Insulation detection circuit, power supply system, vehicle and electric energy equipment
By designing an insulation detection circuit, using the cooperation of the leakage current detection circuit and the switching circuit, the insulation defect point detection without disassembly is achieved, which improves detection efficiency and safety and reduces costs.
Patent Information
- Application Number
- CN202421498439.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-27
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-06-27
AI Technical Summary
In the prior art, it is difficult to check the insulation points of electrical energy equipment and is inefficient, so the equipment needs to be disassembled for inspection.
Design an insulation detection circuit to detect leakage current in the busbar and load power supply circuit through the coordination of the leakage current detection circuit and the switching circuit, so as to realize detection of insulation defect points without disassembly of the equipment.
It improves the detection efficiency of poor insulation points, improves the safety of power supply systems and vehicles, and reduces the detection cost.
Smart Images
Figure CN223180385U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of insulation detection. More specifically, the utility model relates to an insulation detection circuit, a power supply system, a vehicle and an electric energy device. Background Art
[0002] With the wide application of electric energy devices, the safety of electric energy devices has attracted particular attention. In order to detect whether there is a problem with the insulation of an electric energy device, in the prior art, it is usually necessary to disassemble the electric energy device, find the detection points of numerous load device circuits and the main power supply circuit, and perform detection through corresponding detection equipment to determine whether there is leakage. This makes it difficult and inefficient to identify the insulation problem points. Summary of the Utility Model
[0003] Embodiments of the present disclosure provide an insulation detection circuit, a power supply system, a vehicle and an electric energy device, which can improve the efficiency of identifying insulation problem points.
[0004] According to a first aspect of the present utility model, there is provided an insulation detection circuit, comprising:
[0005] A leakage current detection circuit, a first end of the leakage current detection circuit is used to connect to the positive pole of a power supply; a second end of the leakage current detection circuit is used to connect to the negative pole of the power supply;
[0006] A first busbar, the first busbar is connected to the first end of the leakage current detection circuit;
[0007] A second busbar, the second busbar is connected to the second end of the leakage current detection circuit;
[0008] A switch circuit, a first end of the switch circuit is connected to the first busbar, and a second end of the switch circuit is connected to the second busbar; the switch circuit is used to connect loads in series;
[0009] A first switch, the first switch is arranged on the first busbar and is located between the switch circuit and the leakage current detection circuit.
[0010] Optionally, the insulation detection circuit further includes a second switch, the second switch is arranged on the second busbar and is located between the switch circuit and the leakage current detection circuit.
[0011] Optionally, the switch circuit includes a load switch for controlling the access of a load, and the load switch is connected between the first busbar and the second busbar;
[0012] Wherein, when the first switch is closed, the second switch is open, and the load switch of the switch circuit is open, the leakage current detection circuit detects the leakage current between the first end of the power supply and the first bus; when the second switch is closed, the first switch is open, and the load switch of the switch circuit is open, the leakage current detection circuit detects the leakage current of the second bus.
[0013] Optionally, the load switch is a contactor, and the contactor includes a first pair of contacts and a second pair of contacts;
[0014] The first end of the first pair of contacts is connected to the first bus, and the second end of the first pair of contacts is used to be serially connected to one end of the load;
[0015] The first end of the second pair of contacts is connected to the second bus, and the second end of the second pair of contacts is used to be serially connected to the other end of the load.
[0016] Optionally, the insulation detection circuit includes a plurality of the switch circuits;
[0017] When the first switch is conducting, the second switch is conducting, the load switch in the target switch circuit among the plurality of switch circuits is conducting, and the load switches in other switch circuits are open, the leakage current detection circuit detects the leakage current of the target switch circuit; the other switch circuits are the switch circuits other than the target switch circuit among the plurality of switch circuits.
[0018] Optionally, the switch circuit further includes a fuse, and the fuse is connected between the first bus and the load, and the fuse is used to disconnect when the current flowing into the switch circuit is greater than or equal to a current threshold.
[0019] Optionally, the insulation detection circuit further includes a controller, and the controller is used to control the on / off states of the first switch, the second switch, and the load switch.
[0020] Optionally, the insulation detection circuit further includes a display module, and the controller is also communicatively connected to the display module and the leakage current detection circuit.
[0021] According to a second aspect of the present invention, there is provided a power supply system, including a power supply and an insulation detection circuit;
[0022] Wherein, the insulation detection circuit is the insulation detection circuit described in the first aspect, the first bus of the insulation detection circuit is connected to the first end of the power supply, and the second bus of the insulation detection circuit is connected to the second end of the power supply.
