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A wide gain control method for a converter and its application

A technology of gain control and converter, which is applied in the direction of control/regulation system, DC power input conversion to DC power output, AC power input conversion 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, small frequency variation range, and reducing design requirements

Active Publication Date: 2022-05-20
MORNSUN GUANGZHOU SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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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  • A wide gain control method for a converter and its application
  • A wide gain control method for a converter and its application
  • A wide gain control method for a converter and its application

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Embodiment Construction

[0051] 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.

[0052] 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 rectifier and filter circuit 40 includes a rectifier module and a filter module, wherein the rectifier module is composed of a diode D2 and a diode D3, which is full-wave rectification, and the filter module is composed of a capacitor C0.

[0053] The specific circuit connection me...

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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 a rectification filter circuit. The method of the invention divides the input voltage into low and high The two voltage sections correspond to two modes respectively: when the input voltage is low-voltage section, frequency conversion PFM control is adopted, and the output voltage gain is changed by changing the switching frequency; Duty ratio to change the output voltage gain. The present invention can widen the voltage gain range of the converter by switching between variable-frequency PFM and constant-frequency PWM control, and at the same time, all switch tubes can realize ZVS, and the overall efficiency of the circuit is high; the control mode of the present invention is simple, and the clamping of a single switch tube The method can also effectively reduce the cost of the converter; compared with the single PFM control, when the output voltage gain is the same, the frequency variation range of the present invention is smaller, and the design requirements of magnetic core components such as transformers 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 Patents(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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