CN113900019A - Charging pile relay bonding detection circuit and method - Google Patents

Charging pile relay bonding detection circuit and method Download PDF

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Publication number
CN113900019A
CN113900019A CN202111288702.0A CN202111288702A CN113900019A CN 113900019 A CN113900019 A CN 113900019A CN 202111288702 A CN202111288702 A CN 202111288702A CN 113900019 A CN113900019 A CN 113900019A
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line
relay
isolation
circuit
line relay
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CN202111288702.0A
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CN113900019B (en
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付好名
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Zhejiang Greatway Electrical Tool Co ltd
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Zhejiang Greatway Electrical Tool Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
    • G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
    • 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
    • B60L53/30—Constructional details of charging stations
    • B60L53/31—Charging columns specially adapted for electric vehicles
    • 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
    • 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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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

A charging pile relay bonding detection circuit and a charging pile relay bonding detection method comprise an L-line relay detection circuit, an N-line relay detection circuit, a time delay circuit and an isolation circuit. According to the invention, the N-line relay detection circuit is disconnected with the isolation circuit through the time delay circuit, the L-line relay detection signal is detected through the L-line relay detection circuit to judge whether the L-line relay is bonded or not, when the L-line relay is not bonded, the N-line relay detection circuit is connected with the isolation circuit, and when the N-line relay is judged to be bonded through the N-line relay detection signal, the charging of the charging pile is forbidden. The invention uses a common relay and adopts a time delay circuit, so that whether the relay is bonded or not can be accurately judged by only one isolating circuit. The invention has the advantages of less used devices, low cost, high safety and higher practicability.

Description

Charging pile relay bonding detection circuit and method
Technical Field
The invention belongs to the field of electric automobiles, and particularly relates to a charging pile relay bonding detection circuit and method.
Background
The electric automobile is a new energy automobile, does not use petrochemical energy, can effectively protect atmospheric environment, can conveniently realize electrification and intellectualization, and is a development trend of future automobiles. Electric automobile uses to fill electric pile and mends the electricity to the car, and electric automobile is extremely high to the security requirement of filling electric pile, in case the relay takes place to bond the trouble, must stop rapidly charging.
As shown in fig. 1, the charging pile circuit includes an L-line relay and an N-line relay, and the charging pile controls the opening and closing of the relays. However, when the relay is in a bonding fault, the relay is always communicated, the charging pile cannot control the relay to be disconnected, the output end of the charging pile is always electrified, and potential safety hazards exist. Therefore, whether the relay is bonded or not must be detected, if the position of the bonded relay can be accurately positioned, the charging pile is more intelligent, and meanwhile, the maintenance cost can be reduced.
At present, the detection relay is adhered with the following schemes:
the first scheme is as follows:
this scheme uses and takes supplementary electric shock relay, and relay self has relevant auxiliary contact promptly, and when the relay was in the closure state, relevant signal will be exported to auxiliary contact. When the controller of charging pile controls the relay to be disconnected and the auxiliary contact shows that the relay is in a closed state, the bonding fault of the relay can be judged. Because this kind of scheme has adopted the relay of taking auxiliary contact certainly, so the cost of relay is higher.
Scheme II:
in order to overcome the disadvantage of high cost of the relay in the first scheme, the common relay is used in the first scheme, a set of circuit is designed for each relay, and the state of each relay is respectively detected. Since the relay is bonded to be high voltage and the detection signal is low voltage, an auxiliary related peripheral circuit such as an isolator (e.g., an optocoupler) is generally required. The scheme can detect the bonding of the two relays, but the number of used devices is more, the two isolation devices are included, the cost is higher, and the occupied size of the devices is larger.
The third scheme is as follows:
in order to overcome the disadvantage that devices in the second scheme are more, only one isolating device and one set of circuit are used in the second scheme, but bonding conditions of two relays can only be detected at the same time, and bonding conditions of only one relay cannot be detected. Therefore, the scheme has the advantages of low cost and few devices, but has certain potential safety hazard.
