Insulation detection device and method and charging pile

Abstract

The invention provides an insulation detection device and method and a charging pile, the insulation detection device comprises a high voltage dividing unit, an operational amplification unit and a controller, and the operational amplification unit is connected with the high voltage dividing unit and the controller; the high-voltage voltage dividing unit comprises a detection circuit and a switching circuit, and the detection circuit is connected with the switching circuit to form a direct-current leakage detection loop or an alternating-current leakage detection loop. According to the application, a direct current leakage detection function can be realized through the direct current leakage detection loop when direct current leakage detection needs to be carried out, and an alternating current leakage detection function can be realized through the alternating current leakage detection loop when alternating current leakage detection needs to be carried out. In addition, the direct current leakage detection loop and the alternating current leakage detection loop multiplex part of circuit structures, so that the utilization rate of the whole circuit is high, and the cost is low. And on the other hand, an alternating current leakage detection result and a direct current detection result can be combined, so that leakage fault points can be more comprehensively positioned.

Description

Technical Field

[0001] The present application relates to the field of leakage detection of charging piles, and more specifically, to an insulation detection device, method and charging pile. Background Art

[0002] At present, among the many technical links of charging piles, high-voltage insulation protection is crucial. Because the human body will have zero-distance contact with the charging pile, insulation detection cannot be ignored, otherwise it may cause great harm to the human body.

[0003] When testing a DC charging pile, the traditional design only performs insulation testing on the DC output part of the charging pile, and cannot perform insulation testing on the AC part of the charging pile. Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide an insulation detection device, method and charging pile, which are used at least to perform DC leakage detection on the charging pile and AC leakage detection on the charging pile.

[0005] In a first aspect, the present invention provides an insulation detection device, comprising: a high-voltage voltage divider unit, an operational amplifier unit, and a controller, wherein the operational amplifier unit is connected to the high-voltage voltage divider unit and the controller; The high-voltage voltage divider unit includes a detection circuit and a switch circuit, wherein the detection circuit is connected to the switch circuit to form a DC leakage detection loop or an AC leakage detection loop.

[0006] The insulation detection device of the first aspect of the present application includes a high-voltage voltage divider unit, an operational amplifier unit and a controller, wherein the operational amplifier unit is connected to the high-voltage voltage divider unit and the controller; the high-voltage voltage divider unit includes a detection circuit and a switching circuit, wherein the detection circuit is connected to the switching circuit and forms a DC leakage detection circuit or an AC leakage detection circuit. In this way, when DC leakage detection is required, the DC leakage detection function can be realized through the DC leakage detection circuit, and when AC leakage detection is required, the AC leakage detection function can be realized through the AC leakage detection circuit. In addition, the DC leakage detection circuit and the AC leakage detection circuit reuse part of the circuit structure, thereby achieving high utilization rate of the overall circuit and low cost. On the other hand, the AC leakage detection results can be combined with the DC detection results to facilitate more comprehensive positioning of the leakage fault point.

[0007] In an optional embodiment, the switching circuit includes a first switch, a second switch, a third switch, and a fourth switch, wherein the first switch, the second switch, the third switch, and the fourth switch are all connected to the detection circuit.

[0008] This optional implementation manner can realize switching between the DC leakage detection circuit and the AC leakage detection circuit through the first switch, the second switch, the third switch and the fourth switch.

[0009] In an optional embodiment, the high-voltage voltage-dividing unit further includes a first voltage-dividing resistor and a second voltage-dividing resistor, the first voltage-dividing resistor is connected to the first switch, and the second voltage-dividing resistor is connected to the second switch.

[0010] This optional implementation manner can divide the output voltage of the charging pile by using the first voltage-dividing resistor and the second voltage-dividing resistor to meet the voltage restriction and achieve normal voltage sampling.

[0011] In an optional embodiment, the operational amplification unit includes a detection resistor and an amplifier, wherein the detection resistor is connected to the high-voltage voltage divider unit for detecting the voltage of the high-voltage voltage divider unit and outputting a voltage sampling signal, and the amplifier is connected to the detection resistor and to the controller for amplifying the voltage sampling signal.

