Joint design method and device for separated wireless energy information synchronous transmission system

Abstract

The invention provides a joint design method and device for a separated wireless energy information synchronous transmission system, and the method comprises the steps: carrying out the equivalence of an energy transmission system and an information transmission system, and obtaining an energy mutual inductance equivalent model and an information mutual inductance equivalent model; determining a first coil parameter and a first circuit parameter of the energy mutual inductance equivalent model, determining a circuit parameter constraint condition based on an index requirement, a gain characteristic, a stress condition and a soft switching range of the energy transmission system, and determining a target first coil parameter and a target first circuit parameter based on the circuit parameter constraint condition; determining a second coil parameter of the information mutual inductance equivalent model based on the target first coil parameter, and determining a second circuit parameter based on constraint conditions of the output voltage and the conversion time; and designing an energy information synchronous transmission magnetic coupling mechanism based on the target first coil parameter, the second coil parameter and an information transmission coil zero coupling constraint condition. According to the invention, the performance of the wireless energy information synchronous transmission system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless transmission, and particularly relates to a joint design method and device for a separated wireless energy and information synchronous transmission system. Background Art

[0002] With the rapid development of fields such as deep-sea mining and ocean surveying, future unmanned equipment and its clusters, such as underwater robots and unmanned vehicles, undertake diversified tasks such as underwater operations and ocean surveying. Most tasks require continuous long-term work in the deep and far seas. Endurance has become a shortcoming in their task execution, and there is a large amount of data interaction such as video and sound with underwater energy base stations. The wireless energy and information synchronous transmission technology uses a non-contact method to convert energy or information into relay media such as electromagnetic waves and transmit them through the spatial seawater medium, achieving electrical isolation, and can fundamentally solve the problems of safe, reliable, flexible, convenient, and concealed power transmission and information interaction in the special harsh marine environment, and improve the endurance and information transmission rate of marine unmanned equipment and its clusters.

[0003] The parameter design of the existing wireless energy and information synchronous transmission system generally only considers conventional indicators such as the system output power, input and output voltages, and efficiency, and less consideration is given to the soft-switching characteristics of devices, the interference of the energy and information dual-channel transmission, and the stability of the control system, resulting in a lower efficiency, poor stability, and high error rate of the designed wireless energy and information synchronous transmission system.

[0004] Therefore, there is an urgent need to provide a joint design method and device for a separated wireless energy and information synchronous transmission system to improve the performance of the designed wireless energy and information synchronous transmission system. Summary of the Invention

[0005] In view of this, it is necessary to provide a joint design method and device for a separated wireless energy and information synchronous transmission system to solve the technical problems in the prior art that less consideration is given to the soft-switching range and dual-channel transmission interference, resulting in poor performance and insufficient practicability of the designed wireless energy and information synchronous transmission system.

[0006] On the one hand, to solve the above technical problems, the present invention provides a joint design method for a separated wireless energy and information synchronous transmission system. The separated wireless energy and information synchronous transmission system includes an energy transmission system using an LCC-LCC resonant compensation network, an information transmission system using an S-S resonant compensation network, and an energy and information synchronous transmission magnetic coupling mechanism. The method includes: Equivalent the energy transmission system and the information transmission system to obtain an energy mutual inductance equivalent model and an information mutual inductance equivalent model; Determine the first coil parameters and the first circuit parameters of the energy mutual inductance equivalent model, determine the circuit parameter constraint conditions based on the index requirements, gain characteristics, stress conditions and soft switching range of the energy transmission system, and determine the target first coil parameters and target first circuit parameters of the energy transmission system based on the first circuit parameters and the circuit parameter constraint conditions; Determine the second coil parameters of the information mutual inductance equivalent model based on the target first coil parameters, and determine the second circuit parameters based on the second coil parameters and the constraint conditions of the output voltage and conversion time; Design the magnetic coupling mechanism for synchronous energy and information transmission based on the target first coil parameters, the second coil parameters and the zero coupling constraint condition of the information transmission coil.

[0007] In a possible implementation manner, the determining the first coil parameters and the first circuit parameters of the energy mutual inductance equivalent model includes: Determine the first coil parameters of the energy mutual inductance equivalent model and the value range of the first coil parameters; Simulate the first coil parameters based on the value range to obtain the Pareto curve of the coupling coefficient and the coil volume; Determine the first coil parameters based on the Pareto curve; Obtain the initial number of turns of the first coil in the energy transmission system, and determine the self-inductance value of the first coil based on the initial number of turns and the first coil parameters; Determine the first circuit parameters based on the gain of the energy transmission system and the self-inductance value of the coil.

[0008] In a possible implementation manner, the determining the target first coil parameters and the target first circuit parameters of the energy transmission system based on the first circuit parameters and the circuit parameter constraint conditions includes: Judge whether the first circuit parameters meet the circuit parameter constraint conditions; If it is satisfied, the first coil parameters are the target first coil parameters, and the first circuit parameters are the target first circuit parameters; If it is not satisfied, add one to the initial number of turns to obtain an updated number of turns, determine the updated coil self-inductance based on the updated number of turns and the first coil parameters, and determine the updated circuit parameters based on the updated coil self-inductance and the gain until the updated circuit parameters meet the circuit parameter constraint conditions.

[0009] In a possible implementation manner, the determining the circuit parameter constraint conditions based on the index requirements, gain characteristics, stress and soft switching range of the energy transmission system includes: Determine the gain curve and coil size constraints based on the index requirements of the energy transmission system; Determine the constraint relationship between the self-inductance value of the coil and the resonant inductance value of the LCC-LCC resonant compensation network based on the gain curve; Determine the maximum effective value of the resonant current and the maximum effective value of the resonant voltage based on the stress condition; Determine the lower limit value and the upper limit value of the resonant inductance value based on the soft-switching range.

