Wireless electric energy and bidirectional data parallel transmission method and system

Abstract

The invention provides a wireless electric energy and bidirectional data parallel transmission method and system. According to the method, a forward signal is injected into an electric energy carrier, an LCC resonance compensation topology transmits the electric energy carrier carrying an FSK modulation signal from a forward transmitting end to a forward receiving end, after the forward receiving end passes through the LCC resonance compensation topology and a rectification circuit, an FSK demodulator is used for demodulating an original signal, and synchronous transmission of electric energy and forward data is completed; a part of electric energy in a synchronous transmission stage of electric energy and forward data is used as a modulation carrier, ASK modulation is carried out on a reverse signal by controlling the conduction state of an MOS tube through high and low levels, an SS resonance compensation topology is used as a data transmission channel, the ASK modulation signal is transmitted from a reverse transmitting end to a reverse receiving end, ASK signal demodulation is carried out at the reverse receiving end, and the signal is transmitted to the reverse receiving end. And reverse data transmission is completed. According to the invention, the parallel transmission of bidirectional data is realized under the condition of ensuring good electric energy transmission characteristics.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical systems, and in particular to a method and system for parallel transmission of wireless power and bidirectional data. Background Art

[0002] With the accelerated development of electrification, how to efficiently transmit electric energy and realize the interaction of various information has become one of the primary goals of electrification development; traditional limited transmission will lead to the consequence of messy wires as its products increase, increasing maintenance costs. Since the standards of chargers, wires, and sockets are not completely unified, safety accidents and environmental pollution will also occur during the movement and plugging process.

[0003] Existing wireless transmission mainly includes three modes: wireless communication module, independent channel and shared channel. When the wireless communication module uses Bluetooth and mobile communication technology to transmit data, the use of the communication module will increase the system cost. The power transmission will cause a strong electromagnetic environment around the device, which may easily lead to problems such as data transmission failure. When the independent channel realizes parallel transmission of signals by adding a pair of extra coils, the volume of the system will be increased and the application scenarios will be limited. When the shared channel uses the power transmission coil as the data transmission channel, there will be the problem of mutual interference between power and data, which will affect the power transmission characteristics and data transmission quality. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention adds an FSK data signal modulation power wave circuit and a demodulation circuit to complete the synchronous transmission of power and forward data during the synchronous transmission stage of power and forward data; in the reverse data transmission stage, an ASK modulation, demodulation circuit and an SS resonance compensation topology transmission channel are added to realize the transmission of reverse data. The parallel transmission of power and bidirectional data is realized without affecting the quality of power transmission.

[0005] The present invention provides a method for parallel transmission of wireless energy and bidirectional data, and the technical solution is as follows:

[0006] A method for parallel transmission of wireless energy and bidirectional data, characterized in that it comprises the following steps:

[0007] In the synchronous transmission stage of electric energy and forward data, the FSK frequency modulator modulates the forward signal and injects it into the electric energy carrier to obtain the FSK modulated signal. The LCC resonant compensation topology transmits the electric energy carrier carrying the FSK modulated signal from the forward transmitting end to the forward receiving end through the primary side forward induction transmission coil. The forward receiving end demodulates the FSK modulated signal to complete the synchronous transmission of electric energy and forward data.

[0008] In the reverse data transmission stage, the ASK modulator uses the electric energy return flow in the synchronous transmission stage of the electric energy and the forward data as the modulation carrier, and performs ASK modulation on the reverse signal by controlling the conduction state of the MOS tube by high and low levels to obtain an ASK modulated signal. The SS resonant compensation topology is used as the data transmission channel, and the ASK modulated signal is transmitted from the reverse transmitting end to the reverse receiving end through the reverse induction transmission coil on the secondary side. The reverse receiving end demodulates the ASK modulated signal to complete the transmission of the reverse data.

[0009] Furthermore, the synchronous transmission phase of the electric energy and the forward data includes a forward transmitting end and a forward receiving end, and the reverse data transmission phase includes a reverse transmitting end and a reverse receiving end, wherein the forward transmitting end and the reverse receiving end are the primary side, and the forward receiving end and the reverse transmitting end are the secondary side, wherein:

[0010] The forward transmitting end includes a DC power supply, a high-frequency inverter circuit, a transmitting end LCC resonant compensation topology, and a primary side forward induction transmission coil connected in sequence; the forward receiving end includes a secondary side forward induction transmission coil, a receiving end LCC resonant compensation topology, a rectifier circuit, and a load RL connected in sequence; the high-frequency inverter circuit is connected to an FSK modulator; the rectifier circuit is connected to an FSK demodulator; the synchronous transmission stage of the electric energy and the forward data has two operating frequencies, one of which is the inherent resonant frequency ω of the system p Determines the transmission rate, a resonant frequency ω d Used to adjust the system resonance state and for reverse data signal transmission; the FSK modulator modulates the operating frequency of the high-frequency inverter circuit, injects the forward signal into the electric energy carrier, and the LCC resonant compensation topology at the transmitting end transmits the electric energy carrier carrying the FSK modulated signal to the forward receiving end through the primary side forward induction transmission coil; the secondary side forward induction transmission coil receives the electric energy carrier of the forward transmitting end, and after passing through the LCC resonant compensation topology and rectification circuit at the receiving end, the FSK demodulator demodulates the FSK modulated signal to complete the synchronous transmission of electric energy and forward data;

[0011] The reverse transmitting end includes an ASK modulator, a transmitting end SS resonant compensation topology, and a secondary side reverse induction transmission coil connected in sequence; the reverse receiving end includes a primary side reverse induction transmission coil, a receiving end SS resonant compensation topology, and an ASK demodulator connected in sequence; the forward receiving end LCC resonant compensation topology and the reverse transmitting end SS resonant compensation topology are connected to the ASK modulator; the ASK modulator uses the electric energy return in the synchronous transmission stage of electric energy and forward data as the modulation carrier, and performs ASK modulation on the reverse signal by controlling the conduction state of the MOS tube by high and low levels to obtain an ASK modulated signal; the transmitting end SS resonant compensation topology transmits the ASK modulated signal to the reverse receiving end through the secondary side reverse induction transmission coil; the primary side reverse induction transmission coil receives the ASK modulated signal sent by the reverse transmitting end, and after passing through the receiving end SS resonant compensation topology, the ASK demodulator demodulates the ASK signal to complete the transmission of reverse data.

[0012] Furthermore, the DC power supply is a DC voltage source; the high-frequency inverter circuit includes MOS tube Q1, MOS tube Q2, MOS tube Q3, and MOS tube Q4, and MOS tube Q1, MOS tube Q2, MOS tube Q3, and MOS tube Q4 are all connected to the FSK modulator; the ASK modulator includes MOS tube Q5, and MOS tube Q5 is connected to the forward receiving end LCC resonant compensation topology and the transmitting end SS resonant compensation topology.