[0012] This optional implementation can implement voltage sampling through a detection resistor and amplify the voltage sampling signal through an amplifier, wherein the amplified voltage sampling signal can facilitate leakage judgment and improve the accuracy of leakage judgment.

[0013] In a second aspect, the present invention provides an insulation detection method, which is applied to the insulation detection device according to any one of the aforementioned embodiments, and the insulation detection method includes: When the leakage detection instruction is triggered, the switch circuit and the detection circuit are controlled to form a DC leakage detection loop, so as to determine a DC leakage detection result based on the DC leakage detection loop; After the DC leakage detection is completed, the switch circuit and the detection circuit are controlled to form an AC leakage detection loop, so as to determine an AC leakage detection result based on the AC leakage detection loop.

[0014] The method of the second aspect of the present application can, when a leakage detection instruction is triggered, control the switch circuit and the detection circuit to form a DC leakage detection loop, thereby determining a DC leakage detection result based on the DC leakage detection loop. Furthermore, after the DC leakage detection is completed, the method can control the switch circuit and the detection circuit to form an AC leakage detection loop, thereby determining an AC leakage detection result based on the AC leakage detection loop.

[0015] In an optional embodiment, the control switch circuit and the detection circuit form a DC leakage detection loop, and determining a DC leakage detection result based on the DC leakage detection loop includes: The first switch is controlled to be closed, the second switch is controlled to be opened, the third switch is controlled to be closed, and the fourth switch is controlled to be opened to form the DC leakage detection circuit, and the positive electrode leakage detection result of the charging pile is determined based on the DC leakage detection circuit.

[0016] This optional implementation method forms the DC leakage detection circuit by controlling the first switch to be closed, the second switch to be opened, the third switch to be closed, and the fourth switch to be opened, and can determine the positive leakage detection result of the charging pile based on the DC leakage detection circuit.

[0017] In an optional embodiment, the control switch circuit and the detection circuit form a DC leakage detection loop, and determining a DC leakage detection result based on the DC leakage detection loop includes: The first switch is controlled to be open, the second switch is controlled to be closed, the third switch is controlled to be closed, and the fourth switch is controlled to be open to form the DC leakage detection circuit, and the negative electrode leakage detection result of the charging pile is determined based on the DC leakage detection circuit.

[0018] This optional implementation forms the DC leakage detection circuit by controlling the first switch to be open, the second switch to be closed, the third switch to be closed, and the fourth switch to be open, and determines the negative electrode leakage detection result of the charging pile based on the DC leakage detection circuit.

[0019] In an optional embodiment, controlling the switch circuit and the detection circuit to form an AC leakage detection loop, so as to determine an AC leakage detection result based on the AC leakage detection loop, includes: The first switch is controlled to be closed, the second switch is controlled to be opened, the third switch is controlled to be opened, and the fourth switch is controlled to be closed, so as to form the AC leakage detection loop, and the AC leakage detection result is determined based on the AC leakage detection loop.

[0020] This optional implementation can form the AC leakage detection circuit by controlling the first switch to be closed, the second switch to be opened, the third switch to be opened, and the fourth switch to be closed, and then the AC leakage detection result can be determined based on the AC leakage detection circuit.

[0021] In an optional embodiment, the insulation detection method further includes: Whether there is leakage is determined based on the DC leakage detection result and the AC leakage detection result. If there is leakage, a fault instruction is generated, and the fault instruction is used to control the charging pile to stop charging.

[0022] This optional implementation can determine whether there is leakage based on the DC leakage detection result and the AC leakage detection result. If there is leakage, a fault instruction is generated, and the charging pile is controlled to stop charging based on the fault instruction.

[0023] In a third aspect, the present invention provides a charging pile, comprising the insulation detection device as described in any one of the aforementioned embodiments.