[0010] In a possible implementation, the first coil of the energy transmission system has the same structure as the second coil of the information transmission system, but different polarities.

[0011] In a possible implementation, the second circuit parameters include the capacitance value and the resistance value in the S-S resonant compensation network; then determine the second circuit parameters based on the second coil parameters and the constraint conditions of the output voltage and the conversion time, including: Determine the coil inductance value of the information transmission system based on the second coil parameters; Determine the capacitance value based on the coil inductance value and the information carrier frequency; Obtain the correspondence between the conversion time and the resistance value, determine the initial resistance value based on the conversion time and the correspondence, and optimize the initial resistance value based on the output voltage to obtain the resistance value.

[0012] In a possible implementation, both the first coil and the second coil are DD-type coils, and the first coil parameters and the second coil parameters both include the coil width, pole pitch, inner side length, inner side width, and number of turns; the first circuit parameters include the compensation inductance value, the second compensation capacitance value, and the first compensation capacitance value in the LCC-LCC resonant compensation network.

[0013] In a possible implementation, the energy mutual inductance equivalent model includes a DC voltage source circuit Uf, a primary full-bridge inverter circuit for providing alternating current to the energy transmission system, a transmitter compensation network, a receiver compensation network, and an output rectifier circuit. The full-bridge inverter circuit includes a first switching tube Q 1 、a second switching tube Q 2 、a third switching tube Q 3 and a fourth switching tube Q 4 . One end of the DC voltage source circuit U f is respectively connected to the first switching tube Q 1 and the third switching tube Q 3 . The other end of the DC voltage source circuit U f is respectively connected to the second switching tube Q 2 and the fourth switching tube Q 4 . The first switching tube Q 1Connected to the second switching transistor Q 2 ; the third switching transistor Q 3 is connected to the fourth switching transistor Q 4 ; the transmitter compensation network includes a first compensation inductor L f1 , a first compensation capacitor C 1 and a second compensation capacitor C f1 , one end of the first compensation inductor L f1 is connected to the output terminal of the DC voltage source circuit U f , the other end of the first compensation inductor L f1 is respectively connected to the first compensation capacitor C 1 and the second compensation capacitor C f1 , the transmission coil circuit includes a primary coil L p and a secondary coil L s , one end of the primary coil L p is connected to the first compensation capacitor C 1 , the other end of the primary coil L p is connected to the second compensation capacitor C f1 and then commonly connected to the other output terminal of the DC voltage source circuit U f , the receiver compensation network includes a second compensation inductor L f2 , a third compensation capacitor C 2 and a fourth compensation capacitor C f2 , one end of the second compensation inductor L f2 is connected to the output rectifier circuit, the other end of the second compensation inductor L f2 is respectively connected to the third compensation capacitor C 2 and the fourth compensation capacitor C f2 , one end of the third compensation capacitor C 2 is connected to one end of the secondary coil L s is connected to one end of the third compensation capacitor C 2 , the other end of the secondary coil L s is connected to the fourth compensation capacitor C f2 and then commonly connected to the output rectifier circuit; the output rectifier circuit includes a fifth switching transistor Q 5 , a sixth switching transistor Q 6 , a seventh switching transistor Q 7 , an eighth switching transistor Q 8 and a load resistor R L , one end of the load resistor R L is respectively connected to the fifth switching transistor Q 5 and the seventh switching transistor Q 7 , the other end of the load resistor R L is respectively connected to the sixth switching transistor Q 6 and the eighth switching transistor Q 8 , the fifth switching transistor Q 5 is connected to the sixth switching transistor Q6 is connected to the seventh switching transistor Q 7 and the eighth switching transistor Q 8 is connected.

[0014] In a possible implementation, the information mutual inductance equivalent model includes a primary side envelope detection circuit, a primary side precision rectification circuit, a primary side band-pass filter circuit, and a primary side high-pass filter circuit connected in series, a primary side information transmission network connected to two output terminals of the primary side high-pass filter circuit, a secondary side information reception network, a secondary side high-pass filter circuit connected to both ends of the secondary side information reception network, a secondary side band-pass filter circuit, a secondary side precision rectification circuit, and a secondary side envelope detection circuit connected in series in sequence with the secondary side high-pass filter circuit; the primary side information transmission network includes a primary side first resistor R d1 , and a primary side second resistor R d1 connected in parallel with the primary side first resistor R dp , a primary side first capacitor C dp connected in series with the primary side second resistor R d1 , an information primary side coil, an information secondary side coil, a secondary side first resistor R d2 , a secondary side second resistor R ds connected in series, and a secondary side first capacitor C d2 .

[0015] On the other hand, the present invention also provides a combined design device for a separated wireless energy information synchronous transmission system. The separated wireless energy information synchronous transmission system includes an energy transmission system adopting an LCC-LCC resonant compensation network, an information transmission system adopting an S-S resonant compensation network, and an energy information synchronous transmission magnetic coupling mechanism. The device includes: An equivalent model determination unit, configured to equivalent the energy transmission system and the information transmission system to obtain an energy mutual inductance equivalent model and an information mutual inductance equivalent model; An energy transmission system design unit, configured to determine the first coil parameters and the first circuit parameters of the energy mutual inductance equivalent model, determine the circuit parameter constraint conditions based on the index requirements, gain characteristics, stress conditions, and soft switching range of the energy transmission system, and determine the target first coil parameters and the target first circuit parameters of the energy transmission system based on the first circuit parameters and the circuit parameter constraint conditions; An information transmission system design unit, configured to determine the second coil parameters of the information mutual inductance equivalent model based on the target first coil parameters, and determine the second circuit parameters based on the second coil parameters and the constraint conditions of the output voltage and the conversion time; A synchronous transmission magnetic coupling mechanism design unit, configured to design the energy information synchronous transmission magnetic coupling mechanism based on the target first coil parameters, the second coil parameters, and the zero coupling constraint condition of the information transmission coil.

