Universal power supply automatic test system

Abstract

The utility model discloses an automatic test system for a universal power supply, and particularly relates to the field of test equipment. Comprising an interface module, a relay array board, a voltage test module, a channel expansion module, a control module, an isolation circuit and a drive circuit, and the output end of the interface module is connected with the output end of the relay array board and the input end of a load. The output voltage of the to-be-tested power supply is divided to the voltage test module for testing and the load for power consumption, so that the test result does not depend on the voltage division effect between the load and the cable, the test accuracy is ensured, and the device can be suitable for a novel electronic load and a traditional resistive load; the control signal is sent to the corresponding signal transmission channel of the channel expansion module through the control module, the relay array board is controlled through the drive circuit, connection between different output channels of the voltage to be tested and the voltage test module is conducted, automatic test of the universal power supply is achieved, manpower is saved, and test efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of test equipment, in particular to a universal power supply automatic test system. BACKGROUND

[0002] The existing multi-channel test is mainly through manual test method, the traditional manual test method is not only inefficient, but also prone to human error, and it is difficult to meet the growing testing demand. The power supply test tool adopts manual voltage pen to test point by point. After testing the first channel, the second channel is tested until all voltages are tested. The test data of the digital voltage meter is read manually and recorded in the data table, and then the power load stability and voltage stability are calculated. The whole process is slow and repetitive, and safety hazards such as positive and negative short circuit and electric shock are prone to occur. This mode not only wastes human resources, but also has low work efficiency. In addition, the existing automatic test method is to use a computer to read the voltage data reported by an electronic load through a serial port to realize data electrification. The disadvantage of this method is that when the power supply current is large, the resistance value of the electronic load is very small, and the resistance of the test cable is not much smaller than the load resistance, which produces a voltage division effect. The data measured by the electronic load has a large error, resulting in poor accuracy. SUMMARY

[0003] The main purpose of the present application is to provide a universal power supply automatic test system, which aims to solve the problem of poor test accuracy in the existing automatic test method.

[0004] To achieve the above purpose, the present application provides a universal power supply automatic test system, which comprises: an interface module, an input end connected to a power supply to be tested, for dividing the output voltage of the power supply to be tested into a test voltage and a load voltage; a relay array board, comprising a plurality of relays, an input end connected to the interface module, for switching the output channel of the test voltage of the power supply to be tested; a voltage test module, an input end connected to the output end of the relay array board, for testing the voltage of any output channel of the relay array board; a channel expansion module, an input end connected to the control module, for increasing the signal transmission channel to a preset number, the preset number being the same as the number of relays; a control module, an output end connected to the channel expansion module, for sending a control signal to each signal transmission channel; an isolation circuit, an input end connected to the output end of the channel expansion module, for isolating the control signals between the signal transmission channels; a driving circuit, an input end connected to the output end of the isolation circuit, an output end connected to each relay, for power amplification and conversion of the control signal of each signal transmission channel, and driving the corresponding relay to conduct.

[0005] Optionally, the isolation circuit comprises a plurality of optoelectronic couplers, each optoelectronic coupler being connected to the output channel of the channel expansion module.

[0006] Optionally, the driving circuit comprises a plurality of triodes, and an input end of each triode is connected to the optocoupler in correspondence, and an output end is connected to the corresponding relay.

[0007] Optionally, the system further comprises a crystal oscillator circuit, and an output end of the crystal oscillator circuit is connected to the control module, so as to provide a reference clock source for the control module.

[0008] Optionally, the crystal oscillator circuit comprises an active crystal oscillator, and the active crystal oscillator is connected to the control module.

[0009] Optionally, the control module is a single-chip microcomputer.

[0010] Compared with the prior art, the application has the following beneficial effects:

[0011] The utility model discloses a general power automatic test system, and the output end of interface module is connected to the output end of relay array board and the input end of load respectively, divides voltage for the voltage test module to the output voltage of the power to be measured and carries out test and power consumption to load, makes the result of test not depend on the voltage division effect between load and cable, guarantees the accuracy of test, can be applicable to new electronic load and traditional resistive load, realizes the automation test of general power through the control signal of control module to the corresponding signal transmission channel of channel expansion module is sent, and the connection of different output channels of voltage to be measured and voltage test module is controlled through driving circuit control relay array board, saves manpower, improves test efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a structure schematic view of a general power automatic test system of the application;

[0013] Figure 2 It is a structure schematic view of a general power automatic test system of the application, and it is the structure schematic view of isolation circuit and driving circuit.

[0014] The application achieves the purpose, functional characteristics and advantages, which will be further described with reference to the drawings. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical scheme and advantages of the application more clear, the technical scheme of the application will be described clearly and completely in combination with the drawings in the application. Obviously, the described embodiments are part of the embodiments of the application, not all. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the application.

