CN111469702A - Grounding detection circuit and method for alternating current controller of charging pile - Google Patents
Grounding detection circuit and method for alternating current controller of charging pile Download PDFInfo
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- CN111469702A CN111469702A CN202010255140.9A CN202010255140A CN111469702A CN 111469702 A CN111469702 A CN 111469702A CN 202010255140 A CN202010255140 A CN 202010255140A CN 111469702 A CN111469702 A CN 111469702A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/60—Monitoring or controlling charging stations
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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
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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
- 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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- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The application relates to a charging pile alternating current controller grounding detection circuit and a method, wherein the circuit comprises: the current limiting module is connected between the grounding end of the charging pile alternating-current controller and the ground in series and used for receiving an alternating-current signal output by the grounding end of the charging pile alternating-current controller and generating a current reducing signal according to the alternating-current signal; the optical coupling isolation module is connected in series in a grounding loop of the current limiting module and used for receiving the current reduction signal and generating an optical coupling isolation signal according to the current reduction signal; and the judging module is connected with the output end of the optical coupling isolation module and used for receiving the optical coupling isolation signal and judging whether the charging pile alternating-current controller has a ground break fault or not according to the optical coupling isolation signal. This application can detect out in time and fill electric pile AC controller's ground connection open circuit trouble, avoids taking place because of the personal and the property safety's of the endangering user that this trouble leads to the condition, has improved the security that fills electric pile work.
Description
Technical Field
The invention relates to the technical field of charging piles, in particular to a grounding detection circuit and method for an alternating current controller of a charging pile.
Background
With the rapid development of electric vehicle technology, various charging piles appear in people's daily life, and the development of the charging pile technology becomes one of the key influencing factors that restrict the development of electric vehicle technology. In order to improve the efficiency of charging for electric vehicle by the charging pile, the charging pile generally works in the environment of high voltage and large current, the charging pile AC controller is used as a control center of the charging pile, and the safety and stability of the work of the AC controller directly influence the safety and stability of the power supply of the charging pile.
However, the grounding circuit of the conventional electric vehicle charging pile ac controller lacks a detection and protection circuit, the charging pile generally works in an outdoor environment, and is affected by a working environment, and the grounding circuit of the ac controller is likely to have an open circuit fault, so that the charging pile ac controller cannot be effectively grounded, the charging pile may work abnormally or even cannot work, and personal and property safety of a user may be endangered.
Disclosure of Invention
In view of the above, it is necessary to provide a charging pile ac controller ground fault detection circuit and method capable of detecting a ground fault of a charging pile ac controller in view of the above problems in the background art.
An aspect of this application provides a fill electric pile AC controller ground connection detection circuitry, establishes ties in the ground return circuit who fills electric pile AC controller for detect fill electric pile AC controller's ground connection open circuit trouble, the circuit includes:
the current limiting module is connected between the grounding end of the charging pile alternating-current controller and the ground in series and used for receiving an alternating-current signal output by the grounding end of the charging pile alternating-current controller and generating a current reducing signal according to the alternating-current signal;
the optical coupling isolation module is connected in series in a grounding loop of the current limiting module and used for receiving the current reduction signal and generating an optical coupling isolation signal according to the current reduction signal;
and the judging module is connected with the output end of the optical coupling isolation module and used for receiving the optical coupling isolation signal and judging whether the charging pile alternating-current controller has a ground break fault or not according to the optical coupling isolation signal.
In the grounding detection circuit of the charging pile alternating-current controller in the above embodiment, the current limiting module is arranged to be connected in series between the grounding end of the charging pile alternating-current controller and the ground, and is configured to receive an alternating-current signal output by the grounding end of the charging pile alternating-current controller and generate a current reducing signal according to the alternating-current signal; an optical coupling isolation module is arranged in series in a grounding loop of the current limiting module and used for receiving the current reducing signal and generating an optical coupling isolation signal according to the current reducing signal; the setting judgment module is connected with the output end of the optical coupling isolation module and used for receiving the optical coupling isolation signal and judging whether the charging pile alternating-current controller has a ground break fault or not according to the optical coupling isolation signal. Because the alternating current signal output by the grounding end of the charging pile alternating current controller flows to the ground after sequentially passing through the current limiting module and the light emitting diode of the optical coupling isolation module, the triode of the optical coupling isolation module is conducted when the light emitting diode of the optical coupling isolation module is electrified to emit light, however, when the grounding loop of the charging pile AC controller has an open circuit fault, the light emitting diode of the optical coupling isolation module is cut off and does not emit light, so that the triode of the optical coupling isolation module is in a cut-off state, the judging module can judge whether the ground circuit of the charging pile AC controller breaks down or not based on the on-off state of the triode of the optocoupler isolation module, so that the situation that the personal and property safety of a user is endangered due to the fact that the charging pile AC controller cannot be effectively grounded is avoided, and the safety and the reliability of the charging pile work are improved.
