CN219392246U - AC charging pile grounding detection circuit - Google Patents
AC charging pile grounding detection circuit Download PDFInfo
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- CN219392246U CN219392246U CN202223369565.6U CN202223369565U CN219392246U CN 219392246 U CN219392246 U CN 219392246U CN 202223369565 U CN202223369565 U CN 202223369565U CN 219392246 U CN219392246 U CN 219392246U
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- 238000001514 detection method Methods 0.000 title claims abstract description 33
- 239000003990 capacitor Substances 0.000 claims abstract description 39
- 230000007935 neutral effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model discloses an alternating current charging pile grounding detection circuit, which relates to the technical field of alternating current charging pile grounding detection and comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a TVS diode D1, a diode D2, a diode D3, a TVS diode D4, an operational amplifier U1A, an operational amplifier U1B, a capacitor C1, a capacitor C2 and a capacitor C3; the grounding detection is realized, the circuit structure is simple, and the cost is low; the situation that the live wire AC220_L and the zero line AC220_N are reversely connected can be detected, so that the reliability is improved; according to the utility model, the singlechip is used for collecting the voltages of the live wire and the zero wire to the ground respectively, and the sampled voltage is calculated, so that the state of the grounding detection of the charging pile can be judged, the situation of reverse connection of the live wire and the zero wire can be judged, the circuit structure is simple, the cost is low, and the reliability of the system is greatly improved.
Description
Technical Field
The utility model relates to the technical field of AC charging pile grounding detection, in particular to an AC charging pile grounding detection circuit.
Background
With the importance of people on green travel, electric automobiles are becoming more popular, corresponding charging devices such as charging piles and the like are also becoming more and more popular, the charging safety and reliability of the charging devices are also becoming more and more concerned, and the grounding detection technology is a technology for increasing the charging safety and is a necessary safety protection function in alternating-current charging piles.
Because the charging pile works in an outdoor environment for a long time, the ageing resistance of cable rubber and thermoplastic materials is often reduced, even the situation that an insulating layer is peeled off occurs, and the like, if the charging pile cannot be detected and controlled to cut off alternating current output when the charging pile is grounded and suspended, charging safety accidents can be generated, and uncontrollable potential damage to users and vehicles can be caused.
The main defects are as follows: at present, the grounding detection methods of the existing alternating current charging pile control board are quite many, but the problems of low reliability of grounding detection, complex realization, high manufacturing cost, incapability of detecting L, N reverse connection and the like exist.
Disclosure of Invention
The utility model aims to solve the technical problem of providing an alternating current charging pile grounding detection circuit aiming at the defects of the background technology, which realizes grounding detection, has simple circuit structure and low cost, can detect the situation that a live wire AC220_L and a zero line AC220_N are reversely connected, and improves the reliability.
The utility model adopts the following technical scheme for solving the technical problems:
an alternating current charging pile grounding detection circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a TVS diode D1, a diode D2, a diode D3, a TVS diode D4, an operational amplifier U1A, an operational amplifier U1B, a capacitor C1, a capacitor C2 and a capacitor C3;
the live wire AC220_L is connected with one end of a resistor R1, the other end of the resistor R1 is connected with one end of a resistor R2, the other end of the resistor R2 is connected with one end of a resistor R3, the other end of the resistor R3 is connected with one end of a resistor R4, the other end of the resistor R4 is respectively connected with one end of a resistor R6, one end of a TVS diode D1, a cathode of the diode D2 and a positive input end of an operational amplifier U1A, a negative input end of the operational amplifier U1A is respectively connected with one end of a resistor R5 and an output end of the operational amplifier U1A, a positive power end of the operational amplifier U1A is respectively connected with a +5V voltage end and one end of a capacitor C1, the other end of the capacitor C1 is grounded, and the other end of an RC filter R5 is respectively connected with one end of the capacitor C2 and the PE_L_ADC, and the other end of the capacitor C2 is grounded;
zero line AC220_N connects one end of resistance R7, the other end of resistance R7 connects one end of resistance R8, the other end of resistance R8 connects one end of resistance R9, the other end of resistance R9 connects one end of resistance R10, the other end of resistance R10 connects one end of resistance R12, one end of TVS diode D4, the negative pole of diode D3 and the positive input of operational amplifier U1B respectively, the negative input of operational amplifier U1B connects one end of resistance R11 and the output of operational amplifier U1B respectively, the other end of resistance R11 connects one end of capacitor C3 and PE_N_ADC respectively, the other end of capacitor C3 is grounded.
As a further preferable embodiment of the ac charging pile grounding detection circuit according to the present utility model, the resistors R1, R2, R3, and R4 are voltage dividing resistors.
As a further preferable embodiment of the ac charging pile ground detection circuit according to the present utility model, the resistors R7, R8, R9, and R10 are voltage dividing resistors.
