CN112737141A - Constraint method and device for primary and secondary control quantity and wireless charging system - Google Patents

Constraint method and device for primary and secondary control quantity and wireless charging system Download PDF

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Publication number
CN112737141A
CN112737141A CN202011545023.2A CN202011545023A CN112737141A CN 112737141 A CN112737141 A CN 112737141A CN 202011545023 A CN202011545023 A CN 202011545023A CN 112737141 A CN112737141 A CN 112737141A
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primary
wireless charging
charging system
inductance
primary side
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CN112737141B (en
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刘玮
胡超
罗勇
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Zhongxing New Energy Technology Co ltd
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Zhongxing New Energy Technology Co ltd
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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
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • 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
    • 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
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

Abstract

The invention discloses a method and a device for constraining original secondary control quantity and a wireless charging system, wherein the method for constraining the original secondary control quantity comprises the following steps: acquiring a primary side self-inductance value of the loosely coupled transformer, and a primary side compensation inductance value, output power and secondary side efficiency of the wireless charging system; determining a constraint target of the wireless charging system; and calculating the constraint condition of the primary and secondary control quantity of the wireless charging system according to a preset formula so as to control the operation of the wireless charging system. The technical scheme of the invention improves the reliability of the wireless charging system.

Description

Constraint method and device for primary and secondary control quantity and wireless charging system
Technical Field
The invention relates to the technical field of wireless charging of electric automobiles, in particular to a method and a device for restraining primary and secondary control quantities and a wireless charging system.
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 loosely coupled transformer 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 for charging voltage is dynamically changed, so that the wireless charging system needs to adjust the output voltage of the output system according to the requirement for the automobile charging voltage value.
In order to solve the application problem, multi-stage control is usually adopted on the primary side and the secondary side, in order to better realize safe and stable operation of the system, information delivery of primary coil current Ip is carried out by ground equipment and vehicle-mounted equipment, the vehicle-mounted equipment issues a primary coil current required value Ip _ ref to the ground equipment through wireless communication, the ground equipment adjusts according to the required value Ip _ ref, the primary coil current Ip is equal to the required value Ip _ ref, and the actual primary coil current Ip is sent to the vehicle-mounted equipment through wireless communication. The working state of the vehicle-mounted equipment can affect the ground equipment, and further affect the function, performance and safety and reliability of the wireless charging system. For example: when the secondary impedance angle β is too large (or the secondary power factor is too small), the output current of the ground equipment inverter circuit may be too large, which affects the system performance, and in severe cases, the system may not work or even be damaged.
In the related art, the control quantity of the secondary side is constrained, for example, the control quantity of the secondary side controllable rectification circuit phase shift angle and/or duty ratio, and/or tuning mode (phase relation between Ve and Ie: capacitive mode/resistive mode/inductive mode) is constrained, and the constraint condition is usually calibrated through 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 increase the system cost and reduce the system performance.
Disclosure of Invention
The invention mainly aims to provide a method and a device for restraining primary and secondary control quantities and a wireless charging system, and aims to improve the reliability of the wireless charging system.
In order to achieve the above object, the present invention provides a method for constraining primary and secondary control quantities, which is used for a wireless charging system, and the method for constraining primary and secondary control quantities includes:
acquiring a primary side self-inductance value of the loosely coupled transformer, and a primary side compensation inductance value, output power and secondary side efficiency of the wireless charging system;
determining a constraint objective for the wireless charging system;
and calculating a constraint condition of primary and secondary control quantity of the wireless charging system according to a preset formula so as to control the operation of the wireless charging system.
Optionally, the primary side self-inductance value of the loosely coupled transformer includes a primary side self-inductance maximum value, a primary side self-inductance minimum value, and a primary side self-inductance actual value.
Optionally, the constraint target of the wireless charging system is any one or two of a working range of the primary-side inverter current, a working range of the primary-side coil current and a working range of the secondary-side impedance angle.
Optionally, the constraint condition of the primary and secondary control quantities of the wireless charging system is a working range of a primary coil current and/or a working range of a secondary impedance angle.
Optionally, determining a working range of a current of the primary side coil and/or a working range of a secondary side impedance angle according to the working range of the primary side inverter current; or
And determining the working range of the current of the primary coil and/or the working range of the impedance angle of the secondary side according to the working range of the primary side inverter current and the actual value of the primary side self-inductance.