In one embodiment, the charging pile ac controller ground fault detection circuit further includes a protection circuit, and the protection circuit is connected in series in a ground loop of the optical coupling isolation module and is used for protecting the optical coupling isolation module. Fill electric pile AC controller's earthing terminal output's alternating current signal can the periodic pulse signal of opto-coupler isolation module output, the structural feature of opto-coupler isolation module self leads to its influence that receives external environment very easily to when emitting diode in the opto-coupler isolation module can not normally work, can lead to the output signal of opto-coupler isolation module unusual, make the judgement module can not judge effectively whether there is the fault that opens circuit in electric pile AC controller's ground circuit based on the opto-coupler isolation signal of opto-coupler isolation module output. The protection circuit is arranged in series in the ground loop of the optical coupling isolation module and used for protecting the optical coupling isolation module, so that the condition that the optical coupling isolation module cannot normally work and the judgment module misjudges can be effectively reduced.
In one embodiment, the protection circuit comprises a diode D1, the anode of the diode D1 is connected with the cathode of the light emitting diode of the optical coupling isolation module, and the cathode of the diode D1 is grounded.
In the grounding detection circuit of the charging pile alternating-current controller in the embodiment, the anode of the diode D1 is connected with the cathode of the light-emitting diode of the optical coupling isolation module, and the cathode of the diode D1 is grounded, so that the situation that the light-emitting diode of the optical coupling isolation module is broken down due to the fact that alternating current output by the grounding end of the charging pile alternating-current controller is large is avoided, and the working stability and reliability of the optical coupling isolation module are improved.
In one embodiment, the current limiting module includes:
the switching unit is connected between the grounding end of the charging pile alternating-current controller and the current limiting module in series;
the switch protection unit is connected in series in a power supply loop of the switch unit and used for protecting the switch unit;
and the current limiting resistor is connected between the switch unit and the optical coupling isolation module in series.
In the grounding detection circuit of the charging pile alternating-current controller in the embodiment, the switching unit is arranged and connected in series between the grounding end of the charging pile alternating-current controller and the current limiting module; a switch protection unit is arranged in series in a power supply loop of the switch unit and used for protecting the switch unit; and a current limiting resistor is arranged and connected in series between the switch unit and the optical coupling isolation module. The current-limiting resistor can effectively reduce the drive current signal received by the optical coupling isolation module, and prevent the optical coupling isolation module from damaging a light-emitting diode therein or reducing the service life of the optical coupling isolation module due to overlarge drive current. Can break off through the disconnection switch unit fill electric pile AC controller's earthing terminal with the opto-coupler isolation module's is connected, is convenient for install and maintain electric pile AC controller ground connection detection circuitry, has improved the practicality and the security of using that fill electric pile AC controller ground connection detection circuitry.
In one embodiment, the switch unit comprises a relay, a coil of the relay is connected with the output end of the first direct current power supply, a movable contact of the relay is connected with the input end of the optical coupling isolation module, and the coil of the relay is electrified to close the relay so as to connect the current-limiting resistor with the grounding end of the charging pile alternating current controller.
In one embodiment, the switch protection unit comprises a diode D2, an anode of the diode D2 is connected with an output terminal of the coil of the relay, and a cathode of the diode D2 is connected with an input terminal of the coil of the relay.
