Detection circuit, detection method and device

Abstract

The invention discloses a detection circuit, a detection method and a detection device, and relates to the technical field of circuit safety, the circuit comprises a to-be-detected circuit assembly, the to-be-detected circuit assembly is used for insulation detection, and the to-be-detected circuit assembly comprises an insulation resistor; the first end of the to-be-tested circuit assembly is connected with the DC power supply, and the second end of the to-be-tested circuit assembly is connected with the ground. The detection circuit assembly comprises a fling-cut switch and a fling-cut resistor, the fling-cut switch and the fling-cut resistor are connected in series, the first end of the detection circuit assembly is connected with the direct-current power supply, and the second end of the detection circuit assembly is connected with the ground; the to-be-detected circuit assembly and the detection circuit assembly are connected in parallel, and the detection circuit assembly is used for carrying out performance detection on the to-be-detected circuit assembly. According to the invention, the working performance of the to-be-detected circuit assembly used for insulation detection can be effectively detected, so that the normal execution of the insulation detection function can be ensured, and the safety of the circuit is ensured.

Description

Technical Field

[0001] The present application relates to the field of circuit safety technology, and in particular to a detection circuit, a detection method and a device. Background Art

[0002] In humid environments such as fog, rain, and snow, charging piles are prone to internal condensation and water entering the gun tip. In this case, the insulation detection function of the charging pile will fail when charging the vehicle, and normal insulation detection cannot be performed during the charging process. The failure of the insulation detection of the charging pile may cause electric shock, short circuit or fire, threatening the safety of people and vehicles.

[0003] The relevant technology mainly focuses on the design of the insulation detection function of the charging pile, but does not take into account that the insulation detection function itself may also fail abnormally. Summary of the invention

[0004] In order to effectively detect the working performance of the circuit components to be tested for insulation detection, so as to ensure the normal execution of the insulation detection function and protect the safety of the circuit, the present application provides a detection circuit, a detection method and a device. The technical solution is as follows: In a first aspect, the present application provides a detection circuit, the circuit comprising: A circuit component to be tested, the circuit component to be tested is used for insulation detection, and the circuit component to be tested includes an insulation resistor; a first end of the circuit component to be tested is connected to a DC power supply, and a second end of the circuit component to be tested is connected to a ground wire; A detection circuit component, comprising a switching switch and a switching resistor, wherein the switching switch and the switching resistor are connected in series, a first end of the detection circuit component is connected to the DC power supply, and a second end of the detection circuit component is connected to the ground line; The circuit component to be tested and the detection circuit component are connected in parallel, and the detection circuit component is used to perform performance detection on the circuit component to be tested.

[0005] In one embodiment of the present application, the detection circuit component includes: A first detection component includes a first switching switch among the switching switches and a first switching resistor among the switching resistors, wherein the first switching switch is connected in series with the first switching resistor; The first end of the first detection component is connected to the positive electrode of the DC power supply, and the second end of the first detection component is connected to the ground wire.

[0006] In one embodiment of the present application, the circuit component to be tested includes: A first component to be tested includes a first sampling resistor; A second component under test includes a first bias switch and a first bias resistor; the first bias switch and the first bias resistor are connected in series; A third component to be tested includes a first insulation resistor among the insulation resistors; The first component under test, the second component under test, the third component under test and the first detection component are connected in parallel.

[0007] In one embodiment of the present application, the detection circuit component includes: A second detection component includes a second switching switch in the switching switch and a second switching resistor in the switching resistor, wherein the second switching switch is connected in series with the second switching resistor; The first end of the second detection component is connected to the negative electrode of the DC power supply, and the second end of the second detection component is connected to the ground wire.

[0008] In one embodiment of the present application, the circuit component to be tested includes: The fourth component under test includes a second sampling resistor; a fifth component under test, comprising a second bias switch and a second bias resistor, wherein the second bias switch and the second bias resistor are connected in series; a sixth component under test, comprising a second insulation resistor among the insulation resistors; The fourth component under test, the fifth component under test, the sixth component under test and the second detection component are connected in parallel.

[0009] In a second aspect, the present application provides a detection method, the method comprising: When the switching switch of the detection circuit component is closed, an insulation detection process is performed based on the switching resistance of the circuit component to be tested and the detection circuit component to determine a first resistance value of the insulation resistance in the circuit component to be tested; the first resistance value represents the insulation condition of the DC power supply to the ground wire when the detection circuit component is connected; When the switching switch of the detection circuit assembly is disconnected, an insulation detection process is performed based on the circuit assembly to be tested to determine a second resistance value of the insulation resistance in the circuit assembly to be tested; the second resistance value represents the insulation condition of the DC power supply to the ground wire when the detection circuit assembly is not connected; Based on the first resistance value of the insulation resistance and the second resistance value of the insulation resistance, a performance detection result of the circuit component under test is determined, and the performance detection result indicates whether the insulation detection function of the circuit component under test is normal and the detection accuracy of the circuit component under test.

[0010] In one embodiment of the present application, determining the performance test result of the circuit component to be tested based on the first resistance value of the insulation resistance and the second resistance value of the insulation resistance includes: Acquire a first reference threshold condition and a second reference threshold condition; the first reference threshold condition indicates the insulation requirement of the DC power supply to the ground wire when the detection circuit component is connected, and the second reference threshold condition indicates the insulation requirement of the DC power supply to the ground wire when the detection circuit component is not connected; When the first resistance value satisfies the first reference threshold condition and the second resistance value satisfies the second reference threshold condition, a performance detection result of the circuit component under test is determined, and the performance detection result indicates that the insulation detection function of the circuit component under test is normal.

[0011] In one embodiment of the present application, the insulation resistor includes a first insulation resistor and a second insulation resistor, the first end of the first insulation resistor is connected to the positive electrode of the DC power supply, the second end of the first insulation resistor is connected to the ground wire, the first end of the second insulation resistor is connected to the negative electrode of the DC power supply, and the second end of the second insulation resistor is connected to the ground wire; the detection circuit component includes a first detection component and a second detection component, the first end of the first detection component is connected to the positive electrode of the DC power supply, the second end of the first detection component is connected to the ground wire, the first end of the second detection component is connected to the negative electrode of the DC power supply, and the second end of the second detection component is connected to the ground wire, the first detection component includes a first switching switch and a first switching resistor connected in series, and the second detection component includes a second switching switch and a second switching resistor connected in series; The method of performing insulation detection based on the switching resistance of the circuit component to be tested and the detection circuit component when the switching switch of the detection circuit component is closed, and determining a first resistance value of the insulation resistance in the circuit component to be tested, comprises: When the first switching switch and the second switching switch are both closed, insulation detection processing is performed based on the circuit component to be tested, the first switching resistor and the second switching resistor to determine a first resistance value of the first insulation resistor and a first resistance value of the second insulation resistor, the first resistance value of the first insulation resistor indicates the insulation condition of the positive electrode of the DC power supply to the ground wire when the first detection component and the second detection component are connected, and the first resistance value of the second insulation resistor indicates the insulation condition of the negative electrode of the DC power supply to the ground wire when the first detection component and the second detection component are connected.