[0013] Furthermore, the rectifier circuit includes a diode D1, a diode D2, a diode D3, and a diode D4; the cathode of the diode D1 is connected to the cathode of the diode D3, the anode of the diode D2 is connected to the anode of the diode D4, the anode of the diode D1 is connected to the cathode of the diode D2, the anode of the diode D3 is connected to the cathode of the diode D4, the anode of the diode D1 and the cathode of the diode D4 serve as input ends of the rectifier circuit, and the cathode of the diode D3 and the anode of the diode D2 serve as output ends of the rectifier circuit; the rectifier circuit also includes a filter capacitor CL, which is a polar capacitor, the anode of the filter capacitor CL is connected to the cathode of the diode D3, and the cathode of the filter capacitor CL is connected to the anode of the diode D4.

[0014] Furthermore, in the synchronous transmission stage of the electric energy and the forward data, obtaining the maximum output power of the electric energy includes the following steps:

[0015] ① The input and output power P of the system in the resonant state during the synchronous transmission stage of obtaining electric energy and forward data in and P o :

[0016]

[0017]

[0018] In formula (1), U dc is the DC input voltage of the system; in formula (2), R L is the actual resistance load; in formula (3), I t1 is the current of the primary side forward sending end loop; in formula (7), Z R is the reflected impedance at resonance;

[0019] ②According to Kirchhoff's voltage law, the working voltage and current relationship of each circuit is obtained:

[0020]

[0021] In formula (10), I t1 is the current of the primary side forward sending end loop; I r1 is the current of the secondary side positive receiving end loop; I r2 is the current of the reverse data sending end loop on the secondary side; I t2 is the current of the reverse data receiving end loop on the primary side; according to formula (10), the current value of each loop can be obtained as follows:

[0022]

[0023] ③ Obtain the maximum output power. The output power of the electric energy is affected by the mutual inductance M between the transmission coils and the load. Analyze the different values ​​of M and R dp The impact on system transmission is to design induction transmission coils of different sizes and structures so that the mutual inductance between the power resonant coupling mechanism and the signal resonant coupling mechanism approximately satisfies M1=M t11 =M t12 , M2=M t21 =M t22 , M=M t11 +Mt 12 =2M1; when R dp Much larger than R L When the output power P o is the maximum value, at this time P o for:

[0024]

[0025] In the formula, the voltage source U connected to the forward transmitting end is i ; The forward receiving end equivalent AC resistance R eq ; The equivalent impedance Z of the loop where the forward transmitting end power transmission system coil is located t1 ; The equivalent impedance Z of the forward receiving end power transmission system coil r1The forward transmitting end LCC resonant compensation topology includes a compensation capacitor C connected in series with the primary side forward induction transmission coil ps , parallel compensation capacitor C connected in parallel with the primary side forward induction transmission coil pp , the series compensation inductor L connected in parallel with the primary side forward induction transmission coil ps The primary side forward induction transmission coil adopts an inductor L pp The forward receiving end LCC resonant compensation topology includes a compensation capacitor C connected in series with the secondary side forward induction transmission coil ss , parallel compensation capacitor C connected in parallel with the secondary side forward induction transmission coil sp , the series compensation inductor L connected in parallel with the secondary side forward induction transmission coil ss The secondary side forward induction transmission coil adopts an inductor L sp ; The transmission frequency ω of the synchronous transmission phase of the electric energy and the forward data p ; The input and output power P of the system in the resonant state during the synchronous transmission phase of the electric energy and the forward data in and P o ;

[0026] The reverse transmitting end SS resonant compensation topology includes a compensation capacitor C connected in series with the secondary side reverse induction transmission coil. dp The secondary side reverse induction transmission coil adopts inductance L dp ; The reverse data sending end equivalent resistance R dp The reverse receiving end SS resonant compensation topology includes a compensation capacitor C connected in series with the primary side reverse induction transmission coil ds The primary side reverse induction transmission coil adopts inductance L ds ; The equivalent resistance R of the reverse data receiving end ds ; The equivalent impedance Z of the reverse data transmission circuit dp ; The total impedance Z of the loop where the reverse data sending end is located r2 ; The total impedance Z of the loop where the reverse data receiving end is located t2 The working resonant frequency of the reverse data transmission phase and the center frequency of the inductor resistor filter are ω d ;

[0027] The mutual inductance value M between the induction transmission coils t 、M t11 、M t12 、M r 、M t21 、M t22 ; The initial mutual inductance value M1 of the primary side forward induction transmission coil and the secondary side forward induction transmission coil; The initial mutual inductance value M2 of the secondary side reverse induction transmission coil and the primary side reverse induction transmission coil.

[0028] Furthermore, the FSK frequency modulator modulation and FSK demodulator demodulation in the synchronous transmission stage of the electric energy and the forward data specifically include the following steps:

[0029] The FSK modulator performs FSK modulation on the forward signal and injects the forward signal into the electric energy carrier. The LCC resonant compensation topology transmits the electric energy carrier carrying the FSK modulation signal from the forward transmitting end to the forward receiving end through the primary side forward induction transmission coil. The forward receiving end demodulates the FSK modulation signal to complete the synchronous transmission of electric energy and forward data. After FSK modulation, the digital signal S FSK The expression of (t) modulation is:

[0030]

[0031] The specific modulation process is as follows:

[0032] a. When the digital signal at the receiving end is 1, the FSK modulator modulation circuit outputs a pulse with a frequency of f1;

[0033] b. When the digital signal at the receiving end is 0, the FSK modulation circuit outputs a pulse with a frequency of f2;

[0034] c. The LCC resonant compensation topology at the transmitting end transmits the power carrier carrying the FSK signal to the forward receiving end through the primary side forward induction transmission coil;

[0035] d. The forward receiving end receives the electric energy carrier with FSK signal to prevent excessive loss of electric energy and avoid damage to the subsequent demodulation network caused by excessive signal voltage amplitude. The wave blocking network is used to isolate the demodulation circuit from the electric energy transmission channel;

[0036] e. Use a diode envelope detector to filter out the power carrier and extract the voltage change envelope of the FSK modulated signal;

[0037] f. Further filter out the high-frequency carrier and noise still contained in the signal through a low-pass filter;

[0038] g. After the two-stage voltage comparator performs shaping processing, the original data signal is obtained by setting the threshold voltage and comparing and judging, completing the signal demodulation process;

[0039] Among them, there are two working frequencies ω in the synchronous transmission stage of power and forward data. p and ω d ,ω p The natural resonant frequency of the system determines the transmission rate; ω dIt is used to adjust the system resonance state and for reverse data signal transmission, that is, the working resonance frequency of the reverse data transmission stage and the center frequency of the inductor resistance filter. In order to ensure that the system works reasonably and efficiently and avoids interference between power and reverse data transmission, ω p and ω d The value interval is as large as possible, and the quality factor Q of this data transmission process is calculated in the resonant state. f and signal channel bandwidth Bw f , Q f and Bw f The expression is:

[0040]

[0041] In formula (16), R d It is the equivalent internal resistance of the demodulation circuit, and is used to extract the forward data signal by voltage division. When the FSK modulator modulates and causes the frequency to change, the voltage envelope amplitude changes, and is used to perform envelope demodulation on the electric energy carrier voltage at the forward receiving end to restore the original signal.