In the grounding detection circuit of the charging pile alternating-current controller in the embodiment, the anode of the diode D2 is connected with the output end of the coil of the relay, and the cathode of the diode D2 is connected with the input end of the coil of the relay, so that the phenomenon that the coil of the relay is burnt by an alternating-current signal output by the grounding end of the charging pile alternating-current controller in the reverse direction is avoided, and the working stability and reliability of the current limiting module are improved.
In one embodiment, the determining module includes:
one end of the shunt resistor is connected with a collector electrode of a triode of the optical coupling isolation module, and the other end of the shunt resistor is connected with an output end of a second direct current power supply;
one end of the divider resistor is connected with a collector of a triode of the optical coupling isolation module;
and the microcontroller is connected with the other end of the divider resistor and used for receiving the optical coupling isolation signal and judging that the charging pile alternating current controller has a ground break fault when the duration of a high level signal acquired based on the optical coupling isolation signal is greater than or equal to a preset threshold value.
In the grounding detection circuit of the charging pile alternating-current controller in the above embodiment, one end of a shunt resistor is connected with a collector of a triode of the optocoupler isolation module, and the other end of the shunt resistor is connected with an output end of a second direct-current power supply; one end provided with a divider resistor is connected with the collector electrode of the triode of the optical coupling isolation module; and a microcontroller is arranged to be connected with the other end of the divider resistor and used for receiving the optical coupling isolation signal. The optical coupling isolation module can output periodic pulse signals due to the alternating current signals output by the grounding end of the charging pile alternating current controller, and when the triode of the optical coupling isolation module is conducted, the divider resistor can provide low-level signals for the microcontroller; when the grounding circuit of the charging pile AC controller breaks down, the light-emitting diode of the optical coupling isolation module is cut off and does not emit light, so that the triode of the optical coupling isolation module is in a cut-off state, a second DC power supply is connected with the microcontroller through a shunt resistor and a divider resistor in sequence and provides a high level signal for the microcontroller, and the microcontroller judges that the charging pile AC controller has the grounding broken-down fault when judging that the duration time of the high level signal is greater than or equal to a preset threshold value.
In one embodiment, the charging pile ac controller ground fault detection circuit further comprises an alarm module, wherein the alarm module is connected with the microcontroller and is used for controlling and alarming based on the microcontroller when the microcontroller judges that the charging pile ac controller has a ground fault.
In the grounding detection circuit of the charging pile AC controller in the embodiment, an alarm module is arranged to be connected with the microcontroller, and the microcontroller can be configured to send an alarm signal to the alarm module when judging that the grounding open circuit fault exists in the charging pile AC controller, so as to control the alarm module to alarm and remind related workers to take related measures in time, and personal and/or property damage caused by the open circuit of a grounding loop of the charging pile AC controller is avoided.
In one embodiment, the optical coupling isolation module comprises a buffer capacitor, one end of the buffer capacitor is connected with a collector of a triode of the optical coupling isolation module, and the other end of the buffer capacitor is grounded.
In the ground detection circuit of the alternating current controller of the charging pile in the embodiment, one end of the buffer capacitor is connected with the collector of the triode of the optical coupling isolation module, and the other end of the buffer capacitor is grounded, so that the buffer capacitor is charged when the light emitting diode of the optical coupling isolation module is switched on, the buffer capacitor is used for discharging when the light emitting diode is switched off, and the impact influence caused by sudden generation or disappearance of the driving current on the light emitting diode can be effectively avoided due to the fact that the electric quantity of the buffer capacitor is exhausted for a certain time.
Another aspect of the application provides a method for detecting grounding of a charging pile alternating-current controller, wherein an alternating-current signal output by a grounding end of the charging pile alternating-current controller is received based on a current limiting module, and a current reducing signal is generated according to the alternating-current signal;
generating an optical coupling isolation signal by the optical coupling isolation module according to the received current reduction signal;
and judging whether the charging pile AC controller has a ground break fault or not by the judging module according to the received optical coupling isolation signal.