[0016] The beneficial effects of the present invention are as follows: For the joint design method of the separated wireless energy and information synchronous transmission system provided by the present invention, when determining the coil parameters and circuit parameters of the energy transmission system, while considering the index requirements of the energy transmission system, the gain characteristics, stress conditions, and soft-switching range are also taken into account, so that the determined target first coil parameters and target first circuit parameters meet the gain characteristics, stress conditions, and soft-switching range, improving the performance of the designed separated wireless energy and information synchronous transmission system. Moreover, when determining the second circuit parameters of the information transmission system, the constraint conditions of the output voltage and conversion time are considered, further improving the performance of the designed separated wireless energy and information synchronous transmission system.

[0017] Furthermore, when designing the information transmission system and the energy transmission system, the present invention both adopts a two-stage design, that is: first determine the primary parameters, and then determine the secondary parameters according to the constraint conditions and the primary parameters, ensuring the rationality and design efficiency of the parameter design process.

[0018] Even further, the present invention sets the wireless energy and information synchronous system as a separated type, avoiding the transmission interference between the energy transmission system and the information transmission system, further improving the system performance of the separated wireless energy and information synchronous transmission system, and enabling the energy transmission system and the information transmission system to be independently designed without considering mutual interference or coupling, further improving the design efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can be obtained according to these drawings.

[0020] Figure 1 It is a schematic structural diagram of an embodiment of the separated wireless energy and information synchronous transmission system provided by the present invention; Figure 2 It is a schematic flowchart of an embodiment of the joint design method of the separated wireless energy and information synchronous transmission system provided by the present invention; Figure 3 It is a schematic structural diagram of an embodiment of the energy mutual inductance equivalent model provided by the present invention; Figure 4 It is the corresponding relationship between the gain and the coupling coefficient, operating frequency, primary coil inductance, and first compensation inductance provided by the present invention; Figure 5 It is a schematic structural diagram of an embodiment of the information mutual inductance equivalent model provided by the present invention; Figure 6For the present invention Figure 2 Schematic diagram of an embodiment process for determining the first coil parameters and the first circuit parameters of the energy mutual inductance equivalent model in S202 of the present invention; Figure 7 Schematic diagram of an embodiment structure of the first coil provided by the present invention; Figure 8 Schematic diagram of a Pareto curve of the coupling coefficient and the coil volume provided by the present invention; Figure 9 Corresponding relationship diagram of the Z value of ZVS and the resonant inductance value provided by the present invention; Figure 10 Corresponding relationship diagram of self - inductance, coupling coefficient and number of turns provided by the present invention; Figure 11 Corresponding relationship diagram of circuit parameters and number of turns provided by the present invention; Figure 12 Schematic diagram of the structure of the second coil provided by the present invention; Figure 13 For the present invention Figure 2 Schematic diagram of an embodiment process for determining the second circuit parameters based on the second coil parameters and the constraint conditions of the output voltage and the conversion time in S203 of the present invention; Figure 14 Input - output voltage simulation diagram provided by the present invention; Figure 15 ZVS simulation diagram provided by the present invention; Figure 16 Primary - secondary coil voltage stress simulation diagram provided by the present invention; Figure 17 Received resistance voltage waveform diagram provided by the present invention; Figure 18 Schematic diagram of an embodiment structure of the joint design device of the separated wireless energy and information synchronous transmission system provided by the present invention. Detailed implementation manners

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] It should be understood that the schematic drawings are not drawn to scale. The flowcharts used in the present invention illustrate operations implemented according to some embodiments of the present invention. It should be understood that the operations of the flowchart may not be implemented in sequence, and steps without logical context may be reversed or implemented simultaneously. In addition, those skilled in the art can add one or more other operations to the flowchart or remove one or more operations from the flowchart under the guidance of the content of the present invention. Some of the block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software form, or implemented in one or more hardware modules or integrated circuits, or implemented in different networks and / or processor systems and / or microcontroller systems.

[0023] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in connection with the embodiments can be included in at least one embodiment of the present invention. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0024] The present invention provides a joint design method and device for a separated wireless energy and information synchronous transmission system, which will be described separately below.

[0025] Figure 1 is a schematic structural diagram of an embodiment of the separated wireless energy and information synchronous transmission system provided by the present invention. As Figure 1 shown, the separated wireless energy and information synchronous transmission system 10 includes an energy transmission system 11 adopting an LCC-LCC resonance compensation network, an information transmission system 12 adopting an S-S resonance compensation network, and an energy and information synchronous transmission magnetic coupling mechanism 13. Based on the above separated wireless energy and information synchronous transmission system, as Figure 2 shown, the joint design method of the separated wireless energy and information synchronous transmission system includes: S201. Equivalent the energy transmission system and the information transmission system to obtain an energy mutual inductance equivalent model and an information mutual inductance equivalent model; S202. Determine the first coil parameters and the first circuit parameters of the energy mutual inductance equivalent model, determine the circuit parameter constraint conditions based on the index requirements, gain characteristics, stress conditions, and soft-switching range of the energy transmission system, and determine the target first coil parameters and the target first circuit parameters of the energy transmission system based on the first circuit parameters and the circuit parameter constraint conditions; S203. Determine the second coil parameters of the information mutual inductance equivalent model based on the target first coil parameters, and determine the second circuit parameters based on the second coil parameters and the constraint conditions of the output voltage and the conversion time; S204. Design an energy information synchronous transmission magnetic coupling mechanism based on the target first coil parameters, the second coil parameters, and the zero coupling constraint condition of the information transmission coil.

