Split-type DC charging pile insulation detection circuit

Abstract

The utility model discloses a split-type DC charging pile insulation detection circuit, which is used for butt joint with an output end J1 of a split-type DC charging pile. The split type direct current charging pile insulation detection circuit comprises a first acquisition loop, the first acquisition loop comprises a high-voltage dry reed relay K1, an operational amplifier PA1 and an operational amplifier PA2, the fourth end of the high-voltage dry reed relay K1 is electrically connected with one electrode of the output end J1 of the split type direct current charging pile, and the third end of the high-voltage dry reed relay K1 is electrically connected with a resistor R1. The split-type DC charging pile insulation detection circuit disclosed by the utility model has the beneficial effects that by arranging the 0.1% precision sampling resistor with the specification of 3.33 K, when analog signals of the first acquisition loop and the second acquisition loop are acquired at the analog signal acquisition end, the sampling precision is relatively high, and the sampling precision is relatively high; therefore, the split-type DC charging pile insulation detection circuit has high insulation detection precision.

Description

Technical Field

[0001] The utility model belongs to the field of insulation detection, and specifically relates to a split-type DC charging pile insulation detection circuit. Background Art

[0002] The announcement number is CN219143024U, the subject name is a utility model patent for an insulation detection circuit for a high-power DC charging pile of an electric vehicle, and its IPC classification number is G01R31 / 14, G01R19 / 25. Its technical solution discloses "comprising a positive bus grounding resistor Rp, a negative bus grounding resistor Rn, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a DC+ terminal, a DC- terminal, a PE terminal, a switch K1, a switch K2, a switch K3, an analog-to-digital conversion circuit 1, an analog-to-digital conversion circuit 2, and a control module; the DC+ terminal is respectively connected to the positive bus grounding resistor Rp One end of the positive bus grounding resistor Rp is respectively connected to the PE end, one end of the negative bus grounding resistor Rn and the start end of the switch K3, the other end of the resistor R10 is respectively connected to one end of the resistor R11, one end of the capacitor C1, one end of the capacitor C2 and one end of the analog-to-digital conversion circuit 1, the other end of the resistor R14 is respectively connected to one end of the resistor R15 and the closed end of the switch K1, the other end of the resistor R11 is respectively connected to the other end of the capacitor C1, the other end of the capacitor C2, one end of the capacitor C3, one end of the capacitor C4, the other end of the resistor R15, one end of the resistor R12, one end of the resistor R16, the start end of the switch K1, the closed end of the switch K2, the closed end of the switch K3 and are grounded.

[0003] It can be seen that the above utility model patent discloses one insulation detection circuit of a DC charging pile, which has a certain detection accuracy. The present application provides another insulation detection circuit to further improve the insulation detection accuracy. Utility Model Content

[0004] The utility model aims at the existing technical situation, overcomes the above defects and provides a split type DC charging pile insulation detection circuit.

[0005] The utility model adopts the following technical scheme, a split DC charging pile insulation detection circuit, which is used to connect the split DC charging pile output terminal J1, and the split DC charging pile insulation detection circuit includes:

[0006] The first acquisition circuit includes a high-voltage reed relay K1, an operational amplifier PA1 and an operational amplifier PA2. Terminal 4 of the high-voltage reed relay K1 is electrically connected to one of the electrodes of the split DC charging pile output terminal J1. Terminal 3 of the high-voltage reed relay K1 is electrically connected to the resistor R1. The common terminal between the resistor R1 and the precision sampling resistor R3 and terminal 3 of the operational amplifier PA1 is electrically connected. Terminal 13 of the operational amplifier PA2 is electrically connected to the common terminal between the terminal 1 of the operational amplifier PA1 and the terminal 2 of the operational amplifier PA1 through the resistor R7. A resistor R8 is connected in parallel between terminal 14 of the operational amplifier PA2 and terminal 13 of the operational amplifier PA2.

