Output impedance control method, device, apparatus and storage medium

Abstract

The application discloses an output impedance control method and device, equipment and storage medium, and belongs to the technical field of charging terminal wireless charging. The application obtains demand parameters of a wireless charging system when receiving a charging request of a charging terminal; obtains a duty cycle value range of a controllable rectifier according to the demand parameters; compares the duty cycle value range with a preset duty cycle value range; when the duty cycle value range and the preset duty cycle value range have no intersection, adjusts the duty cycle value range based on the preset duty cycle value range to realize the control of the output impedance. The output impedance of the primary side circuit can be controlled by adjusting the duty cycle value range, and the safety and stability of the wireless charging system are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of charging terminal wireless charging, and in particular to an output impedance control method and device, equipment and a storage medium. BACKGROUND

[0002] Wireless charging is a new charging technology that has emerged in recent years, which can realize charging within a certain space range without the help of charging wires. The main method of its implementation is based on wireless power transfer technology, which uses magnetic resonance coupling, laser, microwave and other principles to transfer electric energy from the power supply end to the power consumption device in a non-contact manner, which can realize wireless charging or power supply of the power consumption device. It has the advantages of safety and reliability, flexibility and convenience, environmental friendliness, and all-weather working, so it has received widespread attention in recent years.

[0003] In a wireless charging circuit, for a high-frequency inverter circuit, when the output impedance is capacitive impedance, the high-frequency switching device has a high risk of damage, so in order to ensure the stable operation of the charging circuit, the output impedance of the primary side inverter needs to be controlled.

[0004] The above content is only used to assist in understanding the technical solutions of the present application and does not represent the acknowledgement of the above content as prior art. SUMMARY

[0005] The main purpose of the present application is to provide an output impedance control method, device, equipment and storage medium, which aims to solve the technical problem of unstable operation of the prior art wireless charging circuit.

[0006] To achieve the above purpose, the present application provides an output impedance control method, which comprises the following steps:

[0007] When receiving a charging request of a charging terminal, obtaining the demand parameters of a wireless charging system;

[0008] According to the demand parameters, obtaining the duty cycle value range of the controllable rectifier;

[0009] Comparing the duty cycle value range with the preset duty cycle value range;

[0010] When there is no intersection between the duty cycle value range and the preset duty cycle value range, adjusting the duty cycle value range based on the preset duty cycle value range to realize the control of the output impedance.

[0011] Optionally, before comparing the duty cycle value range with the preset duty cycle value range, the method further comprises:

[0012] Obtaining different duty cycle values;

[0013] According to the relationship curve between the duty cycle value and the output impedance, reference output impedances corresponding to different duty cycle values are obtained;

[0014] When the imaginary part of the output impedance in the reference output impedance is a positive number, a preset duty cycle value range is obtained from the different duty cycle values.

[0015] Optionally, before the reference output impedances corresponding to the different duty cycle values are obtained according to the relationship curve between the duty cycle value and the output impedance, the method further comprises:

[0016] Different output loads in different secondary circuit parameters are obtained.

[0017] Equivalent load samples are calculated through the different output loads and the different duty cycle values.

[0018] Different primary-secondary circuit parameters and mutual inductance values of the primary-secondary coils of the wireless charging system are obtained.

[0019] Output impedance samples of the primary circuit are obtained through the equivalent load samples, the different primary-secondary circuit parameters and the mutual inductance values.

[0020] A relationship curve between the duty cycle value and the output impedance is obtained based on the different duty cycle values, the equivalent load samples and the output impedance samples.

[0021] Optionally, before the output impedance samples of the primary circuit are obtained through the equivalent load samples, the different primary-secondary circuit parameters and the mutual inductance values, the method further comprises:

[0022] The starting state of the charging terminal is determined.

[0023] When the charging terminal is in a stop state, the step of obtaining the output impedance samples of the primary circuit through the equivalent load samples, the different primary-secondary circuit parameters and the mutual inductance values is performed.

[0024] Optionally, the duty cycle value range of the controllable rectifier is obtained according to the demand parameter, comprising:

[0025] Real-time current and real-time voltage of the charging terminal are obtained.

[0026] The real-time current and the real-time voltage are adjusted through the demand parameter to obtain a duty cycle value range of the controllable rectifier.

