A method and system for parallel transmission of wireless energy and bidirectional data

Abstract

The present invention provides a method and system for the parallel transmission of wireless power and bidirectional data. This method injects a forward signal into an electric energy carrier. An LCC resonant compensation topology transmits the electric energy carrier carrying an FSK modulated signal from a forward transmitting end to a forward receiving end. At the forward receiving end, after passing through the LCC resonant compensation topology and a rectifier circuit, an FSK demodulator is used to demodulate the original signal, completing the synchronous transmission of the electric energy and forward data. A portion of the electric energy during the synchronous transmission phase of the electric energy and forward data is used as the modulated carrier. ASK modulation is performed on the reverse signal by controlling the conduction state of a MOS transistor using high and low levels. Using an SS resonant compensation topology as the data transmission channel, the ASK modulated signal is transmitted from the reverse transmitting end to the reverse receiving end. ASK signal demodulation is performed at the reverse receiving end to complete the transmission of the reverse data. This invention achieves the parallel transmission of bidirectional data while ensuring good power 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 rapid development of electrification, efficient power transmission and information exchange have become a primary goal of electrification. Traditional, limited-range transmission systems, as the number of products increases, lead to a tangled web of wires, increasing maintenance costs. Due to the lack of standardized standards for chargers, wires, and sockets, moving and plugging chargers can lead to safety incidents and environmental pollution.

[0003] Existing wireless transmission mainly includes three methods: wireless communication modules, independent channels and shared channels. When the wireless communication module uses Bluetooth and mobile communication technologies 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 additional coils, the system volume 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] To address the shortcomings of existing technologies, the present invention adds an FSK data signal modulation power wave circuit and a demodulation circuit to achieve synchronous transmission of power and forward data during the synchronous transmission phase. During the reverse data transmission phase, an ASK modulation and demodulation circuit and an SS resonant compensation topology transmission channel are added to achieve reverse data transmission. This achieves parallel transmission of power and bidirectional data without compromising power transmission quality.

[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, comprising the following steps:

[0007] During the synchronous transmission of power and forward data, the FSK frequency modulator modulates the forward signal and injects it into the power carrier to obtain an FSK modulated signal. The LCC resonant compensation topology transmits the power 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 power and forward data.

[0008] In the reverse data transmission stage, the ASK modulator uses the electric energy return 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 secondary side reverse induction transmission coil. The reverse receiving end demodulates the ASK modulated signal to complete the transmission of the reverse data.

[0009] Furthermore, 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:

[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 forward data has two operating frequencies, one of which is the system's natural resonant frequency ω 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 and injects the forward signal into the power carrier. The LCC resonant compensation topology on the transmitting end transmits the power 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 power carrier from the forward transmitting end, and after passing through the LCC resonant compensation topology and rectification circuit on the receiving end, the FSK demodulator demodulates the FSK modulated signal to complete the synchronous transmission of power 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 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.

[0012] Furthermore, the DC power supply is a DC voltage source; the high-frequency inverter circuit includes MOS transistors Q1, MOS transistors Q2, MOS transistors Q3, and MOS transistors Q4, and MOS transistors Q1, MOS transistors Q2, MOS transistors Q3, and MOS transistors Q4 are all connected to the FSK modulator; the ASK modulator includes MOS transistor Q5, and MOS transistor 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 the input end of the rectifier circuit, and the cathode of the diode D3 and the anode of the diode D2 serve as the output end of the rectifier circuit; the rectifier circuit also includes a filter capacitor CL, which is a polarized 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, during the synchronous transmission phase of electric energy and forward data, obtaining the maximum output power of 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 phase 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 secondary side reverse data sending end loop; 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 is:

[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 influence of system transmission is to design induction transmission coils of different sizes and structures so that the mutual inductance between the power resonance coupling mechanism and the signal resonance 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 sending 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 inductance 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 inductance L sp The transmission frequency of the synchronous transmission phase of the electric energy and forward data ω 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 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 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 reverse data sending end where the loop 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 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 power carrier. The LCC resonant 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 forward induction transmission coil. The forward receiving end demodulates the FSK modulation signal to complete the synchronous transmission of power 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 power carrier with the FSK signal to prevent excessive power loss and avoid damage to the subsequent demodulation network caused by excessive signal voltage amplitude. A wave blocking network is used to isolate the demodulation circuit from the power 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 to complete 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 resonant frequency of the reverse data transmission stage and the center frequency of the inductor resistor filter. In order to ensure the reasonable and efficient operation of the system and avoid the transmission interference of power and reverse data, 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 divide the voltage and extract the forward data signal. When the FSK modulator modulates the frequency, the voltage envelope amplitude changes, which is used to perform envelope demodulation on the power 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. The reverse transmission end is transmitted 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 of the inductor resistor filter ω 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-resistor 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 power 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. After passing through the resistor, the electric energy carrier is transmitted to the reverse receiving end through the resonant circuit; 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 shaping processing by 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 of which is as follows:

