Wireless power and data synchronous transmission system and method with high-speed half-duplex communication

Abstract

The invention discloses a wireless power and data synchronous transmission system and method with high-speed half-duplex communication, and the system comprises a power transmission channel which is used for converting an input DC power supply into DC voltage, outputting the DC voltage to an external load, filtering out higher harmonics in the power transmission channel through employing a bilateral LLCC compensation topology method, and outputting the DC voltage to the external load; common-mode current in a power transmission channel is suppressed, and zero-voltage switching is realized at the same time; the data transmission channel adopts an amplitude-shift keying modulation and demodulation method and is used for injecting or extracting a high-frequency carrier signal so as to restore the high-frequency carrier signal to an original baseband signal and realize half-duplex communication; wherein the power transmission channel and the data transmission channel share a pair of coupling coils with taps and ferrite cores. According to the invention, additional wave traps and coupling coils are not needed, the system cost and size are reduced, the data rate and the electric energy transmission efficiency can be considered, and the method can be widely applied to the technical field of electric power and data transmission.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power and data transmission, and in particular to a wireless power and data synchronous transmission system and method with high-speed half-duplex communication. BACKGROUND

[0002] The wireless power and data synchronous transmission (SWPDT) system has wide application in the fields of robots, smart homes and electric vehicles. In the related prior art, power and data transmission often uses separate coils or additional traps, resulting in increased system cost, increased size, and susceptibility to interference, and it is difficult to balance data rate and power transmission efficiency (PTE). SUMMARY

[0003] To solve the above technical problems, the purpose of the present application is to provide a wireless power and data synchronous transmission system and method with high-speed half-duplex communication, which can reduce cost and improve data rate and power transmission efficiency.

[0004] To achieve the above purpose, one aspect of an embodiment of the present application proposes a wireless power and data synchronous transmission system with high-speed half-duplex communication, comprising:

[0005] A power transmission channel is used to convert an input DC power supply into a DC voltage, and then output the DC voltage to an external load, and a double-sided LLCC compensation topology method is used to filter out high-order harmonics in the power transmission channel, suppress common-mode current in the power transmission channel, and realize zero-voltage switching at the same time;

[0006] A data transmission channel uses amplitude shift keying modulation and demodulation method to inject or extract high-frequency carrier signals, and then restores the high-frequency carrier signals to the original baseband signals to realize half-duplex communication;

[0007] The power transmission channel and the data transmission channel share a pair of coupling coils with taps and ferrite cores.

[0008] In some embodiments, the coupling coil includes a primary coil and a secondary coil, and the primary coil and the secondary coil are each divided into an inner winding and an outer winding, and the tap is arranged at the connection point of the inner winding and the outer winding.

[0009] In some embodiments, the power transmission channel comprises:

[0010] An H-bridge inverter is used to convert the DC power supply into an alternating current signal;

[0011] The coupling coil includes a primary coil and a secondary coil, and the primary coil is used to transmit the alternating current signal to the secondary coil, and the secondary coil is used to transmit the alternating current signal to a rectifier.

[0012] The rectifier is used to convert the AC signal into the DC voltage, and then output the DC voltage to the external load;

[0013] A primary-side compensation network is connected between the H-bridge inverter and the primary coil to filter out the high-order harmonics generated by the H-bridge inverter and suppress the common-mode current generated by the H-bridge inverter.

[0014] A secondary-side compensation network is connected between the secondary coil and the rectifier to filter out the high-order harmonics generated by the rectifier and suppress the common-mode current generated by the rectifier.

[0015] In some embodiments, the primary-side compensation network includes:

[0016] A primary-side compensation inductor, one end of which is connected to the H-bridge inverter, and the other end of which is connected to a primary-side parallel capacitor;

[0017] The primary-side parallel capacitor has one end connected between one end of the primary-side compensating inductor and one end of the primary-side series capacitor, and the other end connected between the other end of the primary-side compensating inductor and one end of the primary coil.

[0018] The primary-side series capacitor, the primary-side compensation inductor, and the primary-side parallel capacitor are all connected to one end of the primary-side series capacitor, and the other end of the primary-side series capacitor is connected to one end of the primary coil.

[0019] The compensation parameters of the primary-side compensation network satisfy the primary-side resonance condition, which is:

[0020] ω p L p -1 / (ω) p C p )=ω p L f1 =1 / (ω) p C f1 );

[0021] Where, ω p L represents the angular frequency of the power line carrier. p L represents the inductance value of the primary coil. f1 C represents the inductance value of the primary-side compensation inductor. p C represents the capacitance value of the primary-side series capacitor. f1 This indicates the capacitance value of the parallel capacitor on the primary side.

[0022] In some embodiments, the secondary side compensation network comprises:

[0023] a secondary side compensation inductor, one end of the secondary side compensation inductor being connected with the rectifier, the other end of the secondary side compensation inductor being connected with a secondary side parallel capacitor;

[0024] the secondary side parallel capacitor, one end of the secondary side parallel capacitor being connected between one end of the secondary side compensation inductor and one end of a secondary side series capacitor, the other end of the secondary side parallel capacitor being connected between the other end of the secondary side compensation inductor and one end of the secondary winding;

[0025] the secondary side series capacitor, one end of the secondary side compensation inductor and one end of the secondary side parallel capacitor both being connected with one end of the secondary side series capacitor, the other end of the secondary side series capacitor being connected with one end of the secondary winding;

[0026] a compensation parameter of the secondary side compensation network satisfying a secondary side resonance condition, the secondary side resonance condition being:

[0027] ω p L s -1 / (ω p C s )=ω p L f2 =1 / (ω p C f2 );

[0028] wherein ω p represents a power carrier angular frequency, L s represents an inductance value of the secondary winding, L f2 represents an inductance value of the secondary side compensation inductor, C s represents a capacitance value of the secondary side series capacitor, and C f2 represents a capacitance value of the secondary side parallel capacitor.

