CN202548256U - Short-circuit test device - Google Patents

Abstract

The utility model relates to a short-circuit test device used for testing the short-circuit protection function of a plurality of power supply units in a power supply. The short-circuit test device comprises an oscilloscope, a short-circuit control module and a controller, wherein the oscilloscope is connected to an output terminal of each power supply unit, and the short-circuit control module comprises a plurality of drivers and a plurality of short-circuited circuits; each driver is connected to the controller and is connected to a positive terminal and a negative terminal of the power supply unit through the short-circuited circuit, and the controller is used for controlling a plurality of short-circuited circuits which are in conducting connection with a plurality of drivers so as to short-circuit a plurality of power supply units connected with the conducted short-circuited circuits, and simultaneously used for controlling the oscilloscope to display voltages output by the short-circuited power supply units so as to detect the short-circuit protection function of the power supply units according to the output voltages. The short-circuit function of a plurality of power supply units can be simultaneously tested by the short-circuit test device, and the working efficiency is higher.

Description

Short circuit test device

technical field

The utility model relates to a testing device for electronic components, in particular to a short-circuit testing device for testing the short-circuit protection function of a power supply.

Background technique

It is often necessary to test the short-circuit protection function of the power supply both in the production stage and in daily use. And the existing test method of short-circuit protection function of the power supply is generally to set a mechanical switch at the output end connected to one end of the load on the test fixture (used to convert the voltage output by the power supply into a preset power supply voltage supply to the load), and The test power supply was shorted by manually turning on the switch. However, in this method, noise may be generated at the moment when the switch is turned on, which may distort the waveform of the output voltage of the power supply displayed on the oscilloscope and affect the test results. Carbonization of the contact point affects the test results, and manual operation of the test also makes the efficiency low.

Utility model content

In view of the above situation, it is necessary to provide a short-circuit testing device with high testing accuracy and high operating efficiency.

A short-circuit test device for testing the short-circuit protection function of multiple power supply units in a power supply, the short-circuit test device includes an oscilloscope, a short-circuit control module and a controller, the oscilloscope is connected to the output end of each power supply unit, the The short-circuit control module includes a plurality of drivers and a plurality of short-circuit circuits, each driver is connected to the controller, and is connected to the positive terminal and the negative terminal of a power supply unit through a short-circuit circuit, and the controller controls multiple The driver conducts the connected short-circuit circuit to short-circuit multiple power supply units connected to the conduction short-circuit circuit, and the controller simultaneously controls the oscilloscope to display the output voltage of the short-circuit multiple power supply units, so as to detect the power supply unit according to the output voltage The unit has a short-circuit protection function.

Preferably, the short-circuit test device further includes a test fixture, and the test fixture is provided with multiple sets of input pins and output pins corresponding to a plurality of power supply units, and each set of input pins is connected to a power supply unit, so Each set of output pins is connected to a short circuit.

Preferably, the short-circuit test device further includes an electronic load, which is connected to the test fixture and provides different loads to the power supply through the test fixture to test the load capacity of the power supply.

Preferably, the oscilloscope has multiple channels, and each power supply unit is connected to one channel.

Preferably, the short circuit is an electronic switch.

The short-circuit test device can automatically control the power supply module to effectively be in the short-circuit state through the controller and the short-circuit control module to perform the short-circuit function test, which is more accurate than the short-circuit method using a mechanical switch. In addition, the short-circuit testing device can simultaneously test the short-circuit function of multiple power supply units, and has high working efficiency.

Description of drawings

Fig. 1 is a functional block diagram of the short-circuit testing device of the present invention.

FIG. 2 is a schematic circuit diagram of the short circuit control module shown in FIG. 1 .

Description of main component symbols

Short circuit test device 100 Test Fixture 10 electronic load 30 oscilloscope 50 Short circuit control module 70 driver 71 short circuit 73 controller 90 power supply 200 power supply unit 201

The following specific embodiments will further illustrate the utility model in conjunction with the above-mentioned accompanying drawings.