In the grounding detection method of the charging pile alternating-current controller in the embodiment, the current limiting module is used for receiving an alternating-current signal output by a grounding end of the charging pile alternating-current controller and generating a current reduction signal according to the alternating-current signal; receiving the current reduction signal based on an optical coupling isolation module and generating an optical coupling isolation signal according to the current reduction signal; and receiving the optical coupling isolation signal based on a judgment module and judging whether the charging pile alternating current controller has a ground break fault according to the optical coupling isolation signal. Because the alternating current signal output by the grounding end of the charging pile alternating current controller flows to the ground after sequentially passing through the current limiting module and the light emitting diode of the optical coupling isolation module, the triode of the optical coupling isolation module is conducted when the light emitting diode of the optical coupling isolation module is electrified to emit light, however, when the grounding loop of the charging pile AC controller has an open circuit fault, the light emitting diode of the optical coupling isolation module is cut off and does not emit light, so that the triode of the optical coupling isolation module is in a cut-off state, the judging module can judge whether the ground circuit of the charging pile AC controller breaks down or not based on the on-off state of the triode of the optocoupler isolation module, so that the situation that the personal and property safety of a user is endangered due to the fact that the charging pile AC controller cannot be effectively grounded is avoided, and the safety and the reliability of the charging pile work are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain drawings of other embodiments based on these drawings without any creative effort.
Fig. 1 is a schematic diagram of a grounding detection circuit of an ac charging pile ac controller according to a first embodiment of the present disclosure.
Fig. 2 is a schematic diagram of a grounding detection circuit of an ac charging pile ac controller according to a second embodiment of the present application.
Fig. 3 is a schematic diagram of a grounding detection circuit of an ac charging pile ac controller according to a third embodiment of the present application.
Fig. 4 is a schematic circuit diagram of a charging pile ac controller ground fault detection circuit provided in a fourth embodiment of the present application.
Fig. 5 is a flowchart of a grounding detection method for an ac charging pile ac controller according to a fifth embodiment of the present application.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Where the terms "comprising," "having," and "including" are used herein, another element may be added unless an explicit limitation is used, such as "only," "consisting of … …," etc. Unless mentioned to the contrary, terms in the singular may include the plural and are not to be construed as being one in number.
It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present application.
In this application, unless otherwise expressly stated or limited, the terms "connected" and "connecting" are used broadly and encompass, for example, direct connection, indirect connection via an intermediary, communication between two elements, or interaction between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In a charging pile ac controller ground fault detection circuit 100 provided in an embodiment of the present application, as shown in fig. 1, the charging pile ac controller ground fault detection circuit includes a current limiting module 10, an optical coupling isolation module 20, and a determination module 30. The current limiting module 10 is connected in series between the ground terminal of the charging pile ac controller 200 and the ground, and is configured to receive an ac signal output by the ground terminal of the charging pile ac controller 200 and generate a current reduction signal according to the ac signal; the optical coupling isolation module 20 is connected in series in a ground loop of the current limiting module 10, and is configured to receive the current reduction signal and generate an optical coupling isolation signal according to the current reduction signal; the judging module 30 is connected with the output end of the optical coupling isolation module 20, and is configured to receive the optical coupling isolation signal and judge whether the charging pile ac controller 200 has a ground fault according to the optical coupling isolation signal.
Specifically, in the grounding detection circuit of the charging pile ac controller in the above embodiment, the current limiting module 10 is arranged to be connected in series between the grounding end of the charging pile ac controller 200 and the ground, and is configured to receive an ac signal output by the grounding end of the charging pile ac controller 200 and generate a current reducing signal according to the ac signal; the optical coupling isolation module 20 is arranged in series in a grounding loop of the current limiting module 10 and used for receiving the current reduction signal and generating an optical coupling isolation signal according to the current reduction signal; the setting judgment module 30 is connected with the output end of the optical coupling isolation module 20 and used for receiving the optical coupling isolation signal and judging whether the charging pile alternating current controller 200 has a ground break fault according to the optical coupling isolation signal. Because the ac signal output from the ground terminal of the charging pile ac controller 200 sequentially passes through the current limiting module 10 and the light emitting diode of the opto-coupler isolation module 20 and then flows to the ground, the triode of the opto-coupler isolation module 20 is turned on when the light emitting diode of the opto-coupler isolation module 20 is powered on and emits light, however, when the ground circuit of the charging pile ac controller 200 has an open circuit fault, the light emitting diode of the opto-coupler isolation module 200 is turned off and does not emit light, make opto-coupler isolation module 20's triode be in the off-state, judge module 30 can be based on the on-off state of opto-coupler isolation module's triode judges whether fill electric pile AC controller 200's ground return circuit and break the circuit trouble, avoid taking place because of filling the circumstances that electric pile AC controller 200 can not effectively ground lead to endangering user's personal and property safety, improved the security and the reliability of filling electric pile work.
