A control method, device, medium, equipment and circuit for inductive power transmission

Abstract

The embodiment of the present application discloses a kind of control methods of inductive power transmission, by according to the output voltage V o And output current I o Of secondary side circuit output end, determine the duty cycle D of switch capacitor SCC;In primary side circuit end, control soft switch ZVS angle θ ZA It is the condition that constant is determined, according to the relationship of ZVS angle θ ZA , the duty cycle D of SCC and input impedance angle θ AB , determine the phase shift angle of full-bridge converter according to the corresponding relationship of phase shift angle and the output voltage V o Of secondary side circuit output end, control output voltage V o To realize ZVS soft switch and closed-loop control, with in the case of no communication link, the system stability and efficiency of charging process have been improved, realized with simple phase shift control the advantages such as double-side full-soft switch.

Description

Technical Field

[0001] This invention relates to the field of wireless power transmission technology, specifically to a control method, apparatus, medium, device, and circuit for inductive power transmission. Background Technology

[0002] Inductive power transfer technology has received considerable attention in fields such as implantable devices and electric vehicles. In most cases, the load of an inductive power transfer system is a lithium-ion battery. Accurate control of the charging voltage and charging current is crucial for the battery's lifespan, cycle time, and safe operation. Its charging phase typically includes two operating modes: constant current mode when the state of charge is low, and constant voltage mode when the state of charge is high.

[0003] For an inductive power transmission system, since there is no physical connection between the transmitter and output, a communication module is needed to transmit the sampled voltage or current information of the load to the transmitter, enabling the system to precisely control the voltage or current. Because the communication link is affected by hardware parameters during information transmission, accuracy is a crucial technical indicator, thus increasing the design cost of the communication module. Furthermore, the presence of the communication link introduces a certain delay, affecting data transmission; and when wireless communication fails, it reduces system stability. Summary of the Invention

[0004] This invention provides a control method, device, medium, and equipment for inductive power transmission, which can adjust the voltage and current of the load without a communication link, solving the problems of complex structure and poor stability in current inductive power transmission systems when the wireless communication link is eliminated.

[0005] In a first aspect, embodiments of the present invention provide a control method for inductive power transmission, based on an inductive power transmission circuit, the method comprising:

[0006] Based on the output voltage V at the output terminal of the secondary circuit o and output current I o Determine the duty cycle D of the switched capacitor SCC;

[0007] At the primary circuit terminal, control the soft switching ZVS angle θ. ZA Under the condition of being a constant value, according to the ZVS angle θ ZA The duty cycle D of SCC and the input impedance angle θ AB The relationship determines the phase shift angle of the full-bridge converter.

[0008] According to the phase shift angle The output voltage V at the output terminal of the secondary circuit o The corresponding relationship controls the output voltage V.o This enables ZVS soft switching and closed-loop control.

[0009] Optionally, the step of adjusting the output voltage V at the output terminal of the secondary circuit... o and output current I o Determine the duty cycle D of the switched capacitor SCC, including:

[0010] Collect the output voltage V at the output terminal of the secondary circuit o and output current I o To determine whether the secondary circuit is in constant voltage output mode or constant current output mode;

[0011] When the secondary circuit is in constant voltage output mode, the rated voltage reference value V will be... ref With output voltage V o Input the secondary controller PI to output the duty cycle D of SCC; or,

[0012] When the secondary circuit is in constant current output mode, the rated current reference value I will be used. ref With output current I o The difference, multiplied by the compensation coefficient k, is input to the secondary controller PI to output the duty cycle D of SCC, where k = V. ref / I ref .

[0013] Optionally, at the primary circuit end, the soft-switching ZVS angle θ is controlled. ZA Under the condition of being a constant value, according to the ZVS angle θ ZA The duty cycle D of SCC and the input impedance angle θ AB The relationship determines the phase shift angle of the full-bridge converter. include:

[0014] Based on the SCC duty cycle D and θ AB The functional relationship between them determines the input impedance angle θ. AB The calculation formula is:

[0015]

[0016] Wherein, capacitor C a and capacitor C b These are the equivalent capacitances of SCC; To satisfy C under ZPA conditions s The impedance value is expressed as ω is the angular frequency of the inductive power transmission circuit.

[0017] L s For the self-inductance of the secondary coil; C s C is the capacitance value of the secondary-side compensation capacitor. fFor secondary resonant capacitor; L f For secondary resonant inductance; R eq For the equivalent load, R eq =0.8R L , where R L For load;

[0018] C s C is the capacitance value of the secondary-side compensation capacitor. f For secondary resonant capacitor; L f For secondary resonant inductance; R eq For the equivalent load, R eq =0.8R L , where R L For load;

[0019] At the primary-side circuit terminal, the soft-switching ZVS angle θ is detected by the primary-side controller. ZA To control the ZVS angle θ ZA It is a constant;

[0020] Determine the phase shift angle of the full-bridge converter based on the formula for the phase angle function. The formula for the phase angle function relationship is as follows:

[0021] Optionally, the step based on the phase shift angle The output voltage V at the output terminal of the secondary circuit o The correspondence formulas include:

[0022]

[0023] Among them, v in The inverter output voltage V AB The fundamental voltage, L f M is the secondary resonant inductance, and M is the mutual inductance.

[0024] Optionally, the step is based on the SCC duty cycle D and θ. AB The functional relationship between them determines the input impedance angle θ. AB The calculation formula includes:

[0025] The secondary compensation capacitor C is changed by controlling the duty cycle D of SCC. s The size of C is determined to achieve minimum reactive current control while satisfying ZVS, within the switching cycle. S The formula for the equivalent capacitance value is:

[0026]

[0027] According to C s The equivalent capacitance formula (4) and the input impedance angle expression are used to determine the SCC duty cycle D and θ.AB The functional relationship between them, where the input impedance angle expression θ AB for:

[0028]

[0029] Among them, C s * To satisfy C under ZPA conditions s The capacitance value, ω is the angular frequency of the induced electrical energy transmission circuit.

