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A wide gain control method of llc resonant converter and resonant converter thereof

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

Active Publication Date: 2020-08-18
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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  • A wide gain control method of llc resonant converter and resonant converter thereof
  • A wide gain control method of llc resonant converter and resonant converter thereof
  • A wide gain control method of llc resonant converter and resonant converter thereof

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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 of an LLC resonant converter and the resonant converter thereof. In the low-voltage section of the input voltage range, the full-bridge LLC PFM control mode is adopted, and the output voltage gain is changed by changing the switching frequency; In the medium-voltage section of the 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; in the input voltage range In the high-voltage section, the full-bridge LLC variable duty cycle control mode is adopted. In the entire high-voltage section, the switching frequency fsw is equal to the resonant frequency fr0, and the output voltage gain is changed by changing the duty cycle of the first switching tube S1 on the primary side. The invention realizes smooth switching between modes, improves the working efficiency, gain range and power density of the converter, and satisfies the requirements of wide voltage gain range conversion occasions.

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 Patents(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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