Further, in a charging pile ac controller ground fault detection circuit 100 provided in an embodiment of the present application, as shown in fig. 2, the charging pile ac controller ground fault detection circuit further includes a protection circuit 40, and the protection circuit 40 is connected in series in a ground loop of the opto-isolator module 20, and is used for protecting the opto-isolator module 20.
Specifically, in the electric pile ac controller ground connection detection circuitry that fills in above-mentioned embodiment, the alternating current signal of electric pile ac controller 200's earthing terminal output can make opto-coupler isolation module 20 output periodic pulse signal, the structural feature of opto-coupler isolation module 20 self leads to opto-coupler isolation module 20 to receive external environment's influence very easily, and when emitting diode in opto-coupler isolation module 20 can not normally work, can lead to opto-coupler isolation module's output signal unusual, make judge module 30 can not judge effectively based on the opto-coupler isolation signal of opto-coupler isolation module 20 output whether there is the fault of opening circuit in the ground circuit who fills electric pile ac controller 200. The protection circuit 40 is arranged in series in the ground loop of the optical coupling isolation module 20 and used for protecting the optical coupling isolation module 20, so that the condition of module misjudgment caused by the fact that the optical coupling isolation module cannot work normally can be effectively reduced.
Further, in a charging pile ac controller ground fault detection circuit 100 provided in an embodiment of the present application, as shown in fig. 3, a current limiting module 10 includes a switching unit 11, a switching protection unit 12, and a current limiting resistor 13. The switching unit 11 is connected in series between the ground terminal of the charging pile ac controller 200 and the opto-coupler isolation module 20; the switch protection unit 12 is connected in series in the power supply loop of the switch unit 11 and is used for protecting the switch unit 10; the current limiting resistor 13 is connected in series between the switch unit 11 and the optical coupling isolation module.
In the grounding detection circuit of the charging pile ac controller in the above embodiment, as shown in fig. 3, the switch unit 11 is arranged in series between the grounding end of the charging pile ac controller 200 and the optical coupling isolation module 20; the switch protection unit 12 is arranged in series in a power supply loop of the switch unit 11 and used for protecting the switch unit 11; a current limiting resistor 13 is arranged in series between the switching unit 11 and the opto-isolator module 20. The current limiting resistor 13 can effectively reduce the driving current signal received by the optical coupling isolation module 20, and prevent the optical coupling isolation module 20 from damaging the light emitting diode therein or reducing the service life of the optical coupling isolation module 20 due to overlarge driving current. Can break off through disconnect switch unit 11 and fill electric pile AC controller 200's earthing terminal and opto-coupler isolation module 20's being connected, be convenient for install and maintain electric pile AC controller ground connection detection circuitry 100 filling, improved the practicality and the security of using that fill electric pile AC controller ground connection detection circuitry.
Further, in a charging pile ac controller ground detection circuit 100 provided in an embodiment of the present application, as shown in fig. 4, the switch unit 11 may be configured to include a relay R L1, a coil of the relay R L1 is connected to an output terminal of the first dc power supply VDD1, a movable contact of the relay R L1 is connected to an input terminal of the opto-isolator module 20, and the coil of the relay R L1 is energized to close the relay R L1 to connect the current-limiting resistor 13 to a ground terminal of the charging pile ac controller.
Further, in the grounding detection circuit 100 of the charging pile ac controller in the above embodiment, as shown in fig. 4, the switch protection unit 12 includes a diode D2, an anode of the diode D2 is connected to an output terminal of the coil of the relay R L1, and a cathode of the diode D2 is connected to an input terminal of the coil of the relay R L1, by setting an anode of the diode D2 to be connected to an output terminal of the coil of the relay R L1, and setting a cathode of the diode D2 to be connected to an input terminal of the coil of the relay R L1, an ac signal output from a ground terminal of the charging pile ac controller is prevented from reversely burning the coil of the current limiting relay, and the stability and reliability of the operation of the current limiting module are improved.