Optionally, the preset formula is:
Figure BDA0002854489800000021
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 threshold value, I, of the wireless charging systempThe 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 preset formula is:
Figure BDA0002854489800000022
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 transformerpIs the actual value of the primary side self-inductance, 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 threshold value, I, of the wireless charging systempThe 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, an error range of the vehicle-mounted efficiency of the wireless charging system is less than 8%.
The invention also provides a restraint device of the original secondary control quantity, which is used for a wireless charging system, and comprises a primary side full-bridge inverter circuit, a loose coupling transformer, an original secondary compensation circuit and a secondary side full-bridge rectifier circuit which are electrically connected in sequence, a memory, a processor and a secondary control quantity restraint control program which is stored on the memory and can be operated on the processor, wherein the step of the restraint method of the original secondary control quantity is realized when the restraint control program of the secondary control quantity is executed by the processor;
the constraint method of the primary and secondary side control quantity comprises the following steps:
acquiring a primary side self-inductance value of the loosely coupled transformer, and a primary side compensation inductance value, output power and secondary side efficiency of the wireless charging system;
determining a constraint objective for the wireless charging system;
and calculating a constraint condition of primary and secondary control quantity of the wireless charging system according to a preset formula so as to control the operation of the wireless charging system.
The invention also provides a wireless charging system which comprises the restraint device for the primary and secondary control quantity.
The method for restraining the primary and secondary control quantity in the technical scheme is used for a wireless charging system, wherein the wireless charging system is provided with a loose coupling transformer and is used for acquiring the primary self-inductance value of the loose coupling transformer and known quantities such as the primary compensation inductance quantity, the output power, the secondary efficiency and the like of the wireless charging system; determining a constraint target of the wireless charging system; finally, according to the self-inductance value of the primary side, the compensation inductance value of the primary side of the wireless charging system, the output power and the secondary side efficiency, and the constraint target of the wireless charging system, namely the working range of the primary side inverter current, the working range of the primary side coil current and/or the working range of the secondary side impedance angle; substituting the constraint condition into a preset formula to calculate the primary and secondary control quantity of the wireless charging system so as to control the operation of the wireless charging system, namely determining the working range of the current of the primary coil and/or the working range of the secondary impedance angle so as to control the stable operation of the wireless charging system. The wireless charging system operates in a safe range, impact on ground equipment is avoided, and reliability of the wireless charging system is 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 an embodiment of a method for constraining primary and secondary side control quantities according to the present invention;
fig. 2 is a schematic circuit diagram of a wireless charging system according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a wireless charging system according to another embodiment of the present invention;
FIG. 4 is a schematic diagram of a constraint condition curve according to an embodiment of the constraint method for primary and secondary side control quantities of the present invention;
FIG. 5 is a schematic diagram of a constraint condition curve according to another embodiment of the constraint method for primary and secondary side control quantities of 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.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is 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, if appearing throughout the text, "and/or" is meant to include three juxtaposed aspects, taking "A and/or B" as an example, including either the A aspect, or the B aspect, or both A and B satisfied aspects. 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 invention provides a constraint method of primary and secondary control quantity, which is used for a wireless charging system, wherein the wireless charging system is provided with a loose coupling transformer.
In a first embodiment of the present invention, referring to fig. 1, the method for constraining the primary and secondary side control quantities includes:
step S10, acquiring a primary side self-inductance value of the loosely coupled transformer, and a primary side compensation inductance value, output power and secondary side efficiency of the wireless charging system;
step S20, determining a constraint target of the wireless charging system;
and step S30, calculating the constraint condition of the primary and secondary control quantity of the wireless charging system according to a preset formula so as to control the operation of the wireless charging system.
