Bidirectional full-bridge converter-based wide-output voltage range control method for soft switching

A technology of a full-bridge converter and a control method, which is applied in the direction of converting DC power input into DC power output, output power conversion device, control/regulation system, etc. scope, etc.

Inactive Publication Date: 2016-06-01
STATE GRID INTELLIGENCE TECH CO LTD
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Problems solved by technology

Considering the discharge depth of the energy storage battery, the converter will work in a wide power range. In order to improve the efficiency of the converter, it is necessary to realize soft switching within the required power range, w...

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  • Bidirectional full-bridge converter-based wide-output voltage range control method for soft switching
  • Bidirectional full-bridge converter-based wide-output voltage range control method for soft switching
  • Bidirectional full-bridge converter-based wide-output voltage range control method for soft switching

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Embodiment Construction

[0055] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0056] The topological diagram of the bidirectional full-bridge DC converter in the present invention is as follows figure 1 shown. The converter mainly has two full-bridge converters B1 and B2, a resonant inductor Lr, a high-frequency transformer, and input and output power supplies V1 and V2. The conversion bridge B1 is composed of four switching tubes Q11-Q14, and B2 is composed of four switching tubes Q21-Q24.

[0057] The dual modulation disclosed by the present invention realizes the control process of bidirectional full bridge full power range soft switching as follows:

[0058] 1) The eight switching tubes of the bidirectional full-bridge converter have the same operating frequency and a duty cycle of 50%. The upper and lower switching tubes of the same bridge arm set the dead time.

[0059] 2) The control method of the present invention inc...

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Abstract

The invention discloses a bidirectional full-bridge converter-based wide-output voltage range control method for soft switching. The method comprises the following steps: setting working frequencies of all switch tubes of a bidirectional full-bridge converter to be the same, and setting dead time of upper and lower switch tubes of a same bridge arm; determining a power phase-shift angle and a modulating phase-shift angle to be adjustable variables; obtaining conditions of a primary bridge of the bidirectional full-bridge converter for achieving soft switching according to the power phase-shift angle and current constraint conditions of an half cycle, and determining the range of the power phase-shift angle; and determining the relationship between the power phase-shift angle and the modulating phase-shift angle under the maximum power condition and changing a synchronous timing sequence according to the obtained calculation result. The advantages of achieving soft switching within a full-power range and easily achieving wide-range adjustment of the output voltage by the full-bridge converter can be achieved; and zero-voltage switching of all power tubes on a primary side and a secondary side is achieved within the wide-voltage output range from an idle load to a full load.

Description

technical field [0001] The invention relates to the field of DC converters, in particular to a soft-switching wide output voltage range control method based on a bidirectional full-bridge converter. Background technique [0002] As the energy buffer link of the smart grid energy storage system, the energy storage system has been widely used. For example, energy storage units such as batteries, flywheels, and supercapacitors can not only realize the bidirectional flow of electric energy, but also improve the quality of electric energy through the bidirectional DC converter as an intermediate link. Therefore, improving the efficiency of bidirectional DC converters is at the heart of the energy storage task. Considering the discharge depth of the energy storage battery, the converter will work in a wide power range. In order to improve the efficiency of the converter, it is necessary to realize soft switching within the required power range, while the traditional bidirectional...

Claims

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Application Information

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IPC IPC(8): H02M3/335
CPCH02M3/33584H02M1/0058Y02B70/10
Inventor 杨建旭刘爱忠李勇唐亮陈嵩李清川杨勇于波峰陆继清吴韶鑫
Owner STATE GRID INTELLIGENCE TECH CO LTD
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