CN202522687U

CN202522687U - Detection device of frequency converter power supply board

Info

Publication number: CN202522687U
Application number: CN 201220112945
Authority: CN
Inventors: 刁新文
Original assignee: Guangzhou Sanjing Electric Co Ltd
Priority date: 2012-03-22
Filing date: 2012-03-22
Publication date: 2012-11-07
Anticipated expiration: 2022-03-22

Abstract

The utility model provides a detection device of a frequency converter power supply board. The detection device is efficient and accurate, and is low in cost. The detection device includes a CPU module, a signal voltage dividing circuit, and a driving signal detection module, a voltage detection simulation isolation module, and a signal selection module which are connected with the CPU module respectively. The signal voltage dividing module is connected with the signal selection module and the voltage detection simulation isolation module respectively via relays of the power supply board. The detection device of the frequency converter power supply board realizes the automation of the production test, saves the testing time, greatly increases the efficiency, and saves a big amount of manpower and material resources.

Description

A kind of pick-up unit of converter power supply plate

Technical field

The utility model relates to the frequency converter field tests of dispatching from the factory, particularly a kind of pick-up unit of converter power supply plate.

Background technology

Converter power supply plate voltage constitutes complicated; Totally 18 groups of voltages; Be respectively+5V ,+15V ,-15V ,+24V, temperature detection signal and brake voltage signal, and UVW go up mutually each 1 group of bridge 22V, UVW descend mutually each 1 group of bridge 22V, UVW go up mutually bridge with under respectively 1 group of bridge drive signal.

18 groups of voltages have 10 earth signals altogether, also need test the Dead Time of 6 driving photo-couplers, the 24V short-circuit test in 2 seconds, and difficulty of test is big.If adopt the manual testing, method is generally uses multimeter to test 18 groups of voltages, and oscillograph test Dead Time waste time and energy, and error is uncontrollable, can produce the test leakage mistake unavoidably and survey, if adopt instrumentation to test then cost is expensive, difficult in maintenance.

The utility model content

The shortcoming that the purpose of the utility model is to overcome existing testing scheme is with not enough; A kind of pick-up unit of efficient converter power supply plate accurate, with low cost is provided, has realized the robotization of production test, saved the test duration; Raise the efficiency greatly, practice thrift lot of manpower and material resources.

The purpose of the utility model realizes through following technical proposals: a kind of pick-up unit of converter power supply plate; Comprise CPU module, signal division module; And the drive signal detection module that is connected with the CPU module respectively, voltage detecting simulation isolation module and signal selection module, said signal division module is connected with signal selection module, voltage detecting simulation isolation module respectively through the relay of power panel.

Said CPU module also is connected with the insulated gate bipolar transistor IGBT of power panel.

Said drive signal detection module adopts photo-coupler; The drive signal of the insulated gate bipolar transistor IGBT of power panel is transferred to the CPU module after isolating through photo-coupler.

The pick-up unit of above-mentioned converter power supply plate further comprises the serial communication modular, the key-press module that are connected with the CPU module.

Said key-press module comprises 1 reset key and 1 feeler switch.

Said serial communication modular is the RS232 communication interface.

Said signal division module is a divider resistance.

Said divider resistance is imported the CPU module to voltage signal conversion to be measured back by 0.1 scale-up factor.

The detection principle of the utility model is:

1, tested voltage is divided into 0 to 3V through precision resister, delivers to the AD pin of CPU again through voltage detecting simulation isolation module, has realized not the detection of the signal on ground altogether like this, and the test back is through the tested voltage of electric resistance partial pressure coefficient calculations;

2, because the AD mouth of CPU is limited; Per 1 road signal connects a relay; Gather at last 1 the road be connected to CPU the AD pin, any moment has only No. 1 relay gating, CPU selects test signal; 18 groups of voltages are delivered to CPU sequentially successively and are detected, and so only need one group of simulation photoelectric coupled circuit just can realize;

3, the insulated gate bipolar transistor IGBT drive signal is connected to the IO mouth of CPU through 6 groups of 6N137 photo-couplers, detects Dead Time;

4, the 24V short-circuit test is confirmed through the variation of each road signal of closed off period of relay;

5, the test manually key mode also can pass through PC control, test result is delivered to host computer through the RS232 interface, shows through host computer;

6, limited because of the IO pin number of CPU, the IO mouth and the convenient programming of be saving CPU through 2 74HC595 registers of spi bus control, realize that 4 IO pins control 18 road voltage signals.

Can know that based on above-mentioned test philosophy the utility model has following advantage and effect with respect to prior art:

1, the utility model has been saved the test duration because of realizing the robotization of production test, raises the efficiency greatly, practices thrift lot of manpower and material resources;

2, the utility model cost is low, and testing result is accurate.

Description of drawings

Fig. 1 is the schematic diagram of the utility model;

Fig. 2 is the utility model voltage detecting simulation isolation module;

Fig. 3 is the drive signal detection module of the utility model.

Embodiment

Below in conjunction with embodiment and accompanying drawing the utility model is described in further detail, but the embodiment of the utility model is not limited thereto.

