CN108001270B - Direct current charging circuit and direct current charging detection method - Google Patents
Direct current charging circuit and direct current charging detection method Download PDFInfo
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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
- B60L53/20—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 characterised by converters located in the vehicle
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- H02J7/0086—
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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
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
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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
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/92—Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles
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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
- Y02T90/14—Plug-in electric vehicles
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a direct current charging circuit and a direct current charging detection method, wherein the direct current charging circuit comprises: a charge controller; the DC/DC converter is respectively connected with the battery pack and the charging controller and is used for converting the output voltage of the battery pack into a power supply voltage and supplying power to the charging controller; the detection circuit is provided with a detection resistor, the first end of the detection resistor is connected with the output end of the DC/DC converter, and the second end of the detection resistor is connected with a charging connection confirmation end to form a detection point of the detection circuit; the charging controller is connected with the detection points and used for detecting the voltage values of the detection points. The invention can effectively distinguish the PE contact as normal connection or disconnection, thereby effectively avoiding the risk of high-voltage electric shock in the charging process.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a direct-current charging circuit and a direct-current charging detection method.
Background
The specification in b.3.5 in national standard GBT18487.1-2015 specifies that in the charging (fast charging) process, an automobile can detect whether a PE (Protective earth) pin has a disconnection problem (because a charging connector terminal of a charging pile has a problem, a PE line at a vehicle end and a pile end cannot be connected).
For an electric automobile with a 12V voltage platform, when the voltage range of a detection point 2 recommended by the national standard GBT18487.1-2015 is 11.2-12.8V (self-configurable), the voltage of the detection point 2 is about 6V before and after a PE needle is disconnected in the charging process of the automobile and a quick charging pile, and the voltage of a pile detection point 1 is about 4V, so that the voltage coincidence range of the detection point 1 before and after the PE needle is disconnected is large, the voltage coincidence range of the detection point 2 before and after the PE needle is disconnected is large, and the PE needle disconnection cannot be effectively distinguished by the automobile and the charging pile. In the charging process, insulation detection is performed by a vehicle, after a PE pin is broken, the insulation detection cannot cover the whole charging loop (insulation detection cannot be performed on the side of a charging pile), if the insulation problem occurs at the moment, high voltage electricity cannot be disconnected to protect users according to the fault definition requirements specified by the national standard due to detection failure, and the risk of electric shock exists.
In conclusion, in the prior art, the broken pin of the PE cannot be effectively detected in the direct charging process, so that the high-voltage electric shock risk exists in the charging process.
Disclosure of Invention
The invention aims to provide a direct current charging circuit and a direct current charging detection method, and aims to solve the problem that in the prior art, the high-voltage electric shock risk exists in the charging process due to the fact that a PE broken pin cannot be effectively detected in the direct charging process.
In order to solve the technical problem, the invention is realized as follows:
in a first aspect, an embodiment of the present invention provides a dc charging circuit, including:
a charge controller;
the DC/DC converter is respectively connected with the battery pack and the charging controller and is used for converting the output voltage of the battery pack into a power supply voltage and supplying power to the charging controller;
the detection circuit is provided with a detection resistor, the first end of the detection resistor is connected with the output end of the DC/DC converter, and the second end of the detection resistor is connected with a charging connection confirmation end to form a detection point of the detection circuit; the charging controller is connected with the detection points and used for detecting the voltage values of the detection points.
The charging controller comprises a voltage detection chip, wherein the voltage detection chip is connected with the detection points and is used for detecting the voltage values of the detection points.
Wherein, the detection circuit is arranged in the charging controller.
And the first end of the detection resistor is connected with the positive electrode output end of the DC/DC converter.
The charging controller is a battery management system BMS or a vehicle control unit VCU.
In a second aspect, an embodiment of the present invention provides a method for detecting dc charging, which is applied to the above dc charging circuit, and the method includes:
detecting a detection point voltage value of a detection point when the electric automobile is connected with charging equipment and carries out direct current charging;
and comparing the voltage value of the detection point with a preset voltage value, and if the voltage value of the detection point is greater than the preset voltage value, sending a charging end signal to the charging equipment.
Wherein, the step of comparing the voltage value of the detection point with a preset voltage value, and if the voltage value of the detection point is greater than the preset voltage value, sending a charging end signal to the charging device further includes:
and sending a charging end signal to the charging equipment, and simultaneously sending contact fault information of a protective grounding contact to the charging equipment.
