CN112706643A - Charging current control method and wireless charging system of electric automobile - Google Patents

Charging current control method and wireless charging system of electric automobile Download PDF

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Publication number
CN112706643A
CN112706643A CN202011554848.0A CN202011554848A CN112706643A CN 112706643 A CN112706643 A CN 112706643A CN 202011554848 A CN202011554848 A CN 202011554848A CN 112706643 A CN112706643 A CN 112706643A
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current
constraint condition
charging current
control parameter
wireless charging
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CN112706643B (en
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刘玮
罗勇
胡超
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Zhongxing New Energy Technology Co ltd
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Zhongxing New Energy Technology Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/60—Monitoring or controlling charging stations
    • B60L53/62—Monitoring or controlling charging stations in response to charging parameters, e.g. current, voltage or electrical charge
    • 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
    • B60L53/10—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 the energy transfer between the charging station and the vehicle
    • B60L53/12—Inductive energy transfer
    • 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
    • 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
    • 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
    • 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 discloses a charging current control method and a wireless charging system of an electric automobile, wherein the charging current control method comprises the following steps: acquiring a constraint condition of a control parameter D of a secondary side controllable full-bridge rectification circuit; acquiring a required charging current and a current charging current of the wireless charging system, and matching the current charging current with the required charging current; when the current charging current is not matched with the required charging current and the control parameter D of the secondary controllable full-bridge rectifying circuit is adjusted each time, and the control parameter D of the secondary controllable full-bridge rectifying circuit meets the constraint condition, gradually adjusting the control parameter D of the secondary controllable full-bridge rectifying circuit until the current charging current is consistent with the required charging current; the invention realizes the constraint control of the control parameter D and the constraint control of the charging current, and is beneficial to improving the charging efficiency and the safety of the wireless charging system of the electric automobile.

Description

Charging current control method and wireless charging system of electric automobile
Technical Field
The invention relates to the technical field of wireless charging, in particular to a charging current control method and a wireless charging system of an electric vehicle.
Background
The application of the wireless charging technology in the field of electric automobiles is gradually popularized, and in practical application, as the position between ground equipment and vehicle-mounted equipment is in an undetermined state along with a parking state, and an automobile chassis can also change within a certain range along with the loading state in an automobile, the horizontal offset distance and the vertical distance (ground clearance) between a primary coil and a secondary coil of a wireless charging system in the electric automobile can change within a certain range; secondly, in the whole process of automobile charging, the requirement on charging voltage is changed dynamically, so that the wireless charging system needs to regulate the output current of the output system according to the requirement on the automobile charging current.
The key to adjusting the output current of the output system is to constrain the control quantity of the secondary side, and the current constraint condition is usually calibrated by an experimental method. Due to more control combinations, the method has large workload and lacks theoretical support, sometimes some working conditions are omitted to cause that the constraint condition setting is not correct, or in order to pursue that all the working conditions are constrained simply by one constraint condition, or in order to pursue that the constraint condition setting is too harsh, the schemes can reduce the performance of the system.
Disclosure of Invention
The invention mainly aims to provide a charging current control method, which is used for a wireless charging system of an electric automobile, wherein the wireless charging system of the electric automobile comprises a primary side system, a loose coupling transformer and a secondary side controllable full bridge rectifying circuit, and the charging current control method comprises the following steps:
acquiring a first constraint condition, a second constraint condition and a third constraint condition of a control parameter D of the secondary side controllable full-bridge rectification circuit;
acquiring a required charging current and a current charging current of the wireless charging system, and matching the current charging current with the required charging current;
at present charging current with demand charging current does not match, and at every regulation secondary controllable full-bridge rectifier circuit's control parameter D in-process, when adjusting secondary controllable full-bridge rectifier circuit's control parameter D satisfies first constraint condition, second constraint condition and third constraint condition simultaneously, adjusts one by one secondary controllable full-bridge rectifier circuit's control parameter D, in order to adjust current charging current, until current charging current with demand charging current is unanimous.
Optionally, after the step of obtaining a required charging current and a current charging current of the wireless charging system and matching the current charging current with the required charging current, the charging current control method further includes:
when the current charging current is not matched with the required charging current and the control parameter D of the secondary controllable full-bridge rectifying circuit is regulated at any time, and the regulated control parameter D of the secondary controllable full-bridge rectifying circuit does not meet any one of a first constraint condition, a second constraint condition and a third constraint condition, the required current value of the primary coil output to the primary side system is regulated to control the primary side system to regulate the current charging current so that the current charging current is consistent with the required charging current.
Optionally, the step of obtaining the first constraint condition, the second constraint condition, and the third constraint condition of the control parameter D of the secondary-side controllable full-bridge rectifier circuit specifically includes:
acquiring a constraint condition of a primary coil current of the loosely coupled transformer;
and acquiring a first constraint condition of the control parameter D of the secondary controllable full-bridge rectification circuit according to the mapping relation between the current of the primary coil of the loosely coupled transformer and the control parameter D of the secondary controllable full-bridge rectification circuit.
Optionally, the step of obtaining the constraint condition of the current of the primary coil of the loosely coupled transformer includes:
acquiring the output power, the secondary side efficiency, the primary side compensation inductance value and the primary side self-inductance value of the loosely coupled transformer of the wireless charging system;
according to the obtained output power, the secondary side efficiency, the primary side compensation inductance and the primary side self-inductance value of the loosely coupled transformer of the wireless charging system, calculating the constraint condition of the primary side coil current of the loosely coupled transformer under the constraint condition that the primary side inverter current of the wireless charging system takes the maximum value through the following formula:
Figure BDA0002855952390000021
wherein f is the operating frequency of the wireless charging system, PoutOutput power for the wireless charging system, Lp_maxIs the maximum value of the primary side self-inductance, L, of the loosely coupled transformerp_minIs the primary side self-inductance minimum, L, of the loosely coupled transformer1Compensating inductance of the primary side of the wireless charging system, wherein eta is vehicle-mounted side efficiency of the wireless charging system, iinIs the primary side inverter current of the wireless charging system, IpThe primary coil current of the loosely coupled transformer is represented by beta, and the secondary impedance angle of the wireless charging system is represented by beta.