The circuit configuration of the wireless charging system in the primary-secondary control method of the wireless charging system is shown in fig. 2, in which the primary side is the primary side of the wireless charging system, the vehicle-mounted side is the secondary side of the wireless charging system, and LpBeing the primary winding of a loosely coupled transformer, LsBeing secondary windings of loosely coupled transformers, IpPrimary side current of loosely coupled transformer, IsThe current of the secondary side of the loosely coupled transformer is respectively a transmitting device and a receiving device of energy, and M is the mutual inductance value of the primary side coil and the secondary side coil of the loosely coupled transformer. The switching tube Qp1, the switching tube Qp2, the switching tube Qp3 and the switching tube Qp4 jointly form a primary side full bridge inverter circuit of the loosely coupled transformer, and are responsible for converting an accessed direct-current power supply into a high-frequency power supply; the switch tube Qs1, the switch tube Qs2, the switch tube Qs3 and the switch tube Qs4 jointly form a secondary full-bridge rectification circuit of the loosely coupled transformer, and are responsible for rectifying a high-frequency power supply converted by the primary full-bridge inversion circuit and simultaneously rectifying the output current I of the wireless charging systemoutIs regulated with an input current of IeAt a midpoint voltage of VeEquivalent resistance Re＝Ve/Ie. The secondary side can be shifted in phase, and/or duty cycle ratio VeAnd IoutCan adjust and simultaneously can also adjust VeAnd IeThe phase is adjusted.
Of course, this patent is not limited to the secondary side full bridge circuit, and any bridge circuit having at least 2 switching devices, such as those obtained by replacing Qs1 and Qs2 in fig. 2 with diodes, or replacing Qs3 and Qs4 with diodes, or replacing Qs1 and Qs3 with diodes, or replacing Qs2 and Qs4 with diodes, can be regarded as equivalent circuits of the full bridge circuit in this patent, and the primary and secondary side control method of the wireless charging system in this scheme can be adopted as well.
In this embodiment, the circuit model of the wireless charging system and the secondary impedance Z of the wireless charging systemsAnd primary side impedance ZinReferring to fig. 3, the secondary impedance Z of the wireless charging systemsIt can be calculated according to the following secondary impedance formula:
Figure BDA0002854489800000051
assuming that the secondary impedance angle of the wireless charging system is β, the secondary impedance angle is defined as follows:
β＝arg(Zs)
primary impedance Z of loosely coupled transformerinIt can be calculated from the following primary impedance equation:
Figure BDA0002854489800000061
when the output power V of the wireless charging systemout/IoutWhen changed or adjusted on the vehicle side, the equivalent resistance ReThe corresponding secondary impedance Z can be seen according to the secondary impedance formula and the primary impedance formulasSecondary impedance angle beta, primary impedance ZinChanges will occur. When the secondary impedance angle beta varies greatly, the primary impedance Z may be causedinIs too large or in a hard switching state, resulting in a large primary side inverter current IinFurther, the efficiency performance of the wireless charging system is affected, and the wireless charging system is damaged in severe cases.
The method for restraining the primary and secondary control quantity in the technical scheme is used for a wireless charging system, wherein the wireless charging system is provided with a loose coupling transformer and is used for acquiring the primary self-inductance value of the loose coupling transformer and known quantities such as the primary compensation inductance quantity, the output power, the secondary efficiency and the like of the wireless charging system; determining a constraint target of the wireless charging system; finally, according to the self-inductance value of the primary side, the compensation inductance value of the primary side of the wireless charging system, the output power and the secondary side efficiency, and the constraint target of the wireless charging system, namely the working range of the primary side inverter current, the working range of the primary side coil current and/or the working range of the secondary side impedance angle; substituting the constraint condition into a preset formula to calculate the primary and secondary control quantity of the wireless charging system so as to control the operation of the wireless charging system, namely determining the working range of the current of the primary coil and/or the working range of the secondary impedance angle so as to control the stable operation of the wireless charging system. The wireless charging system operates in a safe range, impact on ground equipment is avoided, and reliability of the wireless charging system is improved.
In one embodiment, the primary side self-inductance value of the loosely coupled transformer includes a primary side self-inductance maximum value, a primary side self-inductance minimum value and a primary side self-inductance actual value.
The constraint target of the wireless charging system is any one or two of the working range of the primary side inverter current, the working range of the primary side coil current and the working range of the secondary side impedance angle.
The constraint condition of the primary and secondary control quantity of the wireless charging system is the working range of the current of the primary coil and/or the working range of the secondary impedance angle.
It can be understood that the constraint target of the wireless charging system can be the working range of the primary side inverter current, the working range of the primary side coil current or the working range of the secondary side impedance angle; the operating range of the primary side inverter current and the operating range of the primary side coil current can be set, the operating range of the primary side inverter current and the operating range of the secondary side impedance angle can be set, or the operating range of the primary side coil current and the operating range of the secondary side impedance angle can be set.