[0007] The second acquisition circuit includes a high-voltage reed relay K2, an operational amplifier PA3 and an operational amplifier PA4. Terminal 4 of the high-voltage reed relay K2 is electrically connected to another electrode of the split DC charging pile output terminal J1, terminal 3 of the high-voltage reed relay K2 is electrically connected to resistor R5, a common terminal between resistor R5 and precision sampling resistor R4 and terminal 5 of operational amplifier PA3 is electrically connected, terminal 9 of operational amplifier PA4 is electrically connected to a common terminal between terminal 7 of operational amplifier PA3 and terminal 6 of operational amplifier PA3 through resistor R12, and a resistor R13 is connected in parallel between terminal 8 of operational amplifier PA4 and terminal 9 of operational amplifier PA4.

[0008] As a further preferred technical solution of the above technical solution, it also includes a photoelectric solid-state relay OC1 and a relay driver chip U1:

[0009] The common end between terminal 3 of the high-voltage reed relay K1 and the resistor R1 is electrically connected to terminal 8 of the photoelectric solid-state relay OC1 through the resistor R2;

[0010] The common end between terminal 3 of the high-voltage reed relay K2 and the resistor R5 is electrically connected to terminal 5 of the photoelectric solid-state relay OC1 through the resistor R15;

[0011] Terminal 2 of the photoelectric solid-state relay OC1 is electrically connected to terminal 13 of the relay driver chip U1;

[0012] Terminal 4 of the photoelectric solid-state relay OC1 is electrically connected to terminal 14 of the relay driver chip U1.

[0013] As a further preferred technical solution of the above technical solution, it also includes a high-voltage reed relay K3, and terminal 1 of the high-voltage reed relay K3 is electrically connected to terminal 1 of the high-voltage reed relay K2, terminal 15 of the relay driver chip U1, and terminal 1 of the high-voltage reed relay K1.

[0014] As a further preferred technical solution of the above technical solution, terminal 7 of the photoelectric solid-state relay OC1 and terminal 6 of the photoelectric solid-state relay OC1 are grounded at the same time.

[0015] As a further preferred technical solution of the above technical solution, terminal 1 of the photoelectric solid-state relay OC1 is electrically connected to the 5V power supply through a resistor R9, and terminal 3 of the photoelectric solid-state relay OC1 is electrically connected to the 5V power supply through a resistor R10.

[0016] The split-type DC charging pile insulation detection circuit disclosed by the utility model has the beneficial effect that, by setting precision sampling resistors (precision sampling resistor R3 and precision sampling resistor R5) with a specification of 3.33K 0.1%, the analog signals of the first acquisition loop and the second acquisition loop have higher sampling accuracy when they are collected at the analog signal acquisition end, so that the split-type DC charging pile insulation detection circuit has higher insulation detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is the main circuit structure diagram (circuit principle diagram) of this application. DETAILED DESCRIPTION

[0018] The utility model discloses a split type DC charging pile insulation detection circuit, which is described in conjunction with a preferred embodiment (embodiment 1) and with reference to the accompanying drawings. Figure 1 , the specific implementation methods of the utility model are further described.

[0019] See attached figure Figure 1 , Figure 1 The main circuit structure of the split-type DC charging pile insulation detection circuit is shown.

[0020] Example 1.

[0021] Preferably, the split DC charging pile insulation detection circuit is used to connect to the split DC charging pile output terminal J1, and the split DC charging pile insulation detection circuit includes:

[0022] The first acquisition loop includes a high-voltage reed relay K1, an operational amplifier PA1 and an operational amplifier PA2. Terminal 4 of the high-voltage reed relay K1 is electrically connected to one of the electrodes (V+) of the split DC charging pile output terminal J1. Terminal 3 of the high-voltage reed relay K1 is electrically connected to the resistor R1. The resistor R1 and the precision sampling resistor R3 are electrically connected to the common terminal of terminal 3 of the operational amplifier PA1. Terminal 13 of the operational amplifier PA2 is electrically connected to the common terminal between terminal 1 of the operational amplifier PA1 and terminal 2 of the operational amplifier PA1 through the resistor R7. A resistor R8 is connected in parallel between terminal 14 of the operational amplifier PA2 and terminal 13 of the operational amplifier PA2, so that terminal 14 of the operational amplifier PA2 can be used as the analog signal acquisition terminal of the first acquisition loop;