Optionally, the step of obtaining the first constraint condition, the second constraint condition, and the third constraint condition of the control parameter D of the secondary-side controllable full-bridge rectifier circuit specifically includes:
acquiring a constraint condition of a secondary side impedance angle of the secondary side controllable full-bridge rectification circuit;
according to the mapping relation between the secondary side impedance angle of the secondary side controllable full-bridge rectification circuit and the control parameter D; and acquiring a second constraint condition of a control parameter D of the secondary side controllable full-bridge rectification circuit.
Optionally, the step of obtaining a constraint condition of a secondary side impedance angle of the secondary side controllable full-bridge rectification circuit includes:
acquiring the output power, the secondary side efficiency, the primary side compensation inductance value and the primary side self-inductance value of the loosely coupled transformer of the wireless charging system;
calculating the constraint condition of the secondary impedance angle of the secondary controllable full-bridge rectification circuit under the constraint condition that the primary inverter current of the wireless charging system takes the maximum value according to the acquired output power, the secondary efficiency, the primary compensation inductance and the primary self-inductance value of the loosely coupled transformer of the wireless charging system; specifically, the calculation is performed by the following formula:
Figure BDA0002855952390000031
wherein f is the operating frequency of the wireless charging system, PoutOutput power for the wireless charging system, Lp_maxIs the maximum value of the primary side self-inductance, L, of the loosely coupled transformerp_minIs the primary side self-inductance minimum, L, of the loosely coupled transformer1Compensating inductance of the primary side of the wireless charging system, wherein eta is vehicle-mounted side efficiency of the wireless charging system, iinIs the primary side inverter current of the wireless charging system, IpThe primary coil current of the loosely coupled transformer is represented by beta, and the secondary impedance angle of the wireless charging system is represented by beta.
Optionally, the obtaining of the first constraint condition, the second constraint condition, and the third constraint condition of the control parameter D of the secondary-side controllable full-bridge rectifier circuit specifically includes:
acquiring a constraint condition of the input current of the secondary side controllable full-bridge rectification circuit;
and acquiring the maximum constraint value of the third constraint condition of the control parameter D of the secondary side controllable full-bridge rectification circuit according to the mapping relation between the input current of the secondary side controllable full-bridge rectification circuit and the control parameter D.
Optionally, the obtaining a first constraint condition, a second constraint condition, and a third constraint condition of the control parameter D of the secondary-side controllable full-bridge rectifier circuit specifically further includes:
acquiring a constraint condition of secondary side coil current;
and acquiring the minimum constraint value of the third constraint condition of the control parameter D of the secondary controllable full-bridge rectification circuit according to the mapping relation between the secondary coil current and the control parameter D of the secondary controllable full-bridge rectification circuit.
Optionally, the charging current control method further includes:
and determining the equivalent impedance of the secondary controllable full-bridge rectification circuit to determine the working mode of the secondary controllable full-bridge rectification circuit.
The invention also provides a wireless charging system of the electric automobile, which comprises a memory, a processor, a program of a charging current control method stored on the memory and capable of running on the processor, and a primary side full-bridge inverter circuit, a loose coupling transformer and a secondary side full-bridge rectifier circuit which are electrically connected in sequence, wherein the program of the charging current control method of the wireless charging system is executed by the processor to realize the steps of the charging current control method.
According to the technical scheme, the required charging current and the current charging current of the wireless charging system are obtained by obtaining a first constraint condition, a second constraint condition and a third constraint condition of a control parameter D of the secondary side controllable full-bridge rectifying circuit, and the current charging current is matched with the required charging current; when the current charging current is matched with the required charging current, the control parameter D of the secondary side controllable full-bridge rectifying circuit is kept unchanged, when the current charging current is not matched with the required charging current and in the process of adjusting the control parameter D of the secondary side controllable full bridge rectifying circuit each time, when the adjusted control parameter D of the secondary side controllable full-bridge rectification circuit simultaneously meets a first constraint condition, a second constraint condition and a third constraint condition, the control parameter D of the secondary side controllable full-bridge rectification circuit is adjusted gradually, so as to adjust the current charging current until the current charging current is consistent with the required charging current, the invention limits the change of the control parameter D of the secondary side controllable full bridge rectification circuit, therefore, the safety of the wireless charging system of the electric automobile is higher, and the reliability and controllability of the wireless charging system of the electric automobile are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic flow chart illustrating a charging current control method according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of an embodiment of a wireless charging system for an electric vehicle according to the present invention;
FIG. 3 is a waveform diagram of a midpoint voltage Ve and an input current Ie of a secondary side full-bridge controllable rectification circuit of the wireless charging system of the electric vehicle according to the invention;
FIG. 4 is a flowchart of obtaining a first constraint condition of a controllable full-bridge rectifier circuit according to the charging current control method of the present invention;
FIG. 5 is a flowchart of obtaining a second constraint condition of the controllable full-bridge rectifier circuit according to the charging current control method of the present invention;
FIG. 6 is a flowchart of obtaining a maximum constraint value of a third constraint condition of the controllable full-bridge rectifier circuit according to the charging current control method of the present invention;
fig. 7 is a flowchart of obtaining a minimum constraint value of a third constraint condition of the controllable full-bridge rectifier circuit in the charging current control method according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
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.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The charging current control method provided by the invention can control the charging current of the wireless charging system of the electric automobile, and is beneficial to improving the reliability and controllability of the wireless charging system of the electric automobile.