[0024] The charging pile of the third aspect of the present application includes an insulation detection device, thereby being capable of realizing DC leakage detection and AC leakage detection, and having the advantages of low cost, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 This is a schematic diagram of the circuit structure of an insulation detection device disclosed in an embodiment of the present application; Figure 2 This is a flow chart of an insulation detection method disclosed in an embodiment of the present application; Figure 3 This is a schematic diagram of the circuit structure of another insulation detection device disclosed in an embodiment of the present application; Figure 4 This is a flow chart of another insulation detection method disclosed in an embodiment of the present application. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0028] At present, among the many technical links of charging piles, high-voltage insulation protection is crucial. Because the human body will have zero-distance contact with the charging pile, insulation detection cannot be ignored, otherwise it may cause great harm to the human body.

[0029] When testing a DC charging pile, the traditional design only performs insulation testing on the DC output part of the charging pile, and cannot perform insulation testing on the AC part of the charging pile.

[0030] In response to the technical problems existing in the prior art, the embodiments of the present application provide an insulation detection device, method, and charging pile. When DC leakage detection is required, the device can implement the DC leakage detection function through a DC leakage detection circuit, and when AC leakage detection is required, the device can implement the AC leakage detection function through an AC leakage detection circuit. Furthermore, the DC leakage detection circuit and the AC leakage detection circuit reuse some circuit structures, resulting in high overall circuit utilization and low cost. Furthermore, the AC leakage detection results can be combined with the DC detection results to facilitate more comprehensive location of the leakage fault point.

[0031] See also Figure 1 , Figure 1 This is a schematic diagram of the circuit structure of an insulation detection device disclosed in an embodiment of the present application. Figure 1 As shown, the circuit structure of the insulation detection device disclosed in the embodiment of the present application includes: A high-voltage voltage divider unit, an operational amplifier unit and a controller, wherein the operational amplifier unit is connected to the high-voltage voltage divider unit and the controller; The high-voltage voltage dividing unit includes a detection circuit and a switch circuit, wherein the detection circuit is connected to the switch circuit to form a DC leakage detection loop or an AC leakage detection loop.

[0032] The insulation detection device of the embodiment of the present application includes a high-voltage voltage divider unit, an operational amplifier unit and a controller, and the operational amplifier unit is connected to the high-voltage voltage divider unit and the controller; the high-voltage voltage divider unit includes a detection circuit and a switching circuit, wherein the detection circuit is connected to the switching circuit and forms a DC leakage detection circuit or an AC leakage detection circuit. In this way, when DC leakage detection is required, the DC leakage detection function can be realized through the DC leakage detection circuit, and when AC leakage detection is required, the AC leakage detection function can be realized through the AC leakage detection circuit. In addition, the DC leakage detection circuit and the AC leakage detection circuit reuse part of the circuit structure, thereby achieving high utilization rate of the overall circuit and low cost. On the other hand, the AC leakage detection results can be combined with the DC detection results to facilitate more comprehensive positioning of the leakage fault point.

[0033] In the embodiment of the present application, since the DC charging end of the charging pile operates at high voltage, before using the operational amplifier unit for voltage sampling, the high voltage needs to be divided first, thereby reducing the voltage at the sampling end so that the voltage at the sampling end is within a reasonable range.

[0034] In the embodiment of the present application, the connection between the operational amplifier unit and the high-voltage voltage divider unit means that the operational amplifier unit and the high-voltage voltage divider unit are connected through a circuit, and the connection between the operational amplifier unit and the controller can be achieved through the pin connection of the controller.

[0035] In an embodiment of the present application, the controller may refer to a microprocessor, wherein the microprocessor is pre-loaded with a target program, and the target program may process the voltage signal output by the operational amplifier unit according to a preset processing flow, thereby determining whether there is a leakage.

[0036] In an embodiment of the present application, the detection circuit may include a circuit composed of a DC positive port of the charging pile, a DC negative port of the charging pile, a DC leakage detection grounding point, and an AC leakage detection grounding point. The circuit composed of the DC positive port of the charging pile, the DC negative port of the charging pile, the DC leakage detection grounding point, and the AC leakage detection grounding point can form multiple circuits through the action of the switching unit, for example, a DC leakage detection circuit or an AC leakage detection circuit can be formed.

