Soft landing discharge device

Abstract

The application provides a slow descent discharging device, which is suitable for a withstand voltage tester. The withstand voltage tester is provided with a first terminal and a second terminal. The slow descent discharging device comprises a test unit, a voltage reduction unit, a first relay structure and a control unit. The test unit comprises a first branch and a second branch. The first branch is electrically connected with the first terminal, and the second branch is electrically connected with the second terminal. The voltage reduction unit is electrically connected with the first branch and the second branch respectively. The control unit is electrically connected with the voltage reduction unit through the first relay structure, and is used for controlling the on-off state between the voltage reduction unit and the test unit. Through the application of the voltage reduction unit, the first relay structure and the control unit, the discharging effect of the measured element can be improved, the test period can be shortened, and the production efficiency of the measured element can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of voltage withstanding test, and particularly to a slow descent discharging device. BACKGROUND

[0002] New energy vehicles usually use a voltage withstanding tester to test the electrical performance of the controller structure of the motor system. However, due to the large capacitance of the controller structure, a high voltage is generated after the end of the safety test, which affects the application safety of the controller structure and other measured elements.

[0003] To ensure that the measured element can be safely used, the slow descent time of the measured element is currently extended to reduce the voltage to a safe level. However, due to the limited discharging capacity of the voltage withstanding tester, the discharging speed of the measured element is relatively slow, which significantly affects the production efficiency of the controller and even the vehicle. CONTENT OF THE INVENTION

[0004] Therefore, the present application aims to provide a slow descent discharging device to solve some or all of the above technical problems.

[0005] To achieve the above purpose, the present application provides a slow descent discharging device suitable for a voltage withstanding tester, wherein the voltage withstanding tester is provided with a first terminal and a second terminal; the slow descent discharging device comprises a test unit, a voltage reduction unit, a first relay structure, and a control unit.

[0006] The test unit comprises a first branch and a second branch, the first branch is electrically connected to the first terminal, and the second branch is electrically connected to the second terminal.

[0007] The voltage reduction unit is electrically connected to the first branch and the second branch, respectively.

[0008] The control unit is electrically connected to the voltage reduction unit through the first relay structure, and is used to control the on-off state between the voltage reduction unit and the test unit.

[0009] As can be seen from the above, the slow descent discharging device provided by the present application can connect the voltage reduction unit and the test unit through the first relay structure after the completion of the safety test, and use the voltage reduction unit to quickly discharge the measured element to ensure that the voltage can quickly drop to a safe level or zero, thereby accelerating the discharging rate of the measured element, shortening the test time, and improving the overall production efficiency. During the safety test, the control unit can disconnect the voltage reduction unit and the test unit through the first relay structure to prevent the voltage reduction unit from interfering with the safety test and ensure the accuracy of the detection results of the voltage withstanding tester. BRIEF DESCRIPTION OF DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced. Obviously, the accompanying drawings in the following description only need to be some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0011] Figure 1 The structural diagram of the slow descent discharge device in the present application;

[0012] Figure 2 The schematic diagram of the slow descent discharge device in the present application;

[0013] Figure 3 The schematic diagram of the first relay structure in the present application;

[0014] Figure 4 The schematic diagram of the second relay structure in the present application;

[0015] Figure 5 The voltage change schematic diagram of the measured component in the pressurization stage, the test stage and the pressure reduction stage in the present application.