[0029] In some embodiments, the data transmission channel comprises a primary side data transmission channel and a secondary side data transmission channel, the primary side data transmission channel and the secondary side data transmission channel both comprising:

[0030] a power amplifier, configured to amplify the high frequency carrier signal;

[0031] a coupling capacitor, connected with the coupling winding, configured to isolate a low frequency component in the power transmission channel during forward transmission, or configured to filter a low frequency component in the coupling winding during reverse transmission;

[0032] The coupling coil includes the tap, and the tap is connected with the coupling capacitor, and is used for injecting or extracting the high-frequency carrier signal during forward transmission and reverse transmission;

[0033] Demodulation circuit, for recovering the received high-frequency carrier signal to the original baseband signal.

[0034] To achieve the above object, another aspect of the embodiment of the present application proposes a wireless power and data synchronous transmission method with high-speed half-duplex communication, which is realized by the wireless power and data synchronous transmission system with high-speed half-duplex communication as described above, and includes the following steps:

[0035] Through the power transmission channel, the input DC power is converted into a DC voltage, and then the DC voltage is output to an external load, and a double-sided LLCC compensation topology method is used to filter out high-order harmonics in the power transmission channel, suppress common-mode current in the power transmission channel, and realize zero-voltage switching at the same time;

[0036] Through the data transmission channel, an amplitude shift keying modulation and demodulation method is used to inject or extract a high-frequency carrier signal, and then the high-frequency carrier signal is recovered to the original baseband signal, realizing half-duplex communication;

[0037] The power transmission channel and the data transmission channel share a coupling coil with a tap and a ferrite core.

[0038] In some embodiments, the coupling coil includes a primary coil and a secondary coil, and the power transmission channel converts the input DC power into a DC voltage, and then outputs the DC voltage to an external load, and uses a double-sided LLCC compensation topology method to filter out high-order harmonics in the power transmission channel, suppress common-mode current in the power transmission channel, specifically including:

[0039] The DC power is converted into an alternating current signal through an H-bridge inverter;

[0040] The alternating current signal is transmitted to the secondary coil through the primary coil, and the alternating current signal is transmitted to a rectifier through the secondary coil;

[0041] The alternating current signal is converted into the DC voltage through the rectifier, and then the DC voltage is output to the external load;

[0042] The high-order harmonics generated by the H-bridge inverter are filtered out through a primary side compensation network, and the common-mode current generated by the H-bridge inverter is suppressed;

[0043] The high-order harmonics generated by the rectifier are filtered out through a secondary side compensation network, and the common-mode current generated by the rectifier is suppressed.

[0044] In some embodiments, the secondary side compensation network comprises a secondary side series capacitor, the zero voltage switching is achieved, and specifically comprises:

[0045] The capacitance value of the secondary side series capacitor is adjusted to a preset capacitance value, so that the off current of the switch tube in the H-bridge inverter is a preset current value, and the zero voltage switching is achieved.

[0046] In some embodiments, the high-frequency carrier signal is injected or extracted through the data transmission channel by using the amplitude shift keying modulation and demodulation method, and then the high-frequency carrier signal is restored to the original baseband signal, and half-duplex communication is achieved, and specifically comprises:

[0047] The high-frequency carrier signal is amplified by a power amplifier;

[0048] The low-frequency component in the power transmission channel is isolated by the coupling capacitor during forward transmission, or the low-frequency component in the coupling coil is filtered during reverse transmission;

[0049] The high-frequency carrier signal is injected or extracted by the tap during forward transmission and reverse transmission;

[0050] The received high-frequency carrier signal is restored to the original baseband signal by the demodulation circuit.

[0051] The beneficial effects of the present application are: the wireless power and data synchronous transmission system and method with high-speed half-duplex communication, on the one hand, the power transmission channel and the data transmission channel share a pair of coupling coils with taps and ferrite cores, without additional wave traps and coupling coils, reducing the system cost and size; on the other hand, the power transmission channel adopts double-sided LLCC compensation topology, which can filter most of the high-order harmonics generated in the power transmission channel, while suppressing common-mode current, and considering zero voltage switching in the compensation design to suppress electromagnetic interference, and using low-cost and easy-to-implement amplitude shift keying technology for modulation and demodulation in the data transmission channel, which can balance data rate and power transmission efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following introduces the drawings needed to be used in the embodiments of the present application. It should be understood that the drawings introduced below are only for the convenience of clearly describing some embodiments in the technical solutions of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the premise that there is no creative labor.

