Capability verification device for low power point test of electrical product

Abstract

The invention provides an electrical product low power point test capability verification device, which is characterized in that four test terminals are arranged in a test box, the four test terminals are respectively and correspondingly connected with four test circuits, the four test circuits are respectively and correspondingly provided with four current sensors, the four test terminals are respectively in communication connection with a control port of a single-chip microcomputer, and the single-chip microcomputer is in communication connection with the control port of the single-chip microcomputer. The input voltage and the output voltage of the single-chip microcomputer are both direct current 5V, the single-chip microcomputer sets the four test circuits at power points 15.2 W, 15.1 W, 14.8 W and 14.5 W for protection respectively, the single-chip microcomputer is provided with a state switching module, and the four test circuits are switched through the state switching module; the test box comprises four test terminals for testing four groups of data which are all points with power close to 15W, so that the ability of a laboratory to judge a low-power point is assessed, the technical ability and level of laboratory engineers can be assessed, the difference between the laboratories can be identified, the reproducibility and mutual recognition of detection data between the laboratories are improved, and the test efficiency is improved. And laboratory technical capability improvement is promoted.

Description

Technical Field

[0001] The present invention relates to the technical field of low power point testing, and in particular to a capability verification device for low power point testing of an electrical product. Background Art

[0002] The low power point test of electrical products is a basic test in electrical safety testing, and is also an important test item for CCC certification and medical device registration. With the development of science and technology, electrical products including home appliances, audio and video, power tools, information technology, electric toys, and medical products are becoming more and more intelligent, and the electronic circuits are becoming more and more complex. The existing safety hazards are becoming more and more difficult to be discovered, so the measurement of low power points is becoming more and more important.

[0003] By measuring and finding the low-power points in electronic circuits, not only is the engineer's ability to perform circuit analysis based on the specific routing and component conditions of the product tested, but also the engineer's experience in selecting the correct test points and reasonably building test circuits is examined. When the initial measurement point is not selected properly, continuous trial and adjustment are required. Therefore, this test places high demands on the laboratory's personnel, equipment, and environment. Summary of the invention

[0004] The object of the present invention is to provide a low power point testing device for an electrical product.

[0005] In order to achieve the above object, the technical solution of the present invention is: A low power point test device for an electrical product, characterized in that it comprises a single chip microcomputer, a protection circuit, a peripheral interface circuit and a test box, wherein a first test terminal, a second test terminal, a third test terminal and a fourth test terminal are arranged in the test box, wherein the first test terminal, the second test terminal, the third test terminal and the fourth test terminal are respectively connected to a first test circuit, a second test circuit, a third test circuit and a fourth test circuit, wherein a first current sensor, a second current sensor, a third current sensor and a fourth current sensor are respectively arranged on the first test circuit, the second test circuit, the third test circuit and the fourth test circuit, wherein the first test terminal, the second test terminal, the third test terminal and the fourth test terminal are respectively communicated with a control port of the single chip microcomputer, wherein the input voltage and the output voltage of the single chip microcomputer are both DC 5V, wherein the first test circuit, the second test circuit, the third test circuit and the fourth test circuit are respectively set at power points of 15.2W, 15.1W, 14.8W and 14.5W for protection, wherein the single chip microcomputer is provided with a state switching module, wherein the state switching module is used to switch between the first test circuit, the second test circuit, the third test circuit and the fourth test circuit.

[0006] Furthermore, the protection circuit includes a positive and negative pole reverse connection protection module and a voltage and current protection module.

[0007] Furthermore, the single chip microcomputer is provided with a reset module, an error alarm module and a reset module.

[0008] Furthermore, the single chip microcomputer is provided with an RS485 communication module.

[0009] The present invention designs a capability verification device for low-power point testing of electrical products. The test box of the device includes four test terminals, which test four sets of data, all of which are points with power close to 15W, so as to assess the laboratory's ability to determine low-power points. It is beneficial to assess the technical ability and level of laboratory engineers, and can also identify the differences between laboratories, improve the reproducibility and mutual recognition of test data between laboratories, and promote the improvement of laboratory technical capabilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the system structure of the present invention; Figure 2 It is a peripheral circuit diagram of the single chip microcomputer of the present invention.

[0011] Reference numerals: 1 controller, 2 protection circuit, 3 first test terminal, 4 second test terminal, 5 third test terminal, 6 fourth test terminal, 7 first test circuit, 8 second test circuit, 9 third test circuit, 10 fourth test circuit, 11 a first current sensor, 12 a second current sensor, 13 a third current sensor, 14 is a fourth current sensor, 15 is a fifth terminal. DETAILED DESCRIPTION

[0012] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0013] This embodiment discloses a capability verification device for low power point testing of electrical products, such as Figure 1As shown, it includes a controller 1, a protection circuit 2, a peripheral interface circuit and a test box. The controller 1 adopts an ATmega168V-10AI single-chip microcomputer. The test box is provided with a first test terminal 3, a second test terminal 4, a third test terminal 5 and a fourth test terminal 6. The first test terminal 3, the second test terminal 4, the third test terminal 5 and the fourth test terminal 6 are respectively connected to a first test circuit 7, a second test circuit 8, a third test circuit 9 and a fourth test circuit 10. The first test circuit 7, the second test circuit 8, the third test circuit 9 and the fourth test circuit 10 are respectively provided with a first current sensor 11, a second current sensor 12, a third current sensor 13 and a fourth current sensor 14.