[0030] In a second aspect, embodiments of the present invention provide a control device for inductive power transmission, based on an inductive power transmission circuit, the device comprising:

[0031] The duty cycle determination module is used to determine the duty cycle based on the output voltage V at the output terminal of the secondary circuit. o and output current I o Determine the duty cycle D of the switched capacitor SCC;

[0032] The phase shift angle determination module is used to control the soft-switching ZVS angle θ at the primary circuit end. ZA Under the condition of being a constant value, according to the ZVS angle θ ZA The duty cycle D of SCC and the input impedance angle θ AB The relationship determines the phase shift angle of the full-bridge converter.

[0033] The voltage control module is used to control the voltage based on the phase shift angle. The output voltage V at the output terminal of the secondary circuit o The corresponding relationship controls the output voltage V. o This enables ZVS soft switching and closed-loop control.

[0034] Optionally, the duty cycle determination module is specifically used for:

[0035] Collect the output voltage V at the output terminal of the secondary circuit o and output current I o To determine whether the secondary circuit is in constant voltage output mode or constant current output mode;

[0036] When the secondary circuit is in constant voltage output mode, the rated voltage reference value V will be... ref With output voltage V o Input the secondary controller PI to output the duty cycle D of SCC; or,

[0037] When the secondary circuit is in constant current output mode, the rated current reference value I will be used. ref With output current I oThe difference, multiplied by the compensation coefficient k, is input to the secondary controller PI to output the duty cycle D of SCC, where k = V. ref / I ref .

[0038] Optionally, the phase shift angle determination module is specifically used for:

[0039] Based on the SCC duty cycle D and θ AB The functional relationship between them determines the input impedance angle θ. AB The calculation formula is:

[0040]

[0041] Wherein, capacitor C a and capacitor C b These are the equivalent capacitances of SCC; To satisfy C under ZPA conditions s The impedance value is expressed as ω is the angular frequency of the inductive power transmission circuit.

[0042] L s For the self-inductance of the secondary coil; C s C is the capacitance value of the secondary-side compensation capacitor. f For secondary resonant capacitor; L f For secondary resonant inductance; R eq For the equivalent load, R eq =0.8R L , where R L For load;

[0043] C s C is the capacitance value of the secondary-side compensation capacitor. f For secondary resonant capacitor; L f For secondary resonant inductance; R eq For the equivalent load, R eq =0.8R L , where R L For load;

[0044] At the primary-side circuit terminal, the soft-switching ZVS angle θ is detected by the primary-side controller. ZA To control the ZVS angle θ ZA It is a constant;

[0045] Determine the phase shift angle of the full-bridge converter based on the formula for the phase angle function. The formula for the phase angle function relationship is as follows:

[0046] Optionally, the voltage control module determines the voltage based on the phase shift angle. The output voltage V at the output terminal of the secondary circuito The corresponding formulas include:

[0047]

[0048] Among them, v in The inverter output voltage V AB The fundamental voltage, L f M is the secondary resonant inductance, and M is the mutual inductance.

[0049] Optionally, the phase shift angle determination module determines the phase shift angle based on the SCC duty cycle D and θ. AB The functional relationship between them determines the input impedance angle θ. AB The calculation formula includes:

[0050] The secondary compensation capacitor C is changed by controlling the duty cycle D of SCC. s The size of C is determined to achieve minimum reactive current control while satisfying ZVS, within the switching cycle. S The formula for the equivalent capacitance value is:

[0051]

[0052] According to C s The equivalent capacitance formula (4) and the input impedance angle expression are used to determine the SCC duty cycle D and θ. AB The functional relationship between them, where the input impedance angle expression θ AB for:

[0053]

[0054] Among them, C s * To satisfy C under ZPA conditions s The capacitance value, ω is the angular frequency of the induced electrical energy transmission circuit.

[0055] Thirdly, embodiments of the present invention provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the control method for inductive power transmission as described above.

[0056] Fourthly, embodiments of the present invention provide a device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the control method for inductive power transmission as described above.

[0057] Fifthly, embodiments of the present invention provide an inductive power transmission circuit, including a transmitting module and a receiving module, characterized in that: the transmitting module includes a voltage-fed inverter, a primary-side compensation network, and a primary-side coil; the receiving module includes a secondary-side coil, a secondary-side compensation network, and a full-bridge rectifier circuit;

[0058] The voltage-fed inverter includes: a DC voltage source V in The first power switch S1, the second power switch S2, the third power switch S3, and the fourth power switch S4 are used to invert the DC voltage provided by the DC voltage source into a high-frequency AC voltage.

[0059] The primary-side compensation network includes: a primary-side resonant capacitor C. p It is used to compensate for excess reactance in the primary and secondary side impedances, and to compensate the output impedance of the voltage-fed inverter to be purely resistive.

[0060] The secondary-side compensation network includes: a secondary-side compensation capacitor C. s Secondary resonant capacitor C f And the secondary resonant inductor Lf, used to compensate for excess reactance in the primary and secondary coil impedances, thus compensating the input impedance of the receiving module to be purely resistive; wherein, the secondary compensation capacitor C s Includes: the fifth power switch S5, capacitor C a and capacitor C b And D5 is C s Anti-parallel diodes;

[0061] The full-bridge rectifier circuit includes: a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, and a filter capacitor C. o It is used to convert the AC power received on the secondary side into DC power.