[0053] Figure 1A topological structure diagram of a wireless power and data synchronous transmission system with high-speed half-duplex communication according to an embodiment of the present application is provided;

[0054] Figure 2 A geometric structure diagram of a coupling coil according to an embodiment of the present application is provided;

[0055] Figure 3 An equivalent model diagram of a coupling coil according to an embodiment of the present application is provided;

[0056] Figure 4 A simplified equivalent model diagram of a power transmission channel according to an embodiment of the present application is provided;

[0057] Figure 5 A structure diagram of a demodulation circuit according to an embodiment of the present application is provided;

[0058] Figure 6 A simplified equivalent circuit diagram of a data transmission channel according to an embodiment of the present application is provided;

[0059] Figure 7 A high-frequency distributed parameter model diagram of a simplified data transmission channel according to an embodiment of the present application is provided;

[0060] Figure 8 A relationship curve diagram of a turn-off current I OFF and a secondary side series capacitor C s according to an embodiment of the present application is provided;

[0061] Figure 9 An input-output waveform diagram of power transmission according to an embodiment of the present application is provided;

[0062] Figure 10 A transmission and reception waveform diagram of an ASK modulation signal according to an embodiment of the present application is provided;

[0063] Figure 11 An experimental result diagram of power transmission efficiency according to an embodiment of the present application is provided;

[0064] Figure 12 A relationship curve diagram of power transmission efficiency and load under different coupling coefficients k according to an embodiment of the present application is provided;

[0065] Figure 13 A step diagram of a wireless power and data synchronous transmission method with high-speed half-duplex communication according to an embodiment of the present application is provided. DETAILED DESCRIPTION

[0066] In order to make the purposes, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not intended to limit the present application. When the following description refers to the accompanying drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with embodiments of the present application. They are only examples of devices and methods consistent with some aspects of the embodiments of the present application as detailed in the appended claims.

[0067] It can be understood that the terms "first", "second", and the like used in the present application can be used herein to describe various concepts, but unless specifically stated, these concepts are not limited by these terms. These terms are only used to distinguish one concept from another. For example, without departing from the scope of the embodiments of the present application, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information. Depending on the context, the word "if" as used herein can be interpreted as "when" or "when" or "in response to determining".

[0068] The terms "at least one", "multiple", "each", "any", and the like used in the present application include one, two or more than two, multiple includes two or more than two, each refers to each of the corresponding multiple, and any refers to any one of the multiple.

[0069] Wireless power and data synchronous transmission (SWPDT) systems have wide applications in the fields of robots, smart homes and electric vehicles. In related prior art, power and data transmission often use separate coils or additional traps, resulting in increased system cost, size, and susceptibility to interference, and it is difficult to balance data rate and power transmission efficiency (PTE).

[0070] The existing wireless power and data synchronous transmission (SWPDT) system has the following problems:

[0071] 1) The tap position selection affects the communication performance, and it is difficult to balance the power transmission and data transmission efficiency;

[0072] 2) High-order harmonic and common-mode current interference is serious, resulting in enhanced electromagnetic interference (EMI);

[0073] 3) Additional components (such as traps, communication coils) are required, increasing system complexity and cost;

[0074] 4) The data rate is relatively low, usually less than 1Mb / s, and the power transmission efficiency needs to be improved.

[0075] Therefore, the embodiment of the present application provides a wireless power and data synchronous transmission system with high-speed half-duplex communication.

[0076] With reference to Figure 1 , Figure 1 The embodiment of the present application provides a topological structure diagram of the wireless power and data synchronous transmission system with high-speed half-duplex communication, and the embodiment of the present application provides a wireless power and data synchronous transmission system with high-speed half-duplex communication, which comprises:

[0077] The power transmission channel is used for converting an input DC power into a DC voltage, and then outputting the DC voltage to an external load, and adopts a double-sided LLCC compensation topology method to filter high-order harmonics in the power transmission channel, suppress common-mode current in the power transmission channel, and realize zero-voltage switching.

[0078] The data transmission channel adopts an amplitude shift keying modulation and demodulation method, is used for injecting or extracting a high-frequency carrier signal, and then restores the high-frequency carrier signal to an original baseband signal to realize half-duplex communication.

[0079] The power transmission channel and the data transmission channel share a pair of coupling coils with taps and a ferrite core.

[0080] Specifically, the power transmission channel and the data transmission channel share a pair of coupling coils with taps and a ferrite core. The power transmission channel adopts a double-sided LLCC compensation topology, is used for filtering high-order harmonics generated in the power transmission channel, suppressing common-mode current, and realizing zero-voltage switching; the data transmission channel adopts an amplitude shift keying (ASK) modulation and demodulation technology, injects or extracts a high-frequency carrier signal through the taps of the coupling coil, and does not need an additional wave trap and a communication coil.

[0081] Further, as an optional implementation manner, the coupling coil comprises a primary coil and a secondary coil, the primary coil and the secondary coil are both divided into an inner winding and an outer winding, and the tap is arranged at a connection point of the inner winding and the outer winding.

[0082] Specifically, as shown in Figure 2 a geometric structure diagram of the coupling coil, and as shown in Figure 3 an equivalent model diagram of the coupling coil,Figure 2 The primary coil L p , the secondary coil L s , the primary coil outer winding N w1 and the inner winding N w2 , the secondary coil outer winding N w3 and the inner winding N w4 , the primary tap T p , the secondary tap T s , the primary coil inner diameter R p-in and the outer diameter R p-out , the secondary coil inner diameter R s-in and the outer diameter R s-out , the gap D ps , Figure 3 The winding self-inductance L w1 -L w4 and mutual inductance M pq are marked in the figure.

[0083] In some optional embodiments, the primary coil L p and the secondary coil L s with taps and a ferrite core are both divided into inner windings and outer windings, and the primary tap T p and the secondary tap T s are both used for data signal injection or extraction. The embodiments of the application design the outer winding turn number N p = 7 and the inner winding turn number N w1 = 23 of the primary coil L w2 ; the outer winding turn number N s = 7 and the inner winding turn number N w3 = 23 of the secondary coil L w4 , and the corresponding primary tap and secondary tap (N w1 = N w3 = 7) are arranged at the connection points of the inner windings and the outer windings, so as to realize signal injection or extraction through partial coil turns.