[0023] According to a third aspect of the present invention, there is provided a vehicle, including the power supply system described in the second aspect.
[0024] According to a fourth aspect of the present invention, there is provided an electric energy device comprising the power supply system according to the second aspect.
[0025] One technical effect of the present invention is that the insulation detection circuit provided by the present invention can detect leakage current in the bus line when the first switch is closed and the switch circuit is open. If no leakage current is detected in the bus line, the first switch is closed and the switch circuit is closed to detect leakage current in the entire power supply line. Without disassembling the electrical equipment, leakage detection can be performed on the detection points of each load device circuit and the main power supply line, effectively improving the efficiency of detecting poor insulation points.
[0026] With the cooperation of the first switch and the switch circuit, the busbar of the main power supply circuit can be detected for poor insulation, and at the same time, the power supply circuit of the load can be detected for poor insulation, effectively improving the detection efficiency of leakage detection.
[0027] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] The accompanying drawings, which constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.
[0029] Figure 1 is a structural block diagram of an insulation detection circuit according to one embodiment;
[0030] Figure 2 is a circuit diagram of an insulation detection circuit according to one embodiment;
[0031] Figure 3 is a circuit diagram of a leakage current detection circuit according to one embodiment;
[0032] Figure 4 is a block diagram of a vehicle according to one embodiment.
[0033] Description of the drawings:
[0034] Leakage current detection circuit 20; switch circuit 30; load 31; power supply 40; first bus 51; second bus 52; controller 60;
[0035] Insulation detection circuit 100; control system 200; display circuit 300. DETAILED DESCRIPTION
[0036] Various exemplary embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present utility model.
[0037] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way a limitation on the present utility model or its application or use.
[0038] Technologies and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies and devices should be regarded as part of the specification.
[0039] In all examples shown and discussed herein, any specific values should be construed as merely exemplary and not as a limitation. Thus, other examples of the exemplary embodiments may have different values.
[0040] It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, further discussion thereof in subsequent drawings is not required.
[0041] See Figure 1 As shown, the insulation detection circuit of the embodiments of the present disclosure will be described.
[0042] The insulation detection circuit of the embodiments of the present disclosure may include a first bus bar 51, a second bus bar 52, a first switch KM1, a leakage current detection circuit 20, and a switch circuit 30.
[0043] For the leakage current detection circuit 20, the first end of the leakage current detection circuit 20 is used to connect to the positive pole of the power supply; the second end of the leakage current detection circuit 20 is used to connect to the negative pole of the power supply.
[0044] The first bus bar 51 is connected to the first end of the leakage current detection circuit 20, and the second bus bar 52 is connected to the second end of the leakage current detection circuit 20.
[0045] The first end of the switch circuit 30 is connected to the first bus bar 51, the second end of the switch circuit 30 is connected to the second bus bar 52, and the switch circuit 30 is used to connect the load 31 in series. Among them, the load 31 is various electrical equipment such as a motor, a lamp, or a refrigerator, for example.
[0046] The first switch KM1 can be disposed on the first bus bar 51 and is located between the switch circuit 30 and the leakage current detection circuit 20. The first bus bar 51 may be a positive bus bar, and the second bus bar 52 may be a negative bus bar. The first bus bar 51 may also be a negative bus bar, and the second bus bar 52 may also be a positive bus bar, which is not limited herein.
[0047] In some examples, such as Figure 2 shown, the leakage current detection circuit 20 is, for example, Figure 2 the DC insulation detection module JYJC in, and the first end of the leakage current detection circuit 20 can be connected to the first bus 51, and the second end of the leakage current detection circuit 20 can be connected to the second bus 52.
[0048] In this embodiment, the power supply 40 is, for example, Figure 2 the DC power supply DC in.
[0049] In this embodiment, the leakage current detection circuit 20 is, for example, Figure 2 the DC insulation detection module JYJC in, and the DC insulation detection module JYJC can be used to detect the leakage current.
[0050] In other words, by cooperating the first switch KM2 with the leakage current detection circuit 20, the insulation of the bus 50 of the main power supply circuit is detected, and at the same time, the insulation of the power supply circuit where the load 31 is located can also be detected, effectively improving the detection efficiency of the leakage detection. And, the leakage current detection circuit 20 can detect whether there is a leakage current in the bus line. In the case where no leakage current is detected in the bus line, the leakage current detection circuit 20 can further detect whether there is a leakage current in the entire power supply line to determine whether there is a leakage current in the load 31, so as to realize the leakage current detection of different circuits, accurately and effectively locate the insulation defect points, and further improve the safety factor of the power supply system. And, by reusing the leakage current detection circuit 20, the manufacturing cost of the insulation detection circuit can be effectively reduced.
