Automobile auxiliary current transformer

Abstract

The invention relates to a vehicle auxiliary converter, which comprises a line side filtrating part (3), a direct-current conversion part (14) and an alternating-current conversion part (21). A diode (6) in the line side filtrating part is connected with a collecting electrode of a line side power switching tube (7), an emitting electrode of the line side power switching tube (7) is connected with an anode of a filtrating capacitor (9) to form the anode of a direct-current bus, both ends of a soft starting resistance (8) are respectively connected with the collecting electrode of the line side power switching tube (7) and the emitting electrode of the line side power switching tube (7). Power switching tubes of DC / DC wave choppers (10, 15) operate in a soft switching state. A DC / DC wave chopper (10) of the direct-current conversion part and the alternating-current conversion part is a zero-voltage soft switching resonant converter. The adoption of a contactless power switching tube instead of a contactor reduces the noise of the switch; as the power switching tube operates in the soft switching state, the consumption of the switch is reduced, and the adoption of a high-frequency transformer to insulate results in light weight.

Description

technical field [0001] The invention belongs to the field of auxiliary power supplies for rail transit light rail vehicles, and in particular relates to an auxiliary converter for vehicles. Background technique [0002] The auxiliary converter of the vehicle obtains DC power from the overhead power supply line (or the third rail on the ground), converts it into AC power and DC power, and supplies power to the AC equipment and DC equipment on the vehicle respectively. [0003] The traditional auxiliary converter described in "China Railway Science" 2004 No. 1 "Analysis and Research on Subway Vehicle Auxiliary Inverter" and "Locomotive Electric Transmission" 2006 No. 5 "Guangzhou Metro Line 2 Vehicle Auxiliary Inverter" The disadvantages of the device are as follows: [0004] 1) The soft start part of the filter part on the grid side adopts the form of "contactor parallel soft start resistance", the contactor is bulky, the switching noise is serious, and the electromagnetic i...

AI Technical Summary

Problems solved by technology

[0004] 1) The soft start part of the filter part on the grid side adopts the form of "contactor parallel soft start resistance", the contactor is bulky, the switching noise is serious, and the electromagnetic interference is large;

[0005] 2) The power switching tube of the DC chopper part works in a hard switching state, with large voltage / current spikes, serious electromagnetic interference and switching losses;

[0006] 3) The AC power supply system generally uses a power frequency transformer for isolated output, which is large and heavy, and is generally placed at the bottom of the vehicle

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