CN202126486U

CN202126486U - High current generator used for relay contact testing

Info

Publication number: CN202126486U
Application number: CN201120225230XU
Authority: CN
Inventors: 吴德葆; 歹志阳; 王晓换; 周志辉
Original assignee: Xuji Group Co Ltd; Henan Xuji Instrument Co Ltd
Current assignee: Xuji Group Co Ltd; Henan Xuji Instrument Co Ltd
Priority date: 2011-06-29
Filing date: 2011-06-29
Publication date: 2012-01-25
Anticipated expiration: 2021-06-29

Abstract

The utility model relates to a high current generator used for relay contact testing. The high current generator comprises a main circuit and a control circuit; the main circuit comprises an upflow transformer; the input terminal of an AC power supply is connected to the primary side of the upflow transformer, the secondary side is used for outputting high current used for relay contact testing, and one-way controllable silicon is serially connected to the primary side; the control circuit comprises a CPU (Central Processing Unit); and the CPU is connected with the trigger terminal of the one-way controllable silicon in a controlling manner through a controllable silicon triggering drive circuit and is connected with the input terminal of the AC power supply in a sampling manner through an AC zero crossing detecting circuit. In the high current generator, lower current is controlled by the controllable silicon on the primary side of the upflow transformer, and high current is generated on the secondary side of the upflow transformer, so that the purpose of producing high current is achieved. The controllable silicon is mounted on the primary side of the upflow transformer, and current flowing through the controllable silicon is lower, so that the requirement to current specification of the controllable silicon is lowered.

Description

Strong current generator is used in a kind of relay contact test

Technical field

The utility model relates to a kind of strong current generator, and strong current generator is used in particularly a kind of relay contact test.

Background technology

At present; Strong current generator is used in relay contact test on the market; Great majority adopt electric capacity, utilize capacitor discharge to produce instantaneous large-current, and the waveform of this discharge mode waveform and relay contact test request differs greatly; And can not accurately confirm conduction time, be used for relay contact test poor effect.Because electric capacity need charge in advance, so use also conveniently inadequately, and the discharge effect of charge volume size during also to test impacts.

The utility model content

This novel purpose provides a kind of relay contact test and use strong current generator, in the solution prior art, test waveform can not satisfy the relay contact test request and conduction time inaccurate problem.

For realizing above-mentioned purpose; The technical scheme of the utility model is: strong current generator is used in a kind of relay contact test; Comprise main circuit and control circuit, main circuit comprises rising current transformer, and the former limit of rising current transformer connects ac power input end; Secondary is used for the test of output relay contact and uses big electric current, and string is provided with one-way SCR on the former limit; Said control circuit comprises CPU, and said CPU is through the trigger end of the said one-way SCR of controllable silicon triggering driving circuit control linkage, and said CPU connects said ac power input end through the sampling of alternating current zero cross detection circuit.

By the SCR control less current, the very big electric current of secondary generation at rising current transformer reaches the purpose that produces big electric current to this current feedback circuit on the former limit of rising current transformer.Because controllable silicon is installed in the former limit of rising current transformer, the silicon controlled electric current of flowing through is less, has reduced the requirement to the controllable silicon current specification; Utilizing half cycle of 50 hertz of China's civil powers simultaneously, is 10 milliseconds just, when satisfying the relay contact high-current test to the requirement of conduction time.

The former limit of said rising current transformer is also gone here and there and is provided with current-limiting resistance.

Said CPU also control linkage is useful on the pilot lamp of indicating test mode.

Said CPU also imports the connection start-up circuit.Said start-up circuit is artificial button inputting circuits, and circuit output end connects the corresponding input port of said CPU.

Said CPU adopts 32 ARM7 microprocessor LPC2138.

Selected the flush bonding processor LPC2138 of high performance price ratio for use, brought into play characteristics, especially the requirement that its performance is powerful, peripheral hardware is abundant reliable support is provided the alternating current zero crossing detection accuracy.Start-up circuit is used to inform that CPU starts high-current test; Ac zero-crossing detection circuit is used to detect the zero crossing of alternating current, for the silicon controlled trigger pulse provides RP; Controllable silicon triggering driving circuit is used to controllable silicon provides trigger pulse; Tally circuit is used to indicate strong current generator present located state; Controllable silicon is used to control turning on and off of alternating current; Current-limiting resistance is used to control the primary current that flows through rising current transformer; Rising current transformer is used to promote alternating current.

Description of drawings

Fig. 1 is these novel circuit theory diagrams.

Embodiment

Below in conjunction with accompanying drawing to this novel further specifying.

Strong current generator is used in a kind of relay contact test as shown in Figure 1; Comprise main circuit and control circuit; Main circuit comprises rising current transformer T1; The former limit of rising current transformer T1 connects ac power input end, and secondary is used for the test of output relay contact and uses big electric current, and string is provided with one-way SCR Q1 and current-limiting resistance R1 on the former limit; Control circuit comprises CPU; CPU triggers the trigger end of driving circuit control linkage one-way SCR Q1 through controllable silicon; CPU connects said ac power input end through alternating current zero cross detection circuit sampling, adds civil power between AC-A and the AC-N and exchanges 220 volts, and controllable silicon Q1 controls the alternating current break-make; The size of control rising current transformer T1 primary current rises to secondary in proportion with primary current, exports big electric current from secondary, is connected relay contact to be tested between A and the B.

CPU is the control core of this rising current transformer, and it receives start-up circuit, ac zero-crossing detection circuit signal, and the control controllable silicon triggers driving circuit and signal lamp.After start-up circuit (can adopt artificial key mode) manually started, CPU detected enabling signal, the flicker of control signal lamp; After 5 seconds, trigger driving circuit to controllable silicon when detecting alternating current zero crossing and send trigger pip, produce trigger pulse through ac zero-crossing detection circuit; Controllable silicon receives the trigger pulse excitation, the controllable silicon conducting, and alternating current is through the current-limiting resistance current limliting; The rising current transformer up-flow produces big electric current at the secondary of rising current transformer.Controllable silicon turn-offs naturally after alternating current is reverse, and just be 10 milliseconds the conduction time of big electric current.EOT, CPU control signal lamp are normal bright state.

Claims

1. strong current generator is used in a relay contact test; It is characterized in that; Comprise main circuit and control circuit, main circuit comprises rising current transformer, and the former limit of rising current transformer connects ac power input end; Secondary is used for the test of output relay contact and uses big electric current, and string is provided with one-way SCR on the former limit; Said control circuit comprises CPU, and said CPU is through the trigger end of the said one-way SCR of controllable silicon triggering driving circuit control linkage, and said CPU connects said ac power input end through the sampling of alternating current zero cross detection circuit.

2. strong current generator is used in a kind of relay contact test according to claim 1, it is characterized in that the former limit of said rising current transformer is also gone here and there and is provided with current-limiting resistance.

3. strong current generator is used in a kind of relay contact test according to claim 2, it is characterized in that said CPU also control linkage is useful on the pilot lamp of indicating test mode.

4. strong current generator is used in a kind of relay contact test according to claim 2, it is characterized in that said CPU also imports the connection start-up circuit.

5. strong current generator is used in a kind of relay contact test according to claim 4, it is characterized in that said start-up circuit is artificial button inputting circuits, and circuit output end connects the corresponding input port of said CPU.

6. use strong current generator according to each described a kind of relay contact test among the claim 1-5, it is characterized in that said CPU adopts 32 ARM7 microprocessor LPC2138.