Power switching circuit and power switching device
By designing a power switching circuit, the positive and negative electrode reverse output of the power supply power is achieved by using the switching switch, which solves the problem that reverse voltage testing requires manual pole switching wiring harness in the prior art, and realizes efficient and safe reverse voltage testing .
Patent Information
- Application Number
- CN202420466574.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-11
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-03-11
AI Technical Summary
When conducting reverse voltage testing in the prior art, it is necessary to manually replace the positive and negative electrode wiring harness of the VT power supply, resulting in wasted testing time, safety risks and low testing accuracy.
Design a power switching circuit, including a first positive power port, a second positive power port, a third positive power port, a first negative power port, a second negative power port, a third negative power port, a first switching switch and a The two switching switch, by switching the switch, the positive and negative electrodes of the power supply power supply are output inversely to the product to be tested, realizing the output of the reverse voltage.
The output of the reverse voltage is achieved, reducing equipment costs, improving the accuracy of the test process, reducing working hours, and reducing safety risks.
Smart Images
Figure CN222441360U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of power supplies, in particular to a power switching circuit and a power switching device. Background Art
[0002] With the widespread application of VT power supplies, users have higher and higher requirements for VT power supplies. In the process of using VT power supplies to test products, in some cases, the VT power supply needs to output reverse voltage to the product to be tested to perform reverse voltage testing. However, the VT power supply itself does not have the ability to output reverse voltage. In practical applications, reverse voltage testing is essential. Since devices with reverse voltage output capabilities are generally more expensive and less frequently used, it is extremely uneconomical from a cost perspective to purchase specific reverse voltage output devices for some experiments.
[0003] Therefore, in the prior art, when conducting a reverse voltage test, the operator usually manually swaps the positive and negative wiring harnesses of the VT power supply to perform this test. However, this test method has no advantages from the perspective of working hours, test accuracy, or safety. Manually disconnecting the positive and negative power supplies during the test requires powering on and off the product to be tested, wasting a lot of unnecessary time; if the operator touches the bare copper of the wiring harness during the operation, it is very likely to cause damage to him, posing a safety hazard. Utility Model Content
[0004] The utility model aims to provide a power switching circuit and a power switching device. When a first switching switch is connected to its own fixed end and the first switching end, and a second switching switch is connected to its own fixed end and the first switching end, the positive pole of the power supply can be connected to the third negative power supply port through the second positive power supply port, and the negative pole of the power supply can be connected to the third positive power supply port through the second negative power supply port, so that the power supply can be reversely output to the product to be tested, thereby realizing the output of reverse voltage, greatly reducing equipment cost, improving the accuracy of the test process, and eliminating the need for personnel to manually operate the power supply during the test process, thereby reducing working hours and reducing safety risks.
[0005] In order to solve the above technical problems, the utility model provides a power switching circuit, including a first positive power port, a second positive power port, a third positive power port, a first negative power port, a second negative power port, a third negative power port, a first switching switch and a second switching switch, wherein the first positive power port is connected to the positive pole of the power supply, the first negative power port is connected to the negative pole of the power supply, the third positive power port is connected to the positive pole of the product to be tested, and the third negative power port is connected to the negative pole of the product to be tested; a fixed end of the first switching switch is connected to the first positive power port, a first switching end is connected to the second positive power port, a second switching end is connected to the third positive power port, a fixed end of the second switching switch is connected to the first negative power port, a first switching end is connected to the second negative power port, a second switching end is connected to the third negative power port, the second positive power port is connected to the third negative power port, and the second negative power port is connected to the third positive power port;
[0006] The first switching switch is used to connect its own fixed end and the second switching end when the product under test needs a positive power supply, and to connect its own fixed end and the first switching end when the product under test needs a negative power supply;
[0007] The second switching switch is used to connect its own fixed end and the second switching end when the product under test needs a positive power supply, and to connect its own fixed end and the first switching end when the product under test needs a negative power supply.
[0008] Optionally, it also includes a first overcurrent protection module and a second overcurrent protection module, wherein the first end of the first overcurrent protection module is connected to the positive pole of the product to be tested, and the second end is connected to the third positive power supply port, and the first end of the second overcurrent protection module is connected to the negative pole of the product to be tested, and the second end is connected to the third negative power supply port.
[0009] Optionally, the first overcurrent protection module and the second overcurrent protection module are both fuses.
[0010] Optionally, it further includes a first prompt module and a second prompt module, wherein the first end of the first prompt module is connected to the second positive power port, and the second end is connected to the third negative power port, and the first end of the second prompt module is connected to the second negative power port, and the second end is connected to the third positive power port;
[0011] The first prompt module is used to execute a corresponding prompt strategy when the power output to the product to be tested is a reverse power supply;
[0012] The second prompt module is used to execute a corresponding prompt strategy when the power output to the product to be tested is a forward power supply.
[0013] Optionally, it further includes a communication module and a host computer, wherein the host computer is connected to the product to be tested via the communication module;
[0014] The host computer is used to receive the test result of the product to be tested through the communication module.
