CN221124835U - High-precision electronic load calibration module - Google Patents

Abstract

The utility model aims to provide a high-precision electronic load calibration module for testing and calibrating functions of an electronic load board card before test equipment is assembled. The high-precision electronic load calibration system comprises a power supply module and an upper computer (1), wherein the high-precision electronic load calibration module further comprises a DMM module (2) and a switching module (4), a test end of the DMM module (2) is connected with an output end of an electronic load (5) to be tested, the upper computer (1) is communicated with a processor of the electronic load (5) to be tested through the switching module (4), a memory communicated with the processor is arranged on the electronic load (5) to be tested, the power supply module comprises an isolation power supply module (6) and a power supply (7), the isolation power supply is connected with the electronic load (5) to be tested, and the power supply (7) is connected with the DMM module (2). The utility model is applied to the technical field of circuit detection calibration.

Description

High-precision electronic load calibration module

Technical Field

The utility model is applied to the technical field of circuit detection calibration, and particularly relates to a high-precision electronic load calibration module.

Background

The direct current electronic load is power equipment for testing, is used for simulating various load characteristics to meet the testing requirements of a test product, and can provide load states of various modes such as constant current, constant voltage, constant resistance, dynamic load, short circuit load and the like. And further, the product power supply to be tested is tested, and a load conforming to the testing state is provided for the product power supply to be tested. The equipment for testing the power supply is generally composed of a control circuit, a mechanical structure and an electronic load board card, wherein the equipment is connected with the electronic load board card through the control circuit, and the equipment is used for carrying out simulated load test through the electronic load board card after the mechanical structure finishes product positioning and connection conduction. Because the electronic load board card is used for batch test equipment, the electronic load board card needs to be calibrated before being put into operation, the electronic load function can be detected after the existing equipment needs to be assembled, the calibration data of the electronic load board card system needs to be stored on a main board of the retest equipment, and the electronic load needs to be recalibrated when being replaced, so that the maintenance cost and the maintenance time are increased.

If a device for testing and calibrating the functions of the electronic load board card before assembling the testing equipment can be developed, the assembling efficiency of the testing equipment can be improved well, and the time cost for replacing and maintaining the electronic load board card can be reduced.

Disclosure of utility model

The utility model aims to solve the technical problem of overcoming the defects of the prior art, and provides a high-precision electronic load calibration module for testing and calibrating the functions of an electronic load board card before the assembly of test equipment, so as to improve the assembly efficiency of the test equipment and reduce the time cost of replacing and maintaining the electronic load board card.

The technical scheme adopted by the utility model is as follows: the high-precision electronic load calibration module comprises a power module, an upper computer, a DMM module and a switching module, wherein a test end of the DMM module is connected with an output end of an electronic load to be tested, the upper computer is communicated with a processor of the electronic load to be tested through the switching module, a memory communicated with the processor is arranged on the electronic load to be tested, the power module comprises an isolation power module and a power supply module, the isolation power module is connected with the electronic load to be tested, and the power supply module is connected with the DMM module.

According to the scheme, the DMM module, namely the digital multimeter, is used for collecting the output current of the electronic load to be tested, and meanwhile, the isolated power supply is used as a simulation power supply to interfere and influence the current value of the electronic load. The upper computer is a computer, and is communicated with the processor of the electronic load to be tested through the switching module, so that communication interaction and online calibration are carried out, and the memory connected with the processor of the electronic load is arranged on the electronic load, so that the processor can directly acquire calibration data through the memory after power failure or reinstallation, writing after recalibration is not needed, the process of recalibration of the whole equipment after replacement of the electronic load board card is convenient, and the test efficiency is improved.

In one preferred scheme, the switching module comprises an interface conversion chip, a switching interface and a first power chip, wherein the switching interface is in communication connection with the upper computer through a USB wire, and the switching interface is in communication with a processor of an electronic load to be tested through the interface conversion chip and the first power chip.

The power supply module comprises an isolation power supply unit, a digital signal isolator, a switching power supply chip and a linear voltage stabilizer, wherein the switching power supply chip is connected with the isolation power supply unit, the linear voltage stabilizer is connected with the output end of the switching power supply chip, the digital signal isolator is connected with the output end of the linear voltage stabilizer, and the input port of the digital signal isolator is connected with the output port of the switching module.

Drawings

FIG. 1 is a connection block diagram of the present utility model;

FIG. 2 is a schematic circuit diagram of the patching module;

FIG. 3 is a schematic circuit diagram of the power module;

Fig. 4 is a schematic circuit diagram of the interface group.

