Wireless charging energy signal cooperative transmission system and method based on topological multiplexing

Abstract

The invention discloses a wireless charging energy signal cooperative transmission system and method based on topological multiplexing, and the system comprises a source end power circuit, a resonant coupling circuit, a detection circuit and a signal coding circuit, and the signal coding circuit transmits charging information to a source end through the resonant coupling circuit. The source end power supply circuit charges a load through the resonant coupling circuit, the resonant coupling circuit comprises a transmitting end and a receiving end, and the detection circuit is used for decoding and switching the source end power supply circuit to a specified charging state according to identified charging information. According to the invention, the problems of system complexity improvement and energy efficiency reduction caused by introduction of additional modules in a traditional Bluetooth communication mechanism can be overcome, zero-power-consumption interaction of charging demand information is realized, and the contradiction between multi-device differential energy supply and efficient communication in a complex scene is solved.

Description

Technical Field

[0001] The present invention relates to a wireless power transmission device and method, and in particular to a wireless charging energy signal coordinated transmission system and method based on topology multiplexing. Background Art

[0002] Wireless charging technology has achieved widespread adoption in consumer electronics, but it faces significant challenges in scenarios involving the simultaneous charging of multiple devices. Due to significant differences in power requirements, charging protocols, and electrical parameters among various power-consuming devices, traditional single-topology charging systems struggle to meet the demands of coordinated charging across multiple devices. Consequently, there is an urgent need for intelligent charging systems with dynamic configuration capabilities.

[0003] Current mainstream charging management strategies are mostly based on battery state of charge (SOC) monitoring or input impedance detection technology. However, these methods have inherent limitations: first, the load side cannot effectively transmit multi-dimensional charging parameters (such as device type and maximum power capacity); second, the source side struggles to accurately interpret the device's real-time demand status. This directly results in the charging system being unable to establish a precise power matching mechanism, affecting charging efficiency and posing safety risks.

[0004] Establishing a source-load collaborative communication mechanism can effectively address these issues. By establishing a dedicated information channel to enable real-time interaction between device characteristic parameters and source-side configuration parameters, protocol handshakes and parameter calibration can be completed during the charging initialization phase, enabling dynamic power allocation and charging strategy optimization. This two-way communication architecture not only significantly improves system compatibility but also mitigates energy loss during charging through pre-configuration mechanisms.

[0005] Existing communication enhancement solutions include integrating wireless modules such as Bluetooth and Wi-Fi to establish source-charge information exchange, but these solutions have two key drawbacks: First, the integration of RF modules increases system hardware complexity, significantly increasing bill of materials (BOM) costs and the probability of failure; second, the continuous operation of wireless communications generates additional power consumption, resulting in a decrease in overall system energy efficiency. These technical contradictions are particularly prominent in compact charging devices, severely hindering the practical application of multi-device intelligent charging systems. Summary of the Invention

[0006] Purpose of the invention: The purpose of the present invention is to provide a source-load communication channel that does not generate additional energy consumption, so as to simplify the system design while reducing unnecessary energy waste and further improve the overall efficiency of the charging system based on topological multiplexing wireless charging energy signal collaborative transmission system.

[0007] Technical solution: The present invention discloses a wireless charging energy signal collaborative transmission system based on topological multiplexing, including a source power supply circuit, a resonant coupling circuit, an envelope detection circuit, a load battery charging circuit, a signal encoding circuit, and a load battery. The signal encoding circuit sends charging information to the source end through the resonant coupling circuit. The envelope detection circuit is used to decode and switch the source power supply circuit to a specified charging state based on the identified charging information. The source power supply circuit charges the load battery charging circuit through the resonant coupling circuit. The load battery charging circuit is used to charge the load battery.

[0008] The state of the source power supply circuit, the resonant coupling circuit and the envelope detection circuit is switched through a single-pole double-throw switch S1. The common end of the single-pole double-throw switch S1 is connected to the resonant coupling circuit, and the normally open contact and the normally closed contact are connected to the source power supply circuit and the resonant coupling circuit respectively; the state of the resonant coupling circuit and the load battery charging circuit is switched through a normally closed switch S4, and the state of the resonant coupling circuit and the signal encoding circuit is switched through a normally open switch S3. The state of the signal encoding circuit, the load battery charging circuit and the load battery is switched through a single-pole double-throw switch S2. The common end of the single-pole double-throw switch S2 is connected to the load battery, and the normally open contact and the normally closed contact are connected to the signal encoding circuit and the load battery charging circuit respectively.

[0009] Optionally, two N-channel enhancement-mode MOS transistors are connected in series to form a normally closed switch S4, two N-channel depletion-mode MOS transistors are connected in series to form a normally open switch S3, and a normally closed switch consisting of two series-connected N-channel enhancement-mode MOS transistors and a normally open switch consisting of two series-connected N-channel depletion-mode MOS transistors are connected in parallel to form single-pole double-throw switches S1 and S2.

