CN220983440U - Fault detection circuit of charging pile direct current output fuse - Google Patents
Fault detection circuit of charging pile direct current output fuse Download PDFInfo
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- CN220983440U CN220983440U CN202322111111.7U CN202322111111U CN220983440U CN 220983440 U CN220983440 U CN 220983440U CN 202322111111 U CN202322111111 U CN 202322111111U CN 220983440 U CN220983440 U CN 220983440U
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- 239000003990 capacitor Substances 0.000 claims description 20
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- 101100489713 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) GND1 gene Proteins 0.000 description 6
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- 101100489717 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) GND2 gene Proteins 0.000 description 3
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Abstract
The utility model discloses a fault detection circuit of a charging pile direct current output fuse, which comprises an AC/DC module, a direct current power supply loop contactor and a control circuit, wherein the direct current output fuse is connected in series in a direct current bus between the output end of the charging pile AC/DC module and the contact point of the direct current power supply loop contactor; the output end of the voltage detection circuit and the output end of the current detection circuit are respectively connected with a controller of the charging pile control circuit. The fault detection circuit can rapidly detect the fault of the fuse, and the charging pile cuts off the direct current output, so that the safety of a later-stage circuit can be ensured.
Description
[ Technical field ]
The utility model relates to a charging pile, in particular to a fault detection circuit of a direct-current output fuse of the charging pile.
[ Background Art ]
According to national standard GB/T18487.1-2015 electric automobile conduction charging System part 1: in annex B of the general requirement, it is required that the dc charging system must be provided with a fuse. When the grid (power supply) does not provide overload protection, the power supply equipment should provide overload protection for cables of various sizes in each connection.
Annex B.1 of national standard GB/T18487.1-2015 provides a direct current charging control guidance circuit and control principle, as shown in figure 1, comprising an off-board charger controller, resistors R1, R2, R3, R4, R5, a switch S, direct current supply loop contactors K1 and K2, a low voltage auxiliary power supply loop (voltage: 12V +/-5%, current 10A) contactors K3 and K4, charging loop contactors K5 and K6 and a vehicle controller, wherein the vehicle control device can be integrated in a battery management system. Resistors R2 and R3 are mounted on the vehicle plug and resistor R4 is mounted on the vehicle socket. The switch S is an internal normally closed switch of the vehicle plug, and is closed after the vehicle plug is completely connected with the vehicle socket. During the entire charging process, the off-board charger control device should be able to monitor contactors K1, K2, contactors K3, K4. The electric vehicle control device should be able to monitor the states of the contactors K5 and K6 and control the on and off thereof. The fuse is connected in series in the direct current bus between the output end of the charging pile AC/DC module and the direct current power supply loop contactors K1 and K2, but the circuit is not provided with a fault detection circuit of the fuse, when the fuse has an open circuit/fusing fault, the charging pile system cannot accurately identify the fuse fault and timely handle the fuse, if the charging is repeatedly conducted blindly, pile body secondary damage is easy to occur, and personal safety of a user is endangered.
[ Summary of the invention ]
The utility model aims to provide a charging pile direct current output fuse fault detection circuit capable of timely identifying fuse faults.
In order to solve the technical problems, the technical scheme adopted by the utility model is that the fault detection circuit of the direct current output fuse of the charging pile comprises an AC/DC module, a direct current power supply loop contactor and a control circuit, wherein the direct current output fuse is connected in series in a direct current bus between the output end of the AC/DC module of the charging pile and the contact point of the direct current power supply loop contactor, the fault detection circuit comprises a first voltage detection circuit, a second voltage detection circuit and a current detection circuit, the sampling point of the first voltage detection circuit is positioned at the output end of the AC/DC module, the sampling point of the second voltage detection circuit is positioned at the output end of the two contact points of the direct current power supply loop contactor, and the sampling point of the current detection circuit is positioned at the direct current bus; the output end of the first voltage detection circuit, the output end of the second voltage detection circuit and the output end of the current detection circuit are respectively connected with a controller of the charging pile control circuit.
The fault detection circuit comprises a first subtracter, wherein a first input end of the first subtracter is connected with the positive electrode of the output end of the AC/DC module, a second input end of the first subtracter is connected with the ground, and the output end of the first subtracter is connected with the controller.