Detailed Description

As shown in fig. 1 to 4, in this embodiment, the present utility model includes a power module and an upper computer 1, the high-precision electronic load calibration module further includes a DMM module 2 and a switching module 3, a test end of the DMM module 2 is connected to an output end of an electronic load 4 to be tested, the upper computer 1 communicates with a processor of the electronic load 4 to be tested through the switching module 3, a memory in communication with the processor is disposed on the electronic load 4 to be tested, the power module includes an isolation power module 5 and a power supply module 6, the isolation power module 5 is connected to the electronic load 4 to be tested, and the power supply module 6 is connected to the DMM module 2.

As shown in fig. 2, in this embodiment, the switching module 3 includes an interface conversion chip U3, a switching interface J1, and a first power chip U1, where the switching interface J1 is connected to the host computer 1 by a USB cable, and the switching interface J1 is communicated with the processor of the electronic load 4 to be tested through the interface conversion chip U3 and the first power chip U1. The interface conversion chip U3 is a conversion chip with the model of FT232RL, and the first power chip U1 is a power chip with the model of TPS7A0533 PDBVR. The upper computer 1 is connected with the switching interface J1 through a USB data line and performs signal conversion through the interface conversion chip U3, so that communication with a processor of the electronic load 5 on line is realized, and calibration data is written into a memory. And furthermore, recalibration is not needed after the electronic load is replaced or transferred to other equipment, so that the electronic load can be directly put into use, and the detection time and cost are reduced.

As shown in fig. 3, in this embodiment, the isolation power module 5 includes an isolation power unit, a digital signal isolator U7, a switching power chip U8, and a linear voltage regulator U9, where the switching power chip U8 is connected to the isolation power unit, the linear voltage regulator U9 is connected to an output end of the switching power chip U8, the digital signal isolator U7 is connected to an output end of the linear voltage regulator U9, and an input port of the digital signal isolator U7 is connected to an output port of the switching module 3. The isolation power supply unit is a DCDC isolation power supply with the model of VRA1212ZP-6WR3, and is matched with the switching power supply chip U8 to realize a simulation power supply, so that the electronic load current value is influenced by interference to simulate the actual calibration environment. The digital signal isolator U7 is an isolator chip with the model of ADuM121N0BRZ, the switching power supply chip U8 is a power supply chip with the model of VRA1212ZP-6WR3, and the linear voltage stabilizer U9 is a voltage stabilizer chip with the model of TLV1117-33 IDCYR.

As shown in fig. 4, in this embodiment, the switching module 3 further includes an interface group, and performs switching of signals on each path by connecting the interface group with the electronic load 4 to be tested.

While the embodiments of this utility model have been described in terms of practical aspects, they are not to be construed as limiting the meaning of this utility model, and modifications to the embodiments and combinations with other aspects thereof will be apparent to those skilled in the art from this description.

Claims (3)

1. The utility model provides a high accuracy electronic load calibration module, it includes power module and host computer (1), its characterized in that: the high-precision electronic load calibration module further comprises a DMM module (2) and a switching module (3), wherein the testing end of the DMM module (2) is connected with the output end of the electronic load (4) to be tested, the upper computer (1) is communicated with the processor of the electronic load (4) to be tested through the switching module (3), the electronic load (4) to be tested is provided with a memory communicated with the processor, the power module comprises an isolation power module (5) and a power supply module (6), the isolation power module (5) is connected with the electronic load (4) to be tested, and the power supply module (6) is connected with the DMM module (2).

2. The high precision electronic load calibration module of claim 1, wherein: the switching module (3) comprises an interface conversion chip (U3), a switching interface (J1) and a first power supply chip (U1), wherein the switching interface (J1) is in communication connection with the upper computer (1) through a USB line, and the switching interface (J1) is in communication with a processor of an electronic load (4) to be tested through the interface conversion chip (U3) and the first power supply chip (U1).

3. The high precision electronic load calibration module of claim 1, wherein: the isolation power supply module (5) comprises an isolation power supply unit, a digital signal isolator (U7), a switching power supply chip (U8) and a linear voltage stabilizer (U9), wherein the switching power supply chip (U8) is connected with the isolation power supply unit, the linear voltage stabilizer (U9) is connected with the output end of the switching power supply chip (U8), the digital signal isolator (U7) is connected with the output end of the linear voltage stabilizer (U9), and the input port of the digital signal isolator (U7) is connected with the output port of the switching module (3).