[0027] Optionally, when the duty cycle value range and the preset duty cycle value range have no intersection, the duty cycle value range is adjusted based on the preset duty cycle value range to realize the control of the output impedance, comprising:

[0028] adjust the duty cycle value range based on the preset duty cycle value range, so that the duty cycle value range and the preset duty cycle value range have an intersection, and obtain a target duty cycle value range;

[0029] control the output impedance through the target duty cycle value range.

[0030] Optionally, after the duty cycle value range is adjusted based on the preset duty cycle value range so that the duty cycle value range and the preset duty cycle value range have an intersection, the method further comprises:

[0031] determine whether the target duty cycle value range and a preset working point duty cycle value range have an intersection;

[0032] when the target duty cycle value range and the preset working point duty cycle value range have an intersection, obtain a current output power of the charging terminal;

[0033] charge the charging terminal through the current output power.

[0034] In addition, to achieve the above-mentioned purposes, the application further provides an output impedance control device, which comprises:

[0035] a receiving module, which obtains demand parameters of a wireless charging system when receiving a charging request of a charging terminal;

[0036] a obtaining module, which obtains a duty cycle value range of a controllable rectifier according to the demand parameters;

[0037] a comparison module, which compares the duty cycle value range with a preset duty cycle value range;

[0038] an adjusting module, which adjusts the duty cycle value range based on the preset duty cycle value range when the duty cycle value range and the preset duty cycle value range have no intersection, so as to control the output impedance.

[0039] In addition, to achieve the above-mentioned purposes, the application further provides an output impedance control device, which comprises a memory, a processor, and an output impedance control program stored in the memory and executable on the processor, and the output impedance control program is configured to implement the steps of the output impedance control method as described above.

[0040] In addition, to achieve the above-mentioned purposes, the application further provides a storage medium, which stores an output impedance control program, and the output impedance control program implements the steps of the output impedance control method as described above when executed by a processor.

[0041] The application realizes the control of the output impedance by adjusting the duty cycle value range, thereby controlling the output impedance of the primary side circuit and improving the safety and stability of the wireless charging system. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 is the structure diagram of the output impedance control device of the hardware running environment involved in the embodiment scheme of the application.

[0043] Figure 2 is the flowchart of the first embodiment of the output impedance control method of the application.

[0044] Figure 3 is the equivalent circuit structure diagram of the resonance compensation network in the embodiment of the output impedance control method of the application.

[0045] Figure 4 is the flowchart of the second embodiment of the output impedance control method of the application.

[0046] Figure 5 is the flowchart of the third embodiment of the output impedance control method of the application.

[0047] Figure 6 is the flowchart of the fourth embodiment of the output impedance control method of the application.

[0048] Figure 7 is the structure block diagram of the first embodiment of the output impedance control device of the application.

[0049] The implementation, functional features and advantages of the application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0050] It should be understood that the specific embodiments described herein are only used to explain the application and not to limit the application.

[0051] Referring to Figure 1 , Figure 1 is the structure diagram of the output impedance control device of the hardware running environment involved in the embodiment scheme of the application.

[0052] As Figure 1As shown, the output impedance control device can include a processor 1001, such as a Central Processing Unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is configured to realize the connection and communication between the components. The user interface 1003 can include a display, an input unit such as a keyboard, and can further include a standard wired interface, a wireless interface. The network interface 1004 can optionally include a standard wired interface, a wireless interface (such as a Wireless-Fidelity (Wi-Fi) interface). The memory 1005 can be a high-speed Random Access Memory (RAM) memory, or a stable Non-Volatile Memory (NVM) such as a disk memory. The memory 1005 can also be a storage device independent of the aforementioned processor 1001.

[0053] Those skilled in the art can understand that the structure shown in the above Figure 1 The structure shown in the above does not constitute a limitation on the output impedance control device, and can include more or fewer components than those shown, or combine certain components, or different component arrangements.

[0054] As shown in the above Figure 1 The memory 1005 as a storage medium can include an operating system, a network communication module, a user interface module, and an output impedance control program.

[0055] In the output impedance control device shown in the above Figure 1 The network interface 1004 is mainly used for data communication with a network server; the user interface 1003 is mainly used for data interaction with a user; the processor 1001 and the memory 1005 in the output impedance control device of the present application can be arranged in the output impedance control device, and the output impedance control device calls the output impedance control program stored in the memory 1005 through the processor 1001, and executes the output impedance control method provided by the embodiments of the present application.

[0056] The present application provides an output impedance control method, which is described in detail with reference to the Figure 2 , Figure 2 The flowchart of the first embodiment of the output impedance control method of the present application is shown in the above.