[0062] This invention embodiment uses the output voltage V at the output terminal of the secondary circuit. o and output current I o Determine the duty cycle D of the switched capacitor SCC; control the soft-switching ZVS angle θ at the primary circuit terminals. ZA Under the condition of being a constant value, according to the ZVS angle θ ZA The duty cycle D of SCC and the input impedance angle θ AB The relationship determines the phase shift angle of the full-bridge converter. According to the phase shift angle The output voltage V at the output terminal of the secondary circuit o The corresponding relationship controls the output voltage V. oTo achieve ZVS soft switching and closed-loop control, compared with traditional inductive power transmission systems, it has the advantages of improving system stability and efficiency in the charging process without communication links, and realizing dual-sided full soft switching with simple phase shift control. It is suitable for wireless charging systems for electric vehicles and other fields. Attached Figure Description

[0063] Figure 1 This is a flowchart of a control method for inductive power transmission provided in Embodiment 1 of the present invention;

[0064] Figure 2A This is a circuit topology diagram of an inductive power transmission control provided in Embodiment 1 of the present invention;

[0065] Figure 2B This is a schematic diagram of the control of the secondary side of the inductive power transmission circuit topology provided in Embodiment 1 of the present invention;

[0066] Figure 2C This is a schematic diagram of the control of the primary side of the inductive power transmission circuit topology provided in Embodiment 1 of the present invention;

[0067] Figure 3 This is a schematic diagram of the phase difference detection circuit provided in Embodiment 1 of the present invention;

[0068] Figure 4 This is a system control schematic diagram of a circuit topology for inductive power transmission control provided in Embodiment 1 of the present invention;

[0069] Figure 5 This is a schematic diagram of the control information flow of a circuit topology provided in Embodiment 1 of the present invention;

[0070] Figure 6 This is a schematic diagram of the structure of a control device for inductive power transmission provided in Embodiment 2 of the present invention;

[0071] Figure 7 This is a schematic diagram of the structure of a device provided in Embodiment 4 of the present invention;

[0072] Figure 8 This is a circuit topology diagram of an inductive power transmission without communication links provided in Embodiment 5 of the present invention;

[0073] Figure 9 Simulation waveform diagram of 2.5A constant current control with a 40Ω load according to an embodiment of the present invention;

[0074] Figure 10 The simulation waveform diagram is for a 2.5A constant current control with a load of 34Ω according to an embodiment of the present invention. Detailed Implementation

[0075] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0076] Before discussing the exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although the flowcharts describe the steps as sequential processes, many of these steps can be performed in parallel, concurrently, or simultaneously. Furthermore, the order of the steps can be rearranged. The process can be terminated when its operation is complete, but may also have additional steps not included in the figures. The process can correspond to a method, function, procedure, subroutine, subroutine, etc.

[0077] First, the implementation of this solution can be based on the following premise:

[0078] The network module distinguishes between the server and the client.

[0079] The application is divided into server and client. However, unlike most applications that need to distinguish between server and client, this product does not want to set up a separate computer as a server due to considerations such as cost control, program startup freedom, and convenience.

[0080] Therefore, after the program starts, it first uses the network module to parse the information recorded in the configuration file in advance to determine whether it is a server. If it is a server, then it is both a server and a client, and other computers are clients.

[0081] Determine the network transmission communication protocol.

[0082] Based on the network environment in which this program operates, UDP was chosen as the underlying network transmission protocol. However, considering that UDP is an unreliable protocol, prone to packet loss and lack of order assurance, a UDP+KCP scheme was selected to achieve reliable UDP transmission. Furthermore, TCP was used as the network transmission protocol during the user login preparation phase to ensure the reliability of user login.

[0083] Specify the parameter settings in the synchronization logic.

[0084] The parameters required in the synchronization logic are specified so that these pre-set parameters can be conveniently used in the implementation of the synchronization algorithm. Specifically, these parameters include: server IP address, server network port, local client IP address, server frame interval, heartbeat packet frame interval, server time to determine client timeout / disconnection, client time to determine server timeout / disconnection, and client frame rate multiplier.

[0085] Define the synchronous message data protocol.

[0086] First, message types need to be defined, including: synchronization preparation, synchronization start, tracking data, synchronization exit, heartbeat, and custom messages. Then, message data needs to be defined, including: message type, player ID of the message source, player ID of the message target, tracking data, Ping timestamp, and custom messages. Finally, the uplink protocol for data sent from the client to the server and the downlink protocol for data sent from the server to the client need to be defined. The uplink protocol includes: session ID and message list; the downlink protocol includes: frame ID and message list.

[0087] Example 1

[0088] Figure 1 The flowchart of a control method for inductive power transmission provided in Embodiment 1 of the present invention can be executed by the control device for inductive power transmission provided in the embodiment of the present invention, which can be implemented in software and / or hardware. Figure 2A This is a circuit topology diagram for inductive power transfer control provided in Embodiment 1 of the present invention. The method specifically includes:

[0089] S110, Based on the output voltage V at the output terminal of the secondary circuit o and output current I o Determine the duty cycle D of the switched capacitor SCC.

[0090] S120. At the primary circuit terminal, control the soft switch ZVS angle θ. ZA Under the condition of being a constant value, according to the ZVS angle θ ZA The duty cycle D of SCC and the input impedance angle θ AB The relationship determines the phase shift angle of the full-bridge converter.

[0091] S130, Based on the phase shift angle The output voltage V at the output terminal of the secondary circuit o The corresponding relationship controls the output voltage V. o This enables ZVS soft switching and closed-loop control.

[0092] like Figure 2A As shown in the figure, the switched capacitor SCC is the circuit shown in the dashed box.

[0093] In this embodiment of the invention, the output voltage V at the output terminal of the secondary circuit is... o and output current I o Determining the duty cycle D of the switched capacitor SCC includes: acquiring the output voltage V at the output terminal of the secondary circuit. o and output current Io To determine whether the secondary circuit is in constant voltage output mode or constant current output mode; when the secondary circuit is in constant voltage output mode, the rated voltage reference value V is set. ref With output voltage V o Input the secondary-side controller PI to output the duty cycle D of SCC; or, when the secondary-side circuit is in constant current output mode, input the rated current reference value I. ref With output current I o The difference, multiplied by the compensation coefficient k, is input to the secondary controller PI to output the duty cycle D of SCC, where k = V. ref / I ref .