[0010] Optionally, the source end power supply circuit includes a digital controlled DC power supply U in , DC filter capacitor C ft And the source-side inverter circuit composed of four N-channel enhancement mode MOS tubes (D1-D4), DC filter capacitor C ft Connect in parallel to the CNC DC power supply U in Both ends are connected in parallel with the input end of the source inverter circuit.

[0011] Optionally, the envelope detection circuit includes a diode D B , detection capacitor C B And the detection resistor R B , the source MCU decoder according to R B The voltages at both ends are decoded and information is identified.

[0012] Optionally, the resonant coupling circuit includes a transmitting end and a receiving end, and the transmitting end is composed of a transmitting coil L t and the transmitter resonant capacitor C t The receiving end consists of a receiving coil Lr and the receiving end resonant capacitor C r composition.

[0013] Optionally, the signal encoding circuit includes a load-end inverter circuit composed of four N-channel enhancement mode MOS transistors (D5-D8), an encoding filter capacitor C ft2 And the normally open switch S3, the secondary end MCU encoder provides a 0-1 signal to the normally open switch S3 to control the switch to open and close to generate a continuous signal.

[0014] Optionally, one output end of the source-end power supply circuit is connected to an input end of the transmitting end of the resonant coupling circuit, and is also connected to an input end of the envelope detection circuit. The other output end of the source-end power supply circuit is connected to the normally open contact 1 of the single-pole double-throw switch S1, the other input end of the transmitting end of the resonant coupling circuit is connected to the common end COM1 of the single-pole double-throw switch S1, and the other input end of the envelope detection circuit is connected to the normally closed contact 1' of the single-pole double-throw switch S1.

[0015] Optionally, the positive terminal of the load battery and the encoding filter capacitor C in the signal encoding circuit ft2 One end is connected to the negative end and the common end COM2 of the single-pole double-throw switch S2 is connected to the coding filter capacitor C in the signal coding circuit. ft2 The other end is connected to the normally open contact 2' point of the single-pole double-throw switch S2; an output end of the receiving end of the resonant coupling circuit is connected to an input end of the signal encoding circuit, and is also connected to one end 4' of the normally closed switch S4. The other output end of the receiving end of the resonant coupling circuit is connected to the other input end of the signal encoding circuit, and is also connected to an input end of the load battery charging circuit. The other input end of the load battery charging circuit is connected to the other 4' point of the normally closed contact switch S4; one end of the rectifier and filter capacitor in the load battery charging circuit is connected to the positive terminal of the load battery, and the other end is connected to the normally closed contact 2' point of the single-pole double-throw switch S2.

[0016] The method for coordinated transmission of wireless charging energy signals based on topological multiplexing of the present invention adopts the system described above and includes the following steps:

[0017] S1, initial detection standby state: In the initial state, the action signals G1, G2, G3, and G4 of switches S1, S2, S3, and S4 are all low. At this time: the normally closed contact 1' of switch S1 is connected to COM1, the transmitting platform is in the detection state, and the energy inverter is partially disconnected; the normally closed contact 2 of switch S2 is connected to COM2, the load battery is in the charging state, and the signal inverter is partially disconnected; the connection between point 3 on one end of the normally open switch S3 and point 3' on the other end is disconnected, and the connection between point 4 on one end of the normally closed switch S4 and point 4' on the other end is connected, and there is no energy flow between the platform and the load battery;

[0018] S2. Load-triggered pre-charge test: When the load is placed above the launch platform, the launch platform detects the presence of an object above, triggering the normally open contact 1 of switch S1 to be connected to the common terminal COM1, and the launch platform briefly switches to the energy transfer state to pre-charge the load. If the launch platform does not detect the presence of an object above, it returns to step S1.

[0019] S3. Load self-test and mode decision: When the system equivalent circuit switches to the energy transmission-waiting-for-charging state, the transmitting platform supplies power to the load and determines whether the load detects energy input. If the load detects energy input, the platform completes pre-charging and switches to the detection state, and the system equivalent circuit is in the detection-waiting-for-charging state. If the load does not detect energy input, the process returns to step S1. At this point, there should be no energy input on the load side, and it is again determined whether the load detects energy input. If the load detects energy input, the platform completes pre-charging and switches to the detection state again until there is no energy input to the load. If there is no energy input to the load, the platform switches to the signal transmission state, transmits device status information to the platform, and the system equivalent circuit is in the detection-signal transmission state.

[0020] S4, multiplexing communication transmission: When the system switches to the detection-signal transmission state, the load controls the on / off between point 3 on one end and point 3' on the other end of switch S3 according to the device information code, generating a 0-1 signal. The platform-side detection circuit receives and demodulates the load information. When the platform detects a signal input, it receives and identifies the device information and starts signal transmission. If the platform does not detect a signal input, it switches the equivalent circuit back to the signal transmission state. After signal transmission is started, the platform continuously detects the signal input. If there is a signal input, the platform continuously receives and identifies the device information. If there is no signal input, it determines that the information has been sent.

