CN201846239U

CN201846239U - Bow net arc testing power supply device

Info

Publication number: CN201846239U
Application number: CN2010205196843U
Authority: CN
Inventors: 吴广宁; 周利军; 王万岗; 高国强; 王波; 陈立; 曹晓斌; 高波; 李瑞芳
Original assignee: Southwest Jiaotong University
Current assignee: Southwest Jiaotong University
Priority date: 2010-09-07
Filing date: 2010-09-07
Publication date: 2011-05-25
Anticipated expiration: 2020-09-07

Abstract

The utility model discloses a bow net arc testing power supply device which comprise an input filter, a rectifier bridge module, an intermediate filter capacitor, inverters, a step-down transformer, an output filter capacitor, a current detection module and a control module, wherein the input filter filters input three-phase 380V alternating current; the rectifier bridge module converts the filtered three-phase alternating current into direct current; the rectified direct current is connected to the inverters after being filtered by the intermediate filter capacitor; the inverters invert the direct current into single-phase alternating current; the step-down transformer convert the single-phase alternating current to required voltage current; the output filter capacitor performs wave shape smoothness to the required voltage current, and then the required voltage current is output; and the current detection module can maintain constant output current. The output current of the bow net arc testing power supply is stable and can truly reflect the characteristics of bow net arc, and bow net arc testing power supply device has the advantages of small size, low energy consumption and low cost.

Description

Bow net arc test supply unit

Technical field

The utility model relates to a kind of bow net arc test supply unit, belongs to the electric railway field.

Background technology

In recent years, the high-speed railway develop rapidly, open-minded in succession along with main high speed passenger dedicated railways such as Beijing-Tianjin, military wide, Zheng Xi, China has entered the high ferro epoch.EMU obtains electric energy from contact line then by contact line conducting wire and pantograph pan sliding contact.Along with the raising of train running speed, also aggravation thereupon of contact line vibration, pantograph collector head vibration makes the electric contact state severe exacerbation of pantograph and contact line to cause bow net (pantograph and contact line) off-line to take place again and again.The bow net electric arc that produces during off-line is seriously ablated contact line conducting wire, pantograph pan, and the high-speed railway traffic safety is brought grave danger, has become the technical bottleneck that the restriction China Express Railway further develops.Therefore, be necessary the characteristic of bow net electric arc is carried out the deep research of system.In the actual operation, because the restriction of factors such as field condition, installation space makes the characteristic of work place study bow net electric arc have very big difficulty.Therefore, adopt simulation experiment system to study the characteristic of bow net electric arc more.Yet, in bow net electric arc simulation experiment system, need a kind of bow net arc test supply unit.At present, the power supply that domestic and international research institution adopts in its bow net arc test device generally is the high-tension electricity potential source, and the high-tension electricity potential source utilizes the high-tension transformer operating voltage that the input voltage conversion is required, it is bulky, energy consumption is many, class of insulation height, cost costliness.

Summary of the invention

The utility model provides a kind of outputting current steadily at the characteristics of bow net electric arc, the bow net arc test supply unit that volume is little, energy consumption is low.

The technical scheme that the utility model is taked is: replace the High Level AC Voltage potential source with big electric current AC constant-current source; Its formation comprises input filter (1), rectifier bridge module (2), middle filter capacitor (3), inverter (4), step-down transformer (5), output filter capacitor (6), current detection module (7), control module (8) and power output end (10); Three-phase alternating current inserts the input of rectifier bridge module (2) through input filter (1), the direct current of rectification output is connected to the input of inverter (4) through middle filter capacitor (3), single-phase alternating current after the inversion is connected to the input of output filter capacitor (6) after step-down transformer (5) step-down, filter capacitor (6) output is connected to the output (10) of supply unit; Current transformer in the current detection module (7) is connected with output (10) punching of supply unit, detect the supply unit output current in real time, and detected current signal is sent into control module (8), control module control inverter (4), regulate output current, form closed-loop control.Control module (8) is made up of single-chip microcomputer, A/D analog to digital converter; The output of current detection module (7) links to each other with the input of A/D analog to digital converter, and the output of A/D analog to digital converter links to each other with input of single chip, and the output of single-chip microcomputer links to each other with the control end of inverter (4).