[0042] Furthermore, the ASK modulator modulation and the ASK demodulator demodulation in the reverse data transmission stage include the following steps:

[0043] The secondary side reverse induction transmission coil is added to the ASK modulation network, and the SS resonant compensation topology circuit is used as the data transmission channel. It is transmitted from the reverse sending end to the reverse receiving end through the secondary side induction transmission coil; the working resonant frequency of the reverse data transmission stage and the center frequency ω of the inductor resistance filter are used. d The electric energy reflux carried by the resonant frequency component is used as a modulated carrier to realize reverse ASK signal transmission by controlling the conduction state of the MOS tube through high and low levels; the ASK modulated signal maintains the working resonant frequency of the reverse data transmission stage and the center frequency ω of the inductor resistance filter d The voltage amplitude changes with the change of the modulated digital signal; the baseband data signal pulse S after ASK demodulator modulation ASK (t) is expressed as:

[0044] S ASK (t)=S(t)cos(2πf1t)0≤t≤T (17)

[0045] The specific modulation process is as follows:

[0046] a. When the digital signal is at a high level of "1", the MOS tube is turned on, and the electric energy carrier flows through the band-stop filter and then flows to the ground through the MOS tube;

[0047] b. When the digital signal is at a low level of "0", the MOS tube is cut off, and the power carrier passes through the band-stop filter and is resonantly coupled to the data receiving end through the resonant circuit;

[0048] c. The electric energy carrier is transmitted to the reverse receiving end through the resonant circuit after passing through the resistor; the total impedance of the reverse transmitting end and the receiving end is:

[0049]

[0050] The quality factor Qr is calculated based on the system circuit:

[0051]

[0052] The communication bandwidth Bw for reverse data transmission can be calculated from the bandwidth formula: r for:

[0053]

[0054] d. The reverse receiving end receives the ASK modulated signal and uses a diode envelope detector to extract the voltage change envelope of the ASK modulated signal;

[0055] e. Use a low-pass filter to further filter out the high-frequency carrier and noise still contained in the signal, so as to more accurately restore the baseband signal;

[0056] f. After being shaped by a two-stage voltage comparator, the original data signal is obtained by setting the threshold voltage and comparing and judging, completing the ASK modulated signal demodulation process.

[0057] The present invention also provides a wireless power and bidirectional data parallel transmission system, the technical solution is as follows:

[0058] A wireless power and bidirectional data parallel transmission system, characterized in that it comprises a synchronous transmission module for power and forward data, which is used to modulate a forward signal and inject it into a power carrier to obtain an FSK modulation signal, and an LCC resonant compensation topology transmits the power carrier carrying the FSK modulation signal from a forward transmitting end to a forward receiving end through a primary side forward induction transmission coil, and the forward receiving end demodulates the FSK modulation signal to complete the synchronous transmission of power and forward data;

[0059] The reverse data transmission module is used to use the electric energy return flow in the synchronous transmission stage of electric energy and forward data as the modulation carrier, perform ASK modulation on the reverse signal by controlling the conduction state of the MOS tube by high and low levels to obtain an ASK modulated signal, use the SS resonant compensation topology as the data transmission channel, and transmit the ASK modulated signal from the reverse transmitting end to the reverse receiving end through the secondary side reverse induction transmission coil. The reverse receiving end demodulates the ASK modulated signal to complete the transmission of reverse data.

[0060] Preferably, the synchronous transmission module of electric energy and forward data includes a forward transmitting end and a forward receiving end, and the reverse data transmission module includes a reverse transmitting end and a reverse receiving end, the forward transmitting end and the reverse receiving end are the primary side, and the forward receiving end and the reverse transmitting end are the secondary side, wherein:

[0061] The forward transmitting end includes a DC power supply, a high-frequency inverter circuit, a transmitting end LCC resonant compensation topology, and a primary side forward induction transmission coil connected in sequence; the forward receiving end includes a secondary side forward induction transmission coil, a receiving end LCC resonant compensation topology, a rectifier circuit, and a load RL connected in sequence; the high-frequency inverter circuit is connected to an FSK modulator; the rectifier circuit is connected to an FSK demodulator; the FSK modulator modulates the working frequency of the high-frequency inverter circuit and injects the forward signal into the electric energy carrier, and the transmitting end LCC resonant compensation topology transmits the electric energy carrier carrying the FSK modulated signal to the forward receiving end through the primary side forward induction transmission coil; the secondary side forward induction transmission coil receives the electric energy carrier of the forward transmitting end, and after passing through the receiving end LCC resonant compensation topology and the rectifier circuit, the FSK demodulator demodulates the FSK modulated signal to complete the synchronous transmission of electric energy and forward data;

[0062] The reverse transmitting end includes an ASK modulator, a transmitting end SS resonant compensation topology, and a secondary side reverse induction transmission coil connected in sequence; the reverse receiving end includes a primary side reverse induction transmission coil, a receiving end SS resonant compensation topology, and an ASK demodulator connected in sequence; the forward receiving end LCC resonant compensation topology is connected to the ASK modulator; the ASK modulator uses the electric energy return in the synchronous transmission stage of electric energy and forward data as the modulation carrier, and performs ASK modulation on the reverse signal by controlling the conduction state of the MOS tube by high and low levels to obtain an ASK modulated signal; the transmitting end SS resonant compensation topology transmits the ASK modulated signal to the reverse receiving end through the secondary side reverse induction transmission coil; the primary side reverse induction transmission coil receives the ASK modulated signal emitted by the reverse transmitting end, and after passing through the receiving end SS resonant compensation topology, the ASK demodulator demodulates the ASK signal to complete the transmission of reverse data.

[0063] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0064] The present invention provides a method for parallel transmission of wireless power and bidirectional data, which realizes the parallel transmission of bidirectional data under the condition of ensuring good power transmission characteristics, including synchronous transmission of power and forward data and reverse data transmission. In the synchronous transmission stage of power and forward data, the FSK frequency modulation technology is used to modulate the working frequency of the high-frequency inverter circuit, the forward signal is injected into the power carrier, the LCC resonance compensation topology transmits the power carrier carrying the FSK modulation signal from the forward transmitting end to the forward receiving end through the primary side induction transmission coil, and after the forward receiving end passes through the LCC resonance compensation topology and the rectifier circuit, the FSK demodulator is used to demodulate the original signal to complete the synchronous transmission of power and forward data; in the reverse data transmission stage, part of the power in the synchronous transmission stage of power and forward data is used as the modulation carrier, the reverse signal is ASK modulated by controlling the conduction state of the MOS tube by high and low levels, the SS resonance compensation topology is used as the data transmission channel, the ASK modulation signal is transmitted from the reverse transmitting end to the reverse receiving end through the secondary side induction transmission coil, and the ASK signal is demodulated at the reverse receiving end to complete the transmission of reverse data. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 It is a structural diagram of the working principle of the wireless power and bidirectional data parallel transmission system of the present invention;