[0021] S5, Adaptive charging mode switching: When the status information is sent, the load switches back to the waiting state. The platform side identifies the load information and switches to the charging topology and power mode required by the load. The system returns to the energy transmission-waiting state and starts charging.

[0022] Furthermore, in the wireless charging energy signal collaborative transmission method, the encoding rules are collaboratively designed based on the hierarchical redundant source encoding module, the structured data encapsulation module and the energy signal topology multiplexing execution module. The hierarchical redundant source encoding module performs single-bit triple redundant encoding on conventional binary signals and realizes anti-interference error correction through the majority decision mechanism. At the same time, it performs overall three-times repeated encoding on the key termination signal to form a bit pattern that is distinguished from the conventional redundant encoding; the structured data encapsulation module generates a binary sequence including a device identity field, a charging request field and a status control field, wherein the device identity field is composed of a fixed synchronization code, a device type code, a device serial number and a fixed check code 0101, the charging request field includes the maximum charging power, the integer part of the charging voltage and the decimal part of the charging voltage, and the status control field includes the pre-charging efficiency status, the charging mode and the signal termination code 0110 or the emergency termination code 1001.

[0023] Beneficial effects: Compared with the existing technology, the significant technical effects of the present invention are as follows: (1) In response to the problems of hardware redundancy and low energy efficiency in traditional systems, a dual-channel dynamic multiplexing architecture is proposed. Through time-sharing multiplexing of energy-signal topology, a single inverter is used to time-share the energy transmission and signal communication functions; (2) In response to the problems of high power consumption and poor anti-interference of external communication modules, a passive load intelligent communication signal is designed, and the "0-1" coding signal is generated by load-side impedance modulation, and the platform side analyzes the information through the detection circuit; (3) The device coding signal is embedded in the energy transmission gap, and the envelope detection is used to analyze the demand. The communication takes up zero time, realizes "senseless" information interaction, improves coding efficiency, and adapts to complex MIMO scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 An equivalent circuit diagram of the transmission system provided in this embodiment;

[0025] Figure 2 Flowchart of the transmission system provided in this embodiment;

[0026] Figure 3 The operating state diagram of the transmission system provided in this embodiment, wherein (a) is the detection-waiting-for-charging state, (b) is the energy transmission-waiting-for-charging state, and (c) is the detection-signal transmission state;

[0027] Figure 4 Schematic diagram of the coding structure in this embodiment;

[0028] Figure 5 An experimental prototype of the transmission system provided in this embodiment;

[0029] Figure 6The oscilloscope waveforms and serial port output results of the signal transmission results of the transmission system experiment provided in this embodiment, where (a) is a 0110 drone and (b) is a 1011 tablet computer. DETAILED DESCRIPTION

[0030] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. The accompanying drawings are for illustrative purposes only and should not be construed as limiting the present invention. In order to better illustrate the present embodiment, some parts of the accompanying drawings may be omitted, enlarged, or reduced, and do not represent the dimensions of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted. The same or similar reference numerals correspond to the same or similar parts. Other different forms of changes or modifications can also be made based on the following description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

[0031] In response to the problems of increased system complexity and decreased energy efficiency due to the introduction of additional modules in traditional Bluetooth communication mechanisms, this invention establishes a passive energy-communication collaborative transmission mechanism based on topology reuse, realizes zero-power interaction of charging demand information, and resolves the contradiction between differentiated energy supply and efficient communication for multiple devices in complex scenarios.

[0032] like Figure 1 As shown, the present invention describes a wireless charging energy signal collaborative transmission system based on topological multiplexing, including several main parts: a source power supply circuit, a resonant coupling circuit, an envelope detection circuit, a load battery charging circuit, a signal encoding circuit and a load battery BAT. The signal encoding circuit sends charging information to the source end through the resonant coupling circuit, the envelope detection circuit is used to decode and switch the source power supply circuit to a specified charging state according to the recognized charging information, the source power supply circuit charges the load battery charging circuit through the resonant coupling circuit, and the load battery charging circuit is used to charge the load battery BAT.

[0033] Optionally, two N-channel enhancement-mode MOS transistors are connected in series to form a normally closed switch S4, two N-channel depletion-mode MOS transistors are connected in series to form a normally open switch S3, the normally closed switches consisting of two series-connected N-channel enhancement-mode MOS transistors are connected in parallel to form a single-pole double-throw switch S1, and the normally open switches consisting of two series-connected N-channel depletion-mode MOS transistors are connected in parallel to form a single-pole double-throw switch S2.

