CN111463876A

CN111463876A - Wireless charging control method, system and storage medium thereof

Info

Publication number: CN111463876A
Application number: CN202010411286.8A
Authority: CN
Inventors: 胡超; 刘玮; 罗勇
Original assignee: Zhongxing New Energy Automobile Co ltd
Current assignee: Zhongxing New Energy Automobile Co ltd
Priority date: 2020-05-15
Filing date: 2020-05-15
Publication date: 2020-07-28

Abstract

The invention discloses a wireless charging control method and a wireless charging and storage medium, wherein the wireless charging control method is applied to a wireless charging control system, the wireless charging control system comprises a infrastructure side and a vehicle side, the infrastructure side is provided with an internal control circuit and a primary side coil, the internal control circuit comprises a PFC circuit, a BUCK circuit and an inverter circuit, the vehicle side is provided with a secondary side coil and a full-bridge rectification circuit, and the wireless charging control method comprises the following steps: obtaining an initial target current demand value I required to be reached by a primary coil_p‑req(ii) a According to the obtained initialInitial target current demand value I_p‑reqAdjusting the actual value of the output current I of the primary coil_p‑fac(ii) a Judging the actual current value I of the primary coil_p‑facCorresponding actual value I of system output current_out‑facWhether the vehicle-mounted side current demand value is reached or not; controlling the system to output an actual current value I according to the judgment result_out‑fac. The technical scheme of the invention aims to ensure that the wireless charging system meets the charging requirement.

Description

Wireless charging control method, system and storage medium thereof

Technical Field

The invention relates to the technical field of wireless charging, in particular to a wireless charging control method, a wireless charging control system and a storage medium.

Background

Along with the development of new forms of energy, more and more cars begin to adopt electronic, or oil-electricity mixes, and when charging for electric automobile, can utilize the principle of electromagnetic induction, the wireless mode of charging of sampling charges. Wireless charging is a new charging technology that has emerged in recent years, and charging within a certain space range can be realized without the help of a charging wire. The implementation method is mainly based on Wireless Power Transfer) technology, electric energy is transmitted from a primary side input voltage end to an electric equipment end in a non-contact mode by using principles of magnetic resonance coupling, laser, microwave and the like, Wireless charging/Power supply of the electric equipment can be achieved, and the Wireless Power transmission method has the advantages of safety, reliability, flexibility, convenience, environmental friendliness, all-weather working and the like, and therefore the Wireless Power transmission method is widely concerned in recent years.

The wireless charging of the electric automobile needs to solve the problems of charging compatibility and interoperability of different types of vehicles, different equipment manufacturers and different power levels, namely, the problem of realizing high performance of a wireless charging system under the application conditions of uncertain system parameters, uncertain output voltage, uncertain load, uncertain offset of primary and secondary side equipment, uncertain external disturbance and the like needs to be solved, wherein the high performance comprises two aspects of high efficiency and full power. The full power output is one of the core targets of the charging control of the electric automobile, and is an index for ensuring that the electric automobile can finish charging according to the preset time. Due to the inevitable existence of various uncertain factors, the wireless charging system cannot meet the charging requirement under certain conditions.

The foregoing is merely provided to aid in understanding the teachings of the present application and is not intended to represent the prior art to which the foregoing pertains.

Disclosure of Invention

The embodiment of the invention provides a wireless charging control method, a wireless charging control system and a storage medium, and aims to ensure that a wireless charging system meets charging requirements.

In order to achieve the above object, the present invention provides a wireless charging control method, which is applied to a wireless charging control system, the wireless charging control system includes a infrastructure side and a vehicle side, the infrastructure side is provided with an internal control circuit and a primary side coil, the internal control circuit includes a PFC circuit, a BUCK circuit and an inverter circuit, the vehicle side is provided with a secondary side coil and a full-bridge rectifier circuit, and the wireless charging control method includes the following steps:

obtaining an initial target current demand value I required to be reached by a primary coil_p-req；

According to the acquired initial target current demand value I_p-reqAdjusting the actual value of the output current I of the primary coil_p-fac；

Judging the actual current value I of the primary coil_p-facCorresponding actual value I of system output current_out-facWhether the vehicle-mounted side current demand value is reached or not;

controlling the system to output an actual current value I according to the judgment result_out-fac。

In some embodiments of the present invention, the system is controlled to output the actual current value I according to the determination result_out-facComprises the following steps:

if yes, the state of the primary side is kept, and the actual current value I of the primary side coil is kept_p-facSupplying power;

if not, keeping the duty ratio of the full-bridge rectification circuit, and adjusting the target current demand value I_p-reqAccording to the adjusted target current demand value I_p-reqChanging the actual value of the current I of the primary coil_p-facSo that the actual value of the current I is changed_p-facCorresponding actual value I of the system output current_out-facThe vehicle-mounted side current demand value is reached.

In some embodiments of the invention, the target current demand value I is obtained according to the current demand value_p-reqAdjusting the actual value of the output current I of the primary coil_p-facComprises the following steps:

judging the actual current value I reached by the primary coil_p-facWhether the target current demand value I is reached_p-req；

If yes, the state of the capital construction side is maintained, and the actual current value I is maintained_p-facSupplying power;

if not, according to the acquired target current demand value I_p-reqAdjusting actual value of output current I of primary coil_p-facTo achieve the target current demand value I_p-req。

the voltage of the internal control circuit and/or the phase shift angle of the inverter are adjusted.

In some embodiments of the present invention, the step of adjusting the voltage of the internal control circuit and/or the phase shift angle of the inverter further comprises:

detecting the adjusted voltage of the internal control circuit and/or the current actual value I of the current primary coil corresponding to the phase shift angle of the inverter_p-fac；

Judging the current actual value I of the current primary coil_p-facCorresponding actual value I of system output current_out-facIs equal to the system output current demand value I_out-req；

If yes, the state of the infrastructure side is kept, and the current actual value I of the current primary side coil is kept_p-facSupplying power;

the internal control circuit comprises a BUCK circuit and a PFC circuit, and the step of adjusting the voltage of the internal control circuit comprises the following steps:

adjusting the duty ratio of the BUCK circuit; and/or

And adjusting the duty ratio of the PFC circuit.

In some embodiments of the present invention, the determining the current actual value I of the current primary coil_p-facCorresponding actual value I of system output current_out-facIs equal to the system output current demand value I_out-reqFurther comprising after the step of:

if not, judging whether the voltage of the current internal control circuit and the phase-shifting angle of the current inverter reach the threshold values and/or the current demand value I of the current primary coil_p-reqWhether a threshold value is reached;

if not, continuing to execute the target current demand value I according to the acquired target current demand value I_p-reqAdjusting actual value of output current I of primary coil_p-facUntil the current actual value I of the current primary coil_p-facCorresponding actual value I of system output current_out-facIs equal to the system output current demand value I_out-req；

If yes, the state of the capital construction side is kept, and the current actual current value I is kept_p-facSupplying power, and adjusting the duty ratio of the full-bridge rectifying circuit according to the adjusting request;

detecting the actual value I of the system output current corresponding to the adjusted full-bridge rectification circuit duty ratio_out-facAnd judging whether the current is equal to the current system output current demand value I_out-req；

If yes, the state of the capital construction side is kept, and the current actual current value I is kept_p-facAnd supplying power and keeping the duty ratio of the current full-bridge rectification circuit.

