Wireless charging control system and method with multi-coil dynamic decoupling and frequency division drive

Abstract

This invention provides a wireless charging control system and method based on multi-coil dynamic decoupling and frequency division driving. The system includes: a power supply module, a charging control module, a concentric nested coil group, N driving circuit modules, and N corresponding dynamic decoupling modules. The concentric nested coil group is composed of N concentrically nested coils. The tap of each coil is connected to a driving circuit module via a dynamic decoupling module. Each dynamic decoupling module is connected to the charging control module. Each driving circuit module is connected to both the power supply module and the charging control module. This invention employs a wireless charging control scheme combining dynamic decoupling control and frequency division driving strategies on a concentric nested multi-coil structure, achieving compatibility between charging efficiency and fault tolerance while ensuring free positioning functionality.

Description

Technical Field

[0001] This invention relates to the field of wireless power transfer technology, specifically to a wireless charging control system and method for multi-coil dynamic decoupling and frequency division driving. Background Technology

[0002] With the increasing popularity of wireless charging technology, users have higher and higher requirements for charging convenience (i.e., free positioning). To achieve free positioning, the current mainstream technology uses a planar multi-coil array scheme, selecting the single coil with the strongest signal for power supply through signal strength detection. However, this technology has the following significant drawbacks:

[0003] 1. The contradiction between efficiency and fault tolerance. It is difficult for a fixed-size transmitting coil to simultaneously achieve high peak efficiency and wide fault tolerance: small coils are efficient when aligned, but have low tolerance for misalignment; large coils have good fault tolerance, but efficiency drops significantly when aligned.

[0004] 2. Severe eddy current losses. Electromagnetic coupling between multiple coils can cause significant eddy currents in unselected dormant coils, resulting in severe energy loss and device overheating. Actual measurements show that at a charging power of 10W, the eddy current loss of the dormant coil can reach 12% of the total power. This not only leads to more than 15% energy waste but also causes the device surface temperature to rise by 8-10℃, posing a potential overheating safety hazard.

[0005] Therefore, there is an urgent need in the field for a new wireless charging solution that can simultaneously address energy transfer efficiency, spatial positioning freedom, and thermal management performance. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a wireless charging control system and method with multi-coil dynamic decoupling and frequency division drive, which can achieve compatibility between charging efficiency and fault tolerance while ensuring free positioning function, and significantly improve the energy transmission efficiency of the system.

[0007] To solve the above-mentioned technical problems, the first technical solution adopted by the present invention is as follows:

[0008] A wireless charging control system with multi-coil dynamic decoupling and frequency division drive includes: a power supply module, a charging control module, a concentric nested coil group, N driving circuit modules and N corresponding dynamic decoupling modules; the concentric nested coil group is composed of N coils nested concentrically; N is an integer greater than 1;

[0009] Each coil tap is connected to a drive circuit module via a dynamic decoupling module; each dynamic decoupling module is connected to the charging control module; each drive circuit module is connected to both the power supply module and the charging control module.

[0010] The charging control module is configured to perform the following steps:

[0011] S1: Pre-store a frequency lookup table, which records the optimal operating frequency value for each coil;

[0012] S2: After system initialization, control N dynamic decoupling modules to disconnect the N electrical circuits from the power supply module to the N coils;

[0013] S3: Start the coil polling detection process: By controlling the corresponding dynamic decoupling module, turn on the N electrical circuits one by one and send a Ping detection signal;

[0014] S4: In the coil polling detection process, if a feedback signal of a coil is received, the corresponding coil coupling quality is parsed and obtained. After completing a round of N-way electrical circuit detection starting with the electrical circuit corresponding to the coil, the N dynamic decoupling modules are controlled to disconnect the N-way electrical circuit.

[0015] S5: Compare the coil coupling quality of each coil obtained in the N-way electrical circuit detection to determine the optimal working coil;

[0016] S6: First, control the dynamic decoupling module corresponding to the optimal working coil to make the corresponding electrical circuit conduct; then configure the output frequency of the drive circuit module corresponding to the optimal working coil to the optimal working frequency value corresponding to the optimal working coil in the frequency lookup table.

[0017] Optionally, the charging control module is further configured to perform the following steps:

[0018] S7: After the drive circuit module corresponding to the optimal working coil starts energy transmission at the optimal working frequency value, it starts monitoring and timing.

[0019] S8: After the monitoring time reaches the preset monitoring cycle, the corresponding electrical circuit is disconnected by controlling the dynamic decoupling module corresponding to the optimal working coil, and then the process returns to execute S3.

[0020] Optionally, the dynamic decoupling module includes a gate drive circuit, a switch QA, and a switch QB; the input terminal of the gate drive circuit is connected to the charging control module, and its output terminal is connected to two taps of the corresponding coil via the switch QA and the switch QB respectively; the switch QA and the switch QB are also connected to the output terminal of the corresponding drive circuit module respectively.

