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Buck converter synchronization rectification drive circuit and control method

A technology of synchronous rectification and drive circuit, applied in electrical components, output power conversion devices, etc., can solve problems such as damage to synchronous rectifier tubes, and achieve the effects of improving reliability, solving damage problems, and reducing size

Active Publication Date: 2017-07-14
MORNSUN GUANGZHOU SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In view of this, in order to solve the problem of damage caused by the continuous conduction of the synchronous rectifier that is easy to occur during the startup process of the non-isolated DC-DC step-down converter, the present invention proposes a synchronous rectification drive circuit and method for the step-down converter

Method used

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  • Buck converter synchronization rectification drive circuit and control method
  • Buck converter synchronization rectification drive circuit and control method
  • Buck converter synchronization rectification drive circuit and control method

Examples

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no. 1 example

[0038] Such as image 3 Shown is the schematic diagram of the first embodiment, a step-down converter synchronous rectification drive circuit, characterized in that it includes a control circuit, a drive circuit and a synchronous rectification control signal adjustment circuit, and the output end of the control circuit is connected to the synchronous The input end of the rectification control signal adjustment circuit, the output end of the synchronous rectification control signal adjustment circuit is connected to the input end of the drive circuit; the synchronous rectification control signal adjustment circuit includes: input end 1, ground end 2, output end 3 and capacitor C1 , capacitor C2, resistor R1, resistor R2, diode D1, diode D2, and diode D3; one end of the capacitor C1 is connected to the input terminal 1, and the other end is connected to the cathode of the diode D2; the anode of the diode D2 Connect the ground terminal 2; one end of the resistor R1 is connected t...

no. 2 example

[0052] Such as Figure 4 Shown is the schematic diagram of the second embodiment, a step-down converter synchronous rectification drive circuit, characterized in that it includes a control circuit, a drive circuit and a synchronous rectification control signal adjustment circuit, and the output end of the control circuit is connected to the synchronous The input end of the rectification control signal adjustment circuit, the output end of the synchronous rectification control signal adjustment circuit is connected to the input end of the drive circuit; the synchronous rectification control signal adjustment circuit includes: input end 1, ground end 2, output end 3 and capacitor C1 , capacitor C2, resistor R1, resistor R2, diode D1, diode D2, and diode D3; one end of the capacitor C1 is connected to the input terminal 1, and the other end is connected to the cathode of the diode D2; the anode of the diode D2 connected to the ground terminal 2; one end of the resistor R1 is conn...

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Abstract

The invention relates to a synchronization rectification drive circuit of a buck converter and a control method. The synchronization rectification drive circuit of the buck converter comprises a control circuit, a drive circuit and a synchronization rectification control signal regulation circuit; the control circuit is used for outputting a complementary type drive signal; the drive circuit is used for converting a drive signal having a weak drive capability into a drive pulse having a strong drive capability; and the synchronization rectification control signal regulation circuit can adjust a synchronization rectification drive signal, add dead zone time into the complementary type drive signal, and limit the longest drive pulse time at the same time. The method can effectively solve the electric current flow-backwards damage problem caused by the synchronization rectification circuit when the buck converter adopts a complementary drive circuit, and reliability of overall design of the circuit is improved.

Description

technical field [0001] The invention relates to a driving circuit and a method, in particular to a synchronous rectification driving circuit and a control method of a step-down converter. Background technique [0002] In a non-isolated DC-DC step-down converter, in order to improve the efficiency of the converter, a synchronous rectifier is usually used instead of a unidirectional diode. When the current flows to the output terminal through the synchronous rectifier tube, the conduction of the synchronous rectifier tube can replace the one-way diode, eliminate the voltage drop of the one-way diode, and play the role of synchronous rectification, but the current can also be reversed from the output terminal through the synchronous rectifier tube The flowback converter, that is, the synchronously rectified buck converter has both current output and current consumption capabilities. [0003] Such as figure 1 Shown is a traditional non-isolated DC-DC step-down converter, usual...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/08
CPCH02M1/08
Inventor 张志成
Owner MORNSUN GUANGZHOU SCI & TECH
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