Test tool and test system

Abstract

The invention discloses a test tool and a test system. The test tool comprises an input end, a first test circuit, a second test circuit, a control circuit and an output end, the first test circuit and the second test circuit are connected in parallel between the input end and the output end; the input end is connected with an external power supply, and the output end is electrically connected with to-be-tested equipment; the control circuit is used for controlling on-off of the test circuit. The test tool only allows one test circuit to be conducted at the same time; the first test circuit comprises a safety test unit, and the second test circuit comprises a power conversion unit; when the first test circuit is switched on, the safety test unit is used for carrying out safety test on the to-be-tested equipment; and when the second test circuit is switched on, the power supply conversion unit is used for converting the external power supply into a target power supply matched with the to-be-tested equipment, so that the to-be-tested equipment is subjected to an operation test. The tool can automatically realize the safety test and the operation test of the to-be-tested equipment without manual wiring, so that the test time is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical appliance testing, and in particular to a testing tool and a testing system. Background Art

[0002] Armored vehicle air conditioners must first undergo safety tests before leaving the factory to test parameters such as withstand voltage, insulation resistance, grounding resistance, leakage current, etc., and then an operation test is required to confirm that all functions and components of the armored vehicle air conditioner are operating normally.

[0003] However, since the voltages and equipment required for safety testing and operational testing are different, the entire test process is: connect the line between the safety tester and the armored vehicle air conditioner → perform safety testing → remove the line between the safety tester and the armored vehicle air conditioner → connect the line between the air conditioner power supply and the armored vehicle air conditioner → perform operational testing → remove the line between the air conditioner power supply and the armored vehicle air conditioner. It can be seen that the entire test process requires testers to repeatedly perform wiring work, which will consume a lot of testing hours during mass production, thus seriously affecting production efficiency. Summary of the invention

[0004] The present invention provides a test fixture and a test system, wherein the test fixture can automatically implement safety test and operation test of a device to be tested without manual wiring, thereby reducing test time and improving production efficiency.

[0005] According to one aspect of the present invention, there is provided a test fixture, comprising: an input terminal, a first test circuit, a second test circuit, a control circuit and an output terminal;

[0006] The first test circuit and the second test circuit are connected in parallel between the input end and the output end; the input end is connected to an external power supply, and the output end is electrically connected to the device under test;

[0007] The control circuit is used to control the on and off of the first test circuit and the second test circuit;

[0008] Among them, the test fixture only allows one test circuit to be turned on at the same time;

[0009] The first test circuit includes a safety test unit, and the second test circuit includes a power conversion unit; when the first test circuit is turned on, the safety test unit is used to perform a safety test on the device under test; when the second test circuit is turned on, the power conversion unit is used to convert an external power supply into a target power supply that matches the device under test, so that the device under test can perform an operation test.

[0010] Optionally, the control circuit includes: a control unit, a first contactor and a second contactor, the first contactor includes a first coil and a first main contact, and the second contactor includes a second coil and a second main contact; wherein,

[0011] The control unit is connected in series with the first coil and the second coil respectively; the first main contact is arranged in the first test circuit and is connected in series between the safety test unit and the output end; the second main contact is arranged in the second test circuit and is connected in series between the power conversion unit and the output end;

[0012] The control unit is electrically connected to the first test circuit and the second test circuit.

[0013] Optionally, the first contactor further includes a first auxiliary contact, and the second contactor further includes a second auxiliary contact; wherein,

[0014] The first auxiliary contact is connected in series between the control unit and the second coil; the second auxiliary contact is connected in series between the control unit and the first coil.

[0015] Optionally, the first test circuit further includes a first protection unit, and the second test circuit further includes a second protection unit; wherein,

[0016] The first protection unit is connected in series between the safety test unit and the output end; the second protection unit is connected in series between the power conversion unit and the output end.

[0017] Optionally, when the control unit controls the first coil to be energized, the first main contact is closed and the second main contact is disconnected, so that the first test circuit is turned on and the second test circuit is disconnected;

[0018] When the control unit controls the second coil to be energized, the second main contact is closed and the first main contact is disconnected, so that the second test circuit is turned on and the first test circuit is disconnected.

[0019] Optionally, the safety test unit is electrically connected to the control unit, and the safety test unit is further used to send a test completion message to the control unit after the safety test is completed;

[0020] or,

[0021] The control unit is also used to determine whether the safety test and the operation test are completed according to the timer set in the control unit.

[0022] Optionally, the external power supply is an AC power supply or a DC power supply; the target power supply is a DC power supply.

[0023] Optionally, the first contactor and the second contactor are both DC contactors.

