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Converter wide gain control method and application thereof

A technology of gain control and converter, which is applied in the direction of control/regulation system, conversion of AC power input to DC power output, and conversion of DC power input to DC power output, etc. It can solve the problems of narrow voltage gain range of LLC resonant converter, etc. Achieve the effects of widening the voltage gain range, reducing costs, and reducing design requirements

Active Publication Date: 2020-12-15
MORNSUN GUANGZHOU SCI & TECH
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem that the voltage gain range of the existing LLC resonant converter is narrow, the present invention proposes a converter wide gain control method and its application

Method used

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  • Converter wide gain control method and application thereof
  • Converter wide gain control method and application thereof
  • Converter wide gain control method and application thereof

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Embodiment Construction

[0036] Such as figure 2 Shown is a circuit schematic diagram of a half-bridge LLC resonant converter using the method of the present invention, including a slave inverter circuit 10 , a resonant circuit 20 , an auxiliary branch 30 , a transformer T and a rectifier filter circuit 40 . figure 2 Vin in is the input power supply, and the resistance Ro is the load.

[0037] The inverter circuit 10 is a half-bridge structure circuit composed of a switch tube S1 and a switch tube S2. The resonant circuit 20 is composed of a resonant inductance Lr, an excitation inductance Lm and a resonant capacitor Cr. The auxiliary branch 30 is composed of a clamp diode D1 and a clamp Composed of a switch tube S3, the rectifying and filtering circuit 40 includes a rectifying module and a filtering module, wherein the rectifying module is composed of a diode D2 and a diode D3, which is full-wave rectification, and the filtering module is composed of a capacitor C0.

[0038]The specific circuit co...

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Abstract

The invention provides a converter wide gain control method, which is applied to an LLC resonant converter composed of an inverter circuit, a resonant circuit, an auxiliary branch, a transformer and arectifier filter circuit. An input voltage is divided into a low voltage section and a high voltage section, and the low voltage section and the high voltage section respectively correspond to two modes: variable-frequency PFM control being adopted in the input voltage low voltage section. the output voltage gain is changed by changing the switching frequency; fixed-frequency duty ratio shiftingPWM control is adopted in the input voltage high-voltage section, and the output voltage gain is changed by changing the duty ratio. According to the invention, the voltage gain range of the convertercan be broadened through switching between variable frequency PFM control and fixed frequency PWM control, ZVS can be realized for all switching tubes, and the overall efficiency of the circuit is relatively high; the control mode is simple, and the cost of the converter can be effectively reduced through the clamping mode of the single switching tube; compared with single PFM control, under thecondition of the same output voltage gain, the frequency change range is smaller, and the design requirements of magnetic core elements such as a transformer are reduced.

Description

technical field [0001] The present invention relates to the technical field of switching converters, in particular to a converter wide gain control method and its application. Background technique [0002] With the development of power electronics technology, switching converters are also gradually developing towards higher power density, which requires further increasing the switching frequency of the converter to reduce the size of passive components, and an important factor limiting the increase in switching frequency is the switch The switching loss of the device, such as the switching loss of the MOS tube. [0003] In order to reduce switching losses, LLC resonant converters have been vigorously developed. This type of converter can realize zero-voltage turn-on (hereinafter referred to as ZVS) of the switch tube, thereby greatly reducing switching loss at high frequencies. However, the traditional half-bridge LLC resonant converter changes the output voltage gain by c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M7/48
CPCH02M3/33569H02M7/48H02M7/4815Y02B70/10
Inventor 任赛璞贾娟娟任鹏程
Owner MORNSUN GUANGZHOU SCI & TECH
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