Parameter design method for preceding-stage DC-DC resistance-capacitance absorption circuit of vehicle-mounted auxiliary power supply

A DC-DC, RC absorption technology, applied in the field of rail transit, can solve the problems of increasing circuit power loss, oscillation, and voltage spikes that cannot achieve the suppression effect

Pending Publication Date: 2022-02-01
CRRC QINGDAO SIFANG ROLLING STOCK RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the circuit parameters are unreasonably designed, it will not only increase the power loss of the circuit, but also may cause the voltage spike to fail to achieve the expected suppression effect, and may even cause more serious oscillations

Method used

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  • Parameter design method for preceding-stage DC-DC resistance-capacitance absorption circuit of vehicle-mounted auxiliary power supply
  • Parameter design method for preceding-stage DC-DC resistance-capacitance absorption circuit of vehicle-mounted auxiliary power supply
  • Parameter design method for preceding-stage DC-DC resistance-capacitance absorption circuit of vehicle-mounted auxiliary power supply

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Embodiment Construction

[0036] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0037] figure 1 A schematic diagram of a parameter design method for a DC-DC resistance-capacitance absorption circuit in the front stage of a vehicle auxiliary power supply provided by an embodiment of the present invention, as shown in figure 1 As shown, the method includes the following steps:

[0038] Step 1: Create the time-domain and S-domain equivalent circuit models of the RC snubber circuit of the preceding DC-DC circuit, and generate corresponding first time-domain models and first S-domain models.

[0039] Here, the to...

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Abstract

The embodiment of the invention relates to a parameter design method for a preceding-stage DC-DC resistance-capacitance absorption circuit of a vehicle-mounted auxiliary power supply. The method comprises the steps: creating a first time domain model and an S domain model of a preceding-stage DC-DC circuit; determining a first voltage and current S domain expression of the resistance-capacitance absorption circuit; substituting preset system parameters into the first voltage and current S-domain expression to generate a corresponding second voltage and current S-domain expression; determining a capacitance parameter CS according to the second voltage S domain expression; performing time domain expression conversion on the second voltage and current S domain expression to generate a corresponding first voltage and current time domain expression; and determining a resistance parameter RS according to the capacitance parameter CS, the first voltage and the current time domain expression. According to the invention, the design accuracy is ensured.

Description

technical field [0001] The invention relates to the technical field of rail transit, in particular to a method for designing parameters of a DC-DC resistance-capacitance absorption circuit at the front stage of a vehicle auxiliary power supply. Background technique [0002] The main function of on-board auxiliary power supply in urban rail vehicles is to provide electric energy for three-phase AC loads such as air conditioners and air compressors on vehicles. Currently, there are two mainstream topologies. One is a single-stage three-phase inverter topology, and the other is a two-stage topology in which the front-stage DC-DC (Direct Current-Direct Current converter) circuit is cascaded to the rear-stage three-phase inverter circuit. Compared with the first topology, the second topology cancels the original power frequency transformer, and the volume and weight of the whole system are greatly improved and optimized. [0003] The zero-voltage conduction characteristic of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20H02M3/335G06F119/20
CPCG06F30/20H02M3/33569G06F2119/20
Inventor 何俊鹏李文慧朱洪庆毕京斌夏猛
Owner CRRC QINGDAO SIFANG ROLLING STOCK RES INST
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