Wherein the preset voltage value is 7.5V.
Wherein, if the detection point voltage value is greater than a preset voltage value, the step of sending a charging end signal to the charging device further includes:
and sending a charging end signal to the charging equipment, and sending an alarm signal to a sound prompting device of the electric automobile to make the sound prompting device send out a warning sound.
Wherein, if the detection point voltage value is greater than a preset voltage value, the step of sending a charging end signal to the charging device further includes:
and sending a charging end signal to the charging equipment, and simultaneously sending a fault display signal to an instrument of the electric automobile, so that the instrument displays contact fault information of the protective grounding contact.
In the embodiment of the invention, the PE contact can be effectively distinguished to be normally connected or disconnected, so that the high-voltage electric shock risk in the charging process can be effectively avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a dc charging circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an equivalent circuit of a detection circuit according to an embodiment of the present invention;
FIG. 3 is a second schematic diagram of an equivalent circuit of the detection circuit according to the embodiment of the present invention;
fig. 4 is a schematic flow chart illustrating a method for detecting dc charging according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, a schematic structural diagram of a dc charging circuit according to an embodiment of the invention is shown. In fig. 1, DC + and DC-denote power terminals for DC charging; s +, S-represents a communication signal; CC1 and CC2 respectively indicate a charging device connection confirmation signal and a vehicle connection confirmation signal; a + and A-are low-voltage auxiliary power supplies; PE denotes a protection ground terminal.
An embodiment of the present invention provides a dc charging circuit, which may include:
a charge controller 13;
a DC/DC converter 12, respectively connected to the battery pack 11 and the charging controller 13, for converting the output voltage of the battery pack 11 into a power supply voltage to supply power to the charging controller 13;
a detection circuit provided with a detection resistor R5, a first end of the detection resistor R5 is connected with the output end of the DC/DC converter 12, and a second end of the detection resistor R5 is connected with a charging connection confirmation end to form a detection point of the detection circuit; the charging controller 13 is connected to the detection points, and is configured to detect a detection point voltage value of the detection points.
In the embodiment of the invention, an electric automobile is connected with a charging device through a charging interface to perform direct current charging, a battery pack 11 receives a charging power supply and outputs the charging power supply to a DC/DC converter 12, the DC/DC converter 12 receives an output voltage of the battery pack 11 and converts the output voltage into a power supply voltage, and the power supply voltage is respectively output to a storage battery 14 and a charging controller 13, wherein the storage battery is a 12V storage battery; the detection circuit is connected to the connection end of the charging controller and the DC/DC converter 12, so that the first end of the detection resistor R5 is connected to the output end of the DC/DC converter 12, that is, the detection circuit is directly powered by the output end of the DC/DC converter 12, and the output voltage of the DC/DC converter 12 is used as the vehicle detection point power supply U2; the second terminal of the detection resistor R5 is connected to the charging connection confirmation terminal to form the detection point of the detection circuit, i.e., the detection point 2 in fig. 1, where the second terminal of the detection resistor R5 is connected to the resistor R3 via the charging connection confirmation terminal and then connected to the protection ground terminal; in addition, as shown in fig. 1, in the charging device, one end of a resistor R1 is connected to a charging device detection point power source U1, and the other end is connected to a resistor R2 and a resistor R4 respectively to form a detection point 1, wherein the resistor R2 and the resistor R4 are connected in parallel and then connected to a protection ground terminal.
In the embodiment of the present invention, a first end of the detection resistor is connected to a positive output end of the DC/DC converter.
In the embodiment of the invention, in the normal charging process, the PE contact is normally connected, the equivalent circuit of the detection circuit is as shown in fig. 2, at this time, since the power supply U2 at the vehicle detection point is supplied through the output terminal of the DC/DC converter 12, the voltage of the power supply U2 at the vehicle detection point can be raised to (14 ± 0.25) V (the voltage control error of the DC/DC converter 12 is 0.25V), then U2 at 13.75V ≤ 14.25V, U1 at 11.2V ≤ 12.8V, and the resistances of the resistor R1, the resistor R2, the resistor R3, the resistor R4, and the detection resistor R5 are (1000 ± 30) Ω. Therefore, according to the circuit connection relationship of the equivalent circuit shown in fig. 2, the detected point voltage value at the detected point 2 is U2 × R3/(R5+ R3), and the detected point voltage value at the detected point 2 ranges from 6.66V to 7.34V.