[0026] In a specific embodiment of the present invention, the energy mutual inductance equivalent model in step S201 is as Figure 3 shown. The energy mutual inductance equivalent model includes a DC voltage source circuit Uf, a primary full-bridge inverter circuit for providing alternating current to the energy transmission system, a transmitter compensation network, a receiver compensation network, and an output rectifier circuit. The full-bridge inverter circuit includes a first switching tube Q 1 , a second switching tube Q 2 , a third switching tube Q 3 , and a fourth switching tube Q 4 . One end of the DC voltage source circuit U f is respectively connected to the first switching tube Q 1 and the third switching tube Q 3 . The other end of the DC voltage source circuit U f is respectively connected to the second switching tube Q 2 and the fourth switching tube Q 4 . The first switching tube Q 1 is connected to the second switching tube Q 2 . The third switching tube Q 3 is connected to the fourth switching tube Q 4 . The transmitter compensation network includes a first compensation inductor L f1 , a first compensation capacitor C 1 , and a second compensation capacitor C f1 . One end of the first compensation inductor L f1 is connected to the output end of the DC voltage source circuit U f . The other end of the first compensation inductor L f1 is respectively connected to the first compensation capacitor C 1 and the second compensation capacitor C f1 . The transmission coil circuit includes a primary coil L p and a secondary coil L s . One end of the primary coil L p is connected to the first compensation capacitor C 1 . The other end of the primary coil L p is connected to the second compensation capacitor C f1 and then jointly connected to the other output end of the DC voltage source circuit U f . The receiver compensation network includes a second compensation inductor L f2 , a third compensation capacitor C 2and the fourth compensation capacitor C f2 , the second compensation inductor L f2 One end of which is connected to the output rectifier circuit, and the other end of the second compensation inductor L f2 is respectively connected to the third compensation capacitor C 2 and the fourth compensation capacitor C f2 , one end of the third compensation capacitor C 2 is connected to one end of the secondary coil L s , one end of the secondary coil L 2 is connected to the third compensation capacitor C s , and the other end of the secondary coil L f2 is connected to the fourth compensation capacitor C and then jointly connected to the output rectifier circuit; the output rectifier circuit includes the fifth switching tube Q 5 , the sixth switching tube Q 6 , the seventh switching tube Q 7 , the eighth switching tube Q 8 and the load resistor R L , one end of the load resistor R L is respectively connected to the fifth switching tube Q 5 and the seventh switching tube Q 7 , the other end of the load resistor R L is respectively connected to the sixth switching tube Q 6 and the eighth switching tube Q 8 , the fifth switching tube Q 5 is connected to the sixth switching tube Q 6 , the seventh switching tube Q 7 is connected to the eighth switching tube Q 8 .

[0027] Among them, the LCC-LCC resonant compensation network designs parameters according to the system operating frequency. In order to make the input voltage and current of the resonant cavity in the same phase to compensate for the system's reactive power and reduce the flow of reactive current. At the same time, the LCC-LCC resonant compensation network improves the anti-offset characteristic of the wireless power transmission system, increases the working range of the energy transmission system, and the parameters of the energy transmission system are designed as follows:

[0028] In the formula, is the working angular frequency of the energy transmission system.

[0029] The LCC-LCC resonant compensation network can achieve a constant current source output, and the working voltage and current relationship of the circuit is as follows:

[0030] In the formula, U AB is the voltage at the transmitting end; U ab is the voltage at the output end; I f1 is the current entering the primary coil; Iab is the output terminal current; k p is the coupling coefficient; R E is the equivalent resistance of the transmitter compensation network; G power is the transmission power.

[0031] Among them, the index requirements of the energy transmission system in step S202 include but are not limited to the input voltage, output voltage, and output voltage. The gain characteristic is the relationship between the gain and the coupling coefficient, operating frequency, primary coil inductance, first compensation inductance, and the specific gain value.

[0032] In a specific embodiment of the present invention, as Figure 4 shown, it can be known from the left figure that the gain is directly proportional to the coupling coefficient and inversely proportional to the operating frequency. The two abscissas of the left figure are the coupling coefficient and the operating frequency respectively. It can be known from the right figure that the gain is directly proportional to the primary coil inductance and inversely proportional to the resonant inductance. The two abscissas of the right figure are the coil inductance and the resonant inductance respectively.

[0033] Among them, the specific gain value is 1.

[0034] In a specific embodiment of the present invention, as Figure 5 shown, the information mutual inductance equivalent model includes a primary envelope detection circuit, a primary precision rectification circuit, a primary band-pass filter circuit, and a primary high-pass filter circuit connected in series, a primary information transmission network connected to the two output terminals of the primary high-pass filter circuit, a secondary information reception network, a secondary high-pass filter circuit connected to both ends of the secondary information reception network, a secondary band-pass filter circuit, a secondary precision rectification circuit, and a secondary envelope detection circuit connected in series in sequence with the secondary high-pass filter circuit; the primary information transmission network includes a primary first resistor R d1 , a primary second resistor R d1 connected in parallel with the primary first resistor R dp , a primary first capacitor C dp connected in series with the primary second resistor R d1 , an information primary coil, an information secondary coil, a secondary first resistor R d2 , a secondary second resistor R ds , and a secondary first capacitor C d2 .

[0035] Among them, Figure 5 the leftmost and rightmost are comparison circuits.

[0036] Compared with the prior art, in the joint design method of the separated wireless energy and information synchronous transmission system provided by the embodiment of the present invention, when determining the coil parameters and circuit parameters of the energy transmission system, while considering the index requirements of the energy transmission system, the gain characteristics, stress conditions, and soft-switching range are also considered, so that the determined target first coil parameters and target first circuit parameters meet the gain characteristics, stress conditions, and soft-switching range, improving the performance of the designed separated wireless energy and information synchronous transmission system. Moreover, when determining the second circuit parameters of the information transmission system, the constraint conditions of the output voltage and conversion time are considered, further improving the performance of the designed separated wireless energy and information synchronous transmission system.