Detailed ways

Please refer to FIG. 1 , the short-circuit test device 100 of the present invention can be used to test the short-circuit protection function of a power supply 200 , including a test fixture 10 , an electronic load 30 , an oscilloscope 50 , a short-circuit control module 70 and a controller 90 . The power supply 200 is connected to the electronic load 30 through the test fixture 10 , so as to measure the load capacity of the power supply 200 through the load variation of the electronic load 30 . The oscilloscope 50 is connected to the output end of the power supply 200, the controller 90 and the short-circuit control module 70 are connected to the test fixture 10 in turn, and the controller 90 triggers the short-circuit control module 70 to short-circuit the power supply 200, and then through the oscilloscope 50 shows the output voltage of the power supply 200 after short circuit to detect the short circuit protection function of the power supply 200 .

In the embodiment of the present utility model, the power supply 200 has multiple sets of power supply units 201, and each set of power supply units 201 has a positive terminal (+) and a negative terminal (-), and the positive terminal (+) is connected to The negative terminal (-) of the test fixture 10 is grounded. In this embodiment, the short-circuit test device 100 can perform short-circuit protection tests on multiple groups of power supply units 201 at the same time.

The test fixture 10 is used to convert the voltage of each power supply unit 201 of the power supply 200 into a preset supply voltage to supply to the electronic load 30 . The test fixture 10 is provided with multiple sets of input pins (including positive poles and negative poles) and multiple sets of output pins (including positive poles and negative poles) corresponding to the positive poles and negative poles of the plurality of power supply units 201 . The test fixture 10 is connected to the positive end of the power supply unit 201 through the positive poles of the multiple sets of input pins, and is connected to the electronic load 30 and the controller 90 through the positive poles of the output pins, the input pins and the output pins The negative poles of both are grounded. In this way, when a group of output pins of the test fixture 10 are short-circuited (the positive pole is connected to the negative pole and grounded), the power supply unit 201 corresponding to the group of output pins will be in a short-circuit state.

The electronic load 30 is used to make the power supply 200 have loads of different sizes, so as to test the load capacity of the power supply 200 .

The oscilloscope 50 is connected to the positive end of the output of each power supply unit 201 of the power supply 200, and is used to test the output voltage of each power supply unit 201, so as to determine whether the short circuit protection function is activated when the power supply 200 is in a short circuit state through the output voltage. Instead, reduce the voltage to zero. It can be understood that the oscilloscope 50 includes multiple channels, each channel is respectively connected to a power supply unit 201, and the oscilloscope 50 displays the waveform of a certain channel under the control of the controller 90 to confirm the power supply unit 201 corresponding to the channel Whether the short circuit protection function is normal.

The short-circuit control module 70 includes several drivers 71 and several groups of short-circuit circuits 73 . Each driver 71 is connected to the controller 90 and connected to a set of output pins of the test fixture 10 through a short circuit 73 . The driver 71 conducts the short-circuit circuit 73 under the control of the controller 90, so that the positive pole of the power supply unit 201 corresponding to the short-circuit circuit 73 is grounded through the test fixture 10 and the short-circuit circuit 73, and the power supply unit 201 It can be in a short-circuit state to conduct a short-circuit protection function test.

Please also refer to FIG. 2, the driver 71 is composed of two voltage dividing resistors R, and the short-circuit circuit 73 is an electronic switch such as a field effect transistor or a relay. In this embodiment, a field effect transistor is used as an example for illustration . The two voltage dividing resistors R are sequentially connected in series between the controller 90 and the ground. The short circuit 73 is connected between the two voltage divider resistors R through the gate of the field effect transistor, grounded through the source, and connected to the anode of the test fixture 10 through the drain.