[0034] The source power supply circuit includes a digital controlled DC power supply U in , DC filter capacitor C ft And the source-side inverter circuit composed of four N-channel enhancement mode MOS tubes (D1-D4), DC filter capacitor C ft Connect in parallel to the CNC DC power supply Uin The envelope detection circuit includes a diode D B , detection capacitor C B And the detection resistor R B , diode D B The positive electrode is connected to the output end of the inverter circuit, and the detection capacitor C B And the detection resistor R B Connect in parallel with diode D B Between the negative pole and the normally closed contact 1' of the single-pole double-throw switch S1. The source end MCU decoder is based on the detection resistor R B The voltage at both ends is decoded and information is recognized. The resonant coupling circuit includes a transmitter and a receiver. The transmitter consists of a transmitting coil L t and the transmitter resonant capacitor C t The receiving end consists of a receiving coil L r and the receiving end resonant capacitor C r The signal coding circuit includes a load-end inverter circuit composed of four N-channel enhancement MOS tubes (D5-D8), a coding filter capacitor C fr2 The secondary MCU encoder provides a 0-1 signal to the normally open switch S3 to control the normally open switch S3 to open and close to generate a continuous signal. The load battery charging circuit includes four diodes (D9-D 12 ) composed of a rectifier circuit and a rectifier filter capacitor C fr1 One output terminal of the source-end power supply circuit is connected to one input terminal of the transmitting terminal of the resonant coupling circuit, and is also connected to one input terminal of the envelope detection circuit. The other output terminal of the source-end power supply circuit is connected to the normally open contact 1 of the single-pole double-throw switch S1. The other input terminal of the transmitting terminal of the resonant coupling circuit is connected to the common terminal COM1 of the single-pole double-throw switch S1. The other input terminal of the envelope detection circuit is connected to the normally closed contact 1' of the single-pole double-throw switch S1.

[0035] The positive terminal of the load battery BAT and the encoding filter capacitor C in the signal encoding circuit fr2 One end is connected to the negative end and the common end COM2 of the single-pole double-throw switch S2 is connected to the coding filter capacitor C in the signal coding circuit. fr2The other end is connected to the normally open contact 2' point of the single-pole double-throw switch S2; an output end of the receiving end of the resonant coupling circuit is connected to an input end of the signal encoding circuit, and is also connected to one end 4' of the normally closed switch S4. The other output end of the receiving end of the resonant coupling circuit is connected to the other input end of the signal encoding circuit, and is also connected to an input end of the load battery charging circuit. The other input end of the load battery charging circuit is connected to the other end 4' point of the normally closed contact switch S4; one end of the rectifier and filter capacitor in the load battery charging circuit is connected to the positive terminal of the load battery BAT, and the other end is connected to the normally closed contact 2' point of the single-pole double-throw switch S2.

[0036] Based on the same inventive concept, Figure 2 As shown, the present invention also provides an energy signal cooperative transmission method using the wireless charging energy signal cooperative transmission system based on topology multiplexing, comprising the following steps:

[0037] S1, initial detection standby state: In the initial state, the action signals G1, G2, G3, and G4 of switches S1, S2, S3, and S4 are all low levels. At this time: the normally closed contact 1' of switch S1 is connected to the common terminal COM1, the transmitting platform is in the detection state, and the source end power supply circuit is partially disconnected to reduce energy loss; the normally closed contact 2 of switch S2 is connected to the common terminal COM2, the load battery BAT is in the charging state, and the signal encoding circuit is partially disconnected; the normally open switch S3 is disconnected from the other end 3', and the normally closed switch S4 is connected from the other end 4'. The system equivalent circuit is as follows: Figure 3 As shown in (a), there is no energy flow between the launch platform and the load battery BAT.

[0038] S2. Load trigger pre-charge test: When the load is placed above the launch platform, the launch platform detects that there is an object above it, triggering the normally open contact 1 of switch S1 to be connected to the common terminal COM1, and the launch platform briefly switches to the energy transmission state to pre-charge the load. The system equivalent circuit is as follows: Figure 3 When the launch platform does not detect any object above it, the process returns to step S1.

[0039] S3, load self-test and mode decision: When the system equivalent circuit switches to Figure 3 In the structure shown in (b), the transmitting platform supplies power to the load and determines whether the load detects energy input. When the load detects energy input, the platform completes pre-charging and switches to the detection state. The system equivalent circuit is shown as follows: Figure 3As shown in (a); if the load does not detect energy input, then return to step S1. At this time, there should be no energy input on the load side, and it is judged again whether the load detects energy input. If the load detects energy input, after the platform completes pre-charging, the platform switches to the detection state again until there is no energy input to the load. When there is no energy input to the load, it switches to the signal transmission state and transmits the device status information to the platform. The system equivalent circuit is as follows Figure 3 As shown in (c).

