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Phase shift control method for full load range zvs of dual active full bridge bidirectional dc-dc converter

A DC-DC, phase-shift control technology, applied in control/regulation systems, conversion of DC power input to DC power output, instruments, etc., can solve problems such as inability to achieve soft switching and complex control strategies

Active Publication Date: 2020-04-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the problems that the dual active full bridge bidirectional DC-DC converter cannot realize soft switching in the full load range and the control strategy is complex when considering the junction capacitance, the full load of the dual active full bridge bidirectional DC-DC converter disclosed in the present invention The technical problem to be solved by the range ZVS phase-shift control method is: reduce the turn-on loss and transformer loss caused by current stress and return power, realize the full load range ZVS of the converter in a wide voltage range, and reduce the converter in any working condition. Lower the switching loss of the switching tube, improve the efficiency and reliability of the converter

Method used

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  • Phase shift control method for full load range zvs of dual active full bridge bidirectional dc-dc converter
  • Phase shift control method for full load range zvs of dual active full bridge bidirectional dc-dc converter
  • Phase shift control method for full load range zvs of dual active full bridge bidirectional dc-dc converter

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Embodiment Construction

[0116] The present invention will be described in detail below in conjunction with accompanying drawing and embodiment, have also described technical problem and beneficial effect that technical solution of the present invention solves simultaneously, it should be pointed out that described example is only intended to facilitate the understanding of the present invention, and to It does not have any limiting effect.

[0117] like figure 1 As shown, the dual-active full-bridge bidirectional DC-DC converter disclosed in this embodiment is mainly composed of a main circuit and a control circuit. The main circuit is composed of two full bridges, the middle part is connected by a high-frequency transformer, and the magnetizing inductance is connected in parallel at both ends of the transformer. The leakage inductance of the transformer is used as an energy storage element, which is an interface connecting the energy of the input end and the output end, and is a bidirectional energy...

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Abstract

The invention discloses a phase-shift control method for ZVS in the full load range of a dual-active full-bridge bidirectional DC-DC converter, which belongs to the field of high-frequency switching power supplies in the field of power electronics. The converter of the present invention introduces excitation current on the basis of the original topological structure, and compensates the minimum current required for resonance when the secondary side switching tube is turned off, thereby expanding the soft switching range of the secondary side switching tube of the transformer; the present invention operates in EPS mode Based on the injected excitation current, the control strategy of full load range ZVS and low current stress is designed. By controlling the duty cycle of the bridge on the high voltage side and the phase shift angle between the two full bridges, the converter can operate at different voltage ratios. Work in the ZVS region under different transmission powers to ensure the soft switching of the converter in the full load range, reduce the switching loss of the switch tube, reduce the current peak value, reduce the current stress of the power device, and reduce the on-state loss of the converter And circulation loss, further reducing circuit loss. The invention can improve the efficiency and reliability of the converter.

Description

technical field [0001] The invention relates to a phase-shift control method of ZVS in the full load range of a dual-active full-bridge bidirectional DC-DC converter, which belongs to the direction of high-frequency switching power supply in the field of power electronics. Background technique [0002] For power electronics applications that require two-way transmission of power, such as new energy power generation and energy storage batteries, there is a wide range of input and output voltages and load changes. For dual active full bridge bidirectional DC-DC converters, high transmission efficiency is a very important requirement. Zero-voltage switching (ZVS) of power devices can improve converter efficiency. For realizing zero-voltage soft switching, traditional phase-shift control is a very popular and simple control method. But there are some problems that need to be overcome. First of all, the current stress and return power of traditional phase-shift control are rel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335
CPCH02M3/3353H02M1/0048H02M1/0058Y02B70/10
Inventor 许国闫佳璇粟梅孙尧王辉韩华刘永露但汉兵熊文静柳张杰
Owner CENT SOUTH UNIV
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