[0037] Further, when designing the information transmission system and the energy transmission system in the embodiment of the present invention, a two-stage design is adopted, that is: first, the primary parameters are determined, and then the secondary parameters are determined according to the constraint conditions and the primary parameters, ensuring the rationality and design efficiency of the parameter design process.

[0038] Furthermore, the wireless energy and information synchronous system is set as a separated type in the embodiment of the present invention, avoiding the transmission interference between the energy transmission system and the information transmission system, further improving the system performance of the separated wireless energy and information synchronous transmission system, and enabling the energy transmission system and the information transmission system to be independently designed without considering mutual interference or coupling, further improving the design efficiency.

[0039] In some embodiments of the present invention, as Figure 6 shown, determining the first coil parameters and the first circuit parameters of the energy mutual inductance equivalent model in step S202 includes: S601. Determine the first coil parameters of the energy mutual inductance equivalent model and the value range of the first coil parameters; S602. Simulate the first coil parameters based on the value range to obtain the Pareto curve of the coupling coefficient and the coil volume; S603. Determine the first coil parameters based on the Pareto curve; S604. Obtain the initial number of turns of the first coil in the energy transmission system, and determine the self-inductance value of the first coil based on the initial number of turns and the first coil parameters; S605. Determine the first circuit parameters based on the gain of the energy transmission system and the self-inductance value of the coil.

[0040] In a specific embodiment of the present invention, the primary coil and the secondary coil in the energy mutual inductance equivalent model are DD coils, and the structure of the DD coil is as Figure 7 shown, then the first coil parameters include the coil width W c , the pole pitch d p , the inner side length L i , and the inner side width W i, the parameter ranges of the first coil parameters are specifically as follows: the inner side length L i , the inner side width W i , the coil width W c are all 50 mm - 250 mm, and the pole pitch d p is 5 mm - 25 mm.

[0041] Among them, the simulation software for simulation in step S502 is ANSYS. The first coil parameters are traversed by means of ANSYS simulation, and the phase difference between the primary and secondary side currents of the LCC-LCC resonant compensation network is 90°.

[0042] In a specific embodiment of the present invention, the Pareto curve is as Figure 8 shown. After obtaining the Pareto curve, the coupling coefficient is obtained. The coupling coefficient generally takes a value of about 0.2 - 0.3. Based on the coupling coefficient, the coil volume is determined on the Pareto curve, and based on the coil volume, the first coil parameters are determined.

[0043] Since the self-inductance value of the primary coil is related to the number of turns. Specifically, as the number of turns increases, the coupling coefficient remains unchanged and the self-inductance continuously increases. This is because the coupling coefficient is related to the disk surface, and the self-inductance is proportional to the square of the number of turns.

[0044] Therefore, the coil self-inductance value is determined based on the initial number of turns and the first coil parameters.

[0045] In a specific embodiment of the present invention, the first circuit parameters include the compensation inductance value, the second compensation capacitance value, and the first compensation capacitance value in the LCC-LCC resonant compensation network. The three parameters can be calculated based on the following formula:

[0046]

[0047]

[0048]

[0049] In the formula, I coil is the coil current stress; I AB is the primary resonant current; I ab is the secondary resonant current; U C1 is the pressure across the first compensation capacitor; U Cf1 is the pressure across the second compensation capacitor; U coil is the coil voltage stress.

[0050] In some embodiments of the present invention, determining the target first coil parameters and target first circuit parameters of the energy transmission system based on the first circuit parameters and the circuit parameter constraint conditions in step S202 includes: Determine whether the first circuit parameter meets the circuit parameter constraint conditions; If it meets the conditions, the first coil parameter is the target first coil parameter, and the first circuit parameter is the target first circuit parameter; If it does not meet the conditions, increment the initial number of turns by one to obtain an updated number of turns, determine the updated coil self-inductance based on the updated number of turns and the first coil parameter, and determine the updated circuit parameter based on the updated coil self-inductance and the gain until the updated circuit parameter meets the circuit parameter constraint conditions.

[0051] In some embodiments of the present invention, determining the circuit parameter constraint conditions based on the index requirements, gain characteristics, stress, and soft-switching range of the energy transfer system includes: Determine the gain curve and coil size constraints based on the index requirements of the energy transfer system; Determine the constraint relationship between the coil self-inductance value and the resonant inductance value of the LCC-LCC resonant compensation network based on the gain curve; Determine the maximum effective value of the resonant current and the maximum effective value of the resonant voltage based on the stress conditions; Determine the lower limit value and the upper limit value of the resonant inductance value based on the soft-switching range.

[0052] Among them, the gain characteristic is that the gain is 1. Based on this characteristic, determine the value range limits of the coil self-inductance value and the resonant inductance value in the relationship curve between the gain curve and the coil self-inductance and the resonant inductance. And the constraint relationship between the coil self-inductance value and the resonant inductance value is: the coil self-inductance value is greater than the resonant inductance value.

[0053] Among them, the stress conditions include that the maximum effective value of the resonant voltage should be less than the air breakdown voltage, and the maximum effective value of the resonant current limiting should be determined based on the loss and current-carrying capacity.

[0054] In a specific embodiment of the present invention, the maximum effective value of the resonant voltage is 4 kV, and the maximum effective value of the resonant current is 20 A.