[0012] In one embodiment of the present application, the insulation resistor includes a first insulation resistor and a second insulation resistor, the first end of the first insulation resistor is connected to the positive electrode of the DC power supply, the second end of the first insulation resistor is connected to the ground wire, the first end of the second insulation resistor is connected to the negative electrode of the DC power supply, and the second end of the second insulation resistor is connected to the ground wire; the detection circuit component includes a first detection component and a second detection component, the first end of the first detection component is connected to the positive electrode of the DC power supply, the second end of the first detection component is connected to the ground wire, the first end of the second detection component is connected to the negative electrode of the DC power supply, and the second end of the second detection component is connected to the ground wire, the first detection component includes a first switching switch and a first switching resistor connected in series, and the second detection component includes a second switching switch and a second switching resistor connected in series; When the switching switch of the detection circuit component is disconnected, performing insulation detection processing based on the circuit component to be tested to determine a second resistance value of the insulation resistance in the circuit component to be tested includes: When the first switching switch and the second switching switch are both disconnected, insulation detection processing is performed based on the circuit component to be tested to determine the second resistance value of the first insulation resistor and the second resistance value of the second insulation resistor, the second resistance value of the first insulation resistor indicates the insulation condition of the positive electrode of the DC power supply to the ground wire when the first detection component and the second detection component are not connected, and the second resistance value of the second insulation resistor indicates the insulation condition of the negative electrode of the DC power supply to the ground wire when the first detection component and the second detection component are not connected.

[0013] In one embodiment of the present application, the method further includes: When the first switching switch is closed and the second switching switch is open, insulation detection processing is performed based on the circuit component to be tested and the first switching resistor to determine the third resistance value of the first insulation resistor, and the third resistance value of the first insulation resistor indicates the insulation condition of the positive electrode of the DC power supply to the ground wire when only the first detection component is connected.

[0014] In one embodiment of the present application, the method further includes: When the first switching switch is open and the second switching switch is closed, insulation detection processing is performed based on the circuit component to be tested and the second switching resistor to determine a third resistance value of the second insulation resistor, and the third resistance value of the second insulation resistor indicates the insulation condition of the negative electrode of the DC power supply to the ground wire when only the second detection component is connected.

[0015] In a third aspect, the present application provides a detection device, the device comprising: A first insulation detection module is used to perform insulation detection processing based on the switching resistance of the circuit component to be tested and the detection circuit component when the switching switch of the detection circuit component is closed, and determine a first resistance value of the insulation resistance in the circuit component to be tested; the first resistance value represents the insulation condition of the DC power supply to the ground line when the detection circuit component is connected; A second insulation detection module is used to perform insulation detection processing based on the circuit component to be tested when the switching switch of the detection circuit component is disconnected, and determine a second resistance value of the insulation resistance in the circuit component to be tested; the second resistance value represents the insulation condition of the DC power supply to the ground wire when the detection circuit component is not connected; A performance detection module is used to determine a performance detection result of the circuit component to be tested based on the first resistance value of the insulation resistance and the second resistance value of the insulation resistance, wherein the performance detection result indicates whether the insulation detection function of the circuit component to be tested is normal and the detection accuracy of the circuit component to be tested.

[0016] In a fourth aspect, the present application provides a charging pile, wherein the charging pile is configured with the detection circuit as described in the first aspect.

[0017] The detection circuit, detection method and device provided in this application have the following technical effects: The detection circuit provided by the solution provided in the present application includes a circuit component to be tested and a detection circuit component, the circuit component to be tested is used for insulation detection, and the circuit component to be tested includes an insulation resistor; the first end of the circuit component to be tested is connected to a DC power supply, and the second end of the circuit component to be tested is connected to a ground wire; the detection circuit component includes a switching switch and a switching resistor, the switching switch and the switching resistor are connected in series, the first end of the detection circuit component is connected to the DC power supply, and the second end of the detection circuit component is connected to the ground wire; the circuit component to be tested and the detection circuit component are connected in parallel, and the detection circuit component is used to perform performance detection on the circuit component to be tested. When the switching switch of the detection circuit component is closed, insulation detection processing is performed based on the switching resistance of the circuit component to be tested and the detection circuit component to determine the first resistance value of the insulation resistance in the circuit component to be tested; the first resistance value represents the insulation condition of the DC power supply to the ground wire when the detection circuit component is connected; when the switching switch of the detection circuit component is disconnected, insulation detection processing is performed based on the circuit component to be tested to determine the second resistance value of the insulation resistance in the circuit component to be tested; the second resistance value represents the insulation condition of the DC power supply to the ground wire when the detection circuit component is not connected; based on the first resistance value of the insulation resistance and the second resistance value of the insulation resistance, the performance detection result of the circuit component to be tested is determined, and the performance detection result indicates whether the insulation detection function of the circuit component to be tested is normal and the detection accuracy of the circuit component to be tested. By using the technical solution provided by the present application, the working performance of the circuit component to be tested for insulation detection can be effectively detected to ensure the normal execution of the insulation detection function and the safety of the circuit.

[0018] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 is a schematic diagram of a detection circuit provided in an embodiment of the present application; Figure 2 is a schematic diagram of another detection circuit provided in an embodiment of the present application; Figure 3 is a schematic diagram of another detection circuit provided in an embodiment of the present application; Figure 4 It is a flow chart of a detection method provided in an embodiment of the present application; Figure 5 It is a flow chart of another detection method provided in an embodiment of the present application; Figure 6 It is a flow chart of another detection method provided in an embodiment of the present application; Figure 7 It is a schematic diagram of a detection device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of this application. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions.

[0022] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or server that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0023] Figure 1 This is a schematic diagram of a detection circuit provided in an embodiment of the present application. The present application provides a circuit structure as shown in the embodiment or schematic diagram, but based on conventional or non-creative labor, it may include more or fewer circuit components. The circuit structure listed in the embodiment does not represent the only limitation on the detection circuit provided in the present application. Please refer to Figure 1 , a detection circuit provided by an embodiment of the present application may include a circuit component to be tested and a detection circuit component, wherein: The circuit component to be tested is used for insulation detection, and the circuit component to be tested includes an insulation resistor; a first end of the circuit component to be tested is connected to a DC power supply, and a second end of the circuit component to be tested is connected to a ground wire.

[0024] In the embodiment of the present application, the circuit component to be tested is used for insulation detection, and the resistance value of the insulation resistor included in the circuit component to be tested can indicate the insulation condition of the DC power supply to the ground line. In the embodiment of the present application, the above-mentioned resistance component to be tested can indicate the components included and the connection relationship between the components, that is, the resistance component to be tested can be equivalent to the insulation detection circuit.

[0025] In the embodiments of the present application, Figure 1 As shown, the DC power supply has a positive electrode and a negative electrode, and the ground wire is connected between the positive electrode and the negative electrode of the DC power supply. The first end of the circuit component to be tested connected to the DC power supply may include a first sub-end of the circuit component to be tested connected to the DC positive bus of the DC power supply and a second sub-end of the circuit component to be tested connected to the DC negative bus of the DC power supply. The second end of the circuit component to be tested is connected to the ground wire, which may be one end of a component in the circuit component to be tested connected to the ground wire, or one end of each of multiple components in the circuit component to be tested is connected to the ground wire. The specific connection end points may depend on the structure of the circuit component to be tested designed to realize the insulation detection function.

[0026] In the embodiments of the present application, Figure 1 As shown, the insulation resistance may include at least one R 绝缘 , R 绝缘 It can be arranged on one of the at least one branch formed by the circuit component to be tested, R 绝缘 One end can also be connected to the ground wire.