The fault detection circuit comprises a first subtracter, wherein the non-inverting input end of the first power amplifier is connected with the positive electrode of the output end of the AC/DC module through a thirteenth resistor and is grounded through a fifteenth resistor; the inverting input end of the first power amplifier is grounded through a fourteenth resistor and is connected with the output end of the first power amplifier through a sixteenth resistor; the output end of the first power amplifier is connected with the controller through a seventeenth resistor.
The fault detection circuit comprises a current divider and a second subtracter, wherein the current divider is connected in series in a direct current positive bus, a first end of the current divider is connected with the positive electrode of the output end of the AC/DC module, and a second end of the current divider is connected with the direct current output fuse; the first input end of the second subtracter is connected with the positive electrode of the output end of the AC/DC module, the second input end of the second subtracter is connected with the second end of the shunt, and the output end of the second subtracter is connected with the controller.
The fault detection circuit comprises a first subtracter, a second subtracter and a third subtracter, wherein the first subtracter comprises a first power amplifier, the non-inverting input end of the first power amplifier is connected with the positive electrode of the output end of the AC/DC module through a first resistor, and the first subtracter is grounded through a second resistor; the inverting input end of the second power amplifier is connected with the second end of the shunt through a thirty-first resistor and is connected with the output end of the second power amplifier through an eleventh resistor; the output end of the second power amplifier is connected with the controller through a twelfth resistor.
The fault detection circuit comprises a second voltage detection circuit and a third voltage detection circuit, wherein the second voltage detection circuit comprises an isolation chip and a third subtracter, and the third subtracter comprises a third power amplifier; the first differential signal input pin of the isolation chip is connected with the output end of the first contact of the direct current power supply loop contactor through a first resistor, and the second differential signal input pin is connected with the output end of the second contact of the direct current power supply loop contactor through a second resistor; the third resistor is connected between the first differential signal input pin of the isolation chip and the grounding pin of the input end of the isolation chip, and the grounding pin of the input end of the isolation chip is connected with the second differential signal input pin; the non-inverting input end of the third power amplifier is connected with a first differential signal output pin of the isolation chip through a fourth resistor and grounded through a sixth resistor; the inverting input end of the third power amplifier is connected with the second differential signal output pin of the isolation chip through a fifth resistor and is grounded to the output end of the isolation chip through a seventh resistor; the output end of the ground isolation chip is connected with a second voltage detection signal input pin of the controller through an eighth resistor.
In the fault detection circuit, the power supply pin of the input end of the isolation chip is connected with the positive electrode of the first auxiliary power supply, and the ground pin of the input end of the isolation chip is connected with the negative electrode of the first auxiliary power supply. The power supply pin of the output end of the isolation chip is connected with the positive electrode of the second auxiliary power supply, and the grounding pin 2 of the output end of the isolation chip is connected with the negative electrode of the second auxiliary power supply.
The fault detection circuit comprises a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor and a controller, wherein the first capacitor is connected between a first differential signal input pin of the isolation chip and a grounding pin of the input end of the isolation chip, the second capacitor is connected between a power supply pin of the input end of the isolation chip and the grounding pin of the input end of the isolation chip, the third capacitor is connected between a positive electrode of the second auxiliary power supply and a negative electrode of the second auxiliary power supply, the fourth capacitor is connected between the first differential signal output pin of the isolation chip and the grounding pin of the output end of the isolation chip, and the fifth capacitor is connected between the second voltage detection signal input pin of the controller and the ground.
The fault detection circuit can rapidly detect the fault of the fuse, and the charging pile cuts off the direct current output, so that the personal safety is prevented from being endangered by misoperation.
[ Description of the drawings ]
The utility model will be described in further detail with reference to the drawings and the detailed description.
Fig. 1 is a schematic diagram of a dc charging control steering circuit and control scheme for a prior art charging pile.
Fig. 2 is a schematic diagram of a dc charging control guiding circuit and control scheme of a charging pile according to an embodiment of the present utility model.
FIG. 3 is a schematic diagram of sampling locations of a fault detection circuit according to an embodiment of the present utility model.
Fig. 4 is a circuit diagram of a first voltage detection circuit of the present utility model.
Fig. 5 is a circuit diagram of a second voltage detection circuit according to an embodiment of the utility model.
Fig. 6 is a circuit diagram of a current detection circuit according to an embodiment of the present utility model.
Detailed description of the preferred embodiments
The direct current charging control guiding circuit of the charging pile in the embodiment of the utility model shown in fig. 2 is added with a fault detection circuit of the direct current output FUSE of the charging pile on the basis of the direct current charging control guiding circuit provided by annex B.1 of national standard GB/T18487.1-2015 shown in fig. 1.