In some embodiments of the present invention, the detecting the actual value I of the system output current corresponding to the adjusted duty cycle of the full-bridge rectification circuit_out-facAnd judging whether the current is equal to the current system output current demand value I_out-reqFurther comprising after the step of:

if not, the duty ratio of the full-bridge rectification circuit is adjusted again, and whether the duty ratio of the full-bridge rectification circuit after the secondary adjustment reaches the minimum duty ratio value is judged;

if yes, stopping charging or low-power output charging;

if not, detecting the actual value I of the system output current corresponding to the duty ratio of the full-bridge rectification circuit after readjustment_out-facAnd judging whether the current is equal to the system output current demand value I_out-req；

If so, keeping the state of the infrastructure side and keeping the current full-bridge rectification circuit to supply power by the duty ratio;

if not, all the steps of adjusting the duty ratio of the full-bridge rectification circuit again and judging whether the duty ratio of the full-bridge rectification circuit after secondary adjustment reaches the minimum value of the duty ratio are carried out until the actual value I of the output current of the system_out-facEqual to system output current demand value I_out-req。

In some embodiments of the present invention, the system is controlled to output the actual current value I according to the determination result_out-facFurther comprising the steps of:

if not, keeping the target current demand value I_p-reqAdjusting the duty ratio of the full-bridge rectification circuit;

If so, keeping the duty ratio of the full-bridge rectification circuit to supply power;

if not, continuously adjusting the duty ratio of the full-bridge rectification circuit until the actual value I of the system output current_out-facEqual to the current system output current demand value I_out-req；

Or, the system is controlled to output the actual current value I according to the judgment result_out-facFurther comprising the steps of:

if not, adjusting the duty ratio of the full-bridge rectification circuit and simultaneously adjusting the target current demand value I required by the primary coil_p-req；

Detecting the current system output current actual value I_out-facAnd judging whether the current is equal to the current system output current demand value I_out-req；

If so, keeping the duty ratio of the full-bridge rectification circuit and the state of the infrastructure side for power supply;

if not, continuously adjusting the duty ratio of the full-bridge rectification circuit and adjusting the target current demand value I required by the primary coil_p-reqUntil the actual value of the system output current I_out-facEqual to the current system outputOutput current demand value I_out-req。

In some embodiments of the invention, the obtaining of the target current demand value I required to be achieved by the primary winding is performed_p-reqBefore the step (2) further comprising:

initializing a system state according to a charging request sent by a vehicle controller;

determining the initial value of the duty ratio of the full-bridge rectification circuit and the initial target current demand value I of the primary coil according to the system state_p-req；

The vehicle-mounted controller uses the initial target current demand value I of the primary coil_p-reqSending;

the target current demand value I required to be achieved by the primary side coil is obtained_p-reqAfter the step (b) and the step (c) of determining the actual value of the current I achieved by the primary coil_p-facWhether the target current demand value I is reached_p-reqBefore the step (2) further comprising:

sending a charging starting request according to a charging request sent by a vehicle controller;

initializing a voltage control parameter of an internal control circuit and a phase-shifting angle of an inverter according to a starting charging request;

setting the initial voltage control parameter of the internal circuit and the initial phase shift angle of the inverter to minimum values.

The invention further provides a wireless charging system, which comprises a memory, a processor and a wireless charging control program which is stored on the memory and can be run on the processor, wherein the processor implements the steps of the wireless charging control method when executing the wireless charging control program.

The present invention also provides a storage medium having a wireless charging control program stored thereon, wherein the wireless charging control program, when executed by a processor, implements the steps of the wireless charging control method according to any one of the above-mentioned embodiments.

The technical scheme of the invention is used for controlling wireless charging, the wireless charging control method is applied to a wireless charging control system, the wireless charging control system comprises a infrastructure side and a vehicle side, and the infrastructure sideThe wireless charging control method comprises the following steps: obtaining an initial target current demand value I required to be reached by a primary coil_p-req(ii) a According to the acquired initial target current demand value I_p-reqAdjusting the actual value of the output current I of the primary coil_p-fac(ii) a Judging the actual current value I of the primary coil_p-facCorresponding actual value I of system output current_out-facWhether the vehicle-mounted side current demand value is reached or not; controlling the system to output an actual current value I according to the judgment result_out-fac. The parameters transmitted by the wireless charging control method on the infrastructure side and the vehicle-mounted side in the wireless charging system are only I_pThe value of the current value is used, so that closed-loop control between the infrastructure side and the vehicle side is simple, the target current required value can be effectively guaranteed to be equal to the current actual output value for charging, and the wireless charging system is guaranteed to meet the requirement of charging the kick ball.

Drawings

Fig. 1 is a schematic diagram of a hardware structure of wireless charging according to an embodiment of the present invention;

fig. 2 is a functional block diagram of an embodiment of a wireless charging system according to the present invention;

fig. 3 is a schematic circuit block diagram of an embodiment of a wireless charging system according to the present invention;

fig. 4 is a schematic diagram of an equivalent T-network of circuit modules of an embodiment of the wireless charging system of the present invention;

fig. 5 is a flowchart illustrating a wireless charging control method according to an embodiment of the invention;

fig. 6 is a flowchart illustrating a wireless charging control method according to another embodiment of the present invention;

fig. 7 is a flowchart illustrating a wireless charging control method according to another embodiment of the present invention;

fig. 8 is a flowchart illustrating a wireless charging control method according to another embodiment of the present invention;

fig. 9 is a flowchart illustrating a wireless charging control method according to another embodiment of the present invention;

fig. 10 is a flowchart illustrating a wireless charging control method according to another embodiment of the present invention;

fig. 11 is a flowchart illustrating a wireless charging control method according to another embodiment of the present invention.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				10	Capital construction side	Ls	Secondary coil
100	Internal control circuit	Lp	Primary coil
				110	PFC circuit	20	Vehicle side
120	Inverter with a voltage regulator	210	Secondary side resonant network
				130	Primary side resonant network	220	Full-bridge rectifier circuit
150	Primary side input voltage	300	Vehicle controller
				160	BUCK circuit

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The main solution of the present invention is to obtain the initial target current demand value I that the primary coil L p needs to reach_p-req(ii) a According to the acquired initial target current demand value I_p-reqAdjusting the actual value I of the output current of the primary coil L p_p-facJudging the actual current value I of the primary coil L p_p-facCorresponding actual value I of system output current_out-facWhether the vehicle-mounted side 20 current demand value is reached; controlling the system to output an actual current value I according to the judgment result_out-fac。

The technical scheme is used for controlling wireless charging, the wireless charging control method is applied to a wireless charging control system, the wireless charging control system comprises a infrastructure side 10 and a vehicle side 20, the infrastructure side 10 is provided with an internal control circuit 100 and a primary side coil L p, the internal control circuit 100 comprises a PFC circuit 110, a BUCK circuit 160 and an inverter circuit, the vehicle side 20 is provided with a secondary side coil L s and a full-bridge rectification circuitThe wireless charging control method of the current circuit 220 comprises the steps of obtaining an initial target current demand value I that the primary coil L p needs to reach_p-req(ii) a According to the acquired initial target current demand value I_p-reqAdjusting the actual value I of the output current of the primary coil L p_p-facJudging the actual current value I of the primary coil L p_p-facCorresponding actual value I of system output current_out-facWhether the vehicle-mounted side 20 current demand value is reached; controlling the system to output an actual current value I according to the judgment result_out-fac. The parameters transmitted by the wireless charging control method of the invention on the infrastructure side 10 and the vehicle-mounted side 20 in the wireless charging system are only I_pThe value of (3) enables closed-loop control between the infrastructure side 10 and the vehicle side 20 to be simple, can effectively ensure that the target current demand value is equal to the current actual output value for charging, and ensures that the wireless charging system meets the charging demand.

As an embodiment, the wireless charging control system may be as shown in fig. 1.

The embodiment scheme of the invention relates to a wireless charging control system, which comprises: a processor 1001, such as a CPU, a communication bus 1002, and a memory 1003. Wherein a communication bus 1002 is used to enable connective communication between these components.