Its course of work is: input filter (1) is to the three-phase alternating current filtering of input, rectifier bridge module (2) is converted to direct current with filtered three-phase alternating current, middle filter capacitor (3) is to the direct current filtering after the rectification, inverter (4) becomes single phase alternating current (A.C.) with filtered dc inverter, step-down transformer (5) makes this single-phase alternating current export in the mode of low-voltage, high-current, and the single-phase alternating current of this low-voltage, high-current carries out the level and smooth and output of waveform by output filter capacitor (6); Current detection module (7) detects in real time to output current, and detected signal sent into carry out digital signal conversion in the A/D analog to digital converter, digital signal input single-chip microcomputer after the A/D conversion, single-chip microcomputer compares input signal and preset value, and control inverter (4) output, it is constant to keep output current.

The utility model is owing to adopt switching device transformation technology, saved the H.V. step up transformer bulky, that cost is expensive, 1), outputting current steadily and realized the closed-loop control of output current having following good effect:, can truly reflect the characteristics of bow net electric arc; 2) this power volume is little, energy consumption is low, low price.

Description of drawings

Fig. 1 is circuit theory of the present utility model and basic structure schematic diagram

Embodiment

Bow net arc test supply unit is seen Fig. 1, this device comprises: EMI input filter (1), Rct three phase rectifier bridge module (2) (rated voltage 1600V, electric current 300A), middle filter capacitor (6800uF, 1000V) (no-load voltage ratio is 11: 5 for (3), Full-bridge SPWM inverter (4), step-down transformer (5), capacity is 60KVA), output filter capacitor (6) (10000uf, 250V), current detection module (7) (present embodiment employing Hall current sensor), control module (8) and power output end (10); The output of 380V three-phase alternating-current supply links to each other with EMI input filter (1), the output of EMI input filter (1) is connected with the input of Rct three phase rectifier bridge module (2), the output of Rct three phase rectifier bridge module (2) is with after middle filter capacitor (3) is in parallel, be connected to the input of SPWM inverter (4), the output of SPWM inverter (4) links to each other with the first side winding of step-down transformer (5), the secondary of step-down transformer (5) is surveyed winding and is linked to each other with the output (10) of supply unit with output filter capacitor (6) back in parallel, and current detection module (7) is connected with output (10) punching of supply unit; Control module (8) is made of 89C196 single-chip microcomputer, A/D analog to digital converter (16); The output of current detection module (7) links to each other with the input of A/D analog to digital converter (16), the output of A/D analog to digital converter (16) links to each other with the 89C196 input of single chip, and the output of 89C196 single-chip microcomputer links to each other with the control of SPWM inverter (4).

Its course of work is: the input three-phase alternating current filtering that EMI input filter (1) is right, Rct three phase rectifier bridge module (2) is with filtered three-phase alternating current conversion direct current, middle filter capacitor (3) is to the direct current filtering after the rectification, SPWM inverter (4) becomes single-phase alternating current with filtered dc inverter, step-down transformer (5) is transformed to required electric current and voltage with this single-phase alternating current, and carries out the level and smooth and output of waveform by output filter capacitor (6); Current detection module (7) detects in real time to output current, detected signal sent into carry out digital signal conversion in the A/D analog to digital converter (16), digital signal input 89C196 single-chip microcomputer after the A/D conversion, single-chip microcomputer compares input signal and preset value, and control inverter (4) work, it is constant to keep output current.

Claims

1. a bow net arc test supply unit is characterized in that comprising: input filter (1), rectifier bridge module (2), middle filter capacitor (3), inverter (4), step-down transformer (5), output filter capacitor (6), current detection module (7), control module (8) and power output end (10); Three-phase alternating current inserts the input of rectifier bridge module (2) through input filter (1), the direct current of rectification output is connected to the input of inverter (4) through middle filter capacitor (3), single-phase alternating current after the inversion is connected to output filter capacitor (6) output after step-down transformer (5) step-down, filter capacitor (6) is connected to the output (10) of supply unit; Current transformer in the current detection module (7) is connected with output (10) punching of supply unit, detect output end current in real time, and detected current signal is sent into control module (8), control module control inverter (4), regulate output current, form closed-loop control.

2. bow net arc test supply unit according to claim 1 is characterized in that described control module (8) is made up of single-chip microcomputer, A/D analog to digital converter; The input of A/D analog to digital converter links to each other with the output of current detection module (7), and the output of A/D analog to digital converter links to each other with input of single chip, and the output of single-chip microcomputer links to each other with the control end of inverter (4).