Further, when the constraint target of the wireless charging system is the working range of the primary side inverter current, the constraint conditions of the working range of the primary side coil current and the working range of the secondary side impedance angle are determined; when the constraint target of the wireless charging system is the working range of the current of the primary coil, determining the constraint conditions of the working range of the primary inverter current and the working range of the secondary impedance angle; when the constraint target of the wireless charging system is the working range of the secondary impedance angle, determining the constraint conditions of the working range of the primary coil current and the working range of the primary inverter current; when the constraint target of the wireless charging system is the working range of the primary side inverter current and the working range of the primary side coil current, determining the constraint condition of the working range of the secondary side impedance angle; when the constraint target of the wireless charging system is the working range of the primary side inverter current and the working range of the secondary side impedance angle, determining the constraint condition of the working range of the primary side coil current; when the constraint target of the wireless charging system is the working range of the current of the primary coil and the working range of the impedance angle of the secondary coil, the constraint condition of the working range of the primary inverter current is determined. Can make wireless charging system operate in safe range, avoid causing the impact to ground equipment, promote wireless charging system's reliability.
Based on the embodiment, the scheme simplifies the constraint conditions, unifies the constraint conditions of different control quantities of the secondary side of the wireless charging system into the constraint conditions of the impedance angle of the secondary side; determining a constraint condition of a secondary impedance angle according to the working range of the primary inverter current and the working range of the primary coil current; or according to the working range of the primary side inverter current, the constraint conditions of different primary side coil currents and secondary side impedance angles are further determined, so that the wireless charging system operates in a safe range, impact on ground equipment is avoided, and the reliability of the wireless charging system is improved.
In one embodiment, the working range of the current of the primary side coil and/or the working range of the impedance angle of the secondary side are/is determined according to the working range of the primary side inverter current; or
And determining the working range of the current of the primary coil and/or the working range of the impedance angle of the secondary side according to the working range of the primary side inverter current and the actual value of the primary side self-inductance.
In this embodiment, the preset formula is (here, the preset formula is represented by a preset formula 1):
Figure BDA0002854489800000071
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 threshold value, I, of the wireless charging systempThe 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.
It should be noted that the operating frequency f of the wireless charging system is a system operating frequency, which is usually a fixed frequency and a fixed value; output power P of wireless charging systemoutThe system output power is determined by a use scene, can be determined when a wireless charging system is designed, and is a fixed value; primary side self-inductance maximum value L of loose coupling transformerp_maxPrimary side self-inductance minimum L of and loose coupling transformerp_minThe value of the self-inductance is related to the primary side and secondary side structures (including windings, sizes, magnetic cores, aluminum plates and the like) of the loose coupling transformer, the primary side and secondary side air gaps and offset changes of the loose coupling transformer, and the self-inductance value of the primary side can be determined after the loose coupling transformer and the use scene of the loose coupling transformer are determined; primary side compensation inductance L of wireless charging system1Setting a design value; the vehicle-mounted side efficiency eta of the wireless charging system can be determined according to the minimum efficiency value.
Further, the variable on the right side of the preset formula 1 in this embodiment is the primary coil current IpAnd the secondary impedance angle β, which are the primary and secondary control variables, respectively, so that the predetermined formula 1 can be simplified as follows:
iin＝f(Ipβ); i.e. according to the primary side inversion current IinTo determine the primary coil current IpAnd/or the secondary side impedance angle beta.
When determining the primary side inverter current threshold iin(or working range), namely the primary side inverter current threshold i can be determined by a preset formula 1inPrimary winding current IpAnd secondary impedance angle beta.