[0021] Optionally, the charging control module includes multiple GPIOs; the gate drive circuits of the N dynamic decoupling modules are connected to the multiple GPIOs.

[0022] Optionally, the switching transistors QA and QB are one of the following: MOSFET, transistor, thyristor, IGBT, or relay.

[0023] Optionally, the concentric nested coil group is composed of an inner coil, a middle coil, and an outer coil nested concentrically; the inductance value of the inner coil is 2.0 μH; the inductance value of the middle coil is 4.7 μH; and the inductance value of the outer coil is 8.2 μH.

[0024] Another technical solution provided by this invention is:

[0025] A wireless charging control method based on multi-coil dynamic decoupling and frequency division driving includes: a power supply module, a charging control module, a concentric nested coil group, N driving circuit modules, and N corresponding dynamic decoupling modules; the concentric nested coil group is composed of N concentrically nested coils; N is an integer greater than 1; the tap of each coil is connected to a driving circuit module via a dynamic decoupling module; each dynamic decoupling module is connected to the charging control module; each driving circuit module is connected to both the power supply module and the charging control module.

[0026] S1: A frequency lookup table is pre-stored in the charging control module, and the frequency lookup table records the optimal operating frequency value corresponding to each coil;

[0027] S2: After system initialization, the charging control module controls N dynamic decoupling modules to disconnect the N electrical circuits from the power supply module to the N coils;

[0028] S3: The charging control module initiates the coil polling detection process: by controlling the corresponding dynamic decoupling module, the N electrical circuits are turned on one by one, and a Ping detection signal is sent;

[0029] S4: In the coil polling detection process, if the charging control module receives a feedback signal from a coil, it will analyze and obtain the corresponding coil coupling quality, and after completing a round of N-way electrical circuit detection starting with the electrical circuit corresponding to the coil, it will control N dynamic decoupling modules to disconnect the N-way electrical circuit.

[0030] S5: The charging control module compares the coil coupling quality of each coil obtained in the N-way electrical circuit detection in one round and obtains the optimal working coil;

[0031] S6: The charging control module first controls the dynamic decoupling module corresponding to the optimal working coil to make the corresponding electrical circuit conduct; then it configures the output frequency of the drive circuit module corresponding to the optimal working coil to the optimal working frequency value corresponding to the optimal working coil in the frequency lookup table.

[0032] Optionally, it also includes:

[0033] S7: After the drive circuit module corresponding to the optimal working coil starts energy transmission at the optimal working frequency value, it starts monitoring and timing.

[0034] S8: After the monitoring time reaches the preset monitoring cycle, the corresponding electrical circuit is disconnected by controlling the dynamic decoupling module corresponding to the optimal working coil, and then the process returns to S3.

[0035] Optionally, the analysis in S3 to obtain the corresponding coil coupling quality includes:

[0036] The received feedback signal is analyzed to obtain the Received Signal Strength Indication (RSSI) value, which is then used as the coil coupling quality of the coil.

[0037] Optionally, the optimal operating frequency value corresponding to each coil in the frequency lookup table is determined according to the formula Q=(2 The value is obtained by calculating f(L) / R; where Q is the quality factor of the coil, which is taken from the peak point of the coil's operating frequency curve; f is the optimal operating frequency of the coil; L is the inductance of the coil; and R is the equivalent series resistance of the coil.

[0038] The beneficial effects of this invention are as follows: This invention employs a wireless charging control scheme combining dynamic decoupling control and frequency division driving strategies on a concentric nested multi-coil structure. This not only achieves intelligent matching of coil dimensions and elimination of eddy current losses, significantly improving wireless charging efficiency, expanding the charging area, and suppressing heat generation, but also intelligently matches the optimal operating frequency for different coils, ensuring that the working coil is always in its most efficient operating state, further improving the overall efficiency of wireless charging. Therefore, the wireless charging control scheme of this invention can achieve compatibility between charging efficiency and fault tolerance while ensuring free positioning functionality. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structure of a wireless charging control system with multi-coil dynamic decoupling and frequency division drive provided in an embodiment of the present invention;

[0040] Figure 2 This is a schematic diagram of the concentric nested coil group in a specific implementation embodiment;

[0041] Figure 3 This is a flowchart illustrating a wireless charging control scheme that combines dynamic decoupling control and frequency division driving strategies in a concentric nested multi-coil structure, as described in an embodiment of the present invention.