[0051] In some embodiments, such as Figure 2 shown, the insulation detection circuit further includes a second switch KM2, and the second switch KM2 is arranged on the second bus and located between the switch circuit 30 and the leakage current detection circuit 20. In other words, by additionally arranging the second switch KM2, when the first switch KM1 is closed and the second switch KM2 is open, it can be detected whether there is a leakage current on the first bus, and when the second switch KM2 is closed and the first switch KM1 is open, it can be detected whether there is a leakage current on the second bus, so as to further determine whether there is a leakage current in the positive bus or the negative bus, and improve the accuracy of the insulation defect points detected by the insulation detection circuit.
[0052] In some examples, the insulation detection circuit may further include a controller, and the controller can be a control chip, and the control chip can control the closing or opening of the first switch, the closing or opening of the second switch, and the conduction or disconnection of the load switch of the switch circuit, so that the first switch, the second switch, and the load switch are controlled by the same controller, which is easy to coordinate the control.
[0053] In some examples, the first switch KM1 and the second switch KM2 can be various switches, such as composite switches or push-button switches, etc., or can be contactors or relays, etc.
[0054] In some embodiments, as Figure 2 shown, the first end of the first switch KM1 is connected to the first end of the leakage current detection circuit 20, and the second end of the first switch KM1 is connected to the first end of the switch circuit 30; the first end of the second switch KM2 is connected to the second end of the leakage current detection circuit 20, and the second end of the second switch KM2 is connected to the second end of the switch circuit.
[0055] When the first switch KM1 is closed, the second switch KM2 is open, and the switch circuit 30 is open, the leakage current detection circuit 20 detects the leakage current of the positive bus line between the positive pole of the power supply 40 and the first bus 51; when the second switch KM2 is closed, the first switch KM1 is open, and the switch circuit 30 is open, the leakage current detection circuit 20 detects the leakage current of the negative bus line between the negative pole of the power supply 40 and the second bus 52.
[0056] In other words, by setting the first switch and the second switch, the leakage current detection circuit 20 can detect the leakage current of the positive bus line or the negative bus line to further check for insulation faults in the power supply line.
[0057] In some embodiments, when the first switch KM1 is closed, the second switch KM2 is closed, and the switch circuit 30 is conducting, the leakage current detection circuit 20 detects the leakage current of the power supply line between the power supply 40 and the switch circuit 30.
[0058] In other words, when the first switch KM1 and the second switch KM2 are both closed, the switch circuit 30 conducts to enable the leakage current detection circuit 20 to detect whether there is a leakage current in the switch circuit 30.
[0059] In some examples, as Figure 3 shown, the leakage current detection circuit is a DC insulation detection module JYJC. When the first switch and the second switch are open, the inside of the leakage current detection circuit remains balanced. When the first switch is closed, the second switch is open, and the switch circuit is open, the voltages Um and Uj can be detected, and, when the resistance R is known, the resistance values of the resistors R+ and R- can be obtained. When the resistance R+ of the first bus is less than the set threshold, an alarm signal can be issued to indicate that the insulation performance of the first bus is poor and there is a leakage current. After the first switch is closed and the leakage current detection circuit does not detect an insulation fault in the first bus, the first switch can be opened, the second switch can be closed, and the switch circuit can be opened to continue monitoring whether there is an insulation fault in the second bus.
[0060] In some embodiments, the switching circuit includes a load switch for controlling the access of a load; the load switch is connected between a first bus and a second bus; wherein, the leakage current detection circuit detects the leakage current between the first end of the power supply and the first bus when the first switch is closed, the second switch is open, and the load switch of the switching circuit is open; and detects the leakage current of the second bus when the second switch is closed, the first switch is open, and the load switch of the switching circuit is open.
[0061] In some examples, the number of load switches can be one, two, or more, which is not limited herein. The load switch can be disposed between the first bus and the load, or between the second bus and the load, which is not limited herein. When the load switch is open, the switching circuit is open, enabling the leakage current detection circuit to detect whether there is a leakage current in the bus line. When there is no leakage current in the bus line, the load switch is closed and the switching circuit is conductive, enabling the leakage current detection circuit to detect whether there is a leakage current in the switching circuit. In other words, by setting the load switch, insulation defect points in the switching circuit or the bus line can be effectively detected. The load switch can be various types of switches, such as a composite switch or a push-button switch, etc., or can be a contactor or a relay, etc.