[0094] like Figure 2B As shown, Figure 2B This is a schematic diagram of the control of the secondary side of the inductive power transmission circuit topology according to Embodiment 1 of the present invention.

[0095] Specifically, in this embodiment, on the secondary side, the secondary side controller (i.e. Figure 2A The “controller 2” shown, and Figure 2B The "PI controller 2" shown collects real-time charging information V. o and I o Simultaneously, it determines whether the system is in constant current or constant voltage output mode. Based on V ref and I ref These are the rated charging voltage in constant voltage charging mode and the rated charging current in constant current charging mode, respectively. o <V ref When V is in constant current charging mode, it means the system is operating in constant current charging mode. o Increase to more than V ref When the voltage is high, the system will enter constant voltage charging mode.

[0096] In constant voltage charging mode, V o The information is sent to PI controller 2, and PI controller 2 receives V o and its reference value V ref The control quantity D of the fifth power switch S5 in the output SCC is calculated. During the constant current charging stage, the output current I is collected. o It was sent to the controller. o and its reference value I ref The difference is multiplied by a compensation coefficient k, k = V ref / I ref The result is input into PI controller 2, which in turn outputs the control quantity D for SCC. The equivalent capacitance value of SCC changes with the change of D, and the equivalent capacitance value of SCC can be changed by controlling D.

[0097] In this embodiment of the invention, the soft-switching ZVS angle θ is controlled at the primary side circuit terminal. ZA Under the condition of being a constant value, according to the ZVS angle θ ZA The duty cycle D of SCC and the input impedance angle θ AB The relationship determines the phase shift angle of the full-bridge converter. include:

[0098] Based on the SCC duty cycle D and θ AB The functional relationship between them determines the input impedance angle θ. AB The calculation formula is:

[0099]

[0100] Wherein, capacitor C a and capacitor C b These are the equivalent capacitances of SCC; To satisfy C under ZPA conditions s The impedance value, ω is the angular frequency of the inductive power transmission circuit.

[0101] L s For the self-inductance of the secondary coil, C s C is the capacitance value of the secondary-side compensation capacitor. f For secondary resonant capacitor; L f For secondary resonant inductance; R eq For the equivalent load, R eq =0.8R L , where R L For load;

[0102] At the primary-side circuit terminal, the soft-switching ZVS angle θ is detected by the primary-side controller. ZA To control the ZVS angle θ ZA The phase shift angle of the full-bridge converter is determined based on the formula for the phase angle function relationship, where the phase shift angle is a constant. The formula for the phase angle function relationship is as follows:

[0103] like Figure 2C As shown, Figure 2C This is a schematic diagram of the control of the primary side of the inductive power transmission circuit topology according to Embodiment 1 of the present invention.

[0104] Specifically, in this embodiment, based on the duty cycle D and θ in SCC AB The relationship can reflect the change in D to the input impedance angle θ on the primary side. AB The change. As long as the input impedance angle θ is detected in real time on the primary side. AB Changes in the switching capacitor on the secondary side can be reflected in the primary circuit.

[0105] SCC is used to control the input impedance angle θ. AB Combining the input impedance angle expression and C S The equivalent capacitance value can be used to obtain the duty cycle D and θ in SCC. AB The formula for calculating the relationship is:

[0106]

[0107] But θ AB It is not easy to measure, so by detecting θ ZA To indirectly detect θ AB , where θ ZA For v AB rising edge and i AB Phase difference at zero point.

[0108] Specifically, on the primary side, the input voltage V AB and input i AB The data is collected and detected in real time, and then sent to the hardware phase detection circuit to measure the ZVS angle θ. ZA It is detected in real time. θ ZA and its reference θ ref The value is input to the primary-side controller in real time (i.e.) Figure 2A The “Controller 1” shown, and Figure 2C The "PI controller 1" shown in the diagram outputs the phase shift angle applied to the full-bridge converter.

[0109] like Figure 3 As shown, Figure 3 This is a schematic diagram of the phase difference detection circuit according to Embodiment 1 of the present invention.

[0110] Specifically, the working principle of the hardware phase detection circuit in this embodiment is as follows: v AB and i AB The signal is sent to the zero-crossing comparator chip, and the output voltage after zero-crossing comparison is a square wave v. o1 and v o2 v o1 and v o2 Input XOR gate chip, when v o1 and v o2 When the values ​​are either all high or all low, the logic output is high, and the output is v. ph Finally, after low-pass filtering, the DC quantity v is obtained. ph_dc Input to PI controller 1.

[0111] Specifically, in this embodiment, when the output changes, the reactive current of the secondary controller is controlled by adjusting the workload of the SCC. Due to topology characteristics, θ ABChanges with the SCC equivalent capacitance value, and the original side changes by θ AB Reflects the change in output voltage / current.

[0112] On the primary side in this embodiment, θ ZA Is controlled to a very small fixed constant value to achieve ZVS soft switching. The primary side phase shift angle And θ AB Have a linear correlation:

[0113]

[0114] Specifically, in this embodiment, according to the output voltage V o And the output voltage v of the full-bridge inversion of the primary power supply AB Relationship and the output voltage v AB And the relationship with the fundamental component V of the output voltage ABf [[ID=2�]]The relationship between the output voltage V o And the phase shift angle Is as follows:

[0115]

[0116] In the formula, v in Is the fundamental voltage of the inverter output voltage V AB L f Is the secondary resonant inductor, and M is the mutual inductance.