[0084] Referring to Figure 1 , further as an optional implementation, the power transmission channel comprises:

[0085] an H-bridge inverter, configured to convert a direct-current power into an alternating-current signal;

[0086] a coupling coil, comprising a primary coil and a secondary coil, the primary coil being configured to transmit the alternating-current signal to the secondary coil, and the secondary coil being configured to transmit the alternating-current signal to a rectifier;

[0087] the rectifier, configured to convert the alternating-current signal into a direct-current voltage, and then output the direct-current voltage to an external load;

[0088] The primary side compensation network is connected between the H-bridge inverter and the primary coil, and is used for filtering high-order harmonics generated by the H-bridge inverter and suppressing common-mode current generated by the H-bridge inverter.

[0089] The secondary side compensation network is connected between the secondary coil and the rectifier, and is used for filtering high-order harmonics generated by the rectifier and suppressing common-mode current generated by the rectifier.

[0090] Specifically, as shown in Figure 1 , the power transmission channel includes an H-bridge inverter, a coupling coil, a rectifier, a primary side compensation network, and a secondary side compensation network. The H-bridge inverter includes switching tubes Q1, Q2, Q3, and Q4, the coupling coil includes a primary coil L p and a secondary coil L s , the rectifier includes diodes D5, D6, D7, and D8, the primary side compensation network includes primary side compensation inductors L f11 and L f12 , a primary side parallel capacitor C f1 , and a primary side series capacitor C p , and the secondary side compensation network includes secondary side compensation inductors L f21 and L f22 , a secondary side parallel capacitor C f2 , and a secondary side series capacitor C s . Based on the H-bridge inverter, the coupling coil, the rectifier, the primary side compensation network, and the secondary side compensation network, the power carrier frequency is determined to be f p = 85 kHz, and the power transmission process of the system is as follows:

[0091] (1) Inverter and compensation: The DC power supply is converted into an alternating current signal of 85 kHz through the H-bridge inverter, the primary side compensation network resonates at the power carrier frequency (i.e., 85 kHz), filters high-order harmonics generated by the H-bridge inverter, prevents the high-order harmonics from being transmitted to the primary coil, and suppresses common-mode current generated by the H-bridge inverter.

[0092] (2) Coil coupling and secondary processing: Energy is transmitted to the secondary coil through inductive coupling, converted into a direct current voltage through the rectifier, and supplied to an external load. Similarly, the secondary side compensation network filters high-order harmonics generated by the rectifier and suppresses common-mode current generated by the rectifier.

[0093] (3) Zero voltage switching (ZVS) implementation: The value of the secondary side series capacitor C s is adjusted so that the turn-off current I OFF of the MOSFET satisfies the ZVS condition (I OFF = 1 A) to ensure that the junction capacitance is fully discharged within the dead time, reduce switching loss, and improve system efficiency.

[0094] ReferenceFigure 1 As a further optional implementation, the primary side compensation network comprises:

[0095] a primary side compensation inductor, one end of the primary side compensation inductor being connected to the H-bridge inverter, and the other end of the primary side compensation inductor being connected to the primary side parallel capacitor;

[0096] a primary side parallel capacitor, one end of the primary side parallel capacitor being connected between one end of the primary side compensation inductor and one end of the primary side series capacitor, and the other end of the primary side parallel capacitor being connected between the other end of the primary side compensation inductor and one end of the primary coil;

[0097] a primary side series capacitor, one end of the primary side compensation inductor and one end of the primary side parallel capacitor both being connected to one end of the primary side series capacitor, and the other end of the primary side series capacitor being connected to one end of the primary coil;

[0098] the compensation parameters of the primary side compensation network satisfy a primary side resonance condition, the primary side resonance condition being:

[0099] ω p L p -1 / (ω p C p )=ω p L f1 =1 / (ω p C f1 );

[0100] wherein ω p represents a power carrier angular frequency, L p represents an inductance value of the primary coil, L f1 represents an inductance value of the primary side compensation inductor, C p represents a capacitance value of the primary side series capacitor, and C f1 represents a capacitance value of the primary side parallel capacitor.

[0101] With reference to Figure 1 As a further optional implementation, the secondary side compensation network comprises:

[0102] a secondary side compensation inductor, one end of the secondary side compensation inductor being connected to the rectifier, and the other end of the secondary side compensation inductor being connected to the secondary side parallel capacitor;

[0103] a secondary side parallel capacitor, one end of the secondary side parallel capacitor being connected between one end of the secondary side compensation inductor and one end of the secondary side series capacitor, and the other end of the secondary side parallel capacitor being connected between the other end of the secondary side compensation inductor and one end of the secondary coil;

[0104] The secondary side series capacitor, the secondary side compensation inductor and the secondary side parallel capacitor are both connected to one end of the secondary side series capacitor, and the other end of the secondary side series capacitor is connected to one end of the secondary coil.

[0105] The compensation parameters of the secondary-side compensation network satisfy the secondary-side resonance condition, which is:

[0106] ω p L s -1 / (ω) p C s )=ω p L f2 =1 / (ω) p C f2 );

[0107] Where, ω p L represents the angular frequency of the power line carrier. s L represents the inductance value of the secondary coil. f2 C represents the inductance value of the secondary-side compensation inductor. s C represents the capacitance value of the series capacitor on the secondary side. f2 This indicates the capacitance value of the parallel capacitor on the secondary side.