[0066] Figure 2 It is an equivalent circuit diagram of the wireless power and bidirectional data parallel transmission method of the present invention;

[0067] Figure 3 It is a transmission coil structure of the wireless power and bidirectional data parallel transmission method of the present invention;

[0068] Figure 4 It is the total system equivalent circuit of the wireless power and bidirectional data parallel transmission method of the present invention;

[0069] Figure 5 It is a FSK modulation principle diagram of the wireless power and bidirectional data parallel transmission method of the present invention;

[0070] Figure 6 It is a forward data demodulation circuit diagram of the wireless power and bidirectional data parallel transmission method of the present invention;

[0071] Figure 7 It is a reverse ASK data signal modulation diagram of the wireless energy and bidirectional data parallel transmission method of the present invention;

[0072] Figure 8 It is the ASK modulation principle diagram of the wireless power and bidirectional data parallel transmission method of the present invention;

[0073] Fig. 9It is a reverse data demodulation circuit diagram of the wireless energy and bidirectional data parallel transmission method of the present invention;

[0074] Fig.10 It is a reverse data transmission channel equivalent circuit of the wireless power and bidirectional data parallel transmission method of the present invention. DETAILED DESCRIPTION

[0075] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following will be described clearly and completely with reference to the technical solutions in the accompanying drawings and preferred embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0076] This embodiment proposes a method for transmitting wireless energy and bidirectional data in parallel, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Fig.10 As shown, the following steps are included:

[0077] In the synchronous transmission stage of electric energy and forward data, the FSK frequency modulator modulates the forward signal and injects it into the electric energy carrier to obtain the FSK modulation signal. The LCC resonant compensation topology transmits the electric energy carrier carrying the FSK modulation signal from the forward transmitting end to the forward receiving end through the primary side forward induction transmission coil. The forward receiving end demodulates the FSK modulation signal to complete the synchronous transmission of electric energy and forward data. There are two working frequencies ω in the synchronous transmission stage of electric energy and forward data. p and ω d ;

[0078] In the reverse data transmission phase, the ASK modulator uses the power and the ω of the forward data synchronization transmission phase to d The electric energy reflux carried by the resonant frequency component is used as the modulated carrier, and the reverse signal is ASK modulated by controlling the conduction state of the MOS tube by high and low levels to obtain an ASK modulated signal. The SS resonant compensation topology is used as the data transmission channel, and the ASK modulated signal is transmitted from the reverse transmitting end to the reverse receiving end through the secondary side reverse induction transmission coil. The reverse receiving end demodulates the ASK modulated signal to complete the transmission of reverse data.

[0079] As a preferred technical solution, in this embodiment, Figure 1 , Figure 2 , Figure 3 , Figure 4 and Fig.10As shown, the synchronous transmission phase of the electric energy and the forward data includes a forward transmitting end and a forward receiving end, and the reverse data transmission phase includes a reverse transmitting end and a reverse receiving end, wherein the forward transmitting end and the reverse receiving end are the primary side, and the forward receiving end and the reverse transmitting end are the secondary side, wherein:

[0080] The forward transmitting end includes a DC power supply, a high-frequency inverter circuit, a transmitting end LCC resonant compensation topology, and a primary side forward induction transmission coil connected in sequence; the forward receiving end includes a secondary side forward induction transmission coil, a receiving end LCC resonant compensation topology, a rectifier circuit, and a load RL connected in sequence; the high-frequency inverter circuit is connected to an FSK modulator; the rectifier circuit is connected to an FSK demodulator; the synchronous transmission stage of the electric energy and the forward data has two operating frequencies, one of which is the inherent resonant frequency ω of the system p Determines the transmission rate, a resonant frequency ω d Used to adjust the system resonance state and for reverse data signal transmission; the FSK modulator modulates the working frequency of the high-frequency inverter circuit, injects the forward signal into the electric energy carrier, and the LCC resonant compensation topology at the transmitting end transmits the electric energy carrier carrying the FSK modulated signal to the forward receiving end through the primary side forward induction transmission coil; the secondary side forward induction transmission coil receives the electric energy carrier of the forward transmitting end, and after passing through the LCC resonant compensation topology and rectification circuit at the receiving end, the FSK demodulator demodulates the FSK modulated signal to complete the synchronous transmission of electric energy and forward data; a magnetic resonance coupling region is formed between the induction transmission coils;

[0081] The reverse transmitting end includes an ASK modulator, a transmitting end SS resonant compensation topology, and a secondary side reverse induction transmission coil connected in sequence; the reverse receiving end includes a primary side reverse induction transmission coil, a receiving end SS resonant compensation topology, and an ASK demodulator connected in sequence; the forward receiving end LCC resonant compensation topology and the reverse transmitting end SS resonant compensation topology are connected to the ASK modulator; the ASK modulator uses the ω of the synchronous transmission phase of electric energy and forward data d The electric energy reflux carried by the resonant frequency component is used as a modulated carrier, and the reverse signal is ASK modulated by controlling the conduction state of the MOS tube by high and low levels to obtain an ASK modulated signal; the SS resonant compensation topology at the transmitting end transmits the ASK modulated signal to the reverse receiving end through the secondary side reverse induction transmission coil; the primary side reverse induction transmission coil receives the ASK modulated signal sent by the reverse transmitting end, and after passing through the SS resonant compensation topology at the receiving end, the ASK demodulator demodulates the ASK signal to complete the transmission of reverse data.

[0082] As a preferred technical solution, in this embodiment, Figure 2As shown, the DC power supply is a DC voltage source; the high-frequency inverter circuit includes MOS tube Q1, MOS tube Q2, MOS tube Q3, and MOS tube Q4, and MOS tube Q1, MOS tube Q2, MOS tube Q3, and MOS tube Q4 are all connected to the FSK modulator; the ASK modulator includes MOS tube Q5, and MOS tube Q5 is connected to the forward receiving end LCC resonant compensation topology and the transmitting end SS resonant compensation topology.

[0083] As a preferred technical solution, in this embodiment, Figure 2 As shown, the rectifier circuit includes a diode D1, a diode D2, a diode D3, and a diode D4; the cathode of the diode D1 is connected to the cathode of the diode D3, the anode of the diode D2 is connected to the anode of the diode D4, the anode of the diode D1 is connected to the cathode of the diode D2, the anode of the diode D3 is connected to the cathode of the diode D4, the anode of the diode D1 and the cathode of the diode D4 serve as input ends of the rectifier circuit, and the cathode of the diode D3 and the anode of the diode D2 serve as output ends of the rectifier circuit; the rectifier circuit also includes a filter capacitor CL, which is a polar capacitor, the anode of the filter capacitor CL is connected to the cathode of the diode D3, and the cathode of the filter capacitor CL is connected to the anode of the diode D4.