[0016] The first embodiment of the application provides a general power automatic test system, which comprises Figure 1As shown, the interface module, the relay array board, the voltage test module, the channel expansion module, the control module, the isolation circuit and the drive circuit are included, wherein the input end of the interface module is connected to the power supply to be tested, and is used to divide the output voltage of the power supply to be tested into a test voltage and a load voltage; the relay array board includes a plurality of relays, and the input end of the relay array board is connected to the interface module, and is used to switch the output channel of the test voltage of the power supply to be tested; the input end of the voltage test module is connected to the output end of the relay array board, and is used to test the output voltage of any channel of the relay array board; the input end of the channel expansion module is connected to the control module, and is used to increase the signal transmission channel to a preset number, and the preset number is the same as the number of relays; the control module is connected to the input end of the channel expansion module, and is used to send a control signal to each signal transmission channel; the input end of the isolation circuit is connected to the output end of the channel expansion module, and is used to isolate the control signals between the signal transmission channels; and the input end of the drive circuit is connected to the output end of the isolation circuit, and the output end is connected to each relay, and is used to power amplify and convert the control signals of the signal transmission channels, and drive the corresponding relays to be turned on.

[0017] In the embodiment, the output end of the interface module is respectively connected to the output end of the relay array board and the input end of the load, the output voltage of the power supply to be tested is divided into the voltage test module for testing and the load for power consumption, so that the test result is not dependent on the voltage division effect between the load and the cable, and the new electronic load and the traditional resistive load can be applied. For example, the control module is a 51 single-chip microcomputer, the 51 single-chip microcomputer receives the channel switching instruction sent by the upper computer, sends a control instruction to the corresponding signal transmission channel according to a preset serial number, controls the corresponding relay to be turned on, and tests the power supply to be tested. Each relay of the relay array board is mainly used for isolation protection, and the relay can isolate the input and output circuits, so that the test voltage of each channel at the output end of the power supply to be tested is isolated from the circuit of the signal transmission channel.

[0018] Further, the crystal oscillator circuit is further included, and the output end is connected to the control module, and is used to provide a reference clock source for the control module. For example, the crystal oscillator circuit includes an active crystal oscillator, and the active crystal oscillator is connected to the control module.

[0019] For example, as shown in Figure 2 As shown, the isolation circuit includes a plurality of optocouplers, and each optocoupler is connected to the signal transmission channel of the channel expansion module. The isolation circuit can prevent interference signals between the signal transmission channels from being transmitted to each other, improve the signal quality, and prevent the high-voltage electrical signal at the test end from directly contacting the low-voltage control end, so as to avoid damage to the control circuit caused by voltage crosstalk.

[0020] The drive circuit comprises a plurality of triodes, the input end of each triode is connected with the photoelectric coupler correspondingly, and the output end is connected with the corresponding relay. The drive circuit is mainly used for power amplification and conversion of the control signal to drive the load to work normally. Since the control signal (weak current signal from the control module) has small power, it cannot directly drive the relay to work. The drive circuit can amplify these signals, provide sufficient current and voltage, and make the power semiconductor device work normally. The drive circuit can provide appropriate on and off signals, and can control the switching speed to ensure that the transistor can work stably and reliably.

[0021] The working principle of the universal power automatic test system is as follows:

[0022] The interface module divides the voltage of the power to be tested, one way is connected to the load for power output, and the other way is connected to the relay array board for testing; the drive circuit is respectively connected with each relay normally open pin; after the single-chip microcomputer receives the start channel switching command sent by the upper computer, the control signal is sent to the first signal transmission channel, the control signal passes through the photoelectric coupler 1 and the triode 1, and the normally open point of the relay 1 is closed, the connection with the voltage test module is turned on, and the test is performed; at the same time, the single-chip microcomputer sends the first channel switching state information to the upper computer; the above process is repeated in turn until the whole channel test is completed.

[0023] The above is only the preferred embodiment of the application, and does not limit the patent scope of the application, and any equivalent structure or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the application.

Claims

1. A universal power supply automatic test system, characterized by, The application relates to a relay array board testing device. The relay array board testing device comprises an interface module, a relay array board, a voltage testing module, a control module, a channel expansion module, an isolation circuit and a driving circuit. The interface module is connected with a power supply to be tested, and is used for dividing the output voltage of the power supply to be tested into a test voltage and a load voltage. The relay array board comprises a plurality of relays, and is connected with the interface module to switch the output channel of the test voltage of the power supply to be tested. The voltage testing module is connected with the output end of the relay array board to test the voltage of any output channel of the relay array board. The control module is used for sending a control signal to each signal transmission channel. The channel expansion module is connected with the control module to increase the signal transmission channels to a preset number, and the preset number is the same as the number of relays. The isolation circuit is connected with the output end of the channel expansion module to isolate the control signals between the signal transmission channels.

2. The universal power supply automatic test system of claim 1, wherein, The driving circuit is connected with the output end of the isolation circuit and each relay to power-amplify and convert the control signals of each signal transmission channel and drive the corresponding relays to be turned on.

3. The universal power supply automatic test system of claim 1, wherein, The isolation circuit comprises a plurality of photoelectric couplers, and each photoelectric coupler is connected with the output channel of the channel expansion module.

4. The universal power supply automatic test system of claim 1, wherein, The driving circuit comprises a plurality of triodes, and the input end of each triode is connected with the photoelectric coupler, and the output end of each triode is connected with the corresponding relay. The relay array board testing device further comprises a crystal oscillator circuit.

5. The universal power supply automatic test system of claim 1, wherein, The crystal oscillator circuit is connected with the control module to provide a reference clock source for the control module.

6. The universal power supply automatic test system of claim 1, wherein, The crystal oscillator circuit comprises an active crystal oscillator connected with the control module. The control module is a 51 single-chip microcomputer.

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