[0015] Optionally, it also includes a third switching switch, a first switching module and a second switching module, the third switching switch includes a first switching sub-switch and a second switching sub-switch, the fixed end of the first switching module is connected to the positive electrode of the power supply, the first switching end is connected to the first positive power port, the second switching end is connected to the fixed end of the second switching sub-switch, the fixed end of the second switching module is connected to the negative electrode of the power supply, the first switching end is connected to the first negative power port, the second switching end is connected to the fixed end of the first switching sub-switch, the first switching end of the first switching sub-switch is connected to the negative electrode of the product to be tested, the second switching end is connected to the positive electrode of the product to be tested, the first switching end of the second switching sub-switch is connected to the positive electrode of the product to be tested, and the second switching end is connected to the negative electrode of the product to be tested;
[0016] The first switching sub-switch is used to connect its own fixed end and the first switching end when the product under test needs a positive power supply, and to connect its own fixed end and the second switching end when the product under test needs a negative power supply;
[0017] The second switching sub-switch is used to connect its own fixed end and the first switching end when the product under test needs a positive power supply, and to connect its own fixed end and the second switching end when the product under test needs a negative power supply.
[0018] Optionally, the third switching switch is an intermediate relay, the intermediate relay includes a first contact and a second contact, the first switching sub-switch is the first contact, and the second switching sub-switch is the second contact.
[0019] Optionally, it further comprises a measuring module, wherein a first input terminal of the measuring module is connected to the positive electrode of the product to be tested, and a second input terminal of the measuring module is connected to the negative electrode of the product to be tested;
[0020] The measuring module is used to measure the magnitude of the output voltage output to the product to be tested.
[0021] In order to solve the above technical problems, the utility model also provides a power switching device, including a VT board, a power supply and the power switching circuit as described above.
[0022] Optionally, the first positive power port, the second positive power port, the third positive power port, the first negative power port, the second negative power port and the third negative power port are all arranged on the VT board.
[0023] The utility model provides a power switching circuit, including a first positive power port, a second positive power port, a third positive power port, a first negative power port, a second negative power port, a third negative power port, a first switching switch and a second switching switch. The first switching switch can switch the connected positive power port, and the second switching switch can switch the connected negative power port. When the third positive power port is connected to the positive pole of a product to be tested and the third negative power port is connected to the negative pole of the product to be tested, the second positive power port is connected to the third negative power port and the second negative power port is connected to the third positive power port. Therefore, when the first switching switch connects its own fixed end and the first switching end and the second switching switch connects its own fixed end and the first switching end, the positive pole of the power supply can be connected to the third negative power port through the second positive power port, and the negative pole of the power supply can be connected to the third positive power port through the second negative power port, so that the power supply is reversely output to the product to be tested, and the output of reverse voltage is realized, which greatly reduces the equipment cost and improves the accuracy of the test process. During the test process, there is no need for personnel to manually operate the power supply, which reduces working hours and reduces safety risks.
[0024] The utility model also provides a power switching device, which has the same beneficial effects as the above power switching circuit. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the prior art and the drawings required for use in the embodiments are briefly introduced below. 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.
[0026] Figure 1 A schematic diagram of the structure of a power switching circuit provided by the utility model;
[0027] Figure 2 This is a structural schematic diagram of a power switching device provided by the utility model. DETAILED DESCRIPTION
[0028] The core of the utility model is to provide a power switching circuit and a power switching device. When the first switching switch is connected to its own fixed end and the first switching end, and the second switching switch is connected to its own fixed end and the first switching end, the positive pole of the power supply can be connected to the third negative power supply port through the second positive power supply port, and the negative pole of the power supply can be connected to the third positive power supply port through the second negative power supply port, so that the power supply can be reversely output to the product to be tested, realizing the output of reverse voltage, greatly reducing equipment costs, and improving the accuracy of the test process. During the test process, there is no need for personnel to manually operate the power supply, which reduces working hours and reduces safety risks.
[0029] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0030] Please refer to Figure 1 , Figure 1 This is a schematic diagram of a power switching circuit provided by the utility model; please refer to Figure 2 , Figure 2 This is a structural schematic diagram of a power switching device provided by the utility model. In order to solve the above technical problems, the utility model provides a power switching circuit, including a first positive power port A1, a second positive power port A2, a third positive power port A3, a first negative power port B1, a second negative power port B2, a third negative power port B3, a first switching switch Q1 and a second switching switch Q2, the first positive power port A1 is connected to the positive electrode of the power supply 1, the first negative power port B1 is connected to the negative electrode of the power supply 1, the third positive power port A3 is connected to the positive electrode of the product to be tested 2, and the third negative power port B3 is connected to the negative electrode of the product to be tested 2; the fixed end of the first switching switch Q1 is connected to the first positive power port A1, the first switching end is connected to the second positive power port A2, the second switching end is connected to the third positive power port A3, the fixed end of the second switching switch Q2 is connected to the first negative power port B1, the first switching end is connected to the second negative power port B2, the second switching end is connected to the third negative power port B3, the second positive power port A2 is connected to the third negative power port B3, and the second negative power port B2 is connected to the third positive power port A3;
[0031] The first switching switch Q1 is used to connect its own fixed end and the second switching end when the product under test 2 needs a positive power supply, and to connect its own fixed end and the first switching end when the product under test 2 needs a negative power supply;
[0032] The second switch Q2 is used to connect its own fixed end and the second switch end when the product under test 2 needs a positive power supply, and to connect its own fixed end and the first switch end when the product under test 2 needs a negative power supply.