[0042] Label Explanation:

[0043] 101. Power supply module; 102. Charging control module; 103. Concentric nested coil group;

[0044] 104 (104-1 to 104-n), drive circuit module;

[0045] 105 (105-1 to 105-n), dynamic decoupling module. Detailed Implementation

[0046] To explain in detail the technical principles, specific implementable solutions, possible application scenarios, and achievable objectives and effects of the present invention, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. It is understood that the embodiments described herein and the embodiments shown in the accompanying drawings are only used to more clearly illustrate the technical solutions of the present invention, and are therefore only examples intended to explain the present invention, and should not be construed as limiting the present invention. It should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein.

[0047] This invention employs a wireless charging control scheme that combines dynamic decoupling control and frequency division drive strategies on a concentric nested multi-coil structure. This scheme can ensure free positioning while achieving compatibility between charging efficiency and fault tolerance.

[0048] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0049] Figure 1 This is a schematic diagram of a wireless charging control system with multi-coil dynamic decoupling and frequency division drive provided in an embodiment of the present invention.

[0050] This invention provides a wireless charging control system with multi-coil dynamic decoupling and frequency division drive, such as... Figure 1 As shown, it includes a power supply module 101, a charging control module 102, a concentric nested coil group 103, and N drive circuit modules 104 (such as...). Figure 1 As shown in Figures 104-1 to 104-n) and the N corresponding dynamic decoupling modules 105 (e.g. Figure 1 As shown in 105-1 to 105-n); the concentric nested coil group 103 consists of N concentrically nested coils ( Figure 1 The L1 to Ln shown are used; N is an integer greater than 1, and n is N-1;

[0051] Each coil in the concentric nested coil group 103 ( Figure 1 The taps (L1 to Ln) shown are connected to a drive circuit module 104 via a dynamic decoupling module 105; each dynamic decoupling module 105 is connected to the charging control module 102; each drive circuit module 104 is connected to the power supply module 101 and the charging control module 102 respectively.

[0052] In some specific implementations, such as Figure 1 As shown, each coil includes two taps, tap A and tap B. Correspondingly, each dynamic decoupling module 105 includes a gate drive circuit GDC and two switching elements (switch QA and switch QB). The input terminal of the gate drive circuit GDC is connected to the charging control module 102, and its output terminal is connected to taps A and B of the corresponding coil via switches QA and QB, respectively. Switches QA and QB are also connected to the output terminals of the corresponding drive circuit module 105. Optionally, switches QA and QB, as switching elements, can be MOSFETs, transistors, thyristors, IGBTs, or relays to implement the switching function of the electrical circuit.

[0053] Based on the dynamic decoupling module structure of this embodiment, when a shutdown command is received, its switching element will perform a shutdown operation, making the corresponding coil circuit electrically open, thereby realizing the physical and complete disconnection of the coil electrical circuit, ensuring the reliability and thoroughness of the shutdown process, and fundamentally solving the energy loss and heat generation problem caused by electromagnetic induction in non-working coils.

[0054] In some specific embodiments, the charging control module is provided with multiple GPIOs; the gate drive circuits of the N dynamic decoupling modules are connected to the multiple GPIOs; the charging control module controls each gate drive circuit through the multiple GPIOs; each gate drive circuit then controls the conduction and disconnection of its connected switch QA and switch QB accordingly.

[0055] In some specific embodiments, the concentric nested coil group 103 is composed of at least two first coils L1 and second coils L2 with different diameters nested together in a circular pattern. Specifically, the number of coil turns, the optimal diameter of each coil, and the spacing between each coil can be determined experimentally based on the receiving coil size of the target power receiving device (such as a mobile phone) to achieve the best size matching effect.

[0056] Optionally, such as Figure 1 As shown and Figure 2 As shown, the concentric nested coil group 103 consists of three coils nested together in a circular pattern: an inner coil L1, a middle coil L2, and an outer coil L3. Taps A and B of each coil are connected to the corresponding switching transistors QA and QB in the dynamic decoupling module. For example, tap A of the first coil L1 is connected to switching transistor Q1-A, and tap B is connected to switching transistor Q1-B; the tap connections of the other coils are similar.

[0057] In this embodiment, the wireless charging control system configured at the power transmitting end is defined as the coils in the concentric nested coil group, which are transmitting coil L1, transmitting coil L2, ... transmitting coil Ln.

[0058] In this embodiment, the power supply module 101 is configured to convert external input electrical energy into the operating voltage / current required by the wireless charging control system.

[0059] The charging control module 102 is configured to execute a wireless charging communication protocol (such as the Qi protocol), output a decoupling control signal to the dynamic decoupling module according to a dynamic decoupling control strategy, and output a power control signal to the drive circuit module according to a frequency division drive strategy.