In view of the foregoing, a detection circuit that is low in cost, simple in structure, high in safety and capable of detecting the adhesion of a relay is needed.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a relay adhesion detection circuit, the invention also provides a charging pile with the relay adhesion detection function, and the invention further provides a relay adhesion detection method. In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
one aspect of the present invention provides a charging pile relay adhesion detection circuit for a charging pile of an electric vehicle, the charging pile including a first line relay and a second line relay, the detection circuit including a first line relay detection circuit, a second line relay detection circuit, a time delay circuit and an isolation circuit, wherein:
the first line relay detection circuit is connected with the first line relay, and the second line relay detection circuit is connected with the second line relay; the isolation circuit is respectively connected with the first line relay detection circuit and the second line relay detection circuit; the time delay circuit is connected with the second line relay detection circuit;
in a first time delay, the time delay circuit disconnects the connection between the second line relay detection circuit and the isolation circuit, the first line relay detection circuit sends a first line relay detection signal to the isolation circuit, the isolation circuit outputs a first line isolation signal according to the first line relay detection signal, and the charging pile prohibits charging of the charging pile when the first line relay is judged to be bonded according to the first line isolation signal;
when the first line relay is not bonded, in a second time delay, the time delay circuit connects the second line relay detection circuit with the isolation circuit, the second line relay detection circuit sends a second line relay detection signal to the isolation circuit, the isolation circuit outputs a second line isolation signal according to the second line relay detection signal, and the charging pile prohibits charging of the charging pile when judging that the second line relay is bonded according to the second line isolation signal.
Preferably, the isolation circuit comprises a first switch tube, an isolation optocoupler and a rectification circuit, wherein:
the base electrode of the first switch tube is connected with the first line relay detection circuit, the emitting electrode of the first switch tube is grounded, and the collector electrode of the first switch tube is connected with the primary side of the isolation optocoupler;
the secondary side of the isolation optocoupler is connected with a standard voltage;
the rectification circuit is connected with the secondary side of the isolation optocoupler;
in the first time delay, the isolation circuit isolates and rectifies the detection signal of the first line relay and then outputs the first line isolation signal;
and in the second time delay, the isolating circuit isolates and rectifies the detection signal of the second line relay and then outputs the second line isolation signal.
Preferably, the delay circuit includes a first signal switch tube, and the first signal switch tube is connected to the second wire relay detection circuit;
in the first time delay, the first signal switch tube is switched on, and the second line relay detection circuit is disconnected with the isolation circuit;
and in the second time delay, the first signal switch tube is turned off, and the second line relay detection circuit is connected with the isolation circuit.
Another aspect of the invention provides a charging post, including the charging post relay adhesion detection circuit.
Preferably, the charging pile further comprises a micro control unit, the micro control unit is connected with the isolation circuit, and the micro control unit prohibits charging of the charging pile when judging that the first line relay or/and the second relay is bonded according to the first line isolation signal and the second line isolation signal.
In another aspect, the present invention provides a method for detecting adhesion of a charging pile relay, which is used for the charging pile, and the method includes the following steps:
step 1: power-on initialization;
step 2: opening the first line relay and the second line relay;
and step 3: in a first time delay, only collecting the detection signal of the first line relay;
and 4, step 4: outputting the first line isolation signal according to the first line relay detection signal, and prohibiting the charging of the charging pile when judging that the first line relay is bonded according to the first line isolation signal;
and 5: when the first line of relays are judged not to be bonded according to the first line of isolation signals, acquiring detection signals of the second line of relays within a second time delay;
step 6: and outputting the second line isolation signal according to the second line detection signal, and prohibiting the charging of the charging pile when judging that the second line relay is bonded according to the second line isolation signal.
Preferably, when the second line isolation signal is used for judging that the second line relay is not bonded, the charging pile is allowed to be charged.
Preferably, determining that the first line relay is bonded according to the first line isolation signal includes:
and when the first line isolation signal is smaller than a preset threshold value, judging that the first line relay is bonded.