[0027] In the present embodiment, R 绝缘 The connection relationship in the circuit component to be tested may be determined according to the specific structure of the circuit component to be tested. The circuit component to be tested may also include other types of resistance components or switch components.

[0028] In the embodiments of the present application, Figure 1 As shown, the ground wire (PE) described in the embodiment of the present application can be the casing of the charging pile or the earth, etc.

[0029] The detection circuit component includes a switching switch and a switching resistor, which are connected in series. The first end of the detection circuit component is connected to a DC power supply, and the second end of the detection circuit component is connected to a ground wire.

[0030] In an embodiment of the present application, the detection circuit component is used to detect the performance status of the circuit component to be tested, including detecting whether the insulation detection function of the circuit component to be tested is abnormal, and detecting the detection accuracy of the insulation detection function that can be achieved by the circuit component to be tested. The DC power supply has a positive pole and a negative pole, and the ground wire is connected between the positive pole and the negative pole of the DC power supply. The first end of the detection circuit component connected to the DC power supply may include a first sub-end of the detection circuit component connected to the DC positive bus of the DC power supply and a second sub-end of the detection circuit component connected to the DC negative bus of the DC power supply. The second end of the circuit component to be tested is connected to the ground wire, which may be one end of a component in the detection circuit component connected to the ground wire, or one end of each of multiple components in the circuit component to be tested is connected to the ground wire.

[0031] In the embodiment of the present application, the switching switch in the detection circuit component is used to control whether the detection circuit component is connected to the circuit formed by the circuit component to be tested, the DC power supply and the ground wire.

[0032] like Figure 1 As shown, the switching switch may include at least one switch S 投切 The switching resistor may include at least one resistor R 投切 , S 投切 With R 投切 connected in series and arranged on one of the at least one branch formed by the detection circuit assembly, wherein R 投切 One end of S can be connected to the ground wire. 投切 It can be a power electronic switch device such as MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) or IGBT (Insulate-Gate Bipolar Transistor). The detection circuit component can also include other types of resistance components or switch components.

[0033] The first end of the circuit component to be tested is connected to a DC power supply, the second end of the circuit component to be tested is connected to a ground wire, the first end of the detection circuit component is connected to a DC power supply, and the second end of the detection circuit component is connected to the ground wire, so the circuit component to be tested and the detection circuit component are connected in parallel.

[0034] The embodiments of the present application comprehensively analyze the performance of the circuit component to be tested by detecting the performance of the circuit component to be tested when the detection circuit component is connected and the performance of the circuit component to be tested when the detection circuit component is not connected, so as to prevent problems before they occur, ensure the normal execution of the insulation detection function, and protect the safety of the circuit.

[0035] Figure 2This is a schematic diagram of another detection circuit provided in the embodiment of the present application. The present application provides a circuit structure as shown in the embodiment or schematic diagram, but based on conventional or non-creative labor, it may include more or fewer circuit components. The circuit structure listed in the embodiment does not represent the only limitation on the detection circuit provided in the present application. Please refer to Figure 2 , a detection circuit provided in an embodiment of the present application may include a circuit component to be tested and a detection circuit component, wherein: The circuit component to be tested is used for insulation detection, and the circuit component to be tested includes an insulation resistor; a first end of the circuit component to be tested is connected to a DC power supply, and a second end of the circuit component to be tested is connected to a ground wire.

[0036] In the embodiments of the present application, Figure 2 As shown, the circuit components to be tested include insulation resistors and other components not shown. The insulation resistor includes a first insulation resistor R p and the second insulation resistance R n , the first insulation resistance R p The first end is connected to the positive electrode of the DC power supply, and the first insulation resistor R p The second end of the second insulation resistor R n The first end is connected to the negative electrode of the DC power supply, and the second insulation resistor R n The second end of the first insulation resistor R is connected to the ground wire. p and the second insulation resistance R n That is, they are connected in series. The first insulation resistance R p Used to detect the insulation condition of the positive pole of the DC power supply to the ground wire, the second insulation resistance R n Used to detect the insulation condition of the negative pole of the DC power supply to the ground wire.

[0037] The detection circuit component comprises a switching switch and a switching resistor, the switching switch and the switching resistor are connected in series, a first end of the detection circuit component is connected to a DC power supply, and a second end of the detection circuit component is connected to a ground wire.

[0038] In an embodiment of the present application, the detection circuit component includes: The first detection component includes a first switching switch in the switching switch and a first switching resistor in the switching resistor, the first switching switch and the first switching resistor are connected in series; the first end of the first detection component is connected to the positive electrode of the DC power supply, and the second end of the first detection component is connected to the ground wire.

[0039] like Figure 2 As shown, the first detection component includes a first switching switch S1 and a first switching resistor R3, the first end of the first switching switch S1 is connected to the positive electrode of the DC power supply, the second end is connected to the first end of the first switching resistor R3, and the second end of the first switching resistor R3 is connected to the ground line.

[0040] In an embodiment of the present application, the first insulation resistor in the circuit component to be tested and the first detection component in the detection circuit component are connected in parallel. The first detection component is used to detect the performance of the first insulation resistor, and can also perform effectiveness detection on the insulation detection function implemented by the first branch formed by the circuit component to be tested, wherein the first branch is the branch between the positive pole of the DC power supply where the first insulation resistor is located and the ground wire.

[0041] In an embodiment of the present application, the detection circuit component includes: The second detection component includes a second switching switch in the switching switch and a second switching resistor in the switching resistor, and the second switching switch and the second switching resistor are connected in series; the first end of the second detection component is connected to the negative electrode of the DC power supply, and the second end of the second detection component is connected to the ground wire.

[0042] like Figure 2 As shown, the second detection component includes a second switching switch S2 and a second switching resistor R4, the first end of the second switching switch S2 is connected to the negative electrode of the DC power supply, the second end is connected to the first end of the second switching resistor R4, and the second end of the second switching resistor R4 is connected to the ground line.

[0043] In an embodiment of the present application, the second insulation resistor in the circuit component to be tested and the second detection component in the detection circuit component are connected in parallel. The second detection component is used to detect the performance of the second insulation resistor, and can also perform effectiveness detection on the insulation detection function implemented by the second branch formed by the circuit component to be tested, wherein the second branch is the branch between the negative pole of the DC power supply where the second insulation resistor is located and the ground wire.

[0044] In one embodiment of the present application, the detection circuit may also include only the first detection component or only the second detection component, so as to realize separate performance detection of the first branch or the second branch.

[0045] The embodiments of this application provide Figure 2 The detection circuit shown can respectively detect the effectiveness of the insulation detection function between the positive electrode of the DC power supply and the ground wire implemented by the first branch and the insulation detection function between the negative electrode of the DC power supply and the ground wire implemented by the second branch, by controlling the first switching switch S1 to be opened or closed, and connecting or disconnecting the first switching resistor R3 to the circuit formed by the above-mentioned circuit component to be tested, the DC power supply and the ground wire, and by controlling the second switching switch S2 to be opened or closed, and connecting or disconnecting the second switching resistor R4 to the circuit formed by the above-mentioned circuit component to be tested, the DC power supply and the ground wire, to ensure that the insulation detection function between the positive electrode of the DC power supply and the ground wire and the insulation detection function between the negative electrode of the DC power supply and the ground wire can be implemented normally.