[0084] As a preferred technical solution, in this embodiment, Figure 2 , Figure 3 , Figure 4 and Fig.10 As shown, in the synchronous transmission stage of electric energy and forward data, obtaining the maximum output power of electric energy includes the following steps:

[0085] ① The input and output power P of the system in the resonant state during the synchronous transmission stage of obtaining electric energy and forward data in and P o :

[0086]

[0087]

[0088] In formula (1), U dc is the DC input voltage of the system; in formula (2), R L is the actual resistance load; in formula (3), I t1 is the current of the primary side forward sending end loop; in formula (7), Z R is the reflected impedance at resonance;

[0089] ②According to Kirchhoff's voltage law, the working voltage and current relationship of each circuit is obtained:

[0090]

[0091] In formula (10), I t1 is the current of the primary side forward sending end loop; I r1 is the current of the secondary side positive receiving end loop; I r2 is the current of the reverse data sending end loop on the secondary side; I t2 is the current of the reverse data receiving end loop on the primary side; according to formula (10), the current value of each loop can be obtained as follows:

[0092]

[0093] ③ Obtain the maximum output power. The output power of the electric energy is affected by the mutual inductance M between the transmission coils and the load. Analyze the different values ​​of M and R dp The impact on system transmission is to design induction transmission coils of different sizes and structures so that the mutual inductance between the power resonant coupling mechanism and the signal resonant coupling mechanism approximately satisfies M1=M t11 =M t12 , M2=M t21 =M t22 , M=M t11 +Mt 12 =2M1; when R dp Much larger than R L When the output power P o is the maximum value, at this time P o for:

[0094]

[0095] In the formula, the voltage source U connected to the forward transmitting end is i ; The forward receiving end equivalent AC resistance R eq ; The equivalent impedance Z of the loop where the forward transmitting end power transmission system coil is located t1 ; The equivalent impedance Z of the forward receiving end power transmission system coil r1 The forward transmitting end LCC resonant compensation topology includes a compensation capacitor C connected in series with the primary side forward induction transmission coil ps , parallel compensation capacitor C connected in parallel with the primary side forward induction transmission coil pp , the series compensation inductor L connected in parallel with the primary side forward induction transmission coil ps The primary side forward induction transmission coil adopts an inductor L pp The forward receiving end LCC resonant compensation topology includes a compensation capacitor C connected in series with the secondary side forward induction transmission coil ss , parallel compensation capacitor C connected in parallel with the secondary side forward induction transmission coil sp , the series compensation inductor L connected in parallel with the secondary side forward induction transmission coil ssThe secondary side forward induction transmission coil adopts an inductor L sp ; The transmission frequency ω of the synchronous transmission phase of the electric energy and the forward data p ; The input and output power P of the system in the resonant state during the synchronous transmission phase of the electric energy and the forward data in and P o ;

[0096] The reverse transmitting end SS resonant compensation topology includes a compensation capacitor C connected in series with the secondary side reverse induction transmission coil. dp The secondary side reverse induction transmission coil adopts inductance L dp ; The reverse data sending end equivalent resistance R dp The reverse receiving end SS resonant compensation topology includes a compensation capacitor C connected in series with the primary side reverse induction transmission coil ds The primary side reverse induction transmission coil adopts inductance L ds ; The reverse data receiving end equivalent resistance R ds ; The equivalent impedance Z of the reverse data transmission circuit dp ; The total impedance Z of the loop where the reverse data sending end is located r2 ; The total impedance Z of the loop where the reverse data receiving end is located t2 The working resonant frequency of the reverse data transmission phase and the center frequency of the inductor resistor filter are ω d ;

[0097] The mutual inductance value M between the induction transmission coils t 、M t11 、M t12 、M r 、M t21 、M t22 ; The initial mutual inductance value M1 of the primary side forward induction transmission coil and the secondary side forward induction transmission coil; The initial mutual inductance value M2 of the secondary side reverse induction transmission coil and the primary side reverse induction transmission coil.

[0098] As a preferred technical solution, in this embodiment, Figure 2 , Figure 4 , Figure 5 and Figure 6 As shown, the FSK frequency modulator modulation and FSK demodulator demodulation in the synchronous transmission stage of the electric energy and the forward data specifically include the following steps:

[0099] ①The FSK modulator performs FSK modulation on the forward signal and then injects it into the high-frequency inverter circuit to provide the operating frequency for the system; after FSK modulation, the digital signal S FSK The expression of (t) modulation is:

[0100]

[0101] The specific modulation process is as follows:

[0102] a. When the digital signal at the receiving end is 1, the FSK modulator modulation circuit outputs a pulse with a frequency of f1;

[0103] b. When the digital signal at the receiving end is 0, the FSK modulation circuit outputs a pulse with a frequency of f2;

[0104] ② The LCC resonant compensation topology at the transmitting end transmits the power carrier carrying the FSK signal to the forward receiving end through the primary side forward induction transmission coil;

[0105] a. The forward receiving end receives the electric energy carrier with FSK signal to prevent excessive loss of electric energy and avoid damage to the subsequent demodulation network caused by excessive signal voltage amplitude. The wave blocking network is used to isolate the demodulation circuit from the electric energy transmission channel;

[0106] b. Use a diode envelope detector to filter out the power carrier and extract the voltage change envelope of the FSK modulated signal;

[0107] c. Use a low-pass filter to further filter out the high-frequency carrier and noise still contained in the signal;

[0108] d. After the two-stage voltage comparator performs shaping processing, the threshold voltage is set, and the original data signal is obtained through comparison and judgment to complete the signal demodulation process;

[0109] In order to ensure the reasonable and efficient operation of the system and avoid the transmission interference between power and reverse data, the transmission frequency ω of the synchronous transmission stage of power and forward data is p and the working resonant frequency of the reverse data transmission stage and the center frequency of the inductor resistor filter ω d The value interval is as large as possible, and the quality factor Q of this data transmission process is calculated in the resonant state. f and signal channel bandwidth Bw f , Q f and Bw f The expression is:

[0110]

[0111]

[0112] In formula (16), R d It is the equivalent internal resistance of the demodulation circuit, and is used to extract the forward data signal by voltage division. When the FSK modulator modulates and causes the frequency to change, the voltage envelope amplitude changes, and is used to perform envelope demodulation on the electric energy carrier voltage at the forward receiving end to restore the original signal.