The memory 1003 may be a high-speed RAM memory or a non-volatile memory (e.g., a disk memory). As shown in fig. 1, a wireless charging control program may be included in the memory 1003 as a kind of computer storage medium; and the processor 1001 may be configured to call the wireless charging control program stored in the memory 1003, and perform the following operations:

obtaining an initial target current demand value I that the primary coil L p needs to reach_p-req；

According to the acquired initial target current demand value I_p-reqAdjusting the actual value I of the output current of the primary coil L p_p-fac；

Judging the actual current value I of the primary coil L p_p-facCorresponding actual value I of system output current_out-facWhether the current demand of the vehicle-mounted side 20 is metA value;

Alternatively, the processor 1001 may be configured to call the wireless charging control program stored in the memory 1003, and perform the following operations:

if so, the state of the infrastructure side 10 is maintained, and the actual value I of the current of the primary coil L p is maintained_p-facSupplying power;

if not, the duty ratio of the full-bridge rectification circuit 220 is kept, and the target current demand value I is adjusted_p-reqAccording to the adjusted target current demand value I_p-reqChanging the actual value of the current I of the primary coil L p_p-facSo that the actual value of the current I is changed_p-facCorresponding actual value I of the system output current_out-facThe vehicle side 20 current demand value is reached.

judging the actual current value I reached by the primary coil L p_p-facWhether the target current demand value I is reached_p-req；

If yes, the state of the capital construction side 10 is kept, and the actual current value I is kept_p-facSupplying power;

if not, according to the acquired target current demand value I_p-reqAdjusting actual value of output current I of primary coil L p_p-facTo achieve the target current demand value I_p-req。

the voltage of the internal control circuit 100 and/or the phase shift angle of the inverter 120 is adjusted.

detecting the voltage of the regulated internal control circuit 100 and/or the phase shift angle of the inverter 120Current actual value I of current primary side coil L p_p-fac；

Judging the current actual value I of the current primary coil L p_p-facCorresponding actual value I of system output current_out-facIs equal to the system output current demand value I_out-req；

If yes, the state of the infrastructure side 10 is maintained, and the current actual value I of the current primary side coil L p is maintained_p-facAnd (5) supplying power.

adjusting the duty cycle of BUCK circuit 160; and/or

The duty cycle of the PFC circuit 110 is adjusted.

if not, the voltage of the current internal control circuit 100 and the phase shift angle of the current inverter 120 are both determined to reach the threshold value, and/or the current demand value I of the current primary coil L p_p-reqWhether a threshold value is reached;

if not, continuing to execute the target current demand value I according to the acquired target current demand value I_p-reqAdjusting actual value of output current I of primary coil L p_p-facUntil the current actual value I of the current primary coil L p_p-facCorresponding actual value I of system output current_out-facIs equal to the system output current demand value I_out-req；

If yes, the state of the capital construction side 10 is kept, and the current actual current value I is kept_p-facSupplying power and adjusting the duty ratio of the full-bridge rectifying circuit 220 according to the adjusting request;

detecting the actual value I of the system output current corresponding to the duty ratio of the adjusted full-bridge rectification circuit 220_out-facAnd judging whether the current is equal to the current system output current demand value I_out-req；

If yes, the state of the capital construction side 10 is kept, and the current actual current value I is kept_p-facIs supplied with power and is maintained asThe duty cycle of the front full bridge rectifier circuit 220.

if not, the duty cycle of the full-bridge rectification circuit 220 is adjusted again, and whether the duty cycle of the full-bridge rectification circuit 220 after the adjustment again reaches the minimum duty cycle value is judged;

if yes, stopping charging or low-power output charging;

if not, detecting the actual value I of the system output current corresponding to the duty ratio of the full-bridge rectification circuit 220 after readjustment_out-facAnd judging whether the current is equal to the system output current demand value I_out-req；

If so, maintaining the state of the infrastructure side 10, and maintaining the current duty ratio power supply of the full-bridge rectification circuit 220;

if not, all the steps of adjusting the duty ratio of the full-bridge rectification circuit 220 again and judging whether the duty ratio of the full-bridge rectification circuit 220 after secondary adjustment reaches the minimum value of the duty ratio are carried out until the actual value I of the output current of the system_out-facEqual to system output current demand value I_out-req。

if not, keeping the target current demand value I_p-reqAdjusting the duty cycle of the full-bridge rectifier circuit 220;

If so, keeping the duty ratio of the full-bridge rectification circuit 220 to supply power;

if not, the duty ratio of the full-bridge rectification circuit 220 is continuously adjusted until the actual value I of the system output current_out-facEqual to the current system output current demand value I_out-req。

if not, the duty ratio of the full-bridge rectification circuit 220 is adjusted, and meanwhile, the target current requirement value I which is required to be reached by the primary coil L p is adjusted_p-req；

If so, keeping the duty ratio of the full-bridge rectification circuit 220 and the state of the infrastructure side 10 for power supply;

if not, the duty ratio of the full-bridge rectification circuit 220 is continuously adjusted and the target current demand value I required to be reached by the primary coil L p is adjusted_p-reqUntil the actual value of the system output current I_out-facEqual to the current system output current demand value I_out-req。

initializing a system state according to a charging request issued by the vehicle controller 300;

determining the initial value of the duty ratio of the full-bridge rectification circuit 220 and the initial target current demand value I of the primary coil L p according to the system state_p-req；

The vehicle-mounted controller uses the initial target current demand value I of the primary coil L p_p-reqAnd (5) sending.

transmitting a start charging request according to a charging request transmitted from the vehicle controller 300;

initializing a voltage control parameter of the internal control circuit 100 and a phase shift angle of the inverter 120 according to the start-up charging request;

the initial voltage control parameter of the internal circuit and the initial phase shift angle of the inverter 120 are both set to a minimum value.

The invention provides a wireless charging control method, which is applied to a wireless charging system.

The infrastructure side 10 of the wireless charging system is installed under the ground, the vehicle side 20 is installed on the vehicle, and when charging is performed, the driver drives the vehicle to a designated position, and the wireless charging system is turned on to perform charging. The electric vehicle wireless charging mainly utilizes the principle of electromagnetic induction coupling, when the primary side resonant network 130 and the secondary side resonant network 210 are adjusted to be at a uniform resonant frequency, the two resonant networks generate resonance, energy is transmitted to the vehicle-mounted side 20 from the infrastructure side 10, and the power grid energy of the infrastructure side 10 is transmitted to the vehicle-mounted side 20 battery in a non-contact mode, so that the wireless charging is realized.

The primary side resonant network 130 comprises a primary side coil L p and a primary side compensation network, the secondary side resonant network 210 comprises a secondary side coil L s and a secondary side compensation network, wherein the primary side coil L p and the secondary side coil L s form a loose coupling transformer to achieve energy transmission and energy reception, the shapes of the loose coupling transformer and the secondary side compensation network are not limited, the loose coupling transformer and the secondary side resonance network can be a circular coil, a rectangular coil, a D-shaped coil and the like, an air gap between the two coils is large, the loose coupling transformer and the secondary side resonance network has the characteristics of large leakage inductance and small excitation inductance, and the power factor of the whole system is low.

Fig. 5 is a flowchart illustrating a wireless charging control method according to an embodiment of the invention.