[0016] Explanation of reference signs:

[0017] 1, voltage withstanding tester; 101, first terminal; 102, second terminal; 103, measured element;

[0018] 2, test unit; 210, first branch; 211, first wiring terminal; 220, second branch; 221, second wiring terminal;

[0019] 3, pressure reduction unit; 301, indication module; 310, discharge component;

[0020] 4, first relay structure; 410, first switch; 420, first control module;

[0021] 5, control unit; 510, power supply; 511, first electrode; 512, second electrode; 520, second relay structure; 521, second switch; 522, second control module;

[0022] 6, signal monitoring module. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present application more clear, the present application will be further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0024] It should be noted that the technical terms or scientific terms used in the embodiments of the present application should be understood as the general meaning understood by those skilled in the art to which the present application belongs, unless otherwise defined. The terms "first", "second", and the like used in the present application do not represent any order, quantity or importance, but are only used to distinguish different components. The terms "include" or "contain" and the like mean that the components or components listed after the terms include the components or components listed after the terms and their equivalents, and do not exclude other components or components. The terms "connected" or "connected" and the like are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right" and the like are only used to represent the relative positional relationship, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0025] Due to the capacitor structure of the motor system controller, the controller structure may store a high residual voltage after the end of the withstand voltage test, which seriously threatens the safety of the controller structure and the vehicle using the controller structure. In order to ensure the safety of the measured elements such as the controller structure, the commonly used method at present is to prolong the slow descent time of the withstand voltage tester to gradually reduce the voltage to a safe level. However, on the one hand, due to the limited discharge capacity of the withstand voltage tester itself, it cannot guarantee that the voltage will be reduced to within the safe range in all cases; secondly, for the measured components with a large capacitance value, the voltage reduction process is relatively slow and time-consuming, which may cause the test progress to lag significantly and affect the production efficiency of the controller structure and even the vehicle.

[0026] In view of this, the present application provides a slow descent discharge device suitable for a withstand voltage tester 1, which combines Figures 1-5 The slow descent discharge device will be described in detail.

[0027] A slow descent discharge device suitable for a withstand voltage tester 1, the withstand voltage tester 1 is provided with a first terminal 101 and a second terminal 102, which can be used as the positive output terminal and the negative output terminal of the withstand voltage tester 1 to output a test voltage; the slow descent discharge device comprises a test unit 2, a voltage reduction unit 3, a first relay structure 4 and a control unit 5; the test unit 2 comprises a first branch 210 and a second branch 220, the first branch 210 is electrically connected with the first terminal 101, and the second branch 220 is electrically connected with the second terminal 102; the voltage reduction unit 3 is electrically connected with the first branch 210 and the second branch 220 respectively; the control unit 5 is turned on with the voltage reduction unit 3 through the first relay structure 4, to control the on-off state between the voltage reduction unit 3 and the test unit 2.

[0028] As Figure 1 and Figure 2As shown, the test unit 2 includes a first branch 210 and a second branch 220, which are respectively electrically connected with the first terminal 101 and the second terminal 102; when the measured element 103 is subjected to the safety test, the first branch 210 and the second branch 220 are both electrically connected with the measured element 103, so as to build an electrical connection relationship between the withstand voltage tester 1 and the measured element 103 and form a test circuit structure, and after a test voltage is applied to the measured element 103, the withstand voltage test or the leakage current test of the measured element 103 can be completed through the test unit 2.

[0029] As shown in Figure 1 and Figure 2 , since the measured element 103 has a capacitance, a residual voltage will be generated in the measured element 103 after the safety test is completed; therefore, by electrically connecting the voltage reduction unit 3 with the first branch 210 and the second branch 220 respectively, the electrical connection relationship between the withstand voltage tester 1 and the measured element 103 can be disconnected at the end of the safety test, so that the measured element 103 and the voltage reduction unit 3 form a voltage reduction unit 3 structure; the measured element 103 can be discharged by the voltage reduction unit 3, and the electrical energy stored in the measured element 103 during the test stage is consumed, so that the voltage of the measured element is quickly reduced to a safe voltage, which is beneficial to improve the discharge speed of the measured element 103 and shorten the test period, thereby improving the production efficiency of the controller.