[0117] Therefore, the output voltage V o Can be directly controlled by the phase shift angle The path of the information flow is: from the change in the output voltage change V err To the change in the SCC duty cycle; θ AB Will also change synchronously.

[0118] At the same time, as long as θ ZA Is controlled to a constant value, the changing θ AB Will be converted into the change of the phase shift angle Therefore, the secondary controller can adjust the output voltage and current through the phase shift control of the primary side. And in this process, no communication link is required to participate.

[0119] In the inventive embodiment, the calculation formula for determining the input impedance angle θ AB According to the functional relationship between the SCC duty cycle D and θ AB Includes: changing the size of the secondary compensation capacitor C s By controlling the duty cycle D of the SCC, achieving minimum reactive current control under the condition of meeting ZVS, and the equivalent capacitance value formula of C S In the switching period is;

[0120]

[0121] According to C S The equivalent capacitance formula (4) and the input impedance angle expression are used to determine the SCC duty cycle D and θ. AB The functional relationship between them, where the input impedance angle expression θ AB for:

[0122]

[0123] Among them, C s * To satisfy C under ZPA conditions s The capacitance value, ω is the angular frequency of the induced electrical energy transmission circuit.

[0124] Specifically, in this embodiment, the input impedance angle affects C throughout the full power range. s It has good responsiveness, and C s The magnitude of C has little effect on the output voltage; it can be controlled by adjusting C. s The reactive power of the system can be adjusted by the magnitude of the reactive power, and C can be obtained within the switching cycle. S The equivalent capacitance value. And when C s impedance X Cs Not in zero phase angle (ZPA) state, at input voltage and input current There will be a phase difference, that is, the input impedance angle θ can be obtained according to the input impedance angle expression (5). AB .

[0125] Figure 4 This is a system control schematic diagram of a circuit topology for inductive power transmission control provided in Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the control information flow of a circuit topology provided in Embodiment 1 of the present invention.

[0126] Specifically, in this embodiment, on the secondary side, the input of the PI controller 2 is the output voltage V. o and its reference value V ref The difference V err The output of PI controller 2 is the duty cycle D of the fifth power switch in SCC. The secondary-side control changes the reactive power of the system by altering the equivalent capacitance of SCC. On the primary side, the input voltage V... AB and input i AB Real-time acquisition, ZVS angle θ ZA It is detected in real time. θ ZA and its reference θ ref The difference θ erThe input r is to PI controller 1, and the output of PI controller 1 is the phase shift angle acting on the full-bridge converter. The purpose of primary-side control is to control θ ZA It is a constant.

[0127] Specifically, in this embodiment, the output of PI controller 1 is the input of PWM1 generator, the output of PI controller 2 is the input of PWM2 generator, and the output of PWM1 generator and PWM2 generator are control signals for the power switching transistors.

[0128] The information flow path in this embodiment is as follows: change in output voltage / current → change in SCC duty cycle D → change in SCC equivalent capacitance → change in input impedance angle → change in phase shift angle. The phase shift angle is the final control target. By controlling the phase shift angle, the voltage / current of the load can be controlled.

[0129] This embodiment does not require the participation of wireless communication between the primary and secondary sides. It adopts phase-shift control and switched capacitor (SCC) modulation to simultaneously adjust the output voltage / current and reactive current at a fixed frequency, thereby achieving constant current and constant voltage charging of the battery and satisfying closed-loop control and soft switching (ZVS) control of the output voltage.

[0130] This invention embodiment uses the output voltage V at the output terminal of the secondary circuit. o and output current I o Determine the duty cycle D of the switched capacitor SCC; control the soft-switching ZVS angle θ at the primary circuit terminals. ZA Under the condition of being a constant value, according to the ZVS angle θ ZA The duty cycle D of SCC and the input impedance angle θ AB The relationship determines the phase shift angle of the full-bridge converter. According to the phase shift angle The output voltage V at the output terminal of the secondary circuit o The corresponding relationship controls the output voltage V. o To achieve ZVS soft switching and closed-loop control, compared with traditional inductive power transmission systems, it has the advantages of improving system stability and efficiency in the charging process without communication links, and realizing dual-sided full soft switching with simple phase shift control. It is suitable for wireless charging systems for electric vehicles and other fields.

[0131] Example 2

[0132] Figure 6 This is a schematic diagram of the structure of a control device for inductive power transmission provided in an embodiment of the present invention. The device specifically includes:

[0133] Duty cycle determination module 610 is used to determine the duty cycle based on the output voltage V at the output terminal of the secondary circuit. oand output current I o Determine the duty cycle D of the switched capacitor SCC;

[0134] Phase shift angle determination module 620 is used to control the soft-switching ZVS angle θ at the primary circuit end. ZA Under the condition of being a constant value, according to the ZVS angle θ ZA The duty cycle D of SCC and the input impedance angle θ AB The relationship determines the phase shift angle of the full-bridge converter.

[0135] Voltage control module 630, used to control voltage based on phase shift angle The output voltage V at the output terminal of the secondary circuit o The corresponding relationship controls the output voltage V. o This enables ZVS soft switching and closed-loop control.

[0136] Optionally, the duty cycle determination module 610 is specifically used for:

[0137] Collect the output voltage V at the output terminal of the secondary circuit o and output current I o To determine whether the secondary circuit is in constant voltage output mode or constant current output mode; when the secondary circuit is in constant voltage output mode, the rated voltage reference value V is set. ref With output voltage V o Input the secondary-side controller PI to output the duty cycle D of SCC; or, when the secondary-side circuit is in constant current output mode, input the rated current reference value I. ref With output current I o The difference, multiplied by the compensation coefficient k, is input to the secondary controller PI to output the duty cycle D of SCC, where k = V. ref / I ref .