[0113] As a preferred technical solution, in this embodiment, Figure 2 , Figure 4 , Figure 7 , Figure 8 , Fig. 9 and Fig.10 As shown, the ASK modulator modulation and the ASK demodulator demodulation in the reverse data transmission stage include the following steps:

[0114] The secondary side reverse induction transmission coil is added to the ASK modulation network, and the SS resonant compensation topology circuit is used as the data transmission channel. It is transmitted from the reverse sending end to the reverse receiving end through the secondary side induction transmission coil; the working resonant frequency of the reverse data transmission stage and the center frequency ω of the inductor resistance filter are used. d The electric energy reflux carried by the resonant frequency component is used as a modulated carrier to realize reverse ASK signal transmission by controlling the conduction state of the MOS tube through high and low levels; the ASK modulated signal maintains the working resonant frequency of the reverse data transmission stage and the center frequency ω of the inductor resistance filter d The voltage amplitude changes with the change of the modulated digital signal; the baseband data signal pulse S after ASK demodulator modulation ASK (t) is expressed as:

[0115] S ASK (t)=S(t)cos(2πf1t)0≤t≤T (17)

[0116] The specific modulation process is as follows:

[0117] a. When the digital signal is at a high level of "1", the MOS tube is turned on, and the electric energy carrier flows through the band-stop filter and then flows to the ground through the MOS tube;

[0118] b. When the digital signal is at a low level of "0", the MOS tube is cut off, and the power carrier passes through the band-stop filter and is resonantly coupled to the data receiving end through the resonant circuit;

[0119] c. The electric energy carrier is transmitted to the reverse receiving end through the resonant circuit after passing through the resistor; the total impedance of the reverse transmitting end and the receiving end is:

[0120]

[0121] The quality factor Qr is calculated based on the system circuit:

[0122]

[0123] The communication bandwidth Bw for reverse data transmission can be calculated from the bandwidth formula: r for:

[0124]

[0125] d. The reverse receiving end receives the ASK modulated signal and uses a diode envelope detector to extract the voltage change envelope of the ASK modulated signal;

[0126] e. Use a low-pass filter to further filter out the high-frequency carrier and noise still contained in the signal, so as to more accurately restore the baseband signal;

[0127] f. After being shaped by a two-stage voltage comparator, the original data signal is obtained by setting the threshold voltage and comparing and judging, completing the ASK modulated signal demodulation process.

[0128] As a preferred technical solution, the present invention also provides a wireless power and bidirectional data parallel transmission system, the technical solution is as follows:

[0129] A wireless power and bidirectional data parallel transmission system, comprising a synchronous transmission module for power and forward data, which is used to modulate a forward signal and inject it into a power carrier to obtain an FSK modulation signal, and an LCC resonant compensation topology transmits the power carrier carrying the FSK modulation signal from a forward transmitting end to a forward receiving end through a primary side forward induction transmission coil, and the forward receiving end demodulates the FSK modulation signal to complete the synchronous transmission of power and forward data;

[0130] The reverse data transmission module is used to use the electric energy return flow in the synchronous transmission stage of electric energy and forward data as the modulation carrier, perform ASK modulation on the reverse signal by controlling the conduction state of the MOS tube by high and low levels to obtain an ASK modulated signal, use the SS resonant compensation topology as the data transmission channel, and transmit the ASK modulated signal from the reverse transmitting end to the reverse receiving end through the secondary side reverse induction transmission coil. The reverse receiving end demodulates the ASK modulated signal to complete the transmission of reverse data.

[0131] As a preferred technical solution, in one embodiment, the synchronous transmission module of electric energy and forward data includes a forward transmitting end and a forward receiving end, and the reverse data transmission module includes a reverse transmitting end and a reverse receiving end, the forward transmitting end and the reverse receiving end are the primary side, and the forward receiving end and the reverse transmitting end are the secondary side, wherein:

[0132] The forward transmitting end includes a DC power supply, a high-frequency inverter circuit, a transmitting end LCC resonant compensation topology, and a primary side forward induction transmission coil connected in sequence; the forward receiving end includes a secondary side forward induction transmission coil, a receiving end LCC resonant compensation topology, a rectifier circuit, and a load RL connected in sequence; the high-frequency inverter circuit is connected to an FSK modulator; the rectifier circuit is connected to an FSK demodulator; the FSK modulator modulates the working frequency of the high-frequency inverter circuit and injects the forward signal into the electric energy carrier, and the transmitting end LCC resonant compensation topology transmits the electric energy carrier carrying the FSK modulated signal to the forward receiving end through the primary side forward induction transmission coil; the secondary side forward induction transmission coil receives the electric energy carrier of the forward transmitting end, and after passing through the receiving end LCC resonant compensation topology and the rectifier circuit, the FSK demodulator demodulates the FSK modulated signal to complete the synchronous transmission of electric energy and forward data;

[0133] The reverse transmitting end includes an ASK modulator, a transmitting end SS resonant compensation topology, and a secondary side reverse induction transmission coil connected in sequence; the reverse receiving end includes a primary side reverse induction transmission coil, a receiving end SS resonant compensation topology, and an ASK demodulator connected in sequence; the forward receiving end LCC resonant compensation topology is connected to the ASK modulator; the ASK modulator uses the electric energy return in the synchronous transmission stage of electric energy and forward data as the modulation carrier, and performs ASK modulation on the reverse signal by controlling the conduction state of the MOS tube by high and low levels to obtain an ASK modulated signal; the transmitting end SS resonant compensation topology transmits the ASK modulated signal to the reverse receiving end through the secondary side reverse induction transmission coil; the primary side reverse induction transmission coil receives the ASK modulated signal emitted by the reverse transmitting end, and after passing through the receiving end SS resonant compensation topology, the ASK demodulator demodulates the ASK signal to complete the transmission of reverse data.

[0134] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A method for parallel transmission of wireless energy and bidirectional data, characterized in that: The steps include: In the synchronous transmission stage of electric energy and forward data, the FSK frequency modulator modulates the forward signal and injects it into the electric energy carrier to obtain the FSK modulated signal. The LCC resonant compensation topology transmits the electric energy carrier carrying the FSK modulated signal from the forward transmitting end to the forward receiving end through the primary side forward induction transmission coil. The forward receiving end demodulates the FSK modulated signal to complete the synchronous transmission of electric energy and forward data. In the reverse data transmission stage, the ASK modulator uses the electric energy return flow in the synchronous transmission stage of electric energy and forward data as the modulation carrier, and performs ASK modulation on the reverse signal by controlling the conduction state of the MOS tube by high and low levels to obtain an ASK modulated signal. The SS resonant compensation topology is used as the data transmission channel, and the ASK modulated signal is transmitted from the reverse transmitting end to the reverse receiving end through the reverse induction transmission coil on the secondary side. The reverse receiving end demodulates the ASK modulated signal to complete the transmission of reverse data.