[0030] As shown in Figures 1-3 , the control unit 5 is electrically connected with the voltage reduction unit 3 through the first relay structure 4, since the voltage of the measured element 103 is high after the safety test is completed, a high-voltage circuit will be formed after the test unit 2 connected with the measured element 103 is switched into the voltage reduction unit 3, therefore, the control unit 5 can control the electrical connection relationship between the test unit 2 and the voltage reduction unit 3 by using the first relay structure 4 according to the stage of the measured element 103, so as to meet different working states of the measured element 103. Specifically, when it is determined that the measured element 103 is in the safety test stage, the control unit 5 controls the voltage reduction unit 3 to be disconnected with the measured element 103 through the first relay structure 4, so as to avoid the interference of the voltage reduction unit 3 to the safety test stage and ensure the test accuracy of the withstand voltage tester 1 to the measured element 103.

[0031] More specifically, when it is determined that the measured element 103 completes the safety test, the control unit 5 can control the voltage reduction unit 3 to be turned on with the measured element 103 through the first relay structure 4, at this time, the measured element 103 forms a discharge circuit structure between the first branch 210 and the second branch 220 of the test unit 2 and the voltage reduction unit 3, so as to discharge the measured element 103, so that the voltage of the measured element 103 is quickly reduced, and the safety of the measured element 103 in the later stage is ensured.

[0032] In some embodiments, the first branch 210 is provided with a first terminal 211, the second branch 220 is provided with a second terminal 221, the voltage reduction unit 3 is electrically connected to the first branch 210 through the first terminal 211, and the first relay structure 4 is electrically connected to the second branch 220 through the second terminal 221; therefore, the first terminal 211 can serve as a connection point of the first branch 210 and the first relay structure 4, and the second terminal 221 can serve as a connection point of the voltage reduction unit 3 and the first relay structure 4, so as to build an electrical connection relationship among the voltage reduction unit 3, the first relay structure 4 and the test unit 2.

[0033] In some embodiments, the voltage reduction unit 3 comprises a discharge component 310, which is electrically connected to the first terminal 211 and the first relay structure 4 respectively. As shown in Figure 1 After the end of the regulatory test phase, the measured element 103 is intervened into the voltage reduction unit 3 through the test unit 2 and forms a discharge circuit structure, the voltage and current released by the measured element 103 are directly applied to the discharge component 310, the electrical energy is consumed through the discharge component 310, so that the voltage of the measured element 103 gradually drops below the safe voltage, thereby completing the discharge processing of the measured element 103.

[0034] Exemplarily, the discharge component 310 is an adjustable resistor, and the resistance value can be adaptively adjusted according to the capacitance value of the measured element 103, so as to ensure sufficient consumption of the electrical energy of the measured element 103.

[0035] In some embodiments, an indication module 301 for detecting the discharge condition is arranged between the first terminal 211 and the discharge component 310. As shown in Figure 1 When the measured element 103 is discharged, the indication module 301 electrically connected to the first terminal 211 and the discharge component 310 respectively can detect the discharge condition of the measured element 103, and can generate corresponding electrical parameter information, so that the user can timely understand the voltage reduction condition of the measured element 103, and ensure the safety of the later application of the measured element 103.

[0036] Exemplarily, the indication module 301 can be an electrical parameter instrument, and the electrical parameters displayed by the electrical parameter instrument can determine whether the measured element 103 drops within the safe voltage.

[0037] In some embodiments, the first relay structure 4 comprises a first switch 410 and a first control module 420; wherein the first switch 410 is electrically connected to the voltage reduction unit 3 and the second terminal 221 respectively; and the first control module 420 is electrically connected to the control unit 5.