[0062] In some embodiments, the insulation detection circuit further includes a fuse, which is connected between the first bus and the load and is used to disconnect when the current flowing into the switching circuit is greater than or equal to a current threshold.
[0063] In this embodiment, the fuse can also be replaced with an intelligent switch or a circuit breaker, etc., and the fuse can be closed when the switching circuit is conductive. The current threshold of the fuse can be configured according to the requirements of different loads, which is not limited herein.
[0064] In some examples, as Figure 2 shown, each switching circuit 30 is configured with a control switch, and the control switch can be connected between the first bus 51 and the first pair of contacts of the switching circuit 30. Taking the control switch as the control switch QF1, the control switch QF1 can be connected between the first bus 51 and the first pair of contacts KA1 of the load switch. The control switch can also be connected between the second bus and the second pair of contacts KA2 of the load switch, which is not limited herein. In other words, by setting the control switch, short-circuit protection is provided for the load circuit, effectively improving the safety factor of the insulation detection circuit.
[0065] In some embodiments, the load switch is a contactor, and the contactor includes a first pair of contacts and a second pair of contacts. The first end of the first pair of contacts is connected to the first bus, and the second end of the first pair of contacts is used to be connected in series with one end of the load; the first end of the second pair of contacts is connected to the second bus, and the second end of the second pair of contacts is used to be connected in series with the other end of the load.
[0066] In some examples, such as Figure 2 shown, taking the first pair of contacts as the first pair of contacts KA1, the second pair of contacts as the second pair of contacts KB1, and the load as Z1 as an example, the first end of the first pair of contacts KA1 is connected to the control switch QF1, the second end of the first pair of contacts KA1 is connected to one end of the load Z1, the first end of the second pair of contacts KB1 is connected to the second bus 52, and the second end of the second pair of contacts KB1 is connected to the other end of the load Z1.
[0067] In other words, by setting the load switch as a contactor, it is possible to detect whether there is a leakage current in the positive pole of the switch circuit 30 or the load, further improving the troubleshooting efficiency of the insulation detection circuit for insulation failure points.
[0068] In some embodiments, the insulation detection circuit includes a plurality of switch circuits. When the first switch is turned on, the second switch is turned on, the load switch in the target switch circuit among the plurality of switch circuits is turned on, and the load switches in the other switch circuits are turned off, the leakage current detection circuit detects the leakage current of the target switch circuit. The other switch circuits are the switch circuits other than the target switch circuit among the plurality of switch circuits.
[0069] In some examples, such as Figure 2 shown, there are n switch circuits 30, where n is greater than 3 and n is a positive number. The first pair of contacts of the target switch circuit are, for example, the first pair of contacts KA1, the control switch of the target switch circuit is, for example, the control switch QF1, the load of the target switch circuit is, for example, the load Z1, and the second pair of contacts of the target switch circuit are, for example, the second pair of contacts KB1. That is to say, when detecting whether there is a leakage current in the bus line, the first contact KA1 - the first contact KAn and the second contact KB1 - the second contact KBn are disconnected, the first switch KM1 is closed, and the second switch KM2 is closed.
[0070] When no leakage current is detected in the bus line, to detect whether there is a leakage current in the target switch circuit, the first pair of contacts KA1 is closed, the first pair of contacts KA2 - the first pair of contacts KAn are disconnected, the second pair of contacts KB1 is closed, the second pair of contacts KB2 - the second pair of contacts KBn are disconnected, the first switch KM1 is closed, and the second switch KM2 is closed to detect whether there is a leakage current in the target switch circuit.
[0071] In other words, when there are multiple switch circuits, it is possible to control each switch circuit, the first switch to be turned off or on, and the second switch to be turned off or on to detect whether there is a leakage current in each switch circuit, further improving the troubleshooting of insulation failure points in the insulation detection circuit.
[0072] In some embodiments, such as Figure 4As shown, the insulation detection circuit further includes a display module 300. The controller 60 is, for example, a controller in a Train Control and Manage System (TCMS). The controller 60 is also communicatively connected to the display module 300 and the leakage current detection circuit 20. The display module 300 is, for example, a display screen in a vehicle. When the leakage current detection circuit 20 detects a leakage current in the bus line or the power supply line, it feeds back a corresponding alarm signal to the controller 60. The controller 60 can display the information that a leakage current is detected in the bus line or the power supply line to the driver through the display module 300.
[0073] According to the power supply system provided by an embodiment of the present disclosure, the power supply system includes a power supply, a load device, and an insulation detection circuit. The insulation detection circuit is the insulation detection circuit of any of the above embodiments. The insulation detection circuit is connected between the power supply and the load device. In other words, by configuring the insulation detection circuit in the power supply system, the efficiency of detecting insulation defects in the power supply system can be effectively improved. Moreover, the leakage current detection circuit in the insulation detection circuit can be reused, reducing the manufacturing cost of the power supply system.