Referring to fig. 1, in an embodiment, the charging current control method is used in a wireless charging system of an electric vehicle, where the wireless charging system of the electric vehicle includes a primary side system, a loosely coupled transformer, and a secondary side controllable full-bridge rectifier circuit, and the charging current control method includes:
step S10, acquiring a control parameter D of the secondary side controllable full-bridge rectification circuit; first constraint (D)min1，Dmax1) Second constraint (D)min2，Dmax2) And a third constraint (D)min3，Dmax3)；
Step S20, acquiring a required charging current and a current charging current of the wireless charging system, and matching the current charging current with the required charging current;
step S30, when the current charging current is not matched with the required charging current and the control parameter D of the secondary side controllable full bridge rectification circuit is adjusted each time, the adjusted control parameter D of the secondary side controllable full bridge rectification circuit simultaneously meets a first constraint condition (D)min1，Dmax1) Second constraint (D)min2，Dmax2) And a third constraint (D)min3，Dmax3) And when the current charging current is consistent with the required charging current, gradually adjusting the control parameter D of the secondary side controllable full-bridge rectification circuit to adjust the current charging current.
It should be noted that, the circuit structure of the wireless charging system for an electric vehicle is shown in fig. 2, fig. 2 is the circuit structure of the wireless charging system for an electric vehicle, in fig. 2, the infrastructure side is the primary side system (also the primary side of the loose coupling transformer) of the wireless charging system for an electric vehicle, the vehicle side is the secondary side (also the secondary side of the loose coupling transformer) of the wireless charging system for an electric vehicle, and L is the secondary side of the wireless charging system for an electric vehiclepBeing the primary winding of a loosely coupled transformer, LsBeing secondary windings of loosely coupled transformers, IpPrimary winding current of loosely coupled transformer, IsFor the secondary winding current of the loosely coupled transformer (when it is noted that the capital letter I described herein may refer to an effective value of the current, but may also refer to other meanings, and is not limited herein), the primary winding and the secondary winding of the loosely coupled transformer are respectively a transmitting device and a receiving device for energy, and M is a mutual inductance value of the primary winding and the secondary winding of the loosely coupled transformer. Primary side compensation inductance L1Primary side compensation capacitor C1And a primary side series compensation capacitor CpThe primary side resonant circuits of the loosely coupled transformer are formed together; secondary side compensation inductance L2Secondary side compensating capacitor C2And a secondary side series compensation capacitor CsSecondary resonant circuit, negative, jointly forming a loosely coupled transformerThe active power of the energy transmission of the loosely coupled transformer is increased; switch tube Qp1And a switching tube Qp2And a switching tube Qp3And a switching tube Qp4The primary side full-bridge inverter circuit which jointly forms the loosely coupled transformer is responsible for converting an accessed direct-current power supply into a high-frequency power supply, namely primary side inverter current, and it is required to be noted that the maximum current which can be borne by a device, namely the maximum value of the primary side inverter current; switch tube Qs1And a switching tube Qs2And a switching tube Qs3And a switching tube Qs4The secondary controllable full-bridge rectifier circuit jointly forms a loosely coupled transformer, is responsible for rectifying a high-frequency power supply converted by the primary full-bridge inverter circuit, and simultaneously adjusts the output current Iout of the loosely coupled transformer, and the input current of the secondary controllable full-bridge rectifier circuit is IeAt a midpoint voltage of VeEquivalent resistance Re＝Ve/Ie。
Wherein the first constraint condition (D) of the control parameter D of the secondary side controllable full-bridge rectification circuitmin1，Dmax1) Second constraint (D)min2，Dmax2) And a third constraint (D)min3，Dmax3) The obtaining of the secondary side impedance angle may specifically be according to a plurality of influencing control parameters D, or constraint conditions of parameters influenced by the control parameters D, and a mapping relationship between the influencing control parameters D or the parameters influenced by the control parameters D and the control parameters D, where the influencing control parameters D, or the parameters influenced by the control parameters D may be primary side inverter current, primary side coil current, secondary side impedance angle, and the like.
In this embodiment, the control parameter D of the secondary-side controllable full-bridge rectifier circuit may be a duty ratio of the secondary-side controllable full-bridge rectifier circuit, or a phase-shift angle of the secondary-side controllable full-bridge rectifier circuit; of course, other control parameters are also possible, and are not limited herein. In the present embodiment, the control parameter D of the secondary controllable full-bridge rectifier circuit is taken as the duty ratio of the secondary controllable full-bridge rectifier circuit as an example for explanation. As shown in fig. 3, wherein fig. 3(a) is the midpoint voltage V of the conventional uncontrolled rectificationeInput current IeWaveform, referring to fig. 3(b), fig. 3(b) is a wireless charging system for electric vehicle of the present inventionThe secondary side controllable full-bridge rectifier circuit works in a capacitive mode, and the phase of the input current Ie and the phase of the middle point voltage Ve are equal to D/2. Further, referring to fig. 3(c), fig. 3(c) shows waveforms of the operating midpoint voltage Ve and the input current Ie in another operating mode of the secondary controllable full-bridge rectifier circuit of the wireless charging system for an electric vehicle according to the present invention, where the phase of the input current Ie in this operating mode lags behind the zero-crossing point of the fundamental wave of the midpoint voltage Ve, and therefore, when the secondary controllable full-bridge rectifier circuit operates in the inductive mode, the phase of the input current Ie and the midpoint voltage Ve is θ ═ D/2.