[0138] Optionally, the phase angle determination module 620 is specifically used for:

[0139] Based on the SCC duty cycle D and θ AB The functional relationship between them determines the input impedance angle θ. AB The calculation formula is:

[0140]

[0141] Wherein, capacitor C a and capacitor C b These are the equivalent capacitances of SCC; To satisfy C under ZPA conditions s The impedance value, ω is the angular frequency of the inductive power transmission circuit.

[0142] L s For the self-inductance of the secondary coil, C s C is the capacitance value of the secondary-side compensation capacitor. f For secondary resonant capacitor; L f For secondary resonant inductance; R eq For the equivalent load, R eq =0.8R L , where R L For load;

[0143] At the primary-side circuit terminal, the soft-switching ZVS angle θ is detected by the primary-side controller. ZA To control the ZVS angle θ ZA It is a constant;

[0144] Determine the phase shift angle of the full-bridge converter based on the formula for the phase angle function. The formula for the phase angle function relationship is as follows:

[0145] Optionally, the voltage control module 630 adjusts the voltage according to the phase shift angle. The output voltage V at the output terminal of the secondary circuit o The correspondence formulas include:

[0146]

[0147] Among them, v in The inverter output voltage v AB The fundamental voltage, L f M is the secondary resonant inductance, and M is the mutual inductance.

[0148] Optionally, the phase shift angle determination module 620 determines the phase shift angle based on the SCC duty cycle D and θ. AB The functional relationship between them determines the input impedance angle θ. AB The calculation formula includes:

[0149] The secondary compensation capacitor C is changed by controlling the duty cycle D of SCC. s The size of C is determined to achieve minimum reactive current control while satisfying ZVS, within the switching cycle. S The formula for the equivalent capacitance value is:

[0150]

[0151] According to C S The equivalent capacitance formula (4) and the input impedance angle expression are used to determine the SCC duty cycle D and θ. AB The functional relationship between them, where the input impedance angle expression θ AB for:

[0152]

[0153] Among them, C s * To satisfy C under ZPA conditions s The capacitance value, ω is the angular frequency of the induced electrical energy transmission circuit.

[0154] Example 3

[0155] This application also provides a storage medium containing computer-executable instructions, which, when executed by a computer processor, are used to perform the following:

[0156] Based on the output voltage V at the output terminal of the secondary circuit o and output current I o Determine the duty cycle D of the switched capacitor SCC; control the soft-switching ZVS angle θ at the primary circuit terminals. ZA Under the condition of being a constant value, according to the ZVS angle θ ZA The duty cycle D of SCC and the input impedance angle θ AB The relationship determines the phase shift angle of the full-bridge converter. According to the phase shift angle The output voltage V at the output terminal of the secondary circuit o The corresponding relationship controls the output voltage V. o This enables ZVS soft switching and closed-loop control.

[0157] Storage medium—any type of memory device or storage device. The term "storage medium" is intended to include: mounting media, such as CD-ROM, floppy disk, or magnetic tape devices; computer system memory or random access memory, such as DRAM, DDR RAM, SRAM, EDO RAM, Rambus RAM, etc.; non-volatile memory, such as flash memory, magnetic media (e.g., hard disk or optical storage); registers or other similar types of memory elements, etc. Storage medium may also include other types of memory or combinations thereof. Furthermore, storage medium may reside in a computer system in which a program is executed, or it may reside in a different second computer system connected to the computer system via a network (such as the Internet). The second computer system can provide program instructions to the computer for execution. The term "storage medium" may include two or more storage media that may reside in different locations (e.g., in different computer systems connected via a network). Storage medium may store program instructions (e.g., specifically implemented as a computer program) that can be executed by one or more processors.

[0158] Of course, the computer-executable instructions provided in the embodiments of this application are not limited to the control operations of inductive power transmission as described above, but can also execute related operations in the control method of inductive power transmission provided in any embodiment of this application.

[0159] Example 4

[0160] This application provides an electronic device that can integrate the control device for inductive power transmission provided in this application. Figure 7 This is a schematic diagram of the structure of an electronic device provided in Embodiment 4 of this application. Figure 7 As shown, this embodiment provides an electronic device 700, which includes: one or more processors 720; and a storage device 710 for storing one or more programs, which, when executed by the one or more processors 720, cause the one or more processors 720 to perform:

[0161] Based on the output voltage V at the output terminal of the secondary circuit o and output current I o Determine the duty cycle D of the switched capacitor SCC; control the soft-switching ZVS angle θ at the primary circuit terminals. ZA Under the condition of being a constant value, according to the ZVS angle θ ZA The duty cycle D of SCC and the input impedance angle θ AB The relationship determines the phase shift angle of the full-bridge converter. According to the phase shift angle The output voltage V at the output terminal of the secondary circuit o The corresponding relationship controls the output voltage V. o This enables ZVS soft switching and closed-loop control.

[0162] like Figure 7 As shown, the electronic device 700 includes a processor 720, a storage device 710, an input device 730, and an output device 740; the number of processors 720 in the electronic device can be one or more. Figure 7 Taking a processor 720 as an example; the processor 720, storage device 710, input device 730, and output device 740 in the electronic device can be connected via a bus or other means. Figure 7 Taking the connection between China and Israel via bus 750 as an example.

[0163] The storage device 710, as a computer-readable storage medium, can be used to store software programs, computer-executable programs, and module units, such as the program instructions corresponding to the control method for inductive power transmission in the embodiments of this application.

[0164] Storage device 710 may primarily include a program storage area and a data storage area. The program storage area may store the operating system and at least one application program required for a given function; the data storage area may store data created based on terminal usage. Furthermore, storage device 710 may include high-speed random access memory and non-volatile memory, such as at least one disk storage device, flash memory, or other non-volatile solid-state storage device. In some instances, storage device 710 may further include memory remotely located relative to processor 720, and this remote memory may be connected via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0165] Input device 730 can be used to receive input digital, character, or voice information, and to generate key signal inputs related to user settings and function control of the electronic device. Output device 740 may include devices such as a display screen and a speaker.

