A wireless energy and signal synchronous transmission device based on frequency shift and shift keying

Abstract

The present invention discloses a wireless energy and signal synchronous transmission device based on frequency shift and shift keying. The present invention includes a wireless charging transmitting mechanism and a wireless charging receiving mechanism; a frequency shift keying communication circuit is mounted in the wireless charging transmitting mechanism, and a shift keying communication circuit is mounted in the wireless charging receiving mechanism; the information of the transmitting mechanism is transmitted to the receiving mechanism by the frequency shift keying method, and the information of the receiving mechanism is transmitted to the transmitting mechanism by the shift keying method; the frequency shift keying and shift keying communication schemes do not require independent coils and can be directly integrated on the power transmitting and power receiving coils; a half-duplex wireless signal can be transmitted while the wireless power is being transmitted. The present invention effectively avoids the interference of communication signals during the wireless power transmission process, simplifies the communication mechanism, and effectively improves the fidelity of information transmission during the wireless charging process.

Description

Technical Field

[0001] The present invention relates to a device for synchronous transmission of wireless energy and signals, and particularly to a device for synchronous transmission of wireless energy and signals based on frequency shift and shift keying. Background Art

[0002] Since wireless charging technology has been widely applied in the biomedical field, especially with the wide application of in-vivo implanted sensors, high-speed and stable signal transmission has become an important issue. Due to the special in-vivo environment, sensors need to be as streamlined as possible and consume as little energy stored in the in-vivo sensors as possible, thus there is a need for power transmission and signal transmission to share a single coil or be concentrated in one place. At present, in the process of social development, the demand for wireless charging is increasing. Since there is currently no unified frequency band limit for wireless charging, wireless charging systems based on different frequency bands will interfere with surrounding communication signals. In addition, in the case of high-power wireless charging, fast and clear signal transmission has also become an important indicator to ensure charging safety. It has become more urgent to find a solution that can avoid interference from the external electromagnetic environment and quickly and stably complete signal communication between the transmitting and receiving mechanisms in a wireless charging system.

[0003] Currently, in the process of wireless charging power transmission, the scheme of integrating the signal transmission function with the power transmission coil is mainly the carrier communication scheme. This scheme makes full use of the harmonic characteristics in the resonant system and converts the harmonics that should originally be eliminated into available communication tools. It is an important research on integrating power transmission and signal transmission into one coil, but this scheme still faces problems such as high cost, independent decoupling chips, and heavy current transformers mounted on the coil in actual application, and further optimization is required in engineering applications. In addition, some scholars have proposed an information transmission scheme based on the primary power cycle as the basic clock and performing load transformation on this basis. This scheme has relatively strict requirements for the circuit and cannot be applied to general wireless charging systems. Summary of the Invention

[0004] The purpose of the present invention is to provide a scheme for enabling signals to be carried on the power transmission coil during the process of wireless charging power transmission, that is, wireless power transmission and wireless signal transmission share a set of coils, and can achieve fast and stable two-way signal transmission at low cost, and can realize half-duplex communication while performing one-way energy transmission, so as to solve the problems described in the background art section.

[0005] The present invention realizes half-duplex communication between a transmitting mechanism and a receiving mechanism during the wireless charging power transmission through frequency shift and shift keying methods, which only causes negligible interference to the power transmission and avoids interference from the external electromagnetic environment; in addition, the device can also detect the frequency of the transmitting coil and the current of the receiving coil to check the working conditions of the transmitting mechanism and the receiving mechanism, thereby avoiding abnormal functions caused by the contact of the device with other electromagnetic sources; the present invention is applicable to LCC type, S-S type, and LCC-S type wireless charging coil topologies, which better cover the coil topologies of wireless charging on the current market and make the device have better applicability.