[0033] Specifically, when the product 2 to be tested requires a forward power supply, the first switching switch Q1 connects its own fixed end and the second switching end, and the second switching switch Q2 connects its own fixed end and the second switching end. At this time, the positive electrode of the power supply 1 is connected to the positive electrode of the product 2 to be tested through the first positive power supply end and the third positive power supply port A3 in sequence, and the negative electrode of the power supply 1 is connected to the negative electrode of the product 2 to be tested through the first negative power supply port B1 and the third negative power supply port B3 in sequence, so that the power supply 1 supplies forward power to the product 2 to be tested; when the product 2 to be tested requires a reverse power supply, the first switching switch Q1 connects its own fixed end and the first switching end, and the second switching switch Q2 connects its own fixed end and the first switching end. At this time, the positive electrode of the power supply 1 is connected to the negative electrode of the product 2 to be tested through the first positive power supply port A1, the second positive power supply port A2 and the third negative power supply port B3 in sequence, and the negative electrode of the power supply 1 is connected to the positive electrode of the product 2 to be tested through the first negative power supply port B1, the second negative power supply port B2 and the third positive power supply port A3 in sequence, so that the power supply 1 supplies reverse power to the product 2 to be tested.
[0034] It should be noted that the VT power supply usually needs to be implemented using a VT system that integrates multiple board circuits. When the power switching circuit needs to be applied to the VT power supply, it is only necessary to directly integrate this power switching circuit into the VT system or connect it to the VT system; in order to further save volume and occupy space, the first positive power port A1, the second positive power port A2, the third positive power port A3, the first negative power port B1, the second negative power port B2 and the third negative power port B3 can be further set on the VT board, and the first switching switch Q1 and the second switching switch Q2 can also be adaptively arranged inside the VT board. The VT system includes a VT board and board circuits that realize other functions, etc. The power supply 1 can also be implemented by a DC power supply integrated in the VT system, or the VT7001 board in the VT system can be directly used to provide DC current, thereby further simplifying the entire circuit structure.
[0035] It is not difficult to understand that, through the switching process of the first switching switch Q1 and the second switching switch Q2, the process of reverse output of the positive and negative poles of the VT power supply to the product under test 2 can be effectively realized, thereby testing the ability of the product under test 2 to withstand reverse voltage, thereby realizing the function of outputting negative voltage without the need for a power supply with negative voltage output capability, greatly reducing the cost of equipment use and greatly improving work efficiency in executing tests.
[0036] It should be noted that the present application does not make any special restrictions on the specific types and implementation methods of the first positive power port A1, the second positive power port A2, the third positive power port A3, the first negative power port B1, the second negative power port B2, the third negative power port B3, the first switching switch Q1 and the second switching switch Q2. The setting position, shape and size of each power port can be selected and adjusted according to actual application requirements; the first switching switch Q1 and the second switching switch Q2 can be implemented by switchable switching devices such as single-pole double-throw switches, conversion contacts and conversion switches. The setting position can be inside the VT board or outside the VT board as an independent circuit; the first switching switch Q1 and the second switching switch Q2 can be implemented by the same type of switching device or by different types of switching devices, and can be flexibly set according to actual conditions.
[0037] As a specific embodiment, Figure 2 As shown, each power port, the first switch Q1 and the second switch Q2 are all set inside the VT board, and the default state of the first switch Q1 corresponding to the default gear is set to A1 normally closed A3, that is, the A1 port is connected to the A3 port by default, and the default state of the first switch Q1 is B1 normally closed B3, that is, the B1 port is connected to the B3 port by default. At the same time, the A2 port and the B3 port are short-circuited and connected to the positive pole of the product 2 to be tested, and the A3 port and the B2 port are short-circuited and connected to the negative pole of the product 2 to be tested. When the VT board is placed in the default gear, the positive and negative poles of the VT power supply are normally connected to the positive and negative poles of the product 2 to be tested, so that the product 2 to be tested works normally. When the first switch Q1 and the second switch Q2 are switched to gear 2 at the same time, the A1 port and the A2 port are connected, and the B1 port and the B2 port are connected, and the positive and negative poles of the product 2 to be tested are reversed without operating the power supply, thereby performing a reverse voltage test.