Referring to fig. 2 to 5, in an embodiment, the wireless charging control method is applied to a wireless charging control system, the wireless charging control system includes a infrastructure side 10 and a vehicle side 20, the infrastructure side 10 is provided with a primary coil L p, and the wireless charging control method includes the following steps:

step S10, obtaining the initial target current demand value I needed by the primary coil L p_p-reqThe wireless charging system comprises a primary side 10 and a secondary side 20, wherein the primary side converts Direct Current (DC) into high-frequency current at a fixed switching frequency f0, and converts electric energy into magnetic energy through a primary coil L p of a loose coupling transformer, the secondary side circuit adjusts system resonance parameters or output power in a phase-shifting or duty ratio adjustment mode and converts the magnetic energy into electric energy, and when the electric automobile needs to be charged, the primary side can send a target current demand value I to a primary coil L p_p-reqSo that the infrastructure side 10 obtains a desired output current value, i.e. a target current demand value I to be reached_p-req。

Step S20, obtaining the initial target current demand value I_p-reqAdjusting the actual value I of the output current of the primary coil L p_p-facIn the embodiment, the Ip value can be transmitted by setting a wireless communication circuit, the wireless communication circuit can be a coupling circuit formed by the secondary coil L s and the primary coil L p, the vehicle-mounted detection control circuit can transmit current information to a sampling control circuit in the infrastructure internal control circuit 100 through the secondary coil L s, the infrastructure sampling control circuit adjusts output voltage by controlling the PFC circuit 110 and/or the DC-DC circuit and/or the inverter circuit to adjust the current of the primary coil L p of the transformer, and the wireless communication circuit can also adopt a wireless communication circuit such as a WIFI module, a radio frequency module, a bluetooth module and the like which can be used for receiving and transmitting signals.

Step S30, determining the primary coil LActual value of p_p-facCorresponding actual value I of system output current_out-facFor example, when the quotient is adopted, the actual value of the system output current is divided by the current demand value of the vehicle-mounted side 20, and when the obtained result is between 0.9 and 1.1, the actual value of the system output current is considered to be equal in magnitude (namely the actual value of the system output current reaches the current demand value of the vehicle-mounted side 20), otherwise, the actual value of the system output current is considered to be not equal in magnitude (namely the actual value of the system output current does not reach the current demand value of the vehicle-mounted side 20), the detection error of a sensor is considered, or the influence of a transmission signal is considered, the interval of the quotient result can be properly adjusted, and the operation of the wireless charging system can be conveniently and well controlled.

Step S40, controlling the system to output the actual value I of the current according to the judgment result_out-fac. The judgment result may be that the system output current actual value reaches the vehicle-mounted side 20 current demand value or that the system output current actual value does not reach the vehicle-mounted side 20 current demand value. In one implementation scenario, if the actual system output current reaches the on-board-side 20 current demand value, the user may choose to charge as the current wireless charging system state, or to re-match the charge by setting a new on-board-side 20 current demand value. In another implementation scenario, if the system output current actual value does not reach the vehicle-side 20 current demand value, the system output current actual value is adjusted appropriately so that the system output current actual value reaches the vehicle-side 20 current demand value to meet the charging demand.

Since the position of the vehicle and the infrastructure side 10 may affect the specific charging of the vehicle to some extent, it can be understood that the electric energy actually received by the vehicle is the actual output value of the wireless charging system. In one implementation scenario, the initial target demand value I_p-reqCan be 10A, originalActual value of current I of side coil L p_p-facAdjust to the initial target required value 10A, at which time, the corresponding system output current actual value I_out-facPossibly 5A, assuming that the current demand value of the vehicle-mounted side 20 is 5A, at this time, the charging demand is satisfied; assuming that the current demand of the vehicle-mounted side 20 is 30A, the charging demand is not satisfied at this time.

The technical scheme is used for controlling wireless charging, the wireless charging control method is applied to a wireless charging control system, the wireless charging control system comprises a infrastructure side 10 and a vehicle side 20, the infrastructure side 10 is provided with an internal control circuit 100 and a primary coil L p, the internal control circuit 100 comprises a PFC circuit 110, a BUCK circuit 160 and an inverter circuit, the vehicle side 20 is provided with a secondary coil L s and a full-bridge rectifier circuit 220, and the wireless charging control method comprises the following steps of obtaining an initial target current demand value I required to be reached by the primary coil L p_p-req(ii) a According to the acquired initial target current demand value I_p-reqAdjusting the actual value I of the output current of the primary coil L p_p-facJudging the actual current value I of the primary coil L p_p-facCorresponding actual value I of system output current_out-facWhether the vehicle-mounted side 20 current demand value is reached; controlling the system to output an actual current value I according to the judgment result_out-fac. The parameters transmitted by the wireless charging control method of the invention on the infrastructure side 10 and the vehicle-mounted side 20 in the wireless charging system are only I_pThe value of (3) enables closed-loop control between the infrastructure side 10 and the vehicle side 20 to be simple, can effectively ensure that the target current demand value is equal to the current actual output value for charging, and ensures that the wireless charging system meets the charging demand.

Referring to fig. 6, in some embodiments of the present invention, the system is controlled to output the actual current value I according to the determination result_out-facComprises the following steps:

step S41, if yes, the state of the infrastructure side 10 is maintained, and the actual current value I of the primary coil L p is maintained_p-facSupplying power; when the actual value of the system output current reaches the current demand value of the vehicle-mounted side 20, namely the wireless charging system meets the charging demand, the infrastructure side 10 is controlled to keep the current stateAnd supplying power in a state, wherein the current state is maintained, that is, the power is supplied while the values of all the current control parameters of the infrastructure side 10 are kept unchanged. In an embodiment, the infrastructure side 10 may include control parameters such as power supply power, phase shift angle, voltage frequency, etc., and the infrastructure side 10 maintains these control parameters to supply power after confirming that the wireless charging system is satisfying the charging requirement.

Step S42, if not, keeping the duty ratio of the full-bridge rectification circuit 220, and adjusting the target current demand value I_p-reqAccording to the adjusted target current demand value I_p-reqChanging the actual value of the current I of the primary coil L p_p-facSo that the actual value of the current I is changed_p-facCorresponding actual value I of the system output current_out-facWhen the wireless charging system supplies power to the vehicle, because the wireless charging system does not actually know how much current is needed to fit the vehicle, the first obtained initial target current demand value I required to be reached by the primary coil L p is obtained_p-reqIt is understood to be a reference quantity which can be set to a lower value. After the current difference value between the wireless charging system and the vehicle is obtained through the reference quantity, the target current demand value I can be adjusted_p-reqThe current of the primary coil L p is changed, and a new actual value I of the system output current is correspondingly obtained_out-facDetecting the new actual value I of the system output current_out-facAnd then comparing with the current demand value of the vehicle-mounted side 20 until the two are equal in value, so as to meet the charging demand.

In one implementation scenario, assuming that the vehicle-mounted side 20 requires a current value of 30A and an initial target current requirement value of 10A, the actual system output value corresponding to the current of the primary coil L p adjusted according to the initial current value is 5A, and does not meet the charging requirement_p-reqTo 40A or 65A, the target current demand value I is adjusted_p-reqChanging the actual value of the current I of the primary coil L p_p-facSo that the actual value of the current I of the primary coil L p_p-facTo 40A or 65A, and the corresponding actual value of the system output current may reach 30A, so as to meet the charging requirement.

Referring to FIG. 7, in some embodiments of the present invention, the target current demand value I is obtained according to_p-reqAdjusting the actual value I of the output current of the primary coil L p_p-facComprises the following steps:

step S21, determining the actual current value I that the primary coil L p reaches_p-facWhether the target current demand value I is reached_p-req(ii) a Specifically, the size relationship between the two can be determined by making a difference or a quotient, so that the result of making a difference or a quotient is used as the determination of the size relationship. For example, when the quotient is adopted, the target current demand value I is set_p-reqDivided by the actual value of the current I_p-facWhen the obtained result is between 0.9 and 1.1, the two can be considered to be equal in magnitude (i.e. the actual value of the current I)_p-facReaching the target current demand value I_p-req) Otherwise, the two values are considered to be unequal (i.e. the actual value of the current I is equal to_p-facNot fulfilling the target current demand value I_p-req). Considering the detection error of the sensor or the influence when transmitting the signal, the interval of the quotient result can be properly adjusted, as long as the operation of the wireless charging system is well controlled.