[0024] According to another aspect of the present invention, a test system is provided, comprising the test fixture of any of the above embodiments, and a device to be tested; wherein:

[0025] The input end of the test fixture is connected to an external power supply, and the output end of the test fixture is electrically connected to the device under test.

[0026] Optionally, the device to be tested is an armored vehicle air conditioner, and the power required by the armored vehicle air conditioner is a 24V DC power supply.

[0027] The technical solution of the embodiment of the present invention is to design a new type of test fixture, the test fixture includes an input end, a first test circuit, a second test circuit, a control circuit and an output end; the first test circuit and the second test circuit are connected in parallel between the input end and the output end; the input end is connected to an external power supply, and the output end is electrically connected to the device under test; the control circuit is used to control the on and off of the first test circuit and the second test circuit. Since the test fixture only allows one test circuit to be turned on at the same time, the first test circuit includes a safety test unit, and the second test circuit includes a power conversion unit, therefore, when the test is working, either the first test circuit is turned on or the second test circuit is turned on. When the first test circuit is turned on, the safety test unit is used to perform safety testing on the device under test; when the second test circuit is turned on, the power conversion unit is used to convert the external power supply into a target power supply that matches the device under test, so that the device under test can perform an operation test. Compared with the existing solution in which testers repeatedly perform wiring, the test fixture provided by the present invention can automatically realize the safety test and operation test of the device under test without manual wiring, thereby reducing the test time and improving production efficiency.

[0028] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 It is a structural schematic diagram of a test tool provided in Embodiment 1 of the present invention;

[0031] Figure 2 is a structural schematic diagram of another test tool provided in the first embodiment of the present invention;

[0032] Figure 3 It is a structural schematic diagram of another test tool provided in the first embodiment of the present invention;

[0033] Figure 4 It is a structural diagram of a test system provided in Embodiment 2 of the present invention. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. 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 should fall within the scope of protection of the present invention.

[0035] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0036] Embodiment 1

[0037] Figure 1 Schematic diagram of the structure of a test tool provided in the first embodiment of the present invention. Figure 1 As shown, the test fixture includes: an input terminal IN, a first test circuit 100, a second test circuit 200, a control circuit 300 and an output terminal OUT.

[0038] The first test circuit 100 and the second test circuit 200 are connected in parallel between an input terminal IN and an output terminal OUT. The input terminal IN is connected to an external power supply, and the output terminal OUT is electrically connected to the device under test.

[0039] The control circuit 300 is used to control the on and off of the first test circuit 100 and the second test circuit 200 .

[0040] In the present invention, the test fixture only allows one test circuit to be turned on at the same time. That is, the control circuit 300 controls one test circuit to be turned on and one test circuit to be turned off during operation, that is, if the control circuit 300 controls the first test circuit 100 to be turned on during operation, the second test circuit 200 will be turned off; if the control circuit 300 controls the second test circuit 200 to be turned on, the first test circuit 100 will be turned off.

[0041] The first test circuit 100 includes a safety test unit 101, and the second test circuit 200 includes a power conversion unit 201; when the first test circuit 100 is turned on, the safety test unit 101 is used to perform a safety test on the device under test; when the second test circuit 200 is turned on, the power conversion unit 201 is used to convert an external power supply into a target power supply that matches the device under test, so that the device under test can perform an operation test.

[0042] Specifically, the safety test unit 101 has a program setting function, that is, the program required for the safety test is stored in the safety test unit 101. When the first test circuit 100 is turned on, the safety test unit 101 executes the program required for the safety test, thereby realizing the safety test of the device under test. Similarly, the device under test has a program setting function, that is, the program required for the operation test is stored in the device under test. When the second test circuit 200 is turned on, the second test circuit 200 provides the required target power supply for the device under test, so that the device under test executes the program required for the operation test to perform the operation test.

[0043] In one embodiment, the control circuit 300 provided by the present invention can control the on and off of the first test circuit 100 and the second test circuit 200 by directly controlling whether the safety test unit 101 and the power conversion unit 201 are working; the control circuit 300 can also control the on and off of the first test circuit 100 and the second test circuit 200 through a circuit structure, and the embodiment of the present invention does not impose specific restrictions on this.

[0044] When the control circuit 300 controls the on / off of the first test circuit 100 and the second test circuit 200 through the circuit structure, Figure 1 On the basis of Figure 2 Schematic diagram of another test tool provided in the first embodiment of the present invention. Figure 2 As shown, the control circuit 300 includes: a control unit 301, a first contactor KM1 and a second contactor KM2, the first contactor KM1 includes a first coil KM1a and a first main contact KM1b, and the second contactor KM2 includes a second coil KM2a and a second main contact KM2b.