[0038] Specifically, as shown in Figure 1 and Figure 3As shown, the first relay structure 4 is connected with the control unit 5 and the voltage reduction unit 3 respectively, so that the control unit 5 controls the voltage reduction unit 3 to be connected to the test unit 2 through the first relay structure 4, and the measured element 103 is connected to the test unit 2 and the voltage reduction unit 3 to implement the discharge process; more specifically, the first switch 410 is electrically connected with the voltage reduction unit 3 and the second terminal 221 respectively, when the first switch 410 is open, the voltage reduction unit 3 is not connected to the test unit 2, so that the test circuit structure is formed between the voltage withstanding tester 1, the test unit 2 and the measured element 103, so that the voltage withstanding tester 1 can accurately test the measured element 103 to prevent the voltage reduction unit 3 from interfering with the safety test phase; when the first switch 410 is closed, the voltage reduction unit 3 is connected to the measured element 103 through the test unit 2, so that the discharge circuit structure is formed between the measured element 103, the test unit 2 and the voltage reduction unit 3, so as to discharge the measured element 103 to achieve rapid voltage reduction of the measured element 103 and improve the test efficiency of the measured element 103.

[0039] More specifically, the first control module 420 is electrically connected with the control unit 5, so that the control unit 5 controls the opening and closing state of the first switch 410 through the first control module 420; in the safety test phase, the control unit 5 can drive the first switch 410 to be open through the first control module 420; and in the voltage reduction process phase, the control unit 5 can drive the first switch 410 to be closed through the first control module 420.

[0040] For example, the first switch 410 can adopt a contact switch, and the first control module 420 can adopt an electromagnetic mechanism; specifically, when the control unit 5 applies a current signal to the electromagnetic mechanism, the electromagnetic mechanism will form a magnetic field and drive the normally open contact of the contact switch to change the contact state, so that the normally open contact is closed and the discharge circuit structure is formed to discharge the measured element 103; when the current signal of the control unit 5 disappears, the magnetic field disappears, and the normally open contact of the contact switch returns to the initial state, i.e. in the open state.

[0041] In some embodiments, the first relay structure 4 is a high-voltage relay. By applying a high-voltage relay, the control unit 5 can control the on-off state between the test unit 2 and the voltage reduction unit 3 with low-voltage signals or small-current signals, thereby improving the safety of controlling the voltage reduction unit 3; in addition, when a high-voltage relay is used as the first relay structure 4, the complexity of the voltage reduction discharge device structure is relatively low, which helps to control the manufacturing cost of the voltage reduction discharge device.

[0042] In some embodiments, the control unit 5 comprises a power supply 510 and a second relay structure 520; wherein the power supply 510 comprises a first electrode 511 and a second electrode 512, the second electrode 512 is electrically connected with the first relay structure 4; the second relay structure 520 is electrically connected with the first relay structure 4, and is also electrically connected with the first electrode 511 and the second electrode 512 respectively.

[0043] As shown in Figure 1 , the power supply 510 can serve as the power source of the control unit 5, and the first electrode 511 and the second electrode 512 thereof are electrically connected with the second relay structure 520 respectively to provide electric energy for the second relay structure 520.

[0044] Exemplarily, the power supply 510 can be a 24V low-voltage power supply 510, one of the first electrode 511 and the second electrode 512 thereof is a positive electrode, and the other is a negative electrode, which will not be described here again.

[0045] Specifically, during the discharging phase of the measured element 103, the power supply 510 can be electrically connected with the second relay structure 520, at this time the first relay structure 4 and the power supply 510 are conducted through the second relay structure 520 to drive the first control module 420 of the first relay structure 4 to operate through the power supply 510, so that the first control module 420 drives the first switch 410 to close, and then the measured element 103 is conducted with the voltage reduction unit 3 through the test unit 2 and forms a discharging circuit structure, thereby realizing the rapid discharging of the measured element 103.

[0046] More specifically, during the safety testing phase of the measured element 103, the power supply 510 can be disconnected with the second relay structure 520, at this time the second relay structure 520 no longer maintains the conduction relationship between the first relay structure 4 and the power supply 510; therefore, the first control module 420 driven by the power supply 510 cannot keep the first switch 410 closed, that is, the voltage reduction unit 3 is disconnected with the test unit 2, at this time the interference of the voltage reduction unit 3 to the test unit 2 can be reduced.