[0037] In an embodiment of the present application, as an optional implementation, the switch circuit includes a first switch, a second switch, a third switch and a fourth switch, wherein the first switch, the second switch, the third switch and the fourth switch are all connected to the detection circuit.

[0038] This optional implementation manner can realize switching between the DC leakage detection circuit and the AC leakage detection circuit through the first switch, the second switch, the third switch and the fourth switch.

[0039] In this optional embodiment, the first switch, the second switch, the third switch and the fourth switch may all be relays, or other devices that can implement an on-off controller, for example, transistors, etc.

[0040] In the embodiment of the present application, as an optional implementation, the high-voltage voltage divider unit further includes a first voltage divider resistor and a second voltage divider resistor, the first voltage divider resistor is connected to the first switch, and the second voltage divider resistor is connected to the second switch.

[0041] This optional implementation manner can divide the output voltage of the charging pile by using the first voltage-dividing resistor and the second voltage-dividing resistor to meet the voltage restriction and achieve normal voltage sampling.

[0042] In this optional implementation, the voltage dividing performance of the first voltage dividing resistor and the second voltage dividing resistor can be set based on the operating voltage of the charging pile and the sampling voltage of the operational amplifier.

[0043] In an optional embodiment, the operational amplification unit includes a detection resistor and an amplifier, wherein the detection resistor is connected to the high-voltage voltage divider unit for detecting the voltage of the high-voltage voltage divider unit and outputting a voltage sampling signal, and the amplifier is connected to the detection resistor and to the controller for amplifying the voltage sampling signal.

[0044] This optional implementation can implement voltage sampling through a detection resistor and amplify the voltage sampling signal through an amplifier, wherein the amplified voltage sampling signal can facilitate leakage judgment and improve the accuracy of leakage judgment.

[0045] In this optional implementation, since the voltage sampling signal is too small to be compared with the preset threshold, and thus leakage cannot be determined, the voltage sampling signal needs to be amplified.

[0046] See also Figure 2 , Figure 2 1 is a flow chart of an insulation detection method provided in an embodiment of the present application, wherein the insulation detection method is applied to an insulation detection device as in any one of the aforementioned embodiments. Figure 2 As shown, the insulation detection method includes the following steps: 101. When a leakage detection instruction is triggered, the switch circuit and the detection circuit are controlled to form a DC leakage detection loop, so as to determine a DC leakage detection result based on the DC leakage detection loop; 102. After the DC leakage detection is completed, the switch circuit and the detection circuit are controlled to form an AC leakage detection loop, so as to determine the AC leakage detection result based on the AC leakage detection loop.

[0047] The method of the embodiment of the present application can control the switch circuit and the detection circuit to form a DC leakage detection loop when a leakage detection instruction is triggered, thereby determining a DC leakage detection result based on the DC leakage detection loop. Furthermore, after the DC leakage detection is completed, the switch circuit and the detection circuit can be controlled to form an AC leakage detection loop, thereby determining an AC leakage detection result based on the AC leakage detection loop.

[0048] In this optional embodiment, the insulation detection method may be executed by a controller, for example, by a microprocessor.

[0049] In this optional embodiment, step 101 may be performed first to complete the DC leakage detection, and then step 102 may be performed to complete the AC leakage detection. Alternatively, step 102 may be performed first to complete the AC leakage detection, and then step 101 may be performed to complete the DC leakage detection.

[0050] In this optional embodiment, the status of the charging gun of the charging pile can be detected. If the status of the charging gun indicates that the charging gun has just been connected to the vehicle, a leakage detection instruction is triggered. It should be noted that the leakage detection instruction can be triggered in other different ways, for example, by an on-board terminal or test equipment.

[0051] In this optional implementation manner, determining the AC leakage detection result based on the AC leakage detection circuit refers to determining the AC leakage detection result based on the adopted voltage of the AC leakage detection circuit.

[0052] In this optional implementation manner, determining the DC leakage detection result based on the DC leakage detection circuit refers to determining the DC leakage detection result based on the adopted voltage of the DC leakage detection circuit.