[0060] Specifically, when implementing the dynamic decoupling control strategy, the charging control module 102 will output a decoupling control signal to its corresponding dynamic decoupling module based on the selected "optimal working coil" to control only the "optimal electrical circuit" to be turned on, while other electrical circuits are turned off; when implementing the frequency division drive strategy, it will dynamically adjust the output of the corresponding drive circuit module to the "optimal working frequency" based on the selected "optimal working coil".

[0061] The drive circuit module 104 (such as Figure 1 The 104-1 to 104-n shown are configured to convert the DC power output by the charging module into high-frequency AC power in response to the power control signal issued by the charging control module, and then send it to the corresponding coil via the dynamic decoupling module.

[0062] The dynamic decoupling module 105 (such as...) Figure 1 The circuits 105-1 to 105-n shown are configured to connect or disconnect the electrical circuit of the coil connected to them by controlling the on / off state of their own switches in response to the decoupling control signal issued by the charging control module.

[0063] In particular, such as Figure 3 As shown, the charging control module 102 is specifically configured to perform the following steps S1-S6 to achieve dynamic decoupling and frequency division drive functions.

[0064] In step S1, a frequency lookup table is pre-stored, which records the optimal operating frequency value corresponding to each coil.

[0065] The frequency lookup table records the optimal operating frequency value (e.g., f1, f2, ... fn) for each coil (numbered L1, L2, ... Ln). This frequency lookup table is used in the frequency division drive strategy as a basis for dynamically adjusting the output frequency of the drive circuit, so that the coil operates at the optimal operating frequency, thereby optimizing the coil's quality factor (Q value).

[0066] In step S2, after system initialization, the N dynamic decoupling modules are controlled to disconnect the N electrical circuits from the power supply module to the N coils. This cuts off the power supply from the power supply module to all coils, ensuring that there is no electromagnetic coupling between coils during subsequent individual testing of each coil, thus guaranteeing testing accuracy.

[0067] In step S3, the coil polling detection process is initiated: by controlling the corresponding dynamic decoupling module, the N electrical circuits are turned on one by one, and a Ping detection signal is sent.

[0068] The Ping detection signal is a digital Ping detection signal that conforms to a wireless charging protocol (such as the Qi protocol). In existing technologies, the digital Ping signal is a power pulse signal that is controlled by all coils to be sent simultaneously only after the transmitting end (charging pad) detects a foreign object (FOD), used to verify whether the receiving end (such as a mobile phone) is in a valid charging position. In this embodiment, the triggering of the digital Ping signal does not depend on the FOD detection result. It is embedded in the coil polling detection process, and all coils will actively send signals one by one in sequence. This is used to dynamically identify the coil that achieves optimal coupling with the power receiving end (powered device) based on the feedback signal, and to select the "optimal working coil".

[0069] In step S4, during the coil polling detection process, if a feedback signal from a coil is received, the corresponding coil coupling quality is analyzed and obtained. After completing a round of N-way electrical circuit detection starting with the electrical circuit corresponding to the coil, the N dynamic decoupling modules are controlled to disconnect the N-way electrical circuits.

[0070] It is understood that in the coil polling detection process, if no feedback signal is received from the coil, the detection is performed in the order of L1, L2, L3...Ln, starting with coil L1; if a feedback signal is received from any coil (let's say coil L3), the detection is performed in the order of L3, L4, L5...Ln, L1, L2, starting with that coil.

[0071] After the coil polling detection process is completed, all circuit loops from the power supply module to the coil must be disconnected again. This provides a fundamental guarantee for subsequent selection of the "best working coil" and implementation of targeted power supply, avoiding electromagnetic coupling interference between coils.

[0072] In step S5, the coil coupling quality of each coil obtained in the N-way electrical circuit detection is compared to determine the optimal working coil.

[0073] The optimal operating coil on a charging device, also known as an "effectively coupled coil," specifically refers to a transmitting coil on the charging device that is precisely matched to the receiving coil of the powered device. It typically meets the following key characteristics: 1. Frequency and resonance matching, meaning precise matching with the operating frequency of the receiving coil; 2. Spatial alignment and maximum electromagnetic field strength, meaning close spatial alignment with the receiving coil of the powered device, maximizing the induction of the alternating magnetic flux change of the transmitting coil into the receiving coil; 3. Strongest anti-interference and compatibility, meaning it experiences the weakest electromagnetic interference compared to other transmitting coils, effectively meeting the interoperability requirements of wireless charging standards.

[0074] In step S6, the corresponding electrical circuit is first turned on by controlling the dynamic decoupling module corresponding to the optimal working coil; then the output frequency of the drive circuit module corresponding to the optimal working coil is configured to the optimal working frequency value corresponding to the optimal working coil in the frequency lookup table.

