CN213689700U

CN213689700U - Automatic test equipment for sensor in box

Info

Publication number: CN213689700U
Application number: CN202022712474.2U
Authority: CN
Inventors: 何梁; 陈上科; 李伟君
Original assignee: Shanghai Leilong Technology Development Co ltd
Current assignee: Shanghai Leilong Technology Development Co ltd
Priority date: 2020-11-22
Filing date: 2020-11-22
Publication date: 2021-07-13
Anticipated expiration: 2030-11-22

Abstract

The utility model discloses an automatic test equipment of incasement sensor, the power distribution box comprises a box body, the inside of box is equipped with computer motherboard, universal meter module, switches module, low frequency test interface, high frequency test interface, CPU, internal memory, hard disk, LCD screen, DVD player, and CPU, internal memory, hard disk, LCD screen and DVD player interconnect with the computer motherboard. According to the automatic testing equipment for the sensor in the box, the relay switching circuit adopts a determinant relay switching control circuit, and only one relay is switched on by a 1x80 relay array in a switching module at one moment, so that the control method greatly saves resources; in order to avoid the influence of the computer mainboard on the universal meter module, the universal meter module adopts a USB isolation communication mode to communicate with the computer mainboard, so that the power line and the communication line of the universal meter module are isolated from the USB interface of the embedded computer.

Description

Automatic test equipment for sensor in box

Technical Field

The utility model relates to an automatic test equipment technical field specifically is an automatic test equipment of incasement sensor.

Background

Because the multimeter module is in direct contact with the sensors inside the box under test, high and low voltage isolation must be ensured; the requirement for IO resources caused by controlling one relay by 1 IO is large, the consumed resources are large, and the cost is increased.

Disclosure of Invention

An object of the utility model is to provide an automatic test equipment of incasement sensor, 1x80 relay array in the switching module only opens a relay constantly, and this kind of control method has greatly saved the resource, has adopted the mode that the communication was kept apart to the USB for the power cord of universal meter module and communication line all keep apart with the USB interface of embedded computer, avoid the influence of embedded computer to the universal meter module, solved the problem among the prior art.

In order to achieve the above object, the utility model provides a following technical scheme: an automatic test device for a sensor in a box comprises a box body, wherein a computer mainboard, a universal meter module, a switching module, a low-frequency test interface, a high-frequency test interface, a CPU, an internal memory, a hard disk, a liquid crystal screen and a DVD player are assembled in the box body, the CPU, the internal memory, the hard disk, the liquid crystal screen and the DVD player are interconnected with the computer mainboard, the universal meter module is communicated with the computer mainboard, the universal meter module is connected with a measurement positive line and a measurement negative line, the measurement positive line and the measurement negative line which are connected with the universal meter module are connected with an input end of the switching module, the low-frequency test interface and the high-frequency test interface are interconnected with the switching module, and the switching module is; the box body is provided with a power interface, and the output end of the power interface is connected to the power module.

Preferably, the switching module is internally integrated with an MCU and a relay array, the output end of the MCU is connected to the relay array by an IO interface, the relay array is interconnected with the low-frequency test interface and the high-frequency test interface, and the input end of the MCU is communicated with the computer mainboard.

Preferably, the power module comprises a power switch, a fuse, an AC/DC isolation module and a DC/DC isolation module, the power switch is connected with 220V alternating current input, the output end of the power switch is connected to the input end of the fuse, the output end of the fuse is connected to the input end of the AC/DC isolation module, the output end of the AC/DC isolation module is connected to the input end of the DC/DC isolation module and to the input ends of the switching module and the computer mainboard, and the output end of the DC/DC isolation module is connected to the input end of the multimeter module.

Preferably, the universal meter module is communicated with the computer mainboard in a USB interface connection mode.

Preferably, the switching module is communicated with the computer mainboard by adopting an RS232 serial bus.