Embodiment

Referring to Fig. 1; The utility model comprises CPU module, signal division module; And the drive signal detection module that is connected with the CPU module respectively, voltage detecting simulation isolation module, serial communication modular, key-press module, power module and signal selection module, said signal division module is connected with signal selection module, voltage detecting simulation isolation module respectively through 18 relays of power panel.The CPU module also is connected with 6 insulated gate bipolar transistor IGBTs of power panel.

It is master controller that CPU module, present embodiment adopt the LM3S611 of high-performance CORTEX M3 kernel, realizes the PWM output of band dead band control, ultra high speed A, high-speed capture, SPI (high-speed synchronous serial port), UART functions such as (universal asynchronous reception transmissions).

Like Fig. 2, the isolation that voltage detecting simulation isolation module is realized CPU module and signal-under-test can realize not the test of the signal on ground altogether like this, and 18 relay outputs all are connected to the VIN1 interface, has so just realized that the serial of multiple signals detects.

The drive signal of insulated gate bipolar transistor IGBT has strict demand to Dead Time, generally has only several microseconds, and bridge short circuit more up and down will be if short circuit will cause serious consequences such as frequency converter aircraft bombing.Like Fig. 1, shown in 3; The drive signal detection module adopts 6 groups of 6N137 photo-couplers; Deliver to the CPU module after isolating through 6 groups of photo-couplers respectively from the drive signal of 6 groups of insulated gate bipolar transistor IGBTs of power panel, the CPU module obtains Dead Time through scanning.

The signal division module select precision resister according to a certain percentage coefficient convert voltage signal to be measured to the CPU module and can 0 arrive 3V voltage through what the AD modular converter detected; If sensing range is the voltage of 0V to 30V, scale-up factor is 0.1 so, and virtual voltage corresponding when promptly the AD of CPU detects 1.5V is 15V, and every road signal adopts suitable divider resistance to realize.

The CPU module by signal selection module through spi bus 18 relay groups of power panel gating one by one in order, any moment has only 1 road signal to be communicated with voltage detecting simulation isolation module, has so just realized the serial detection of multiple signals.

Serial communication modular, key-press module have been formed the man-machine interaction part.2 buttons have been designed on the key-press module, 1 reset key and 1 feeler switch; Serial communication modular adopts the RS232 communication interface, and test board can be connected with computer through Serial Port Line, and the startup that can control test through host computer stops, and test result directly is shown to computer screen, comes into plain view.

The testing process of the utility model is following:

1, the dead band is detected.Power panel drives the drive signal dead band of optocoupler and has only 4 microseconds; Detection is harsh to time requirement, and this speed to processor proposes very high requirement, so use the CPU of 32 cortex m3 kernel; And adopt assembly language to write the code that the dead band is detected; Through not stopping to scan the input pin that connects drive signal, measure Dead Time, see whether within the testing standard scope;

2,24V short-circuit detecting.CPU pilot relay handle+24V is with 5 seconds of ground short circuit, see short circuit after the power panel works normal;

3, the amplitude of 18 groups of voltage signals of test is+5V+15V ,-15V respectively; + 24V, temperature detection signal, brake voltage signal, UVW go up each 1 group of bridge 22V mutually; UVW descends each 1 group of bridge 22V mutually, and UVW goes up bridge mutually with each 1 group of following bridge drive signal, and CPU is through 2 74HC595 of spi bus control, and then control does not have the break-make of not individual signal relay; A gating 1 road signal of any moment is delivered to CPU and is detected, and obtains magnitude of voltage through the AD conversion, and then contrast just can draw test result with testing standard.

The foregoing description is the utility model preferred implementation; But the embodiment of the utility model is not restricted to the described embodiments; Other any do not deviate from change, the modification done under spirit and the principle of the utility model, substitutes, combination, simplify; All should be the substitute mode of equivalence, be included within the protection domain of the utility model.

Claims

1. the pick-up unit of a converter power supply plate; It is characterized in that; Comprise CPU module, signal division module; And the drive signal detection module that is connected with the CPU module respectively, voltage detecting simulation isolation module and signal selection module, said signal division module is connected with signal selection module, voltage detecting simulation isolation module respectively through the relay of power panel.

2. the pick-up unit of converter power supply plate according to claim 1 is characterized in that, said CPU module also is connected with the insulated gate bipolar transistor IGBT of power panel.

3. the pick-up unit of converter power supply plate according to claim 1 is characterized in that, said drive signal detection module adopts photo-coupler; The drive signal of the insulated gate bipolar transistor IGBT of power panel is transferred to the CPU module after isolating through photo-coupler.

4. the pick-up unit of converter power supply plate according to claim 1 is characterized in that, further comprises the serial communication modular, the key-press module that are connected with the CPU module.

5. the pick-up unit of converter power supply plate according to claim 4 is characterized in that, said key-press module comprises 1 reset key and 1 feeler switch.

6. the pick-up unit of converter power supply plate according to claim 4 is characterized in that, said serial communication modular is the RS232 communication interface.

7. the pick-up unit of converter power supply plate according to claim 1 is characterized in that, said signal division module is a divider resistance.

8. the pick-up unit of converter power supply plate according to claim 7 is characterized in that, said divider resistance is imported the CPU module to voltage signal conversion to be measured back by 0.1 scale-up factor.