[0075] Once the optimal working coil is identified, and all electrical circuits are physically and completely disconnected beforehand via the corresponding dynamic decoupling module, the charging control module controls the closure of the dynamic decoupling module corresponding to the optimal working coil to selectively control the power supply to only the "optimal electrical circuit." In this embodiment, the charging control module adjusts the dynamic decoupling module in real time according to the "dynamic decoupling strategy," enabling precise dynamic decoupling control of the electrical circuits of each coil in a multi-coil system. By completely cutting off the electrical circuits of non-working coils in real time, parasitic eddy currents generated by electromagnetic induction in traditional multi-coil systems are completely eliminated, fundamentally solving the problems of energy loss and heat generation. Therefore, the "dynamic decoupling strategy" implemented by the charging control module not only improves system energy efficiency (meeting the optimization requirements of multi-coil switching in wireless charging standards) but also ensures the on-demand establishment of energy transmission paths by dynamically adjusting the coil coupling state, significantly improving the stability and reliability of wireless charging.

[0076] In addition, after the charging control module conducts the "optimal electrical circuit" according to the "dynamic decoupling strategy", the charging control module will also control the corresponding drive circuit module to transmit energy at the optimal operating frequency of the optimal working coil according to the "frequency division drive strategy". By accurately matching the optimal operating frequency of the coil, frequency division drive is realized to ensure that energy transmission always takes place at the optimal frequency, thereby further improving the energy transmission efficiency of the system.

[0077] It is particularly important to note that the charging control module in this embodiment adopts a "decoupling first, then power supply" timing control principle: before activating any coil, its dynamic decoupling module must be closed first, that is, its electrical circuit must be turned on, and then its drive circuit module must be turned on to transfer energy. This ensures that each "decoupling" control is effective.

[0078] As a specific example of this embodiment, the inductance value of the first coil L1 in the inner circle of the concentric nested coil group is 2.0μH, the inductance value of the second coil L2 in the middle circle is 4.7μH, and the inductance value of the third coil L3 in the outer circle is 8.2μH; the charging control module can be implemented using a microcontroller of model STM32G0; the driving circuit module can be implemented using a full-bridge inverter circuit composed of four MOSFETs; the switching element in the dynamic decoupling module can be implemented using an N-channel enhancement-mode power MOSFET with an on-resistance (Rds(on)) of less than 10mΩ, and the gate driving circuit can be constructed using a BJT transistor circuit.

[0079] The working principle based on the above specific example is as follows: During operation, the charging control module executes... Figure 3 The process is illustrated below. During this period, when the powered device is placed at the edge of the charging pad, the system's charging control module detects that it has the best coupling with the second coil L2 located in the middle coil. After selecting it as the "optimal working coil," the charging control module first controls the two MOSFETs (Q2-A, Q2-B) in the dynamic decoupling module corresponding to the second coil L2 to conduct, thereby conducting its electrical circuit. Then, it looks up the optimal working frequency value corresponding to the second coil L2 in the table and configures the drive circuit module corresponding to the second coil L2 to this frequency value, so that the second coil L2 operates at its highest efficiency point, thereby achieving precise and efficient power supply to the powered device. During the operation of the second coil L2, the dynamic decoupling modules corresponding to other coils remain in the off state, ensuring that the non-working coil circuits are open, effectively avoiding energy loss and heat generation.

[0080] Unlike existing wireless charging control systems, the wireless charging control system provided in this embodiment has the following two innovative improvements:

[0081] (1) In terms of hardware structure, a concentric nested coil group structure is adopted, which makes it convenient for the system to accurately locate the most matching transmitting coil according to the position of the receiving coil of the power receiving device; each coil is equipped with a dedicated "driving circuit module + dynamic decoupling module" control combination, and "dynamic decoupling + frequency division driving" is realized under the coordinated control of the charging control module.

[0082] (2) In terms of functional configuration, the charging control module is configured with a synergistic “dynamic decoupling strategy” and “frequency division drive strategy”. Through precise control of the drive circuit module and the dynamic decoupling module, it is possible to only conduct the best electrical circuit and precisely match the best working coil to supply energy at the optimal frequency.

[0083] By combining the aforementioned hardware structure and functional configuration, the multi-coil dynamic decoupling and frequency division drive wireless charging control system provided in this embodiment can intelligently select the coil with the best size match as the working coil, achieving free positioning and improving charging convenience. Through the implementation of the "dynamic decoupling strategy," it ensures that only the optimal electrical circuit is activated, eliminating eddy current losses in non-working coils. Through the implementation of the "frequency division drive strategy," it matches the optimal operating frequency in real time, ensuring that energy transmission is always in an optimal state. This achieves intelligent perception and dynamic optimization of the system state, simultaneously achieving the two major goals of high efficiency and free positioning. This not only solves the fundamental problems of traditional multi-coil systems (energy loss, heat generation, low line fault tolerance, etc.) but also significantly improves charging efficiency, maximizing the overall system efficiency.