2. The method according to claim 1, characterized in that The synchronous transmission phase of electric energy and forward data includes a forward transmitting end and a forward receiving end, and the reverse data transmission phase includes a reverse transmitting end and a reverse receiving end, wherein the forward transmitting end and the reverse receiving end are the primary side, and the forward receiving end and the reverse transmitting end are the secondary side, wherein: The forward transmitting end includes a DC power supply, a high-frequency inverter circuit, a transmitting end LCC resonant compensation topology, and a primary side forward induction transmission coil connected in sequence; the forward receiving end includes a secondary side forward induction transmission coil, a receiving end LCC resonant compensation topology, a rectifier circuit, and a load RL connected in sequence; the high-frequency inverter circuit is connected to an FSK modulator; the rectifier circuit is connected to an FSK demodulator; the FSK modulator modulates the working frequency of the high-frequency inverter circuit and injects the forward signal into the electric energy carrier, and the transmitting end LCC resonant compensation topology transmits the electric energy carrier carrying the FSK modulated signal to the forward receiving end through the primary side forward induction transmission coil; the secondary side forward induction transmission coil receives the electric energy carrier of the forward transmitting end, and after passing through the receiving end LCC resonant compensation topology and the rectifier circuit, the FSK demodulator demodulates the FSK modulated signal to complete the synchronous transmission of electric energy and forward data; The reverse transmitting end includes an ASK modulator, a transmitting end SS resonant compensation topology, and a secondary side reverse induction transmission coil connected in sequence; the reverse receiving end includes a primary side reverse induction transmission coil, a receiving end SS resonant compensation topology, and an ASK demodulator connected in sequence; the forward receiving end LCC resonant compensation topology is connected to the ASK modulator; the ASK modulator uses the electric energy return in the synchronous transmission stage of electric energy and forward data as the modulation carrier, and performs ASK modulation on the reverse signal by controlling the conduction state of the MOS tube by high and low levels to obtain an ASK modulated signal; the transmitting end SS resonant compensation topology transmits the ASK modulated signal to the reverse receiving end through the secondary side reverse induction transmission coil; the primary side reverse induction transmission coil receives the ASK modulated signal emitted by the reverse transmitting end, and after passing through the receiving end SS resonant compensation topology, the ASK demodulator demodulates the ASK signal to complete the transmission of reverse data.

3. The method according to claim 2, characterized in that The DC power supply is a DC voltage source; the high-frequency inverter circuit includes MOS tubes Q1, Q2, Q3 and Q4, and MOS tubes Q1, Q2, Q3 and Q4 are all connected to the FSK modulator; the ASK modulator includes MOS tube Q5, and MOS tube Q5 is connected to the forward receiving end LCC resonant compensation topology and the transmitting end SS resonant compensation topology.

4. The method according to claim 2, characterized in that: The rectifier circuit includes a diode D1, a diode D2, a diode D3, and a diode D4; the cathode of the diode D1 is connected to the cathode of the diode D3, the anode of the diode D2 is connected to the anode of the diode D4, the anode of the diode D1 is connected to the cathode of the diode D2, the anode of the diode D3 is connected to the cathode of the diode D4, the anode of the diode D1 and the cathode of the diode D4 serve as input ends of the rectifier circuit, and the cathode of the diode D3 and the anode of the diode D2 serve as output ends of the rectifier circuit; the rectifier circuit also includes a filter capacitor CL, which is a polar capacitor, the anode of the filter capacitor CL is connected to the cathode of the diode D3, and the cathode of the filter capacitor CL is connected to the anode of the diode D4.

5. The method according to claim 2, characterized in that: In the synchronous transmission stage of electric energy and forward data, obtaining the maximum output power of electric energy includes the following steps: ① The input and output power P of the system in the resonant state during the synchronous transmission stage of obtaining electric energy and forward data in and P o : In formula (1), U dc is the DC input voltage of the system; in formula (2), R L is the actual resistance load; in formula (3), I t1 is the current of the primary side forward sending end loop; in formula (7), Z R is the reflected impedance at resonance; ②According to Kirchhoff's voltage law, the working voltage and current relationship of each circuit is obtained: In formula (10), I t1 is the current of the primary side forward sending end loop; I r1 is the current of the secondary side positive receiving end loop; I r2 is the current of the reverse data sending end loop on the secondary side; I t2 is the current of the reverse data receiving end loop on the primary side; according to formula (10), the current value of each loop can be obtained as follows: ③ Obtain the maximum output power. The output power of the electric energy is affected by the mutual inductance M between the transmission coils and the load. Analyze the different values ​​of M and R dp The impact on system transmission is to design induction transmission coils of different sizes and structures so that the mutual inductance between the power resonant coupling mechanism and the signal resonant coupling mechanism approximately satisfies M1=M t11 =M t12 , M2=M t21 =M t22 , M=M t11 +Mt 12 =2M1; when R dp Much larger than R L When the output power P o is the maximum value, at this time P o for: In the formula, the voltage source U connected to the forward transmitting end is i ; The forward receiving end equivalent AC resistance R eq ; The equivalent impedance Z of the loop where the forward transmitting end power transmission system coil is located t1 ; The equivalent impedance Z of the forward receiving end power transmission system coil r1 The forward transmitting end LCC resonant compensation topology includes a compensation capacitor C connected in series with the primary side forward induction transmission coil ps , parallel compensation capacitor C connected in parallel with the primary side forward induction transmission coil pp , the series compensation inductor L connected in parallel with the primary side forward induction transmission coil ps The primary side forward induction transmission coil adopts an inductor L pp The forward receiving end LCC resonant compensation topology includes a compensation capacitor C connected in series with the secondary side forward induction transmission coil ss , parallel compensation capacitor C connected in parallel with the secondary side forward induction transmission coil sp , the series compensation inductor L connected in parallel with the secondary side forward induction transmission coil ss The secondary side forward induction transmission coil adopts an inductor L sp ; The transmission frequency ω of the synchronous transmission phase of the electric energy and the forward data p ; The input and output power P of the system in the resonant state during the synchronous transmission phase of the electric energy and the forward data in and P o ; The reverse transmitting end SS resonant compensation topology includes a compensation capacitor C connected in series with the secondary side reverse induction transmission coil. dp The secondary side reverse induction transmission coil adopts an inductor L dp ; The reverse data sending end equivalent resistance R dp The reverse receiving end SS resonant compensation topology includes a compensation capacitor C connected in series with the primary side reverse induction transmission coil ds The primary side reverse induction transmission coil adopts inductance L ds ; The reverse data receiving end equivalent resistance R ds ; The equivalent impedance Z of the reverse data transmission circuit dp ; The total impedance Z of the loop where the reverse data sending end is located r2 ; The total impedance Z of the loop where the reverse data receiving end is located t2 The working resonant frequency of the reverse data transmission phase and the center frequency of the inductor resistor filter are ω d ; The mutual inductance value M between the induction transmission coils t 、M t11 、M t12 、M r 、M t21 、M t22 ; The initial mutual inductance value M1 of the primary side forward induction transmission coil and the secondary side forward induction transmission coil; The initial mutual inductance value M2 of the secondary side reverse induction transmission coil and the primary side reverse induction transmission coil.