[0040] S4, multiplexing communication transmission: When the system switches to Figure 3 In the detection-signal transmission state shown in (c), the load controls the on / off state between point 3 on one end and point 3' on the other end of switch S3 based on the device information encoding, generating a 0-1 signal. The platform-side detection circuit receives and demodulates the load information. When the platform detects a signal input, it receives and identifies the device information, indicating that signal transmission is enabled. If no signal input is detected, the equivalent circuit is switched back to the signal transmission state. Once signal transmission is enabled, the platform continuously detects signal input. If there is a signal input, the platform continuously receives and identifies device information. If there is no signal input, the platform determines that the information has been sent.

[0041] S5, adaptive charging mode switching: After the status information is sent, the load switches back to the waiting state. The platform side identifies the load information and switches to the charging topology and power mode required by the load. The system returns to the energy transmission-waiting state and starts charging. The system equivalent circuit is as follows: Figure 3 As shown in (b).

[0042] Taking into account the low power consumption, high efficiency and stability requirements of energy transmission, the complex encoding and decoding processes and high power consumption characteristics of traditional communication solutions are not applicable in scenarios where wireless power transmission is used to perform data transmission functions. In response to the core requirements of 0-1 binary instruction transmission (such as charging start and stop control, charging status information transmission, etc.), a minimalist communication architecture is adopted to achieve signal transmission by reusing the energy transmission topology, which significantly reduces system complexity and hardware costs while ensuring anti-interference capabilities. It includes the collaborative design of a hierarchical redundant signal source coding module, a structured data encapsulation module and an energy topology multiplexing execution module. The hierarchical redundant signal source coding module performs single-bit triple redundant encoding on conventional binary signals and implements anti-interference error correction through a majority decision mechanism. At the same time, it performs three-fold repetition encoding on the key termination signal to form a bit pattern that is distinguishable from conventional redundant encoding; the structured data encapsulation module generates a binary sequence containing a device identity field, a charging request field and a status control field. The device identification field consists of a fixed synchronization code (4 bits), a device type code (3 bits), a device serial number (4 bits) and a fixed check code 0101 (4 bits). The charging request field contains the maximum charging power (8 bits, 0-255W), the integer part of the charging voltage (5 bits, 0-31V) and the decimal part of the charging voltage (4 bits, 0.0-0.9V). The status control field includes the pre-charge efficiency state (2 bits: 00 Invalid / 01State1 / 10State2 / 11State3), the charging mode (2 bits: 00CC / 01CV / 10CC-CV / 11CP) and the signal termination code 0110 or the emergency termination code 1001 (4 bits).

[0043] Signal transmission typically involves source coding, modulation, demodulation, and decoding. Source coding essentially uses specific rules to convert raw information into a coded form suitable for channel transmission. In traditional communications, the core goal of source coding is to improve transmission efficiency by eliminating data redundancy. However, in wireless power transmission, the design objectives of source coding change significantly: electromagnetic coupling channels are subject to high-frequency harmonic interference and random fluctuations in the energy field, which directly lead to increased signal error rates. Therefore, the coding strategy needs to be redefined.

[0044] Because command transmission scenarios (such as switch control and status feedback) require low data volumes and high real-time performance, their signals are in the form of 0-1 binary sequences. In these scenarios, the design goals of source coding shift from traditional data compression to enhanced reliability and system simplification, enhancing the signal's anti-interference capabilities through coding rules. To ensure efficient power supply for a variety of electrical devices, various source information must be considered when considering source coding:

[0045] (1) Device identity, used for device identification and signal synchronization, with a total length of 15 bits, including the device synchronization code (the starting position of the synchronization signal transmission), the device type (including information such as mobile phone, headphones, computer, watch, etc.), the device serial number, and the device verification code (which assists the device synchronization code in achieving accurate signal positioning). In this example, the device synchronization code is 1010, the device verification code is 0101, the number of device types is set to 8, and the number of device serial numbers is set to 16. The device identity structure is shown in Table 1.

[0046] Table 1 Equipment identification code

[0047]

[0048] (2) Charging information request, used to transmit power and voltage requirements, with a total length of 17 bits. In this example, the charging power of the power-consuming device is required to be below 255W and the charging voltage is required to be no more than 31.9V. The charging information request structure is shown in Table 2.

[0049] Table 2 Charging information request code

[0050]

[0051] (3) Pre-charge efficiency and charging mode, used for state feedback and mode selection, with a total length of 4 bits. In this example, the battery state indicated by 01 is marked as State 1, 10 indicates State 2, and 11 indicates State 3. 00 indicates no valid data and charging is forced to stop. The charging mode code is used to select the corresponding charging mode according to the device requirements. In this example, the CC mode code is 00, the CV mode code is 01, the CC-CV mode code is 10, and the CP mode code is 11. The pre-charge efficiency and charging mode code structure is shown in Table 3.