[0045] The control unit 301 is connected in series with the first coil KM1a and the second coil KM2a respectively; the first main contact KM1b is arranged in the first test circuit 100 and is connected in series between the safety test unit 101 and the output terminal OUT; the second main contact KM2b is arranged in the second test circuit 200 and is connected in series between the power conversion unit 201 and the output terminal OUT. The control unit 301 is electrically connected with the first test circuit 100 and the second test circuit 200.

[0046] In one embodiment, continue to refer to Figure 2The first contactor KM1 further includes a first auxiliary contact KM1c, and the second contactor KM2 further includes a second auxiliary contact KM2c. The first auxiliary contact KM1c is connected in series between the control unit 301 and the second coil KM2a; the second auxiliary contact KM2c is connected in series between the control unit 301 and the first coil KM1a.

[0047] In one embodiment, in order to improve the safety of the test tool, Figure 2 On the basis of Figure 3 Schematic diagram of another test tool provided in the first embodiment of the present invention. Figure 3 As shown, the first test circuit 100 further includes a first protection unit FU1, and the second test circuit 200 further includes a second protection unit FU2. The first protection unit FU1 is connected in series between the safety test unit and the output end; the second protection unit is connected in series between the power conversion unit and the output end.

[0048] Specifically, the first protection unit FU1 and the second protection unit FU2 may be devices with circuit protection functions such as insurance and fuses.

[0049] Combination Figure 2 or Figure 3 The test fixture shown in the figure usually performs safety test first and then operation test. The control logic of the control unit 301 is as follows: when the test starts, the control unit 301 first controls the first coil KM1a to be energized, at which time the first main contact KM1b is energized, the first auxiliary contact KM1c is disconnected, and the second coil KM2a is not energized, resulting in the second main contact KM2b being disconnected, so the first test circuit 100 is turned on and the second test circuit 200 is disconnected, and the safety test unit 101 performs safety test on the device under test; after the safety test is completed, the control unit 301 controls the second coil KM2a to be energized, at which time the second main contact KM2b is energized, the second auxiliary contact KM2c is disconnected, and the first coil KM1a becomes not energized, resulting in the first main contact KM1b being disconnected, so the second test circuit 200 is turned on and the first test circuit 100 is disconnected, and the power conversion unit 201 converts the external power supply into a target power supply matching the device under test, so that the device under test performs operation test.

[0050] Regarding how to determine whether the safety test and the operation test are completed, the test tool provided by the present invention provides the following two possible implementation methods.

[0051] The first possible implementation method is to electrically connect the safety test unit 101 to the control unit 301 and the device under test control unit 301, and the safety test unit 101 and the device under test have a message sending function. After the safety test is completed, the safety test unit 101 can send a test completion message to the control unit 301; after the operation test is completed, the device under test can send a test completion message to the control unit 301.

[0052] The second possible implementation method: set a timer in the control unit 301, and set test times T1 and T2 for the safety test and the operation test respectively. When the control unit 301 controls the first coil KM1a to be energized, the timer starts. When the timer reaches the test time T1, the control unit 301 considers that the safety test is completed. At this time, the control unit 301 controls the second coil KM2a to be energized, the timer is reset and restarted, and when the timer reaches the test time T2, the control unit 301 considers that the operation test is completed. In an alternative solution, the number of timers can be 2, and the two timers correspond to the test time T1 of the safety test and the test time T2 of the operation test respectively. The rest of the control methods are the same and will not be repeated here.

[0053] In one embodiment, the lengths of the test times T1 and T2 may be set according to specific test items, and the embodiment of the present invention does not impose any specific limitation on this.

[0054] In one embodiment, the external power source is an AC power source or a DC power source; and the target power source is a DC power source.

[0055] In one embodiment, a display device with a touch function or a start button may also be provided in the control unit 301, and the tester may start the entire test process by touching the display device or pressing the start button.

[0056] When the external power supply is an AC power supply, the input terminal IN may include a neutral line, a live line, and a ground line; when the external power supply is a DC power supply, the input terminal IN may include a positive input terminal and a negative input terminal. Since the target power supply is a DC power supply, the output terminal OUT includes a positive output terminal and a negative output terminal.

[0057] In one embodiment, the first contactor KM1 and the second contactor KM2 are both DC contactors. A DC contactor is a contactor whose iron core is controlled by a DC coil, and its load can be either DC or AC. Since the attraction coil of the DC contactor is connected with DC, there is no impact starting current, and there will be no violent impact of the iron core. Compared with AC contactors, DC contactors have a longer life and are suitable for occasions where frequent starting and stopping occurs.