When the PE contact is disconnected (failed), the equivalent circuit of the detection circuit is as shown in fig. 3, and at this time, according to the circuit connection relationship of the equivalent circuit shown in fig. 3, where I1 is the current flowing through the resistor R3, the resistor R4 and the detection resistor R5, I2 is the current flowing through the resistor R1, and I3 is the current flowing through the resistor R2, it can be obtained:
U1＝I2*R1+R2*I3；
U2＝I1*(R3+R4+R5)-R2*I3；
I2＝I1+I3；
the detection point voltage value of the detection point 2 is U2-I1R 5;
then the derivation can be derived from the above equation: detection point voltage value of detection point 2 ═
U2-R5*(U1*(R1+R2)+R2*U1)/((R2+R3+R4+R5)*(R1+R2)-R2*R2)；
The voltage value of the detecting point 2 is 7.71-8.84V.
In the embodiment of the present invention, the charging controller 13 is configured to detect a detection point voltage value of a detection point (i.e., the detection point 2) when the electric vehicle is connected to the charging device and performs dc charging; and comparing the voltage value of the detection point with a preset voltage value, and if the voltage value of the detection point is greater than the preset voltage value, sending a charging end signal to the charging equipment so as to enable the charging equipment to end charging. Therefore, in the embodiment of the invention, the charging controller detects the voltage value of the detection point (namely the detection point 2), so that the PE contact can be effectively distinguished to be normally connected or disconnected, and the risk of high-voltage electric shock in the charging process can be effectively avoided.
In addition, considering that the normal voltage detection deviation is 0.1V, in the embodiment of the present invention, the preset voltage value may be 7.5V.
In addition, in order to facilitate the understanding of the corresponding fault information when the charging device stops charging, the charging controller 13 may be further configured to send the protective grounding contact fault information to the charging device at the same time of sending the charging end signal to the charging device.
In addition, the charging controller 13 may be further configured to send a charging end signal to the charging device and send an alarm signal to a sound prompt device of the electric vehicle, so that the sound prompt device sends out a warning sound.
In addition, the charging controller 13 may be further configured to send a charging end signal to the charging device and send a fault display signal to an instrument of the electric vehicle, so that the instrument displays contact fault information of the protection ground contact.
In this embodiment of the present invention, the charging controller 13 may include a voltage detection chip 131, and the voltage detection chip 131 is connected to the detection points and is configured to detect voltage values at the detection points.
Wherein the detection circuit is disposed in the charging controller 13.
The charging controller 13 is a Battery Management System (BMS) or a Vehicle Control Unit (VCU).
In addition, referring to fig. 4, a schematic flow chart of a method for detecting dc charging according to an embodiment of the present invention is shown, and the embodiment of the present invention further provides a method for detecting dc charging, which is applied to the dc charging circuit, and the method includes the following steps:
In the embodiment of the invention, the voltage value of the detection point (namely the detection point 2) is compared with the preset voltage value, and if the voltage value of the detection point is greater than the preset voltage value and indicates that the PE contact is disconnected (failed), a charging end signal is sent to the charging equipment to stop charging the charging equipment, so that the risk of high-voltage electric shock in the charging process can be avoided.
In step 402, the step of comparing the voltage value of the detection point with a preset voltage value, and if the voltage value of the detection point is greater than the preset voltage value, sending a charging end signal to the charging device may further include: and sending a charging end signal to the charging equipment, and simultaneously sending contact fault information of a protective grounding contact to the charging equipment. Therefore, the charging equipment can know corresponding fault information conveniently when stopping charging.
Wherein the preset voltage value may be 7.5V.
In step 402, if the voltage value of the detection point is greater than a preset voltage value, the step of sending a charging end signal to the charging device may further include: and sending a charging end signal to the charging equipment, and sending an alarm signal to a sound prompting device of the electric automobile to make the sound prompting device send out a warning sound.
In step 402, if the voltage value of the detection point is greater than a preset voltage value, the step of sending a charging end signal to the charging device may further include: and sending a charging end signal to the charging equipment, and simultaneously sending a fault display signal to an instrument of the electric automobile, so that the instrument displays contact fault information of the protective grounding contact.
The embodiment of the invention can effectively distinguish the PE contact as normal connection or disconnection, thereby effectively avoiding the risk of high-voltage electric shock in the charging process.
For simplicity of explanation, the foregoing method embodiments are described as a series of acts or combinations, but it should be understood by those skilled in the art that the present invention is not limited by the order of acts or acts described, as some steps may occur in other orders or concurrently with other steps in accordance with the invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no particular act is required to implement the invention.