[0053] In an embodiment of the present application, as an optional implementation, controlling the switch circuit and the detection circuit to form a DC leakage detection loop, and determining a DC leakage detection result based on the DC leakage detection loop, includes the following sub-steps: The first switch is controlled to be closed, the second switch is controlled to be opened, the third switch is controlled to be closed, and the fourth switch is controlled to be opened to form a DC leakage detection loop, and a positive electrode leakage detection result of the charging pile is determined based on the DC leakage detection loop.

[0054] This optional implementation method forms a DC leakage detection circuit by controlling the first switch to be closed, the second switch to be opened, the third switch to be closed, and the fourth switch to be opened, and can determine the positive leakage detection result of the charging pile based on the DC leakage detection circuit.

[0055] In this optional implementation manner, the positive electrode leakage detection result of the charging pile indicates whether there is leakage on the DC positive electrode leakage side of the charging pile.

[0056] In an embodiment of the present application, as an optional implementation, controlling the switch circuit and the detection circuit to form a DC leakage detection loop, and determining a DC leakage detection result based on the DC leakage detection loop, includes: The first switch is controlled to be open, the second switch is controlled to be closed, the third switch is controlled to be closed, and the fourth switch is controlled to be open to form a DC leakage detection loop, and a negative electrode leakage detection result of the charging pile is determined based on the DC leakage detection loop.

[0057] This optional implementation forms a DC leakage detection circuit by controlling the first switch to be open, the second switch to be closed, the third switch to be closed, and the fourth switch to be open, and determines the negative electrode leakage detection result of the charging pile based on the DC leakage detection circuit.

[0058] In this optional embodiment, the negative electrode leakage detection result of the charging pile is used to indicate whether there is leakage on the DC negative electrode side of the charging pile.

[0059] In an embodiment of the present application, as an optional implementation, controlling the switch circuit and the detection circuit to form an AC leakage detection loop, and determining an AC leakage detection result based on the AC leakage detection loop, includes the following steps: The first switch is controlled to be closed, the second switch is controlled to be opened, the third switch is controlled to be opened, and the fourth switch is controlled to be closed to form an AC leakage detection loop, and an AC leakage detection result is determined based on the AC leakage detection loop.

[0060] This optional implementation can form an AC leakage detection loop by controlling the first switch to be closed, the second switch to be opened, the third switch to be opened, and the fourth switch to be closed, and then the AC leakage detection result can be determined based on the AC leakage detection loop.

[0061] In this optional implementation, the AC leakage detection result is used to indicate whether leakage occurs in the AC part of the charging pile.

[0062] In the embodiment of the present application, as an optional implementation manner, the insulation detection method of the embodiment of the present application further includes the following steps: Based on the DC leakage detection results and the AC leakage detection results, it is determined whether there is leakage. If there is leakage, a fault instruction is generated. The fault instruction is used to control the charging pile to stop charging.

[0063] This optional implementation can determine whether there is leakage based on the DC leakage detection results and the AC leakage detection results. If there is leakage, a fault instruction is generated, and the charging pile is controlled to stop charging based on the fault instruction.

[0064] In this optional embodiment, the fault instruction can be executed by a controller, wherein the controller can refer to a processor installed inside the charging pile, for example, can refer to a microprocessor installed inside the charging pile.

[0065] In this optional embodiment, if there is a leakage, the controller can also control the screen of the charging pile to display an alarm message through the screen of the charging pile.

[0066] In addition, an embodiment of the present application further provides a charging pile, which includes an insulation detection device as described in any of the aforementioned embodiments.

[0067] The charging pile of the embodiment of the present application includes an insulation detection device, thereby being able to detect DC leakage and AC leakage, and having the advantages of low cost.

[0068] In the embodiments of this application, as an example, the insulation detection consists of two parts: a high-voltage divider unit and an operational amplifier unit. The high-voltage divider unit consists of a detection circuit, a divider resistor, and a relay. This unit divides the voltage passing through the circuit, providing a basis for subsequent sampling. Further, see Figure 3 , Figure 3 This is a circuit diagram of another insulation detection device disclosed in the embodiment of this application. Figure 3 As shown, the detection circuit is divided into the following three paths: The first circuit: DC+ corresponds to DC_PE. This part connects DC+ and DC_PE through a relay to detect whether DC+ has leakage.