Preferably, the determining that the first line relay is not bonded according to the first line isolation signal includes:
and when the first line isolation signal is greater than or equal to a preset threshold value, judging that the first line relay is not bonded.
Preferably, the judging that the second wire relay is bonded according to the second wire isolation signal includes:
and when the second line isolation signal is smaller than a preset threshold value, judging that the second line relay is bonded.
Preferably, the judging that the second wire relay is not bonded according to the second wire isolation signal includes:
and when the second line isolation signal is greater than or equal to a preset threshold value, judging that the second line relay is not bonded.
According to the charging pile relay bonding detection circuit and the charging pile relay bonding detection method, detection signals of an L-line relay and a N-line relay are acquired through the L-line relay detection circuit and the N-line relay detection circuit, and the connection between the N-line relay detection circuit and an isolation circuit is controlled through a time delay circuit. The invention uses a common relay, and only one isolating circuit can accurately judge whether the relay is bonded or not by adopting the time delay circuit. The invention has the advantages of less used devices, low cost, high safety and higher practicability.
Drawings
The various aspects of the present invention will become more apparent to the reader after reading the detailed description of the invention with reference to the attached drawings. Wherein,
FIG. 1 is a schematic diagram of AC charging post power transmission;
fig. 2 is a system configuration diagram of a charging pile relay adhesion detection circuit according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a charging pile relay adhesion detection circuit according to an embodiment of the present invention;
FIG. 4 is an L-line isolation signal with an L-line relay bonded according to one embodiment of the present invention;
FIG. 5 is an L-line isolation signal when the L-line relay of one embodiment of the present invention is not bonded;
FIG. 6 is an N-wire isolation signal with an N-wire relay bonded according to one embodiment of the present invention;
FIG. 7 is an N-wire isolation signal when the N-wire relay of one embodiment of the present invention is not bonded;
fig. 8 is a system configuration diagram of a charging pile according to an embodiment of the present invention;
fig. 9 is a flowchart of a charging pile relay adhesion detection method according to an embodiment of the present invention;
description of reference numerals:
1: a charging pile relay bonding detection circuit; 2: charging piles;
11: an L-line relay detection circuit; 12: an N-wire relay detection circuit; 13: a delay circuit; 14: an isolation circuit.
21: an L-line relay; 22: an N-wire relay; 23: a micro control unit;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
The first embodiment is as follows:
the embodiment provides a fill electric pile relay bonding detection circuit 1 for electric automobile fills electric pile 2, it includes first line relay and second line relay to fill electric pile 2, in this embodiment, first line relay is L line relay 21, second line relay is N line relay 22, detection circuit 1 includes first line relay detection circuit, second line relay detection circuit, delay circuit 13 and isolating circuit 14, in this embodiment, first line relay detection circuit is L line relay detection circuit 11, second line relay detection circuit is N line relay detection circuit 12, please refer to fig. 2, wherein:
the L-line relay detection circuit 11 is connected to the L-line relay 21,
the N-line relay detection circuit 12 is connected to the N-line relay 22;
the isolation circuit 14 is connected to the L-line relay detection circuit 11 and the N-line relay detection circuit 12, respectively;
the delay circuit 13 is connected to the N-wire relay detection circuit 22.
Referring to fig. 3, in the present embodiment, the L-line relay detecting circuit 11 includes a second resistor R2, a first diode D1, an eighth resistor R8, a first resistor R1, a first capacitor C1, and a second zener diode D2;
the N-wire relay detection circuit 12 includes a tenth resistor R10, an eleventh resistor R11, a ninth resistor R9, an eighth diode D8, a tenth zener diode D10, and a fifth capacitor C5.
The delay circuit 13 includes a thirteenth resistor R13, a fourteenth resistor R14, a ninth diode D9, a sixth capacitor C6, a second switch tube Q2, and a first signal switch tube M1, and the first signal switch tube M1 is connected to the N-line relay detection circuit 12.
The isolation circuit 14 comprises a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first switch tube Q1, an isolation optocoupler U1 and a second capacitor C2.