It is noted that, in the embodiments of the present invention, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A dc charging circuit, comprising:
a charge controller;
the DC/DC converter is respectively connected with the battery pack and the charging controller and is used for converting the output voltage of the battery pack into a power supply voltage and supplying power to the charging controller;
the detection circuit is provided with a detection resistor, the first end of the detection resistor is connected with the output end of the DC/DC converter, and the second end of the detection resistor is connected with a charging connection confirmation end to form a detection point of the detection circuit; the charging controller is connected with the detection points and is used for detecting the voltage values of the detection points;
the charging controller is used for detecting a detection point voltage value of a detection point when the electric automobile is connected with the charging equipment and carries out direct current charging; and comparing the voltage value of the detection point with a preset voltage value, and if the voltage value of the detection point is greater than the preset voltage value, sending a charging end signal to the charging equipment so as to enable the charging equipment to end charging.
2. The dc charging circuit of claim 1, wherein the charging controller comprises a voltage detection chip, the voltage detection chip is connected to the detection points for detecting the voltage values of the detection points.
3. The dc charging circuit of claim 1, wherein the detection circuit is disposed within the charging controller.
4. The DC charging circuit of claim 1, wherein a first terminal of the sensing resistor is coupled to a positive output terminal of the DC/DC converter.
5. The dc charging circuit of claim 1, wherein the charging controller is a Battery Management System (BMS) or a Vehicle Control Unit (VCU).
6. A method for detecting dc charging, applied to a dc charging circuit according to any one of claims 1 to 5, the method comprising:
detecting a detection point voltage value of a detection point when the electric automobile is connected with charging equipment and carries out direct current charging;
and comparing the voltage value of the detection point with a preset voltage value, and if the voltage value of the detection point is greater than the preset voltage value, sending a charging end signal to the charging equipment.
7. The method of claim 6, wherein the step of comparing the detected point voltage value with a predetermined voltage value and sending a charging end signal to the charging device if the detected point voltage value is greater than the predetermined voltage value further comprises:
and sending a charging end signal to the charging equipment, and simultaneously sending contact fault information of a protective grounding contact to the charging equipment.
8. The method according to claim 6, wherein the preset voltage value is 7.5V.
9. The method of claim 6, wherein the step of sending a charging end signal to the charging device if the detected point voltage value is greater than a predetermined voltage value further comprises:
and sending a charging end signal to the charging equipment, and sending an alarm signal to a sound prompting device of the electric automobile to make the sound prompting device send out a warning sound.
10. The method of claim 6, wherein the step of sending a charging end signal to the charging device if the detected point voltage value is greater than a predetermined voltage value further comprises:
and sending a charging end signal to the charging equipment, and simultaneously sending a fault display signal to an instrument of the electric automobile, so that the instrument displays contact fault information of the protective grounding contact.
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| CN108909492A (en) * | 2018-07-06 | 2018-11-30 | 北京新能源汽车股份有限公司 | Charging and discharging system and vehicle |
| CN108973758A (en) * | 2018-08-31 | 2018-12-11 | 金华安靠电源科技有限公司 | A kind of charging recognition methods of charging system for electric automobile and electric car charging circuit |
| CN109050329B (en) * | 2018-09-14 | 2020-08-04 | 北京新能源汽车股份有限公司 | Direct current charging control guide circuit, adaptive interface circuit and charging control method |
| CN109217260A (en) * | 2018-09-27 | 2019-01-15 | 倍登新能源科技（苏州）有限公司 | Overcurrent protector for power tool battery packet |
| JP6532638B1 (en) * | 2018-12-04 | 2019-06-19 | 三菱電機株式会社 | Electric vehicle, charging system and charging / discharging system |
| CN112305460A (en) * | 2020-10-22 | 2021-02-02 | 深圳来电科技有限公司 | On-off detection circuit and on-off detection method for charging wire of mobile power supply |
| CN114113833B (en) * | 2021-11-11 | 2024-05-14 | 阳光电源股份有限公司 | Charging pile, charging pile line detection method and device |
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| US9570933B2 (en) * | 2015-05-21 | 2017-02-14 | Edward M. Sioma | Charging system having active error correction for rechargeable batteries |
| CN106114247B (en) * | 2016-04-27 | 2019-03-22 | 恒大法拉第未来智能汽车（广东）有限公司 | Charging unit, charging method and vehicle |
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