A Control Method of Full-Bridge Converter with Asymmetric Duty Cycle
A technology of a full-bridge converter and a control method, which is applied in the direction of control/regulation system, output power conversion device, DC power input conversion to DC power output, etc., which can solve the problems of high power backflow and affecting the working efficiency of the converter, etc. Achieve the effects of suppressing backflow, shortening the time of leakage inductance current drop, and reducing reactive power
Active Publication Date: 2017-10-24
无锡中汇汽车电子科技有限公司
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Problems solved by technology
The common control method of the full-bridge converter is phase-shift control. Although the phase-shift control method can achieve soft switching, etc., one of the prominent problems is that it will generate a large power backflow, which will affect the work of the converter. efficiency
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[0030] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.
[0031] figure 1 It is a typical full-bridge converter main circuit selected by the present invention. figure 1 Among them, the upper and lower switching tubes of the left and right bridge arms of the full bridge are complementary to conduction, but the conduction duty ratios of the upper and lower switching tubes are not equal, that is, the duty ratios of the upper and lower switching tubes are asymmetrical, which means The conduction duty cycle of each switch tube is not 0.5. Specifically, the upper switching tube Q of the left bridge arm 1 and lower switching tube Q 2 The conduction duty cycle of the right bridge arm is not equal, the upper switching tube Q of the right bridge arm 3 and lower switching tube Q 4 The on-duty ratios are also not equal. But it needs to be satisfied, the upper switch tube Q of the left bridge arm 1 and t...
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The invention discloses a control method for a full-bridge converter with an asymmetrical duty ratio. The upper and lower switch tubes of the left and right bridge arms in the full bridge are conducted in a complementary manner, but the conduction duty cycle of each switch tube is not 0.5, that is, The duty cycle of the upper and lower switching tubes is asymmetric; at the same time, in each cycle, the state sequence of the primary side of the transformer is +1, -1, 0, that is, the voltage sequence of the primary side of the transformer is Vin, -Vin, 0; , the output rectifier is directly connected to the load without inductive filtering. The invention can effectively shorten the falling time of the leakage inductance current of the primary side of the transformer, suppress the backflow of power, reduce the reactive power, and obviously improve the efficiency of the system.
Description
technical field [0001] The invention relates to a control method of a full-bridge converter with an asymmetrical duty ratio, which is mainly applied to a full-bridge converter circuit of medium and high power. Background technique [0002] The isolated DC-DC converter is a DC-DC conversion topology that can realize both voltage change and electrical isolation. In addition to being used in electric vehicles, it is used in distributed power generation, energy storage systems, renewable energy power generation, and communication and aerospace. and other fields have broad application prospects. In distributed power generation systems, it is used in fuel cell power stations, military mobile power supplies, and hybrid energy management systems. In the application of energy storage system, it is used in battery energy storage system, supercapacitor energy storage system, superconducting energy storage system and flywheel energy storage system, etc. In renewable energy systems, it...
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IPC IPC(8): H02M3/335
Inventor 刘斌陈武宁光富吴鸿亮朱青山
Owner 无锡中汇汽车电子科技有限公司