[0052] Table 3 Pre-charge efficiency and charging mode code

[0053]

[0054] (4) Signal termination and emergency termination, used to end communication or emergency interruption, with a total length of 4 bits. When the device completes sending the information, it will output the signal termination code 0110. When the platform recognizes the signal termination code, it will switch to the charging state and start charging the device according to the charging information by switching to the corresponding charging topology. When a fault such as overheating or foreign object interference occurs during the pre-charging process, the signal termination code is converted to the emergency termination code 1001. At this time, the platform will immediately disconnect the charging of the device. The structure of the signal termination and emergency termination code is shown in Table 4.

[0055] Table 4 Signal termination and emergency termination codes

[0056]

[0057] Based on the above encoding rules, this example sets the device type and its corresponding charging power range and charging voltage range, etc., as shown in Table 5.

[0058] Table 5 Equipment information

[0059]

[0060] In summary, the source code can be formulated according to the device information. For example, a drone with serial number 0110 requests a charging power of 120W, a standard charging voltage of 24V, a pre-charge state of State 1, and uses CP mode. The corresponding coding structure is as follows: Figure 4 shown.

[0061] To address signal misjudgment caused by electromagnetic interference, a hierarchical repetitive coding strategy is adopted: conventional binary signals (0 / 1) use single-bit triple redundant coding (0→000, 1→111), and the majority decision mechanism is used to improve error correction capabilities in noisy environments. For the critical termination signal (0110), an overall three-repetitive structure (0110→011001100110) is designed. Through differentiated coding rules, the termination signal is strictly distinguished from the bit pattern of conventional redundant coding, ensuring correct identification by the system. Correspondingly, the source coding of the 0110 drone is expanded to:

[0062] 111000111000 | 111000111 | 000111111000 | 000111000111 | 000111111111111000000000 | 111111000000000 | 000000000000 | 000111 | 111111 | 011001100110 , a total of 120 bits.

[0063] This example proposes an energy-signal topology multiplexing strategy based on on-off modulation. Its core is to directly map binary signal source codes into timing control signals for high- and low-voltage energy packets through a complementary combination of enhancement-mode and depletion-mode N-channel MOSFETs. The performance of this strategy is strictly limited by the interaction between device physical characteristics and system operating conditions, requiring collaborative design based on the following three types of coupling constraints:

[0064] (1) Switch delay matching → ensure signal continuity;

[0065] MOSFET turn-on delay t d(on) and turn-off delay t d(off) It will cause the pulse rising edge / falling edge distortion. If the single bit signal duration T bitInsufficient will cause pulse edge overlap and cause inter-symbol crosstalk. bit Need to consider t d(on) , t d(off) , rise time t r , fall time t f and pulse width t w And it is necessary to ensure that the above parameters of different MOSFETs are similar to enhance system stability.

[0066] (2) Voltage-resistant redundant design → ensuring system reliability;

[0067] When the drain-source voltage V DS If the device rating is exceeded, the MOSFET will experience avalanche breakdown, causing permanent damage. The system's maximum voltage is set at 31.9V. Considering the presence of ripple, the peak voltage may reach over 41.5V. The voltage margin needs to be increased to suppress voltage spikes caused by sudden load changes or resonant circuit resonance, ensuring the device's safety margin under transient shocks.

[0068] (3) Scene packaging optimization → balance performance and space utilization;

[0069] Although large package devices (such as TO-220) have advantages such as strong heat dissipation, high voltage resistance, and low on-resistance, they occupy a large board area (about 80mm 2 ), which conflicts with the high-density integration requirements of desktop devices. DS Under the premise of keeping the safety threshold and on-resistance as small as possible, compact packages such as SOT-23 are preferred, which can reduce the board area by sacrificing some heat dissipation capacity (approximately 12mm). 2 ), and use the PCB copper layer to assist in heat dissipation to maintain the temperature rise (ΔT≤25℃).

[0070] Under the premise of comprehensively considering the above three constraints, the selection results of the switch device and some key parameters of this example are shown in Table 6. As can be seen from the table, for the enhancement mode MOSFET selected in this example, the total turn-on time t on =t d(on) +t r =11.7ns, total off time t off =t d(off) +t f =11ns, the total switching time is 22.7ns; for the depletion-mode MOSFET used in this example, the total turn-on time t on =t d(on) +t r =7.5ns, total off time t off =t d(off) +t f=18ns, and the total switching time is 25.5ns. To ensure accurate signal transmission, the duration of a single-bit signal is set to 1ms. Theoretically, the source code can be transmitted within 120ms.

[0071] Table 6 Some key parameters of switching devices

[0072]

[0073] This example uses envelope detection for signal demodulation. Envelope detection is a non-coherent demodulation method that extracts baseband signals from amplitude modulated signals. Its core is to restore the envelope of the modulated signal through rectification and filtering.

[0074] In order to verify the feasibility of the topology reuse strategy, a Figure 5 The experimental prototype shown in the figure consists of a digitally controlled adjustable DC input, an inverter circuit, a signal encoder and decoder, an envelope detection circuit, an oscilloscope, a device to be charged, and a MIMO WPT platform. The charging equipment includes a modified 0110 drone and a 1011 tablet computer simulated load. According to the coding rules set in this example, the device parameters and corresponding codes of the two devices are shown in Table 7.