[0057] In the above embodiment, the output impedance control method includes the following steps:

[0058] Step S10: When receiving the charging request of the charging terminal, obtain the demand parameter of the wireless charging system.

[0059] It should be noted that the execution subject of the embodiment is the controller for controlling the output impedance, and can also be other devices that can achieve the same or similar functions, and the embodiment does not limit this.

[0060] In specific implementation, the charging terminal can be an electric vehicle, an electric tricycle, or an electric non-motor vehicle, and the embodiment takes the electric vehicle as an example for description. When the electric vehicle needs to be charged, a charging request is generated, and the controller receives the charging request to obtain the demand parameter of the wireless charging system. The demand parameter can include the current, voltage, and power required by the charging terminal for charging. The wireless charging system includes a resonant compensation network equivalent circuit, as shown in Figure 3 . Figure 3 It is a structure diagram of the resonant compensation network equivalent circuit in the embodiment. Wherein R e-re , R e-im are the real part and the imaginary part of the equivalent load respectively, (1+Γ)L p and (1+Λ)L s represent the self-inductance values of the primary coil and the secondary coil respectively, Z1, Z2, Z s , Z3, Z4, Z5, Z in are the output impedances of each link, Z in is the input impedance of the resonant compensation network, which is also the output impedance of the primary side inverter, C s is the secondary series resonant capacitor, C p is the primary series resonant capacitor, U in is the output voltage of the primary inverter, I in is the output current of the primary inverter, C1 is the primary parallel resonant capacitor, L1 is the primary resonant inductance, I p is the current value of the primary coil, M is the mutual inductance value of the primary coil and the secondary coil, I s is the current value of the secondary coil, C2 is the secondary parallel resonant capacitor, L2 is the secondary resonant inductance, and I e is the input current of the secondary rectifier.

[0061] Step S20: Obtain the duty ratio value range of the controllable rectifier according to the demand parameter.

[0062] It should be understood that when the charging terminal accesses the circuit, the transmitted current and voltage will change, and when the transmitted current exceeds the required current in the demand parameter, the duty cycle value range needs to be adjusted so that the transmitted current meets the required current. Further, obtaining the duty cycle value range of the controllable rectifier according to the demand parameter specifically includes: obtaining the real-time current and real-time voltage of the charging terminal; adjusting the real-time current and real-time voltage through the demand parameter to obtain the duty cycle value range of the controllable rectifier.

[0063] In a specific implementation, the duty cycle value range of the controllable rectifier can be measured or calculated in real time. The duty cycle value range of the controllable rectifier is related to the required current and required voltage in the demand parameter. When the real-time current and real-time voltage of the charging terminal after accessing the circuit exceed the required current and required voltage in the demand parameter, the real-time current and real-time voltage are adjusted according to the required current and required voltage in the demand parameter to obtain adjusted real-time current and real-time voltage, and the duty cycle value range of the controllable rectifier is calculated according to the adjusted real-time current and real-time voltage.

[0064] Step S30: comparing the duty cycle value range with a preset duty cycle value range.

[0065] The preset duty cycle value range is a duty cycle value range in which the imaginary part of the output impedance of the primary side circuit under different charging parameters and original secondary side circuit parameters is positive.

[0066] Step S40: when the duty cycle value range and the preset duty cycle value range have no intersection, adjusting the duty cycle value range based on the preset duty cycle value range to realize control of the output impedance.

[0067] It should be noted that, in order to ensure the safety of the circuit, it is necessary to control the related duty cycles in the duty cycle value range to be in the preset duty cycle value range, that is, the duty cycle value range and the preset duty cycle value range have an intersection. The duty cycle value range and the preset duty cycle value range can be compared to determine whether the related duty cycles in the duty cycle value range are in the preset duty cycle value range. When there is no duty cycle in the preset duty cycle value range in the duty cycle value range, the duty cycle value can be adjusted so that the duty cycle value range and the preset duty cycle value range have an intersection, thereby realizing control of the output impedance in the intersection range.

[0068] The embodiment obtains the demand parameter of the wireless charging system when receiving the charging request of the charging terminal, obtains the duty cycle value range of the controllable rectifier according to the demand parameter, compares the duty cycle value range with the preset duty cycle value range, and adjusts the duty cycle value range based on the preset duty cycle value range when there is no intersection between the duty cycle value range and the preset duty cycle value range, so as to control the output impedance. The output impedance of the primary side circuit can be controlled by adjusting the duty cycle value range, and the safety and stability of the wireless charging system are improved.