[0047] In some embodiments, the second relay structure 520 comprises a second switch 521 and a second control module 522; the second switch 521 is electrically connected with the first relay structure 4 and the first electrode 511 respectively; the second control module 522 is electrically connected with the first electrode 511 and the second electrode 512 respectively.

[0048] As shown in Figure 1 and Figure 4As shown, the first electrode 511 and the second electrode 512 of the power supply 510 are respectively in conduction with the second control module 522, so as to supply power to the second control module 522 to drive the second switch 521 to maintain a closed state through the second control module 522. Since the second switch 521 is electrically connected with the first relay and the first electrode 511 respectively, when the second switch 521 is closed, the first relay structure 4 is electrically connected with the first electrode 511 and the second electrode 512 respectively. At this time, the power supply 510 provides current or voltage for the first relay structure 4 to control the on-off state between the voltage reduction unit 3 and the test unit 2 through the first relay structure 4.

[0049] For example, the second switch 521 can be a contact switch, and the second control module 522 can be a timing electromagnetic mechanism, such as Figure 5 As shown, Figure 5 t0-t1 in the timing electromagnetic mechanism is the pressure stage of the measured element 103, t1-t2 is the safety test stage of the measured element 103, t2-t3 is the voltage reduction stage of the measured element 103, V0 is the safety voltage, and V1 is the test voltage. Specifically, the timing electromagnetic mechanism is in a dormant state and does not form a magnetic field during t0-t1 and t1-t2, so the normally open contact of the contact switch does not close, and the first relay structure 4 cannot control the electrical connection between the test unit 2 and the voltage reduction unit, so as to avoid the influence of the voltage reduction circuit on the safety test effect of the measured element 103. During the t2-t3 time period, the measured element 103 is in the voltage reduction stage, so the timing electromagnetic mechanism can form a magnetic field during the t2-t3 time period. The magnetic field drives the normally open contact of the contact switch to change the contact state, so that the normally open contact is closed, and then the first relay structure 4 is in conduction with the first electrode 511 and the second electrode 512 of the power supply 510. At this time, the first relay structure 4 can make the voltage reduction unit 3, the test unit 2 and the measured element 103 form a discharge circuit structure to discharge the measured element 103.

[0050] In some embodiments, the second relay structure 520 is a delay relay. Specifically, when the delay relay is used as the second relay structure 520, on the one hand, the periodic conduction between the power supply 510 and the first relay can be realized through the delay relay, which improves the automation degree of the slow descent discharge device and improves the test efficiency of the measured element 103. On the other hand, the use of the delay relay can reduce the complexity of the slow descent discharge device and reduce the manufacturing cost.

[0051] In some embodiments, the voltage withstanding tester 1 is connected with a signal monitoring module 6 for acquiring a test signal of the voltage withstanding tester 1. The signal monitoring module 6 is electrically connected with the first electrode 511 and the second relay structure 520 respectively. The signal monitoring module 6 controls the opening and closing state of the second relay structure 520 according to the acquisition condition of the test signal.

[0052] Specifically, as shown in Figure 1 and Figure 2 When the signal monitoring module 6 acquires the test signal of the voltage withstanding tester 1, it indicates that the measured element 103 is in the safety test stage, at this time, the signal monitoring module 6 can be switched to the open state, that is, the second relay structure 520 is disconnected with the first electrode 511, and then the power supply 510 is disconnected with the first relay structure 4, so that the voltage reduction unit 3 will not be conducted with the test unit 2, and will not interfere with the safety test stage of the measured element 103; When the signal monitoring module 6 does not acquire the test signal of the voltage withstanding tester 1, it indicates that the measured element 103 is in the voltage reduction stage, at this time, the signal monitoring module 6 can be switched to the closed state, that is, the first relay structure 4 is conducted between the first electrode 511, so that the measured element 103 test unit 2 and the voltage reduction unit 3 are conducted and constitute a discharge circuit structure, so as to realize the rapid discharge and voltage reduction of the measured element 103.

