to less than 0.1 V, and the generated energy loss is very small.

[0041] The MOS tube Q2 is a gate control device, which is fitted with a synchronous rectified control circuit, and the synchronous rectified control circuit is used to control the swi...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/217H02M1/08
CPCH02M7/217H02M1/08Y02B70/10
Inventor 林新春张杰邱诚玉
Owner SHENZHEN LII SEMICON CO LTD
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