Further, in the charging pile ac controller ground fault detection circuit 100 in the above embodiment, as shown in fig. 4, the current limiting resistor 13 is connected in series between the switch unit 11 and the opto-isolator module 20, and the current limiting resistor 13 includes a resistor R1, a resistor R2, a resistor R3 and a resistor R4 which are connected in series.
Further, in the charging pile ac controller ground fault detection circuit 100 in the above embodiment, as shown in fig. 4, the protection circuit 40 includes a diode D1, an anode of the diode D1 is connected to a cathode of a light emitting diode of the opto-coupler isolation module 20, and a cathode of the diode D1 is grounded, in this embodiment, the type of the opto-coupler isolation module 20 may be E L817S 1.
In the grounding detection circuit of the charging pile ac controller in the above embodiment, by setting the anode of the diode D1 to be connected with the cathode of the light emitting diode D3 of the opto-coupler isolation module, and grounding the cathode of the diode D1, the situation that the light emitting diode D3 of the opto-coupler isolation module 20 is broken down due to the fact that the alternating current output by the grounding end of the charging pile ac controller is large is avoided, and the working stability and reliability of the opto-coupler isolation module are improved.
Further, in the charging pile ac controller ground fault detection circuit 100 in the above embodiment, as shown in fig. 4, the determining module 30 includes a voltage dividing resistor R5 and a current dividing resistor R6. One end of a shunt resistor R6 is connected with the collector of a triode Q2 of the optocoupler isolation module 20, and the other end of the shunt resistor R6 is connected with the output end of a second direct-current power supply VDD 2; one end of the divider resistor R5 is connected with the collector of the triode Q2 of the optical coupling isolation module 20; and a microcontroller (not shown in fig. 4) is connected with the output end of the voltage dividing resistor R5 and is used for receiving the optical coupling isolation signal and judging that the charging pile alternating current controller has an earth break fault when the duration of a high level signal acquired based on the optical coupling isolation signal is greater than or equal to a preset threshold value.
Specifically, in the charging pile ac controller ground fault detection circuit 100 in the above embodiment, as shown in fig. 4, one end of a shunt resistor R6 is connected to the collector of the transistor Q2 of the opto-isolator module 20, and the other end of the shunt resistor R6 is connected to the output end of the second dc power supply VDD 2; one end of the divider resistor R5 is connected with the collector of the transistor Q2 of the optical coupling isolation module 20; a microcontroller (not shown in fig. 4) is provided connected to the output of the voltage divider resistor R5 for receiving the optically coupled isolation signal. Because the ac signal Ui output by the ground terminal of the charging pile ac controller enables the opto-isolator module 20 to output a periodic pulse signal, when the transistor Q2 of the opto-isolator module 20 is turned on, the divider resistor R5 provides a low level signal to the microcontroller; when the ground circuit of the charging pile AC controller breaks down, the light emitting diode D3 of the optical coupling isolation module is cut off and does not emit light, so that the triode Q2 of the optical coupling isolation module 20 is in a cut-off state, a second DC power supply VDD2 is connected with the microcontroller through a shunt resistor R6 and a divider resistor R5 in sequence and provides a high-level signal to the microcontroller, and the microcontroller judges that the charging pile AC controller breaks down when judging that the duration time of the high-level signal is greater than or equal to a preset threshold value.
Further, in the grounding detection circuit 100 of the charging pile ac controller in the above embodiment, as shown in fig. 4, the optical coupling isolation module 20 includes a buffer capacitor C1, one end of the buffer capacitor C1 is connected to the collector of the transistor Q2 of the optical coupling isolation module 20, and the other end of the buffer capacitor C1 is grounded.
Specifically, in the grounding detection circuit 100 of the charging pile ac controller in the above embodiment, as shown in fig. 4, one end of the buffering capacitor C1 is connected to the collector of the transistor Q2 of the opto-isolator module 20, and the other end of the buffering capacitor C1 is grounded, so that the buffering capacitor C1 charges when the light emitting diode D3 of the opto-isolator module 20 is turned on, and the buffering capacitor C1 discharges when the light emitting diode D3 is turned off, and since the electric quantity of the buffering capacitor C1 is consumed for a certain time, the impact influence of the light emitting diode D3 caused by sudden generation or disappearance of the driving current can be effectively avoided.