E.g. when f is 85.5kHz, Lp_max-Lp_min＝7.1μH，Pout＝10kW,L122 muH, different primary side inverter current threshold iinPrimary winding current IpAnd the constraint condition of the secondary impedance angle beta is shown in figure 4 according to the primary side inversion current IinThe maximum value of the constraint condition is determined as a constraint target as shown in the following table 1:
serial number Constraint target Constraint conditions
1 Primary side inverter current Iin≦45A Primary coil current Ip34.5A, and a secondary side impedance angle beta ≦ 45 °
2 Primary side inverter current Iin≦40A Primary coil current Ip34.5A, and a secondary side impedance angle beta ≦ 35 °
The constraint condition in table 1 is a maximum value of the entire wireless charging system, that is, within the constraint condition value, the wireless charging system can satisfy the constraint target. Under the constraint condition, some working conditions may cause system cost increase or system performance reduction, and in order to solve the problem, the setting of the constraint condition is further refined, for example, the primary side inversion current I is usedin≦ 45A is an example of a constraint target, whose refinement of the constraint is shown in Table 2 below:
Figure BDA0002854489800000081
in another embodiment, the preset formula is (where the preset formula is represented by preset formula 2 below):
Figure BDA0002854489800000091
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 transformerpIs the actual value of the primary side self-inductance, L, of the loosely coupled transformer1Compensating the inductance of the primary side of the wireless charging system, wherein eta is the efficiency of the vehicle-mounted side of the wireless charging system, iinIs the primary side inverter current threshold value, I, of the wireless charging systempThe 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.
Further, the variable on the right side of the preset formula 2 in this embodiment is the primary coil current IpBesides the secondary impedance angle beta, a primary self-inductance actual value L is addedpTherefore, the predetermined formula 2 can be expressed simply as follows:
iin＝f(Lp,Ipβ); i.e. according to the primary side inversion current IinWorking range and actual primary self-inductance value LpTo determine the primary coil current IpWorking range and/or secondary side impedance ofThe working range of angle beta.
At different primary side inversion current threshold iinPrimary winding current IpAnd secondary side impedance angle beta is shown in FIG. 5, where Δ Lp＝Lp max-LpFrom fig. 5, table 3 can be derived as follows:
Figure BDA0002854489800000092
in one embodiment, the error range of the vehicle-mounted side efficiency η of the wireless charging system is less than 8%. It can be understood that the vehicle-mounted efficiency η of the wireless charging system is an estimated value, and the value is within an error range of 8%; namely, the highest efficiency eta of the vehicle-mounted side cannot reach 100 percent and the lowest efficiency eta of the vehicle-mounted side cannot be lower than 90 percent, and the degree of the secondary impedance angle beta of the wireless charging system is in the range of 1-2 degrees.
The invention also provides a restraint device of the original secondary control quantity, which is used for a wireless charging system, and comprises a primary full-bridge inverter circuit, a loose coupling transformer, a secondary full-bridge rectifier circuit, a memory, a processor and a secondary control quantity restraint control program, wherein the primary full-bridge inverter circuit, the loose coupling transformer and the secondary full-bridge rectifier circuit are sequentially and electrically connected, the secondary control quantity restraint control program is stored on the memory and can be operated on the processor, and the secondary control quantity restraint control program is executed by the processor to realize the steps of the restraint method of the original secondary control quantity;
the constraint method of the primary and secondary side control quantity comprises the following steps:
acquiring a primary side self-inductance value of the loosely coupled transformer, and a primary side compensation inductance value, output power and secondary side efficiency of the wireless charging system;
determining a constraint objective for the wireless charging system;
and calculating a constraint condition of primary and secondary control quantity of the wireless charging system according to a preset formula so as to control the operation of the wireless charging system.
The specific structure of the original secondary control quantity constraint method refers to the above-described embodiment, and the specific structure of the wireless charging system refers to the above-described embodiment.
The invention also provides a wireless charging system which is characterized by comprising the restraint device for the primary and secondary control quantity.
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 made by the contents of the specification and drawings or directly/indirectly applied to other related technical fields are included in the scope of the present invention.

Claims (10)

1. A method for constraining primary and secondary control quantity is used for a wireless charging system, the wireless charging system is provided with a loose coupling transformer, and the method for constraining the primary and secondary control quantity comprises the following steps:
acquiring a primary side self-inductance value of the loosely coupled transformer, and a primary side compensation inductance value, output power and secondary side efficiency of the wireless charging system;
determining a constraint objective for the wireless charging system;
and calculating a constraint condition of primary and secondary control quantity of the wireless charging system according to a preset formula so as to control the operation of the wireless charging system.
2. The method for constraining primary and secondary side control quantities according to claim 1, wherein the primary side self-inductance values of the loosely coupled transformer include a primary side self-inductance maximum value, a primary side self-inductance minimum value, and a primary side self-inductance actual value.
3. The primary and secondary control quantity constraint method according to claim 2, wherein the constraint target of the wireless charging system is any one or two of the working range of the primary inverter current, the working range of the primary coil current and the working range of the secondary impedance angle.
