CN113872284A - High-voltage direct-current charging circuit and charging method for electric automobile - Google Patents
High-voltage direct-current charging circuit and charging method for electric automobile Download PDFInfo
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- CN113872284A CN113872284A CN202111131474.6A CN202111131474A CN113872284A CN 113872284 A CN113872284 A CN 113872284A CN 202111131474 A CN202111131474 A CN 202111131474A CN 113872284 A CN113872284 A CN 113872284A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
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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
- B60L53/24—Using the vehicle's propulsion converter for charging
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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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
- Y02T10/80—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
-
- 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
Abstract
The invention provides a high-voltage direct-current charging circuit and a charging method for an electric automobile, wherein the charging circuit comprises a power supply; a motor controller including a first phase, a second phase, and a third phase; the motor comprises a first winding, a second winding and a third winding; one end of the switching element K1 is connected with the joint of the first winding, the second winding and the third winding, and the other end is externally connected with a DC charging seat; an interface capacitance C2; when the dc charging base outputs the low-voltage dc power to the charging circuit, the switching element K1 is turned on, and the first phase, the second phase, and the third phase are turned on, so that the first phase, the second phase, and the third phase serve as a switching arm of the boost circuit of the charging circuit, and the low-voltage dc power is boosted to the high-voltage dc power based on the pumping energy of the dc charging base. After the technical scheme is adopted, the driving inverter is used as the DCDC circuit of the power conversion circuit, so that the 400V direct current quick charging pile can be directly applied to the direct current quick charging of the electric automobile with the 800V high-voltage bus system.
Description
Technical Field
The invention relates to the field of electric automobiles, in particular to a high-voltage direct-current charging circuit and a charging method for an electric automobile.
Background
With the rapid development of electric vehicles, the main problems to be solved are the endurance mileage and the charging speed of the user. When the electric vehicle runs out of power, the user is required to quickly charge the electric vehicle to continue driving.
The conventional charging method is ac charging or dc charging, and a large number of dc charging stations have been built due to the fast charging speed of dc charging. For the electric automobile with a 400V power supply system which is popularized at present, a more complete infrastructure is established at present. Compared with a 400V direct current bus, the electric automobile with the 800V direct current bus system has more advantages in power performance. Therefore, on the electric vehicle side, there are more and more cases where an 800V high-voltage bus system is arranged, but infrastructure construction of a dc fast-charging pile compatible with an 800V battery system is insufficient.
Therefore, a novel high-voltage direct-current charging circuit for an electric automobile is needed, and when the electric automobile is plugged into a low-voltage charging pile, the high-voltage direct-current charging circuit can also be boosted to charge the electric automobile.
Disclosure of Invention
In order to overcome the technical defects, the invention aims to provide a high-voltage direct-current charging circuit and a charging method for an electric vehicle, wherein a driving inverter is used as a DCDC circuit of a power conversion circuit, so that a 400V direct-current rapid charging pile can be directly applied to direct-current rapid charging of the electric vehicle with an 800V high-voltage bus system.
The invention discloses a high-voltage direct-current charging circuit of an electric automobile, which is arranged in the electric automobile and comprises:
the power supply is arranged on the charging circuit;
the motor controller is connected in parallel with two ends of the power supply and comprises a first phase, a second phase and a third phase which form a three-phase circuit;
the motor comprises a first winding, a second winding and a third winding which form a three-phase winding, wherein the first winding, the second winding and the third winding are respectively connected with a first phase, a second phase and a third phase in parallel;
one end of the switching element K1 is connected with the joint of the first winding, the second winding and the third winding, and the other end is externally connected with a DC charging seat;
an interface capacitor C2, one end of which is connected with the switch element K1 and the other end of which is connected to the charging circuit;
when the dc charging base outputs the low-voltage dc power to the charging circuit, the switching element K1 is turned on, and the first phase, the second phase, and the third phase are turned on, so that the first phase, the second phase, and the third phase serve as a switching arm of the boost circuit of the charging circuit, and the low-voltage dc power is boosted to the high-voltage dc power based on the pumping energy of the dc charging base.