In conclusion, by adjusting the duty ratio D of the different secondary-side controllable full-bridge rectifier circuits, the real part and the imaginary part of the equivalent impedance can be adjusted, that is, the secondary-side impedance Zs and the secondary-side impedance angle β can be adjusted, so that the current charging current can be adjusted, and the current charging current is consistent with the required charging current. It should be noted that, when the control parameter D is the phase shift angle of the secondary-side controllable full-bridge rectifier circuit, the specific adjustment mode is the same as the mode of adjusting the duty ratio of the secondary-side controllable full-bridge rectifier circuit, the working principle is the same, and the achieved technical effect is the same. It should be noted that, in practical application, the duty ratio and the phase shift angle of the secondary controllable full-bridge rectifier circuit may also be adjusted at the same time to adjust the output current, which is specifically set according to practical application, and is not limited herein.
In practical application, the BMS module of the battery car outputs a required charging current to the wireless charging system of the electric car, the current wireless charging system of the electric automobile can obtain the current charging current of the wireless charging system of the electric automobile through an ammeter, a sampling circuit and the like, judge whether the current charging current is matched with the required charging current or not, when the current charging current is not matched with the required charging current, the control parameter D is adjusted, taking the control parameter D of the secondary controllable full-bridge rectification circuit as the duty ratio of the secondary controllable full-bridge rectification circuit as an example for explanation, the duty cycle of the secondary-side controllable full-bridge rectifier circuit can be reduced to increase the present charging current when the present charging current is less than the required charging current, when the current charging current is larger than the required charging current, the duty ratio of the secondary side controllable full-bridge rectifying circuit can be increased so as to reduce the current charging current.
In addition, in practical applications, only the first constraint condition (D) of the control parameter D of the secondary-side controllable full-bridge rectifier circuit may be usedmin1，Dmax1) Second constraint (D)min2，Dmax2) And a third constraint (D)min3，Dmax3) The control parameter D of the secondary side controllable full-bridge rectifier circuit is constrained, but not limited thereto, and in this embodiment, the first constraint condition (D) of the control parameter D of the secondary side controllable full-bridge rectifier circuit may be setmin1，Dmax1) Second constraint (D)min2，Dmax2) And a third constraint (D)min3，Dmax3) (ii) a Integrating through a first preset formula to obtain a product satisfying a first constraint condition (D)min1，Dmax1) Second constraint (D)min2，Dmax2) And a third constraint (D)min3，Dmax3) Constraint condition of control parameter D of secondary side controllable full bridge rectification circuit (D)min，Dmax) (ii) a It will be appreciated that the constraint (D) is satisfied as long as the control parameter D of the secondary-side controllable full-bridge rectifier circuit satisfies this constraintmin，Dmax) That is, the first constraint condition (D) of the control parameter D of the secondary side controllable full bridge rectification circuit is satisfied simultaneouslymin1，Dmax1) Second constraint (D)min2，Dmax2) And a third constraint (D)min3，Dmax3)；。
Wherein the first preset formula is as follows:
Figure BDA0002855952390000091
wherein D ismaxFor the secondary controllable full-bridge rectification circuitOf the control parameter D, DminIs the minimum constraint value of the control parameter D of the secondary side controllable full bridge rectification circuitmax1A first constraint (D) for a control parameter D of the secondary-side controllable full-bridge rectifier circuitmin1，Dmax1) Maximum constraint value of Dmin1A first constraint (D) for a control parameter D of the secondary-side controllable full-bridge rectifier circuitmin1，Dmax1) Minimum constraint value of Dmax2A second constraint (D) being a control parameter D of said secondary controllable full-bridge rectifier circuitmin2，Dmax2) Maximum constraint value of Dmin2A second constraint (D) being a control parameter D of said secondary controllable full-bridge rectifier circuitmin2，Dmax2) Minimum constraint value of Dmax3A third constraint condition (D) being a control parameter D of the secondary side controllable full-bridge rectifier circuitmin3，Dmax3) Maximum constraint value of Dmin3A third constraint condition (D) being a control parameter D of the secondary side controllable full-bridge rectifier circuitmin3，Dmax3) Is determined.
The constraint condition of the control parameter D of the conventional secondary-side controllable full-bridge rectification circuit is usually calibrated by an experimental method. Due to more control combinations, the method has large workload and lacks theoretical support, and sometimes, omission of some working conditions causes incorrect setting of constraint conditions, changes of control parameters and excessive primary side inverter current of the wireless charging system of the electric automobile, and causes burning of equipment on the infrastructure side, or one constraint condition is used for constraining all working conditions simply for pursuing, or the constraint condition is set too harsh for pursuing safety, and the schemes can reduce the performance of the system.
The technical scheme of the invention obtains a first constraint condition (D) of a control parameter D of the secondary side controllable full-bridge rectification circuitmin1，Dmax1) Second constraint (D)min2，Dmax2) And a third constraint (D)min3，Dmax3) Acquiring the required charging current and the current charging current of the wireless charging system, and comparing the current charging current with the current charging currentMatching the required charging current; when the current charging current is matched with the required charging current, the control parameter D of the secondary controllable full-bridge rectification circuit is maintained to be unchanged, the current charging current is not matched with the required charging current, and in the process of adjusting the control parameter D of the secondary controllable full-bridge rectification circuit every time, the adjusted control parameter D of the secondary controllable full-bridge rectification circuit simultaneously meets a first constraint condition (D)min1，Dmax1) Second constraint (D)min2，Dmax2) And a third constraint (D)min3，Dmax3) And when the current charging current is consistent with the required charging current, the problem that the system performance is reduced due to unreasonable setting of the current constraint condition is solved. The wireless charging system of the electric automobile runs in a safe range, impact on ground equipment is avoided, and reliability and controllability of the wireless charging system of the electric automobile are improved.
