Power frequency ripple suppression method and device for LLC converter

A ripple suppression and converter technology, applied in the field of converters, can solve the problems of reducing power frequency ripple, increasing application space requirements, increasing hardware, etc., to reduce ripple, improve regulation ability, and improve output voltage quality effect

Active Publication Date: 2014-10-01
SHENZHEN VMAX NEW ENERGY CO LTD
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AI Technical Summary

Problems solved by technology

However, due to the limitation of the volume of the converter, the size of the filter inductor used in the LC filter circuit cannot be made as large as possible, so the power frequency ripple cannot be reduced as much as possible; in addition, the filter capacitance of the RC filter circuit is increasing in specific applications. To a certain extent, its effect on reducing the power frequency ripple is significantly reduced. At the same time, this method of adding hardware not only increases the cost, but also increases the requirements for application space.

Method used

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  • Power frequency ripple suppression method and device for LLC converter
  • Power frequency ripple suppression method and device for LLC converter
  • Power frequency ripple suppression method and device for LLC converter

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[0062] The technical scheme of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific examples, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention .

[0063] refer to figure 2 As shown, the embodiment of the present invention provides a power frequency ripple suppression method for LLC converter, wherein: in the digital loop control structure, the voltage loop is used as the main control, and the ripple loop is added as the compensation control, in:

[0064] The ripple loop: performing a first digital filtering process on the sampled output voltage, making a difference between the average value of the output voltage obtained through the first digital filtering process and the sampled value of the output voltage to obtain a first difference, and calculating the After the first difference is subj...

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Abstract

The invention belongs to the technical field of converters and discloses a power frequency ripple suppression method and device for an LLC converter in order to overcome the defects existing in the existing LLC converter power frequency ripple suppression technology. In the method, a voltage loop is used as main control, and a ripple loop is added and used as compensation control. By the adoption of the power frequency ripple suppression method and device, in the mode that ripple control and voltage loop control are combined, the gain of a power frequency doubling band of a system is increased, and the adjusting capacity of the system on the power frequency band is improved; consequently, the beneficial effects that ripples are reduced and the quality of output voltages is improved are achieved.

Description

technical field [0001] The present invention relates to the technical field of converters, in particular to a power frequency ripple suppression method and device thereof for LLC converters. Background technique [0002] The power resonant converter is based on the resonant circuit as the basic conversion unit. When the circuit resonates, the current or voltage crosses zero periodically, 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 and achieve The purpose of reducing switching losses. [0003] Such as figure 1 As shown, it is an implementation schematic diagram of an LLC resonant converter, which includes: an LLC main power conversion circuit, a digital signal processor, an output voltage sampling circuit, an output current sampling circuit, and a primary side isolation drive circuit. [0004] The digital signal processor obtains the output voltage provided by the output voltage sampli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/14
Inventor 马春红吴磊涛刘宇博
Owner SHENZHEN VMAX NEW ENERGY CO LTD
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