Preferably, the first phase comprises a switch tube S1 and a switch tube S2 which are connected in series and are connected to the charging circuit;
the second phase comprises a switch tube S3 and a switch tube S4 which are connected in series and are connected to the charging circuit in parallel;
the third phase comprises a switch tube S5 and a switch tube S6 which are connected in series and are connected to the charging circuit in parallel;
one end of the first winding is connected between the switch tube S1 and the switch tube S2;
one end of the second winding is connected between the switch tube S3 and the switch tube S4;
one end of the third winding is connected between the switch tube S5 and the switch tube S6;
the joint of the first winding, the second winding and the third winding is the central point of the motor;
when the electric automobile runs, the switching tube S1, the switching tube S2, the switching tube S3, the switching tube S4, the switching tube S5 and the switching tube S6 are conducted to run in a PWM mode;
when the charging circuit is connected to the high-voltage direct-current output end of the direct-current charging seat, the switch tube S1, the switch tube S2, the switch tube S3, the switch tube S4, the switch tube S5 and the switch tube S6 are turned off, and the switch element K1 is turned off, so that a charging mode that the direct-current charging seat is in direct impulse to the power supply is formed;
when the charging circuit is connected to the low-voltage dc output terminal of the dc charging stand, the switching tube S1, the switching tube S2, the switching tube S3, the switching tube S4, the switching tube S5, and the switching tube S6 are turned on, and the switching element K1 is turned on, so that the switching tube S1, the switching tube S2, the switching tube S3, the switching tube S4, the switching tube S5, and the switching tube S6 form a boosting circuit, and the low-voltage dc output from the low-voltage dc output terminal is boosted to a high-voltage dc to charge the power supply.
Preferably, the charging circuit further comprises:
an interface capacitor C1 connected in parallel with the first capacitor on the charging circuit;
one end of the switching element K0 is connected to a power supply, and the other end is connected to the interface capacitor C1.
The invention also discloses a high-voltage direct-current charging method of the electric automobile, which is applied to the charging circuit and is characterized by comprising the following steps of:
detecting the access state of the charging circuit connected with the direct current charging seat, wherein the access state comprises an access relation and an access port;
when the access port is a high-voltage direct-current output end, the direct-current charging seat directly rushes towards the power supply;
when the access port is a low-voltage direct-current output end, the switching element K1 is closed.
Preferably, the access state of the charging circuit connected to the dc charging stand is detected, the access state includes an access relationship and an access port, the access relationship includes an accessed state and an unaccessed state, and the access port includes a high-voltage charging port and a low-voltage charging port disposed on the dc charging stand.
Preferably, when the access port is a high voltage dc output port, the step of dc charging the dc charging socket to the power supply includes: the charging circuit is connected with the positive pole and the high-voltage negative pole of the direct-current charging seat in a plugging mode, the switch element K1 is disconnected, and the switch tube S1, the switch tube S2, the switch tube S3, the switch tube S4, the switch tube S5 and the switch tube S6 are disconnected;
when the access port is a low-voltage direct-current output end, the step of closing the switching element K1 comprises the following steps:
the charging circuit is connected with the positive electrode and the low-voltage negative electrode of the direct-current charging seat in a plugging mode, the switch element K1 is closed, and the switch tube S1, the switch tube S2, the switch tube S3, the switch tube S4, the switch tube S5 and the switch tube S6 are conducted.
After the technical scheme is adopted, compared with the prior art, the method has the following beneficial effects:
1. for the electric automobile, on the premise of basically not increasing the BOM cost, the dependence of the electric automobile on a specific charging pile when the electric automobile is configured into an 800V high-voltage direct-current system is avoided, the charging pile side does not need to be changed, and the quick high-voltage charging of the electric automobile can be met;
2. the motor does not generate extra torque in the charging process, so that a mechanical system is protected, and the charging adaptability is improved.