[0038] It is not difficult to understand that the operation of switching the reverse voltage only needs to control the switching of the first switching switch Q1 and the second switching switch Q2 to automatically perform the reverse voltage test. Based on the power switching circuit provided by this application, in the process of reverse output of positive and negative poles in conjunction with the VT system, the operator does not need to manually switch the positive and negative poles, which can reduce at least 80% of the working hours; secondly, because there is no need to manually switch the wiring harness, the safety risk is also reduced from extremely high to zero, and the operator will not touch the bare copper and cause electric shock; finally, a fully automated testing process is realized, the performance of the product is also as expected, and the accuracy of the entire testing process is greatly improved.
[0039] The utility model provides a power switching circuit, including a first positive power port A1, a second positive power port A2, a third positive power port A3, a first negative power port B1, a second negative power port B2, a third negative power port B3, a first switching switch Q1 and a second switching switch Q2, wherein the first switching switch Q1 can switch the connected positive power port, and the second switching switch Q2 can switch the connected negative power port, and when the third positive power port A3 is connected to the positive electrode of the product to be tested 2 and the third negative power port B3 is connected to the negative electrode of the product to be tested 2, the second positive power port A2 is connected to the third negative power port B3 and the second negative power port B3 is connected to the negative electrode of the product to be tested 2. Port B2 is connected to the third positive power port A3, so when the first switching switch Q1 is connected to its own fixed end and the first switching end, and the second switching switch Q2 is connected to its own fixed end and the first switching end, the positive pole of the power supply 1 can be connected to the third negative power port B3 through the second positive power port A2, and the negative pole of the power supply 1 can be connected to the third positive power port A3 through the second negative power port B2, so that the power supply 1 is reversely output to the product under test 2, realizing the output of reverse voltage, greatly reducing equipment costs, and improving the accuracy of the test process. During the test process, there is no need for personnel to manually operate the power supply, reducing working hours and reducing safety risks.
[0040] Based on the above embodiments:
[0041] As an optional embodiment, it also includes a first overcurrent protection module and a second overcurrent protection module, the first end of the first overcurrent protection module is connected to the positive pole of the product to be tested 2, and the second end is connected to the third positive power supply port A3, the first end of the second overcurrent protection module is connected to the negative pole of the product to be tested 2, and the second end is connected to the third negative power supply port B3.
[0042] Taking into account that when the current output to the product under test 2 is too large, it may cause damage to the positive and negative poles of the product under test 2 or even the entire product under test 2, a first overcurrent protection module connected to the front end of the positive pole of the product under test 2 and a second overcurrent protection module connected to the front end of the negative pole of the product under test 2 can be further increased. The overcurrent protection module can automatically disconnect the connection line when the current output to the product under test 2 is too large, so as to avoid the occurrence of situations such as large current burning the product under test 2 or short circuit; the specific types and implementation methods of the first overcurrent protection module and the second overcurrent protection module are not particularly limited in this application.
[0043] Specifically, by adding a first overcurrent protection module and a second overcurrent protection module, it is possible to effectively avoid large currents being directly output to the product under test 2, thereby preventing damage to the product under test 2 or even a short circuit in the entire circuit, thereby further improving the safety and reliability of the product under test 2 and the entire power switching circuit.
[0044] As an optional embodiment, the first overcurrent protection module and the second overcurrent protection module are both fuses.
[0045] It is not difficult to understand that the first overcurrent protection module and the second overcurrent protection module can both be implemented by fuses. In addition, they can also be implemented by overcurrent protection devices such as current relays. The first overcurrent protection module and the second overcurrent protection module can use the same type of overcurrent protection device, or they can be implemented by two types of overcurrent protection devices respectively. The specific type and implementation method of the fuse are not particularly limited in this application.
[0046] Specifically, the fuse can effectively realize the functions of the first overcurrent protection module and the second overcurrent protection module, and the fuse itself is small in size, low in cost, and easy to replace. When set in the power switching circuit, the circuit structure is simple and easy to implement, which is conducive to the simple implementation of the entire power switching circuit.
[0047] As an optional embodiment, it also includes a first prompt module and a second prompt module, the first end of the first prompt module is connected to the second positive power port A2, and the second end is connected to the third negative power port B3, the first end of the second prompt module is connected to the second negative power port B2, and the second end is connected to the third positive power port A3;
[0048] The first prompt module is used to execute a corresponding prompt strategy when the power output to the product under test 2 is a reverse power supply;
[0049] The second prompt module is used to execute a corresponding prompt strategy when the power output to the product under test 2 is a forward power supply.
[0050] It is not difficult to understand that in order to facilitate the operator to determine the voltage currently received by the product under test 2, a first prompt module and a second prompt module can be further set up. When the product under test 2 receives a forward power supply, the second prompt module is energized accordingly, thereby executing a corresponding prompt strategy to prompt the operator that the product under test 2 receives a forward power supply at this time; when the product under test 2 receives a reverse power supply, the first prompt module is energized accordingly, thereby executing a corresponding prompt strategy to prompt the operator that the product under test 2 receives a reverse power supply at this time; the specific types, settings, and implementation methods of the first prompt module and the second prompt module are not particularly limited in this application. The two can use the same type of prompt module or different types of prompt modules; the first prompt module and the second prompt module can be implemented using devices with prompt or alarm functions such as prompt lights and sound and light alarm modules. The specific prompt strategy also needs to be set according to the specific types used by the first prompt module and the second prompt module, and the present application does not make any special restrictions here.
