CN203084157U - Testing system of current sensor - Google Patents

Abstract

The utility model proposes a test system for a current sensor, which includes multiple current sensors, multiple input control devices, a signal generating device, multiple output control devices and a test device. Wherein, each of the multiple current sensors has a test input terminal and a test output terminal; a signal generating device, the signal generating device generates an input signal; each of the multiple input control devices is connected to a test input terminal of a current sensor; multiple Each of the output control devices is respectively connected to the test output end of one of the current sensors; the test device is connected to multiple output control devices, and the test device tests the multiple current sensors according to the signals output from the test output terminals. By adopting the testing system of the current sensor of the utility model, the testing time can be saved, the production efficiency can be improved, and the production cost can be reduced.

Description

A testing system for current sensor

technical field

The utility model relates to the technical field of testing, in particular to a testing system of a current sensor.

Background technique

The current test method for the PCBA (Printed Circuit Board+Assembly) of the current sensor is as follows: first, a signal is input to the PCBA of the current sensor through the signal generator, the input signal is output after passing through the PCBA, and the output signal is transmitted to the oscilloscope , observe whether the waveform on the oscilloscope is attenuated, and then use a PC (personal computer, personal computer) to obtain the signals collected by the oscilloscope for calculation and comparison, and check whether the results meet the requirements. Among them, the signal generator is an instrument that generates the electrical test signal of the required parameters. According to the signal waveform, it can be divided into four categories: sine signal, function signal, pulse signal and random signal generator. An oscilloscope is a widely used electronic measuring instrument. It can convert invisible electrical signals into visible images, which is convenient for people to study the changing process of various electrical phenomena.

The above-mentioned PCBA test method for the current sensor is too single, and a single test can only be carried out on one PCB (Printed Circuit Board, printed circuit board) board in the PCBA assembly. Each test requires personnel to use the specified test fixture for accurate contact testing The corresponding position on the board and the strength should be moderate, otherwise the test will be inaccurate or the PCB board will be damaged. After testing a PCB board, it needs to be disconnected and then connected to the next PCB board. The operation process needs to be completed manually, and there are 20 PCB test boards with the same structure in the whole PCBA, so this test method is too complicated and time-consuming. The production efficiency is greatly reduced and the input cost is increased.

Utility model content

The purpose of this utility model is to at least solve one of the above-mentioned technical defects.

For this reason, the purpose of this utility model is to propose a test system of a current sensor. By adopting the test system of this utility model, test time is saved, production efficiency is improved, and production cost is reduced.

In order to achieve the above object, the embodiment of the utility model proposes a test system of a current sensor, comprising: a plurality of current sensors, each of which has a test input terminal and a test output terminal; a signal generating device, The signal generating device generates an input signal; a plurality of input control devices, each of which is respectively connected to the test input end of one of the current sensors; a plurality of output control devices, the plurality of output control devices Each of the output control devices is respectively connected to the test output of one of the current sensors; and a test device, the test device is connected to the plurality of output control devices, and the test device is respectively based on the The output signal tests the plurality of current sensors.

According to the testing system of the current sensor of the embodiment of the utility model, through the selection of the input and output signal channels of the multiple current sensors by multiple input control devices and multiple output control devices, multi-channel signal control is realized, and continuous testing can be performed at one time. Test, simplifies the test steps, improves the automation of the test, and reduces the cost.

Additional aspects and advantages of the present invention will be set forth in part in the description which follows, and part will be apparent from the description which follows, or can be learned by practice of the present invention.

Description of drawings

The above-mentioned and/or additional aspects and advantages of the utility model will become apparent and easy to understand from the following description of the embodiments in conjunction with the accompanying drawings, wherein:

Fig. 1 is a schematic structural diagram of a testing system of a current sensor according to an embodiment of the present invention;

Fig. 2 is a schematic structural diagram of a testing system of a current sensor according to an embodiment of the present invention;

Fig. 3 is the flow chart of the working process of the testing system of current sensor according to an embodiment of the present invention;

Fig. 4 is a schematic diagram of the working connection of a bidirectional COMS analog switch according to an embodiment of the present invention;

Fig. 5 is the flow chart that PCBA is tested according to an embodiment of the present utility model; And

Fig. 6 is a schematic diagram of a test software interface display according to an embodiment of the present invention.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, and are only used to explain the present invention, and cannot be construed as limiting the present invention.

The following disclosure provides many different embodiments or examples for realizing different structures of the present invention. To simplify the disclosure of the present invention, components and arrangements of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the utility model. Furthermore, the present invention may repeat reference numerals and/or letters in different instances. This repetition is for the purpose of simplicity and clarity and does not in itself indicate a relationship between the various embodiments and/or arrangements discussed. In addition, various specific process and material examples are provided herein, but one of ordinary skill in the art will recognize the applicability of other processes and/or the use of other materials. Additionally, configurations described below in which a first feature is "on" a second feature may include embodiments where the first and second features are formed in direct contact, and may include additional features formed between the first and second features. For example, such that the first and second features may not be in direct contact.