[0023] The second acquisition circuit includes a high-voltage reed relay K2, an operational amplifier PA3 and an operational amplifier PA4. Terminal 4 of the high-voltage reed relay K2 is electrically connected to another electrode (V-) of the split-type DC charging pile output terminal J1, terminal 3 of the high-voltage reed relay K2 is electrically connected to resistor R5, and a common terminal between resistor R5 and precision sampling resistor R4 and terminal 5 of the operational amplifier PA3 is electrically connected. Terminal 9 of the operational amplifier PA4 is electrically connected to a common terminal between terminal 7 of the operational amplifier PA3 and terminal 6 of the operational amplifier PA3 through resistor R12. A resistor R13 is connected in parallel between terminal 8 of the operational amplifier PA4 and terminal 9 of the operational amplifier PA4, so that terminal 8 of the operational amplifier PA4 can be used as an analog signal acquisition terminal of the second acquisition circuit, thereby making the analog signal acquisition terminal of the first acquisition circuit and the analog signal acquisition terminal of the second acquisition circuit together constitute a detection circuit for insulation detection of the split-type DC charging pile output terminal J1.

[0024] Among them, the split DC charging pile insulation detection circuit also includes a photoelectric solid-state relay OC1 and a relay driver chip U1:

[0025] The common end between terminal 3 of the high-voltage reed relay K1 and the resistor R1 is electrically connected to terminal 8 of the photoelectric solid-state relay OC1 through the resistor R2;

[0026] The common end between terminal 3 of the high-voltage reed relay K2 and the resistor R5 is electrically connected to terminal 5 of the photoelectric solid-state relay OC1 through the resistor R15;

[0027] Terminal 2 of the photoelectric solid-state relay OC1 is electrically connected to terminal 13 of the relay driver chip U1;

[0028] Terminal 4 of the photoelectric solid-state relay OC1 is electrically connected to terminal 14 of the relay driver chip U1.

[0029] Among them, the split-type DC charging pile insulation detection circuit also includes a high-voltage reed relay K3, and terminal 1 of the high-voltage reed relay K3 is electrically connected to terminal 1 of the high-voltage reed relay K2, terminal 15 of the relay driver chip U1, and terminal 1 of the high-voltage reed relay K1.

[0030] Among them, terminal 7 of the photoelectric solid-state relay OC1 and terminal 6 of the photoelectric solid-state relay OC1 are grounded at the same time.

[0031] The terminal 1 of the photoelectric solid-state relay OC1 is electrically connected to the 5V power supply through the resistor R9 , and the terminal 3 of the photoelectric solid-state relay OC1 is electrically connected to the 5V power supply through the resistor R10 .

[0032] Among them, the model of the photoelectric solid-state relay OC1 is preferably AQW216EH.

[0033] The relay driver chip U1 preferably adopts ULN2003D.

[0034] The specifications of the precision sampling resistors R3 and R5 are preferably 3.33K 0.1%, and the models or specifications of the other electrical components refer to the attached drawings. Figure 1 .

[0035] It should be noted that the split-type DC charging pile insulation detection circuit disclosed in this embodiment, by setting precision sampling resistors (precision sampling resistor R3 and precision sampling resistor R5) with a specification of 3.33K 0.1%, makes the analog signals of the first acquisition loop and the second acquisition loop have higher sampling accuracy when they are collected at the analog signal acquisition end, so that the split-type DC charging pile insulation detection circuit has higher insulation detection accuracy.