The fault detection circuit of the direct current output FUSE FUSE of the charging pile comprises an AC/DC module, a direct current power supply loop contactor and a control circuit, wherein the direct current output FUSE FUSE is connected in series in a direct current positive bus between a positive pole V1 of an output end of the AC/DC module of the charging pile and a first contact K1 of the direct current power supply loop contactor, and the fault detection circuit comprises a first voltage detection circuit, a second voltage detection circuit and a current detection circuit. As shown in fig. 3, the sampling point of the first voltage detection circuit is located at the output end of the AC/DC module, that is, the positive electrode V1 of the output end of the AC/DC module and the negative electrode (ground) GND of the output end of the AC/DC module, and samples through the interface J2. The sampling point of the second voltage detection circuit is located at the output end of the contact of the direct current power supply loop, namely the output end V2 of the contact K1 of the direct current power supply loop and the output end GND2 of the contact K2 of the direct current power supply loop, and samples through the interface J1. The current detection circuit comprises a current divider R, wherein the current divider R is connected in series in a direct current positive bus, a first end of the current divider R is connected with an anode V1 of an output end of the AC/DC module, and a second end V3 of the current divider R is connected with a direct current output FUSE. The sampling points of the current detection circuit are the positive electrode V1 of the output end of the AC/DC module and the second end V3 of the shunt R, and sampling is carried out through pins V1 and V3. The output end of the first voltage detection circuit, the output end of the second voltage detection circuit and the output end of the current detection circuit are respectively connected with a controller of the charging pile control circuit.
As shown in fig. 4, the first voltage detection circuit includes a first subtractor including a first power amplifier SGM8255, where a non-inverting input terminal of the first power amplifier is connected to the positive electrode V1 of the output terminal of the AC/DC module through a thirteenth resistor R13, and is grounded GND through a fifteenth resistor R15. The inverting input end of the first power amplifier is grounded to GND through a fourteenth resistor R14, and is connected to the output end of the first power amplifier through a sixteenth resistor R16. The output end of the first power amplifier is connected with a first voltage detection signal input pin MCU_01 of the controller through a seventeenth resistor R17.
The thirteenth resistor R13 and the fourteenth resistor R13 have the same resistance, i.e., r13=r14, and the fifteenth resistor R15 and the sixteenth resistor R16 have the same resistance, i.e., r15=r16. The signal MCU_01 is obtained through the amplification of a first operational amplifier (R16/R13). MCU_01 is the voltage value captured by the first voltage detection signal input pin of the controller.
The formula for the controller to obtain V1 is as follows:
V1＝(R13/R16)*MCU_01
As shown in fig. 5, the second voltage detection circuit includes an isolation chip U1 and a third subtractor. The model of the isolation chip U1 is NSI1300-DSWVR. The third subtracter comprises a third power amplifier SGM8255B.
The power supply pin VDD1 at the input end of the isolation chip U1 is connected with the positive electrode BAT_5V of the first auxiliary power supply, and the ground pin GND1 at the input end of the isolation chip U1 is connected with the negative electrode BAT_GND of the first auxiliary power supply. The first differential signal input pin INP of the isolation chip U1 is connected with the output end V2 of the first contact of the DC power supply loop contactor through a first resistor R1, and the second differential signal input pin INN is connected with the output end GND1 of the second contact of the DC power supply loop contactor through a second resistor R2; the third resistor R3 is connected between the first differential signal input pin INP of the isolation chip U1 and the ground pin GND1 of the input end of the isolation chip U1, and the ground pin GND1 of the input end of the isolation chip U1 is connected with the second differential signal input pin INN.
The power supply pin VDD2 at the output end of the isolation chip U1 is connected with the positive electrode 5V of the second auxiliary power supply, and the ground pin GND2 at the output end of the isolation chip U1 is connected with the negative electrode GND of the second auxiliary power supply. The non-inverting input end of the third power amplifier is connected with a first differential signal output pin OUTP of the isolation chip U1 through a fourth resistor R4 and is grounded through a sixth resistor R6; the inverting input end of the third power amplifier is connected with a second differential signal output pin OUTN of the isolation chip U1 through a fifth resistor R5, and is grounded to the output end of the isolation chip U1 through a seventh resistor R7; the output end of the ground isolation chip U1 is connected with a second voltage detection signal input pin MCU_02 of the controller through an eighth resistor R8.