[0069] The second path: DC- corresponds to DC_PE. This part detects whether the DC- has leakage.

[0070] The third circuit: DC+ corresponds to AC_PE. This part connects DC+ and AC_PE through a relay to detect whether there is leakage in the AC part.

[0071] Furthermore, the operational amplifier unit, consisting of a detection resistor and an amplifier, samples and amplifies the voltage of the preceding circuit, then transmits it to the MCU to determine if there is a leakage. If the detected voltage exceeds a threshold, a leakage is detected, and the MCU issues a fault command, immediately stopping charging and providing a visual alarm to the user via the charging station's screen, Bluetooth communication, or 4G / 5G.

[0072] Furthermore, the three parts of the detection are all performed on the same chip at different time periods, the circuit is simple, the circuit utilization rate is high, and the cost increase is low.

[0073] In addition, for insulation testing methods, see as an example Figure 4 , Figure 4 This is a flow chart of another insulation detection method disclosed in the embodiment of this application. Figure 4 As shown, the method comprises: Before testing, relays T1 and T3 are closed, connecting DC+ to DC_PE, and the other relays are disconnected. After the charging pile receives the charging signal, the insulation test is immediately performed.

[0074] Furthermore, perform insulation testing on DC+.

[0075] Furthermore, the voltage divider resistor divides the DC+ voltage.

[0076] Furthermore, the operational amplifier amplifies the voltage across the detection resistor and transmits it to the MCU.

[0077] The MCU then monitors the voltage for 100ms to prevent transient voltage fluctuations and determines whether it exceeds a threshold. If the voltage exceeds 100V, a leakage is detected. The MCU issues a fault command, immediately halting charging and providing a visual alert to the user via the charging station's screen, Bluetooth communication, and 4G / 5G. If the voltage does not exceed the threshold, the insulation is deemed good, relay T1 is disconnected, and the next test proceeds.

[0078] Furthermore, after the dead time, relay T2 is turned on, connecting DC- to DC_PE, and the other relays are in the disconnected state. An insulation test is performed on DC-.

[0079] Furthermore, the piezoresistor divides the DC- voltage.

[0080] Furthermore, the operational amplifier amplifies the voltage across the detection resistor and transmits it to the MCU.

[0081] The MCU then monitors the voltage for 100ms to prevent transient voltage fluctuations and determines whether it exceeds a threshold. If the voltage exceeds 100V, a leakage is detected and the MCU issues a fault command, immediately stopping charging and providing a visual alert to the user via the charging station's screen, Bluetooth communication, and 4G / 5G. If the voltage does not exceed the threshold, the insulation is deemed to be good, and relays T2 and T3 are disconnected for further testing.

[0082] Furthermore, after the dead time, relays T1 and T4 are turned on to connect DC+ to AC_PE, while the other relays are disconnected. This performs an insulation test on the AC part.

[0083] Furthermore, the voltage divider resistor divides the DC+ voltage.

[0084] Furthermore, the operational amplifier amplifies the voltage across the detection resistor and transmits it to the MCU.

[0085] The MCU then monitors the voltage for 100ms to prevent transient voltage fluctuations and determines whether it exceeds a threshold. If the voltage exceeds 100V, a leakage is detected and the MCU issues a fault command, immediately stopping charging. A visual alarm is provided to the user via the charging station's display, Bluetooth communication, and 4G / 5G. If the voltage does not exceed the threshold, insulation is determined to be good, relays T1 and T4 are disconnected, and the test is complete, allowing charging to resume.

[0086] It should be noted that Figure 4 In the figure, R1 represents the first voltage-dividing resistor, R2 represents the second voltage-dividing resistor, T1 represents the first switch, T2 represents the second switch, T3 represents the third switch, T4 represents the fourth switch, and RSENSE represents the sense resistor. Meanwhile, DC+ represents the DC positive terminal, DC- represents the DC negative terminal of the charging station, DC_PE represents the DC leakage detection grounding point, and AC_PE represents the AC leakage detection grounding point.