[0069] Reference Figure 4 , Figure 4 The flowchart of the second embodiment of the output impedance control method is shown.

[0070] Based on the first embodiment, the output impedance control method further includes the following steps before step S30.

[0071] Step S31: Obtain different duty cycle values.

[0072] It should be understood that when the output impedance is controlled, the relationship between the duty cycle value and the output impedance can be established, so that different duty cycle values can be obtained, and the corresponding output impedance can be determined according to the relationship.

[0073] Step S32: Obtain the reference output impedance corresponding to different duty cycle values according to the relationship curve between the duty cycle value and the output impedance.

[0074] In the embodiment, the relationship curve between the duty cycle value and the output impedance is established, so that the output impedance data corresponding to the obtained different duty cycle values, i.e. the reference output impedance, can be obtained. The reference output impedance is the output impedance corresponding to different duty cycle values, and the imaginary part of the reference output impedance has both positive and negative numbers.

[0075] Step S33: When the imaginary part of the output impedance in the reference output impedance is positive, obtain the preset duty cycle value range from the different duty cycle values.

[0076] It should be understood that since the imaginary part of the reference output impedance has both positive and negative numbers, the reference output impedance needs to be screened to obtain the output impedance whose imaginary part is positive, and according to the relationship curve between the duty cycle value and the output impedance, the duty cycle value corresponding to the output impedance whose imaginary part is positive is obtained, so that the preset duty cycle value range is obtained. Since the duty cycle value D is related to the target current and the target voltage of the charging parameter in the electrical stress parameter, the different U in , I out , I outIn the case of duty cycle value D, the duty cycle value range [D min1 —D max1 ]。

[0077] The embodiment obtains different duty cycle values, obtains reference output impedances corresponding to the different duty cycle values according to a relationship curve between the duty cycle values and the output impedances, and obtains a preset duty cycle value range from the different duty cycle values when an imaginary part of the reference output impedance is a positive number, so that the output impedance can be controlled according to the preset duty cycle value range. The safety and stability of the wireless charging system are improved.

[0078] Reference Figure 5 , Figure 5 FIG. 3 is a flowchart of a third embodiment of the output impedance control method.

[0079] Based on the first and second embodiments, the output impedance control method further includes, before the step S32:

[0080] Step S34: Obtain different output loads in different secondary side circuit parameters.

[0081] Step S35: Calculate equivalent load samples through the different output loads and the different duty cycle values.

[0082] It should be noted that when the secondary side controllable rectifier adopts duty cycle control, the equivalent load can be expressed as the following formula 1:

[0083]

[0084] In formula 1, R o is an output load, R e is an equivalent load, u e is a voltage of the equivalent load, i e is a current of the equivalent load, and D is a duty cycle value of the controllable rectifier. The value of D is related to the equivalent load, the voltage of the equivalent load, and the current of the equivalent load in the electrical stress parameter of the wireless charging. When the duty cycle value and the output load are different, the calculated equivalent load is also different.

[0085] Different output loads in different secondary side circuit parameters and different duty cycle values can be obtained, different equivalent loads can be calculated, and equivalent load samples can be counted.

[0086] Step S36: Obtain different primary and secondary side circuit parameters of the wireless charging system and mutual inductance values of primary and secondary side coils.

[0087] The primary side circuit parameters include: current value of the primary side coil, primary side resonance capacitor, primary side resonance capacitor, primary side resonance inductance, current of the primary side circuit and resistance of the primary side circuit, and the secondary side circuit parameters include: real part and imaginary part of the equivalent load of the secondary side circuit, self-inductance value of the secondary side coil, secondary side resonance inductance, current of the secondary side coil, secondary side resonance capacitor, resistance of the secondary side circuit, etc.