In this embodiment, one end of the second resistor R2 is connected to the L-line relay 21, the other end is connected to the anode of the first diode D1, the cathode of the first diode D1 is connected to the cathode of the second zener diode D2, and the anode of the second zener diode D2 is connected to the base of the first switch Q1;
one end of the eighth resistor R8 is connected to the positive electrode of the first diode D1, the other end is connected to one end of the first resistor R1, and the other end of the first resistor R1 is connected to the negative electrode of the first diode D1;
the first capacitor C1 is connected in parallel with the first resistor R1;
in this embodiment, one end of the tenth resistor R10 is connected to the N-wire relay 22, the other end is connected to the positive electrode of the eighth diode D8, the negative electrode of the eighth diode D8 is connected to the negative electrode of the tenth zener diode D10, the positive electrode of the tenth zener diode D10 is connected to the base of the third switching tube Q3, the emitter of the third switching tube Q3 is connected to the eleventh resistor R11, and the collector of the third switching tube Q3 is connected to the collector of the first triode Q1 of the isolation circuit 14;
one end of the eleventh resistor R11 is connected to the anode of the eighth diode D8, and the other end is grounded;
one end of the ninth resistor R9 is connected with the cathode of the eighth diode D8, and the other end is grounded;
the fifth capacitor C5 is connected in parallel with the ninth resistor R9;
in this embodiment, the thirteenth resistor R13 is connected to the cathode of the ninth zener diode D9, and the anode of the second zener diode D9 is connected to the base of the second switch Q2;
one end of the sixth capacitor C6 is connected to the negative electrode of the ninth zener diode D9, and the other end is connected to the emitter of the second switching tube Q2;
one end of the fourteenth resistor R14 is connected to the thirteenth resistor R13, and the other end is connected to the collector of the second switch transistor Q2 and to the first signal switch transistor M1, and the first signal switch transistor M1 is connected to the base of the third switch transistor Q3.
In this embodiment, the collector of the first switching tube Q1 is connected to the primary side of the isolation optocoupler U1, and the emitter is grounded;
one end of the third resistor R3 is connected with the primary side of the isolation optocoupler U1, and the other end of the third resistor R3 is connected with a +12V power supply;
one end of the fourth resistor R4 is connected with the secondary side of the isolation optocoupler U1, and the other end of the fourth resistor R4 is connected with a +3.3V power supply;
one end of the fifth resistor R5 is connected with the secondary side of the isolation optocoupler U1, and the other end of the fifth resistor R5 is connected with the second capacitor C2 and the micro control unit 23;
the other end of the second capacitor C2 is grounded;
the working process of the charging pile relay adhesion detection system 1 is explained below to describe the technical scheme of the present invention in more detail:
(1) when the charging pile 2 is powered on, a first delay is entered, specifically, the first delay is 0.5S, the first signal switching tube M1 of the delay circuit 13 is turned on, the voltage at the base of the third switching tube Q3 is pulled down, and the third switching tube Q3 is turned off, so that the connection between the N-line relay detection circuit 12 and the isolation circuit 14 is disconnected. At this time, only the L-line relay detection circuit 11 is connected to the isolation circuit 14, and transmits the L-line relay detection signal to the isolation circuit 14.
Specifically, if the L-line relay 21 is stuck, the detection point of the L-line relay detection circuit 11 connected to the L-line relay 21 will be charged, and the L-line relay detection circuit 11 sends the L-line relay detection signal to the isolation circuit 14. In a power frequency period, the first switching tube Q1 is turned on for a part of time, a pulse signal is generated corresponding to the secondary side of the isolation optocoupler U1, and the L-line isolation signal is output after rectification 100ms after the first time delay, specifically, the L-line isolation signal is a dc voltage, and a threshold value smaller than a standard voltage of 3.3V is preset empirically, in this embodiment, the threshold value is 2.5V, and when the L-line relay 21 is not bonded, the dc voltage is lower than the threshold value (as shown in fig. 4).