[0074] According to the vehicle provided by an embodiment of the present disclosure, the vehicle includes the insulation detection circuit of any of the above embodiments or the power supply system of any of the above embodiments. The vehicle is, for example, a rail vehicle, an electric vehicle, or a fuel vehicle, etc., which is not limited herein. In other words, by configuring the insulation detection circuit or the power supply system in the vehicle, the efficiency of detecting insulation defects in the vehicle can be effectively improved. Moreover, the leakage current detection circuit in the insulation detection circuit can be reused, reducing the manufacturing cost of the vehicle.
[0075] According to the electrical energy device provided by an embodiment of the present disclosure, the electrical energy device includes the insulation detection circuit of any of the above embodiments or the power supply system of any of the above embodiments. The electrical energy device is, for example, a vehicle, an aircraft, or an energy storage cabinet, etc., which is not limited herein. In other words, by configuring the insulation detection circuit or the power supply system in the electrical energy device, the efficiency of detecting insulation defects in the electrical energy device can be effectively improved. Moreover, the leakage current detection circuit in the insulation detection circuit can be reused, reducing the manufacturing cost of the electrical energy device.
[0076] Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.
Claims
1. An insulation detection circuit, characterized in that, Comprising: A leakage current detection circuit, the first end of the leakage current detection circuit is used to connect to the positive pole of the power supply; the second end of the leakage current detection circuit is used to connect to the negative pole of the power supply. A first busbar, the first busbar is connected to the first end of the leakage current detection circuit. A second busbar, the second busbar is connected to the second end of the leakage current detection circuit. A switching circuit, the first end of the switching circuit is connected to the first busbar, and the second end of the switching circuit is connected to the second busbar; the switching circuit is used to connect the load in series. A first switch, the first switch is arranged on the first busbar and is located between the switching circuit and the leakage current detection circuit.
2. The insulation detection circuit according to claim 1, wherein The insulation detection circuit further includes a second switch, the second switch is arranged on the second busbar and is located between the switching circuit and the leakage current detection circuit.
3. The circuit according to claim 2, wherein The switching circuit includes a load switch for controlling the access of the load, and the load switch is connected between the first busbar and the second busbar. Wherein, the leakage current detection circuit detects the leakage current between the first end of the power supply and the first busbar when the first switch is closed, the second switch is open and the load switch of the switching circuit is open; and detects the leakage current of the second busbar when the second switch is closed, the first switch is open and the load switch of the switching circuit is open.
4. The insulation detection circuit according to claim 3, wherein, The load switch is a contactor, and the contactor includes a first pair of contacts and a second pair of contacts. The first end of the first pair of contacts is connected to the first busbar, and the second end of the first pair of contacts is used to connect one end of the load in series. The first end of the second pair of contacts is connected to the second busbar, and the second end of the second pair of contacts is used to connect the other end of the load in series.
5. The insulation detection circuit according to claim 3, characterized in that, The insulation detection circuit includes a plurality of the switching circuits. When the first switch is turned on, the second switch is turned on, the load switch in the target switching circuit among the plurality of switching circuits is turned on, and the load switches in other switching circuits are turned off, the leakage current detection circuit detects the leakage current of the target switching circuit; the other switching circuits are the switching circuits other than the target switching circuit among the plurality of switching circuits.
6. The insulation detection circuit according to claim 3, characterized in that, The switching circuit further includes a fuse, the fuse is connected between the first busbar and the load, and the fuse is used to disconnect when the current flowing into the switching circuit is greater than or equal to a current threshold.
7. The insulation detection circuit according to claim 3, wherein The insulation detection circuit further includes a controller, and the controller is used to control the on-off states of the first switch, the second switch and the load switch.
8. The insulation detection circuit according to claim 7, wherein The insulation detection circuit further includes a display module, and the controller is also communicatively connected to the display module and the leakage current detection circuit.
9. A power supply system, characterized in that, Comprising a power supply and an insulation detection circuit. Wherein, the insulation detection circuit is the insulation detection circuit according to any one of claims 1 to 8, the first busbar of the insulation detection circuit is connected to the first end of the power supply, and the second busbar of the insulation detection circuit is connected to the second end of the power supply.
10. A vehicle, characterized in that, Comprising the power supply system according to claim 9.
11. An electrical energy device, characterized in that, Comprising the power supply system according to claim 9.