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Ripple suppression method for three-phase LLC resonant converter

A resonant converter and ripple suppression technology, applied in the direction of converting AC power input to DC power output, high-efficiency power electronic conversion, output power conversion device, etc., can solve the problem of large voltage ripple and reduce voltage ripple , Improve reliability, reduce the effect of voltage gain

Active Publication Date: 2021-11-16
HANGZHOU ZHONGHEN ELECTRIC CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The embodiment of the present application provides a ripple suppression method for a three-phase LLC resonant converter, to at least solve the problem in the related art that the output voltage ripple of the three-phase LLC resonant converter is relatively large under light load or no-load conditions

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  • Ripple suppression method for three-phase LLC resonant converter
  • Ripple suppression method for three-phase LLC resonant converter
  • Ripple suppression method for three-phase LLC resonant converter

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Embodiment Construction

[0051] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application. Based on the embodiments provided in the present application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0052] The LLC resonant converter is based on the resonant circuit as the basic conversion unit. When the circuit resonates, the current or voltage periodically crosses zero, so that the switching device is turned on or off under the condition of zero voltage or zero current, so as to realize soft switching. The purpose of reducing switching losses.

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Abstract

The invention relates to a ripple suppression method for a three-phase LLC resonant converter. The method comprises the steps of carrying out soft start of the three-phase LLC resonant converter, and carrying out open-phase judgment; shielding a third bridge arm in the LLC circuit and keeping a staggered conduction angle of a switching signal between a first bridge arm and a second bridge arm as a first preset angle under the condition that the result of the open-phase judgment indicates to execute the three-phase tangency two-phase operation; and changing the switching frequency by variable-frequency control to enable the output voltage to reach a set standard value. According to the invention, the problem that the voltage ripple of the three-phase LLC resonant converter is large in a light-load or no-load state in the prior art is solved, the interference of the too high ripple on the electronic equipment is eliminated, and the reliability of the electronic equipment is improved.

Description

technical field [0001] The present application relates to the field of switching power supplies, in particular to a light-load ripple suppression method for a three-phase LLC resonant converter. Background technique [0002] The output voltage ripple is an important evaluation index of the switching power supply module. If the voltage ripple is too large, it will have a negative impact on the reliability of electronic equipment, for example, additional harmonics will be generated, power efficiency will be reduced, and noise interference will be generated. For a three-phase resonant converter, when the converter is in a light-load or no-load state, due to the influence of parasitic capacitance, the voltage gain increases, which easily leads to a runaway phenomenon of the converter. [0003] In related technologies, the commonly used solutions to the above problems are as follows: [0004] 1. Increase the dummy load, but this method will increase the cost and power consumpti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/219H02M1/088H02M1/14
CPCH02M7/219H02M1/088H02M1/14Y02B70/10
Inventor 霍崇灿王洋唐珊
Owner HANGZHOU ZHONGHEN ELECTRIC CO LTD
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