Specifically, if the L-line relay 21 is not bonded, the detecting point of the L-line relay detecting circuit 11 connected to the L-line relay 21 will not be charged, the first switch tube Q1 will be turned off all the time, the original secondary side of the isolating optocoupler U1 is not turned on, and the secondary side output of the isolating optocoupler U1 will be greater than or equal to the threshold (as shown in fig. 5).
Therefore, when the L-line relay 21 is in a bonded or unbonded state, the output of the isolation optocoupler U1 is obviously different, and therefore whether the L-line relay 21 is bonded or not can be discriminated according to the output of the isolation optocoupler U1. And if the L-path relay 21 is bonded, the charging pile 2 enters a failure mode, and charging is forbidden.
(2) After the first time delay is finished, a second time delay is started, the second time delay is also 0.5S, at this time, the first signal switch tube M1 is turned off, the N-line relay detection circuit 12 is connected with the isolation circuit 14, and the N-line relay detection signal is sent to the isolation circuit 14.
Specifically, if the N-line relay 22 is stuck, the detection point where the N-line relay detection circuit 12 is connected to the N-line relay 22 is charged, the third switch tube Q3 is turned on, and the N-line relay detection circuit 12 sends the N-line relay detection signal to the isolation circuit 14. The original secondary side of the isolation optocoupler U1 generates a pulse signal, and the N-line isolation signal is output after rectification 100ms after the second time delay, specifically, the N-line isolation signal is a direct current voltage, and the direct current voltage is lower than the threshold (as shown in fig. 6).
Specifically, if the N-line relay 22 is not bonded, the detection point at which the N-line relay detection circuit 12 is connected to the N-line relay 22 is not charged, the third switch tube Q3 is always turned off, and since the L-line relay is normal at this time, the isolating optocoupler U1 is not turned on, and the secondary output of the isolating optocoupler U1 is greater than or equal to the threshold (as shown in fig. 7).
Therefore, in the bonded or unbonded state of the N-line relay 22, the output of the isolating optocoupler U1 is obviously different, so that whether the N-line relay 22 is bonded or not can be discriminated according to the output of the isolating optocoupler U1. And if the N-path relay 22 is bonded, the charging pile enters a failure mode, and charging is forbidden.
In addition, as can be seen from fig. 3, the charging pile relay adhesion detection circuit 1 only comprises a common chip resistor, a capacitor and a signal switch tube, and only one set of isolation circuit is provided, so that the circuit structure is simple, and the cost is low.
Example two:
the present embodiment provides a charging pile 2, including the charging pile relay adhesion detection circuit 1.
Referring to fig. 8, in the present embodiment, the charging pile 2 includes an L-line relay 21, an N-line relay 22, and a micro control unit 23; the charging pile relay bonding detection circuit 1 comprises an L-line relay detection circuit 11, an N-line relay detection circuit 12, a time delay circuit 13 and an isolation circuit 14. Wherein:
the L-line relay detection circuit 11 is connected to the L-line relay 21,
the N-line relay detection circuit 12 is connected to the N-line relay 22;
the isolation circuit 14 is connected to the L-line relay detection circuit 11 and the N-line relay detection circuit 12, respectively;
the time delay circuit 13 is connected with the N-line relay detection circuit 22;
the microcontroller unit 23 is connected to the isolation circuit 14.
The following describes the working process of the relay adhesion detection of the charging pile to describe the technical scheme of the invention in more detail:
(1) when the charging pile 2 is powered on and initialized, the micro control unit 23 controls the L-line relay 21 and the N-line relay 22 to be switched off.
(2) The delay circuit 13 starts to work, and in a first delay, the connection between the N-line relay detection circuit 12 and the isolation circuit 14 is disconnected through the delay circuit 13.
(3) In a first time delay, the L-line relay detection signal is sent to the isolation circuit 14 through the L-line relay detection circuit 11, and the isolation circuit 14 outputs an L-line isolation signal to the micro control unit 23 according to the L-line relay detection signal:
when the L-line isolation signal is smaller than a preset threshold, the micro control unit 23 determines that the L-line relay 21 is bonded, and prohibits charging of the charging pile;
when the L-line isolation signal is greater than or equal to a preset threshold, the micro control unit 23 determines that the L-line relay 21 is not bonded.