Further, after the step of obtaining a required charging current and a current charging current of the wireless charging system and matching the current charging current with the required charging current, the charging current control method further includes:
when the current charging current is not matched with the required charging current and the control parameter D of the secondary controllable full-bridge rectifying circuit is regulated at any time, the regulated control parameter D of the secondary controllable full-bridge rectifying circuit does not satisfy a first constraint condition (D)min1，Dmax1) Second constraint (D)min2，Dmax2) And a third constraint (D)min3，Dmax3) And when the current value is any one of the current values, the current value of the required current output to the primary coil of the primary system is adjusted to control the primary system to adjust the current charging current so that the current charging current is consistent with the required charging current.
In order to realize safe and stable operation of the wireless charging system of the electric automobile, information interaction can be carried out between the infrastructure side and the vehicle-mounted side, and specifically, the vehicle-mounted side outputs the primary coil current I of the loose coupling transformer through wireless communicationpThe required value is sent to the basic building side, and the basic building side receives the primary coil current I of the loosely coupled transformerpRegulating the current I of the primary winding of a loosely coupled transformerpSo that the primary winding current I of the loosely coupled transformer ispThe actual value is consistent with the required value, and the primary coil current I of the loosely coupled transformer is measuredpIs output to the vehicle-mounted side by wireless communication, that is, for the secondary side of the wireless communication system, the primary coil current I of the loosely coupled transformerpBoth the actual value and the required value of (c) are known parameters.
When the control mode is determined, the primary coil current IpAnd the control parameter D of the secondary controllable full-bridge rectification circuit is the main control quantity of the primary side and the secondary side of the wireless charging system respectively, and the output current I of the wireless charging systemoutMay be represented by a second predetermined formula, which is as follows:
Iout＝f1(Ip,D)；
wherein, IoutOutput current, i.e. present charging current, I for a wireless charging system of an electric vehiclepThe current of a primary coil of the loosely coupled transformer is adopted, and D is a control parameter D of the secondary full-bridge controllable rectifying circuit.
The current charging current is not matched with the required charging current, and the control parameter D of the secondary full-bridge controllable rectifying circuit is equal to the constraint value of the constraint condition, that is, when the control parameter D of the secondary full-bridge controllable rectifying circuit is equal to the maximum value or the minimum value of the constraint condition, at this moment, the control parameter D of the secondary full-bridge controllable rectifying circuit cannot be continuously adjusted, the primary coil current I of the loosely coupled transformer output to the infrastructure side by the vehicle-mounted side is adjusted in the embodimentpTo regulate the primary winding current I of the loosely coupled transformerpThen adjust the current output of the wireless charging system of the electric vehicleA charging current such that the present charging current coincides with the demanded charging current.
Further, the charging current control method further includes:
determining the equivalent impedance of the secondary controllable full-bridge rectification circuit to determine the working mode of the secondary controllable full-bridge rectification circuit; in practical application, the working equivalent impedance of the secondary side controllable full-bridge rectification circuit comprises an imaginary part and a real part, and the working mode of the secondary side controllable full-bridge rectification circuit can be determined according to the value of the imaginary part. And then the duty ratio or the phase-shifting angle of the secondary side controllable full-bridge rectification circuit can be controlled according to the working mode of the secondary side full-bridge controllable rectification circuit.
Referring to fig. 4, in an embodiment, the first constraint condition (D) of the control parameter D of the secondary-side controllable full-bridge rectifier circuit is obtainedmin1，Dmax1) Second constraint (D)min2，Dmax2) And a third constraint (D)min3，Dmax3) The method specifically comprises the following steps:
obtaining a primary coil current I of the loosely coupled transformerpThe constraint of (2);
according to the primary coil current I of the loosely coupled transformerpAnd a mapping relation of the control parameter D of the secondary side controllable full-bridge rectification circuit, and acquiring a first constraint condition (D) of the control parameter D of the secondary side controllable full-bridge rectification circuitmin1，Dmax1)。
In this embodiment, the primary winding current I is determined after the control mode is determinedpAnd the control parameter D of the secondary controllable full-bridge rectification circuit is the main control quantity of the primary side and the secondary side of the wireless charging system respectively, and the output current I of the wireless charging systemoutMay be represented by a third predetermined formula, which is as follows:
Iout＝f1(Ip,D)；
wherein, IoutOutput current, i.e. present charging current, I for a wireless charging system of an electric vehiclepFor the current of the primary coil of the loosely coupled transformer, and D for the control of the secondary full-bridge controllable rectification circuitAnd D, parameter D.
In order to regulate the present charging current IoutThe current I of the primary coil of the loosely coupled transformer can be adjusted by matching with the required charging current valuepOr the control parameter D of the secondary side full-bridge controllable rectification circuit for a present charging current IoutThere will be no array one-to-one primary coil current IpAnd the control parameter D of the secondary side controllable full-bridge rectification circuit is satisfied.
Further, a primary coil current I is obtainedpThe specific steps of the constraint of (2) include:
acquiring the output power, the secondary side efficiency, the primary side compensation inductance value and the primary side self-inductance value of the loosely coupled transformer of the wireless charging system;
calculating the constraint condition of the primary coil current Ip according to the acquired output power, the secondary efficiency, the primary compensation inductance, the primary self-inductance value of the loosely coupled transformer and a fourth preset formula, wherein the fourth preset formula is as follows:
Figure BDA0002855952390000121
wherein iinIs the primary side inverter current, L, of the loosely coupled transformerp_maxIs the maximum value of the primary side self-inductance, L, of the loosely coupled transformerp_minIs the primary side self-inductance minimum, L, of the loosely coupled transformer1Compensating the primary side of the loosely coupled transformer for an inductance, PoutThe output power of the wireless charging system of the electric automobile is the f, the working frequency of the wireless charging system of the electric automobile is the eta, the secondary efficiency of the loose coupling transformer is the eta, and the IpIs the primary coil current of the loosely coupled transformer, and beta is the secondary impedance angle of the loosely coupled transformer.