[0006] To achieve the above object, the solution adopted by the present invention is as follows:

[0007] The present invention includes a wireless charging transmitting mechanism and a wireless charging receiving mechanism, which are wirelessly connected between the wireless charging transmitting mechanism and the wireless charging receiving mechanism;

[0008] The wireless charging transmitting mechanism includes a frequency shift keying communication circuit, a current shift demodulation circuit, and a resonant transmitting coil; the frequency shift keying communication circuit and the current shift demodulation circuit are both connected to the resonant transmitting coil; the wireless charging receiving mechanism includes a shift keying communication circuit, a current frequency shift demodulation circuit, and a resonant receiving coil, the shift keying communication circuit and the current frequency shift demodulation circuit are both connected to the resonant receiving coil, and the resonant transmitting coil and the resonant receiving coil are wirelessly connected;

[0009] The frequency shift keying communication circuit modulates the input level time sequence signal into a frequency signal and transmits the frequency signal to the resonant receiving coil through the resonant transmitting coil, and the current frequency shift demodulation circuit demodulates the frequency signal received by the resonant receiving coil into a duty cycle modulation signal and outputs it; the shift keying communication circuit modulates the input level time sequence signal into an amplitude signal and transmits the amplitude signal to the resonant transmitting coil through the resonant receiving coil, and the current shift demodulation circuit demodulates the amplitude signal received by the resonant transmitting coil into a level time sequence signal and outputs it, so that the resonant non-transmitting coil and the resonant receiving coil realize the synchronous transmission of wireless power and wireless signals.

[0010] The frequency shift keying communication circuit changes the transmission frequency of the resonant transmitting coil, so that the frequency in the forced vibration resonant receiving coil changes, and the current frequency shift demodulation circuit reads out different frequencies and demodulates them into a duty cycle modulation signal.

[0011] The shift keying communication circuit changes the load of the resonant receiving coil through a shift keying execution circuit, thereby changing the current of the resonant transmitting coil, and the current shift demodulation circuit reads out different amplitudes of current and demodulates them into a level time sequence signal.

[0012] The specific current shift demodulation circuit is as follows:

[0013] Both ends of the first transformer 4 are respectively connected to the first output and the third output of the first rectifier bridge. The second output of the first rectifier bridge is grounded. The fourth output of the first rectifier bridge is connected to the input end of the voltage comparator, and the output end of the voltage comparator serves as the output of the current shift demodulation circuit.

[0014] The specific current frequency shift demodulation circuit is as follows:

[0015] Both ends of the second transformer 8 are connected to the first output and the third output of the second rectifier bridge. The second output of the second rectifier bridge is grounded. The fourth output of the second rectifier bridge is connected to the input end of the hysteresis comparator, and the output end of the hysteresis comparator serves as the output of the current frequency shift demodulation circuit.

[0016] The specific shift keying execution circuit is as follows:

[0017] The input of the shift keying execution circuit is respectively connected to one end of the ninth resistor and the tenth resistor. The other end of the ninth resistor is successively connected to the other end of the tenth resistor through the eleventh resistor and the twelfth resistor. The other end of the ninth resistor is connected to the gate of the first field effect transistor. The drain of the first field effect transistor is connected to the U + power supply through the fourth capacitor. The source of the first field effect transistor is connected to the drain of the second field effect transistor and grounded. The other end of the tenth resistor is connected to the gate of the second field effect transistor. The source of the second field effect transistor is connected to the U - power supply through the fifth capacitor.

[0018] The resonant transmitting coil and the resonant receiving coil are one of the wireless charging coil topologies of LCC type, S-S type, and LCC-S type.

[0019] The transmission mode of the wireless signal is a half-duplex transmission mode with data verification.

[0020] The wireless charging transmitting mechanism is the host, and the wireless charging receiving mechanism is the slave; or the wireless charging transmitting mechanism is the slave, and the wireless charging receiving mechanism is the host.

[0021] The frequency shift keying communication circuit and the current shift demodulation circuit are both connected to the control system of the wireless charging transmitting mechanism, and the frequency shift keying communication circuit and the current frequency shift demodulation circuit are both connected to the control system of the wireless charging receiving mechanism.

[0022] In the present invention, the power transmission process is the same as that of a general wireless charging scheme. The system converts direct current into alternating current through an inverter bridge, and transmits energy to the wireless charging receiving mechanism through the resonant transmitting coil and the resonant receiving coil. The wireless charging receiving mechanism converts the alternating current into direct current through a rectifier bridge and outputs it to the electrical equipment.

[0023] The signal transmission is divided into the signal transmission from the wireless charging transmitting mechanism to the wireless charging receiving mechanism and the signal transmission from the wireless charging receiving mechanism to the wireless charging transmitting mechanism.