[0036] In addition, since the split-type DC charging pile intersects with the integrated DC charging pile, it has a higher insulation level. Once the insulation fails or the insulation level decreases, it will cause safety hazards. Therefore, it is necessary to strengthen the insulation detection of the split-type DC charging pile.

[0037] It is worth mentioning that the technical features such as the specific model of the operational amplifier PA1 involved in this utility model patent application should be regarded as the prior art. The specific structure, working principle and possible control method and spatial layout method of these technical features can be selected according to the conventional methods in the field and should not be regarded as the inventive point of this utility model patent. This utility model patent will not be further elaborated.

[0038] For those skilled in the art, it is still possible to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A split DC charging pile insulation detection circuit, used for connecting the split DC charging pile output terminal J1, characterized in that: The split type DC charging pile insulation detection circuit includes: The first acquisition circuit includes a high-voltage reed relay K1, an operational amplifier PA1 and an operational amplifier PA2. Terminal 4 of the high-voltage reed relay K1 is electrically connected to one of the electrodes of the split DC charging pile output terminal J1. Terminal 3 of the high-voltage reed relay K1 is electrically connected to the resistor R1. The common terminal between the resistor R1 and the precision sampling resistor R3 and terminal 3 of the operational amplifier PA1 is electrically connected. Terminal 13 of the operational amplifier PA2 is electrically connected to the common terminal between the terminal 1 of the operational amplifier PA1 and the terminal 2 of the operational amplifier PA1 through the resistor R7. A resistor R8 is connected in parallel between terminal 14 of the operational amplifier PA2 and terminal 13 of the operational amplifier PA2. The second acquisition circuit includes a high-voltage reed relay K2, an operational amplifier PA3 and an operational amplifier PA4. Terminal 4 of the high-voltage reed relay K2 is electrically connected to another electrode of the split DC charging pile output terminal J1, terminal 3 of the high-voltage reed relay K2 is electrically connected to resistor R5, a common terminal between resistor R5 and precision sampling resistor R4 and terminal 5 of operational amplifier PA3 is electrically connected, terminal 9 of operational amplifier PA4 is electrically connected to a common terminal between terminal 7 of operational amplifier PA3 and terminal 6 of operational amplifier PA3 through resistor R12, and a resistor R13 is connected in parallel between terminal 8 of operational amplifier PA4 and terminal 9 of operational amplifier PA4.

2. The split type DC charging pile insulation detection circuit according to claim 1 is characterized in that: It also includes the optoelectronic solid-state relay OC1 and the relay driver chip U1: The common end between terminal 3 of the high-voltage reed relay K1 and the resistor R1 is electrically connected to terminal 8 of the photoelectric solid-state relay OC1 through the resistor R2; The common end between terminal 3 of the high-voltage reed relay K2 and the resistor R5 is electrically connected to terminal 5 of the photoelectric solid-state relay OC1 through the resistor R15; Terminal 2 of the photoelectric solid-state relay OC1 is electrically connected to terminal 13 of the relay driver chip U1; Terminal 4 of the photoelectric solid-state relay OC1 is electrically connected to terminal 14 of the relay driver chip U1.

3. The split type DC charging pile insulation detection circuit according to claim 2 is characterized in that: It also includes a high-voltage reed relay K3, and terminal 1 of the high-voltage reed relay K3 is electrically connected to terminal 1 of the high-voltage reed relay K2, terminal 15 of the relay driver chip U1, and terminal 1 of the high-voltage reed relay K1.

4. The split type DC charging pile insulation detection circuit according to claim 2, characterized in that: Terminal 7 of the photoelectric solid-state relay OC1 and terminal 6 of the photoelectric solid-state relay OC1 are grounded at the same time.

5. The split type DC charging pile insulation detection circuit according to claim 2, characterized in that: Terminal 1 of the photoelectric solid-state relay OC1 is electrically connected to the 5V power supply through the resistor R9 , and terminal 3 of the photoelectric solid-state relay OC1 is electrically connected to the 5V power supply through the resistor R10 .

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