4. The method for constraining the primary and secondary control quantities according to claim 3, wherein the constraint condition of the primary and secondary control quantities of the wireless charging system is an operating range of a primary coil current and/or an operating range of a secondary impedance angle.
5. The primary-secondary control quantity constraint method according to claim 4, characterized in that the working range of the primary coil current and/or the working range of the secondary impedance angle are determined according to the working range of the primary inverse current; or
And determining the working range of the current of the primary coil and/or the working range of the impedance angle of the secondary side according to the working range of the primary side inverter current and the actual value of the primary side self-inductance.
6. The method for constraining primary and secondary side control quantities according to claim 5, wherein the preset formula is:
Figure FDA0002854489790000011
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 threshold value, I, of the wireless charging systempThe 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 method for constraining primary and secondary side control quantities according to claim 5, wherein the preset formula is:
Figure FDA0002854489790000021
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 transformerpIs the actual value of the primary side self-inductance, 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 threshold value, I, of the wireless charging systempThe 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.
8. The method for restraining primary and secondary control quantities according to any one of claims 1 to 7, wherein an error range of the vehicle-mounted side efficiency of the wireless charging system is less than 8%.
9. A restraint device of primary and secondary control quantity is used for a wireless charging system and is characterized in that the restraint device of the primary and secondary control quantity comprises a primary side full-bridge inverter circuit, a loose coupling transformer, a primary and secondary side compensation circuit and a secondary side full-bridge rectifier circuit which are electrically connected in sequence, a memory, a processor and a secondary side control quantity restraint control program which is stored on the memory and can run on the processor, and when the processor executes the secondary side control quantity restraint control program, the steps of the restraint method of the primary and secondary control quantity as claimed in any one of claims 1 to 8 are realized.
10. A wireless charging system, characterized in that it comprises a primary and secondary control quantity restriction device according to claim 9.
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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150015197A1 (en) * 2013-07-11 2015-01-15 The Regents Of The University Of Michigan Double-sided lcc compensation method for wireless power transfer
CN106560974A (en) * 2016-10-28 2017-04-12 中兴新能源汽车有限责任公司 Wireless charging system and automobile wireless charging device
US20170240056A1 (en) * 2016-02-19 2017-08-24 Ford Global Technologies, Llc Ss-l wireless power transfer compensation circuit
WO2017167225A1 (en) * 2016-04-01 2017-10-05 杨军 Movable three-dimensional wireless charging device for multiple phones
CN110450656A (en) * 2019-07-08 2019-11-15 浙江大学 A kind of electric car wireless charging closed-loop control system based on differential inductance
CN110504726A (en) * 2019-08-23 2019-11-26 哈尔滨工业大学（威海） The structure parameter optimizing method and device of wireless charging magnetic coupling device
CN110936827A (en) * 2019-12-20 2020-03-31 中兴新能源汽车有限责任公司 Wireless charging system, wireless charging control method and automobile wireless charging device
CN110949152A (en) * 2019-12-20 2020-04-03 中兴新能源汽车有限责任公司 Wireless charging system and method and automobile wireless charging device

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150015197A1 (en) * 2013-07-11 2015-01-15 The Regents Of The University Of Michigan Double-sided lcc compensation method for wireless power transfer
US20170240056A1 (en) * 2016-02-19 2017-08-24 Ford Global Technologies, Llc Ss-l wireless power transfer compensation circuit
WO2017167225A1 (en) * 2016-04-01 2017-10-05 杨军 Movable three-dimensional wireless charging device for multiple phones
CN106560974A (en) * 2016-10-28 2017-04-12 中兴新能源汽车有限责任公司 Wireless charging system and automobile wireless charging device
CN110450656A (en) * 2019-07-08 2019-11-15 浙江大学 A kind of electric car wireless charging closed-loop control system based on differential inductance
CN110504726A (en) * 2019-08-23 2019-11-26 哈尔滨工业大学（威海） The structure parameter optimizing method and device of wireless charging magnetic coupling device
CN110936827A (en) * 2019-12-20 2020-03-31 中兴新能源汽车有限责任公司 Wireless charging system, wireless charging control method and automobile wireless charging device
CN110949152A (en) * 2019-12-20 2020-04-03 中兴新能源汽车有限责任公司 Wireless charging system and method and automobile wireless charging device

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