As a further preferable mode of the ac charging pile grounding detection circuit of the present utility model, the resistor R6 is a voltage dividing resistor.
As a further preferable mode of the ac charging pile grounding detection circuit of the present utility model, the resistor R12 is a voltage dividing resistor.
As a further preferable mode of the ac charging pile grounding detection circuit of the present utility model, the resistor R5 and the capacitor C2 constitute an RC filter.
As a further preferable mode of the ac charging pile grounding detection circuit of the present utility model, the resistor R11 and the capacitor C3 constitute an RC filter.
Compared with the prior art, the technical scheme provided by the utility model has the following technical effects:
1. the utility model relates to an AC charging pile grounding detection circuit which comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4,
Electric power
Resistor R5, resistor R6, resistor R7, resistor R8, resistor R9, resistor R10, resistor R11, resistor R12, TVS diode D1, diode D2, diode D3, TVS diode D4, operational amplifier U1A, operational amplifier U1B, capacitor C1, capacitor C2, capacitor C3; the grounding detection is realized, the circuit structure is simple, and the cost is low; the situation that the live wire AC220_L and the zero line AC220_N are reversely connected can be detected, so that the reliability is improved;
2. according to the utility model, the singlechip is used for collecting the voltages of the live wire and the zero wire to the ground respectively, and the sampled voltage is calculated, so that the state of the grounding detection of the charging pile can be judged, the situation of reverse connection of the live wire and the zero wire can be judged, the circuit structure is simple, the cost is low, and the reliability of the system is greatly improved.
Drawings
FIG. 1 is a circuit diagram of an AC charging stake ground fault detection circuit according to the present utility model;
FIG. 2 is a waveform of the live and neutral conductors of the present utility model in the normal case of ground connection;
FIG. 3 is a waveform of the live and neutral conductors in the case of a ground fault of the present utility model;
fig. 4 is a reverse waveform of the utility model ground normal live and neutral connections.
Detailed Description
The technical scheme of the utility model is further described in detail below with reference to the accompanying drawings:
the following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
As shown in fig. 1, the ac charging pile grounding detection circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a TVS diode D1, a diode D2, a diode D3, a TVS diode D4, an operational amplifier U1A, an operational amplifier U1B, a capacitor C1, a capacitor C2, and a capacitor C3;
the live wire AC220_L is connected with one end of a resistor R1, the other end of the resistor R1 is connected with one end of a resistor R2, the other end of the resistor R2 is connected with one end of a resistor R3, the other end of the resistor R3 is connected with one end of a resistor R4, the other end of the resistor R4 is respectively connected with one end of a resistor R6, one end of a TVS diode D1, a cathode of the diode D2 and a positive input end of an operational amplifier U1A, a negative input end of the operational amplifier U1A is respectively connected with one end of a resistor R5 and an output end of the operational amplifier U1A, a positive power end of the operational amplifier U1A is respectively connected with a +5V voltage end and one end of a capacitor C1, the other end of the capacitor C1 is grounded, and the other end of an RC filter R5 is respectively connected with one end of the capacitor C2 and the PE_L_ADC, and the other end of the capacitor C2 is grounded;
zero line AC220_N connects one end of resistance R7, the other end of resistance R7 connects one end of resistance R8, the other end of resistance R8 connects one end of resistance R9, the other end of resistance R9 connects one end of resistance R10, the other end of resistance R10 connects one end of resistance R12, one end of TVS diode D4, the negative pole of diode D3 and the positive input of operational amplifier U1B respectively, the negative input of operational amplifier U1B connects one end of resistance R11 and the output of operational amplifier U1B respectively, the other end of resistance R11 connects one end of capacitor C3 and PE_N_ADC respectively, the other end of capacitor C3 is grounded.
Preferably, the resistors R1, R2, R3, and R4 are voltage dividing resistors, the resistors R7, R8, R9, and R10 are voltage dividing resistors, the resistor R6 is a voltage dividing resistor, and the resistor R12 is a voltage dividing resistor.
Preferably, the resistor R5 and the capacitor C2 form an RC filter, and the resistor R11 and the capacitor C3 form an RC filter. .
The live wire AC220_L is connected with one end of D1 after voltage division through a resistor, then the operational amplifier U1 is connected with one end of R5 after following, and the PE_L_ADC after RC filtering is connected with the singlechip. The zero line AC220_N is connected with one end of D4 after voltage division through a resistor, then the operational amplifier U1 is connected with one end of R11 after following, and the PE_N_ADC after RC filtering is connected with the singlechip.
Under the normal grounding condition, the voltage 220V of the live wire AC220_L to the ground PE, the voltage of the zero line AC220_N to the ground PE is smaller and almost 0V, because the operational amplifier is powered by a single power supply and has the function of unidirectional conduction of D2-D3, the PE_L_ADC collected by the singlechip is about 110V after being calculated by a software algorithm, and the PE_N_ADC is 0V, as shown in fig. 2, the test waveform can judge that the grounding is normal. Wherein the 1 channel is a live wire and the 2 channel is a zero line.