[0058] The embodiment of the present invention provides a test fixture, including an input end, a first test circuit, a second test circuit, a control circuit and an output end; the first test circuit and the second test circuit are connected in parallel between the input end and the output end; the input end is connected to an external power supply, and the output end is electrically connected to a device under test; the control circuit is used to control the on and off of the first test circuit and the second test circuit. Since the test fixture only allows one test circuit to be turned on at the same time, the first test circuit includes a safety test unit, and the second test circuit includes a power conversion unit, therefore, when the test is working, either the first test circuit is turned on or the second test circuit is turned on. When the first test circuit is turned on, the safety test unit is used to perform a safety test on the device under test; when the second test circuit is turned on, the power conversion unit is used to convert the external power supply into a target power supply that matches the device under test, so that the device under test can perform an operation test. Compared with the existing solution in which testers repeatedly perform wiring, the test fixture provided by the present invention can automatically realize the safety test and operation test of the device under test without manual wiring, thereby reducing the test time and improving production efficiency.

[0059] Embodiment 2

[0060] Figure 4 Schematic diagram of the structure of a test system provided by Embodiment 2 of the present invention. Figure 4 As shown, the test system includes: the test fixture 1 in the above-mentioned embodiment 1, and the device to be tested 2.

[0061] An input terminal IN of the test fixture 1 is connected to an external power supply, and an output terminal OUT of the test fixture 1 is electrically connected to the device under test 2 .

[0062] In one embodiment, the external power source is usually the mains, ie, industrial frequency alternating current (AC), characterized by three common quantities of AC: voltage, current, and frequency. The device under test 2 is usually an electrical device that requires a DC power source.

[0063] In one embodiment, the device to be tested 2 is an armored vehicle air conditioner, and the power required by the armored vehicle air conditioner is a 24V DC power supply.

[0064] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A test tool, characterized in that: include: An input terminal, a first test circuit, a second test circuit, a control circuit and an output terminal; The first test circuit and the second test circuit are connected in parallel between the input end and the output end; the input end is connected to an external power supply, and the output end is electrically connected to the device under test; The control circuit is used to control the on and off of the first test circuit and the second test circuit; Wherein, the test fixture only allows one test circuit to be turned on at the same time; The first test circuit includes a safety test unit, and the second test circuit includes a power conversion unit; when the first test circuit is turned on, the safety test unit is used to perform a safety test on the device under test; when the second test circuit is turned on, the power conversion unit is used to convert the external power supply into a target power supply that matches the device under test, so that the device under test can perform an operation test.

2. The test tool according to claim 1, characterized in that: The control circuit comprises: a control unit, a first contactor and a second contactor, wherein the first contactor comprises a first coil and a first main contact, and the second contactor comprises a second coil and a second main contact; wherein, The control unit is connected in series with the first coil and the second coil respectively; the first main contact is arranged in the first test circuit and is connected in series between the safety test unit and the output end; the second main contact is arranged in the second test circuit and is connected in series between the power conversion unit and the output end; The control unit is electrically connected to the first test circuit and the second test circuit.

3. The test tool according to claim 2, characterized in that: The first contactor further includes a first auxiliary contact, and the second contactor further includes a second auxiliary contact; wherein, The first auxiliary contact is connected in series between the control unit and the second coil; the second auxiliary contact is connected in series between the control unit and the first coil.

4. The test tool according to claim 2, characterized in that: The first test circuit further includes a first protection unit, and the second test circuit further includes a second protection unit; wherein, The first protection unit is connected in series between the safety test unit and the output end; the second protection unit is connected in series between the power conversion unit and the output end.

5. The test tool according to any one of claims 2 to 4, characterized in that: When the control unit controls the first coil to be energized, the first main contact is closed and the second main contact is disconnected, so that the first test circuit is turned on and the second test circuit is disconnected; When the control unit controls the second coil to be energized, the second main contact is closed and the first main contact is disconnected, so that the second test circuit is turned on and the first test circuit is disconnected.

6. The test tool according to claim 2, characterized in that: The safety test unit is electrically connected to the control unit, and the safety test unit is further used to send a test completion message to the control unit after the safety test is completed; or, The control unit is also used to determine whether the safety test and the operation test are completed according to a timer set in the control unit.

7. The test tool according to claim 1, characterized in that: The external power source is an AC power source or a DC power source; the target power source is a DC power source.

8. The test fixture according to claim 2, characterized in that: The first contactor and the second contactor are both DC contactors.

9. A testing system, characterized in that: Comprising the test fixture as described in any one of claims 1 to 8, and a device to be tested; wherein, The input end of the test fixture is connected to an external power supply, and the output end of the test fixture is electrically connected to the device under test.

10. The test system according to claim 9, characterized in that: The device to be tested is an armored vehicle air conditioner, and the power required by the armored vehicle air conditioner is a 24V DC power supply.

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