Compared with the prior art, the beneficial effects of the utility model are as follows:

according to the automatic testing equipment for the in-box sensor, the relay switching circuit adopts the determinant relay switching control circuit, and only one relay is switched on by the 1x80 relay array in the switching module at one moment, so that the control method avoids IO resource requirements caused by controlling one relay by 1 IO, and greatly saves resources; the universal meter module adopts a USB interface and an embedded computer for communication, and adopts a USB isolation communication mode for avoiding the influence of a computer mainboard on the universal meter module, so that a power line and a communication line of the universal meter module are isolated from the USB interface of the computer mainboard, and the output of the universal meter module is not influenced by high voltage and interference signals by adopting AC/DC isolation module and DC/DC isolation module two-stage isolation.

Drawings

Fig. 1 is a top view of the present invention;

FIG. 2 is a schematic diagram of the front panel structure of the present invention;

FIG. 3 is a schematic diagram of the structure of the rear panel of the present invention;

FIG. 4 is a schematic diagram of the right panel structure of the present invention;

FIG. 5 is a schematic diagram of the operation of the present invention;

fig. 6 is a schematic diagram of a switching module of the present invention;

fig. 7 is a power module topology of the present invention;

fig. 8 is a schematic diagram of the determinant controlled relay switching of the present invention.

In the figure: 1. a box body; 2. a computer motherboard; 3. a multimeter module; 4. a switching module; 41. MCU; 42. a relay array; 5. a low frequency test interface; 6. a high frequency test interface; 7. a CPU; 8. an internal memory; 9. a hard disk; 10. a liquid crystal screen; 11. a DVD player; 12. a power supply module; 121. a power switch; 122. a fuse; 123. an AC/DC isolation module; 124. a DC/DC isolation module.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-8, an automatic testing device for a sensor in a box comprises a box body 1, a computer motherboard 2, a multimeter module 3, a switching module 4, a low-frequency testing interface 5, a high-frequency testing interface 6, a CPU7, an internal memory 8, a hard disk 9, a liquid crystal screen 10, a DVD player 11 are assembled in the box body 1, the CPU7, the internal memory 8, the hard disk 9, the liquid crystal screen 10 and the DVD player 11 are interconnected with the computer motherboard 2, the multimeter module 3 is in communication with the computer motherboard 2 by means of USB interface connection, and is used for controlling the multimeter module 3 to execute various tests and feed back test data, the multimeter module 3 is connected with a positive measuring line and a negative measuring line, the positive measuring line and the negative measuring line connected with the multimeter module 3 are connected to an input end of the switching module 4, the low-frequency testing interface 5 and the, the switching module 4 is communicated with the computer mainboard 2, and the switching module 4 is communicated with the computer mainboard 2 by adopting an RS232 serial bus and is used for controlling the switching module 4 to switch a measurement positive line and a measurement negative line; the box body 1 is provided with a power interface, and the output end of the power interface is connected to the power module 12.

Referring to fig. 5, the switching module 4 is integrated with an MCU41 and a relay array 42, an output terminal of the MCU41 is connected to the relay array 42 through an IO interface, the relay array 42 is interconnected with the low frequency test interface 5 and the high frequency test interface 6, and an input terminal of the MCU41 is in communication with the computer motherboard 2 through an RS232 serial bus.

The switching module 4 mainly performs the following operations:

1. the RS232 communication port is arranged to realize communication with the embedded computer;

2. with 1x80 switching array;

3. the switching of the four-wire system measurement is realized;

4. and switching control of the relay is realized.

The switching module 4 mainly comprises 1 relay switching array (two switching modules 4 are arranged in the equipment, one is used for switching and measuring a positive line, and the other is used for switching and measuring a negative line) and an MCU41, wherein the capacity of the relay switching array is 1x80, and the relay switching array can be divided into 30 low-frequency test points, 25 high-frequency test points and 25 high-frequency shielding test points.

MCU41 passes through RS232 communication with computer motherboard 2, receives embedded computer command, and control a relay in every relay array to switch on respectively, with the cooperation test, 8 high reliability singlechips are selected for use to switch module 4's treater, switch module 4's switching adopts the relay, its electric life is about 10 ten thousand times, mechanical life is about 1 hundred million times, because the electric current that passes through relay in the test is minimum (be less than or equal to 1 mA), therefore its life-span is similar to mechanical life, need not to consider relay life problem basically.

The relay switching circuit adopts a determinant relay switching control circuit, and the 1x80 relay array 42 in the switching module 4 only opens one relay at one moment, so that the control method avoids the IO resource requirement caused by controlling one relay by 1 IO, and greatly saves resources.