[0046] Figure 3 This is a schematic diagram of another detection circuit provided in the embodiment of the present application. The present application provides a circuit structure as shown in the embodiment or schematic diagram, but based on conventional or non-creative labor, it may include more or fewer circuit components. The circuit structure listed in the embodiment does not represent the only limitation on the detection circuit provided in the present application. Please refer to Figure 3 , a detection circuit provided in an embodiment of the present application may include a circuit component to be tested and a detection circuit component, wherein: The circuit component to be tested is used for insulation detection, and the circuit component to be tested includes an insulation resistor; a first end of the circuit component to be tested is connected to a DC power supply, and a second end of the circuit component to be tested is connected to a ground wire.

[0047] In an embodiment of the present application, the circuit component to be tested includes: A first component to be tested includes a first sampling resistor; The second component to be tested includes a first bias switch and a first bias resistor; the first bias switch and the first bias resistor are connected in series; A third component to be tested includes a first insulation resistor among the insulation resistors; The first component under test, the second component under test, and the third component under test are connected in parallel.

[0048] like Figure 3 As shown, the first component under test includes a first sampling resistor R 11 , the first sampling resistor R 11 The first end of the first sampling resistor R 11 The second component under test includes a first bias switch K p and the first bias resistor R 12 , the first bias switch K p The first end of the first bias switch K is connected to the positive electrode of the DC power supply. p The second end of the first bias resistor R 12 The first end of the first bias resistor R 12 The second end of is connected to the ground line, which is equivalent to the first bias switch K p and the first bias resistor R 12 The first bias switch K p and the first bias resistor R 12 The positions of can be exchanged, and this embodiment of the present application does not limit this. The third component to be tested includes a first insulation resistance R p , the first insulation resistance R p The first end is connected to the positive electrode of the DC power supply, and the first insulation resistor R p The second end is connected to the ground line.

[0049] In such Figure 3In the circuit shown, the first bias switch K p The insulation condition of the positive pole of the DC power supply to the ground wire is tested by closing or opening the positive pole of the DC power supply to the ground wire.

[0050] In an embodiment of the present application, the circuit component to be tested includes: The fourth component under test includes a second sampling resistor; a fifth component under test, comprising a second bias switch and a second bias resistor, wherein the second bias switch and the second bias resistor are connected in series; A sixth component under test includes a second insulation resistor in the insulation resistor; The fourth component under test, the fifth component under test, and the sixth component under test are connected in parallel.

[0051] like Figure 3 As shown, the fourth component under test includes a second sampling resistor R 21 , the second sampling resistor R 21 The first end of the second sampling resistor R 21 The second end of is connected to the ground line. The fifth component under test includes a second bias switch K n and the second bias resistor R 22 , the second bias switch K n The first end of the bias switch K is connected to the negative electrode of the DC power supply. n The second end of the second bias resistor R 22 The first end of the second bias resistor R 22 The second end of is connected to the ground line, which is equivalent to the second bias switch K n and the second bias resistor R 22 The second bias switch K n and the second bias resistor R 22 The positions of can be exchanged, and this embodiment of the present application does not limit this. The sixth component under test includes a second insulation resistance R n , the second insulation resistance R n The first end is connected to the negative electrode of the DC power supply, and the second insulation resistor R n The second end is connected to the ground line.

[0052] In such Figure 3 In the circuit shown, the second bias switch K n The insulation condition of the negative pole of the DC power supply to the ground wire is detected by closing or opening the switch.

[0053] The detection circuit component comprises a switching switch and a switching resistor, the switching switch and the switching resistor are connected in series, a first end of the detection circuit component is connected to a DC power supply, and a second end of the detection circuit component is connected to a ground wire.

[0054] In the embodiment of the present application, the detection circuit component includes a first detection component and a second detection component, wherein: The first detection component includes a first switching switch S1 and a first switching resistor R3. The first switching switch S1 has a first end connected to the positive electrode of the DC power supply, a second end connected to the first end of the first switching resistor R3, and a second end of the first switching resistor R3 connected to the ground.

[0055] The second detection component includes a second switching switch S2 and a second switching resistor R4, wherein a first end of the second switching switch S2 is connected to the negative electrode of the DC power supply, a second end is connected to a first end of the second switching resistor R4, and a second end of the second switching resistor R4 is connected to the ground line. In a specific application, the first switching resistor R3 and the second switching resistor R4 can be 50KΩ (KΩ means kilo ohms).

[0056] The first component under test, the second component under test, and the third component under test in the circuit component under test are connected in parallel with the first detection component in the detection circuit component, and the first detection component is used to detect the effectiveness of the insulation detection function implemented by the first component under test, the second component under test, and the third component under test.

[0057] The fourth component under test, the fifth component under test and the sixth component under test in the circuit component under test are connected in parallel with the second detection component in the detection circuit component, and the second detection component is used to detect the effectiveness of the insulation detection function implemented by the fourth component under test, the fifth component under test and the sixth component under test.

[0058] In such Figure 3 In the detection circuit shown, a symmetrical detection circuit is used, which can reduce measurement errors, improve detection accuracy and reliability, improve measurement precision, simplify the calculation process, and improve detection efficiency.

[0059] Figure 4 It is a flowchart of a detection method provided in an embodiment of the present application. The present application provides method operation steps as described in the embodiment or flowchart, but may include more or fewer operation steps based on conventional or non-creative labor. The order of steps listed in the embodiment is only one way of executing the steps among many orders, and does not represent the only order of execution. When the actual system or server product is executed, it can be executed in sequence or in parallel (for example, in a parallel processor or multi-threaded processing environment) according to the method shown in the embodiment or the accompanying drawings. Please refer to Figure 4 A detection method provided in an embodiment of the present application may include the following steps: S110: When the switching switch of the detection circuit assembly is closed, insulation detection processing is performed based on the switching resistance of the circuit assembly to be tested and the detection circuit assembly to determine a first resistance value of the insulation resistance in the circuit assembly to be tested.

[0060] In an embodiment of the present application, the switching switch of the detection circuit component is closed, the detection circuit component is connected to the insulation detection circuit formed by the circuit component to be tested, the DC power supply and the ground wire, and insulation detection processing is performed, so as to obtain a first resistance value of the insulation resistance that can represent the insulation condition of the DC power supply to the ground wire when the detection circuit component is connected.

[0061] In one embodiment of the present application, Figure 2 As shown, the insulation resistance includes a first insulation resistance R p and the second insulation resistance R n , the first insulation resistance R p The first end is connected to the positive electrode of the DC power supply, and the first insulation resistor R p The second end of the second insulation resistor R n The first end is connected to the negative electrode of the DC power supply, and the second insulation resistor R n The second end is connected to the ground wire; the detection circuit component includes a first detection component and a second detection component, the first end of the first detection component is connected to the positive electrode of the DC power supply, the second end of the first detection component is connected to the ground wire, the first end of the second detection component is connected to the negative electrode of the DC power supply, and the second end of the second detection component is connected to the ground wire. The first detection component includes a first switching switch S1 and a first switching resistor R3 connected in series, and the second detection component includes a second switching switch S2 and a second switching resistor R4 connected in series. Based on Figure 2 The detection circuit shown, the above S110 can be implemented as follows: S111: When the first switching switch and the second switching switch are both closed, insulation detection processing is performed based on the circuit component to be tested, the first switching resistor and the second switching resistor to determine a first resistance value of the first insulation resistor and a first resistance value of the second insulation resistor.