Drawings
FIG. 1 is a schematic diagram of a circuit design of a high voltage DC charging circuit for an electric vehicle according to a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of a first embodiment of a high-voltage DC charging circuit for an electric vehicle according to the present invention;
FIG. 3 is a schematic circuit diagram of a high-voltage DC charging circuit for an electric vehicle according to a first embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of a high-voltage DC charging circuit for an electric vehicle according to a first embodiment of the present invention;
fig. 5 is a schematic flow chart of a high-voltage direct-current charging method for an electric vehicle according to a preferred embodiment of the invention.
Detailed Description
The advantages of the invention are further illustrated in the following description of specific embodiments in conjunction with the accompanying drawings.
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no specific meaning in themselves. Thus, "module" and "component" may be used in a mixture.
Referring to fig. 1, a schematic circuit design diagram of an electric vehicle high-voltage dc charging circuit according to a preferred embodiment of the present invention is shown, in which the electric vehicle high-voltage dc charging circuit is disposed in an electric vehicle and is used for charging the electric vehicle with high-voltage dc. Specifically, the charging circuit includes:
-a power supply
A power source, such as a battery, a battery pack, etc., is a device disposed in an electric vehicle that provides an electrical power output for the electric vehicle. When the power in the power supply is depleted, it needs to be charged. Therefore, the power supply is arranged on the charging circuit, and the charging circuit can be connected with external charging equipment, such as a charging pile, a direct current charging base and the like.
-a motor controller
The motor controller is usually a neural center for connecting the motor and the battery, is used for adjusting and calibrating various performances of the whole electric automobile, plays a role in ensuring basic safety and accurate control of the automobile, and can also enable the battery and the motor to exert sufficient strength. In the present embodiment, the motor controller is different from the original function (or is based on the original function), and a configuration for charging the power supply is added, that is, the motor controller in the present embodiment is used for controlling the motor and also for controlling the charging of the power supply. Specifically, the motor controller is connected in parallel across the power supply, and has therein a first phase, a second phase, and a third phase forming a three-phase circuit, that is, U, V, W phase which is commonly understood (correspondence of the first phase, the second phase, and the third phase to U, V, W phase is not limited in the present invention, and any one phase may be regarded as the first phase, and so on). Likewise, in this embodiment, the three-phase circuit will affect the state of charge of the charging circuit to the power supply in addition to the control of the motor.
-an electric machine
The motor is equipment for converting electric energy into mechanical energy in the electric automobile. In this embodiment, the motor includes a first winding, a second winding, and a third winding that form a three-phase winding, and the first winding, the second winding, and the third winding are respectively connected in parallel with the first phase, the second phase, and the third phase to complete the basic control of the motor controller on the motor.
Switching element K1
In this embodiment, the junction of the first winding, the second winding and the third winding is additionally pulled out, and a switch element K1 is externally connected, so that one end of the switch element K1 is connected to the junction of the first winding, the second winding and the third winding, the other end of the switch element K1 is externally connected to an external dc charging socket, for example, the other end of the switch element K1 is empty, and when a charging head of the external dc charging socket is inserted into a charging port of an electric vehicle, the external dc charging socket is electrically connected to the switch element K1.
Interface capacitance C2
One end of the interface capacitor C2 is connected to the switching element K1, and the other end is connected to the charging circuit, so that the switching element K1 and the interface capacitor C2 form a boost charging circuit.
After the configuration is adopted, when the direct current charging seat is connected with the charging circuit through the charging head, the switching element K1 is closed, the first phase, the second phase and the third phase are closed, so that a three-phase inductance is formed by three-phase windings of the motor, the first phase, the second phase and the third phase are used as a switching bridge arm of a boosting charging circuit formed by the switching element K1 and the interface capacitor C2, when the direct current charging seat can only provide low-voltage direct current, such as 300 plus 500V, the boosting charging circuit formed by the switching element K1 and the interface capacitor C2 is boosted to high-voltage direct current, such as 800V, after the direct current charging seat is powered, the boosted direct current charging seat is input into a power supply through the switching bridge arm, and the direct current charging seat capable of only supporting the low-voltage direct current is formed to provide high-voltage direct current for the power supply for quick charging. That is to say, the motor and the motor controller which are not used for the charging circuit are utilized to boost the charging voltage, so that no additional circuit element is required to be added, and good use experience is provided for users.