[0088] In the calculation of the output impedance, the self-inductance values of the primary and secondary side circuits need to be measured, as shown in the following formula 2, which is the output impedance calculation process:

[0089]

[0090]

[0091]

[0092]

[0093]

[0094]

[0095] Z in (ω)=Z5(ω)+jωL1 (Formula 2)

[0096] In formula 2, Z1, Z2, Z s , Z3, Z4, Z5, Z in are output impedances of each link, Z in is the output impedance of the primary side circuit inverter, Y1(ω), Y2(ω), Y s (ω), Y3(ω), Y4(ω), Y5(ω), Y in (ω) are transconductances of each link, R e-re , R e-im are the real part and imaginary part of the equivalent load respectively, L2 is the secondary side resonance inductance, C2 is the secondary side parallel resonance capacitor, C s is the secondary side series resonance capacitor, R s is the internal resistance of the secondary side coil, L s is the inductance of the secondary side coil, M is the mutual inductance value of the primary side coil and the secondary side coil, (1+Γ)L p and (1+Λ)L s respectively represent the self-inductance values of the primary side coil and the secondary side coil, C p is the primary side series resonance capacitor, R p is the resistance of the primary side coil, C1 is the primary side parallel resonance capacitor, L1 is the primary side resonance inductance, L p is the inductance of the primary side coil. Through the above formula calculation, the output impedance Z of the primary side circuit inverter is obtainedin .

[0097] As can be seen from the above formula 2, the output impedance is related to the resonance network parameters L1, C1, C p 2, C s , etc. in the primary and secondary circuit parameters, and the inductance L p , L s of the coil, and the real part R e-re , the imaginary part R e-im of the equivalent load, and the mutual inductance M of the magnetic coupling mechanism, so that different primary and secondary circuit parameters and the mutual inductance of the primary and secondary coils of the wireless charging system can be obtained, and the output impedance can be calculated.

[0098] In a specific implementation, the present scheme is for output impedance control when the vehicle is charging, so it is necessary to ensure that the charging terminal stops, and when the charging terminal is in a stopped state, the mutual inductance of the primary and secondary coils remains unchanged, and the primary circuit can directly start detecting the mutual inductance M. The method for detecting the value of M can be implemented in various ways, such as a mutual inductor or other methods for detecting mutual inductance, and the present embodiment does not limit this.

[0099] Further, before obtaining the mutual inductance of the primary and secondary coils, it further includes: judging the starting state of the charging terminal; and when the charging terminal is in a stopped state, performing the step of calculating the output impedance sample of the primary circuit by the equivalent load sample, the different primary and secondary circuit parameters, and the mutual inductance.

[0100] By judging the starting state of the charging terminal, the mutual inductance is detected when the charging terminal is in a stopped state. And the equivalent load sample calculated according to different output loads and different duty cycle values is obtained.

[0101] Step S37: Calculate the output impedance sample of the primary circuit by the equivalent load sample, the different primary and secondary circuit parameters, and the mutual inductance.

[0102] It should be noted that different output impedances under different primary and secondary circuit parameters, equivalent load samples, and mutual inductance parameters can be calculated according to the above formula 2 to obtain the output impedance sample of the primary circuit.

[0103] Step S38: Establish a relationship based on the different duty cycle values, the equivalent load sample, and the output impedance sample to obtain a relationship curve between the duty cycle value and the output impedance.

[0104] According to the above formula 1 and formula 2, it is known that the duty cycle value is related to the equivalent load, and the output impedance is also related to the equivalent load. The relationship between the duty cycle value and the output impedance can be established based on the equivalent load sample, different duty cycle values and the output impedance sample, and the relationship curve between the duty cycle value and the output impedance is obtained.

[0105] The embodiment obtains different output loads in different secondary side circuit parameters, calculates the equivalent load sample through the different output loads and the different duty cycle values, obtains the mutual inductance value of the different primary-secondary side circuit parameters and the primary-secondary side coils of the wireless charging system, obtains the output impedance sample of the primary side circuit through the equivalent load sample, the different primary-secondary side circuit parameters and the mutual inductance value calculation, establishes the relationship based on the different duty cycle values, the equivalent load sample and the output impedance sample, obtains the relationship curve between the duty cycle value and the output impedance, and further obtains a more accurate duty cycle value, so as to facilitate accurate control of the output impedance.

[0106] Reference Figure 6 , Figure 6 It is a flowchart of the fourth embodiment of the output impedance control method of the application.

[0107] Based on the above first embodiment, the step S40 of the output impedance control method of the application specifically comprises:

[0108] Step S401: adjusting the duty cycle value range based on the preset duty cycle value range, so that the duty cycle value range and the preset duty cycle value range have an intersection, and obtaining a target duty cycle value range.

[0109] It should be understood that when there is no intersection between the duty cycle value range and the preset duty cycle value range, the duty cycle value range needs to be adjusted so that the duty cycle value range and the preset duty cycle value range have an intersection, and the adjusted duty cycle value range with the intersection, i.e. the target duty cycle value range, is obtained.