[0062] In an embodiment of the present application, the first resistance value of the first insulation resistor indicates the insulation condition of the positive pole of the DC power supply to the ground when the first detection component and the second detection component are connected, and the first resistance value of the second insulation resistor indicates the insulation condition of the negative pole of the DC power supply to the ground when the first detection component and the second detection component are connected.

[0063] In the embodiment of the present application, the insulation detection process is performed based on the circuit component to be tested, the first switching resistor and the second switching resistor. It can be determined according to the circuit formed by the designed circuit component to be tested and the designed detection method, and the embodiment of the present application is not limited to this.

[0064] S120: When the switching switch of the detection circuit component is disconnected, an insulation detection process is performed based on the circuit component to be tested to determine a second resistance value of the insulation resistance in the circuit component to be tested.

[0065] In an embodiment of the present application, the switching switch of the detection circuit component is disconnected, the detection circuit component is not connected to the insulation detection circuit formed by the circuit component to be tested, the DC power supply and the ground wire, and insulation detection processing is performed, so as to obtain a second resistance value of the insulation resistance that can represent the insulation condition of the DC power supply to the ground wire when the detection circuit component is not connected.

[0066] In one embodiment of the present application, Figure 2 As shown, the insulation resistance includes a first insulation resistance R p and the second insulation resistance R n , the first insulation resistance R p The first end is connected to the positive electrode of the DC power supply, and the first insulation resistor R p The second end of the second insulation resistor R n The first end is connected to the negative electrode of the DC power supply, and the second insulation resistor R n The second end is connected to the ground wire; the detection circuit component includes a first detection component and a second detection component, the first end of the first detection component is connected to the positive electrode of the DC power supply, the second end of the first detection component is connected to the ground wire, the first end of the second detection component is connected to the negative electrode of the DC power supply, and the second end of the second detection component is connected to the ground wire. The first detection component includes a first switching switch S1 and a first switching resistor R3 connected in series, and the second detection component includes a second switching switch S2 and a second switching resistor R4 connected in series. Based on Figure 2 The detection circuit shown, the above S120 can be implemented as follows: S121: When the first switching switch and the second switching switch are both disconnected, insulation detection processing is performed based on the circuit component to be tested to determine a second resistance value of the first insulation resistor and a second resistance value of the second insulation resistor.

[0067] In an embodiment of the present application, the second resistance value of the first insulation resistor indicates the insulation condition of the positive pole of the DC power supply to the ground wire when the first detection component and the second detection component are not connected, and the second resistance value of the second insulation resistor indicates the insulation condition of the negative pole of the DC power supply to the ground wire when the first detection component and the second detection component are not connected.

[0068] In the embodiment of the present application, the insulation detection process is performed based on the circuit component to be tested, which can be determined according to the circuit formed by the designed circuit component to be tested and the designed detection method, and the embodiment of the present application does not limit this.

[0069] S130: Determine a performance test result of the circuit component to be tested based on the first resistance value of the insulation resistance and the second resistance value of the insulation resistance.

[0070] In the embodiment of the present application, the performance test result can indicate whether the insulation detection function of the circuit component to be tested is normal and the detection accuracy of the circuit component to be tested.

[0071] Specifically, one or more preset resistance thresholds and resistance ranges can be combined to perform numerical comparisons with the first resistance value of the insulation resistor and the second resistance value of the insulation resistor, respectively, to determine whether the insulation function that can be achieved by the current circuit component under test is normal, and the detection accuracy of the circuit component under test can be determined based on the accuracy of the first resistance value of the insulation resistor and the accuracy of the second resistance value of the insulation resistor.

[0072] In one embodiment of the present application, step S130 may be implemented as follows: S131: Obtain a first reference threshold condition and a second reference threshold condition; the first reference threshold condition indicates the insulation requirement of the DC power supply to the ground when the detection circuit component is connected, and the second reference threshold condition indicates the insulation requirement of the DC power supply to the ground when the detection circuit component is not connected.

[0073] The resistance threshold or resistance range specified in the first reference threshold condition and the resistance threshold or resistance range specified in the second reference threshold condition can be set according to the resistance of each resistor component used in the specific circuit component to be tested, the voltage of the DC power supply, the resistance of the switching resistor in the detection circuit component and the requirements of the safety standards.

[0074] S132: When the first resistance value satisfies a first reference threshold condition and the second resistance value satisfies a second reference threshold condition, determining a performance detection result of the circuit component to be tested, the performance detection result indicating that the insulation detection function of the circuit component to be tested is normal.

[0075] Correspondingly, if the first resistance value does not satisfy the first reference threshold condition or the second resistance value does not satisfy the second reference threshold condition, the performance detection result indicates that the insulation detection function of the circuit component under test is abnormal.

[0076] In one embodiment of the present application, based on Figure 2 or Figure 3 The detection circuit shown in the figure, the method may further include: S140: When the first switching switch is closed and the second switching switch is open, insulation detection processing is performed based on the circuit component to be tested and the first switching resistor to determine a third resistance value of the first insulation resistor.

[0077] The third resistance value of the first insulation resistor indicates the insulation condition of the positive electrode of the DC power supply to the ground wire when only the first detection component is connected.

[0078] Based on S140, the performance detection result may be updated in combination with the third resistance value of the first insulation resistor.

[0079] In one embodiment of the present application, based on Figure 2 or Figure 3 The detection circuit shown in the figure, the method may further include: S150: When the first switching switch is open and the second switching switch is closed, insulation detection processing is performed based on the circuit component to be tested and the second switching resistor to determine a third resistance value of the second insulation resistor.

[0080] The third resistance value of the second insulation resistor indicates the insulation condition of the negative electrode of the DC power supply to the ground wire when only the second detection component is connected.

[0081] Based on S150, the performance detection result may be updated in combination with the third resistance value of the second insulation resistor.

[0082] In the above embodiment, by independently controlling the opening or closing of the first switching switch and the second switching switch, the insulation detection function that can be achieved by the circuit component to be tested can be tested under more diverse path conditions, and the accuracy and reliability of the performance test results can be improved.

[0083] In one embodiment of the present application, based on Figure 2 or Figure 3 The detection circuit shown in Figure 5 As shown, the detection method can be implemented as follows: S111: When the first switching switch and the second switching switch are both closed, insulation detection processing is performed based on the circuit component to be tested, the first switching resistor and the second switching resistor to determine a first resistance value of the first insulation resistor and a first resistance value of the second insulation resistor.

[0084] S140: When the first switching switch is closed and the second switching switch is open, insulation detection processing is performed based on the circuit component to be tested and the first switching resistor to determine a third resistance value of the first insulation resistor.

[0085] S150: When the first switching switch is open and the second switching switch is closed, insulation detection processing is performed based on the circuit component to be tested and the second switching resistor to determine a third resistance value of the second insulation resistor.

[0086] S121: When the first switching switch and the second switching switch are both disconnected, insulation detection processing is performed based on the circuit component to be tested to determine a second resistance value of the first insulation resistor and a second resistance value of the second insulation resistor.

[0087] The above implementation steps can refer to the above embodiments and will not be described in detail here.

[0088] The order of the above-mentioned implementation steps can be changed, and the embodiments of the present application are not limited to this.

[0089] The present application also provides a method for utilizing Figure 3 The detection circuit shown in the figure is used to detect the effectiveness of the insulation detection function of the charging pile, such as Figure 6 As shown, the detection method can be implemented as follows: Step 1: Make sure the charging station is in standby mode and the charging gun of the charging station is not connected to the vehicle.