6. The method according to claim 2, characterized in that The FSK frequency modulator modulation and FSK demodulator demodulation in the synchronous transmission stage of the electric energy and the forward data specifically include the following steps: The FSK modulator performs FSK modulation on the forward signal and injects the forward signal into the electric energy carrier. The LCC resonant compensation topology transmits the electric energy carrier carrying the FSK modulation signal from the forward transmitting end to the forward receiving end through the primary side forward induction transmission coil. The forward receiving end demodulates the FSK modulation signal to complete the synchronous transmission of electric energy and forward data. After FSK modulation, the digital signal S FSK The expression of (t) modulation is: The specific modulation process is as follows: a. When the digital signal at the receiving end is 1, the FSK modulator modulation circuit outputs a pulse with a frequency of f1; b. When the digital signal at the receiving end is 0, the FSK modulation circuit outputs a pulse with a frequency of f2; c. The LCC resonant compensation topology at the transmitting end transmits the power carrier carrying the FSK signal to the forward receiving end through the primary side forward induction transmission coil; d. The forward receiving end receives the electric energy carrier with FSK signal to prevent excessive loss of electric energy and avoid damage to the subsequent demodulation network caused by excessive signal voltage amplitude. The wave blocking network is used to isolate the demodulation circuit from the electric energy transmission channel; e. Use a diode envelope detector to filter out the power carrier and extract the voltage change envelope of the FSK modulated signal; f. Further filter out the high-frequency carrier and noise still contained in the signal through a low-pass filter; g. After the two-stage voltage comparator performs shaping processing, the original data signal is obtained by setting the threshold voltage and comparing and judging, completing the signal demodulation process; Among them, there are two working frequencies ω in the synchronous transmission stage of power and forward data. p and ω d ,ω p The natural resonant frequency of the system determines the transmission rate; ω d It is used to adjust the system resonance state and for reverse data signal transmission, that is, the working resonance frequency of the reverse data transmission stage and the center frequency of the inductor resistance filter. In order to ensure that the system works reasonably and efficiently and avoids interference between power and reverse data transmission, ω p and ω d The value interval is as large as possible, and the quality factor Q of this data transmission process is calculated in the resonant state. f and signal channel bandwidth Bw f , Q f and Bw f The expression is: In formula (16), R d It is the equivalent internal resistance of the demodulation circuit, and is used to extract the forward data signal by voltage division. When the FSK modulator modulates and causes the frequency to change, the voltage envelope amplitude changes, and is used to perform envelope demodulation on the electric energy carrier voltage at the forward receiving end to restore the original signal.

7. The method according to claim 2, characterized in that The ASK modulator modulation and the ASK demodulator demodulation in the reverse data transmission stage include the following steps: The secondary side reverse induction transmission coil is added to the ASK modulation network, and the SS resonant compensation topology circuit is used as the data transmission channel, which is transmitted from the reverse transmitting end to the reverse receiving end through the secondary side induction transmission coil; The working resonant frequency of the reverse data transmission phase and the center frequency ω of the inductor resistor filter d The electric energy reflux carried by the resonant frequency component is used as a modulated carrier to realize reverse ASK signal transmission by controlling the conduction state of the MOS tube through high and low levels; the ASK modulated signal maintains the working resonant frequency of the reverse data transmission stage and the center frequency ω of the inductor resistance filter d The voltage amplitude changes with the change of the modulated digital signal; the baseband data signal pulse S after ASK demodulator modulation ASK (t) is expressed as: S ASK (t)=S(t)cos(2πf1t)0≤t≤T (17) The specific modulation process is as follows: a. When the digital signal is "1" high level, the MOS tube is turned on, and the power carrier flows through the band-stop filter and then flows to the ground through the MOS tube; b. When the digital signal is at a low level of "0", the MOS tube is cut off, and the power carrier passes through the band-stop filter and then couples to the data receiving end through the resonant circuit; c. The electric energy carrier is transmitted to the reverse receiving end through the resonant circuit after passing through the resistor; the total impedance of the reverse transmitting end and the receiving end is: The quality factor Qr is calculated based on the system circuit: The communication bandwidth Bw for reverse data transmission can be calculated from the bandwidth formula: r for: d. The reverse receiving end receives the ASK modulated signal and uses a diode envelope detector to extract the voltage change envelope of the ASK modulated signal; e. Use a low-pass filter to further filter out the high-frequency carrier and noise still contained in the signal, so as to more accurately restore the baseband signal; f. After being shaped by a two-stage voltage comparator, the original data signal is obtained by setting the threshold voltage and comparing and judging, completing the ASK modulated signal demodulation process.

8. A wireless power and bidirectional data parallel transmission system, characterized in that: It includes a synchronous transmission module for electric energy and forward data, which is used to modulate the forward signal and inject it into the electric energy carrier to obtain an FSK modulation signal. The LCC resonant compensation topology transmits the electric energy carrier carrying the FSK modulation signal from the forward transmitting end to the forward receiving end through the primary side forward induction transmission coil. The forward receiving end demodulates the FSK modulation signal to complete the synchronous transmission of electric energy and forward data. The reverse data transmission module is used to use the electric energy return flow in the synchronous transmission stage of electric energy and forward data as the modulation carrier, perform ASK modulation on the reverse signal by controlling the conduction state of the MOS tube by high and low levels to obtain an ASK modulated signal, use the SS resonant compensation topology as the data transmission channel, and transmit the ASK modulated signal from the reverse transmitting end to the reverse receiving end through the secondary side reverse induction transmission coil. The reverse receiving end demodulates the ASK modulated signal to complete the transmission of reverse data.

9. The system according to claim 7, characterized in that The synchronous transmission module of electric energy and forward data includes a forward transmitting end and a forward receiving end, and the reverse data transmission module includes a reverse transmitting end and a reverse receiving end, wherein the forward transmitting end and the reverse receiving end are the primary side, and the forward receiving end and the reverse transmitting end are the secondary side, wherein: The forward transmitting end includes a DC power supply, a high-frequency inverter circuit, a transmitting end LCC resonant compensation topology, and a primary side forward induction transmission coil connected in sequence; the forward receiving end includes a secondary side forward induction transmission coil, a receiving end LCC resonant compensation topology, a rectifier circuit, and a load RL connected in sequence; the high-frequency inverter circuit is connected to an FSK modulator; the rectifier circuit is connected to an FSK demodulator; the FSK modulator modulates the working frequency of the high-frequency inverter circuit and injects the forward signal into the electric energy carrier, and the transmitting end LCC resonant compensation topology transmits the electric energy carrier carrying the FSK modulated signal to the forward receiving end through the primary side forward induction transmission coil; the secondary side forward induction transmission coil receives the electric energy carrier of the forward transmitting end, and after passing through the receiving end LCC resonant compensation topology and the rectifier circuit, the FSK demodulator demodulates the FSK modulated signal to complete the synchronous transmission of electric energy and forward data; The reverse transmitting end includes an ASK modulator, a transmitting end SS resonant compensation topology, and a secondary side reverse induction transmission coil connected in sequence; the reverse receiving end includes a primary side reverse induction transmission coil, a receiving end SS resonant compensation topology, and an ASK demodulator connected in sequence; the forward receiving end LCC resonant compensation topology is connected to the ASK modulator; the ASK modulator uses the electric energy return in the synchronous transmission stage of electric energy and forward data as the modulation carrier, and performs ASK modulation on the reverse signal by controlling the conduction state of the MOS tube by high and low levels to obtain an ASK modulated signal; the transmitting end SS resonant compensation topology transmits the ASK modulated signal to the reverse receiving end through the secondary side reverse induction transmission coil; the primary side reverse induction transmission coil receives the ASK modulated signal emitted by the reverse transmitting end, and after passing through the receiving end SS resonant compensation topology, the ASK demodulator demodulates the ASK signal to complete the transmission of reverse data.

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