[0075] In order to charge two devices at the same time, the encoding information of the devices needs to be exchanged first. Through the topological multiplexing strategy proposed in this example, the accurate reading and rapid switching of device information can be achieved. In order to verify the accuracy of the encoding transmission of different devices, the transmission and decoding of the signal waveform are verified by oscilloscope measurement and serial port reading. The specific results are as follows: Figure 6 As shown in (a) and (b). sig The measured waveform is the signal sent by the encoding end, U C is the envelope signal, U DR is the envelope circuit input signal, U O is the output voltage, I O is the output current.

[0076] Table 7 Equipment parameters and coding

[0077]

[0078] Experimental results demonstrate that the proposed energy-to-signal topology reuse method can accurately and quickly locate charging device information and achieve rapid response to specified charging modes and parameters. By specifying power, combined with partitioned operation of the transmitting coil and flexible load positioning, it enables flexible power allocation and autonomous charging mode selection in multi-load scenarios.

Claims

1. A wireless charging energy signal cooperative transmission system based on topological multiplexing, characterized in that: The system includes a source-end power supply circuit, a resonant coupling circuit, an envelope detection circuit, a load battery charging circuit, a signal encoding circuit, and a load battery. The signal encoding circuit sends charging information to the source end through the resonant coupling circuit. The envelope detection circuit is used to decode and switch the source-end power supply circuit to a specified charging state according to the identified charging information. The source-end power supply circuit charges the load battery charging circuit through the resonant coupling circuit. The load battery charging circuit is used to charge the load battery. The state of the source power supply circuit, the resonant coupling circuit and the envelope detection circuit is switched through a single-pole double-throw switch S1. The common end of the single-pole double-throw switch S1 is connected to the resonant coupling circuit, and the normally open contact and the normally closed contact are connected to the source power supply circuit and the resonant coupling circuit respectively; the state of the resonant coupling circuit and the load battery charging circuit is switched through a normally closed switch S4, and the state of the resonant coupling circuit and the signal encoding circuit is switched through a normally open switch S3. The state of the signal encoding circuit, the load battery charging circuit and the load battery is switched through a single-pole double-throw switch S2. The common end of the single-pole double-throw switch S2 is connected to the load battery, and the normally open contact and the normally closed contact are connected to the signal encoding circuit and the load battery charging circuit respectively.

2. The wireless charging energy signal cooperative transmission system based on topological multiplexing according to claim 1 is characterized in that: Two N-channel enhancement-mode MOS transistors are connected in series to form a normally closed switch S4, two N-channel depletion-mode MOS transistors are connected in series to form a normally open switch S3, and single-pole double-throw switches S1 and S2 are connected in parallel to form a normally closed switch consisting of two series-connected N-channel enhancement-mode MOS transistors and a normally open switch consisting of two series-connected N-channel depletion-mode MOS transistors.

3. The wireless charging energy signal coordinated transmission system based on topological multiplexing according to claim 1 is characterized in that: The source power supply circuit includes a digital controlled DC power supply U in , DC filter capacitor C ft And the source-side inverter circuit composed of four N-channel enhancement mode MOS tubes (D1-D4), DC filter capacitor C ft Connect in parallel to the CNC DC power supply U in Both ends are connected in parallel with the input end of the source inverter circuit.

4. The wireless charging energy signal coordinated transmission system based on topological multiplexing according to claim 1 is characterized in that: The envelope detection circuit includes a diode D B , detection capacitor C B And the detection resistor R B , the source MCU decoder according to R B The voltages at both ends are decoded and information is identified.

5. The wireless charging energy signal coordinated transmission system based on topology multiplexing according to claim 1 is characterized in that: The resonant coupling circuit includes a transmitting end and a receiving end. The transmitting end is composed of a transmitting coil L t and the transmitter resonant capacitor C t The receiving end consists of a receiving coil L r and the receiving end resonant capacitor C r composition.

6. The wireless charging energy signal coordinated transmission system based on topology multiplexing according to claim 1 is characterized in that: The signal encoding circuit includes a load-end inverter circuit composed of four N-channel enhancement MOS tubes (D5-D8), an encoding filter capacitor C ft2 And the normally open switch S3, the secondary end MCU encoder provides a 0-1 signal to the normally open switch S3 to control the switch to open and close to generate a continuous signal.

7. The wireless charging energy signal coordinated transmission system based on topology multiplexing according to claim 1 is characterized in that: One output end of the source-end power supply circuit is connected to an input end of the transmitting end of the resonant coupling circuit, and is also connected to an input end of the envelope detection circuit. The other output end of the source-end power supply circuit is connected to the normally open contact 1 of the single-pole double-throw switch S1. The other input end of the transmitting end of the resonant coupling circuit is connected to the common terminal COM1 of the single-pole double-throw switch S1. The other input end of the envelope detection circuit is connected to the normally closed contact 1' of the single-pole double-throw switch S1.