[0108] Furthermore, such as Figure 4 The diagram shown is a simplified equivalent model of a power transmission channel, illustrating the primary coil L. p Secondary coil L s Compensation element (primary side compensation inductor L) f11 and L f12 Primary-side parallel capacitor C f1 Primary side series capacitor C p Secondary side compensation inductor L f21 and L f22 Secondary-side parallel capacitor C f2 Secondary side series capacitor C s The relationship between the mutual inductance M and the power transfer efficiency and filtering effect is used to analyze the power transfer efficiency and filtering effect.

[0109] Reference Figure 1 As an optional implementation, the data transmission channel includes a primary-side data transmission channel and a secondary-side data transmission channel, both of which include:

[0110] A power amplifier is used to amplify high-frequency carrier signals;

[0111] A coupling capacitor, connected to a coupling coil, is used to isolate low-frequency components in the power transmission path during forward transmission, or to filter low-frequency components in the coupling coil during reverse transmission.

[0112] A coupling coil, including a tap connected to a coupling capacitor, is used to inject or extract a high-frequency carrier signal during forward and reverse transmission.

[0113] The demodulation circuit is used to recover the received high-frequency carrier signal back to the original baseband signal.

[0114] Specifically, such as Figure 1 As shown, the data transmission channel includes a primary-side data transmission channel and a secondary-side data transmission channel. Both the primary-side and secondary-side data transmission channels include a power amplifier, coupling capacitors, coupling coils, and demodulation circuits. The coupling capacitors are divided into primary-side coupling capacitors C... dp and secondary-side coupling capacitor C ds Taps are divided into primary taps T. p and secondary tap T s ,like Figure 5 The diagram shows the structure of the demodulation circuit, which includes a voltage follower, an envelope extraction module, and a voltage comparator, used to recover the baseband signal from the received high-frequency carrier. Based on the power amplifier, coupling capacitor, coupling coil, and demodulation circuit, the high-frequency carrier frequency is determined to be f. d =27.7MHz, the system's data transmission process is as follows (taking forward transmission as an example):

[0115] (1) ASK modulation and injection: The baseband signal is loaded onto a 27.7MHz high-frequency carrier through ASK modulation. The modulated signal (i.e., the high-frequency carrier signal) is amplified by a power amplifier and then passed through the primary tap T. p Injected into primary coil L p Through the primary side coupling capacitor C dp The low-frequency component of the isolated H-bridge inverter output only allows a 27.7MHz high-frequency carrier to pass through the primary tap T. p Injected into primary coil L p .

[0116] (2) Signal reception and demodulation: secondary tap T s High-frequency carrier signals are received via electromagnetic coupling, and then coupled through the secondary-side coupling capacitor C. ds The signal is coupled to the demodulation circuit, while blocking the low-frequency components of the power transmission channel from entering the demodulation circuit. The demodulation circuit sequentially isolates the signal through a voltage follower (a voltage follower of model THS4001 is used in this embodiment), extracts the high-frequency carrier envelope through an envelope extraction module, and recovers the baseband signal through a voltage comparator (a voltage comparator of model TLV3501 is used in this embodiment) to complete data reception.

[0117] (3) Half-duplex communication: The reverse data transmission process is the same. Half-duplex communication is achieved by switching the sending and receiving directions. The data rate is stable at 1.25Mb / s, which meets the real-time requirements.

[0118] Further, as Figure 6 shown is a simplified equivalent circuit schematic diagram of the data transmission channel, which shows the high-frequency carrier transmission process. Among them, L p is the self-inductance of the primary coil, L s is the self-inductance of the secondary coil, C eq1 is the equivalent capacitance of the primary side parallel capacitor C f1 and the primary side series capacitor C p , C eq2 is the equivalent capacitance of the secondary side parallel capacitor C f2 and the secondary side series capacitor C s , C dp and C ds are the coupling capacitances of the data transmission channel, L dp and L ds are the equivalent inductances of the isolation transformer, U TXp is the data signal, R ds is the equivalent resistance of the data receiving end. As Figure 7 shown is a high-frequency distributed parameter model schematic diagram of the simplified data transmission channel, which considers the skin effect and proximity effect of the coil, including the self-inductance, mutual inductance, inter-turn parasitic capacitance of each turn of the coil, etc., which is used to analyze the high-frequency signal transmission characteristics. Among them, R Lpi and L pi are the equivalent series resistance and inductance of each turn of the primary coil, R Lsi and L si are the equivalent series resistance and inductance of each turn of the secondary coil, M pi,j is the mutual inductance between any two turns of the primary coil. M si,j is the mutual inductance between any two turns of the secondary coil, C pi,j and R pi,j are the inter-turn parasitic capacitance and its equivalent series resistance of the primary coil, C si,j and R si,j are the inter-turn parasitic capacitance and its equivalent series resistance of the secondary coil, U pi and U si represent the node voltages of each turn of the primary and secondary coils, while I pi and I si represent the current flowing through each turn of the primary and secondary coils, i=1,2,…,n; j=1,2,…,n, and i≠j, n is the number of turns, M pgsh (g=1,2,…,n; h=1,2,…,n) represents the mutual inductance between any primary coil and any secondary coil, I pinx and I sinx represent the currents flowing into the xth node on the primary side coupling capacitor C dp and the secondary side coupling capacitor C ds .