The right variable of the fourth preset formula is mainly the primary coil current IpAnd a secondary impedance angle beta, and further, the primary side inverter current i of the loosely coupled transformer can be constrainedinIs a maximum value Iin_maxThen can pass throughThe above formula obtains the maximum value I of the primary side inverter currentin_maxUnder the constraint of (2), primary coil current IpThe constraint condition of (2) and the constraint condition of the secondary impedance angle are as shown in a fifth preset formula:
Figure BDA0002855952390000122
by synthesizing the third preset formula, the fourth preset formula and the fifth preset formula, the constraint conditions of the current charging current are as follows:
Iout＝f1(Ip_min，Dmin1)＝f1(Ip_max，Dmax1)；
from the above formula, the current I of the primary coil can be obtainedpUnder the constraint condition (D), a first constraint condition (D) of a control parameter D of the secondary side controllable full-bridge rectification circuitmin1，Dmax1)。
The embodiment calculates a first constraint condition (D) of a control parameter D of the secondary side controllable full-bridge rectification circuitmin1，Dmax1) And furthermore, the control parameter D of the secondary controllable full-bridge rectifier circuit can be restrained, so that the control parameter D of the secondary controllable full-bridge rectifier circuit of the wireless charging system of the electric automobile cannot exceed the restraint range, the electric automobile can work safely, stably and reliably, the control parameter D of the secondary controllable full-bridge rectifier circuit can be controlled, the current charging current is adjusted, and the current charging current meets the requirements of the BMS of the electric automobile.
Referring to fig. 5, in an embodiment, the first constraint condition (D) of the control parameter D of the secondary-side controllable full-bridge rectifier circuit is obtainedmin1，Dmax1) Second constraint (D)min2，Dmax2) And a third constraint (D)min3，Dmax3) The method specifically comprises the following steps:
acquiring a constraint condition of a secondary side impedance angle of the secondary side controllable full-bridge rectification circuit;
according to the secondary side impedance angle of the secondary side controllable full-bridge rectification circuit and the mapping of the control parameter DA shooting relationship; obtaining a second constraint condition (D) of a control parameter D of the secondary side controllable full-bridge rectification circuitmin2，Dmax2)。
Specifically, the specific step of obtaining the constraint condition of the secondary impedance angle includes:
acquiring the output power, the secondary side efficiency, the primary side compensation inductance value and the primary side self-inductance value of the loosely coupled transformer of the wireless charging system;
calculating a constraint condition of an impedance angle of a secondary side according to the obtained output power, the secondary side efficiency, the primary side compensation inductance value, the primary side self-inductance value of the loosely coupled transformer and a sixth preset formula, wherein the sixth preset formula is as follows:
Figure BDA0002855952390000131
wherein iinIs the primary side inverter current, L, of the loosely coupled transformerp_maxIs the maximum value of the primary side self-inductance, L, of the loosely coupled transformerp_minIs the primary side self-inductance minimum, L, of the loosely coupled transformer1Compensating the primary side of the loosely coupled transformer for an inductance, PoutThe output power of the wireless charging system of the electric automobile is the f, the working frequency of the wireless charging system of the electric automobile is the eta, the secondary efficiency of the loose coupling transformer is the eta, and the IpIs the primary coil current of the loosely coupled transformer, and beta is the secondary impedance angle of the loosely coupled transformer.
The right variable of the sixth preset formula is mainly the primary coil current IpAnd a secondary impedance angle beta, and further, the primary side inverter current i of the loosely coupled transformer can be constrainedinIs a maximum value Iin_maxThen the maximum value I of the primary side inversion current can be obtained by the formulain_maxUnder the constraint of (2), primary coil current IpThe constraint condition of (2) and the constraint condition of the secondary impedance angle are as shown in a seventh preset formula:
Figure BDA0002855952390000132
it should be noted that, after the control mode, the compensation parameter, and the system output voltage/current/power of the wireless charging system of the electric vehicle are determined, the secondary impedance angle is determined by the control parameter D of the secondary controllable full-bridge rectifier circuit, specifically referring to the eighth preset formula:
β＝f2(D)
by synthesizing the sixth preset formula, the seventh preset formula and the eighth preset formula, the following results are obtained:
Figure BDA0002855952390000141
the second constraint condition (D) of the control parameter D of the secondary side controllable full-bridge rectification circuit under the constraint condition of the secondary side impedance angle beta can be obtained by the formulamin2，Dmax2)。
The embodiment calculates the second constraint condition (D) of the control parameter D of the secondary side controllable full-bridge rectification circuitmin2，Dmax2) Furthermore, the control parameter D of the secondary side controllable full-bridge rectification circuit can be restrained to control the stable operation of the wireless charging system of the electric automobile, so that the wireless charging system of the electric automobile operates in a safe range, the impact on ground equipment is avoided, and the reliability of the wireless charging system of the electric automobile is improved.
The constraint of the secondary impedance angle β may be converted to constrain the cosine of the secondary impedance angle β, as shown in the following equation:
cos(β)≥PFmin
and the PF is a secondary side power PF value of the wireless charging system.
It should be noted that, in engineering applications, the secondary impedance angle β can be calculated by the following formula:
Figure BDA0002855952390000142
wherein, PoutFor the current output power, η is the secondary efficiency, IsIs the effective value of the secondary coil current, IpIs primary coil current IpAnd the effective value, M is the current mutual inductance value, and f is the system working frequency.