The controller 90 is used to control the short-circuit control module 70 to put a certain power supply unit 201 in a short-circuit state. Specifically, when the controller 90 sends a high-level signal to the driver 71, the field effect transistor in the connected short-circuit circuit 73 will be turned on, and the positive end of the power supply unit 201 corresponding to the short-circuit circuit can be The corresponding set of input and output pins in the test fixture 10 and the conduction field effect transistor are grounded to be in a short circuit state. The controller 90 simultaneously controls the oscilloscope 50 to display the waveform of the channel corresponding to the power supply unit 201 in the short-circuit state, so as to detect the short-circuit protection function of the power supply unit 201 through the waveform. The controller 90 can be a data processing device such as a computer or a single chip microcomputer.

When using the short-circuit testing device 100 to perform a short-circuit test on each group of power supply units 201 of the power supply 200, the controller 90 controls the driver 71 corresponding to the power supply unit 201 to be tested to turn on the connected short-circuit circuit 73, so that the corresponding The anode of the power supply unit 201 is grounded through the test fixture 10 and the short-circuit circuit 73 to be in a short-circuit state. The controller 90 simultaneously controls the oscilloscope 50 to display the waveform measured by the channel corresponding to the power supply unit 201 to be tested, and the tester can determine the short-circuit protection function of the power supply unit 201 under test through the waveform. It can be understood that, on the premise that the oscilloscope 50 can display waveforms of multiple channels, the short-circuit test device 100 can perform short-circuit function tests on multiple power supply units 201 at the same time. Specifically, the controller 90 controls the short-circuit control module 70 to short-circuit the plurality of power supply units 201 to be tested, and at the same time controls the oscilloscope 50 to display the waveforms of the plurality of power supply units 201 in the short-circuit state, that is, the voltage displayed by the waveform The short circuit protection function of the plurality of power supply units 201 is determined.

The short-circuit test device 100 of the present invention can automatically control the power supply unit 201 to effectively be in the short-circuit state through the controller 90 and the short-circuit control module 70 to perform a short-circuit function test, which is more accurate than the short-circuit method using a mechanical switch. In addition, the short-circuit test device 100 can perform short-circuit function tests on multiple power supply units 201 at the same time, and the test efficiency is high.

In addition, those skilled in the art can also make other changes within the spirit of the utility model. Of course, these changes made according to the spirit of the utility model should be included in the scope of protection claimed by the utility model.

Claims (5)

1. short-circuit test device; Short-circuit protection function in order to a plurality of power supply units in the testing power supply; It is characterized in that: said short-circuit test device comprises oscillograph, short circuit control die set and controller, and said oscillograph is connected to the output terminal of each power supply unit, and said short circuit control die set comprises a plurality of drivers and a plurality of short circuit current; Said each driver all is connected to controller; And being connected to the positive terminal of a power supply unit through a short circuit current, said controller is controlled the short circuit current that a plurality of driver conductings link to each other, a plurality of power supply units that link to each other with the short circuit current of this conducting with short circuit; Controller is controlled the voltage that oscillograph shows a plurality of power supply units outputs of this short circuit simultaneously, with the short-circuit protection function according to this power supply unit of voltage detecting of this output.

2. short-circuit test device as claimed in claim 1; It is characterized in that: said short-circuit test device also comprises measurement jig; The corresponding a plurality of power supply units of said measurement jig are provided with many group input pins and output pin; Said every group of input pin is connected to a power supply unit, and said every group of output pin all is connected to a short circuit current.

3. short-circuit test device as claimed in claim 2 is characterized in that: said short-circuit test device also comprises electronic load, and said electronic load is connected to measurement jig, and provides different load to power supply, with the load capacity of testing power supply through measurement jig.

4. short-circuit test device as claimed in claim 1 is characterized in that: said oscillograph has multiplexer channel, and each power supply unit is connected to a paths.

5. short-circuit test device as claimed in claim 1 is characterized in that: said short circuit current is an electronic switch.

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