In the description of the present utility model, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be The internal communication between two elements may be direct connection or indirect connection through an intermediary. Those of ordinary skill in the art can understand the specific meanings of the above terms according to specific situations.

These and other aspects of embodiments of the present invention will become apparent with reference to the following description and drawings. In these descriptions and drawings, some specific implementations of the embodiments of the present invention are specifically disclosed to represent some ways of implementing the principles of the embodiments of the present invention, but it should be understood that the embodiments of the present invention The range is not limited by this. On the contrary, the embodiments of the present invention include all changes, modifications and equivalents falling within the spirit and scope of the appended claims.

The testing system of the current sensor according to the utility model is described below with reference to the accompanying drawings.

As shown in FIG. 1 , the current sensor testing system of the embodiment of the present invention includes: multiple current sensors 101 , a signal generating device 102 , multiple input control devices 103 , multiple output control devices 104 and a testing device 105 . Wherein, each of the plurality of current sensors 101 has a test input terminal I and a test output terminal O. The signal generator 102 generates an input signal. Each of the plurality of input control devices 103 is respectively connected to a test input terminal I of a current sensor. Each of the plurality of output control devices 104 is respectively connected to a test output terminal O of a current sensor. The test device 105 is connected to multiple output control devices 104, and the test device 105 tests the multiple current sensors 101 according to the signals output from the test output terminal O respectively.

Further, as shown in FIG. 2, in one embodiment of the present invention, the testing system of the current sensor further includes a controller 201, and the controller 201 is respectively connected to a plurality of input control devices 103 and a plurality of output control devices 104, The controller 201 controls the plurality of input control devices 103 and the plurality of output control devices 104 .

As shown in Figure 3, in an embodiment of the present invention, the working process of the test system of the current sensor comprises the following steps:

S301 , the signal generating device 102 generates a signal, and transmits the signal to a plurality of input control devices 103 .

S302, the controller 201 controls the multiple input control devices 103 to select a connection channel.

After the multiple input control devices 103 receive the input signal, the controller 201 sends out a control signal to control the multiple input control devices 103 to select the channel to be connected, and different channels correspond to different locations for testing.

S303 , the multiple input control devices 103 transmit signals to the test input terminals I of the multiple current sensors 101 , and the signals are output to the multiple output control devices 104 through the multiple current sensors 101 .

S304, the controller 210 controls the multiple output control devices 103 to output the signals of the multiple current sensors 101 .

The signals are output to multiple output control devices 103 through the test output terminals O of multiple current sensors 101, and the controller 201 controls the multiple output control devices 103 to select corresponding channels and output signals.

S305, the testing device 105 tests the output signals of the multiple output control devices 103 .

The output signals of multiple output control devices 103 are tested by the testing device 105, and then the test signals are analyzed and calculated to obtain whether the current sensor meets the production requirements.

As shown in Figure 4, in one embodiment of the present utility model, each of a plurality of input control devices 103 and a plurality of output control devices 104 is composed of a bidirectional CMOS (Complementary MetalOxide Semiconductor, Complementary Metal Oxide Semiconductor) switch . The bidirectional CMOS switch can selectively connect channels, which is equivalent to a switch that controls the on-off of available signals, and can realize multi-channel signal control.

In another embodiment of the present utility model, the test device 105 can be an oscilloscope 401, and the controller 201 can be a single-chip microcomputer 402. The single-chip microcomputer 402 refers to the CPU (Central Processing Unit, central processing unit), RAM (random access memory, random access memory), ROM (Read-Only Memory, read-only memory), timer counter and various I/O interfaces are integrated on a chip to form a chip-level computer. The single-chip microcomputer 402 can perform different combinations of controls for different applications. Taking the printed circuit board assembly PCBA test as an example, as shown in Figure 4, three groups of bidirectional COMS analog switches, bidirectional COMS analog switch 1 and bidirectional COMS analog switch 2 as the first group, bidirectional COMS analog switch 3 and bidirectional COMS analog switch 4 As the second group, the bidirectional COMS analog switch 5 and the bidirectional COMS analog switch 6 are used as the third group, and A0, A1, and A2 of each bidirectional COMS analog switch are address bits, which are connected to the output I/O port of the single-chip microcomputer 402, such as three Address bits A0 , A1 , A2 of the group of bidirectional CMOS analog switches are all connected to ports PTA0 , PTA1 , and PTA2 of the single-chip microcomputer 402 . The microcontroller 402 sends high and low level control signals. EN0, EN1, and EN2 are the enable terminals of the three groups of bidirectional COMS analog switches, which are always at low level. terminal, connected with the signal generating device 102, D10, D11, D12 are the public ends of the bidirectional COMS analog switch 2, bidirectional COMS analog switch 4 and bidirectional COMS analog switch No. 6 switch, connected with the oscilloscope 401, bidirectional COMS analog switch 1, S1~S8 ports of bidirectional COMS analog switch 3 and bidirectional COMS analog switch No. 5 are respectively connected to the test input terminal I of each PCB board, S1 The ~S8 port is connected to the test output terminal O of each PCB board respectively.