[0053] It should be noted that the signal monitoring module 6 is directly connected with the first electrode 511 of the power supply 510, and is electrically connected with the second electrode 512 of the power supply 510 through the second control module 522 of the second relay structure 520, so that the power supply 510 can drive the signal monitoring module 6 to operate in real time, which will not be repeated here.

[0054] Exemplarily, the signal monitoring module 6 can adopt a signal check relay.

[0055] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims.

[0056] Each of the embodiments in the present application is described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between the embodiments can be referred to each other.

[0057] The description of the present application is given for example and description, and is not exhaustive or limits the present application to the disclosed form. Many modifications and changes are obvious to those skilled in the art. The embodiments are selected and described in order to better illustrate the principles and practical application of the present application, and to enable those skilled in the art to understand the present application so as to design various embodiments with various modifications suitable for specific purposes.

[0058] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and not intended to limit the scope of the application (including the claims) in any way. Such embodiments and / or steps of such embodiments can be selected and combined by those skilled in the art to implement the application in its various aspects, and such steps can be implemented in any order, and are not limited to the order shown in the figures or described above. Many other variations in the above-described embodiments and / or steps of such embodiments are possible, and departures from such embodiments can be made without departing from the scope of the application.

[0059] Although the application has been described in conjunction with specific embodiments thereof, it will be appreciated that many alternatives, modifications and variations will be apparent to those skilled in the art.

[0060] It is intended to include all such alternatives, modifications and variations in the scope of the present application. It is intended that the appended claims cover all such alternatives, modifications and variations as falling within the scope of the present application.

Claims

1. A slow-descent discharge device, suitable for a withstand voltage tester, characterized in that, The withstand voltage tester is provided with a first terminal and a second terminal; the slow-release device includes a test unit, a voltage reduction unit, a first relay structure, and a control unit. The test unit includes a first branch and a second branch, wherein the first branch is electrically connected to the first terminal and the second branch is electrically connected to the second terminal; The step-down unit is electrically connected to the first branch and the second branch, respectively; The control unit is electrically connected to the step-down unit through the first relay structure to control the on / off state between the step-down unit and the test unit.

2. The slow-fall discharge device according to claim 1, characterized in that, The first branch is provided with a first terminal, and the second branch is provided with a second terminal. The step-down unit is electrically connected to the first branch through the first terminal, and the first relay structure is electrically connected to the second branch through the second terminal.

3. The slow-fall discharge device according to claim 2, characterized in that, The step-down unit includes: The discharge component is electrically connected to the first terminal and the first relay structure, respectively.

4. The slow-fall discharge device according to claim 3, characterized in that, An indicator module for detecting the discharge status is provided between the first terminal and the discharge component.

5. The slow-fall discharge device according to claim 4, characterized in that, The first relay structure includes: A first switch is electrically connected to both the step-down unit and the second terminal. A first control module is electrically connected to the control unit.

6. The slow-fall discharge device according to claim 4, characterized in that, The first relay is a high-voltage relay.

7. The slow-fall discharge device according to claim 1, characterized in that, The control unit includes: The power supply includes a first electrode and a second electrode, wherein the second electrode is electrically connected to the first relay structure. The second relay structure is electrically connected to the first relay structure and is also electrically connected to the first electrode and the second electrode, respectively.

8. The slow-fall discharge device according to claim 7, characterized in that, The second relay structure includes: The second switch is electrically connected to the first relay structure and the first electrode, respectively. The second control module is electrically connected to both the first electrode and the second electrode.

9. The slow-fall discharge device according to claim 7, characterized in that, The second relay is a time-delay relay.

10. The slow-fall discharge device according to claim 7, characterized in that, The withstand voltage tester is connected to a signal monitoring module for acquiring the test signal from the withstand voltage tester. The signal monitoring module is electrically connected to the first electrode and the second relay structure respectively, and the signal monitoring module controls the opening and closing state of the second relay structure according to the acquisition of the test signal.

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