Step S22, if yes, maintaining the state of the infrastructure side 10, and maintaining the current actual value I_p-facSupplying power;

step S23, if not, according to the acquired target current demand value I_p-reqAdjusting actual value of output current I of primary coil L p_p-facTo achieve the target current demand value I_p-req. When the actual value of the current I is judged_p-facNot fulfilling the target current demand value I_p-reqThen, the current demand current value is not matched with the actual current value, and the current demand value I is obtained according to the current_p-reqAdjusting actual value I of current of primary coil L p_p-facTo make electricityActual value of flow I_p-facThe target current demand value I_p-reqThe magnitude relation of (a) is adaptively adjusted.

In some embodiments of the invention, the target current demand value I is obtained according to the current demand value_p-reqAdjusting the actual value I of the output current of the primary coil L p_p-facComprises the following steps:

in step S231, the voltage of the internal control circuit 100 and/or the phase shift angle of the inverter 120 are adjusted.

Phase shift angle α and input voltage U_dcOutput voltage U_inThe relationship is as follows:

therefore, by adjusting the phase shift angle α, the output voltage of the inverter circuit can be adjusted, and the primary coil current Ip. and the voltage U of the internal control circuit 100 can be further adjusted_dcThe actual value is equal to the product of the primary input voltage 150 and the duty cycle thereof, so that the voltage of the internal control circuit 100 can be changed by changing the duty cycle under the condition that the primary input voltage 150 is not changed, so as to adjust the actual value of the current, and further enable the actual value to be matched with the required value of the current.

Specifically, the internal control circuit 100 comprises a BUCK circuit 160 and a PFC circuit 110, the input of the PFC circuit 110 is a national standard grid single-phase or three-phase power, the PFC circuit 110 can be realized by a PFC switch, a diode, an inductor and other components, the PFC circuit 110 can be realized by an active PFC circuit 110 or a passive PFC circuit 110, the PFC circuit 110 can be a boost PFC circuit 110 or a BUCK PFC circuit 110, or the boost PFC circuit 110, the PFC circuit 110 performs power factor correction and rectification on an input alternating current, the rectified direct current is output to the BUCK circuit 160 and further connected to an input end of an inverter circuit, the BUCK circuit 160 can comprise a switch tube, a diode, a capacitor and an inductor, the BUCK circuit 160 is a BUCK chopper, an average value Uo of an output voltage of the BUCK converter is always smaller than the output voltage UD, the inductor L and the capacitor C form a low-pass filter, and the filter is designed by the low-pass filterThe principle is to let the direct current component of us (t) pass, and to suppress the harmonic component of us (t); the output voltage uo (t) on the capacitor is the direct current component of us (t) and then a micro ripple wave uri (t) is added; the inverter circuit integrates four power switch tubes (S1-S4) which form a two-phase inverter bridge circuit. Each power switch tube can be realized by adopting an MOS tube or an IGBT. The inverter circuit is used for realizing DC/AC conversion, namely converting direct current into high-frequency alternating current. At this time U_dcI.e. the sum of the voltage of the BUCK circuit 160 and the voltage of the PFC circuit 110, the step of adjusting the voltage of the internal control circuit 100 includes:

adjusting the duty cycle of BUCK circuit 160; by adjusting the different duty cycles D, an adjustment of the output voltage can be achieved. The duty ratio of the BUCK circuit 160 can be adjusted according to the existing scheme, which is not described herein. At this time, the adjusted voltage of the internal control circuit 100 can be obtained by calculation according to the duty ratio of the adjusted BUCK circuit 160; due to U_buck-out＝U_buck-in*/(1-D_buck) In U at_buck-inMainly under the influence of the primary side input voltage 150 (i.e., when the primary side input voltage 150 keeps constant, the value is constant), the duty cycle of the BUCK circuit 160 is changed to change the voltage output by the BUCK circuit 160, and the BUCK circuit 160 belongs to a part of the internal control circuit 100, so that the voltage of the internal circuit is changed, and the actual value of the current is further changed.

Adjusting the duty cycle of the PFC circuit 110; by adjusting the different duty cycles D, an adjustment of the output voltage can be achieved. The duty ratio of the PFC circuit 110 may be adjusted according to a conventional scheme, which is not described herein. At this time, the adjusted voltage of the internal control circuit 100 can be calculated according to the adjusted duty ratio of the PFC circuit 110. Due to U_pfc-out＝U_pfc-in*/(1-D_pfc) In U at_pfc-inMainly under the influence of the primary input voltage 150 (i.e., when the primary input voltage 150 keeps constant, the value is constant), the duty cycle of the PFC circuit 110 is changed to change the voltage output by the PFC circuit 110, and the PFC circuit 110 belongs to a part of the internal control circuit 100, thereby changing the voltage U of the internal circuit_dcThe actual value of the current is further changed.

It can be understood that adjusting the duty cycle of the BUCK circuit 160, the duty cycle of the PFC circuit 110, and the phase shift angle of the inverter circuit can change the actual current value, and the embodiment of the present invention includes a scheme of adjusting only one of the foregoing three parameters, that is, adjusting only the duty cycle of the BUCK circuit 160 or the duty cycle of the PFC circuit 110 or the phase shift angle of the inverter circuit, so that the control variables of the actual current value are few, which is convenient for control; in the embodiment of the invention, the scheme of only adjusting any two of the three parameters is also included, the actual current value can be changed in a larger interval by adjusting the two parameters, and the matching efficiency and the matching result of the actual current value and the required current value are improved; and in the embodiment of the invention, the scheme of only adjusting the three parameters is also included, the actual current value can be changed to the greatest extent by adjusting the three parameters, and the matching efficiency and the matching result of the actual current value and the required current value are greatly improved. Further, the embodiments of the present invention may also sequentially adjust the values of the three parameters, so as to achieve the adjustment of the actual current value all over, and improve the matching between the actual current value and the target current required value, specifically, the duty ratio of the BUCK circuit 160 may be adjusted first, then the duty ratio of the PFC circuit 110 may be adjusted, and finally the phase shift angle of the inverter circuit may be adjusted, or the combination of the foregoing methods may all effectively change the actual current value, which is within the protection scope of the present invention.

Referring to fig. 9, in some embodiments of the present invention, the step of adjusting the voltage of the internal control circuit 100 and/or the phase shift angle of the inverter 120 further includes:

step S232, detecting the adjusted voltage of the internal control circuit 100 and/or the current actual value I of the current primary coil L p corresponding to the phase shift angle of the inverter 120_p-fac；

Step S233, the current actual value I of the current primary coil L p is determined_p-facCorresponding actual value I of system output current_out-facIs equal to the system output current demand value I_out-req；

Step S234, if yes, the step is keptThe state of the infrastructure side 10 is such that the actual value of the current I of the current primary winding L p is maintained_p-facSupplying power; directly detecting the actual value I of the system output current after the control parameters are adjusted_out-facSpecifically, the reading can be performed by setting a sensor or an oscilloscope. By adjusting the regulated system output current actual value I_out-facAND system output current demand value I_out-reqIn contrast, it can be understood that the system output current demand value is the current demand value of the vehicle-mounted side 20, so that it can be determined whether the system satisfies the charging demand. It can be understood that the system outputs the actual value of the current I_out-facAND system output current demand value I_out-reqThe size comparison can be performed according to difference or quotient comparison, and the foregoing form can be referred to specifically, which is not described herein again.

