Driving circuit, LLC resonant converter and power supply equipment

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By introducing a pre-buffered drive circuit and an output current limiting circuit into the drive circuit of the LLC resonant converter, the edge speed of the drive signal is improved, the problem of drive signal transmission delay is solved, and the switching speed and synchronization performance of the switching devices are improved.

CN224249578UActive Publication Date: 2026-05-15SHENZHEN FENGMANG NEW ENERGY TECH CO LTD

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Patent Information

Application Number: CN202521183405.3
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2025-06-11
Publication Date: 2026-05-15
Estimated Expiration: 2035-06-11

Application Information

Patent Timeline

11 Jun 2025

Application

CN202521183405.3

15 May 2026

Publication

CN224249578U

IPC: H02M1/08; H02M3/335; H02M1/32

CPC: Y02B70/10

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Application Domain

Efficient power electronics conversion Dc-dc conversion

Technology Topics

Resonant cavity Current limiting

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AI Technical Summary

Technical Problem

In the existing LLC resonant converter drive circuit, the rise/fall slope of the drive signal is insufficient, which leads to a prolonged switching transition time of the switching transistor, affecting the switching speed and synchronization performance.

Method used

A pre-buffered drive circuit, including operational amplifier U1 and main drive circuit, is introduced into the drive circuit. The operational amplifier U1 is used to increase the edge speed of the drive signal, and combined with the output current limiting circuit, the signal transmission delay is reduced.

Benefits of technology

It improves the edge steepness of the drive signal, reduces signal transmission delay, and improves the switching speed and synchronization performance of the switching device.

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Abstract

The utility model relates to the technical field of power electronics, in particular to a drive circuit, an LLC resonant converter and power supply equipment, which comprises a front buffer drive circuit, a main drive circuit and an output current-limiting circuit, the front buffer drive circuit comprises an operational amplifier U1, the main drive circuit comprises a drive chip U2, and the output current-limiting circuit is connected with the operational amplifier U1. The input end of the operational amplifier U1 is used for receiving a driving signal, the output end of the operational amplifier U1 is connected with the input end of the driving chip U2, the output end of the driving chip U2 is connected with the input end of the output current limiting circuit, and the output end of the output current limiting circuit is used for being connected with an LLC resonant cavity. The utility model can reduce the transmission delay of the driving signal.

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