[0024] The signal transmission conversion process from the wireless charging transmitting mechanism to the wireless charging receiving mechanism is as follows: level time sequence signal - frequency signal - duty cycle modulation signal. The control system of the wireless charging transmitting mechanism converts the digital signal to be transmitted into a level time sequence signal and inputs it to the frequency shift keying communication circuit. The frequency shift keying communication circuit converts the level time sequence signal into a frequency signal by adjusting the output frequency of the inverter. After the frequency signal is sent to the wireless charging receiving mechanism through the resonant wireless charging coil, the receiving end demodulates the frequency signal into a duty cycle modulation signal through the current frequency shift demodulation circuit and transmits this signal to the control system of the wireless charging receiving mechanism. The control system of the wireless charging receiving mechanism restores the duty cycle modulation signal to a digital signal.

[0025] Frequency shift keying realizes the signal transmission from the wireless charging transmitting mechanism to the wireless charging receiving mechanism by modifying the transmission frequency of the resonant transmitting coil, so that the frequency of the forced vibration of the resonant receiving coil changes, and the change is read out. When the transmission frequency of the resonant transmitting coil changes, the frequency of the resonant receiving coil will have a short-term perturbation, and the perturbation is 2 - 5 frequency cycles, and finally stabilizes at the changed frequency. The perturbation needs to be avoided when reading the signal.

[0026] The realization of the frequency shift keying function does not require building a new circuit structure in the general resonant transmitting coil, and can be realized by controlling the inverter bridge.

[0027] The signal transmission conversion process from the wireless charging receiving mechanism to the wireless charging transmitting mechanism is as follows: level time sequence signal - amplitude signal - level time sequence signal. The control system of the wireless charging receiving mechanism converts the digital signal to be transmitted into a level time sequence signal and inputs it to the shift keying control circuit. The shift keying control circuit changes the load of the resonant receiving coil by controlling the shift keying execution circuit of the resonant receiving coil, and converts the level time sequence signal into an amplitude signal. After the amplitude signal is sent to the wireless charging transmitting mechanism through the resonant wireless charging coil, the wireless charging transmitting mechanism demodulates the amplitude signal into a level time sequence signal through the current shift demodulation circuit and transmits it to the control system of the wireless charging transmitting mechanism. The control system of the wireless charging transmitting mechanism restores the level time sequence signal to a digital signal.

[0028] Shift keying realizes signal transmission from the wireless charging receiving mechanism to the wireless charging transmitting mechanism by modifying the load of the resonant receiving coil, which changes the current of the resonant transmitting coil, and reading out this change. The current change of the resonant transmitting coil caused by the load change of the resonant receiving coil is completed within a single cycle. Accordingly, the data transmission rate from the wireless charging receiving mechanism to the wireless charging transmitting mechanism can be greater than that from the wireless charging transmitting mechanism to the wireless charging receiving mechanism.

[0029] To implement the shift keying function, a shift keying actuator needs to be built in a general resonant receiving coil, aiming to change the load of the resonant receiving coil. Since ordinary relays cannot reach the switching frequency required for communication, the shift keying actuator uses symmetrically arranged field effect transistors to complete the load change work in the alternating current frequency.

[0030] In general practical applications, the digital-frequency conversion control strategy and the current amplitude demodulation control strategy in the frequency shift keying communication circuit can be integrated into the control system of the wireless charging transmitting mechanism. Similarly, the digital-amplitude conversion control strategy and the current frequency demodulation control strategy in the shift keying communication circuit can also be integrated into the control system of the wireless charging receiving mechanism, thereby giving full play to the computing power of the control chip and achieving the purpose of cost reduction.

[0031] The beneficial effects of the present invention are as follows:

[0032] In the present invention, a set of wireless charging resonant coils is shared for wireless power transmission and wireless signal transmission, effectively reducing the system cost; wireless signal transmission can be carried out while wireless power transmission; half-duplex communication between the transmitting mechanism and the receiving mechanism of the wireless charging device can be achieved quickly, stably, and without being interfered by the external electromagnetic environment; it can be applied to most wireless charging coil topologies on the market, with good applicability; a fault detection circuit can be simply expanded on the basis of the existing mechanism. Description of the Drawings

[0033] Figure 1 is the system block diagram of wireless energy and signal synchronous transmission based on frequency shift and shift keying

[0034] Figure 2 is an example diagram of the wireless charging transmitting mechanism.

[0035] Figure 3 is an example diagram of the current shift demodulation circuit.

[0036] Figure 4 is an example diagram of the wireless charging receiving mechanism.

[0037] Figure 5 is an example diagram of the current frequency shift demodulation circuit.