[0084] In some preferred embodiments of this example, the charging control module is further configured with a cyclic monitoring cycle for the coil polling detection process, so as to enable the system to periodically restart the detection of the "best working coil" and dynamically switch the corresponding electrical circuit and operating frequency accordingly.

[0085] Specifically, such as Figure 3 As shown, the charging control module is further configured to perform the following steps after completing step S6:

[0086] S7: After the drive circuit module corresponding to the optimal working coil starts energy transmission at the optimal working frequency value, it starts monitoring and timing.

[0087] S8: After the monitoring time reaches the preset monitoring cycle, the corresponding electrical circuit is disconnected by controlling the dynamic decoupling module corresponding to the optimal working coil, and then the process returns to execute S3.

[0088] As a specific example, the monitoring period can be any time period greater than or equal to 2 seconds, and the specific value can be flexibly adjusted according to the positioning sensitivity requirements.

[0089] In other words, after each time the "optimal working coil" is activated to transmit power at the optimal operating frequency for a certain period of time, the coil polling detection process will be restarted to reselect the "optimal working coil," and then dynamic switching will be achieved through the "dynamic decoupling strategy" and the "frequency division drive strategy." Through the periodic polling detection and dynamic switching mechanism, the system can dynamically track the position changes of the powered device and dynamically switch to the most suitable "optimal coil" and "optimal operating frequency," thereby achieving truly free-positioning charging and high-efficiency charging.

[0090] Please see Figures 1 to 3 This embodiment, based on the wireless charging control system provided in the previous embodiment, provides a wireless charging control method with multi-coil dynamic decoupling and frequency division driving. The hardware structure and connection relationships of the wireless charging control system are not detailed here; please refer to the description in the previous embodiment for more information.

[0091] like Figure 3 As shown, the wireless charging control method for multi-coil dynamic decoupling and frequency division driving provided in this embodiment includes the following steps:

[0092] S1: A frequency lookup table is pre-stored in the charging control module, and the frequency lookup table records the optimal operating frequency value corresponding to each coil;

[0093] S2: After system initialization, the charging control module controls N dynamic decoupling modules to disconnect the N electrical circuits from the power supply module to the N coils;

[0094] S3: The charging control module initiates the coil polling detection process: by controlling the corresponding dynamic decoupling module, the N electrical circuits are turned on one by one, and a Ping detection signal is sent;

[0095] S4: In the coil polling detection process, if the charging control module receives a feedback signal from a coil, it will analyze and obtain the corresponding coil coupling quality, and after completing a round of N-way electrical circuit detection starting with the electrical circuit corresponding to the coil, it will control N dynamic decoupling modules to disconnect the N-way electrical circuit.

[0096] S5: The charging control module compares the coil coupling quality of each coil obtained in the N-way electrical circuit detection in one round and obtains the optimal working coil;

[0097] S6: The charging control module first controls the dynamic decoupling module corresponding to the optimal working coil to make the corresponding electrical circuit conduct; then it configures the output frequency of the drive circuit module corresponding to the optimal working coil to the optimal working frequency value corresponding to the optimal working coil in the frequency lookup table.

[0098] In some specific implementations, it also includes:

[0099] S7: After the drive circuit module corresponding to the optimal working coil starts energy transmission at the optimal working frequency value, it starts monitoring and timing.

[0100] S8: After the monitoring time reaches the preset monitoring cycle, the corresponding electrical circuit is disconnected by controlling the dynamic decoupling module corresponding to the optimal working coil, and then the process returns to S3.

[0101] Here, by configuring a cyclic monitoring cycle for the coil polling detection process in the charging control module, the system can periodically restart the detection of the "best working coil" and dynamically switch the corresponding electrical circuit and operating frequency accordingly.

[0102] In some specific embodiments, the parsing to obtain the corresponding coil coupling quality in step S3 includes:

[0103] The charging control module parses the received feedback signal, obtains the Received Signal Strength Indication (RSSI) value, and uses it as the coil coupling quality of the coil.

[0104] Here, the Received Signal Strength Indication (RSSI) is used as the criterion for evaluating coil coupling quality. Correspondingly, the selection criterion for the optimal operating coil is: the coil with the highest RSSI. It can be understood that RSSI can reflect the signal strength at the receiving end (i.e., the power receiving device) in real time, providing an intuitive numerical indicator (e.g., -60dBm to -80dBm is a good range), facilitating the system's rapid determination of the coil's coupling status. Using RSSI as the coupling quality evaluation criterion offers advantages such as real-time performance, dynamic adaptability, and compatibility.