Referring to fig. 6, the power module 12 includes a power switch 121, a fuse 122, an AC/DC isolation module 123 and a DC/DC isolation module 124, the power switch 121 is connected to a 220V AC input, an output terminal of the power switch 121 is connected to an input terminal of the fuse 122, an output terminal of the fuse 122 is connected to an input terminal of the AC/DC isolation module 123, an output terminal of the AC/DC isolation module 123 is connected to an input terminal of the DC/DC isolation module 124 and to input terminals of the switching module 4 and the computer motherboard 2, and an output terminal of the DC/DC isolation module 124 is connected to an input terminal of the multimeter module 3.

The AC/DC isolation module 123 converts AC220V power into DC12V power, the DC/DC isolation module 124 specially supplies power for the multimeter module 3, because the multimeter module 3 is directly contacted with a sensor in a tested box, high voltage and low voltage isolation must be ensured, and the two-stage isolation of the AC/DC isolation module 123 and the DC/DC isolation module 124 ensures that the output of the multimeter module 3 is not influenced by high voltage and interference signals.

In summary, the following steps: according to the automatic test equipment for the in-box sensor, the relay switching circuit adopts a determinant relay switching control circuit, and only one relay is switched on by the 1x80 relay array 42 in the switching module 4 at one moment, so that the control method avoids IO resource requirements caused by controlling one relay by 1 IO, and greatly saves resources; universal meter module 3 adopts the communication of USB interface and computer motherboard 2, for avoiding computer motherboard 2 to universal meter module 3's influence, has adopted the mode that USB kept apart the communication for universal meter module 3's power cord and communication line all keep apart with computer motherboard 2's USB interface, adopt AC/DC to keep apart module 123 and DC/DC to keep apart module 124 two-stage and keep apart and guarantee that universal meter module 3's output does not receive high pressure and interference signal to influence.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an automatic test equipment of incasement sensor, includes box (1), its characterized in that: a computer mainboard (2), a universal meter module (3), a switching module (4), a low-frequency test interface (5), a high-frequency test interface (6), a CPU (7), an internal memory (8), a hard disk (9), a liquid crystal screen (10) and a DVD player (11) are assembled in the box body (1), the CPU (7), the internal memory (8), the hard disk (9), the liquid crystal screen (10) and the DVD player (11) are interconnected with the computer mainboard (2), the universal meter module (3) is communicated with the computer mainboard (2), the universal meter module (3) is connected with a measurement positive line and a measurement negative line, the measurement positive line and the measurement negative line which are connected with the universal meter module (3) are connected with the input end of the switching module (4), the low-frequency test interface (5) and the high-frequency test interface (6) are interconnected with the switching module (4), and the switching module (4) is communicated with the computer mainboard (2); the box body (1) is provided with a power interface, and the output end of the power interface is connected to the power module (12).

2. The automated in-box sensor testing device of claim 1, wherein: MCU (41) and relay array (42) are integrated in the switching module (4), the output end of MCU (41) is connected to relay array (42) by IO interface, relay array (42) is interconnected with low frequency test interface (5) and high frequency test interface (6), MCU (41) is communicated with computer mainboard (2).

3. The automated in-box sensor testing device of claim 1, wherein: the power supply module (12) comprises a power switch (121), a fuse (122), an AC/DC isolation module (123) and a DC/DC isolation module (124), wherein the power switch (121) is connected with 220V alternating current input, the output end of the power switch (121) is connected to the input end of the fuse (122), the output end of the fuse (122) is connected to the input end of the AC/DC isolation module (123), the output end of the AC/DC isolation module (123) is connected to the input end of the DC/DC isolation module (124) and the input ends of a switching module (4) and a computer mainboard (2), and the output end of the DC/DC isolation module (124) is connected to the input end of a multimeter module (3).

4. The automated in-box sensor testing device of claim 1, wherein: the universal meter module (3) is communicated with the computer mainboard (2) in a USB interface connection mode.

5. The automated in-box sensor testing device of claim 1, wherein: and the switching module (4) is communicated with the computer mainboard (2) by adopting an RS232 serial bus.