[0038] Figure 6 It is an example diagram of a shift keying execution circuit.

[0039] In the figure: resonant transmitting coil 1, current shift demodulation circuit 2, frequency shift keying communication circuit 3, first mutual inductor 4, resonant receiving coil 5, current frequency shift demodulation circuit 6, shift keying communication circuit 7, second mutual inductor 8. Specific implementation mode

[0040] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. Figure 2 and Figure 4 In, solid lines represent circuits, dashed lines represent signal transmission, and arrows on the dashed lines represent the signal transmission direction.

[0041] The level timing signal of the present invention includes a wireless charging transmitting mechanism and a wireless charging receiving mechanism, and the wireless charging transmitting mechanism and the wireless charging receiving mechanism are wirelessly connected;

[0042] The wireless charging transmitting mechanism includes a frequency shift keying communication circuit, a current shift demodulation circuit, and a resonant transmitting coil; both the frequency shift keying communication circuit and the current shift demodulation circuit are connected to the resonant transmitting coil; the level timing signal the resonant transmitting coil is connected to a DC power supply. Level timing signal

[0043] The wireless charging receiving mechanism includes a shift keying communication circuit, a current frequency shift demodulation circuit, and a resonant receiving coil. Both the shift keying communication circuit and the current frequency shift demodulation circuit are connected to the resonant receiving coil, and the resonant transmitting coil and the resonant receiving coil are wirelessly connected; the level timing signal the resonant receiving coil is connected to an electrical device. Level timing signal

[0044] In specific implementation, both the frequency shift keying communication circuit and the current shift demodulation circuit are connected to the control system of the wireless charging transmitting mechanism, and both the shift keying communication circuit and the current frequency shift demodulation circuit are connected to the control system of the wireless charging receiving mechanism. Level timing signal

[0045] The frequency-shift keying communication circuit modulates the level sequence signal input by the control system of the wireless charging transmitter mechanism into a frequency signal and transmits the frequency signal to the resonant receiving coil through the resonant transmitting coil. The current frequency-shift demodulation circuit demodulates the frequency signal received by the resonant receiving coil into a duty-cycle modulation signal and outputs the level sequence signal to the control system of the wireless charging receiver mechanism. The frequency-shift keying communication circuit changes the transmission frequency of the resonant transmitting coil, causing the frequency in the forced-vibrating resonant receiving coil to change. The current frequency-shift demodulation circuit reads different frequencies and demodulates them into duty-cycle modulation signals. The shift keying communication circuit modulates the level sequence signal input by the control system of the wireless charging receiver mechanism into an amplitude signal and transmits the amplitude signal to the resonant transmitting coil through the resonant receiving coil. The current shift demodulation circuit demodulates the amplitude signal received by the resonant transmitting coil into a level sequence signal and outputs the level sequence signal to the control system of the wireless charging transmitter mechanism. The shift keying communication circuit changes the load of the resonant receiving coil through the shift keying execution circuit, thereby changing the current of the resonant transmitting coil. The current shift demodulation circuit reads different amplitudes of current and demodulates them into level sequence signals. The level sequence signal thus enables the resonant transmitting coil and the resonant receiving coil to undertake the work of the signal path. Under resonant conditions, the wireless charging transmitter mechanism transmits power to the wireless charging receiver mechanism through the resonant transmitting coil and the resonant receiving coil. The wireless charging receiver mechanism passively obtains the power emitted by the wireless charging transmitter mechanism through the resonant transmitting coil and the resonant receiving coil. Therefore, the resonant transmitting coil undertakes the work of power transmission, and the resonant receiving coil undertakes the work of power reception. Finally, the level sequence signal enables the resonant transmitting coil and the resonant receiving coil to achieve synchronous transmission of wireless power and wireless signals. The transmissions of the two do not affect each other.