[0058] A wireless power and bidirectional data parallel transmission system, characterized by including 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 modulated signal. An LCC resonant compensation topology transmits the power carrier carrying the FSK modulated signal from a forward transmitting end to a forward receiving end through a primary-side forward induction transmission coil. The forward receiving end demodulates the FSK modulated 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 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, 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:

[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 operating frequency of the high-frequency inverter circuit and injects a 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 from 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 beneficial effects of the technical solution of the present invention are:

[0064] The present invention provides a method for wireless parallel transmission of power and bidirectional data. While ensuring good power transmission characteristics, the method achieves bidirectional parallel transmission of data, including synchronous transmission of power and forward data, and reverse data transmission. During the synchronous transmission of power and forward data, FSK frequency modulation technology is used to modulate the operating frequency of a high-frequency inverter circuit, a forward signal is injected into the power carrier, and an LCC resonant compensation topology transmits the power carrier carrying the FSK modulated signal from a forward transmitting end to a forward receiving end via a primary-side inductive transmission coil. At the forward receiving end, after passing through the LCC resonant compensation topology and a rectifier circuit, an FSK demodulator is used to demodulate the original signal, completing the synchronous transmission of power and forward data. During the reverse data transmission phase, a portion of the power used in the synchronous transmission of power and forward data is used as a modulation carrier. ASK modulation is performed on the reverse signal by controlling the conduction state of a MOS transistor using high and low levels. An SS resonant compensation topology is used as a data transmission channel. The ASK modulated signal is transmitted from the reverse transmitting end to the reverse receiving end via a secondary-side inductive transmission coil. The ASK signal is demodulated at the reverse receiving end, completing the transmission of reverse data. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 This 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 The invention relates to a transmission coil structure for a wireless power and bidirectional data parallel transmission method.

[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 This is a schematic diagram of the FSK modulation principle of the wireless power and bidirectional data parallel transmission method of the present invention;

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

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

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

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

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

[0075] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the following will provide a clear and complete description of the technical solutions in the preferred embodiments with reference to the accompanying drawings. 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 shall fall 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 Figure 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 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. 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 transmits power synchronously with the forward data. d The electric energy reflux carried by the resonant frequency component is used as the modulation 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 Figure 10As shown, 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:

[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 forward data has two operating frequencies, one of which is the system's natural resonant frequency ω 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 power carrier, and the LCC resonant compensation topology on the transmitting end transmits the power 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 power carrier of the forward transmitting end, and after passing through the LCC resonant compensation topology and rectification circuit on the receiving end, the FSK demodulator demodulates the FSK modulated signal to complete the synchronous transmission of power 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 resonance 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 resonance compensation topology, and an ASK demodulator connected in sequence; the forward receiving end LCC resonance compensation topology and the reverse transmitting end SS resonance compensation topology are connected to the ASK modulator; the ASK modulator uses the ω d The electric energy return 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 emitted 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 transistors Q1, Q2, Q3, and Q4, and the MOS transistors Q1, Q2, Q3, and Q4 are all connected to the FSK modulator; the ASK modulator includes a MOS transistor Q5, and the MOS transistor Q5 is connected to the LCC resonant compensation topology at the forward receiving end and the SS resonant compensation topology at the transmitting end.

[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 polarized 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 Figure 10 As shown, during the synchronous transmission phase 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 phase 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 secondary side reverse data sending end loop; 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 is:

[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 influence of system transmission is to design induction transmission coils of different sizes and structures so that the mutual inductance between the power resonance coupling mechanism and the signal resonance 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 sending 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 inductance 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 inductance L sp The transmission frequency of the synchronous transmission phase of the electric energy and forward data ω 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 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 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 reverse data sending end where the loop 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 power carrier with FSK signal to prevent excessive power loss and avoid the damage of the subsequent demodulation network caused by excessive signal voltage amplitude. The wave blocking network is used to isolate the demodulation circuit and the power 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. Further filter out the high-frequency carrier and noise still contained in the signal through a low-pass filter;

[0108] d. 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;