[0055] Among them, soft switching means that the switching transistor reaches the zero-voltage state when it is turned on, that is: before it is turned on, its leakage voltage needs to drop to zero, and the circuit needs to have a certain ability to extract charge. Therefore, to meet the soft-switching requirements, the current at the switching moment needs to satisfy the following formula:

[0056] In the formula, I AB(t) is the input current at time t; C oss is the parasitic capacitance of the switching transistor; T d is the dead time.

[0057] And the resonant current at the switching moment should be below 5 A to achieve soft switching with less loss.

[0058] Combining the above formula, the upper limit value of the resonant inductor value can be obtained. Specifically, L f1 ≤67.56 μH.

[0059] Define the range Z of soft switching (ZVS):

[0060] Among them, the corresponding relationship between Z and the resonant inductor value is as Figure 9 shown. From Figure 9 and the value of Z, the lower limit value of the resonant inductor value can be determined. Specifically, L f1 <40.53 μH.

[0061] Among them, the coil size constraint refers to the constraint of the difference between the disk width and the width occupied by the Litz wire.

[0062] Among them, the calculation formula for the difference between the disk width and the width occupied by the Litz wire is as follows: S litz =W c -N×D litz In the formula, S litz is the difference between the disk width and the width occupied by the Litz wire; D litz is the diameter of the Litz wire; N is the number of turns.

[0063] It should be noted that: the selection of self-inductance needs to be combined with the selection of the resonant relationship and the number of turns. The relationship between the coupling coefficient and self-inductance and the coil parameters is Figure 10 shown. When the four parameters L i , W i , w c , d p increase, the coil disk surface increases, and the coupling coefficient rises. L i , W i is directly proportional to the coil self-inductance. d p has a small influence on the coil self-inductance, and w c has a non-linear relationship with the coil self-inductance. Combining the relationship diagram and the range of Lp > 9.52 μH, a preliminary design of the coil parameters can be obtained.

[0064] It should also be noted that: the circuit parameter constraint conditions are related to the number of turns, and their corresponding relationship is as Figure 11 shown. Therefore, when the circuit parameters do not meet the circuit parameter constraint conditions, the circuit parameters are adjusted by adjusting the number of turns.

[0065] In a specific embodiment of the present invention, if the first coil of the energy transmission system is a bipolar coil, then the second coil in the information transmission system is a unipolar coil. The magnetic field on the unipolar coil induced by the bipolar coil is a magnetic field with one in and one out, which can form the effect of magnetic field cancellation, thereby minimizing magnetic field overlap and mutual interference as much as possible.

[0066] Specifically, the outer periphery of the second coil coincides with the outer surface of the first coil, and the inner periphery of the second coil is equal to the inner periphery of the first coil. That is, as Figure 12 shown, DW o =2W o +d p 、DW i =2W i +d p 、DL o =L o 、DL i =L i .

[0067] In a specific embodiment of the present invention, the first coil and the second coil are stacked, and the transmitting and receiving side coils are centrosymmetrically distributed. From the outside to the inside, they are an aluminum plate, a magnetic core, the first coil, and the second coil in sequence. The first coil is placed on the outer layer, and the second coil is placed on the inner layer, which can achieve the decoupling of energy and information, and the design is simple. Adding a whole magnetic core to shield EMI interference, although adopting a whole magnetic core design will increase the weight of the coupling mechanism, it reduces magnetic field leakage, and a shorter winding length can achieve the required self-inductance. In addition, the magnetic flux density per unit volume decreases, and the hysteresis loss is reduced.

[0068] In some embodiments of the present invention, the second circuit parameters include the capacitance value and the resistance value in the S-S resonance compensation network; then as Figure 13 shown, determining the second circuit parameters based on the constraints of the second coil parameters, the output voltage, and the conversion time in step S203 includes: S1301. Determine the coil inductance value of the information transmission system based on the second coil parameters; S1302. Determine the capacitance value based on the coil inductance value and the information carrier frequency; S1303. Obtain the correspondence between the conversion time and the resistance value, determine the initial resistance value based on the conversion time and the correspondence, and optimize the initial resistance value based on the output voltage to obtain the resistance value.

[0069] Among them, the output voltage is ±2.5~±5.5V, and the conversion time is less than 5 μs.

[0070] To verify the effectiveness of the joint design method of the separated wireless energy and information synchronous transmission system proposed in the embodiments of the present invention, the target first coil parameters and target first circuit parameters of the energy transmission system designed based on the above design method are shown in Table 1: Table 1 Design parameters of the energy transmission system

[0071] Based on the above design parameters, a MATLAB simulation model is established to measure the input voltage U f and the output voltage U L . The simulation results are as Figure 14 shown. The input and output voltages are both 400V, and the energy transmission voltage gain is one, which is consistent with the previous design.

[0072] Measure the waveforms of the output voltage and current of the inverter bridge on the transmitting side and the output voltage and current of the rectifier bridge on the receiving side in the simulation. As Figure 15 shown, the output current of the inverter bridge on the transmitting side lags slightly behind the voltage, achieving ZVS transmission, which is consistent with the previous design.

[0073] Measure the waveforms of the output voltage and current of the inverter bridge on the transmitting side, the voltage stress of the primary coil, and the voltage stress of the secondary coil in the simulation. As Figure 16 shown, the output current of the inverter bridge on the transmitting side lags slightly behind the voltage, achieving ZVS transmission. The peak voltages of the primary and secondary coils are 3.5kV, meeting the condition of being less than the voltage limit of 4kV.

[0074] In summary, the energy transmission system designed based on the design method in the embodiments of the present invention meets the design requirements.

[0075] The second coil parameters and second circuit parameters of the information transmission system designed based on the above design method in the embodiments of the present invention are shown in Table 2: Table 2 Parameters of the information transmission system

[0076] Substitute the design parameters into the MATLAB simulation with a simulation step of 10 ns. The received resistor voltage U do obtained from the MATLAB simulation is as Figure 17 shown. It can be seen from Figure 17 that the theoretical peak output voltage is 5.075V and the conversion time is 3 μs, which is consistent with the theoretical design, verifying the effectiveness of the design method.