In this embodiment, the actual value I of the system output current is changed by adjusting the control parameter of the primary side of the infrastructure side 10_out-facThe adjusted current actual value I of the system output current is used_out-facAND system output current demand value I_out-reqAnd comparing to know whether the current invalid charging system meets the charging requirement.

In some embodiments of the invention, the determination is made of the actual value of current I of the current primary winding L p_p-facCorresponding actual value I of system output current_out-facIs equal to the system output current demand value I_out-reqFurther comprising after the step of:

step S235, if not, determining whether the current voltage of the internal control circuit 100 and the current phase shift angle of the inverter 120 both reach the threshold, and/or the current demand value I of the current primary winding L p_p-reqWhether a threshold value is reached; it can be understood that, when the internal control circuit 100 includes the BUCK circuit 160, that is, the duty ratio of the current BUCK circuit 160 is compared with the duty ratio threshold of the BUCK circuit 160, the determination manner may be a quotient or a difference, which is specifically referred to above. The threshold may include a maximum value of the duty ratio of the BUCK circuit 160 and a minimum value of the duty ratio of the BUCK circuit 160, or a value set by a user according to an actual requirement, as long as the actual value of the current is conveniently controlled; and the number of the first and second groups,when the internal control circuit 100 includes the PFC circuit 110, that is, the duty ratio of the PFC circuit 110 is compared with the threshold of the PFC circuit 110, and the determination manner may be a quotient or a difference, which is specifically referred to above. The threshold may include a maximum value of the duty ratio of the PFC circuit 110 and a minimum value of the duty ratio of the PFC circuit 110, or a value set by a user according to an actual requirement, as long as the actual value of the current is conveniently controlled. By judging the relationship between the control parameter of the current actual value and the threshold value, whether the adjustment of the current actual value for matching the target current required value reaches the limit or not can be known, so that the next work is facilitated, and the matching degree of the target current required value and the current actual value is improved. And judging whether the current required value obtains a threshold value, namely judging whether the control parameters on the primary side all reach the threshold value in the step, thereby obtaining whether the primary side can be adjusted.

Step S236, if not, continuing to execute the step I according to the acquired target current demand value I_p-reqAdjusting actual value of output current I of primary coil L p_p-facUntil the current actual value I of the current primary coil L p_p-facCorresponding actual value I of system output current_out-facIs equal to the system output current demand value I_out-req；

If not, the judgment can be made that the adjustment of the actual current value for matching the target current demand value does not reach the limit, so that the control parameter for adjusting the actual current value can be continuously executed, and the actual current value can be changed. Specific modifications can be made with reference to the foregoing, for example, when the duty ratio of the BUCK circuit 160 is adjusted to find that the actual current value does not match the target current demand value (e.g., the actual current value is smaller than the target current demand value), the duty ratio of the BUCK circuit 160 can be increased to increase U_dcAnd then the actual current value is increased, but the duty cycle of the BUCK circuit 160 is increased to find that the actual current value still does not match the target current demand value (for example, the actual current value is smaller than the target current demand value), at this time, whether the duty cycle of the BUCK circuit 160 reaches the maximum value is judged, and if the maximum value is not reached, the step of increasing the duty cycle of the BUCK circuit 160 is continued until the BUCK circuit reaches the maximum value160, when the duty cycle of the BUCK circuit 160 reaches a maximum value, if the actual current value still does not reach the target current demand value, the duty cycle of the PFC circuit 110 may then be adjusted to increase U_dcAnd then increasing the current actual value, but increasing the duty cycle of the PFC circuit 110 finds that the current actual value still does not match the target current demand value (e.g., the current actual value is smaller than the target current demand value), at this time, it is determined whether the duty cycle of the PFC circuit 110 reaches the maximum value, if not, the step of increasing the duty cycle of the PFC circuit 110 is continued until the maximum value of the PFC circuit 110 is reached, and when the duty cycle of the PFC circuit 110 and the duty cycle of the BUCK circuit 160 both reach the maximum values, if the current actual value still does not reach the target current demand value (e.g., the current actual value is smaller than the target current demand value), the phase shift angle of the inverter circuit may be decreased, thereby increasing the current actual value, but after decreasing the phase shift angle, it finds that the current actual value still does not match the target current demand value (e.g, at the moment, whether the phase shift angle reaches the minimum value can be judged, if not, the phase shift angle of the inverter circuit can be reduced, and then the actual value of the current is improved until the phase shift angle of the inverter circuit reaches the minimum value. It is understood that the foregoing is only a regulation form in one case, the duty ratio of the BUCK circuit 160, the duty ratio of the PFC circuit 110, and the phase shift angle of the inverter circuit may be changed according to actual conditions, and when the relationship between the current actual value and the target current demand value is other relationship (for example, the current actual value is greater than the target current demand value), the variability adjustment is made with reference to the foregoing regulation form, so that the current actual value approaches the target current demand value. In one embodiment, the specific parameter control can be found in the following table:

TABLE 1 output Power control flow parameter states at jump

In Table 1, U_BUCKAnd U_PFC Are BUCK circuits 160 respectivelyAnd the output voltage, X, of the PFC circuit 110_{xx_max}、X_{xx_min}、X_{xx_fac}Respectively representing the maximum value, the minimum value and the intermediate arbitrary value of the parameter.

Step S237, if yes, the state of the capital construction side 10 is maintained, and the current actual current value I is maintained_p-facSupplying power and adjusting the duty ratio of the full-bridge rectifying circuit 220 according to the adjusting request; if so, it can be determined that the adjustment of the actual current value for matching the target current demand value has reached the limit, and the actual current value cannot be matched with the target current demand value by adjusting the control parameter for controlling the actual current value, and at this time, the duty ratio of the full-bridge rectifier circuit 220 is adjusted according to the adjustment request. Specifically, the corresponding relationship between the request command and the duty cycle of the BUCK circuit 160, the duty cycle of the PFC circuit 110, and the phase shift angle of the inverter circuit when all reach the threshold value may be established, so that the request command may be sent in time when the duty cycle of the BUCK circuit 160, the duty cycle of the PFC circuit 110, and the phase shift angle of the inverter circuit reach the threshold value, and reduction of the required current of the vehicle-mounted side 20 caused by erroneous judgment is avoided.

Step S238, detecting the actual system output current value I corresponding to the adjusted duty ratio of the full-bridge rectification circuit 220_out-facAnd judging whether the current is equal to the current system output current demand value I_out-req(ii) a In this embodiment, the actual value I of the system output current in the current state is redetected_out-facBy adjusting the adjusted current actual system output current value I_out-facAND system output current demand value I_out-reqAnd comparing to know whether the current invalid charging system meets the charging requirement. It will be appreciated that the present system outputs an actual value of the current I_out-facAND system output current demand value I_out-reqThe size comparison can be performed according to difference or quotient comparison, and the foregoing form can be referred to specifically, which is not described herein again.

Step S239, if yes, keeping the state of the capital construction side 10 and keeping the current actual current value I_p-facPower is supplied and the duty cycle of the current full-bridge rectification circuit 220 is maintained.

In this embodiment, whether the control parameter on the primary side reaches or not is determinedWhen the threshold value is reached, whether the actual output current of the system can be changed through the primary side is judged, and when the primary side can be adjusted, the primary side is continuously adjusted; if the primary side can not be adjusted, the actual value I of the system output current is changed by adjusting the duty ratio of the full-bridge rectification circuit 220_out-facFurther changing the actual value I of the system output current_out-facAND system output current demand value I_out-reqAnd the wireless charging system can meet the charging requirement.