In a preferred embodiment, the specific components of the charging circuit are configured as follows: the first phase comprises a switch tube S1 and a switch tube S2 which are connected in series and are connected to a charging circuit in parallel; the second phase comprises a switch tube S3 and a switch tube S4 which are connected in series and are connected to the charging circuit in parallel; the third phase comprises a switch tube S5 and a switch tube S6 which are connected in series and are connected to the charging circuit in parallel; one end of the first winding is connected between the switch tube S1 and the switch tube S2; one end of the second winding is connected between the switch tube S3 and the switch tube S4; one end of the third winding is connected between the switch tube S5 and the switch tube S6, and the joint of the first winding, the second winding and the third winding is the central point of the motor. With the configuration, the motor controller is controlled by the main board to make corresponding changes according to different working states of the electric automobile. When the electric automobile runs, the switching tube S1, the switching tube S2, the switching tube S3, the switching tube S4, the switching tube S5 and the switching tube S6 are conducted to run in a PWM mode, and the motor controller and the motor still are in an original working mode; when the charging circuit is connected to the high-voltage direct-current output end of the direct-current charging seat, the switch tube S1, the switch tube S2, the switch tube S3, the switch tube S4, the switch tube S5 and the switch tube S6 are turned off, and the switch element K1 is turned off, so that a direct-current charging mode in which the direct-current charging seat is directly charged to the power supply is formed, that is, if the direct-current charging seat can support high-voltage direct-current output, the input current does not need to be boosted, and the direct-current charging mode for the power supply is formed through the control; when the charging circuit is connected to the low-voltage dc output terminal of the dc charging stand, and the output dc voltage is low, and voltage boosting is required, the control switch tube S1, the switch tube S2, the switch tube S3, the switch tube S4, the switch tube S5, and the switch tube S6 are turned on and the switch element K1 is turned on, and the PWM operation is in the Boost mode by the switch tube S1, the switch tube S2, the switch tube S3, the switch tube S4, the switch tube S5, and the switch tube S6, so as to form a voltage boosting circuit, and the low-voltage dc output from the low-voltage dc output terminal is boosted to the high-voltage dc and charges the power supply.
Preferably or optionally, the charging circuit may further comprise: the interface capacitor C1 is connected with the first phase in parallel on the charging circuit and is used for the original motor control function of the motor controller; one end of the switching element K0 is connected to a power supply, and the other end is connected to the interface capacitor C1.
Referring to fig. 2-4, further designs of the charging circuit are shown, respectively. In different embodiments, a scheme of parallel inductance or series inductance is added. For example, as shown in fig. 2, an inductor is added in series on each phase of the motor and the three-phase circuit; as shown in fig. 3, an inductor is added in series between the motor and the switching element K1; as shown in fig. 4, an inductor is added in series between the switching element K1 and the charging port, which can be used for filtering and increasing the energy pumping effect of the dc charging socket.
With the above charging circuit, referring to fig. 5, the power supply will be charged based on the following charging method:
s100: detecting the access state of the charging circuit connected with the DC charging seat, wherein the access state comprises the access relation and the access port
To control the switching element K1 and the switching tubes of the respective phases, the connection state of whether the charging circuit is connected to the dc charging stand is detected and determined at all times. For example, after the electric vehicle is controlled by the user to travel to the charging station and the charging head of the dc charging station is plugged, the connection relationship in the connected state is connected, and the connection relationship is not connected. The access port is a low-voltage or high-voltage port of the direct-current charging seat.