[0077] To better implement the joint design method of the separated wireless energy and information synchronous transmission system in the embodiments of the present invention, correspondingly, based on the joint design method of the separated wireless energy and information synchronous transmission system, the embodiments of the present invention further provide a joint design device for the separated wireless energy and information synchronous transmission system. The separated wireless energy and information synchronous transmission system includes an energy transmission system using an LCC-LCC resonant compensation network, an information transmission system using an S-S resonant compensation network, and an energy and information synchronous transmission magnetic coupling mechanism, as Figure 18 shown. The joint design device 1800 of the separated wireless energy and information synchronous transmission system includes: An equivalent model determination unit 1801, configured to equivalent the energy transmission system and the information transmission system to obtain an energy mutual inductance equivalent model and an information mutual inductance equivalent model; An energy transmission system design unit 1802, configured to determine the first coil parameters and the first circuit parameters of the energy mutual inductance equivalent model, determine the circuit parameter constraint conditions based on the index requirements, gain characteristics, stress conditions, and soft-switching range of the energy transmission system, and determine the target first coil parameters and the target first circuit parameters of the energy transmission system based on the first circuit parameters and the circuit parameter constraint conditions; An information transmission system design unit 1803, configured to determine the second coil parameters of the information mutual inductance equivalent model based on the target first coil parameters, and determine the second circuit parameters based on the second coil parameters and the constraint conditions of the output voltage and the conversion time; A synchronous transmission magnetic coupling mechanism design unit 1804, configured to design an energy and information synchronous transmission magnetic coupling mechanism based on the target first coil parameters, the second coil parameters, and the zero-coupling constraint condition of the information transmission coil.

[0078] The joint design device 1800 of the separated wireless energy and information synchronous transmission system provided in the above embodiment can implement the technical solutions described in the embodiments of the joint design method of the separated wireless energy and information synchronous transmission system. For the specific implementation principles of the above modules or units, reference can be made to the corresponding content in the embodiments of the joint design method of the separated wireless energy and information synchronous transmission system, which will not be elaborated here.

[0079] The above has introduced in detail a joint design method and device for a separated wireless energy and information synchronous transmission system provided by the present invention. Specific examples are used in this article to elaborate on the principles and implementation manners of the present invention. The descriptions of the above embodiments are only used to help understand the method and its core idea of the present invention; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A joint design method for a separate wireless energy information synchronous transmission system, characterized in that: The separated wireless energy information synchronous transmission system includes an energy transmission system using an LCC-LCC resonance compensation network, an information transmission system using an SS resonance compensation network, and an energy information synchronous transmission magnetic coupling mechanism. The method includes: Equivalence is performed between the energy transmission system and the information transmission system to obtain an energy mutual inductance equivalent model and an information mutual inductance equivalent model; Determine a first coil parameter and a first circuit parameter of the energy mutual inductance equivalent model, determine the circuit parameter constraint condition based on the index requirements, gain characteristics, stress conditions and soft switching range of the energy transmission system, and determine a target first coil parameter and a target first circuit parameter of the energy transmission system based on the first circuit parameter and the circuit parameter constraint condition; Determine the second coil parameters of the information mutual inductance equivalent model based on the target first coil parameters, and determine the second circuit parameters based on the second coil parameters and the constraints of the output voltage and the conversion time; Based on the target first coil parameters, the second coil parameters and the information transmission coil zero coupling constraint condition, the energy information synchronous transmission magnetic coupling mechanism is designed.

2. The joint design method of the separated wireless energy information synchronous transmission system according to claim 1 is characterized in that: The determining of the first coil parameter and the first circuit parameter of the energy mutual inductance equivalent model comprises: Determining a first coil parameter of the energy mutual inductance equivalent model and a value range of the first coil parameter; Simulating the first coil parameter based on the value range to obtain a Pareto curve of the coupling coefficient and the coil volume; determining the first coil parameter based on the Pareto curve; Acquire an initial number of turns of a first coil in the energy transmission system, and determine a coil self-inductance value of the first coil based on the initial number of turns and the first coil parameters; The first circuit parameter is determined based on the gain of the energy transfer system and the coil self-inductance value.

3. The joint design method of the separated wireless energy information synchronous transmission system according to claim 2 is characterized in that: The determining of a target first coil parameter and a target first circuit parameter of the energy transmission system based on the first circuit parameter and the circuit parameter constraint condition comprises: Determining whether the first circuit parameter satisfies the circuit parameter constraint condition; If satisfied, the first coil parameter is the target first coil parameter, and the first circuit parameter is the target first circuit parameter; If not satisfied, the initial number of turns is increased by one to obtain an updated number of turns, an updated coil self-inductance is determined based on the updated number of turns and the first coil parameters, and updated circuit parameters are determined based on the updated coil self-inductance and the gain, until the updated circuit parameters meet the circuit parameter constraints.

4. The joint design method of the separated wireless energy information synchronous transmission system according to claim 2 is characterized in that: The circuit parameter constraint conditions are determined based on the index requirements, gain characteristics, stress and soft switching range of the energy transmission system, including: Determining a gain curve and coil size constraints based on the performance requirements of the energy transfer system; Determine a constraint relationship between a coil self-inductance value and a resonant inductance value of the LCC-LCC resonant compensation network based on the gain curve; Determining a maximum effective value of the resonant current and a maximum effective value of the resonant voltage based on the stress condition; A lower limit value and an upper limit value of the resonant inductance value are determined based on the soft switching range.

5. The joint design method of the separated wireless energy information synchronous transmission system according to claim 1 is characterized in that: The first coil of the energy transmission system and the second coil of the information transmission system have the same structure but different polarities.