Referring to fig. 6, in an embodiment, the first constraint condition (D) of the control parameter D of the secondary-side controllable full-bridge rectifier circuit is obtainedmin1，Dmax1) Second constraint (D)min2，Dmax2) And a third constraint (D)min3，Dmax3) The method specifically comprises the following steps:
acquiring a constraint condition of an input current Ie of the secondary side controllable full-bridge rectification circuit;
obtaining a third constraint condition (D) of the control parameter D of the secondary side controllable full-bridge rectification circuit according to the mapping relation between the input current Ie of the secondary side controllable full-bridge rectification circuit and the control parameter Dmin3，Dmax3) Is determined.
It can be understood that, when the control mode of the wireless charging system of the electric vehicle and the parameters of the secondary-side resonant network are determined, the control parameters of the secondary-side controllable full-bridge rectifier circuit and the input current, the front charging current and the front charging current can be represented by the following formula:
Ie＝f3(Iout,D)
in order to regulate the present charging current IoutAnd the input current of the secondary controllable full-bridge rectification circuit and the control parameter D of the secondary controllable full-bridge rectification circuit which are not in one-to-one correspondence with the required charging current value are matched.
Further, the constraint condition of the input current of the secondary side controllable full-bridge rectification circuit can be obtained, and the constraint condition of the input current of the secondary side controllable full-bridge rectification circuit can be obtained by:
Ie_max＝f3(Iout,Dmax3)
wherein, Ie_maxIs the maximum value of the input current of the secondary side controllable full-bridge rectification circuit, Dmax3(iii) a third constraint for a control parameter D of the secondary-side controllable full-bridge rectifier circuitDmin3，Dmax3) Is determined.
Further, the first constraint condition (D) of the control parameter D of the secondary side controllable full bridge rectification circuit is obtainedmin1，Dmax1) Second constraint (D)min2，Dmax2) And a third constraint (D)min3，Dmax3) And specifically, the method further comprises the following steps:
acquiring a constraint condition of secondary side coil current;
obtaining a third constraint condition (D) of the control parameter D of the secondary side controllable full-bridge rectification circuit according to the mapping relation between the secondary side coil current and the control parameter D of the secondary side controllable full-bridge rectification circuitmin3，Dmax3) Is determined.
It can be understood that after the control mode of the wireless charging system of the electric vehicle and the parameters of the secondary resonant network are determined, the control parameter D of the secondary controllable full-bridge rectifier circuit, the secondary coil current Is, the pre-charging current and the pre-charging current can be represented by the following formula:
Is＝f4(Iout,D)
in order to regulate the present charging current IoutMatched with the required charging current value, there will be no array of one-to-one corresponding secondary side coil current IsAnd the control parameter D of the secondary side controllable full-bridge rectification circuit is satisfied.
Referring to fig. 7, further, the secondary winding current I may be obtainedsThe constraint condition of (2) can be obtained by the constraint condition of the input current of the secondary side controllable full-bridge rectification circuit:
Is_max＝f4(Iout,Dmin3)；
wherein, Is_maxIs the maximum value of the secondary winding current Is, Dmin3A third constraint condition (D) of a control parameter D of the secondary side controllable full-bridge rectification circuitmin3，Dmax3) Is determined.
The embodiment calculates a third constraint condition (D) of a control parameter D of the secondary side controllable full-bridge rectification circuitmin3，Dmax3) Further, the secondary side can be rectified by a controllable full bridgeThe control parameter D of the circuit is restricted, so that the control parameter D of the secondary controllable full-bridge rectification circuit of the wireless charging system of the electric automobile cannot exceed the restriction range, and the safe, stable and reliable operation of the electric automobile is further ensured.
The invention also provides a wireless charging system of the electric automobile, which comprises a memory, a processor, a program of a charging current control method stored on the memory and capable of running on the processor, and a primary side full-bridge inverter circuit, a loose coupling transformer and a secondary side full-bridge rectifier circuit which are electrically connected in sequence, wherein the program of the charging current control method of the wireless charging system is executed by the processor to realize the steps of the charging current control method. The charging current control method includes:
obtaining a first constraint condition (D) of a control parameter D of the secondary side controllable full-bridge rectification circuitmin1，Dmax1) Second constraint (D)min2，Dmax2) And a third constraint (D)min3，Dmax3)；
Acquiring a required charging current and a current charging current of the wireless charging system, and comparing the current charging current with the required charging current;
first constraint condition (D) of control parameter D of secondary side controllable full bridge rectification circuitmin1，Dmax1) Second constraint (D)min2，Dmax2) And a third constraint (D)min3，Dmax3) And adjusting a control parameter D of the secondary side controllable full-bridge rectification circuit according to a comparison result so as to adjust the current charging current, so that the current charging current is consistent with the required charging current.
The specific structure of the charging current control method refers to the above-mentioned embodiments, and the specific structure of the wireless charging system for an electric vehicle refers to the above-mentioned embodiments, and since the wireless charging system for an electric vehicle adopts all the technical solutions of all the above-mentioned embodiments, at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments are achieved, and no further description is given here.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. A charging current control method is used for a wireless charging system of an electric automobile, the wireless charging system of the electric automobile comprises a primary side system, a loose coupling transformer and a secondary side controllable full bridge rectifying circuit, and is characterized in that the charging current control method comprises the following steps:
acquiring a first constraint condition, a second constraint condition and a third constraint condition of a control parameter D of the secondary side controllable full-bridge rectification circuit;
acquiring a required charging current and a current charging current of the wireless charging system, and matching the current charging current with the required charging current;
at present charging current with demand charging current does not match, and at every regulation secondary controllable full-bridge rectifier circuit's control parameter D in-process, when adjusting secondary controllable full-bridge rectifier circuit's control parameter D satisfies first constraint condition, second constraint condition and third constraint condition simultaneously, adjusts one by one secondary controllable full-bridge rectifier circuit's control parameter D, in order to adjust current charging current, until current charging current with demand charging current is unanimous.