[0109] In order to ensure that the system works reasonably and efficiently and avoid the transmission interference between power and reverse data, the transmission frequency ω of the synchronous transmission phase 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 divide the voltage and extract the forward data signal. When the FSK modulator modulates the frequency, the voltage envelope amplitude changes, which is used to perform envelope demodulation on the power 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 、 Figure 9 and Figure 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. The reverse transmission end is transmitted 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 of the inductor resistor filter ω 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-resistor 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 power 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. After passing through the resistor, the electric energy carrier is transmitted to the reverse receiving end through the resonant circuit; 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 shaping processing by 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 includes 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 modulated signal. An LCC resonant compensation topology transmits the power carrier carrying the FSK modulated signal from a forward transmitting end to a forward receiving end through a primary-side forward induction transmission coil. The forward receiving end demodulates the FSK modulated 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 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, 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:

[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 operating frequency of the high-frequency inverter circuit and injects a 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 from 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 above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions 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 description of the present invention.

Claims

1. A method for parallel transmission of wireless energy and bidirectional data, characterized in that: The steps include: During the synchronous transmission of power and forward data, the FSK frequency modulator modulates the forward signal and injects it into the power carrier to obtain an FSK modulated signal. The LCC resonant compensation topology transmits the power 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 power 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 secondary side reverse induction transmission coil. The reverse receiving end demodulates the ASK modulated signal to complete the transmission of reverse data; 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 Used to adjust the system resonance state and for reverse data signal transmission, that is, the working resonant frequency in the reverse data transmission phase and the center frequency of the inductor-resistor filter; 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. The reverse transmission end is transmitted 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 of the inductor resistor filter ω 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-resistor filter. d The voltage amplitude changes with the modulated digital signal.

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 primary sides, and the forward receiving end and the reverse transmitting end are secondary sides, 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 operating frequency of the high-frequency inverter circuit and injects a 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 from 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 transistors Q1, MOS transistors Q2, MOS transistors Q3, and MOS transistors Q4, and MOS transistors Q1, MOS transistors Q2, MOS transistors Q3, and MOS transistors Q4 are all connected to the FSK modulator; the ASK modulator includes a MOS transistor Q5, and MOS transistor 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 polarized 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 During the synchronous transmission of electric energy and forward data, the maximum output power of electric energy is obtained through the following steps: ① The input and output power P of the system in the resonant state during the synchronous transmission phase 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 secondary side reverse data sending end loop; 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 is: 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 influence of system transmission is to design induction transmission coils of different sizes and structures so that the mutual inductance between the power resonance coupling mechanism and the signal resonance 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 sending 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 inductance 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 inductance L sp The transmission frequency of the synchronous transmission phase of the electric energy and forward data ω 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 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 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 reverse data sending end where the loop 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 5, 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 modulates the forward signal and injects the forward signal into the power carrier. The LCC resonant compensation topology transmits the power 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 power 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 power carrier with the FSK signal to prevent excessive power loss and avoid damage to the subsequent demodulation network caused by excessive signal voltage amplitude. A wave blocking network is used to isolate the demodulation circuit from the power 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 to complete the signal demodulation process; Among them, in order to ensure the reasonable and efficient operation of the system and avoid the transmission interference of power and reverse data, 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 divide the voltage and extract the forward data signal. When the FSK modulator modulates the frequency, the voltage envelope amplitude changes, which is used to perform envelope demodulation on the power carrier voltage at the forward receiving end to restore the original signal.

7. The method according to claim 6, characterized in that The ASK modulator modulation and the ASK demodulator demodulation in the reverse data transmission stage include the following steps: The baseband data signal pulse S modulated by the ASK demodulator 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 is resonantly coupled to the data receiving end through the resonant circuit; c. After passing through the resistor, the electric energy carrier is transmitted to the reverse receiving end through the resonant circuit; 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 shaping processing by 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 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. The reverse data transmission module is used to use the electric energy return during the synchronous transmission phase of electric energy and forward data as a modulation carrier, perform ASK modulation on the reverse signal by controlling the conduction state of the MOS tube by high and low levels, 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; 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 Used to adjust the system resonance state and for reverse data signal transmission, that is, the working resonant frequency in the reverse data transmission phase and the center frequency of the inductor-resistor filter; 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. The reverse transmission end is transmitted 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 of the inductor resistor filter ω 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-resistor filter. d The voltage amplitude changes with the modulated digital signal.

9. The system according to claim 8, 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. 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 operating frequency of the high-frequency inverter circuit and injects a 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 from 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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