S200: when the access port is a high-voltage direct-current output end, the direct-current charging seat directly rushes towards the power supply;
when the DC charging seat connected with the charging circuit is a high-voltage DC output end, the DC charging seat can directly impact a power supply, and both sides of the DC charging seat meet the requirement of high-voltage charging.
S300: when the access port is a low-voltage direct-current output end, the switching element K1 is closed;
when the access port is detected to be the low-voltage direct-current output end, the switching element K1 is closed, and the booster circuit is started.
In the above embodiment, the access state of the charging circuit connected to the dc charging stand is detected, where the access state includes an access relationship and an access port, the access relationship includes access and non-access, and the access port includes a high-voltage charging port and a low-voltage charging port disposed on the dc charging stand.
Further preferably, when the access port is a high voltage dc output port, the step S200 of the dc charging socket directly rushing to the power supply includes:
the charging circuit is connected with the positive pole and the high-voltage negative pole of the DC charging seat in a plugging mode, the switch element K1 is disconnected, and the switch tube S1, the switch tube S2, the switch tube S3, the switch tube S4, the switch tube S5 and the switch tube S6 are disconnected.
When the access port is a low voltage dc output, the step S300 of closing the switching element K1 includes:
the charging circuit is connected with the positive electrode and the low-voltage negative electrode of the direct-current charging seat in a plugging mode, the switch element K1 is closed, and the switch tube S1, the switch tube S2, the switch tube S3, the switch tube S4, the switch tube S5 and the switch tube S6 are conducted.
That is, in the above embodiment, the low voltage output (500V) and the high voltage output (800V) of the DC charging stand share a common positive electrode.
It should be noted that the embodiments of the present invention have been described in terms of preferred embodiments, and not by way of limitation, and that those skilled in the art can make modifications and variations of the embodiments described above without departing from the spirit of the invention.
Claims (6)
1. The utility model provides an electric automobile high voltage direct current charging circuit, locates in the electric automobile, its characterized in that, charging circuit includes:
the power supply is arranged on the charging circuit;
the motor controller is connected in parallel with two ends of the power supply and comprises a first phase, a second phase and a third phase which form a three-phase circuit;
the motor comprises a first winding, a second winding and a third winding which form a three-phase winding, wherein the first winding, the second winding and the third winding are respectively connected with the first phase, the second phase and the third phase in parallel;
one end of the switching element K1 is connected with the joint of the first winding, the second winding and the third winding, and the other end is externally connected with a DC charging seat;
an interface capacitor C2, one end of which is connected to the switching element K1 and the other end of which is connected to a charging circuit;
when the dc charging base outputs the low-voltage dc power to the charging circuit, the switching element K1 is turned on, and the first phase, the second phase, and the third phase are turned on, so that the first phase, the second phase, and the third phase serve as a switching bridge arm of the boost circuit of the charging circuit, and the low-voltage dc power is boosted to the high-voltage dc power based on the energy extraction of the dc charging base.
2. The high-voltage direct-current charging circuit for electric vehicles according to claim 1,
the first phase comprises a switch tube S1 and a switch tube S2 which are connected in series and are connected to a charging circuit in parallel;
the second phase comprises a switch tube S3 and a switch tube S4 which are connected in series and are connected to a charging circuit in parallel;
the third phase comprises a switch tube S5 and a switch tube S6 which are connected in series and are connected to a charging circuit in parallel;
one end of the first winding is connected between the switch tube S1 and the switch tube S2;
one end of the second winding is connected between the switch tube S3 and the switch tube S4;
one end of the third winding is connected between the switch tube S5 and the switch tube S6;
the joint of the first winding, the second winding and the third winding is the central point of the motor;
when the electric automobile runs, the switching tube S1, the switching tube S2, the switching tube S3, the switching tube S4, the switching tube S5 and the switching tube S6 are conducted to run in a PWM mode;
when the charging circuit is connected to the high-voltage direct-current output end of the direct-current charging seat, the switch tube S1, the switch tube S2, the switch tube S3, the switch tube S4, the switch tube S5 and the switch tube S6 are turned off, and the switch element K1 is turned off, so that a charging mode that the direct-current charging seat is in direct impulse to the power supply is formed;
when the charging circuit is connected to the low-voltage dc output terminal of the dc charging stand, the switching tube S1, the switching tube S2, the switching tube S3, the switching tube S4, the switching tube S5, and the switching tube S6 are turned on, and the switching element K1 is turned on, so that the switching tube S1, the switching tube S2, the switching tube S3, the switching tube S4, the switching tube S5, and the switching tube S6 form a boosting circuit, and the low-voltage dc output from the low-voltage dc output terminal is boosted to a high-voltage dc to charge the power supply.