8. The wireless charging energy signal coordinated transmission system based on topology multiplexing according to claim 1 is characterized in that: The positive terminal of the load battery and the encoding filter capacitor C in the signal encoding circuit ft2 One end is connected to the negative end and the common end COM2 of the single-pole double-throw switch S2 is connected to the coding filter capacitor C in the signal coding circuit. ft2 The other end is connected to the normally open contact 2' point of the single-pole double-throw switch S2; an output end of the receiving end of the resonant coupling circuit is connected to an input end of the signal encoding circuit, and is also connected to one end 4' of the normally closed switch S4. The other output end of the receiving end of the resonant coupling circuit is connected to the other input end of the signal encoding circuit, and is also connected to an input end of the load battery charging circuit. The other input end of the load battery charging circuit is connected to the other 4' point of the normally closed contact switch S4; one end of the rectifier and filter capacitor in the load battery charging circuit is connected to the positive terminal of the load battery, and the other end is connected to the normally closed contact 2' point of the single-pole double-throw switch S2.

9. A method for cooperative transmission of wireless charging energy signals based on topological multiplexing, characterized in that: The method adopts the system according to any one of claims 1 to 7, and the method comprises the following steps: S1, initial detection standby state: In the initial state, the action signals G1, G2, G3, and G4 of switches S1, S2, S3, and S4 are all low. At this time: the normally closed contact 1' of switch S1 is connected to COM1, the transmitting platform is in the detection state, and the energy inverter is partially disconnected; the normally closed contact 2 of switch S2 is connected to COM2, the load battery is in the charging state, and the signal inverter is partially disconnected; the connection between point 3 on one end of the normally open switch S3 and point 3' on the other end is disconnected, and the connection between point 4 on one end of the normally closed switch S4 and point 4' on the other end is connected, and there is no energy flow between the platform and the load battery; S2. Load-triggered pre-charge test: When the load is placed above the launch platform, the launch platform detects the presence of an object above, triggering the normally open contact 1 of switch S1 to be connected to the common terminal COM1, and the launch platform briefly switches to the energy transfer state to pre-charge the load. If the launch platform does not detect the presence of an object above, it returns to step S1. S3. Load self-test and mode decision: When the system equivalent circuit switches to the energy transmission-waiting-for-charging state, the transmitting platform supplies power to the load and determines whether the load detects energy input. If the load detects energy input, the platform completes pre-charging and switches to the detection state, and the system equivalent circuit is in the detection-waiting-for-charging state. If the load does not detect energy input, the process returns to step S1. At this point, there should be no energy input on the load side, and it is again determined whether the load detects energy input. If the load detects energy input, the platform completes pre-charging and switches to the detection state again until there is no energy input to the load. If there is no energy input to the load, the platform switches to the signal transmission state, transmits device status information to the platform, and the system equivalent circuit is in the detection-signal transmission state. S4, multiplexing communication transmission: When the system switches to the detection-signal transmission state, the load controls the on / off between point 3 on one end and point 3' on the other end of switch S3 according to the device information code, generating a 0-1 signal. The platform-side detection circuit receives and demodulates the load information. When the platform detects a signal input, it receives and identifies the device information and starts signal transmission. If the platform does not detect a signal input, it switches the equivalent circuit back to the signal transmission state. After signal transmission is started, the platform continuously detects the signal input. If there is a signal input, the platform continuously receives and identifies the device information. If there is no signal input, it determines that the information has been sent. S5, Adaptive charging mode switching: When the status information is sent, the load switches back to the waiting state. The platform side identifies the load information and switches to the charging topology and power mode required by the load. The system returns to the energy transmission-waiting state and starts charging.

10. The method for coordinated transmission of wireless charging energy signals based on topological multiplexing according to claim 9, characterized in that: In the wireless charging energy signal collaborative transmission method, the coding rules are collaboratively designed based on the hierarchical redundant source coding module, the structured data encapsulation module and the energy-to-signal topology multiplexing execution module. The hierarchical redundant source coding module performs single-bit triple redundant coding on conventional binary signals and realizes anti-interference and error correction through the majority decision mechanism. At the same time, it performs overall three-times repeated coding on the key termination signal to form a bit pattern that is distinguished from the conventional redundant coding; the structured data encapsulation module generates a binary sequence including a device identity field, a charging request field and a status control field, wherein the device identity field is composed of a fixed synchronization code, a device type code, a device serial number and a fixed check code 0101, the charging request field includes the maximum charging power, the integer part of the charging voltage and the decimal part of the charging voltage, and the status control field includes the pre-charging efficiency status, the charging mode and the signal termination code 0110 or the emergency termination code 1001.

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