Automobile auxiliary current transformer

A vehicle auxiliary and inverter technology, applied in vehicle components, current collectors, electric vehicles, etc., can solve the problems of large electromagnetic interference, serious switching noise, large voltage/current spikes, etc., to meet the requirements of lightweight design, The effect of reducing switching noise and switching loss

Inactive Publication Date: 2008-08-27
BEIJING JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 ...

Method used

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  • Automobile auxiliary current transformer
  • Automobile auxiliary current transformer
  • Automobile auxiliary current transformer

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Experimental program
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Embodiment approach 1

[0020] FIG. 2 shows the configuration of the main circuit of the vehicle auxiliary converter according to Embodiment 1 of the present invention. In the figure, the auxiliary converter obtains power from the overhead line 1 through the pantograph 2 . The overhead line 1 is the third rail of the overhead line or the ground.

[0021] The structure of the grid-side filtering part 3 is as follows: the diode 6 is connected to the collector of the grid-side power switch tube 7, the emitter of the grid-side power switch tube 7 is connected to the positive pole of the filter capacitor 9 to form the positive pole of the DC bus, and the soft-start resistor 8 The two ends are respectively connected to the collector of the grid-side power switch tube 7 and the emitter of the grid-side power switch tube 7 . The fuse 4 in the filter part 3 of the grid side is used to protect the auxiliary converter device, the filter reactance 5 and the filter capacitor 9 form an LC smoothing unit, and the ...

Embodiment approach 2

[0025] FIG. 3 shows the configuration of a main circuit of a vehicle auxiliary converter according to Embodiment 2 of the present invention. The circuit topology is basically the same as that described in Embodiment 2, except for the DC / DC chopper 10 in the DC conversion part 14 and the DC / DC chopper 15 in the AC conversion part 21 . In this embodiment, the voltage-type power switching device in the DC / DC chopper works in a state of ZVS soft switching (zero voltage soft switching).

[0026] The main circuit topology of the DC / DC chopper 10 in the DC conversion part 14 is a full-bridge chopper circuit, and a resonant capacitor C is connected in parallel at both ends of each voltage-type power switch tube in the main circuit. r1 , connect the resonant inductor L before the transformer 11 r1 and blocking capacitor C b1 , using phase-shifted full-bridge ZVS PWM control to ensure that before each power switch is turned on, the voltage across its collector and emitter is reduced t...

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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...

Claims

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Application Information

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IPC IPC(8): B60L1/00B60L5/39
CPCY02T10/7241Y02T10/72
Inventor 刘志刚林文立刁利军李哲峰赵明花卢西伟狄威贾利民牟富强沈茂盛张钢王磊梅樱罗荣娅
Owner BEIJING JIAOTONG UNIV
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