2. The charging current control method of claim 1, wherein after the steps of obtaining a required charging current and a present charging current of the wireless charging system and matching the present charging current with the required charging current, the charging current control method further comprises:
when the current charging current is not matched with the required charging current and the control parameter D of the secondary controllable full-bridge rectifying circuit is regulated at any time, and the regulated control parameter D of the secondary controllable full-bridge rectifying circuit does not meet any one of a first constraint condition, a second constraint condition and a third constraint condition, the required current value of the primary coil output to the primary side system is regulated to control the primary side system to regulate the current charging current so that the current charging current is consistent with the required charging current.
3. The charging current control method according to claim 1, wherein the step of obtaining the first constraint condition, the second constraint condition and the third constraint condition of the control parameter D of the secondary-side controllable full-bridge rectification circuit specifically comprises:
acquiring a constraint condition of a primary coil current of the loosely coupled transformer;
and acquiring a first constraint condition of the control parameter D of the secondary controllable full-bridge rectification circuit according to the mapping relation between the current of the primary coil of the loosely coupled transformer and the control parameter D of the secondary controllable full-bridge rectification circuit.
4. The charge current control method of claim 3, wherein said step of obtaining constraints on the current of the primary winding of said loosely coupled transformer comprises:
acquiring the output power, the secondary side efficiency, the primary side compensation inductance value and the primary side self-inductance value of the loosely coupled transformer of the wireless charging system;
according to the obtained output power, the secondary side efficiency, the primary side compensation inductance and the primary side self-inductance value of the loosely coupled transformer of the wireless charging system, calculating the constraint condition of the primary side coil current of the loosely coupled transformer under the constraint condition that the primary side inverter current of the wireless charging system takes the maximum value through the following formula:
Figure FDA0002855952380000021
wherein f is the wireless chargerOperating frequency, P, of the electrical systemoutOutput power for the wireless charging system, Lp_maxIs the maximum value of the primary side self-inductance, L, of the loosely coupled transformerp_minIs the primary side self-inductance minimum, L, of the loosely coupled transformer1Compensating inductance of the primary side of the wireless charging system, wherein eta is vehicle-mounted side efficiency of the wireless charging system, iinIs the primary side inverter current of the wireless charging system, IpThe primary coil current of the loosely coupled transformer is represented by beta, and the secondary impedance angle of the wireless charging system is represented by beta.
5. The charging current control method according to claim 1, wherein the step of obtaining the first constraint condition, the second constraint condition and the third constraint condition of the control parameter D of the secondary-side controllable full-bridge rectification circuit specifically comprises:
acquiring a constraint condition of a secondary side impedance angle of the secondary side controllable full-bridge rectification circuit;
according to the mapping relation between the secondary side impedance angle of the secondary side controllable full-bridge rectification circuit and the control parameter D; and acquiring a second constraint condition of a control parameter D of the secondary side controllable full-bridge rectification circuit.
6. The charge current control method according to claim 5, wherein the step of obtaining the constraint condition of the secondary side impedance angle of the secondary side controllable full-bridge rectification circuit comprises:
acquiring the output power, the secondary side efficiency, the primary side compensation inductance value and the primary side self-inductance value of the loosely coupled transformer of the wireless charging system;
calculating the constraint condition of the secondary impedance angle of the secondary controllable full-bridge rectification circuit under the constraint condition that the primary inverter current of the wireless charging system takes the maximum value according to the acquired output power, the secondary efficiency, the primary compensation inductance and the primary self-inductance value of the loosely coupled transformer of the wireless charging system; specifically, the calculation is performed by the following formula:
Figure FDA0002855952380000031
wherein f is the operating frequency of the wireless charging system, PoutOutput power for the wireless charging system, Lp_maxIs the maximum value of the primary side self-inductance, L, of the loosely coupled transformerp_minIs the primary side self-inductance minimum, L, of the loosely coupled transformer1Compensating inductance of the primary side of the wireless charging system, wherein eta is vehicle-mounted side efficiency of the wireless charging system, iinIs the primary side inverter current of the wireless charging system, IpThe primary coil current of the loosely coupled transformer is represented by beta, and the secondary impedance angle of the wireless charging system is represented by beta.
7. The charging current control method according to claim 1, wherein the obtaining of the first constraint condition, the second constraint condition and the third constraint condition of the control parameter D of the secondary-side controllable full-bridge rectification circuit specifically comprises:
acquiring a constraint condition of the input current of the secondary side controllable full-bridge rectification circuit;
and acquiring the maximum constraint value of the third constraint condition of the control parameter D of the secondary side controllable full-bridge rectification circuit according to the mapping relation between the input current of the secondary side controllable full-bridge rectification circuit and the control parameter D.
8. The charging current control method according to claim 7, wherein the obtaining of the first constraint condition, the second constraint condition, and the third constraint condition of the control parameter D of the secondary-side controllable full-bridge rectifier circuit specifically includes:
acquiring a constraint condition of secondary side coil current;
and acquiring the minimum constraint value of the third constraint condition of the control parameter D of the secondary controllable full-bridge rectification circuit according to the mapping relation between the secondary coil current and the control parameter D of the secondary controllable full-bridge rectification circuit.
9. The charge current control method according to claim 1, further comprising:
and determining the equivalent impedance of the secondary controllable full-bridge rectification circuit to determine the working mode of the secondary controllable full-bridge rectification circuit.
10. A wireless charging system for an electric vehicle, comprising a memory, a processor, a program of a charging current control method stored in the memory and operable on the processor, and a primary full-bridge inverter circuit, a loosely coupled transformer, and a secondary full-bridge rectifier circuit electrically connected in sequence, wherein the program of the charging current control method for the wireless charging system, when executed by the processor, implements the steps of the charging current control method according to any one of claims 1 to 9.
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