The first capacitor C1 is connected between the first differential signal input pin INP of the isolation chip U1 and the ground pin GND1 of the input end of the isolation chip U1, the second capacitor C2 is connected between the power supply pin VDD1 of the input end of the isolation chip U1 and the ground pin GND1 of the input end of the isolation chip U1, the third capacitor C3 is connected between the positive pole 5V of the second auxiliary power supply and the negative pole GND of the second auxiliary power supply, the fourth capacitor C4 is connected between the first differential signal output pin OUTP of the isolation chip U1 and the ground pin GND2 of the output end of the isolation chip U1, and the fifth capacitor C5 is connected between the second voltage detection signal input pin MCU_02 of the controller and the ground pin GND.
The Gain of the isolation chip U1 is Gain, the resistance values of the fourth resistor R4 and the fifth resistor R5 are equal, that is, r4=r5, and the resistance values of the sixth resistor R6 and the seventh resistor R7 are equal, that is, r6=r7. The voltage signal divided by the resistors R1, R2 and R3 is used as the input of the isolation chip U1, the signal is amplified by Gain times by the isolation chip and then used as the input of the third operational amplifier SGM8255B, and the MCU_02 is obtained by the third operational amplifier amplification (R7/R4). MCU_02 is the voltage value captured by the second voltage detection signal input pin of the controller.
The formula for the controller to obtain V2 is as follows:
as shown in fig. 6, the current detection circuit includes a second subtractor, where the second subtractor includes a second power amplifier SGM8255B, and a non-inverting input terminal of the second power amplifier is connected to the positive electrode V1 of the output terminal of the AC/DC module through a ninth resistor R9, and is grounded GND through a tenth resistor R10. The inverting input end of the second power amplifier is connected with the second end V3 of the shunt R through a thirty-first resistor R30, and is connected with the output end of the second power amplifier through an eleventh resistor R11. The output end of the second power amplifier is connected with a current detection signal input pin MCU_03 of the controller through a twelfth resistor R12.
The resistance values of the ninth resistor R9 and the thirty-first resistor R30 are equal, i.e., r9=r30, and the resistance values of the tenth resistor R10 and the eleventh resistor R11 are equal, i.e., r10=r11. The voltage (V3-V1) generated at two ends of the shunt R is used as the input of the second operational amplifier SGM8255B, and the signal MCU_03 is obtained through the amplification (R11/R9) of the second operational amplifier. MCU_03 is the voltage value captured by the current detection circuit signal input pin of the controller.
The formula for the controller to acquire the current I is as follows:
I＝[MCU_03*(R9/R11)]/R
The fault detection circuit state judgment process of the embodiment of the utility model is as follows:
1. normal state:
(1) When the vehicle end feeds back the SOC electric quantity (acquired by message communication between the pile and the vehicle controller) to be less than or equal to 85 percent, when the direct current charging pile is in a normal charging stage, the voltage detection 1 and the voltage detection 2 are continuously detected to have voltage, and the output current is greater than 1.5A, so that the direct current charging pile is indicated to normally operate.
(2) When the vehicle end feedback SOC electric quantity is more than 85%, the direct current charging pile is in a normal charging stage, and voltage detection 1 and voltage detection 2 are continuously detected to have voltage, so that the direct current charging pile can normally operate.
2. Fault state:
(1) When the vehicle end feedback SOC electric quantity is less than or equal to 85%, the direct current charging pile is in a normal charging stage, the voltage of voltage detection 1 is detected continuously for 5 seconds, the voltage of voltage detection 2 is not detected, the output current is less than 1.5A, the duration is 1min, the direct current output fuse is judged to be faulty, the state of the direct current charging pile is jumped to a fault state, and the output is cut off.
(2) When the vehicle end feedback SOC electric quantity is more than 85%, the direct current charging pile is in a normal charging stage, the voltage of voltage detection 1 is continuously detected for 5 seconds, but the voltage of voltage detection 2 is not detected, the direct current output fuse is judged to be in fault, the state of the direct current charging pile is jumped to be in fault, and output is cut off.
Claims (8)
1. The fault detection circuit of the direct current output fuse of the charging pile comprises an AC/DC module, a direct current power supply loop contactor and a control circuit, wherein the direct current output fuse is connected in series in a direct current bus between the output end of the AC/DC module of the charging pile and the contact point of the direct current power supply loop contactor; the output end of the first voltage detection circuit, the output end of the second voltage detection circuit and the output end of the current detection circuit are respectively connected with a controller of the charging pile control circuit.