[0046] As Figure 1As shown, the DC power supply transmits energy to the resonant transmitting coil; the resonant transmitting coil transmits alternating power to the resonant receiving coil through an inverter; the resonant receiving coil converts the alternating power into DC power for use by the electrical equipment through a rectifier bridge; the wireless charging transmitting mechanism control system converts the digital signal into a level timing signal and transmits it to the frequency shift keying communication circuit; the frequency shift keying communication circuit converts the level timing signal into a frequency signal by adjusting the alternating frequency of the resonant transmitting coil; the frequency signal is transmitted to the resonant receiving coil through the resonant transmitting coil; the current frequency shift demodulation circuit converts the frequency signal into a duty cycle modulation signal by reading the frequency of the current in the resonant receiving coil and sends it to the wireless charging receiving mechanism control system; the wireless charging receiving mechanism control system demodulates the duty cycle modulation signal into a digital signal; the wireless charging receiving mechanism control system converts the digital signal into a level timing signal and transmits it to the shift keying communication circuit; the shift keying communication circuit converts the level timing signal into an amplitude signal by adjusting the relay load in the resonant receiving coil; the amplitude signal is transmitted to the resonant transmitting coil through the resonant receiving coil; the current shift demodulation circuit converts the amplitude signal into a level timing signal by reading the amplitude of the current in the resonant transmitting coil and sends it to the wireless charging transmitting mechanism control system; the wireless charging transmitting mechanism control system demodulates the level timing signal into a digital signal.

[0047] The resonant transmitting coil and the resonant receiving coil are one of the wireless charging coil topologies of LCC type, S-S type, and LCC-S type. The types of the resonant transmitting coil and the resonant receiving coil for the level timing signal are the same. The level timing signal

[0048] The signal transmission of the present invention is affected by the coupling situation between the resonant transmitting coil and the resonant receiving coil. The transmission mode of the wireless signal is a half-duplex transmission mode with data verification. The transmission mode of the wireless power is a unidirectional transmission. The level timing signal

[0049] The signal transmission of the present invention is a half-duplex signal transmission. The receiving mechanism and the transmitting mechanism cannot send information simultaneously. Therefore, the wireless charging transmitting mechanism is the master, and the wireless charging receiving mechanism is the slave; or the wireless charging transmitting mechanism is the slave, and the wireless charging receiving mechanism is the master, so as to meet the requirements of the half-duplex transmission mode with data verification.

[0050] The current shift demodulation circuit demodulates the received amplitude signal into a level timing signal and transmits it to the wireless charging transmitting mechanism control system. The current frequency shift demodulation circuit demodulates the received frequency signal into a duty cycle modulation signal and transmits it to the wireless charging receiving mechanism control system. The level timing signal

[0051] AsFigure 2 As shown in the figure, the wireless charging transmitting mechanism consists of a resonant transmitting coil 1, a current shift demodulation circuit 2, and a frequency shift keying communication circuit 3; the resonant transmitting coil 1 adopts an S-shaped topology.

[0052] As Figure 3 shown, the current shift demodulation circuit is specifically:

[0053] Both ends of the first mutual inductor 4 are respectively connected to the first output and the third output of the first rectifier bridge. The second output of the first rectifier bridge is grounded, and the fourth output of the first rectifier bridge is connected to the input end of the voltage comparator. The output end of the voltage comparator serves as the output of the current shift demodulation circuit. The level timing signal voltage comparator is specifically:

[0054] The fourth output of the first rectifier bridge is connected to the non-inverting end of the first operational amplifier. The fourth output of the first rectifier bridge is also grounded through the first capacitor, and the first capacitor is used to stabilize the voltage of the fourth output of the first rectifier bridge; the reference voltage is obtained by dividing the voltage between the VCC power supply and the ground through the first resistor and the second resistor. The reference voltage is connected to the inverting end of the first operational amplifier. The output end of the first operational amplifier passes through an RC filter circuit composed of the third resistor and the second capacitor and serves as the output end of the voltage comparator, that is, the output of the current shift demodulation circuit, that is, the level timing signal. The level timing signal

[0055] The current shift demodulation circuit 2 collects the amplitude signal through the first mutual inductor 4 (it can also be achieved by other means such as a sampling resistor). Through the voltage comparator, the current shift signal can be converted into a level timing signal; the frequency shift keying communication circuit 3 adjusts the transmission frequency of the system by controlling the inverter bridge of the resonant transmitting coil.

[0056] As Figure 4 shown, the wireless charging receiving mechanism consists of a resonant receiving coil 5, a current frequency shift demodulation circuit 6, and a shift keying communication circuit 7; the resonant receiving coil 5 adopts an S-shaped topology. The relay load in the resonant receiving coil adopts a capacitor. Under the condition that the communication frequency requirement exceeds 1 Kb / s, a relay cannot be used to turn on and off the relay load. As Figure 6 shown, at the connection point U + is connected to both ends of the power receiving of U - , Sig is connected to the signal input, and the on and off of the relay load is realized through a symmetric circuit with a field effect transistor as the core, and its function is the same as that of an ideal relay.