Referring to fig. 9, in some embodiments of the present invention, the detecting of the actual system output current value I corresponding to the duty cycle of the adjusted full-bridge rectification circuit 220_out-facAnd judging whether the current is equal to the current system output current demand value I_out-reqFurther comprising after the step of:

step S2310, if not, adjusting the duty cycle of the full-bridge rectification circuit 220 again, and judging whether the duty cycle of the full-bridge rectification circuit 220 after being adjusted again reaches the minimum duty cycle value; when the actual value I of the system output current corresponding to the duty ratio of the full-bridge rectification circuit 220 is adjusted_out-facIs still not equal to the system output current demand value I_out-reqWhen the system is used, the duty ratio of the full-bridge rectification circuit 220 can be adjusted again, and the duty ratio of the full-bridge rectification circuit 220 can reach a threshold value due to the fact that the duty ratio of the full-bridge rectification circuit 220 is adjusted for the second time, namely the actual value of the output current of the system can not be adjusted on the secondary side, so that the numerical value of the duty ratio of the full-bridge rectification circuit 220 is judged, and the efficiency and the accuracy of system adjustment are guaranteed.

Step S2311, if yes, stopping charging or low power output charging; at this time, it can be confirmed that the charging system cannot meet the charging demand, so that the charging is controlled to stop, or low-power charging is adopted.

Step S2312, if not, detecting a system output current actual value I corresponding to the duty ratio of the full-bridge rectification circuit 220 after readjustment_out-facAnd judging whether the current is equal to the system output current demand value I_out-req(ii) a The duty cycle of the re-adjusted full-bridge rectification circuit 220 does not reach the minimum duty cycle, that is, the secondary side can still be adjusted to change the system outputThe actual value, wireless charging system can also satisfy the demand of charging through the adjustment. When the duty ratio of the full-bridge rectification circuit 220 is adjusted again, the updated system output current demand value I is obtained again_out-reqAnd judging the system output current demand value I again_out-reqAND system output current demand value I_out-reqThe relationship (2) of (c).

Step S2313, if yes, maintaining the state of the infrastructure side 10, and maintaining the current duty cycle power supply of the full-bridge rectifier circuit 220; if the system outputs the current demand value I_out-reqAND system output current demand value I_out-reqAnd if the target current requirement value is equal to the current actual value, and the charging requirement can be met by keeping the current full-bridge rectification circuit 220 powered by the duty ratio.

Step S2314, if not, all steps of adjusting the duty ratio of the full-bridge rectification circuit 220 again and judging whether the duty ratio of the full-bridge rectification circuit 220 after secondary adjustment reaches the minimum value of the duty ratio are carried out until the actual value I of the system output current_out-facEqual to system output current demand value I_out-req. If not, the actual value I of the output current of the system after readjustment_out-facNor with the system output current demand value I_out-reqIf the actual value of the output current of the system is equal to the actual value of the output current of the system, all the steps of adjusting the parameters of the actual value of the output current of the control system are executed again, specifically referring to the aforementioned adjusting mode, one parameter can be adjusted, or multiple parameters can be adjusted simultaneously, or certain parameters can be adjusted in sequence, and the specific adjusting direction (increasing or decreasing) is carried out according to the actual situation until the actual value of the output current I of the system is reached_out-facAND system output current demand value I_out-reqAnd the charging requirement is met.

In this embodiment, a new actual value I of the system output current is obtained by adjusting the duty ratio of the full-bridge rectification circuit 220_out-facIf the new system output current actual value I_out-facAND system output current demand value I_out-reqIf the difference is not consistent, the duty ratio of the full-bridge rectification circuit 220 is adjusted again, whether the duty ratio of the full-bridge rectification circuit 220 reaches the minimum value or not is judged, if yes, the charging requirement cannot be met is judged, and the charging requirement cannot be metWhen the system output current is not adjusted, the updated system output current actual value I corresponding to the duty ratio of the full-bridge rectification circuit 220 after readjustment can be obtained again_out-facAnd judging whether the current is equal to the actual value I of the system output current_out-facIf the actual value I of the system output current can not be realized_out-facAND system output current demand value I_out-reqIf the actual value of the system output current is consistent with the actual value of the system output current, all the steps of controlling the parameters of the actual value of the system output current (including the step of comparing the duty ratio of the full-bridge rectifying circuit 220 with the minimum value) are executed again until the actual value of the system output current I is obtained_out-facAND system output current demand value I_out-reqAnd the charging requirement is met.

Referring to fig. 10, in some embodiments of the present invention, the system is controlled to output the actual current value I according to the determination result_out-facFurther comprising the steps of:

step S41a, if not, keeping the target current demand value I_p-reqAdjusting the duty cycle of the full-bridge rectifier circuit 220; in this embodiment, the control parameters of the primary side are maintained, and only the control parameters of the secondary side are adjusted to change the actual value I of the output current of the system_out-facThe output control of the wireless charging control system is simplified.

Step S42a, detecting the actual system output current value I corresponding to the adjusted duty ratio of the full-bridge rectification circuit 220_out-facAnd judging whether the current is equal to the current system output current demand value I_out-req(ii) a In this embodiment, the actual value I of the system output current in the current state is redetected_out-facBy adjusting the adjusted current actual system output current value I_out-facAND system output current demand value I_out-reqAnd comparing to know whether the current invalid charging system meets the charging requirement. It will be appreciated that the present system outputs an actual value of the current I_out-facAND system output current demand value I_out-reqThe size comparison can be performed according to difference or quotient comparison, and the foregoing form can be referred to specifically, which is not described herein again.

Step S43a, if yes, keeping the full-bridge rectifier circuit 220 powered by duty ratio;

step S44a, if not, continuously adjusting the duty ratio of the full-bridge rectification circuit 220 until the actual value I of the system output current_out-facEqual to the current system output current demand value I_out-req(ii) a When the actual value I of the system output current corresponding to the duty ratio of the full-bridge rectification circuit 220 is adjusted_out-facIs still not equal to the system output current demand value I_out-reqWhen the system is used, the duty ratio of the full-bridge rectification circuit 220 can be adjusted again, and the duty ratio of the full-bridge rectification circuit 220 can reach a threshold value due to the fact that the duty ratio of the full-bridge rectification circuit 220 is adjusted for the second time, namely the actual value of the output current of the system can not be adjusted on the secondary side, so that the numerical value of the duty ratio of the full-bridge rectification circuit 220 is judged, and the efficiency and the accuracy of system adjustment are guaranteed. At this time, the duty ratio of the full-bridge rectification circuit 220 is adjusted for the second time, and the duty ratio of the full-bridge rectification circuit 220 may reach a threshold value, that is, the actual value of the system output current may not be adjusted at the secondary side, so that the numerical value of the duty ratio of the full-bridge rectification circuit 220 is judged, and the efficiency and the accuracy of system adjustment are ensured.

In this embodiment, the actual current value I is output only by the duty cycle control system of the full-bridge rectifier circuit 220_out-facFurther make the system output the actual value of the current I_out-facAND system output current demand value I_out-reqAnd the wireless charging system can meet the charging requirement. If the duty ratio of the full-bridge rectification circuit 220 is continuously adjusted, whether the duty ratio of the full-bridge rectification circuit 220 reaches a threshold value can be judged, and the efficiency and the accuracy of system adjustment are ensured.

Referring to fig. 11, in some embodiments of the present invention, the system is controlled to output the actual current value I according to the determination result_out-facFurther comprising the steps of:

step S41b, if not, the duty ratio of the full-bridge rectifier circuit 220 is adjusted, and the target current demand value I required to be reached by the primary coil L p is adjusted_p-req(ii) a In this embodiment, the control parameters of the primary side and the secondary side are adjusted simultaneously to change the actual value I of the output current of the system_out-facImprove and increaseTo the actual value I of the system output current_out-facThe efficiency of the adjustment of (a).