[0051] Specifically, a first prompt module and a second prompt module can be added to prompt the operator of the specific situation of the power currently received by the product under test 2, so as to avoid situations where the operator is replaced or the operator temporarily leaves and the operator has difficulty in clarifying the specific situation of the power currently received by the product under test 2. The working status of the power switching circuit can be intuitively displayed, which is conducive to the accurate implementation of the entire test process.
[0052] As an optional embodiment, it further includes a communication module 12 and a host computer 11, and the host computer 11 is connected to the product to be tested 2 through the communication module 12;
[0053] The host computer 11 is used to receive the test result of the product to be tested 2 through the communication module 12 .
[0054] It is not difficult to understand that in order to facilitate the reception and processing of test results, a host computer 11 connected to the product to be tested 2 through a communication module 12 can be further added. The communication module 12 establishes a communication connection between the product to be tested 2 and the host computer 11. The host computer 11 can also be further connected to the VT system to perform operations such as configuration of the VT system. The specific types and implementation methods of the host computer 11 and the communication module 12 are not particularly limited in this application. The host computer 11 can be implemented by a computer or the like, and the communication module 12 can be implemented by boards such as VN1640A, or by other types of communication equipment. The connection method between the host computer and the communication module is not particularly limited in this application, and it can be implemented by USB connection. The connection method between the communication module and the product to be tested is not particularly limited in this application, and it can be implemented by twisted pair connection.
[0055] Specifically, a host computer 11 and a communication module 12 may be further provided to process the test results of the product 2 to be tested, and the entire test process may be monitored to facilitate accurate testing and improve the reliability of the entire test process.
[0056] As an optional embodiment, it also includes a third switching switch, a first switching module K1 and a second switching module K2, the third switching switch includes a first switching sub-switch and a second switching sub-switch, the fixed end of the first switching module K1 is connected to the positive pole of the power supply 1, the first switching end is connected to the first positive power port A1, the second switching end is connected to the fixed end of the second switching sub-switch, the fixed end of the second switching module K2 is connected to the negative pole of the power supply 1, the first switching end is connected to the first negative power port B1, the second switching end is connected to the fixed end of the first switching sub-switch, the first switching end of the first switching sub-switch is connected to the negative pole of the product to be tested 2, the second switching end is connected to the positive pole of the product to be tested 2, the first switching end of the second switching sub-switch is connected to the positive pole of the product to be tested 2, and the second switching end is connected to the negative pole of the product to be tested 2;
[0057] The first switching sub-switch is used to connect its own fixed end and the first switching end when the product under test 2 needs a positive power supply, and to connect its own fixed end and the second switching end when the product under test 2 needs a negative power supply;
[0058] The second switching sub-switch is used to connect its own fixed end and the first switching end when the product under test 2 needs a positive power supply, and to connect its own fixed end and the second switching end when the product under test 2 needs a negative power supply.
[0059] It is not difficult to understand that a third switching switch can be further added as a second power switching solution, in which a first switching sub-switch and a second switching sub-switch are provided to respectively switch the positive and negative poles of the power supply 1; when the product 2 to be tested requires a positive power supply, the first switching sub-switch connects its own fixed end and the first switching end, and the second switching sub-switch connects its own fixed end and the first switching end. At this time, the positive pole of the power supply 1 is connected to the positive pole of the product 2 to be tested through the fixed end of the second switching sub-switch and the first switching end of the second switching sub-switch in turn, and the negative pole of the power supply 1 is connected to the positive pole of the product 2 to be tested through the fixed end of the first switching sub-switch and the first switching end in turn. The first switching end of the sub-switch is connected to the negative pole of the product to be tested 2, so that the power supply 1 supplies forward power to the product to be tested 2; when the product to be tested 2 needs reverse power, the first switching sub-switch connects its own fixed end and the second switching end, and the second switching sub-switch connects its own fixed end and the second switching end. At this time, the positive pole of the power supply 1 is connected to the negative pole of the product to be tested 2 through the fixed end of the second switching sub-switch and the second switching end of the second switching sub-switch in sequence, and the negative pole of the power supply 1 is connected to the positive pole of the product to be tested 2 through the fixed end of the first switching sub-switch and the second switching end of the first switching sub-switch in sequence, so that the power supply 1 supplies reverse power to the product to be tested 2.