[0057] As Figure 5 shown, the current frequency shift demodulation circuit is specifically:

[0058] Both ends of the second current transformer 8 are connected to the first output and the third output of the second rectifier bridge. The second output of the second rectifier bridge is grounded. The fourth output of the second rectifier bridge is connected to the input terminal of the hysteresis comparator. The output terminal of the hysteresis comparator serves as the output timing signal of the current frequency shift demodulation circuit. Specifically, the hysteresis comparator is configured as follows: The fourth output of the second rectifier bridge is connected to the non-inverting terminal of the second operational amplifier after passing through the fourth resistor. The non-inverting terminal of the second operational amplifier is connected to the output terminal of the second operational amplifier after passing through the fifth resistor. The reference voltage is obtained by dividing the voltage between the VCC power supply and the ground through the sixth resistor and the seventh resistor. The reference voltage is connected to the inverting terminal of the second operational amplifier. The output terminal of the second operational amplifier passes through an RC filter circuit composed of the eighth resistor and the third capacitor and then serves as the output terminal of the hysteresis comparator, that is, the output of the current frequency shift demodulation circuit, namely the timing signal of the duty cycle modulation signal.

[0059] The current frequency shift demodulation circuit 6 collects the frequency signal through the second current transformer 8 (it can also be achieved by other means such as a sampling resistor). Through the hysteresis comparator, the current frequency shift signal can be converted into a timing signal of the level. The shift keying communication circuit 7 adjusts the system amplitude by controlling the relay load in the resonant receiving coil.

[0060] The working process of the power transmission of the present invention is as follows:

[0061] a) The DC power supply forms an alternating power through the inverter.

[0062] b) The alternating power output by the inverter emits electric energy through the resonant transmitting coil 1.

[0063] c) The resonant receiving coil 5 captures the electric energy emitted by the resonant wireless charging transmitting coil 1 and outputs it to the electrical equipment through the rectifier bridge.

[0064] The working process of transmitting the signal from the transmitting mechanism to the receiving mechanism of the present invention is as follows:

[0065] a) The wireless charging transmitting mechanism converts the digital signal into a timing signal of the level and transmits it to the frequency shift keying communication circuit 3.

[0066] b) The frequency shift keying communication circuit 3 converts the timing signal of the level into a frequency signal in the resonant transmitting coil 1 by controlling the inverter bridge.

[0067] c) The resonant receiving coil 5 captures the frequency signal emitted by the resonant transmitting coil 1.

[0068] d) The current second current transformer 8 extracts the frequency signal in the resonant receiving coil 5 and transmits it to the current frequency demodulation circuit 6

[0069] e) The current frequency demodulation circuit 6 converts the frequency signal into a duty cycle modulation signal and sends it to the control system of the wireless charging receiving mechanism.

[0070] f) The wireless charging receiver mechanism control system restores the duty cycle modulation signal to a digital signal.

[0071] The working process of transmitting the signal from the receiver mechanism to the transmitter mechanism in the present invention is as follows:

[0072] a) The wireless charging receiver mechanism control system converts the digital signal into a level timing signal and transmits it to the shift keying communication circuit 7.

[0073] b) The shift keying communication circuit 7 converts the level timing signal into an amplitude signal in the resonant receiving coil 5 by controlling the relay load of the resonant receiving coil.

[0074] c) The resonant transmitting coil 1 captures the amplitude signal emitted by the resonant non-receiving coil 5.

[0075] d) The current first transformer 4 extracts the amplitude signal in the resonant transmitting coil 1 and transmits it to the current amplitude demodulation circuit 2.

[0076] e) The current amplitude demodulation circuit 2 converts the amplitude signal into a level timing signal and sends it to the wireless charging transmitter mechanism control system.

[0077] f) The wireless charging transmitter mechanism control system restores the level timing signal to a digital signal.