[0119] The structure of the wireless power and data synchronization transmission system with high-speed half-duplex communication in this application embodiment has been described above. Based on the above structure, the key parameters set in this application embodiment are shown in Table 1 below. All parameters have been experimentally verified to ensure optimal system performance.

[0120] Table 1

[0121] Symbol Parameter value Symbol Parameter value L p ,L s ]]> 286.8 μH, 286.5 μH [R p-in ,R s-in ]]> 0.02m [C p ,C s ]]> 17.78 nF, 20.1 nF [R p-out ,R s-out ]]> 0.14m [C f1 ,C f2 ]]> 40.08 nF, 40.1 nF N w1 ,N w3 ]]> 7 turns L f1 ,L f2 ]]> 87.82 μH, 87.93 μH N w2 , N w4 ]]> 23 turns [C fi ,C fo ]]> 1000 μF [CAT w1 , L w3 ]]> 41.58 μH, 39 μH [C dp ,C ds ]]> 560 pF L w2 ,L w4 ]]> 164 μH, 164.8 μH f p ]]> 85 kHz M w1w2 ,M w3w4 ]]> 40.86 μH, 41.4 μH f d ]]> 27.72 MHz M w1w3 ]]> 7.83 μH k 0.266 M w2w4 ]]> 40.98 μH [R L ]]> 60.5 Ω M w1w4 ,M w2w3 ]]> 18.71 μH, 16 μH D ps ]]> 10 cm [R dp ,R ds ]]> 50 Ω U in ]]> 181V L dp ,L ds ]]> 3.85 μH

[0122] The above description of the structure and parameter design of a wireless power and data synchronization transmission system with high-speed half-duplex communication according to an embodiment of this application demonstrates that, compared with existing wireless power and data synchronization transmission systems, this application has the following advantages:

[0123] I. The power transmission channel and data transmission channel share a pair of coupled coils with taps and ferrite cores, eliminating the need for additional notch filters and coupled coils, thus reducing system cost and size;

[0124] Second, the power transmission channel adopts a double-sided LLCC compensation topology, which can filter out most of the high-order harmonics generated by the H-bridge inverter and rectifier, while suppressing common-mode current. In addition, zero-voltage switching is considered in the compensation design to suppress electromagnetic interference, reduce switching losses, and improve power transmission efficiency.

[0125] Third, low-cost and easy-to-implement amplitude shift keying (APS) technology is used for modulation and demodulation in the data transmission channel, supporting 1.25Mb / s half-duplex communication, while being compatible with power line carrier co-channel transmission, which significantly reduces system complexity and power consumption and improves data transmission efficiency.

[0126] To further verify the effectiveness and stability of the wireless power and data synchronization transmission system with high-speed half-duplex communication proposed in the embodiments of this application, the effects of the embodiments of this application will be further explained below in conjunction with experiments.

[0127] Experiment 1: Feasibility Experiment of Zero-Voltage Switching. (e.g., ...) Figure 8 The figure shows the turn-off current I. OFF Series capacitor C on the secondary side s The relationship curve diagram is composed of... Figure 8 It can be seen that when ΔC s / C s When I = 0.138, the turn-off current I OFF The voltage is 1A, which satisfies the zero-voltage switching condition, verifying that the secondary-side series capacitor C in the embodiments of this application can be adjusted. s Feasibility of achieving zero-voltage switching.

[0128] Experiment 2: Power and Data Transmission Experiment. Figure 9The input and output waveform diagram of power transmission is shown, wherein U Figure 9 It can be seen that the inverter output voltage U AB The rectifier input voltage U ab are both 200V, the inverter output current I AB The rectifier input current I ab are both 10A, the input DC voltage U in The output DC voltage U out are both 200V, the input DC current I in The output DC current I out are both 5A, which verifies the stability and high efficiency of power transmission. Figure 10 The sending and receiving waveform diagram of the ASK modulated signal is shown, wherein U TXp represents the data signal emitted by the primary side, U RXs represents the data signal received by the secondary side, and U d2 represents the demodulated data, and by Figure 10 It can be seen that after signal demodulation, the signal-to-noise ratio SNR>20dB, the data rate is 1.25Mb / s, and the communication reliability requirement is met.

[0129] Experiment 3: Power transmission efficiency experiment. Figure 11 The experimental result of the power transmission efficiency experiment is shown, wherein U Figure 11 It can be seen that when the input DC voltage U dc1 =180.97V, the input DC current I dc1 =3.15A, R L =60.5Ω, the input power P1=570.4W, the system output DC voltage U dc2 =181.01V, the output DC current I dc2 =3.01A, and the output power P2=545W, the transmission efficiency reaches 95.55%, which verifies the high efficiency of power transmission.

[0130] Experiment 4: Robustness experiment under different loads or coupling conditions. Figure 12 The relationship curve between the power transmission efficiency and the load under different coupling coefficients k is shown, wherein U Figure 12 It can be seen that in the range of load 20Ω-60Ω and coupling coefficient k=0.187-0.266, the power transmission efficiency remains greater than 90%, which verifies the robustness of the system, and the data transmission is not disturbed, and the system has excellent stability.

[0131] In summary, the wireless power and data synchronous transmission system with high-speed half-duplex communication of the embodiments of the application can realize an output power of 545W, a maximum power transmission efficiency (PTE) of 95.55%, and a maximum data rate of 1.25Mb / s.