[0060] Furthermore, in order to facilitate the implementation of the first switching scheme coordinated by the first switching switch Q1 and the second switching switch Q2 and the second switching scheme of the third switching switch, it is necessary to further add a first switching module K1 and a second switching module K2. When the first switching scheme is adopted, the first switching module K1 connects the positive pole of the power supply 1 to the first positive power port A1 so that the first switching switch Q1 can be switched, and the second switching module K2 connects the negative pole of the power supply 1 to the first negative power port B1 so that the second switching switch Q2 can be switched; when the second switching scheme is adopted, the first switching module K1 connects the positive pole of the power supply 1 to the fixed end of the first switching sub-switch so that the first switching sub-switch in the third switching switch can be switched, and the second switching module K2 connects the negative pole of the power supply 1 to the fixed end of the second switching sub-switch so that the second switching sub-switch in the third switching switch can be switched.
[0061] It should be noted that the present application does not make any special restrictions on the specific types and implementation methods of the third switching switch, the first switching module K1 and the second switching module K2. The third switching switch can be implemented by an intermediate relay or a conversion switch with two contacts, and the first switching module K1 and the second switching module K2 can be implemented by switchable switching devices such as single-pole double-throw switches, conversion contacts and conversion switches; the specific switching methods of the two power switching schemes can also be selected according to actual application requirements, and the present application does not make any special restrictions here.
[0062] Specifically, the operation of switching the reverse voltage only needs to control the third switching switch to switch, and the reverse voltage test can be automatically performed, which further provides another power switching solution, improves the flexibility of the entire power switching circuit, and expands the application scope of the power switching circuit.
[0063] As an optional embodiment, the third switching switch is an intermediate relay, the intermediate relay includes a first contact Q3 and a second contact Q4, the first switching sub-switch is the first contact Q3, and the second switching sub-switch is the second contact Q4.
[0064] It is not difficult to understand that if Figure 2 As shown, the intermediate relay includes a first contact Q3 and a second contact Q4, and the first contact Q3 and the second contact Q4 can be implemented by normally closed contacts, the fixed end and the first switching end of the first switching sub-switch serve as the two ends of the normally closed contact, and the second switching end is normally open, the fixed end and the first switching end of the second switching sub-switch serve as the two ends of the normally closed contact, and the second switching end is normally open, pin1 of the first contact Q3 is the first switching end of the first switching sub-switch, pin5 is the fixed end of the first switching sub-switch, pin3 is the second switching end of the first switching sub-switch, pin2 of the second contact Q4 is the first switching end of the second switching sub-switch, pin6 is the fixed end of the second switching sub-switch, and pin4 is the second switching end of the second switching sub-switch; pin2 and pin3 can be further short-circuited and connected to the positive pole of the product 2 to be tested, and pin1 and pin4 can be short-circuited and connected to the negative pole of the product 2 to be tested.
[0065] When the intermediate relay is not powered, that is, coil T is de-energized, the positive and negative electrodes of the VT power supply are normally connected to the positive and negative electrodes of the product 2 to be tested, so that the product 2 to be tested can work normally. When the intermediate relay is powered, that is, coil T is energized, pin5 is connected to pin3, pin6 is connected to pin4, and the output direction is reversed without manually replacing the power harness, thereby achieving reverse connection of the positive and negative electrodes of the product 2 to be tested, so as to perform reverse voltage testing.
[0066] Specifically, the third switching switch can be implemented using an intermediate relay with two contacts, which can effectively realize the working process of the third switching switch. The intermediate relay has high reliability, low power consumption, convenient installation and wiring processes, simple circuit structure, and is easy to implement, which is conducive to the simple implementation of the entire power switching circuit.
[0067] As an optional embodiment, it further includes a measuring module 13, wherein a first input terminal of the measuring module 13 is connected to the positive electrode of the product to be tested 2, and a second input terminal of the measuring module 13 is connected to the negative electrode of the product to be tested 2;
[0068] The measuring module 13 is used to measure the magnitude of the output voltage output to the product 2 to be tested.
[0069] It is not difficult to understand that during the test, the measurement module 13 can be further used to monitor whether the voltage value input to the product end is the expected negative value, and the parameters that need to be paid attention to can be monitored in the test according to the test specification. The specific type and implementation method of the measurement module 13 are not particularly limited in this application; the measurement module 13 can also be set in the VT system and implemented by the VT2816 board. The VT2816 board can not only be used as a measurement board, but also as a power supply module for the intermediate relay, connected to the two ends of the coil T of the intermediate relay, and the output ports 2a and 2b of the VT2816 board are used to power the intermediate relay.
[0070] Specifically, a measurement module 13 may be further provided to accurately measure the power supply voltage received by the product 2 to be tested, so as to determine in real time whether the test process is carried out normally, thereby improving the accuracy and reliability of the entire test process.
[0071] In order to solve the above technical problems, the utility model further provides a power switching device, including a VT board, a power supply 1 and the power switching circuit as mentioned above.
[0072] It is not difficult to understand that the power switching circuit can be applied to the VT power supply, and the process of applying it to the VT power supply is realized by connecting the power switching circuit to the VT board card; a start switch S1 can be further set in the power switching device, and the opening and closing of the start switch S1 is utilized to control whether the power supply 1 outputs power.