[0110] Step S402: controlling the output impedance through the target duty cycle value range.

[0111] Since there is a relationship between the duty cycle value and the output impedance, when the target duty cycle value range is obtained, the output impedance corresponding to the target duty cycle value range with the positive imaginary part can be obtained according to the relationship curve between the duty cycle value and the output impedance, and the condition of the output impedance is realized.

[0112] Further, after adjusting the duty cycle value range based on the preset duty cycle value range, and making the duty cycle value range intersect with the preset duty cycle value range, the method further comprises: determining whether the target duty cycle value range intersects with a preset working point duty cycle value range; when the target duty cycle value range intersects with the preset working point duty cycle value range, obtaining a current output power of the charging terminal; and charging the charging terminal by using the current output power.

[0113] The preset working point duty cycle value range refers to an allowed working point duty cycle value range. The preset working point duty cycle value range is related to electrical stress parameters of key devices in the wireless charging circuit as boundary conditions. In order to ensure the safety of the circuit, it is necessary to control the target duty cycle value range to have a relevant duty cycle in the preset working point duty cycle value range, that is, the preset working point duty cycle value range intersects with the target duty cycle value range. Then, whether the target duty cycle value range intersects with the preset working point duty cycle value range can be determined. When the target duty cycle value range intersects with the preset working point duty cycle value range, it means that the secondary circuit can be directly controlled according to the intersection range of the current target duty cycle value range and the preset working point duty cycle value range. Then, the current output power of the charging terminal during charging can be obtained, and the charging terminal can be wirelessly charged according to the current output power.

[0114] Specifically, when the target duty cycle value range has no intersection or the intersection is very small with the preset working point duty cycle value range, the output power control secondary side circuit according to the current target duty cycle value range and the output power may cause the charging parameters and the electrical stress parameters to exceed the electrical stress parameter boundary value, resulting in damage to the devices in the charging circuit and unsafe use. Therefore, the output power needs to be reduced. And the charging terminal is charged according to the reduced output power. When the target duty cycle value range has no intersection with the preset working point duty cycle value range, the output power can be reduced according to the corresponding relationship between the output power and the preset working point duty cycle value range to obtain the target output power. The corresponding relationship between the output power and the duty cycle value can be established according to the electrical stress parameters to obtain the corresponding relationship between the output power and the preset working point duty cycle value range, so that the size of the preset working point duty cycle value range can be changed by changing the output power, so that the entire wireless charging circuit works in the allowed duty cycle range of the working point. The electrical stress parameters during charging of the charging terminal can be obtained, and the electrical stress parameters are the charging parameters and the circuit parameters in the wireless charging process, at least including one or more of the input voltage of the primary side inverter, the input current of the primary side inverter, the current value of the primary side coil, the current value of the secondary side coil, the output current of the secondary side rectifier and the output voltage of the secondary side rectifier, which are not limited by the embodiment. And based on the corresponding relationship between the output power and the preset working point duty cycle value range and the electrical stress parameters, the target output power is controlled, and when there is no intersection or the intersection is too small between the target duty cycle value range and the preset working point duty cycle value range, it means that the output power is too large at this time, which does not meet the required output power for charging, so the output power for charging the current charging terminal needs to be reduced according to the corresponding relationship between the output power and the preset working point duty cycle value range and the electrical stress parameters, to ensure the safety and stability of the circuit during charging, and also ensure the safety of the devices corresponding to the electrical stress parameters in the charging circuit.

[0115] The embodiment adjusts the duty cycle value range based on the preset duty cycle value range, so that the duty cycle value range has an intersection with the preset duty cycle value range, and obtains a target duty cycle value range. The target duty cycle value range is used to control the output impedance, thereby improving the safety and stability of the wireless charging system.

[0116] Reference Figure 7 , Figure 7 The structure block diagram of the first embodiment of the output impedance control device of the application is shown in the figure.

[0117] As Figure 7 shown, the output impedance control device provided by the embodiment of the application comprises:

[0118] The receiving module 10 obtains the demand parameters of the wireless charging system when receiving the charging request of the charging terminal.

[0119] The acquisition module 20 is configured to acquire a duty cycle value range of the controllable rectifier according to the demand parameter.

[0120] The comparison module 30 is configured to compare the duty cycle value range with a preset duty cycle value range.

[0121] The adjustment module 40 is configured to, when there is no intersection between the duty cycle value range and the preset duty cycle value range, adjust the duty cycle value range based on the preset duty cycle value range to realize the control of the output impedance.