[0105] In this embodiment, the frequency lookup table preset in step S1 records the optimal operating frequency value for each coil, which refers to the frequency corresponding to the peak value of its Q value (quality factor of the coil). A high Q value means that the inductive reactance of the coil is much greater than its resistance at a specific frequency, resulting in strong energy storage capacity and low energy consumption. A higher Q value also means that the coil itself has less energy loss and can generate a stronger magnetic field, thereby achieving higher coupling efficiency and a longer transmission distance with the receiving coil of the power receiving device.

[0106] In this embodiment of the concentric nested coil structure, although the centers of the multiple coils coincide, the coils of different sizes have different inductances (L) and parasitic parameters. Therefore, the Q value of each coil, that is, the peak point of the frequency curve (i.e., the resonant frequency), will also be different. Generally, the smaller inner coil has a smaller inductance and its optimal resonant frequency may be higher (e.g., 150kHz); while the larger outer coil has a larger inductance and its optimal resonant frequency may be lower (e.g., 110kHz).

[0107] Therefore, in this embodiment, when a certain coil is selected as the optimal working coil, the charging control module controls the corresponding drive circuit module to work at the optimal frequency point corresponding to that coil, thereby maximizing the quality factor (Q value) of the coil and further improving the energy transmission efficiency.

[0108] In some specific implementations, the optimal operating frequency value corresponding to each coil in the frequency lookup table is specifically based on the formula Q=(2 The value is obtained by calculating f(L) / R, where Q is the quality factor of the coil, which is taken from the peak point of the coil's operating frequency curve; f is the optimal operating frequency of the coil; L is the inductance of the coil; and R is the equivalent series resistance of the coil.

[0109] In some other implementations, the optimal operating frequency value for each coil in the frequency lookup table is obtained through calibration. Specifically, the system will configure a calibration mode to determine and store the optimal operating frequency for each coil through scanning.

[0110] The wireless charging control method with dynamic decoupling and frequency division drive provided in this embodiment adopts a wireless charging control scheme that combines dynamic decoupling control strategy and frequency division drive strategy on a concentric nested multi-coil structure. It can solve the problems of energy loss and heat generation from the root, and achieve compatibility between charging efficiency and fault tolerance while ensuring free positioning function, thus significantly improving the energy transmission efficiency of the system.

[0111] In summary, the wireless charging control system and method with multi-coil dynamic decoupling and frequency division driving provided by the present invention have the following beneficial effects:

[0112] 1. By using a concentric nested coil layout, the most matching transmitting coil can be precisely located and powered according to the position of the receiving coil of the power receiving device, thereby achieving high coupling efficiency in the central area of ​​the charging plane and high fault tolerance in the edge area.

[0113] 2. By employing a dynamic decoupling strategy, the electrical circuit of the non-working coil is physically disconnected, fundamentally eliminating eddy current losses between coils, significantly improving system charging efficiency and reducing heat generation.

[0114] 3. By using a frequency division drive strategy, the working coil is made to operate at its highest efficiency point, maximizing the coil performance and achieving the maximum overall system efficiency.

[0115] 4. Through periodic polling detection and dynamic switching mechanism, the system can dynamically track the position changes of the receiving coil of the powered device, realizing true free positioning charging.

[0116] It should be noted that any reference signs placed between parentheses in the claims should not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The invention can be implemented by means of hardware comprising several different components and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names.

[0117] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the invention.

[0118] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

[0119] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0120] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0121] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0122] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0123] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A wireless charging control system with multi-coil dynamic decoupling and frequency division drive, characterized in that, include: The system includes a power supply module, a charging control module, a concentric nested coil group, N drive circuit modules, and N corresponding dynamic decoupling modules; the concentric nested coil group consists of N concentrically nested coils; N is an integer greater than 1. Each coil tap is connected to a drive circuit module via a dynamic decoupling module; each dynamic decoupling module is connected to the charging control module; each drive circuit module is connected to both the power supply module and the charging control module. The charging control module is configured to perform the following steps: S1: Pre-store a frequency lookup table, which records the optimal operating frequency value for each coil; S2: After system initialization, control N dynamic decoupling modules to disconnect the N electrical circuits from the power supply module to the N coils; S3: Start the coil polling detection process: By controlling the corresponding dynamic decoupling module, turn on the N electrical circuits one by one and send a Ping detection signal; S4: In the coil polling detection process, if a feedback signal of a coil is received, the corresponding coil coupling quality is parsed and obtained. After completing a round of N-way electrical circuit detection starting with the electrical circuit corresponding to the coil, the N dynamic decoupling modules are controlled to disconnect the N-way electrical circuit. S5: Compare the coil coupling quality of each coil obtained in the N-way electrical circuit detection to determine the optimal working coil; S6: First, control the dynamic decoupling module corresponding to the optimal working coil to make the corresponding electrical circuit conduct; then configure the output frequency of the drive circuit module corresponding to the optimal working coil to the optimal working frequency value corresponding to the optimal working coil in the frequency lookup table.