[0087] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interface, the indirect coupling or communication connection of the device or unit can be electrical, mechanical or other forms.

[0088] In addition, the units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0089] Furthermore, the functional modules in each embodiment of the present application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0090] It should be noted that if the function is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the existing technology, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, and other media that can store program code.

[0091] In this document, relational terms such as first and second, etc. are used merely to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any actual relationship or order between these entities or operations.

[0092] The above are merely examples of the present application and are not intended to limit the scope of protection of the present application. Those skilled in the art will appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. An insulation detection device, characterized in that: The insulation detection device includes: a high-voltage voltage divider unit, an operational amplifier unit and a controller, wherein the operational amplifier unit is connected to the high-voltage voltage divider unit and the controller; The high-voltage voltage divider unit includes a detection circuit and a switch circuit, wherein the detection circuit is connected to the switch circuit to form a DC leakage detection loop or an AC leakage detection loop.

2. The insulation detection device according to claim 1, characterized in that: The switch circuit includes a first switch, a second switch, a third switch, and a fourth switch, wherein the first switch, the second switch, the third switch, and the fourth switch are all connected to the detection circuit.

3. The insulation detection device according to claim 2, characterized in that: The high-voltage voltage-dividing unit further includes a first voltage-dividing resistor and a second voltage-dividing resistor, wherein the first voltage-dividing resistor is connected to the first switch, and the second voltage-dividing resistor is connected to the second switch.

4. The insulation detection device according to claim 1, characterized in that: The operational amplifier unit includes a detection resistor and an amplifier, wherein the detection resistor is connected to the high-voltage voltage divider unit for detecting the voltage of the high-voltage voltage divider unit and outputting a voltage sampling signal, and the amplifier is connected to the detection resistor and to the controller for amplifying the voltage sampling signal.

5. An insulation detection method, characterized in that: The insulation detection method is applied to the insulation detection device according to any one of claims 1 to 4, and the insulation detection method includes: When the leakage detection instruction is triggered, the switch circuit and the detection circuit are controlled to form a DC leakage detection loop, so as to determine a DC leakage detection result based on the DC leakage detection loop; After the DC leakage detection is completed, the switch circuit and the detection circuit are controlled to form an AC leakage detection loop, so as to determine an AC leakage detection result based on the AC leakage detection loop.

6. The insulation detection method according to claim 5, characterized in that: The control switch circuit and the detection circuit form a DC leakage detection loop, and determine a DC leakage detection result based on the DC leakage detection loop, including: The first switch is controlled to be closed, the second switch is controlled to be opened, the third switch is controlled to be closed, and the fourth switch is controlled to be opened to form the DC leakage detection circuit, and the positive electrode leakage detection result of the charging pile is determined based on the DC leakage detection circuit.

7. The insulation detection method according to claim 5, wherein: The control switch circuit and the detection circuit form a DC leakage detection loop, and determine a DC leakage detection result based on the DC leakage detection loop, including: The first switch is controlled to be open, the second switch is controlled to be closed, the third switch is controlled to be closed, and the fourth switch is controlled to be open to form the DC leakage detection circuit, and the negative electrode leakage detection result of the charging pile is determined based on the DC leakage detection circuit.

8. The insulation detection method according to claim 5, wherein: The controlling the switch circuit and the detection circuit to form an AC leakage detection loop, so as to determine an AC leakage detection result based on the AC leakage detection loop, includes: The first switch is controlled to be closed, the second switch is controlled to be opened, the third switch is controlled to be opened, and the fourth switch is controlled to be closed, so as to form the AC leakage detection loop, and the AC leakage detection result is determined based on the AC leakage detection loop.

9. The method according to claim 5, wherein The insulation detection method further comprises: Whether there is leakage is determined based on the DC leakage detection result and the AC leakage detection result. If there is leakage, a fault instruction is generated, and the fault instruction is used to control the charging pile to stop charging.

10. A charging pile, characterized in that: The charging pile includes the insulation detection device according to any one of claims 1 to 4.

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