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Wide-gain control method for LLC resonant converter and resonant converter

A resonant converter, gain control technology, applied in the control/regulation system, the conversion of AC power input to DC power output, the conversion of DC power input to DC power output, etc. Efficiency and power density, optimized operating conditions, effect of widening voltage gain range

Active Publication Date: 2019-12-20
MORNSUN GUANGZHOU SCI & TECH
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Problems solved by technology

However, this three-mode scheme can only achieve smooth switching between the full-bridge LLC variable-frequency control mode and the full-bridge LLC fixed-frequency control mode under ideal conditions, while the full-bridge LLC fixed-frequency control mode and Half-bridge LLC frequency conversion control mode still cannot achieve smooth switching between these two modes

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  • Wide-gain control method for LLC resonant converter and resonant converter
  • Wide-gain control method for LLC resonant converter and resonant converter
  • Wide-gain control method for LLC resonant converter and resonant converter

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Embodiment Construction

[0034] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0035] The present invention proposes a control method for a wide-gain LLC resonant converter, by dividing the input voltage range into three voltage segments of low, medium and high, corresponding to three control modes respectively,

[0036] In the low-voltage section of the input voltage range, the full-bridge LLC PFM control mode is adopted to change the output voltage gain by changing the switching frequency;

[0037] In the medium-voltage section of the input voltage range, the full-bridge LLC PWM phase-shift control mode is adopted. In the entire medium-voltage section, the switching frequency fsw is equal to the resonant frequency fr0, and the output voltage gain is changed by changing the phase-shift angle θ;

[0038] In the high-voltage section of the input voltage range, the full-bridge LLC variable duty cycle D control mode is adopted. In the entire high-...

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Abstract

The invention discloses a wide-gain control method for an LLC resonant converter and the resonant converter. The method comprises the steps of: employing a full-bridge LLC PFM control mode at a low-voltage segment of an input voltage range, and changing an output voltage gain through changing a switching frequency; adopting a full-bridge LLC PWM phase shift control mode in a medium-voltage sectionof an input voltage range, wherein in the whole medium-voltage section range, the switching frequency fsw is equal to the resonant frequency fr0, and the output voltage gain is changed by changing the phase shift angle [theta]; in a high-voltage section of an input voltage range, adopting a full-bridge LLC variable duty ratio control mode, wherein in the whole high-voltage section range, the switching frequency fsw is equal to the resonant frequency fr0, and the output voltage gain is changed by changing the duty ratio of a primary side first switching tube S1. According to the invention, smooth switching between modes is achieved, the working efficiency, the gain range and the power density of the converter are improved, and the requirements of a wide-voltage gain range conversion occasion are met.

Description

technical field [0001] The invention relates to the field of switching converters, in particular to a wide gain control method of an LLC resonant converter and the resonant converter thereof. Background technique [0002] With the rapid development of the field of power electronics, switching converters are used more and more widely. People put forward more requirements for switching converters: high power density, high reliability, high efficiency, small size, and wide input voltage range. As a kind of resonant converter, LLC resonant converter has many advantages, such as low noise, low stress, and low switching loss. However, the traditional LLC resonant converter generally needs to adjust the output voltage by changing the switching frequency. When the input voltage range is wide, the switching frequency needs to be changed in a wide range. When the frequency is too low, it is easy to enter the capacitive state. Zero-voltage turn-on cannot be realized; when the frequen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M7/5387
CPCH02M3/33569H02M7/5387H02M7/4815Y02B70/10
Inventor 李思远余逸群李永昌
Owner MORNSUN GUANGZHOU SCI & TECH
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