Further, in a grounding detection circuit for an ac charging pile controller provided in an embodiment of the present application, the grounding detection circuit for the ac charging pile controller further includes an alarm module (not shown), connected to the microcontroller, for alarming based on the control of the microcontroller when the microcontroller determines that there is an earth break fault in the ac charging pile controller.
Specifically, in the grounding detection circuit of the charging pile ac controller in the above embodiment, an alarm module is provided to be connected to the microcontroller, and the microcontroller may be configured to send an alarm signal to the alarm module when determining that the grounding open-circuit fault exists in the charging pile ac controller, so as to control the alarm module to alarm, so as to remind relevant workers to take relevant measures in time, thereby avoiding personal and/or property damage caused by the open circuit of the grounding loop of the charging pile ac controller.
Specifically, in the grounding detection circuit of the charging pile ac controller in the above embodiment, the microcontroller may adopt at least one of a single chip microcomputer, an ARM, a DSP, and the like, for example, a 51-series single chip microcomputer.
In an embodiment of the present application, there is provided a charging pile ac controller ground fault detection method based on the charging pile ac controller ground fault detection circuit described in any embodiment of the present application, the method including:
step 202: receiving an alternating current signal output by a grounding end of the charging pile alternating current controller based on the current limiting module and generating a current reducing signal according to the alternating current signal;
step 204: generating an optical coupling isolation signal by the optical coupling isolation module according to the received current reduction signal;
step 206: and judging whether the charging pile AC controller has a ground break fault or not by the judging module according to the received optical coupling isolation signal.
Specifically, in the grounding detection method for the charging pile ac controller in the above embodiment, the current limiting module is used to receive an ac signal output by the grounding terminal of the charging pile ac controller and generate a current reducing signal according to the ac signal; receiving the current reduction signal based on an optical coupling isolation module and generating an optical coupling isolation signal according to the current reduction signal; and receiving the optical coupling isolation signal based on a judgment module and judging whether the charging pile alternating current controller has a ground break fault according to the optical coupling isolation signal. Because the alternating current signal output by the grounding end of the charging pile alternating current controller flows to the ground after sequentially passing through the current limiting module and the light emitting diode of the optical coupling isolation module, the triode of the optical coupling isolation module is conducted when the light emitting diode of the optical coupling isolation module is electrified to emit light, however, when the grounding loop of the charging pile AC controller has an open circuit fault, the light emitting diode of the optical coupling isolation module is cut off and does not emit light, so that the triode of the optical coupling isolation module is in a cut-off state, the judging module can judge whether the ground circuit of the charging pile AC controller breaks down or not based on the on-off state of the triode of the optocoupler isolation module, so that the situation that the personal and property safety of a user is endangered due to the fact that the charging pile AC controller cannot be effectively grounded is avoided, and the safety and the reliability of the charging pile work are improved.
For specific limitations of the grounding detection method for the charging pile ac controller in the above embodiments, reference may be made to the above limitations on the grounding detection circuit for the charging pile ac controller, and details are not repeated here.
It should be understood that, although the steps in the flowchart of fig. 5 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 5 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A fill electric pile AC controller ground connection detection circuit, characterized by, establish ties in filling electric pile AC controller's ground return circuit for detect fill electric pile AC controller's earthing and breaking fault, the circuit includes:
the current limiting module is connected between the grounding end of the charging pile alternating-current controller and the ground in series and used for receiving an alternating-current signal output by the grounding end of the charging pile alternating-current controller and generating a current reducing signal according to the alternating-current signal;
the optical coupling isolation module is connected in series in a grounding loop of the current limiting module and used for receiving the current reduction signal and generating an optical coupling isolation signal according to the current reduction signal;
and the judging module is connected with the output end of the optical coupling isolation module and used for receiving the optical coupling isolation signal and judging whether the charging pile alternating-current controller has a ground break fault or not according to the optical coupling isolation signal.
2. The charging post ac controller ground fault detection circuit of claim 1, further comprising:
and the protection circuit is connected in series in a ground loop of the optical coupling isolation module and is used for protecting the optical coupling isolation module.