[0166] Example 5

[0167] Figure 8 This is a circuit topology diagram of inductive power transmission without communication links provided in Embodiment 5 of the present invention.

[0168] like Figure 8 As shown, this embodiment of the invention provides an inductive power transmission circuit, including a transmitting module and a receiving module. The transmitting module includes a voltage-fed inverter, a primary-side compensation network, and a primary-side coil; the receiving module includes a secondary-side coil, a secondary-side compensation network, and a full-bridge rectifier circuit.

[0169] The voltage-fed inverter includes: a DC voltage source V in The first power switch S1, the second power switch S2, the third power switch S3, and the fourth power switch S4 are used to invert the DC voltage provided by the DC voltage source into a high-frequency AC voltage.

[0170] The primary-side compensation network includes: a primary-side resonant capacitor C. p It is used to compensate for excess reactance in the primary and secondary side impedances, and to compensate the output impedance of the voltage-fed inverter to be purely resistive.

[0171] The secondary-side compensation network includes: a secondary-side compensation capacitor C. s Secondary resonant capacitor C f And the secondary resonant inductor Lf, used to compensate for excess reactance in the primary and secondary coil impedances, thus compensating the input impedance of the receiving module to be purely resistive; wherein, the secondary compensation capacitor C s Includes: the fifth power switch S5, capacitor C a and capacitor Cb And D5 is C s Anti-parallel diodes;

[0172] The full-bridge rectifier circuit includes: a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, and a filter capacitor C. o It is used to convert the AC power received on the secondary side into DC power.

[0173] In this embodiment, the primary coil is used to transmit the energy output from the voltage-fed inverter to the secondary coil; the secondary coil is used to receive the energy emitted by the primary coil. The primary compensation network and the primary coil constitute the primary resonant cavity; the secondary compensation network and the secondary coil constitute the secondary resonant cavity.

[0174] In this embodiment, the power switch is a power MOSFET.

[0175] Specifically, the secondary-side compensation capacitor C s One end of R is connected to the secondary coil, where R s For the secondary coil L s The internal resistance, resonant capacitor C s The other end is connected to the secondary resonant inductor L f Connection; Secondary resonant capacitor C f One end (E) is connected to the secondary compensation capacitor C s and secondary resonant inductor L f Connection, resonant capacitor C f The other end (F) is connected to the first output point (D) of the full-bridge rectifier circuit and the secondary coil L. s Connection; Secondary resonant inductor L f One end is connected to the secondary compensation capacitor C s and resonant capacitor C f Connection, resonant inductor L f The other end is connected to the first input point (C) of the full-bridge rectifier circuit.

[0176] This invention proposes a circuit topology for inductive power transfer without communication links. Based on a control strategy combining switched capacitors in an S-LCC-compensated inductive power transfer system and phase-shift control at a fixed frequency, the wireless communication module is eliminated, achieving constant current and constant voltage charging, as well as zero-voltage switching. At the receiving end, the switched capacitor transmits information to the transmitting end by changing the phase angle of its input impedance; at the transmitting end, the inverter is regulated by phase-shift control to achieve constant voltage or constant current charging of the load.

[0177] Figure 9 The simulation waveform diagram is shown for the circuit provided according to the embodiment of the present invention under the condition of 2.5A constant current control and a load of 40Ω. Figure 10The simulation waveform diagram of the circuit provided according to the embodiment of the present invention under the conditions of 2.5A constant current control and a load of 34Ω.

[0178] Specifically, this embodiment uses a circuit topology based on switched capacitors for inductive power transmission to conduct a simulation experiment without a communication link, and obtains the following results: The simulation experiment was conducted without a wireless communication module, and a 250W prototype was built, which has an input voltage of 85V, an output current of 2.5A during constant current charging, and loads of 40Ω and 34Ω, respectively, and the simulation results data were obtained.

[0179] It is evident that the control strategy of the circuit topology for inductive power transmission without communication links provided by the embodiments of the present invention has the advantages of improving the system stability and efficiency of the charging process without communication links, and realizing a dual-sided fully soft switch with simple phase shift control, and is applicable to fields such as wireless charging systems for electric vehicles.

[0180] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A control method for inductive power transmission, based on an inductive power transmission circuit, characterized in that, include: Based on the output voltage V at the output terminal of the secondary circuit o and output current I o Determine the duty cycle D of the switched capacitor SCC, where the switched capacitor SCC is the secondary-side compensation capacitor C. s The secondary-side compensation capacitor C s Includes: the fifth power switch S5, capacitor C a and capacitor C b And D5 is C s Anti-parallel diodes; At the primary circuit terminal, control the soft-switching ZVS angle θ. ZA Under the condition of being a constant value, according to the ZVS angle θ ZA The duty cycle D of SCC and the input impedance angle θ AB The relationship determines the phase shift angle of the full-bridge converter. According to the phase shift angle The output voltage V at the output terminal of the secondary circuit o The corresponding relationship controls the output voltage V. o This enables ZVS soft switching and closed-loop control.

2. The method according to claim 1, characterized in that, The output voltage V at the output terminal of the secondary circuit is... o and output current I o Determine the duty cycle D of the switched capacitor SCC, including: Collect the output voltage V at the output terminal of the secondary circuit o and output current I o To determine whether the secondary circuit is in constant voltage output mode or constant current output mode; When the secondary circuit is in constant voltage output mode, the rated voltage reference value V will be... ref With output voltage V o Input the secondary controller PI to output the duty cycle D of SCC; or, When the secondary circuit is in constant current output mode, the rated current reference value I will be used. ref With output current I o The difference, multiplied by the compensation coefficient k, is input to the secondary controller PI to output the duty cycle D of SCC, where k = V. ref / I ref .