Claims

1. A wireless energy and signal synchronous transmission device based on frequency shift and shift keying, characterized in that, it includes a wireless charging transmitting mechanism and a wireless charging receiving mechanism, and the wireless charging transmitting mechanism and the wireless charging receiving mechanism are wirelessly connected; the wireless charging transmitting mechanism includes a frequency shift keying communication circuit, a current shift demodulation circuit and a resonant transmitting coil; the frequency shift keying communication circuit and the current shift demodulation circuit are both connected to the resonant transmitting coil; the wireless charging receiving mechanism includes a shift keying communication circuit, a current frequency shift demodulation circuit and a resonant receiving coil, the shift keying communication circuit and the current frequency shift demodulation circuit are both connected to the resonant receiving coil, and the resonant transmitting coil and the resonant receiving coil are wirelessly connected; the frequency shift keying communication circuit modulates the input level time sequence signal into a frequency signal and transmits the frequency signal to the resonant receiving coil through the resonant transmitting coil, and the current frequency shift demodulation circuit demodulates the frequency signal received by the resonant receiving coil into a duty cycle modulation signal and outputs it; the shift keying communication circuit modulates the input level time sequence signal into an amplitude signal and transmits the amplitude signal to the resonant transmitting coil through the resonant receiving coil, and the current shift demodulation circuit demodulates the amplitude signal received by the resonant transmitting coil into a level time sequence signal and outputs it, so that the resonant transmitting coil and the resonant receiving coil realize the synchronous transmission of wireless power and wireless signals; the shift keying communication circuit changes the load of the resonant receiving coil through a shift keying execution circuit, thereby changing the current of the resonant transmitting coil, and the current shift demodulation circuit reads and demodulates different amplitudes of current into a level time sequence signal; the shift keying execution circuit is specifically: the input of the shift keying execution circuit is respectively connected to one end of the ninth resistor and the tenth resistor, the other end of the ninth resistor is sequentially connected to the other end of the tenth resistor through the eleventh resistor and the twelfth resistor, and the connection between the eleventh resistor and the twelfth resistor is grounded; the other end of the ninth resistor is connected to the gate of the first field effect transistor, the drain of the first field effect transistor is connected to the U+ power supply through the fourth capacitor, the source of the first field effect transistor is connected to the drain of the second field effect transistor and grounded, the other end of the tenth resistor is connected to the gate of the second field effect transistor, and the source of the second field effect transistor is connected to the U- power supply through the fifth capacitor.

2. The wireless energy and signal synchronous transmission device based on frequency shift and shift keying according to claim 1, characterized in that, the frequency shift keying communication circuit changes the transmission frequency of the resonant transmitting coil, so that the frequency in the forced vibration resonant receiving coil changes, and the current frequency shift demodulation circuit reads and demodulates different frequencies into a duty cycle modulation signal.

3. The wireless energy and signal synchronous transmission device based on frequency shift and shift keying according to claim 1, characterized in that, the current shift demodulation circuit is specifically: both ends of the first mutual inductor are respectively connected to two input ends of the first rectifier bridge, one output of the first rectifier bridge is grounded, the other output of the first rectifier bridge is connected to the input end of the voltage comparator, and the output end of the voltage comparator is used as the output of the current shift demodulation circuit.

4. A wireless energy and signal synchronous transmission device based on frequency shift and shift keying according to claim 1, characterized in that, the current frequency shift demodulation circuit is specifically: Both ends of the second transformer are connected to two input terminals of the second rectifier bridge. One output of the second rectifier bridge is grounded, and the other output of the second rectifier bridge is connected to the input terminal of the hysteresis comparator. The output terminal of the hysteresis comparator serves as the output of the current frequency shift demodulation circuit.

5. A wireless energy and signal synchronous transmission device based on frequency shift and shift keying according to claim 1, characterized in that, the resonant transmitting coil and the resonant receiving coil are one of the wireless charging coil topologies of LCC type, S-S type, and LCC-S type.

6. A wireless energy and signal synchronous transmission device based on frequency shift and shift keying according to claim 1, characterized in that, the transmission mode of the wireless signal is a half-duplex transmission mode with data verification.

7. A wireless energy and signal synchronous transmission device based on frequency shift and shift keying according to claim 1, characterized in that, the wireless charging transmitting mechanism is the host, and the wireless charging receiving mechanism is the slave; or the wireless charging transmitting mechanism is the slave, and the wireless charging receiving mechanism is the host.

8. A wireless energy and signal synchronous transmission device based on frequency shift and shift keying according to claim 1, characterized in that, the frequency shift keying communication circuit and the current shift demodulation circuit are both connected to the control system of the wireless charging transmitting mechanism, and the shift keying communication circuit and the current frequency shift demodulation circuit are both connected to the control system of the wireless charging receiving mechanism.

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