[0073] For an introduction to a power switching device provided by the present invention, please refer to the above-mentioned embodiment of the power switching circuit, and the present invention will not be described in detail here.
[0074] As an optional embodiment, the first positive power port A1, the second positive power port A2, the third positive power port A3, the first negative power port B1, the second negative power port B2 and the third negative power port B3 are all arranged on the VT board.
[0075] It is not difficult to understand that when applied in a VT power supply, the first positive power port A1, the second positive power port A2, the third positive power port A3, the first negative power port B1, the second negative power port B2 and the third negative power port B3 can be directly set on the VT board and integrated into the VT system; further, the VT7001 in the VT system can be used as a power board to provide power supply 1, and the VT2816 can be used as a measurement module 13 to measure the voltage and output the voltage to the intermediate relay; the specific type and implementation method of the VT board are not particularly limited in this application, and it can be implemented using a VT2820 board or the like.
[0076] Specifically, directly using the board card integrated in the VT system to implement the power supply 1 and the measurement module 13 can further simplify the power switching circuit and the structure of the entire power switching device, making it easier to apply and promote.
[0077] As a specific embodiment, the first power switching scheme can be used in the test process when the normal working current is less than 7A, and the second power switching scheme can be used in the test process when the normal working current is greater than 7A; first, a test environment is set up according to the power conversion circuit provided in the present application, and the DC power supply normally outputs a voltage of 12V. The 12V voltage can make the product 2 to be tested work in a normal state. The positive pole of the product 2 to be tested is connected to channels A2 and B3 of the VT board, and is also connected to pin2 and pin3 of the intermediate relay output end; the negative pole is connected to channels A3 and B2 of the VT board, and is also connected to pin1 and pin4 of the intermediate relay output end, and the tolerance of the product 2 to be tested when a reverse voltage is input is tested. When the power supply is output normally, the following operations are performed for the product under test 2 whose normal working current is less than 7A. The first switch Q1 in the VT board is connected to A3 by default, and the second switch Q2 is connected to B3 by default. The positive and negative poles of the power supply and the positive and negative poles of the product under test 2 are normally connected, and the product under test 2 works normally. When the first switch Q1 is switched to A2 and the second switch Q2 is switched to B2, the positive and negative poles are switched at the power input end of the product, and the ports 1a and 1b of the measurement module 13 are used to measure the voltage. When in a reverse voltage working environment, the measurement module 13 is used to monitor the positive and negative poles of the product under test. Test whether the positive input terminal voltage of product 2 is -12V; after the reverse voltage is output for one minute, disconnect the start switch S1, switch the first switching switch Q1 to A3, and switch the second switching switch Q2 to B3, and then close the start switch S1, the positive and negative poles of the product 2 to be tested return to normal, and the power supply of the product 2 to be tested returns to normal. At this time, use the measurement module 13 to monitor whether the positive input terminal voltage of the product 2 to be tested is 12V, so as to monitor whether all functions of the product 2 to be tested are damaged. If damaged, report to the upper-level operator to assist in troubleshooting the root cause of the problem. If there is no problem, the test passes.
[0078] For the product 2 to be tested whose normal working current is greater than 7A, the following operations are performed: when the VT system does not output voltage, the positive and negative poles of the power supply and the positive and negative poles of the product 2 to be tested are normally connected, and the product 2 to be tested works normally. When the VT system outputs a 12V voltage, the two normally closed switches of the intermediate relay are switched to normally open switches, and the positive and negative poles at the power input end of the product are switched. At the same time, the ports 1a and 1b of the measurement module 13 are used to measure the voltage; the output channels 2a and 2b of the measurement module 13 are controlled to output a 12V voltage. At this time, the normally closed switches of the intermediate relay are all switched to normally open, and the normally open switches are closed. The positive and negative poles of the product 2 to be tested are interchanged, and it is in a reverse voltage working environment. At this time, the measurement module 13 is used to monitor the positive input terminal voltage of the product 2 to be tested as -12V. After one minute, the output voltage of the output channel of the measuring module 13 is turned off, and the intermediate relay returns to its initial state. At this time, the measuring module 13 is used to monitor that the positive input terminal voltage of the product to be tested 2 is 12V. At this time, the power supply of the product to be tested 2 is restored to normal. Monitor all functions of the product for damage. If there is any damage, report it to the upper-level operator to assist in troubleshooting the root cause of the problem. If there is no problem, the test passes.
[0079] The first power switching scheme using the VT board in conjunction with the first switching switch Q1 and the second switching switch Q2 can test small current products and has a high degree of integration; if the normal operating current of the product 2 to be tested is too large, the second power switching scheme using the intermediate relay can be used, and the current flow is better. In this test, the measurement module 13 is set to test the voltage state output to the product 2 to be tested. Because the measurement module 13 supports the measurement of negative pressure, further, if the intermediate relay is used, the channels 2a and 2b of the measurement module 13 can be used as the power supply of the intermediate relay, and the channels 1a and 1b of the measurement module 13 measure the voltage at the same time.