[0090] The charging station is equipped with Figure 3 The detection circuit shown can prevent damage to the vehicle during detection through the operation described in Step 1.

[0091] Step 2: Close switches C1 and C2.

[0092] Step 3: Disconnect the first switching switch S1 and the second switching switch S2, and perform insulation detection to obtain the insulation resistance R between the positive electrode of the DC power supply and the ground wire. p0 Insulation resistance R between the negative pole of the DC power supply and the ground n0 .

[0093] Step 4: Close the first switching switch S1, open the second switching switch S2, and perform insulation detection to obtain the insulation resistance R between the positive electrode of the DC power supply and the ground wire. p1 Insulation resistance R between the negative pole of the DC power supply and the ground n1 .

[0094] Step 5: Open the first switching switch S1, close the second switching switch S2, and perform insulation detection to obtain the insulation resistance R between the positive electrode of the DC power supply and the ground wire. p2 Insulation resistance R between the negative pole of the DC power supply and the ground n2 .

[0095] Step 6: Close the first switching switch S1, close the second switching switch S2, and perform insulation detection to obtain the insulation resistance R between the positive electrode of the DC power supply and the ground wire. p3 Insulation resistance R between the negative pole of the DC power supply and the ground n3 .

[0096] Step 7: Disconnect the first switching switches S1 and S2, disconnect the switches C1 and C2, and determine the performance test results.

[0097] Specifically, if the above resistance value meets the following conditions ① to ④, and meets the safety requirements of B.5.1 in "GB / T18487.1-2023 Electric Vehicle Conductive Charging System Part 1: General Requirements" in Step 3, and meets the accuracy requirements of 6.3.4.5 in "GB / T 34657.1-2017 Electric Vehicle Charging Equipment Inspection and Test Specification Part 1: Off-board Charger" in Step 6, then the insulation detection function of the charging pile can be considered normal: ①47.5KΩ≤R p1 ≤52.5KΩ; ②47.5KΩ≤R n2 ≤52.5KΩ; ③47.5KΩ≤R p3 ≤52.5KΩ and 47.5KΩ≤R n3 ≤52.5KΩ; ④R p0 >250KΩ and R n0 >250KΩ; Through the above process, when the charging pile is in standby mode, the insulation detection function is started. The detection voltage can be 500V. A total of four insulation tests are performed to test whether the insulation detection function of the positive pole is abnormal, whether the insulation detection function of the negative pole is abnormal, and whether the insulation detection function of the positive and negative poles is abnormal. It can be determined whether the insulation detection function of the charging pile is operating normally and whether the accuracy of the insulation detection function can meet the requirements. When the insulation detection function is detected to be abnormal, it is reported to the operation and maintenance platform and the operation and maintenance personnel are prompted to perform equipment maintenance, which can improve the efficiency of operation and maintenance; at the same time, it is forbidden to start the charging function when the charging pile is connected to the vehicle to ensure charging safety and reliability.

[0098] The embodiment of the present application provides a method for performing insulation detection when the switching switch is disconnected. Figure 3 Based on the detection circuit shown in FIG. 1 , when the first switching switch S1 and the second switching switch S2 are both disconnected, the software, program or instruction controls the first bias switch K p With the second bias switch K n The closing or opening of the first bias resistor R 12 , the second bias resistor R 22 , according to the different voltage values ​​detected when two different bias resistors are connected, the first insulation resistance R is calculated p The resistance value R p0 and the second insulation resistance R n The resistance value R n0 .

[0099] The calculation process of insulation detection can be shown as follows: 1. First bias switch K p Close, the second bias switch K n Disconnect, ADC (analog-digital converter) detects the voltage U between the positive pole of the DC power supply and the ground wire 11 The voltage U between the ground wire and the negative pole of the DC power supply 21 Since the current flowing through the DC positive bus is equal to the current flowing through the DC negative bus, the circuit value of each branch can be calculated first, where: Flowing through the first sampling resistor R 11 The current is U 11 / R 11 ; Flows through the first bias resistor R 12 The current is U 11 / R 12 ; Flowing through the first insulation resistor R p The current is U 11 / R p ; Then the current flowing through the DC positive bus is U 11 / R 11 +U 11 / R 12 +U 11 / R p ; Flowing through the second insulation resistor R n The current is U 21 / R n ; Flowing through the second sampling resistor R 21 The current is U 21 / R 21 ; Then the current flowing through the DC negative bus is U 21 / R n +U 21 / R 21 ; That is, numerically, there is a relationship as shown in equation (1): U 11 / R p + U 11 / R 12 + U 11 / R 11 = U 21 / R n + U 21 / R 21 (1) 2. First bias switch K p Disconnect, the second bias switch Kn Closed, ADC (analog-to-digital converter) detects the voltage U between the positive pole of the DC power supply and the ground wire 12 The voltage U between the ground wire and the negative pole of the DC power supply 22 , since the current flowing through the DC positive bus is equal to the current flowing through the DC negative bus, equation (2) can be obtained by the same logic: U 12 / R p + U 12 / R 11 =U 22 / R n + U 22 / R 21 + U 22 / R 22 (2) 3. Combine equations (1) and (2) to obtain a set of two-variable linear equations, which can be used to calculate the first insulation resistance R when both the first switching switch S1 and the second switching switch S2 are disconnected. p The resistance value R p0 and the second insulation resistance R n The resistance value R n0 .

[0100] When the first switching switch S1 is closed, it can be regarded as a first sampling resistor R 11 The first switching resistor R3 connected in parallel forms a new third sampling resistor with a resistance value of R 11 / / R3, where / / represents a parallel relationship. Therefore, when a new third sampling resistor is connected, the insulation detection process provided in the above embodiment can be referred to for detection, and the insulation resistance R between the positive electrode of the DC power supply and the ground line can be obtained when the first switching switch S1 is closed and the second switching switch S2 is opened. p1 Insulation resistance R between the negative pole of the DC power supply and the ground n1 .

[0101] Similarly, when the second switching switch S2 is closed, it can be regarded as connecting the second sampling resistor R 21 The second switching resistor R4 connected in parallel forms a new fourth sampling resistor with a resistance value of R 21 / / R4. Therefore, when the new fourth sampling resistor is connected, the insulation detection process provided in the above embodiment can be referred to for detection, and the insulation resistance R between the positive electrode of the DC power supply and the ground line can be obtained when the first switching switch S1 is disconnected and the second switching switch S2 is closed. p2 Insulation resistance R between the negative pole of the DC power supply and the ground n2 .

[0102] Similarly, when the first switching switch S1 is closed and the second switching switch S2 is closed, it can be regarded as connecting the first sampling resistor R 11 The first switching resistor R3 connected in parallel forms a new third sampling resistor with a resistance value of R 11 / / R3, and connected to the second sampling resistor R 21 The second switching resistor R4 connected in parallel forms a new fourth sampling resistor with a resistance value of R 21 / / R4. Therefore, when the new third sampling resistor and the new fourth sampling resistor are connected, the insulation detection process provided in the above embodiment can be referred to for detection, and the insulation resistance R between the positive electrode of the DC power supply and the ground line can be obtained when the first switching switch S1 is closed and the second switching switch S2 is closed. p3 Insulation resistance R between the negative pole of the DC power supply and the ground n3 .