Step S42b, detecting the current system output current actual value I_out-facAnd judging whether the current is equal to the current system output current demand value I_out-req；

Step S43b, if yes, keeping the power supply of the full-bridge rectifier circuit 220 duty cycle and the state of the infrastructure side 10;

step S44b, if not, continuing to adjust the duty cycle of the full-bridge rectifier circuit 220 and adjust the target current demand value I that the primary coil L p needs to reach_p-reqUntil the actual value of the system output current I_out-facEqual to the current system output current demand value I_out-req. In this embodiment, the control parameters of the primary side and the secondary side are adjusted simultaneously to change the actual value I of the output current of the system_out-facImproving the actual value I of the output current of the system_out-facThe adjustment efficiency of the primary side control parameter and the secondary side adjustment means are referred to above, and are not described herein again.

In this embodiment, the control parameters of the primary side and the secondary side are adjusted simultaneously to change the actual value I of the output current of the system_out-facImproving the actual value I of the output current of the system_out-facThe adjustment efficiency of (2) improves the matching rate of the wireless charging control system and the vehicle.

In some embodiments of the invention, the target current demand value I that the primary coil L p needs to reach is obtained_p-reqBefore the step (2) further comprising:

step S101, initializing a system state according to a charging request issued by the vehicle controller 300; in this embodiment, it may be confirmed that the user has a charging requirement according to the charging request issued by the vehicle controller 300, and the charging request issued by the vehicle controller 300 may be an electric signal or other control signal. The system state may be a state of the primary side and the secondary side, and a positional offset, and the like.

Step S102, determining the initial value of the duty ratio of the full-bridge rectification circuit 220 and the initial purpose of the primary coil L p according to the system stateTarget current demand value I_p-reqIn the embodiment, the maximum value and the minimum value of the duty ratio of the full-bridge rectification circuit 220 can be calculated after the duty ratio of the full-bridge rectification circuit 220 is initialized, so that the value interval of the duty ratio of the full-bridge rectification circuit 220 can be judged, and the subsequent control is facilitated_p-reqThe initial assignment can be performed after the estimation by experts, and the specific parameters of the assignment can be preset by an assignment table, so that different system states correspond to different initial target current demand values I of the primary coil L p_p-req。

Step S103, the vehicle-mounted controller sets the initial target current demand value I of the primary coil L p_p-reqSending; specifically, the wireless communication circuit can be used for sending, and the wireless communication circuit can also be used for receiving and sending signals such as a WIFI module, a radio frequency module and a Bluetooth module.

The target current demand value I required to be achieved by the primary side coil L p is obtained_p-reqAfter and as described above, determining the actual value of current I that the primary coil L p has reached_p-facWhether the target current demand value I is reached_p-reqBefore the step (2) further comprising:

step S201, transmitting a start charging request according to a charging request transmitted from the vehicle controller 300; in this embodiment, it is possible to confirm that the user has a charging demand according to the charging request sent by the vehicle controller 300, and thus, a charging start request is sent to the infrastructure side 10, and the infrastructure side 10 is started, so that the infrastructure side 10 charges the vehicle-mounted side 20. The start charging request may be an electrical signal or other control signal, as long as control is facilitated.

Step S202, initializing the voltage control parameter of the internal control circuit 100 and the phase shift angle of the inverter 120 according to the start charging request; specifically, the PFC circuit 110 may be controlled to be slowly started to a minimum duty ratio and to be soft-started. The soft start and the soft start can reduce the instantaneous load on the primary input voltage 150, reduce the instantaneous large current impact on the PFC circuit 110, and improve the stability of the wireless charging system.

In step S203, the initial voltage control parameter of the internal circuit and the initial phase shift angle of the inverter 120 are both set to minimum values. The initial voltage control parameter of the internal circuit and the initial phase-shifting angle of the inverter circuit are set to be the minimum value, so that the value of the target current required value is in the matching range which is more beneficial to the actual current value of the infrastructure side 10, and the matching efficiency of the target current required value and the actual current value is improved.

In order to achieve the above object, the present invention further provides a wireless charging system, which includes a memory, a processor, and a wireless charging control program stored in the memory and executable on the processor, wherein the processor implements the steps of the wireless charging control method according to any one of the above aspects when executing the wireless charging control program.

To achieve the above object, the present invention further provides a storage medium having a wireless charging control program stored thereon, wherein the wireless charging control program, when executed by a processor, implements the steps of the wireless charging control method according to any one of the above aspects.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.

The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. The wireless charging control method is applied to a wireless charging control system, the wireless charging control system comprises a infrastructure side and a vehicle side, the infrastructure side is provided with an internal control circuit and a primary side coil, the internal control circuit comprises a PFC circuit, a BUCK circuit and an inverter circuit, the vehicle side is provided with a secondary side coil and a full-bridge rectification circuit, and the wireless charging control method comprises the following steps:

2. The wireless charging control method according to claim 1, wherein the system output current actual value I is controlled according to the judgment result_out-facComprises the following steps:

if so,keeping the state of the primary side and keeping the actual current value I of the primary coil_p-facSupplying power;

3. The wireless charge control method according to claim 1, wherein the target current demand value I obtained in accordance with the target current demand value is_p-reqAdjusting the actual value of the output current I of the primary coil_p-facComprises the following steps:

4. The wireless charge control method according to claim 3, wherein the target current demand value I obtained in accordance with the target current demand value is_p-reqAdjusting the actual value of the output current I of the primary coil_p-facComprises the following steps:

5. The wireless charging control method of claim 4, wherein the step of adjusting the voltage of the internal control circuit and/or the phase shift angle of the inverter is followed by further comprising:

detecting adjusted internal control circuitsActual current value I of the primary winding at present corresponding to the phase shift angle of the voltage and/or inverter_p-fac；

adjusting the duty ratio of the BUCK circuit; and/or

And adjusting the duty ratio of the PFC circuit.

6. The wireless charging control method according to claim 5, wherein the determination of the current actual value I of the current primary coil is performed_p-facCorresponding actual value I of system output current_out-facIs equal to the system output current demand value I_out-reqFurther comprising after the step of:

detecting the actual value I of the system output current corresponding to the adjusted full-bridge rectification circuit duty ratio_out-facAnd determining whether or not equal toOutput current demand value I of current system_out-req；

7. The wireless charging control method according to claim 6, wherein the detection of the actual system output current value I corresponding to the adjusted full-bridge rectification circuit duty ratio_out-facAnd judging whether the current is equal to the current system output current demand value I_out-reqFurther comprising after the step of:

if yes, stopping charging or low-power output charging;

8. The wireless charging control method according to claim 1, wherein the system output current actual value I is controlled according to the judgment result_out-facFurther comprising the steps of:

detecting the actual value I of the system output current corresponding to the adjusted full-bridge rectification circuit duty ratio_out-facAnd judging whether it is equal toFront system output current demand value I_out-req；

if not, continuously adjusting the duty ratio of the full-bridge rectification circuit and adjusting the target current demand value I required by the primary coil_p-reqUntil the actual value of the system output current I_out-facEqual to the current system output current demand value I_out-req。

9. The wireless charge control method according to any one of claims 1 to 8, wherein the target current demand value I that the primary coil needs to reach is obtained_p-reqBefore the step (2) further comprising:

10. A wireless charging system, comprising a memory, a processor and a wireless charging control program stored in the memory and executable on the processor, wherein the processor implements the steps of the wireless charging control method according to any one of claims 1 to 9 when executing the wireless charging control program.

11. A storage medium having a wireless charging control program stored thereon, the wireless charging control program, when executed by a processor, implementing the steps of the wireless charging control method according to any one of claims 1 to 9.