In one embodiment of the present utility model, adopt the test system of the present utility model to the process of PCBA test, as shown in Figure 5, comprise the following steps:

S501, the signal generating device 102 generates a signal.

S502, the PC sends a control signal to the single-chip microcomputer 402, and the single-chip microcomputer 402 controls a plurality of input bidirectional COMS analog switches to select channels, and the conducted channels transmit signals to corresponding PCB boards.

When the signal generating device 102 generates an input signal, the PC sends a control signal to the single-chip microcomputer 402, and the single-chip microcomputer 402 controls the bidirectional COMS analog switch to perform channel selection. The channel selection of the bidirectional COMS analog switch is determined according to the truth table shown in Table 1 below, using " 0" stands for low level, and "1" stands for high level.

Table 1

A2 A1 A0 EN switch condition 0 0 0 0 1 0 0 1 0 2 0 1 0 0 3 0 1 1 0 4

1 0 0 0 5 1 0 1 0 6 1 1 0 0 7 1 1 1 0 8

As shown in Table 1, when the MCU sends the control signal "000", the S1 channels of bidirectional COMS analog switch 1 and bidirectional COMS analog switch 2 are turned on, so that different combinations of address bits and enable bits correspond to different The channel is turned on, so that different PCB boards in the PCBA are selected for testing.

S503 , the signal passes through the PCBA, and the single-chip microcomputer 402 controls a plurality of bidirectional COMS analog switches to select a channel and output the signal to the oscilloscope 401 .

After the signal passes through the PCBA, it reaches the bidirectional COMS analog switch. The single-chip microcomputer 402 controls the switch to select a channel. The bidirectional COMS switch performs channel selection in the same way as step S502, and sends the output signal to the oscilloscope 401.

S504, observe whether the waveform of the signal received by the oscilloscope 401 is attenuated, and at the same time, the oscilloscope 401 transmits the signal to the PC.

S505, configuring the parameters of the PC test software, and performing calculation and comparison.

Configure the relevant parameters of the test software on the PC. The interface of the test software is shown in Figure 6. The corresponding device port 601 and product model 602 should be selected for the test interface. The primary side signal channel 603 and product output channel 604 are controlled by the software. It is specified by itself, so there is no need to re-select. First, determine whether the value of the primary signal 605 is correct. The theoretical value 606 corresponding to each product is fixed. Check the value of the product output 607 and the value of the error 608. The error 608 is determined by Subtract the theoretical value 606 from the product output 607 value, determine whether the error 608 is within the allowable range, and finally check the test result 609 to judge whether the product is qualified.

It can be seen from the test process carried out by this test system that it is only necessary to put the PCBA to be tested into the test fixture, configure each test parameter, and combine the software and hardware to realize the online test of the PCBA. During the test, check whether the test result 609 on the test software interface is normal, and then determine whether the product is qualified. In addition, the entire PCBA can be tested continuously at one time, saving time. In addition, the system structure is simple and easy to implement.

According to the testing system of the current sensor of the embodiment of the utility model, the selection of the input and output signal channels of the multiple current sensors by the controller controls a plurality of input control devices and a plurality of output control devices realizes multi-channel signal control and can perform One-time continuous testing shortens the time spent on connecting the test board and disconnecting it to test another board in production, simplifies the test steps, saves manpower and material resources, improves the automation of the test, and reduces the cost.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structures, materials or features are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes and modifications can be made to these embodiments without departing from the principle and spirit of the present invention , replacements and modifications, the scope of the present utility model is defined by the appended claims and their equivalents.

Claims (5)

1. the test macro of a current sensor is characterized in that, comprising:

A plurality of current sensors, each of described a plurality of current sensors all have test input and test output terminal;

Signal generation apparatus, described signal generation apparatus produces input signal;

A plurality of input control devices, each of described a plurality of input control devices link to each other with the described test input of a described current sensor respectively;

A plurality of output-controlling devices, each of described a plurality of output-controlling devices link to each other with the described test output terminal of a described current sensor respectively; And

Proving installation, described proving installation links to each other with described a plurality of output-controlling devices, and described proving installation is tested described a plurality of current sensors according to the signal of described test output terminal output respectively.

2. the test macro of current sensor as claimed in claim 1 is characterized in that, described proving installation is an oscillograph.

3. the test macro of current sensor as claimed in claim 1 is characterized in that, also comprises:

Controller, described controller link to each other with a plurality of output-controlling devices with described a plurality of input control devices respectively, and described controller is controlled described a plurality of input control devices and a plurality of output-controlling device.

4. the test macro of current sensor as claimed in claim 1 is characterized in that, each in described a plurality of input control devices and a plurality of output-controlling device is made of two-way cmos switch respectively.

5. the test macro of current sensor as claimed in claim 1 is characterized in that, described test is printed circuit-board assembly PCBA test.

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