[0132] Reference Figure 13 , Figure 13 The steps of the wireless power and data synchronous transmission method with high-speed half-duplex communication provided by an embodiment of the present application are shown in the schematic diagram. The embodiment of the present application provides a wireless power and data synchronous transmission method with high-speed half-duplex communication, which is used to realize the wireless power and data synchronous transmission system with high-speed half-duplex communication, and includes the following steps S101 to S102:

[0133] In step S101, the input DC power is converted into a DC voltage through a power transmission channel, and the DC voltage is then output to an external load. A double-sided LLCC compensation topology method is used to filter out high-order harmonics in the power transmission channel and suppress common-mode current in the power transmission channel, while realizing zero-voltage switching.

[0134] In step S102, the amplitude shift keying modulation and demodulation method is used to inject or extract a high-frequency carrier signal through a data transmission channel, and then the high-frequency carrier signal is restored to the original baseband signal to realize half-duplex communication.

[0135] The power transmission channel and the data transmission channel share a pair of coupling coils with taps and a ferrite core.

[0136] As a further optional implementation, the coupling coil includes a primary coil and a secondary coil. The step of converting the input DC power into a DC voltage through a power transmission channel, and then outputting the DC voltage to an external load, and using a double-sided LLCC compensation topology method to filter out high-order harmonics in the power transmission channel and suppress common-mode current in the power transmission channel, can be specifically divided into the following steps S1011 to S1015:

[0137] In step S1011, the DC power is converted into an alternating current signal through an H-bridge inverter.

[0138] In step S1012, the alternating current signal is transmitted to the secondary coil through the primary coil, and the alternating current signal is transmitted to the rectifier through the secondary coil.

[0139] In step S1013, the alternating current signal is converted into a DC voltage through a rectifier, and the DC voltage is then output to an external load.

[0140] In step S1014, the primary side compensation network is used to filter out high-order harmonics generated by the H-bridge inverter and suppress common-mode current generated by the H-bridge inverter.

[0141] In step S1015, the secondary side compensation network is used to filter out high-order harmonics generated by the rectifier and suppress common-mode current generated by the rectifier.

[0142] Further as the optional implementation, the secondary side compensation network comprises a secondary side series capacitor, and the step of realizing zero voltage switching can be specifically the following step S1016.

[0143] In step S1016, the capacitance of the secondary side series capacitor is adjusted to a preset capacitance, so that the off current of the switch tube in the H-bridge inverter is a preset current value, and zero voltage switching is realized.

[0144] Further as the optional implementation, step S102 can be specifically divided into the following steps S1021 to S1024.

[0145] In step S1021, the high-frequency carrier signal is amplified by the power amplifier.

[0146] In step S1022, the low-frequency component in the power transmission channel is isolated in the forward transmission or the low-frequency component in the coupling coil is filtered in the reverse transmission by the coupling capacitor.

[0147] In step S1023, the high-frequency carrier signal is injected or extracted in the forward transmission and the reverse transmission by the tap.

[0148] In step S1024, the received high-frequency carrier signal is recovered to the original baseband signal by the demodulation circuit.

[0149] The contents in the above wireless power and data synchronous transmission system with high-speed half-duplex communication embodiment are applicable to the present wireless power and data synchronous transmission method with high-speed half-duplex communication embodiment, the present wireless power and data synchronous transmission method with high-speed half-duplex communication embodiment specifically realizes the same functions as the above wireless power and data synchronous transmission system with high-speed half-duplex communication embodiment, and achieves the same beneficial effects as the above wireless power and data synchronous transmission system with high-speed half-duplex communication embodiment.

[0150] In the above description of the present specification, the description of the terms "one embodiment", "another embodiment", or "some embodiments" or the like means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0151] While the embodiments of the application have been shown and described, it is to be understood that the embodiments can be varied, modified, substituted and changed by those skilled in the art without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.

[0152] The above is a specific description of the preferred embodiments of the application, but the application is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the application, and these equivalent modifications or substitutions are all included in the scope defined by the claims of the application.

Claims

1. A wireless power and data synchronization transmission system with high-speed half-duplex communication, characterized in that, include: The power transmission channel is used to convert the input DC power supply into DC voltage, and then output the DC voltage to the external load. It adopts a bilateral LLCC compensation topology method to filter out high-order harmonics in the power transmission channel, suppress common-mode current in the power transmission channel, and realize zero-voltage switching. The data transmission channel employs amplitude shift keying modulation and demodulation to inject or extract high-frequency carrier signals, thereby restoring the high-frequency carrier signals to the original baseband signals and realizing half-duplex communication. The power transmission channel and the data transmission channel share a pair of coupled coils with taps and ferrite cores.

2. The system according to claim 1, characterized in that, The coupling coil includes a primary coil and a secondary coil, both of which are divided into an inner winding and an outer winding. The tap is located at the connection point between the inner winding and the outer winding.

3. The system according to claim 1, characterized in that, The power transmission channel includes: H-bridge inverter, used to convert the DC power supply into an AC signal; The coupling coil includes a primary coil and a secondary coil. The primary coil is used to transmit the AC signal to the secondary coil, and the secondary coil is used to transmit the AC signal to the rectifier. The rectifier is used to convert the AC signal into the DC voltage, and then output the DC voltage to the external load; A primary-side compensation network is connected between the H-bridge inverter and the primary coil to filter out the high-order harmonics generated by the H-bridge inverter and suppress the common-mode current generated by the H-bridge inverter. A secondary-side compensation network is connected between the secondary coil and the rectifier to filter out the high-order harmonics generated by the rectifier and suppress the common-mode current generated by the rectifier.