2. The wireless charging control system with multi-coil dynamic decoupling and frequency division drive as described in claim 1, characterized in that, The charging control module is also configured to perform the following steps: S7: After the drive circuit module corresponding to the optimal working coil starts energy transmission at the optimal working frequency value, it starts monitoring and timing. S8: After the monitoring time reaches the preset monitoring cycle, the corresponding electrical circuit is disconnected by controlling the dynamic decoupling module corresponding to the optimal working coil, and then the process returns to execute S3.

3. The wireless charging control system with multi-coil dynamic decoupling and frequency division drive as described in claim 1, characterized in that, The dynamic decoupling module includes a gate drive circuit, a switch QA, and a switch QB. The input terminal of the gate drive circuit is connected to the charging control module, and its output terminal is connected to two taps of the corresponding coil via the switch QA and the switch QB, respectively. The switch QA and the switch QB are also connected to the output terminal of the corresponding drive circuit module, respectively.

4. The wireless charging control system with multi-coil dynamic decoupling and frequency division drive as described in claim 3, characterized in that, The charging control module includes multiple GPIOs; the gate drive circuits of the N dynamic decoupling modules are connected to the multiple GPIOs.

5. The wireless charging control system with multi-coil dynamic decoupling and frequency division drive as described in claim 3, characterized in that, The switching transistors QA and QB are one of the following: MOSFET, transistor, thyristor, IGBT, or relay.

6. The wireless charging control system with multi-coil dynamic decoupling and frequency division drive as described in claim 1, characterized in that, The concentric nested coil group is composed of an inner coil, a middle coil, and an outer coil nested concentrically; the inductance of the inner coil is 2.0 μH; the inductance of the middle coil is 4.7 μH; and the inductance of the outer coil is 8.2 μH.

7. A wireless charging control method with multi-coil dynamic decoupling and frequency division drive, characterized in that, include: The system comprises a power supply module, a charging control module, a concentric nested coil group, N driving circuit modules, and N corresponding dynamic decoupling modules; the concentric nested coil group consists of N coils nested concentrically; N is an integer greater than 1; the tap of each coil is connected to a driving circuit module via a dynamic decoupling module; each dynamic decoupling module is connected to the charging control module; each driving circuit module is connected to both the power supply module and the charging control module. S1: A frequency lookup table is pre-stored in the charging control module, and the frequency lookup table records the optimal operating frequency value corresponding to each coil; S2: After system initialization, the charging control module controls N dynamic decoupling modules to disconnect the N electrical circuits from the power supply module to the N coils; S3: The charging control module initiates the coil polling detection process: by controlling the corresponding dynamic decoupling module, the N electrical circuits are turned on one by one, and a Ping detection signal is sent; S4: In the coil polling detection process, if the charging control module receives a feedback signal from a coil, it will analyze and obtain the corresponding coil coupling quality, and after completing a round of N-way electrical circuit detection starting with the electrical circuit corresponding to the coil, it will control N dynamic decoupling modules to disconnect the N-way electrical circuit. S5: The charging control module compares the coil coupling quality of each coil obtained in the N-way electrical circuit detection in one round and obtains the optimal working coil; S6: The charging control module first controls the dynamic decoupling module corresponding to the optimal working coil to make the corresponding electrical circuit conduct; then it configures the output frequency of the drive circuit module corresponding to the optimal working coil to the optimal working frequency value corresponding to the optimal working coil in the frequency lookup table.

8. The wireless charging control method for multi-coil dynamic decoupling and frequency division driving as described in claim 7, characterized in that, Also includes: S7: After the drive circuit module corresponding to the optimal working coil starts energy transmission at the optimal working frequency value, it starts monitoring and timing. S8: After the monitoring time reaches the preset monitoring cycle, the corresponding electrical circuit is disconnected by controlling the dynamic decoupling module corresponding to the optimal working coil, and then the process returns to S3.

9. The wireless charging control method for multi-coil dynamic decoupling and frequency division driving as described in claim 7, characterized in that, The analysis in S3 to obtain the corresponding coil coupling quality includes: The received feedback signal is analyzed to obtain the Received Signal Strength Indication (RSSI) value, which is then used as the coil coupling quality of the coil.

10. The wireless charging control method for multi-coil dynamic decoupling and frequency division driving as described in claim 7, characterized in that, The optimal operating frequency value corresponding to each coil in the frequency lookup table is calculated according to the formula Q=(2πfL) / R; where Q is the quality factor of the coil, which is taken from the peak point of the coil's operating frequency curve; f is the optimal operating frequency of the coil; L is the inductance of the coil; and R is the equivalent series resistance of the coil.

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