Control method and device for train and its bidirectional dc-dc converter

Abstract

The invention discloses a control method and device for a train and its bidirectional DC-DC converter. The bidirectional DC-DC converter includes a first conversion branch, a second conversion branch and a third conversion branch connected in parallel, each The first conversion branch includes an upper bridge switch tube and a lower bridge switch tube, and the control method includes the following steps: obtaining the output power of the bidirectional DC-DC converter; judging the power interval where the output power is located; when the output power is in the first In the power range, the upper bridge switching tube and the lower bridge switching tube are controlled so that the first conversion branch, the second conversion branch and the third conversion branch work in turn; Whether the fault flag of the transformation branch is set; if the fault flag of the transformation branch to be switched is set, skip the fault transformation branch and continue to switch to the next transformation branch, so as to improve the efficiency of the transformation branch. The working life of the switching tube prolongs the life cycle of the bidirectional DC-DC converter.

Description

technical field [0001] The present invention relates to the technical field of vehicles, in particular to a control method for a bidirectional DC-DC converter, a non-transitory computer-readable storage medium, a control device for a bidirectional DC-DC converter, and a bidirectional DC-DC converter converter and a train. Background technique [0002] The bidirectional DC-DC converter has always been an important part of the power electronics field. With the development of the vehicle field, the DC-DC converter has also become one of the important components on the train. The bidirectional DC-DC converter in the related art usually adopts three Boost topology structures, that is, the output power of the bidirectional DC-DC converter is improved by connecting three Boost conversion branches in parallel, and the three Boost conversion branches are converted during the working process of the bidirectional DC-DC converter. Branches divide the total power equally. Therefore, th...

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Problems solved by technology

Therefore, the problem existing in the related technology is that, regardless of the size of the target output power, the three Boost conversion branches all work simultaneously, causing the circuit elements to be in the working state for a long time and affecting the working life of the switch tube.

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