6. The joint design method of the separated wireless energy information synchronous transmission system according to claim 1 is characterized in that: The second circuit parameters include capacitance and resistance in the SS resonant compensation network; The second circuit parameters are determined based on the second coil parameters and the constraints of the output voltage and the conversion time, including: determining a coil inductance value of the information transmission system based on the second coil parameter; determining a capacitance value based on the coil inductance value and the information carrier frequency; The corresponding relationship between the conversion time and the resistance value is obtained, an initial resistance value is determined based on the conversion time and the corresponding relationship, and the initial resistance value is optimized based on the output voltage to obtain a resistance value.

7. The joint design method of the separated wireless energy information synchronous transmission system according to claim 5 is characterized in that: The first coil and the second coil are both DD type coils, and the first coil parameters and the second coil parameters both include coil width, pole pitch, inner side length, inner side width and number of turns; the first circuit parameters include the compensation inductance value, the second compensation capacitance value and the first compensation capacitance value in the LCC-LCC resonant compensation network.

8. The joint design method of the separated wireless energy information synchronous transmission system according to claim 1 is characterized in that: The energy mutual inductance equivalent model includes a DC voltage source circuit Uf, a primary full-bridge inverter circuit for providing AC power to the energy transmission system, a transmitter compensation network, a receiver compensation network and an output rectifier circuit. The full-bridge inverter circuit includes a first switch tube Q1, a second switch tube Q2, a third switch tube Q3 and a fourth switch tube Q4. The DC voltage source circuit Uf f One end of the DC voltage source circuit U is connected to the first switch tube Q1 and the third switch tube Q3 respectively. f The other end is connected to the second switch tube Q2 and the fourth switch tube Q4 respectively, the first switch tube Q1 is connected to the second switch tube Q2, and the third switch tube Q3 is connected to the fourth switch tube Q4; the transmitter end compensation network includes a first compensation inductor L f1 , the first compensation capacitor C1 and the second compensation capacitor C f1 , the first compensation inductor L f1 One end of the DC voltage source circuit U f At the output end, the first compensation inductor L f1 The other end is connected to the first compensation capacitor C1 and the second compensation capacitor C f1 The transmission coil circuit includes the primary coil L p and the secondary coil L s , primary coil L p One end of the primary coil L is connected to the first compensation capacitor C1. p The other end of the second compensation capacitor C f1 After connection, they are connected to the DC voltage source circuit U f The other output end of the receiving end compensation network includes a second compensation inductor L f2 , the third compensation capacitor C2 and the fourth compensation capacitor C f2 , the second compensation inductor L f2 One end is connected to the output rectifier circuit, and the second compensation inductor L f2 The other end is connected to the third compensation capacitor C2 and the fourth compensation capacitor C f2 , one end of the third compensation capacitor C2 is connected to the secondary coil L s One end of the secondary coil L is connected to the third compensation capacitor C2. s The other end of the fourth compensation capacitor C f2 After connection, they are connected together to the output rectifier circuit; The output rectifier circuit includes a fifth switch tube Q5, a sixth switch tube Q6, a seventh switch tube Q7, an eighth switch tube Q8 and a load resistor R L , load resistance R L One end of each of the load resistors R L The other end is connected to the sixth switch tube Q6 and the eighth switch tube Q8 respectively, the fifth switch tube Q5 is connected to the sixth switch tube Q6, and the seventh switch tube Q7 is connected to the eighth switch tube Q8.

9. The joint design method of the separated wireless energy information synchronous transmission system according to claim 1 is characterized in that: The information mutual inductance equivalent model comprises a primary side envelope detection circuit, a primary side precision rectification circuit, a primary side bandpass filter circuit and a primary side high-pass filter circuit connected in series, a primary side information transmission network connected to two output ends of the primary side high-pass filter circuit, a secondary side information receiving network, a secondary side high-pass filter circuit connected to both ends of the secondary side information receiving network, a secondary side bandpass filter circuit connected in series with the secondary side high-pass filter circuit in sequence, a secondary side precision rectification circuit and a secondary side envelope detection circuit; the primary side information transmission network comprises a primary side first resistor R d1 , and the primary first resistor R d1 The second resistor R in parallel with the primary side dp , and the primary side second resistor R dp The first capacitor C in series d1 , information primary coil, information secondary coil, secondary first resistor R connected in series d2 , the second resistor R ds and the secondary side first capacitor C d2 .

10. A joint design device for a separate wireless energy information synchronous transmission system, characterized in that: The separated wireless energy information synchronous transmission system includes an energy transmission system using an LCC-LCC resonance compensation network, an information transmission system using an SS resonance compensation network, and an energy information synchronous transmission magnetic coupling mechanism, and the device includes: An equivalent model determination unit, used for performing equivalence between the energy transmission system and the information transmission system to obtain an energy mutual inductance equivalent model and an information mutual inductance equivalent model; an energy transmission system design unit, configured to determine a first coil parameter and a first circuit parameter of the energy mutual inductance equivalent model, determine the circuit parameter constraint condition based on the index requirements, gain characteristics, stress conditions and soft switching range of the energy transmission system, and determine a target first coil parameter and a target first circuit parameter of the energy transmission system based on the first circuit parameter and the circuit parameter constraint condition; An information transmission system design unit, configured to determine a second coil parameter of the information mutual inductance equivalent model based on the target first coil parameter, and determine a second circuit parameter based on the second coil parameter and constraints of an output voltage and a conversion time; The synchronous transmission magnetic coupling mechanism design unit is used to design the energy information synchronous transmission magnetic coupling mechanism based on the target first coil parameters, the second coil parameters and the information transmission coil zero coupling constraint condition.

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