[0014] The first test terminal 3, the second test terminal 4, the third test terminal 5 and the fourth test terminal 6 are respectively connected to the control port of the single-chip microcomputer U1 for communication. The input voltage and output voltage of the single-chip microcomputer U1 are both DC 5V. The first test circuit 7, the second test circuit 8, the third test circuit 9 and the fourth test circuit 10 are respectively set to power points of 15.2W, 15.1W, 14.8W and 14.5W for protection through the single-chip microcomputer U1.

[0015] The single chip microcomputer U1 is provided with a state switching module, through which the first test circuit 7, the second test circuit 8, the third test circuit 9 and the fourth test circuit 10 are switched. The functional state of the state conversion is displayed by the external buttons and indicator lights of the single chip microcomputer U1.

[0016] The protection circuit 2 includes a positive and negative electrode reverse connection protection module and a voltage and current protection module. Figure 2 As shown, the voltage and current protection module includes a set of field effect transistors CJ2310 and a dual MOS power tube FS8205 between the input IN and the output OUT. The set of field effect transistors CJ2310 is used for current control and voltage regulation, and the dual MOS power tube FS8205 is used for overcharge, over discharge and short circuit protection. The voltage and current protection module is connected to the microcontroller U1 through the analog-to-digital converter ADS1110.

[0017] The microcontroller U1 is provided with a reset module, an error alarm module and a reset module, such as Figure 1 As shown, a fifth terminal 15 is further provided in the test box, and the fifth terminal 15 is connected to the reset module Reset and the error alarm module Warning.

[0018] like Figure 2 As shown, the single-chip microcomputer U1 is provided with an RS485 communication module, and the RS485 communication module adopts a MAX485 chip to realize half-duplex RS485 communication of the single-chip microcomputer U1.

[0019] The single-chip microcomputer U1 integrates 6 power measurement logic channels, which correspond to pins 23 to 28 respectively. In this embodiment, the power measurement uses three logic channels of pins 25 to 28. The four power values ​​15.2W, 15.1W, 14.8W, and 14.5W are programmed into the single-chip microcomputer U1 in advance. The positive pole is divided into four paths and sent to four channels for judgment one by one. When the power point triggers which channel, the single-chip microcomputer will give a signal prompt.

[0020] The prompt signal is output through pins 23 and 24, and the user can choose the microcontroller to continue working or cut off and stop working according to the prompt; after stopping working, the user can also choose to reset to let the microcontroller continue.

[0021] like Figure 2 As shown, the single-chip microcomputer U1 has a 5V protection circuit outside, such as a diode D1. When the 5V voltage is too high, the diode D1 breaks down, thereby protecting the electronic components of the entire circuit, especially the single-chip microcomputer U1.

[0022] RS485 level transceiver U2 and analog-to-digital converter U3 work together with auxiliary microcontroller U1 to process the received signal. The first power tube Q1 and the second power tube Q2 perform synchronous rectification. When the input 5V fluctuates, the output adjusts the duty cycle to keep the output at a stable 5V.

[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A capability verification device for low power point testing of electrical products, characterized in that: The invention comprises a single-chip computer, a protection circuit, a peripheral interface circuit and a test box, wherein a first test terminal, a second test terminal, a third test terminal and a fourth test terminal are arranged in the test box, wherein the first test terminal, the second test terminal, the third test terminal and the fourth test terminal are respectively connected to a first test circuit, a second test circuit, a third test circuit and a fourth test circuit, wherein a first current sensor, a second current sensor, a third current sensor and a fourth current sensor are respectively arranged on the first test circuit, the second test circuit, the third test circuit and the fourth test circuit, wherein the first test terminal, the second test terminal, the third test terminal and the fourth test terminal are respectively connected to a control port of the single-chip computer for communication, wherein the input voltage and the output voltage of the single-chip computer are both DC 5V, wherein the first test circuit, the second test circuit, the third test circuit and the fourth test circuit are respectively set at power points of 15.2W, 15.1W, 14.8W and 14.5W for protection, wherein the single-chip computer is provided with a state switching module, wherein the state switching module is used to switch between the first test circuit, the second test circuit, the third test circuit and the fourth test circuit.

2. The low power point test device for electrical products according to claim 1, characterized in that: The protection circuit comprises a positive and negative pole reverse connection protection module and a voltage and current protection module.

3. The low power point test device for electrical products according to claim 1, characterized in that: The single chip microcomputer is provided with a reset module, an error alarm module and a reset module.

4. The low power point test device for electrical products according to claim 1, characterized in that: The single chip microcomputer is provided with an RS485 communication module.

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