[0103] The present application also provides a detection device 700, such as Figure 7 As shown, the detection device 700 may include: The first insulation detection module 710 is used to perform insulation detection processing based on the switching resistance of the circuit component to be tested and the detection circuit component when the switching switch of the detection circuit component is closed, and determine a first resistance value of the insulation resistance in the circuit component to be tested; the first resistance value represents the insulation condition of the DC power supply to the ground line when the detection circuit component is connected; A second insulation detection module 720 is used to perform insulation detection processing based on the circuit component to be tested, and determine a second resistance value of the insulation resistance in the circuit component to be tested when the switching switch of the detection circuit component is disconnected; the second resistance value represents the insulation condition of the DC power supply to the ground line when the detection circuit component is not connected; The performance detection module 730 is used to determine the performance detection result of the circuit component under test based on the first resistance value of the insulation resistance and the second resistance value of the insulation resistance, and the performance detection result indicates whether the insulation detection function of the circuit component under test is normal and the detection accuracy of the circuit component under test.

[0104] In one embodiment of the present application, the performance detection module 730 may include: a condition acquisition unit, configured to acquire a first reference threshold condition and a second reference threshold condition; the first reference threshold condition indicating the insulation requirement of the DC power supply to the ground wire when the detection circuit component is connected, and the second reference threshold condition indicating the insulation requirement of the DC power supply to the ground wire when the detection circuit component is not connected; A performance detection result determination unit is used to determine the performance detection result of the circuit component under test when the first resistance value meets the first reference threshold condition and the second resistance value meets the second reference threshold condition, and the performance detection result indicates that the insulation detection function of the circuit component under test is normal.

[0105] In one embodiment of the present application, the insulation resistor includes a first insulation resistor and a second insulation resistor, the first end of the first insulation resistor is connected to the positive electrode of the DC power supply, the second end of the first insulation resistor is connected to the ground wire, the first end of the second insulation resistor is connected to the negative electrode of the DC power supply, and the second end of the second insulation resistor is connected to the ground wire; the detection circuit component includes a first detection component and a second detection component, the first end of the first detection component is connected to the positive electrode of the DC power supply, the second end of the first detection component is connected to the ground wire, the first end of the second detection component is connected to the negative electrode of the DC power supply, and the second end of the second detection component is connected to the ground wire, the first detection component includes a first switching switch and a first switching resistor connected in series, and the second detection component includes a second switching switch and a second switching resistor connected in series; The first insulation detection module 710 may include: The first insulation detection unit is used to perform insulation detection processing based on the circuit component to be tested, the first switching resistor and the second switching resistor when the first switching switch and the second switching switch are both closed, and determine a first resistance value of the first insulation resistor and a first resistance value of the second insulation resistor, wherein the first resistance value of the first insulation resistor indicates the insulation condition of the positive electrode of the DC power supply to the ground wire when the first detection component and the second detection component are connected, and the first resistance value of the second insulation resistor indicates the insulation condition of the negative electrode of the DC power supply to the ground wire when the first detection component and the second detection component are connected.

[0106] In one embodiment of the present application, the insulation resistor includes a first insulation resistor and a second insulation resistor, the first end of the first insulation resistor is connected to the positive electrode of the DC power supply, the second end of the first insulation resistor is connected to the ground wire, the first end of the second insulation resistor is connected to the negative electrode of the DC power supply, and the second end of the second insulation resistor is connected to the ground wire; the detection circuit component includes a first detection component and a second detection component, the first end of the first detection component is connected to the positive electrode of the DC power supply, the second end of the first detection component is connected to the ground wire, the first end of the second detection component is connected to the negative electrode of the DC power supply, and the second end of the second detection component is connected to the ground wire, the first detection component includes a first switching switch and a first switching resistor connected in series, and the second detection component includes a second switching switch and a second switching resistor connected in series; The second insulation detection module 720 may include: A second insulation detection unit is used to perform insulation detection processing based on the circuit component to be tested when the first switching switch and the second switching switch are both disconnected, to determine the second resistance value of the first insulation resistor and the second resistance value of the second insulation resistor, the second resistance value of the first insulation resistor indicating the insulation condition of the positive electrode of the DC power supply to the ground wire when the first detection component and the second detection component are not connected, and the second resistance value of the second insulation resistor indicating the insulation condition of the negative electrode of the DC power supply to the ground wire when the first detection component and the second detection component are not connected.

[0107] In one embodiment of the present application, the detection device 700 may further include: A third insulation detection unit is used to perform insulation detection processing based on the circuit component to be tested and the first switching resistor when the first switching switch is closed and the second switching switch is open, so as to determine a third resistance value of the first insulation resistor, wherein the third resistance value of the first insulation resistor indicates the insulation condition of the positive electrode of the DC power supply to the ground wire when only the first detection component is connected.

[0108] In one embodiment of the present application, the detection device 700 may further include: A fourth insulation detection unit is used to perform insulation detection processing based on the circuit component to be tested and the second switching resistor when the first switching switch is open and the second switching switch is closed, so as to determine a third resistance value of the second insulation resistor, wherein the third resistance value of the second insulation resistor indicates the insulation condition of the negative electrode of the DC power supply to the ground wire when only the second detection component is connected.

[0109] In the embodiments of the present application, the term "module" or "unit" refers to a computer program or a part of a computer program that has a predetermined function and works together with other related parts to achieve a predetermined goal, and can be implemented in whole or in part by using software, hardware (such as processing circuits or memories), or a combination thereof. Similarly, a processor (or multiple processors or memories) can be used to implement one or more modules or units. In addition, each module or unit can be part of an overall module or unit that includes the function of the module or unit.

[0110] It should be noted that the device provided in the above embodiment, when implementing its functions, is only illustrated by the division of the above functional modules. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. In addition, the device and method embodiments provided in the above embodiment belong to the same concept, and the specific implementation process is detailed in the method embodiment, which will not be repeated here.

[0111] The embodiment of the present application also provides a charging pile, which is configured with a detection circuit as provided in the embodiment of the present application and can execute a detection method provided in the embodiment of the present application.

Claims

1. A detection circuit, characterized in that: The circuit comprises: A circuit component to be tested, the circuit component to be tested is used for insulation detection, and the circuit component to be tested includes an insulation resistor; a first end of the circuit component to be tested is connected to a DC power supply, and a second end of the circuit component to be tested is connected to a ground wire; A detection circuit assembly comprises a switching switch and a switching resistor, wherein the switching switch and the switching resistor are connected in series, a first end of the detection circuit assembly is connected to the DC power supply, and a second end of the detection circuit assembly is connected to the ground line; The circuit component to be tested and the detection circuit component are connected in parallel, and the detection circuit component is used to perform performance detection on the circuit component to be tested.

2. The detection circuit according to claim 1, characterized in that: The detection circuit assembly comprises: A first detection component includes a first switching switch among the switching switches and a first switching resistor among the switching resistors, wherein the first switching switch is connected in series with the first switching resistor; The first end of the first detection component is connected to the positive electrode of the DC power supply, and the second end of the first detection component is connected to the ground wire.

3. The detection circuit according to claim 2, characterized in that: The circuit component to be tested comprises: A first component to be tested includes a first sampling resistor; A second component under test includes a first bias switch and a first bias resistor; the first bias switch and the first bias resistor are connected in series; A third component to be tested includes a first insulation resistor among the insulation resistors; The first component under test, the second component under test, the third component under test and the first detection component are connected in parallel.