3. The high-voltage direct-current charging circuit for electric vehicles according to claim 1, characterized in that the charging circuit further comprises:
an interface capacitor C1 connected in parallel with the first capacitor on the charging circuit;
one end of the switching element K0 is connected to a power supply, and the other end is connected to the interface capacitor C1.
4. The high-voltage direct-current charging method for the electric automobile is applied to the charging circuit of any one of claims 1 to 3, and is characterized by comprising the following steps of:
detecting the access state of the charging circuit connected with the direct current charging seat, wherein the access state comprises an access relation and an access port;
when the access port is a high-voltage direct-current output end, the direct-current charging seat directly rushes towards the power supply;
when the access port is a low-voltage direct-current output end, the switching element K1 is closed.
5. The HVDC charging method for the electric vehicle according to claim 4, wherein the detecting step detects an access state of the charging circuit connected to the DC charging base, the access state includes an access relation and an access port, the access relation includes access and non-access, and the access port includes a high-voltage charging port and a low-voltage charging port provided on the DC charging base.
6. The high-voltage direct-current charging method for the electric automobile according to claim 4,
when the access port is the high-voltage direct-current output end, the step that the direct-current charging seat directly rushes towards the power supply comprises the following steps:
the charging circuit is connected with the positive pole and the high-voltage negative pole of the direct-current charging seat in a plugging mode, the switch element K1 is disconnected, and the switch tube S1, the switch tube S2, the switch tube S3, the switch tube S4, the switch tube S5 and the switch tube S6 are disconnected;
when the access port is a low-voltage direct-current output end, the step of closing the switching element K1 comprises the following steps:
the charging circuit is connected with the positive electrode and the low-voltage negative electrode of the direct-current charging seat in a plugging mode, the switch element K1 is closed, and the switch tube S1, the switch tube S2, the switch tube S3, the switch tube S4, the switch tube S5 and the switch tube S6 are conducted.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111131474.6A CN113872284A (en) | 2021-09-26 | 2021-09-26 | High-voltage direct-current charging circuit and charging method for electric automobile |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111131474.6A CN113872284A (en) | 2021-09-26 | 2021-09-26 | High-voltage direct-current charging circuit and charging method for electric automobile |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116252648A (en) * | 2023-05-16 | 2023-06-13 | 蔚来动力科技(合肥)有限公司 | Circuit for charging vehicle and vehicle comprising same |
| US11901757B2 (en) | 2022-03-09 | 2024-02-13 | Contemporary Amperex Technology Co., Limited | Electric vehicle battery voltage regulation system and control method and control apparatus therefor |
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2021
- 2021-09-26 CN CN202111131474.6A patent/CN113872284A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11901757B2 (en) | 2022-03-09 | 2024-02-13 | Contemporary Amperex Technology Co., Limited | Electric vehicle battery voltage regulation system and control method and control apparatus therefor |
| CN116252648A (en) * | 2023-05-16 | 2023-06-13 | 蔚来动力科技(合肥)有限公司 | Circuit for charging vehicle and vehicle comprising same |
| CN116252648B (en) * | 2023-05-16 | 2023-09-22 | 蔚来动力科技(合肥)有限公司 | Circuit for charging vehicle and vehicle comprising same |
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