[0122] The embodiment realizes the control of the output impedance by acquiring the demand parameter of the wireless charging system when receiving the charging request of the charging terminal, acquiring the duty cycle value range of the controllable rectifier according to the demand parameter, comparing the duty cycle value range with a preset duty cycle value range, and adjusting the duty cycle value range based on the preset duty cycle value range when there is no intersection between the duty cycle value range and the preset duty cycle value range, so that the output impedance of the primary side circuit is controlled by adjusting the duty cycle value range, and the safety and stability of the wireless charging system are improved.

[0123] In an embodiment, the comparison module 30 is further configured to acquire different duty cycle values; obtain reference output impedances corresponding to the different duty cycle values according to a relationship curve between the duty cycle values and the output impedances; and acquire the preset duty cycle value range from the different duty cycle values when an imaginary part of the reference output impedance is a positive number.

[0124] In an embodiment, the comparison module 30 is further configured to acquire different output loads in different secondary side circuit parameters; calculate equivalent load samples through the different output loads and the different duty cycle values; acquire different primary side and secondary side circuit parameters of the wireless charging system and mutual inductance values of primary and secondary side coils; obtain output impedance samples of the primary side circuit through the equivalent load samples, the different primary side and secondary side circuit parameters, and the mutual inductance values; and establish a relationship based on the different duty cycle values, the equivalent load samples, and the output impedance samples to obtain the relationship curve between the duty cycle values and the output impedances.

[0125] In an embodiment, the comparison module 30 is further configured to judge a starting state of the charging terminal; and execute the step of obtaining the output impedance samples of the primary side circuit through the equivalent load samples, the different primary side and secondary side circuit parameters, and the mutual inductance values when the charging terminal is in a stop state.

[0126] In an embodiment, the obtaining module 20 is further configured to obtain real-time current and real-time voltage of the charging terminal; and adjust the real-time current and the real-time voltage by the demand parameter to obtain a duty cycle value range of the controllable rectifier.

[0127] In an embodiment, the adjusting module 40 is further configured to adjust the duty cycle value range based on the preset duty cycle value range, so that the duty cycle value range intersects with the preset duty cycle value range to obtain a target duty cycle value range; and control the output impedance by the target duty cycle value range.

[0128] In an embodiment, the adjusting module 40 is further configured to determine whether the target duty cycle value range intersects with a preset working point duty cycle value range; and when the target duty cycle value range intersects with the preset working point duty cycle value range, obtain current output power of the charging terminal; and charge the charging terminal by the current output power.

[0129] In addition, to achieve the above object, the present application further provides an output impedance control device, which comprises a memory, a processor, and an output impedance control program stored in the memory and executable on the processor, and the output impedance control program is configured to implement the steps of the output impedance control method as described above.

[0130] Since the output impedance control device adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0131] In addition, the present application further provides a storage medium, which stores an output impedance control program, and the output impedance control program, when executed by a processor, implements the steps of the output impedance control method as described above.

[0132] Since the storage medium adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0133] It should be understood that the above is only for illustration, and does not constitute any limitation on the technical solutions of the present application. In specific applications, those skilled in the art can set it according to the needs, and the present application does not limit it.

[0134] It should be noted that the above-described workflow is only illustrative and does not limit the scope of protection of the present application. In actual application, those skilled in the art can select part or all of them to achieve the purpose of the embodiment scheme according to actual needs, which is not limited here.

[0135] In addition, technical details not described in detail in the present embodiment can be found in the output impedance control method provided by any embodiment of the present application, which will not be described here.

[0136] In addition, it should be noted that in this document, the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusions, so that a process, method, article or system including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such a process, method, article or system. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or system including the element.

[0137] The above-mentioned embodiment numbers of the present application are only for description, not representing the advantages and disadvantages of the embodiments.

[0138] From the above description of the embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be realized by means of software and necessary general hardware platforms, of course, they can also be realized by hardware, but in many cases the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of a software product, which is stored in a storage medium (such as a read-only memory (ROM) / RAM, a magnetic disk, an optical disk), and includes a number of instructions for making a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) execute the methods described in various embodiments of the present application.

[0139] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields based on the content of the present application specification and drawings, are also included in the patent protection scope of the present application.