2. The fault detection circuit of claim 1, wherein the first voltage detection circuit comprises a first subtractor having a first input coupled to the positive pole of the AC/DC block output and a second input coupled to the ground, and an output coupled to the controller.
3. The fault detection circuit of claim 2, wherein the first subtractor comprises a first power amplifier having a non-inverting input coupled to the positive pole of the output of the AC/DC module through a thirteenth resistor and coupled to ground through a fifteenth resistor; the inverting input end of the first power amplifier is grounded through a fourteenth resistor and is connected with the output end of the first power amplifier through a sixteenth resistor; the output end of the first power amplifier is connected with the controller through a seventeenth resistor.
4. The fault detection circuit of claim 1, wherein the current detection circuit comprises a shunt and a second subtractor, the shunt is connected in series in the direct current positive bus, the first end of the shunt is connected with the positive electrode of the output end of the AC/DC module, and the second end of the shunt is connected with the direct current output fuse; the first input end of the second subtracter is connected with the positive electrode of the output end of the AC/DC module, the second input end of the second subtracter is connected with the second end of the shunt, and the output end of the second subtracter is connected with the controller.
5. The fault detection circuit of claim 4, wherein the second subtractor comprises a second power amplifier, the non-inverting input of the second power amplifier being connected to the positive electrode of the output of the AC/DC module through a ninth resistor and to ground through a tenth resistor; the inverting input end of the second power amplifier is connected with the second end of the shunt through a thirty-first resistor and is connected with the output end of the second power amplifier through an eleventh resistor; the output end of the second power amplifier is connected with the controller through a twelfth resistor.
6. The fault detection circuit of claim 1, wherein the second voltage detection circuit comprises an isolation chip and a third subtractor, the third subtractor comprising a third power amplifier; the first differential signal input pin of the isolation chip is connected with the output end of the first contact of the direct current power supply loop contactor through a first resistor, and the second differential signal input pin is connected with the output end of the second contact of the direct current power supply loop contactor through a second resistor; the third resistor is connected between the first differential signal input pin of the isolation chip and the grounding pin of the input end of the isolation chip, and the grounding pin of the input end of the isolation chip is connected with the second differential signal input pin; the non-inverting input end of the third power amplifier is connected with a first differential signal output pin of the isolation chip through a fourth resistor and grounded through a sixth resistor; the inverting input end of the third power amplifier is connected with the second differential signal output pin of the isolation chip through a fifth resistor and is grounded to the output end of the isolation chip through a seventh resistor; the output end of the ground isolation chip is connected with a second voltage detection signal input pin of the controller through an eighth resistor.
7. The fault detection circuit of claim 6, wherein the power pin of the input end of the isolation chip is connected to the positive pole of the first auxiliary power supply, the ground pin of the input end of the isolation chip is connected to the negative pole of the first auxiliary power supply, the power pin of the output end of the isolation chip is connected to the positive pole of the second auxiliary power supply, and the ground pin 2 of the output end of the isolation chip is connected to the negative pole of the second auxiliary power supply.
8. The fault detection circuit of claim 7, wherein the first capacitor is connected between the first differential signal input pin of the isolation chip and the ground pin of the input terminal of the isolation chip, the second capacitor is connected between the power supply pin of the input terminal of the isolation chip and the ground pin of the input terminal of the isolation chip, the third capacitor is connected between the positive pole of the second auxiliary power supply and the negative pole of the second auxiliary power supply, the fourth capacitor is connected between the first differential signal output pin of the isolation chip and the ground pin of the output terminal of the isolation chip, and the fifth capacitor is connected between the second voltage detection signal input pin of the controller and ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322111111.7U CN220983440U (en) | 2023-08-08 | 2023-08-08 | Fault detection circuit of charging pile direct current output fuse |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322111111.7U CN220983440U (en) | 2023-08-08 | 2023-08-08 | Fault detection circuit of charging pile direct current output fuse |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220983440U true CN220983440U (en) | 2024-05-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322111111.7U Active CN220983440U (en) | 2023-08-08 | 2023-08-08 | Fault detection circuit of charging pile direct current output fuse |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220983440U (en) |
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2023
- 2023-08-08 CN CN202322111111.7U patent/CN220983440U/en active Active
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