4. The detection circuit according to claim 1, characterized in that: The detection circuit assembly comprises: A second detection component includes a second switching switch in the switching switch and a second switching resistor in the switching resistor, wherein the second switching switch is connected in series with the second switching resistor; The first end of the second detection component is connected to the negative electrode of the DC power supply, and the second end of the second detection component is connected to the ground wire.

5. The detection circuit according to claim 4, characterized in that: The circuit component to be tested comprises: The fourth component under test includes a second sampling resistor; a fifth component under test, comprising a second bias switch and a second bias resistor, wherein the second bias switch and the second bias resistor are connected in series; a sixth component under test, comprising a second insulation resistor among the insulation resistors; The fourth component under test, the fifth component under test, the sixth component under test and the second detection component are connected in parallel.

6. A detection method, characterized in that: The detection circuit applied to any one of claims 1 to 5, the method comprising: When the switching switch of the detection circuit component is closed, an insulation detection process is performed based on the switching resistance of the circuit component to be tested and the detection circuit component to determine a first resistance value of the insulation resistance in the circuit component to be tested; the first resistance value represents the insulation condition of the DC power supply to the ground wire when the detection circuit component is connected; When the switching switch of the detection circuit assembly is disconnected, an insulation detection process is performed based on the circuit assembly to be tested to determine a second resistance value of the insulation resistance in the circuit assembly to be tested; the second resistance value represents the insulation condition of the DC power supply to the ground wire when the detection circuit assembly is not connected; Based on the first resistance value of the insulation resistance and the second resistance value of the insulation resistance, a performance detection result of the circuit component under test is determined, and the performance detection result indicates whether the insulation detection function of the circuit component under test is normal and the detection accuracy of the circuit component under test.

7. The detection method according to claim 6, characterized in that: The determining the performance test result of the circuit component to be tested based on the first resistance value of the insulation resistance and the second resistance value of the insulation resistance includes: Acquire a first reference threshold condition and a second reference threshold condition; the first reference threshold condition indicates the insulation requirement of the DC power supply to the ground wire when the detection circuit component is connected, and the second reference threshold condition indicates the insulation requirement of the DC power supply to the ground wire when the detection circuit component is not connected; When the first resistance value satisfies the first reference threshold condition and the second resistance value satisfies the second reference threshold condition, a performance detection result of the circuit component under test is determined, and the performance detection result indicates that the insulation detection function of the circuit component under test is normal.

8. The detection method according to claim 6, characterized in that: The insulation resistor includes a first insulation resistor and a second insulation resistor, wherein the first end of the first insulation resistor is connected to the positive electrode of the DC power supply, the second end of the first insulation resistor is connected to the ground wire, the first end of the second insulation resistor is connected to the negative electrode of the DC power supply, and the second end of the second insulation resistor is connected to the ground wire; the detection circuit component includes a first detection component and a second detection component, wherein the first end of the first detection component is connected to the positive electrode of the DC power supply, the second end of the first detection component is connected to the ground wire, the first end of the second detection component is connected to the negative electrode of the DC power supply, and the second end of the second detection component is connected to the ground wire, the first detection component includes a first switching switch and a first switching resistor connected in series, and the second detection component includes a second switching switch and a second switching resistor connected in series; When the switching switch of the detection circuit component is closed, performing insulation detection processing based on the switching resistance of the circuit component to be tested and the detection circuit component to determine a first resistance value of the insulation resistance in the circuit component to be tested, includes: When the first switching switch and the second switching switch are both closed, insulation detection processing is performed based on the circuit component to be tested, the first switching resistor and the second switching resistor to determine a first resistance value of the first insulation resistor and a first resistance value of the second insulation resistor, the first resistance value of the first insulation resistor indicates the insulation condition of the positive electrode of the DC power supply to the ground wire when the first detection component and the second detection component are connected, and the first resistance value of the second insulation resistor indicates the insulation condition of the negative electrode of the DC power supply to the ground wire when the first detection component and the second detection component are connected.

9. The detection method according to claim 6, characterized in that: The insulation resistor includes a first insulation resistor and a second insulation resistor, wherein the first end of the first insulation resistor is connected to the positive electrode of the DC power supply, the second end of the first insulation resistor is connected to the ground wire, the first end of the second insulation resistor is connected to the negative electrode of the DC power supply, and the second end of the second insulation resistor is connected to the ground wire; the detection circuit component includes a first detection component and a second detection component, wherein the first end of the first detection component is connected to the positive electrode of the DC power supply, the second end of the first detection component is connected to the ground wire, the first end of the second detection component is connected to the negative electrode of the DC power supply, and the second end of the second detection component is connected to the ground wire, the first detection component includes a first switching switch and a first switching resistor connected in series, and the second detection component includes a second switching switch and a second switching resistor connected in series; When the switching switch of the detection circuit component is disconnected, performing insulation detection processing based on the circuit component to be tested to determine a second resistance value of the insulation resistance in the circuit component to be tested includes: When the first switching switch and the second switching switch are both disconnected, insulation detection processing is performed based on the circuit component to be tested to determine the second resistance value of the first insulation resistor and the second resistance value of the second insulation resistor, the second resistance value of the first insulation resistor indicates the insulation condition of the positive electrode of the DC power supply to the ground wire when the first detection component and the second detection component are not connected, and the second resistance value of the second insulation resistor indicates the insulation condition of the negative electrode of the DC power supply to the ground wire when the first detection component and the second detection component are not connected.

10. The detection method according to claim 8 or 9, characterized in that: The method further comprises: When the first switching switch is closed and the second switching switch is open, insulation detection processing is performed based on the circuit component to be tested and the first switching resistor to determine the third resistance value of the first insulation resistor, and the third resistance value of the first insulation resistor indicates the insulation condition of the positive electrode of the DC power supply to the ground wire when only the first detection component is connected.

11. The detection method according to claim 8 or 9, characterized in that: The method further comprises: When the first switching switch is open and the second switching switch is closed, insulation detection processing is performed based on the circuit component to be tested and the second switching resistor to determine a third resistance value of the second insulation resistor, and the third resistance value of the second insulation resistor indicates the insulation condition of the negative electrode of the DC power supply to the ground wire when only the second detection component is connected.

12. A detection device, characterized in that: The detection circuit applied to any one of claims 1 to 5, the device comprising: A first insulation detection module is used to perform insulation detection processing based on the switching resistance of the circuit component to be tested and the detection circuit component when the switching switch of the detection circuit component is closed, and determine a first resistance value of the insulation resistance in the circuit component to be tested; the first resistance value represents the insulation condition of the DC power supply to the ground line when the detection circuit component is connected; A second insulation detection module is used to perform insulation detection processing based on the circuit component to be tested when the switching switch of the detection circuit component is disconnected, and determine a second resistance value of the insulation resistance in the circuit component to be tested; the second resistance value represents the insulation condition of the DC power supply to the ground wire when the detection circuit component is not connected; A performance detection module is used to determine a performance detection result of the circuit component to be tested based on the first resistance value of the insulation resistance and the second resistance value of the insulation resistance, wherein the performance detection result indicates whether the insulation detection function of the circuit component to be tested is normal and the detection accuracy of the circuit component to be tested.

13. A charging pile, characterized in that: The charging pile is equipped with a detection circuit as claimed in any one of claims 1 to 5.

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