[0080] It is not difficult to understand that based on Figure 2 The test method for the power switching device shown can realize an automated test solution based on the VT system, conduct effective testing on the product 2 to be tested while utilizing existing resources, reduce equipment costs, reduce working hours and realize test automation. The combined use of the intermediate relay and the VT system replaces the power supply that can output negative pressure, which greatly reduces the equipment cost. During the test, there is no need for personnel to manually operate the power supply, which reduces working hours and reduces the risk of personal injury. The test can be automated, and the traceability of the test and the reusability of the test cases are improved while ensuring the accuracy of the test. It covers both large-load products and small-load products and has a wide range of applications.
[0081] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.
[0082] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.
[0083] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A power switching circuit, characterized in that: It includes a first positive power port, a second positive power port, a third positive power port, a first negative power port, a second negative power port, a third negative power port, a first switching switch and a second switching switch, wherein the first positive power port is connected to the positive pole of the power supply, the first negative power port is connected to the negative pole of the power supply, the third positive power port is connected to the positive pole of the product to be tested, and the third negative power port is connected to the negative pole of the product to be tested; a fixed end of the first switching switch is connected to the first positive power port, a first switching end is connected to the second positive power port, a second switching end is connected to the third positive power port, a fixed end of the second switching switch is connected to the first negative power port, a first switching end is connected to the second negative power port, a second switching end is connected to the third negative power port, the second positive power port is connected to the third negative power port, and the second negative power port is connected to the third positive power port; The first switching switch is used to connect its own fixed end and the second switching end when the product under test needs a positive power supply, and to connect its own fixed end and the first switching end when the product under test needs a negative power supply; The second switching switch is used to connect its own fixed end and the second switching end when the product under test needs a positive power supply, and to connect its own fixed end and the first switching end when the product under test needs a negative power supply.
2. The power switching circuit according to claim 1, wherein: It also includes a first overcurrent protection module and a second overcurrent protection module, wherein the first end of the first overcurrent protection module is connected to the positive electrode of the product to be tested, and the second end is connected to the third positive power supply port, and the first end of the second overcurrent protection module is connected to the negative electrode of the product to be tested, and the second end is connected to the third negative power supply port.
3. The power switching circuit according to claim 2, wherein: The first overcurrent protection module and the second overcurrent protection module are both fuses.
4. The power switching circuit according to claim 1, wherein: It also includes a first prompt module and a second prompt module, wherein the first end of the first prompt module is connected to the second positive power port, and the second end is connected to the third negative power port, and the first end of the second prompt module is connected to the second negative power port, and the second end is connected to the third positive power port; The first prompt module is used to execute a corresponding prompt strategy when the power output to the product to be tested is a reverse power supply; The second prompt module is used to execute a corresponding prompt strategy when the power output to the product to be tested is a forward power supply.
5. The power switching circuit according to claim 1, wherein: It also includes a communication module and a host computer, wherein the host computer is connected to the product to be tested through the communication module; The host computer is used to receive the test result of the product to be tested through the communication module.
6. The power switching circuit according to any one of claims 1 to 5, characterized in that: It also includes a third switching switch, a first switching module and a second switching module, the third switching switch includes a first switching sub-switch and a second switching sub-switch, the fixed end of the first switching module is connected to the positive electrode of the power supply, the first switching end is connected to the first positive power port, the second switching end is connected to the fixed end of the second switching sub-switch, the fixed end of the second switching module is connected to the negative electrode of the power supply, the first switching end is connected to the first negative power port, the second switching end is connected to the fixed end of the first switching sub-switch, the first switching end of the first switching sub-switch is connected to the negative electrode of the product to be tested, the second switching end is connected to the positive electrode of the product to be tested, the first switching end of the second switching sub-switch is connected to the positive electrode of the product to be tested, and the second switching end is connected to the negative electrode of the product to be tested; The first switching sub-switch is used to connect its own fixed end and the first switching end when the product under test needs a positive power supply, and to connect its own fixed end and the second switching end when the product under test needs a negative power supply; The second switching sub-switch is used to connect its own fixed end and the first switching end when the product under test needs a positive power supply, and to connect its own fixed end and the second switching end when the product under test needs a negative power supply.
7. The power switching circuit according to claim 6, wherein: The third switching switch is an intermediate relay, the intermediate relay includes a first contact and a second contact, the first switching sub-switch is the first contact, and the second switching sub-switch is the second contact.
8. The power switching circuit according to claim 7, wherein: It also includes a measuring module, wherein a first input terminal of the measuring module is connected to the positive electrode of the product to be tested, and a second input terminal of the measuring module is connected to the negative electrode of the product to be tested; The measuring module is used to measure the magnitude of the output voltage output to the product to be tested.
9. A power switching device, characterized in that: It comprises a VT board, a power supply and a power switching circuit as claimed in any one of claims 1 to 8.
10. The power switching device according to claim 9, wherein: The first positive power port, the second positive power port, the third positive power port, the first negative power port, the second negative power port and the third negative power port are all arranged on the VT board.