3. The charging post ac controller ground fault detection circuit of claim 2, wherein the protection circuit comprises:
and the anode of the diode D1 is connected with the cathode of a light emitting diode of the optical coupling isolation module, and the cathode of the diode D1 is grounded.
4. The charging post ac controller ground fault detection circuit of claim 1, wherein the current limiting module comprises:
the switching unit is connected between the grounding end of the charging pile alternating-current controller and the current limiting module in series;
the switch protection unit is connected in series in a power supply loop of the switch unit and used for protecting the switch unit;
and the current limiting resistor is connected between the switch unit and the optical coupling isolation module in series.
5. The charging post ac controller ground fault detection circuit of claim 4, wherein the switching unit comprises:
and a coil of the relay is connected with the output end of the first direct-current power supply, a movable contact of the relay is connected with the input end of the optical coupling isolation module, and the coil of the relay is electrified to close the relay so as to connect the current-limiting resistor with the grounding end of the charging pile alternating-current controller.
6. The charging pile ac controller ground fault detection circuit of claim 5, wherein the switch protection unit comprises:
and the anode of the diode D2 is connected with the output end of the coil of the relay, and the cathode of the diode D2 is connected with the input end of the coil of the relay.
7. The charging post ac controller ground fault detection circuit of any of claims 1-6, wherein the determination module comprises:
one end of the shunt resistor is connected with a collector electrode of a triode of the optical coupling isolation module, and the other end of the shunt resistor is connected with an output end of a second direct current power supply;
one end of the divider resistor is connected with a collector of a triode of the optical coupling isolation module;
and the microcontroller is connected with the other end of the divider resistor and used for receiving the optical coupling isolation signal and judging that the charging pile alternating current controller has a ground break fault when the duration of a high level signal acquired based on the optical coupling isolation signal is greater than or equal to a preset threshold value.
8. The charging post ac controller ground fault detection circuit of claim 7, further comprising:
and the alarm module is connected with the microcontroller and used for giving an alarm based on the control of the microcontroller when the microcontroller judges that the charging pile alternating current controller has an earthing break fault.
9. The charging post ac controller ground fault detection circuit of any of claims 1-6, wherein the opto-isolator module comprises:
and one end of the buffer capacitor is connected with the collector of the triode of the optical coupling isolation module, and the other end of the buffer capacitor is grounded.
10. A charging pile ac controller ground fault detection method, based on the charging pile ac controller ground fault detection circuit according to any one of claims 1 to 9, the method comprising:
receiving an alternating current signal output by a grounding end of the charging pile alternating current controller based on the current limiting module and generating a current reducing signal according to the alternating current signal;
generating an optical coupling isolation signal by the optical coupling isolation module according to the received current reduction signal;
and judging whether the charging pile AC controller has a ground break fault or not by the judging module according to the received optical coupling isolation signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010255140.9A CN111469702A (en) | 2020-04-02 | 2020-04-02 | Grounding detection circuit and method for alternating current controller of charging pile |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010255140.9A CN111469702A (en) | 2020-04-02 | 2020-04-02 | Grounding detection circuit and method for alternating current controller of charging pile |
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| CN111469702A true CN111469702A (en) | 2020-07-31 |
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| CN202010255140.9A Pending CN111469702A (en) | 2020-04-02 | 2020-04-02 | Grounding detection circuit and method for alternating current controller of charging pile |
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| CN112611979A (en) * | 2020-12-30 | 2021-04-06 | 国创新能源汽车智慧能源装备创新中心(江苏)有限公司 | Grounding detection circuit and control system |
| CN114527329A (en) * | 2020-11-23 | 2022-05-24 | 汉宇集团股份有限公司 | Fill electric pile ground resistance detection circuitry |
| CN117584788A (en) * | 2023-10-19 | 2024-02-23 | 深圳市斯康达电子有限公司 | A bypass control circuit and equipment for an AC charging pile |
| CN117584788B (en) * | 2023-10-19 | 2025-04-11 | 深圳市斯康达电子有限公司 | A bypass control circuit and device for an AC charging pile |
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Application publication date: 20200731 |