(4) When the L-line relay 21 is not bonded, entering a second time delay, and connecting the N-line relay detection circuit 12 and the isolation circuit 14 through the time delay circuit 13;
the N-line relay detection signal is sent to the isolation circuit 14 through the N-line relay detection circuit 12, and the isolation circuit 14 outputs an N-line isolation signal to the micro control unit 23 according to the N-line relay detection signal:
when the N-line isolation signal is smaller than a preset threshold value, the micro control unit 23 judges that the N-line relay 22 is bonded, and prohibits charging of the charging pile;
when the N-line isolation signal is greater than or equal to a preset threshold value, the micro control unit 23 determines that the N-line relay 22 is not bonded.
(5) When the L-line relay 21 and the N-line relay 22 are not bonded, the micro control unit 23 attracts the L-line relay 21 and the N-line relay 22 to allow the charging pile 2 to charge.
Example three:
the embodiment provides a charging pile relay adhesion detection method, which is used for the charging pile 2 as described above, with reference to fig. 9, and the method includes the following steps:
s1: the charging pile 2 is electrified and initialized;
s2: the L-line relay 21 and the N-line relay 22 are turned off;
s3: in a first time delay, only collecting the L-line relay detection signal, and not collecting the N-line relay detection signal;
s4: isolating and rectifying the L-line relay detection signal to obtain an L-line isolation signal;
s41: when the L-line isolation signal is smaller than a preset threshold value, judging that the L-line relay 21 is bonded, and executing S7;
s42: and when the L-line isolation signal is greater than or equal to a preset threshold value, judging that the L-line relay 21 is not bonded.
S5: after S42, collecting the N-line relay detection signal in a second time delay;
s6: isolating and rectifying the N-line relay detection signal to obtain the N-line isolation signal;
s61: when the N-line isolation signal is smaller than a preset threshold value, judging that the N-line relay 22 is bonded, and executing S7;
s62: when the N-line isolation signal is greater than or equal to the preset threshold, it is determined that the N-line relay 22 is not bonded, and S8 is performed.
S7: entering a fault mode, and forbidding charging of the charging pile 2;
s8: and attracting the L-line relay 21 and the N-line relay 22 to allow the charging pile 2 to charge.
According to the charging pile relay bonding detection circuit and the charging pile relay bonding detection method, detection signals of an L-line relay and a N-line relay are acquired through the L-line relay detection circuit and the N-line relay detection circuit, and the connection between the N-line relay detection circuit and an isolation circuit is controlled through a time delay circuit. The invention uses a common relay and adopts a time delay circuit, so that whether the relay is bonded or not can be accurately judged by only one isolating circuit. The invention has the advantages of less used devices, low cost, high safety and higher practicability.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the invention and are not to be construed as limiting the embodiments of the present invention, and that various other changes and modifications may be made by those skilled in the art based on the above description. All documents mentioned in this application are incorporated by reference into this application as if each were individually incorporated by reference.

Claims (11)

1. The utility model provides a fill electric pile relay bonding detection circuit for electric automobile's the electric pile that fills, it includes first line relay and second line relay to fill electric pile, a serial communication port, detection circuit includes first line relay detection circuit, second line relay detection circuit, time delay circuit and isolating circuit, wherein:
the first line relay detection circuit is connected with the first line relay, and the second line relay detection circuit is connected with the second line relay; the isolation circuit is respectively connected with the first line relay detection circuit and the second line relay detection circuit; the time delay circuit is connected with the second line relay detection circuit;
in a first time delay, the time delay circuit disconnects the connection between the second line relay detection circuit and the isolation circuit, the first line relay detection circuit sends a first line relay detection signal to the isolation circuit, the isolation circuit outputs a first line isolation signal according to the first line relay detection signal, and the charging pile prohibits charging of the charging pile when the first line relay is judged to be bonded according to the first line isolation signal;
when the first line relay is not bonded, in a second time delay, the time delay circuit connects the second line relay detection circuit with the isolation circuit, the second line relay detection circuit sends a second line relay detection signal to the isolation circuit, the isolation circuit outputs a second line isolation signal according to the second line relay detection signal, and the charging pile prohibits charging of the charging pile when judging that the second line relay is bonded according to the second line isolation signal.