Under the condition of grounding broken lines, the live line AC220_L is connected with the ground PE voltage 110V, the zero line AC220_N is connected with the ground PE voltage 110V, and as the operational amplifier is powered by a single power supply and has the function of unidirectional conduction of D2-D3, the PE_L_ADC collected by the singlechip is about 55V after calculation, and the PE_N_ADC is about 55V, as shown in fig. 3, a test waveform can judge that the grounding is abnormal, wherein a 1 channel is the live line, and a 2 channel is the zero line.
Under the conditions that the grounding is normal, the live wire AC220_L and the zero line AC220_N are connected reversely, the voltage of the live wire AC220_L to the ground PE is almost 0V, the voltage of the zero line AC220_N to the ground PE 220V, because the operational amplifier adopts a single power supply to supply power and has the function of unidirectional conduction of D2-D3, the PE_L_ADC collected by the singlechip is about 0V after calculation, and the PE_N_ADC 110V is about 0V, and as shown in fig. 4, the test waveform can judge that the live wire AC220_L and the zero line AC220_N are connected reversely. Wherein the 1 channel is a live wire and the 2 channel is a zero line.
From the above analysis, the ground detection circuit and method can determine the normal ground, the disconnection, the reverse connection of the live AC220_l and the neutral AC 220_n. The circuit has simple structure and low cost, and greatly improves the reliability of the system.
While certain exemplary embodiments of the present utility model have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that modifications may be made to the described embodiments in various different ways without departing from the spirit and scope of the utility model. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive of the scope of the utility model, which is defined by the appended claims.
Claims (7)
1. An ac charging stake ground connection detection circuitry, characterized in that: the resistor comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a TVS diode D1, a diode D2, a diode D3, a TVS diode D4, an operational amplifier U1A, an operational amplifier U1B, a capacitor C1, a capacitor C2 and a capacitor C3;
the live wire AC220_L is connected with one end of a resistor R1, the other end of the resistor R1 is connected with one end of a resistor R2, the other end of the resistor R2 is connected with one end of a resistor R3, the other end of the resistor R3 is connected with one end of a resistor R4, the other end of the resistor R4 is respectively connected with one end of a resistor R6, one end of a TVS diode D1, a cathode of the diode D2 and a positive input end of an operational amplifier U1A, a negative input end of the operational amplifier U1A is respectively connected with one end of a resistor R5 and an output end of the operational amplifier U1A, a positive power end of the operational amplifier U1A is respectively connected with a +5V voltage end and one end of a capacitor C1, the other end of the capacitor C1 is grounded, and the other end of an RC filter R5 is respectively connected with one end of the capacitor C2 and the PE_L_ADC, and the other end of the capacitor C2 is grounded;
zero line AC220_N connects one end of resistance R7, the other end of resistance R7 connects one end of resistance R8, the other end of resistance R8 connects one end of resistance R9, the other end of resistance R9 connects one end of resistance R10, the other end of resistance R10 connects one end of resistance R12, one end of TVS diode D4, the negative pole of diode D3 and the positive input of operational amplifier U1B respectively, the negative input of operational amplifier U1B connects one end of resistance R11 and the output of operational amplifier U1B respectively, the other end of resistance R11 connects one end of capacitor C3 and PE_N_ADC respectively, the other end of capacitor C3 is grounded.
2. The ac charging stake ground fault detection circuit as claimed in claim 1, wherein: the resistor R1, the resistor R2, the resistor R3 and the resistor R4 are voltage dividing resistors.
3. The ac charging stake ground fault detection circuit as claimed in claim 1, wherein: the resistor R7, the resistor R8, the resistor R9 and the resistor R10 are voltage dividing resistors.
4. The ac charging stake ground fault detection circuit as claimed in claim 1, wherein: the resistor R6 is a voltage dividing resistor.
5. The ac charging stake ground fault detection circuit as claimed in claim 1, wherein: the resistor R12 is a voltage dividing resistor.
6. The ac charging stake ground fault detection circuit as claimed in claim 1, wherein: the resistor R5 and the capacitor C2 form an RC filter.
7. The ac charging stake ground fault detection circuit as claimed in claim 1, wherein: the resistor R11 and the capacitor C3 form an RC filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223369565.6U CN219392246U (en) | 2022-12-15 | 2022-12-15 | AC charging pile grounding detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223369565.6U CN219392246U (en) | 2022-12-15 | 2022-12-15 | AC charging pile grounding detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219392246U true CN219392246U (en) | 2023-07-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223369565.6U Active CN219392246U (en) | 2022-12-15 | 2022-12-15 | AC charging pile grounding detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219392246U (en) |
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2022
- 2022-12-15 CN CN202223369565.6U patent/CN219392246U/en active Active
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