Claims

1. An output impedance control method characterized by comprising: The output impedance control method comprises: Upon receiving a charging request of a charging terminal, obtaining a demand parameter of a wireless charging system; According to the demand parameter, obtaining a duty cycle value range of a controllable rectifier; Obtaining different duty cycle values, and according to a relationship curve between the duty cycle values and output impedances, obtaining reference output impedances corresponding to the different duty cycle values, and when an imaginary part of the reference output impedance is a positive number, obtaining a preset duty cycle value range from the different duty cycle values; Comparing the duty cycle value range with the preset duty cycle value range; When the duty cycle value range has no intersection with the preset duty cycle value range, adjusting the duty cycle value range based on the preset duty cycle value range, so that an imaginary part of an output impedance corresponding to the adjusted duty cycle value range remains a positive number, to realize control of the output impedance.

2. The output impedance control method according to claim 1, wherein Before the obtaining of the reference output impedances corresponding to the different duty cycle values according to the relationship curve between the duty cycle values and the output impedances, the method further comprises: Obtaining different output loads in different secondary circuit parameters; Calculating equivalent load samples through the different output loads and the different duty cycle values; Obtaining different primary-secondary circuit parameters of the wireless charging system and mutual inductance values of primary and secondary coils; Obtaining output impedance samples of a primary circuit through calculation of the equivalent load samples, the different primary-secondary circuit parameters and the mutual inductance values; Establishing a relationship based on the different duty cycle values, the equivalent load samples and the output impedance samples to obtain a relationship curve between the duty cycle values and the output impedances.

3. The output impedance control method according to claim 2, wherein Before the obtaining of the output impedance samples of the primary circuit through calculation of the equivalent load samples, the different primary-secondary circuit parameters and the mutual inductance values, the method further comprises: Judging a starting state of the charging terminal; When the charging terminal is in a stop state, performing the step of obtaining the output impedance samples of the primary circuit through calculation of the equivalent load samples, the different primary-secondary circuit parameters and the mutual inductance values.

4. The output impedance control method according to claim 1, wherein The obtaining of the duty cycle value range of the controllable rectifier according to the demand parameter comprises: Obtaining real-time current and real-time voltage of the charging terminal; Adjusting the real-time current and the real-time voltage through the demand parameter to obtain a duty cycle value range of the controllable rectifier.

5. The output impedance control method according to any one of claims 1 to 4, wherein The adjusting of the duty cycle value range based on the preset duty cycle value range, so that an imaginary part of an output impedance corresponding to the adjusted duty cycle value range remains a positive number, to realize control of the output impedance, comprises: Adjusting the duty cycle value range based on the preset duty cycle value range, so that the duty cycle value range has intersection with the preset duty cycle value range, to obtain a target duty cycle value range; Realizing control of the output impedance through the target duty cycle value range, so that an imaginary part of the output impedance remains a positive number.

6. The output impedance control method according to claim 5, wherein After the adjusting of the duty cycle value range based on the preset duty cycle value range, so that the duty cycle value range has intersection with the preset duty cycle value range, the method further comprises: determine whether the target duty cycle value range and a preset working point duty cycle value range exist intersection; when the target duty cycle value range and the preset working point duty cycle value range exist intersection, acquire a current output power of the charging terminal; charge the charging terminal through the current output power.

7. An output impedance control device characterized by comprising: The output impedance control device comprises: a receiving module configured to acquire demand parameters of a wireless charging system when receiving a charging request of a charging terminal; an acquiring module configured to acquire a duty cycle value range of a controllable rectifier according to the demand parameters, and further configured to acquire different duty cycle values, obtain reference output impedances corresponding to the different duty cycle values according to a relationship curve between the duty cycle values and the output impedances, and acquire a preset duty cycle value range from the different duty cycle values when an imaginary part of the output impedance in the reference output impedances is a positive number; a comparing module configured to compare the duty cycle value range and the preset duty cycle value range; an adjusting module configured to adjust the duty cycle value range based on the preset duty cycle value range when the duty cycle value range and the preset duty cycle value range do not exist intersection, so that an imaginary part of an output impedance corresponding to the adjusted duty cycle value range remains a positive number, to realize control of the output impedance.

8. An output impedance control device, characterized by comprising: The output impedance control device comprises a memory, a processor, and an output impedance control program stored in the memory and executable on the processor, and the output impedance control program is configured to implement the output impedance control method in any one of claims 1 to 6.

9. A storage medium, characterized by The storage medium has an output impedance control program stored thereon, and the output impedance control program is executed by the processor to implement the output impedance control method in any one of claims 1 to 6.

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