2. The charging pile relay adhesion detection circuit of claim 1, wherein the isolation circuit comprises a first switch tube, an isolation optocoupler and a rectifier circuit, wherein:
the base electrode of the first switch tube is connected with the first line relay detection circuit, the emitting electrode of the first switch tube is grounded, and the collector electrode of the first switch tube is connected with the primary side of the isolation optocoupler;
the secondary side of the isolation optocoupler is connected with a standard voltage;
the rectification circuit is connected with the secondary side of the isolation optocoupler;
in the first time delay, the isolation circuit isolates and rectifies the detection signal of the first line relay and then outputs the first line isolation signal;
and in the second time delay, the isolating circuit isolates and rectifies the detection signal of the second line relay and then outputs the second line isolation signal.
3. The charging pile relay adhesion detection circuit of claim 2, wherein the time delay circuit comprises a first signal switch tube, and the first signal switch tube is connected with the second line relay detection circuit;
in the first time delay, the first signal switch tube is switched on, and the second line relay detection circuit is disconnected with the isolation circuit;
and in the second time delay, the first signal switch tube is turned off, and the second line relay detection circuit is connected with the isolation circuit.
4. A charging pile comprising the charging pile relay adhesion detection circuit according to any one of claims 1 to 3.
5. The charging pile according to claim 4, characterized in that the charging pile further comprises a micro control unit, the micro control unit is connected with the isolation circuit, and the micro control unit prohibits the charging pile from charging when judging that the first line relay or/and the second relay is/are bonded according to the first line isolation signal and the second line isolation signal.
6. A charging pile relay adhesion detection method for a charging pile according to claim 5, comprising the steps of:
step 1: power-on initialization;
step 2: opening the first line relay and the second line relay;
and step 3: in a first time delay, only collecting the detection signal of the first line relay;
and 4, step 4: outputting the first line isolation signal according to the first line relay detection signal, and prohibiting the charging of the charging pile when judging that the first line relay is bonded according to the first line isolation signal;
and 5: when the first line of relays are judged not to be bonded according to the first line of isolation signals, acquiring detection signals of the second line of relays within a second time delay;
step 6: and outputting the second line isolation signal according to the second line detection signal, and prohibiting the charging of the charging pile when judging that the second line relay is bonded according to the second line isolation signal.
7. The method for detecting adhesion of a charging pile relay as claimed in claim 6, wherein the charging pile is allowed to be charged when it is determined that the second wire relay is not adhered according to the second wire isolation signal.
8. The method of claim 6, wherein determining the first line relay adhesion based on the first line isolation signal comprises:
and when the first line isolation signal is smaller than a preset threshold value, judging that the first line relay is bonded.
9. The method of claim 6, wherein the determining that the first line relay is not bonded according to the first line isolation signal comprises:
and when the first line isolation signal is greater than or equal to a preset threshold value, judging that the first line relay is not bonded.
10. The charging pile relay adhesion detection method of claim 6, wherein the determining the second wire relay adhesion according to the second wire isolation signal comprises:
and when the second line isolation signal is smaller than a preset threshold value, judging that the second line relay is bonded.
11. The charging pile relay adhesion detection method of claim 7, wherein the determining that the second wire relay is not adhered according to the second wire isolation signal comprises:
and when the second line isolation signal is greater than or equal to a preset threshold value, judging that the second line relay is not bonded.
CN202111288702.0A 2021-11-02 Charging pile relay bonding detection circuit and method Active CN113900019B (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN202111288702.0A CN113900019B (en) 2021-11-02 Charging pile relay bonding detection circuit and method

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CN113900019B CN113900019B (en) 2024-10-18

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