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Self-driven full-bridge synchronous rectification circuit

A synchronous rectification and self-driving technology, applied in electrical components, output power conversion devices, conversion of AC power input into DC power output, etc. Bridge rectification loss, the effect of simplifying the circuit structure

Inactive Publication Date: 2013-12-25
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a self-driven full-bridge synchronous rectification circuit to simplify the circuit structure, reduce the bridge rectification loss, and improve the heat dissipation. stability

Method used

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  • Self-driven full-bridge synchronous rectification circuit
  • Self-driven full-bridge synchronous rectification circuit
  • Self-driven full-bridge synchronous rectification circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] refer to figure 2 with Figure 4, each self-driven active switch includes a power supply circuit, a drive circuit and an execution circuit, wherein the power supply circuit includes a current limiting resistor RA, a switching diode DA, a voltage regulator tube Z, and an energy storage capacitor C; the drive circuit includes a protection resistor RB and an operation circuit Amplifier Q; the execution circuit includes an N-channel MOSFET M with a parasitic diode DB;

[0043] The current-limiting resistor RA is connected between the anode of the switching diode DA and the drain D of the N-channel MOSFET M, the energy storage capacitor C is connected in parallel to the regulator Z, and the anode of the regulator Z is connected to the N The source S of the channel MOSFET tube M, and the negative pole of the voltage regulator tube are connected to the negative pole of the switching diode D;

[0044] In the operational amplifier Q, its inverting input terminal is connected ...

Embodiment 2

[0059] refer to image 3 with Figure 5 , the self-driven active switch of the present invention includes a power supply circuit, a drive circuit and an execution circuit, wherein

[0060] The power supply circuit includes a current-limiting resistor RA, a switching diode DA, a voltage regulator tube Z, and an energy storage capacitor C; the drive circuit includes a protection resistor RB and an operational amplifier Q; the execution circuit includes a P-channel MOSFET tube with a parasitic diode DB;

[0061] The first resistor RA is connected between the cathode of the switching diode DA and the drain D of the P-channel MOSFET, the energy storage capacitor C is associated with the voltage regulator transistor Z, and the cathode of the voltage regulator transistor Z is connected to the P-channel The source S of the MOSFET tube, the anode of the Zener tube is connected to the anode of the switching diode DA;

[0062] Described operational amplifier Q, its inverting input term...

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Abstract

The invention discloses a self-driven full-bridge synchronous rectification circuit which is mainly used for solving the problems that the traditional diode bridge-type circuit is large in commutation wastage, poor in thermal stability and large in heat dissipation volume, and the existing bridge-type synchronous rectification driving circuit is complicated. The rectification circuit comprises four identical self-driven active switches which are in bridging connection, a power supply U, a filter capacitor C and a load R, wherein each self-driven active switch comprises a power supply circuit, a drive circuit and an execution circuit, the power supply circuit comprises a current limiting resistpr RA, a switching diode DA, a stabilivolt Z and an energy-storage capacitor C; the drive circuit comprises a protective resistor RB and an operational amplifier Q; the execution circuit comprises an N channel or P channel MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) M with a parasitic diode DB; both the filter capacitor C and the load R are connected in parallel at the two ends of outputs of the bridge circuit. The self-driven full-bridge synchronous rectification circuit disclosed by the invention has the advantages of simple circuit structure, small commutation wastage, and high thermal stability, and can be used for heavy-current, small-volume and efficient AC (alternating current)-DC (direct current) power conversion.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, in particular to a rectifier circuit, which can be used for single-phase to multi-phase AC-DC power conversion with large current, small volume and high efficiency. Background technique [0002] The traditional rectifier bridge is mainly composed of ordinary diodes. Diodes are passive components. They have the advantages of low cost and simple circuit, and still have high rectification efficiency in higher voltage rectifier circuits, so they are widely used. Its disadvantage is that a relatively high turn-on voltage drop will occur when the diode is working, and a large loss will be generated in a high-current rectification circuit, which is unacceptable for circuits that require high efficiency. Moreover, the large rectification loss will increase the temperature rise of the device, which will affect the reliability, stability and working life of the circuit operation. Therefore, a ...

Claims

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Application Information

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IPC IPC(8): H02M7/217
Inventor 李小平刘彦明谢楷史军刚陈晓东平鹏飞
Owner XIDIAN UNIV
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