3. The method according to claim 2, characterized in that, At the primary circuit terminal, the soft-switching ZVS angle θ is controlled. ZA Under the condition of being a constant value, according to the ZVS angle θ ZA The duty cycle D of SCC and the input impedance angle θ AB The relationship determines the phase shift angle of the full-bridge converter. include: Based on the SCC duty cycle D and θ AB The functional relationship between them determines the input impedance angle θ. AB The calculation formula is: Wherein, capacitor C a and capacitor C b These are the equivalent capacitances of SCC; To satisfy C under ZPA conditions s The impedance value is expressed as ω is the angular frequency of the inductive power transmission circuit; L s For the self-inductance of the secondary coil; C s C is the capacitance value of the secondary-side compensation capacitor. f For secondary resonant capacitor; L f For secondary resonant inductance; R eq For the equivalent load, R eq =0.8R L , where R L For load; At the primary-side circuit terminal, the soft-switching ZVS angle θ is detected by the primary-side controller. ZA To control the ZVS angle θ ZA It is a constant; Determine the phase shift angle of the full-bridge converter based on the formula for the phase angle function. The formula for the phase angle function relationship is as follows:

4. The method according to claim 3, wherein the step of adjusting the phase shift angle... The output voltage V at the output terminal of the secondary circuit o The correspondence formulas include: Among them, v in The inverter output voltage v AB The fundamental voltage, L f M is the secondary resonant inductance, and M is the mutual inductance.

5. The method according to claim 4, characterized in that, The statement is based on the SCC duty cycle D and θ AB The functional relationship between them determines the input impedance angle θ. AB The calculation formula includes: The secondary compensation capacitor C is changed by controlling the duty cycle D of SCC. s The size of C is determined to achieve minimum reactive current control while satisfying ZVS, within the switching cycle. S The formula for the equivalent capacitance value is: According to C s The equivalent capacitance formula (4) and the input impedance angle expression are used to determine the SCC duty cycle D and θ. AB The functional relationship between them, where the input impedance angle expression θ AB for: Among them, C s * To satisfy C under ZPA conditions s The capacitance value, ω is the angular frequency of the induced electrical energy transmission circuit.

6. A control device for inductive power transmission, based on an inductive power transmission circuit, characterized in that, include: The duty cycle determination module is used to determine the duty cycle based on the output voltage V at the output terminal of the secondary circuit. o and output current I o Determine the duty cycle D of the switched capacitor SCC, where the switched capacitor SCC is the secondary-side compensation capacitor C. s The secondary-side compensation capacitor C s Includes: the fifth power switch S5, capacitor C a and capacitor C b And D5 is C s Anti-parallel diodes; The phase shift angle determination module is used to control the soft-switching ZVS angle θ at the primary circuit end. ZA Under the condition of being a constant value, according to the ZVS angle θ ZA The duty cycle D of SCC and the input impedance angle θ AB The relationship determines the phase shift angle of the full-bridge converter. The voltage control module is used to control the voltage based on the phase shift angle. The output voltage V at the output terminal of the secondary circuit o The corresponding relationship controls the output voltage V. o This enables ZVS soft switching and closed-loop control.

7. The apparatus according to claim 6, characterized in that, The phase shift angle determination module is specifically used for: Based on the SCC duty cycle D and θ AB The functional relationship between them determines the input impedance angle θ. AB The calculation formula is: Wherein, capacitor C a and capacitor C b These are the equivalent capacitances of SCC; To satisfy C under ZPA conditions s The impedance value is expressed as ω is the angular frequency of the inductive power transmission circuit; L s For the self-inductance of the secondary coil; C s C is the capacitance value of the secondary-side compensation capacitor. f For secondary resonant capacitor; L f For secondary resonant inductance; R eq For the equivalent load, R eq =0.8R L , where R L For load; C s Cf is the capacitance value of the secondary-side compensation capacitor; Cf is the secondary-side resonant capacitor; L f For secondary resonant inductance; R eq For the equivalent load, R eq =0.8R L , where R L For load; At the primary-side circuit terminal, the soft-switching ZVS angle θ is detected by the primary-side controller. ZA To control the ZVS angle θ ZA It is a constant; Determine the phase shift angle of the full-bridge converter based on the formula for the phase angle function. The formula for the phase angle function relationship is as follows:

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by the processor, the program implements the control method for inductive power transmission as described in any one of claims 1-5.

9. An electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the control method for inductive power transmission as described in any one of claims 1-5.

10. An inductive power transmission circuit, implementing the control method for inductive power transmission as described in any one of claims 1-5, comprising a transmitting module and a receiving module, characterized in that: The transmitting module includes a voltage-fed inverter, a primary-side compensation network, and a primary-side coil; The receiving module includes a secondary coil, a secondary compensation network, and a full-bridge rectifier circuit; The voltage-fed inverter includes: a DC voltage source V in The first power switch S1, the second power switch S2, the third power switch S3, and the fourth power switch S4 are used to invert the DC voltage provided by the DC voltage source into a high-frequency AC voltage. The primary-side compensation network includes: a primary-side resonant capacitor C. p It is used to compensate for excess reactance in the primary and secondary side impedances, and to compensate the output impedance of the voltage-fed inverter to be purely resistive. The secondary-side compensation network includes: a secondary-side compensation capacitor C. s Secondary resonant capacitor C f and secondary resonant inductor L f This is used to compensate for excess reactance in the primary and secondary winding impedances, thus compensating the input impedance of the receiving module to be purely resistive; wherein, the secondary compensation capacitor C s Includes: the fifth power switch S5, capacitor C a and capacitor C b And D5 is C s Anti-parallel diodes; The full-bridge rectifier circuit includes: a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, and a filter capacitor C. o It is used to convert the AC power received on the secondary side into DC power.

Images