4. The system according to claim 3, characterized in that, The primary-side compensation network includes: A primary-side compensation inductor, one end of which is connected to the H-bridge inverter, and the other end of which is connected to a primary-side parallel capacitor; The primary-side parallel capacitor has one end connected between one end of the primary-side compensating inductor and one end of the primary-side series capacitor, and the other end connected between the other end of the primary-side compensating inductor and one end of the primary coil. The primary-side series capacitor, the primary-side compensation inductor, and the primary-side parallel capacitor are all connected to one end of the primary-side series capacitor, and the other end of the primary-side series capacitor is connected to one end of the primary coil. The compensation parameters of the primary-side compensation network satisfy the primary-side resonance condition, which is: oh p L p -1 / (ω p C p )=ω p L f1 =1 / (ω p C f1 ); Where, ω p L represents the angular frequency of the power line carrier. p L represents the inductance value of the primary coil. f1 C represents the inductance value of the primary-side compensation inductor. p C represents the capacitance value of the primary-side series capacitor. f1 This indicates the capacitance value of the parallel capacitor on the primary side.

5. The system according to claim 3, characterized in that, The secondary-side compensation network includes: Secondary-side compensation inductor, one end of which is connected to the rectifier, and the other end of which is connected to a secondary-side parallel capacitor; The secondary-side parallel capacitor has one end connected between one end of the secondary-side compensating inductor and one end of the secondary-side series capacitor, and the other end connected between the other end of the secondary-side compensating inductor and one end of the secondary coil. The secondary-side series capacitor, the secondary-side compensation inductor, and the secondary-side parallel capacitor are all connected at one end to one end of the secondary-side series capacitor, and the other end of the secondary-side series capacitor is connected to one end of the secondary coil. The compensation parameters of the secondary-side compensation network satisfy the secondary-side resonance condition, which is: oh p L s -1 / (ω p C s )=ω p L f2 =1 / (ω p C f2 ); Where, ω p L represents the angular frequency of the power line carrier. s L represents the inductance value of the secondary coil. f2 C represents the inductance value of the secondary-side compensation inductor. s C represents the capacitance value of the secondary-side series capacitor. f2 This indicates the capacitance value of the parallel capacitor on the secondary side.

6. The system according to claim 1, characterized in that, The data transmission channel includes a primary-side data transmission channel and a secondary-side data transmission channel, both of which include: A power amplifier is used to amplify the high-frequency carrier signal; A coupling capacitor, connected to the coupling coil, is used to isolate low-frequency components in the power transmission channel during forward transmission, or to filter low-frequency components in the coupling coil during reverse transmission. The coupling coil includes the tap, which is connected to the coupling capacitor and is used to inject or extract the high-frequency carrier signal during forward and reverse transmission. A demodulation circuit is used to recover the received high-frequency carrier signal into the original baseband signal.

7. A method for wireless power and data synchronization transmission with high-speed half-duplex communication, implemented by a wireless power and data synchronization transmission system with high-speed half-duplex communication as described in any one of claims 1 to 6, characterized in that, Includes the following steps: The input DC power supply is converted into DC voltage through the power transmission channel, and then the DC voltage is output to the external load. The double-sided LLCC compensation topology method is used to filter out high-order harmonics in the power transmission channel, suppress common-mode current in the power transmission channel, and realize zero-voltage switching. Through the data transmission channel, amplitude shift keying modulation and demodulation methods are used to inject or extract high-frequency carrier signals, and then the high-frequency carrier signals are restored to the original baseband signals to achieve half-duplex communication. The power transmission channel and the data transmission channel share a pair of coupled coils with taps and ferrite cores.

8. The method according to claim 7, characterized in that, The coupling coil includes a primary coil and a secondary coil. The input DC power supply is converted into DC voltage through the power transmission channel, and then the DC voltage is output to an external load. A bilateral LLCC compensation topology method is used to filter out high-order harmonics and suppress common-mode current in the power transmission channel. Specifically, this includes: The DC power supply is converted into an AC signal using an H-bridge inverter; The AC signal is transmitted to the secondary coil through the primary coil, and then to the rectifier through the secondary coil. The rectifier converts the AC signal into the DC voltage, and then outputs the DC voltage to the external load. The high-order harmonics generated by the H-bridge inverter are filtered out and the common-mode current generated by the H-bridge inverter is suppressed through the primary-side compensation network. The secondary-side compensation network filters out the high-order harmonics generated by the rectifier and suppresses the common-mode current generated by the rectifier.

9. The method according to claim 8, characterized in that, The secondary-side compensation network includes a secondary-side series capacitor, and the zero-voltage switching is specifically achieved by: The capacitance value of the secondary-side series capacitor is adjusted to a preset capacitance value so that the turn-off current of the switching transistor in the H-bridge inverter is a preset current value, thereby achieving zero-voltage switching.

10. The method according to claim 7, characterized in that, The process involves injecting or extracting a high-frequency carrier signal through a data transmission channel using amplitude shift keying modulation and demodulation, and then restoring the high-frequency carrier signal to the original baseband signal to achieve half-duplex communication. Specifically, this includes: The high-frequency carrier signal to be transmitted is amplified by a power amplifier; Low-frequency components in the power transmission channel are isolated during forward transmission using a coupling capacitor, or low-frequency components in the coupling coil are filtered during reverse transmission. The high-frequency carrier signal is injected or extracted during forward and reverse transmission via the tap; The received high-frequency carrier signal is restored to the original baseband signal by the demodulation circuit.

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