WO2021207928A1 - Système et procédé de charge sans fil par résonance magnétique - Google Patents

Système et procédé de charge sans fil par résonance magnétique Download PDF

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Publication number
WO2021207928A1
WO2021207928A1 PCT/CN2020/084688 CN2020084688W WO2021207928A1 WO 2021207928 A1 WO2021207928 A1 WO 2021207928A1 CN 2020084688 W CN2020084688 W CN 2020084688W WO 2021207928 A1 WO2021207928 A1 WO 2021207928A1
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Prior art keywords
receiving end
transmitting end
transmitting
wireless charging
output power
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PCT/CN2020/084688
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English (en)
Chinese (zh)
Inventor
李云辉
祝可嘉
江俊
卢杰
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上海卡珀林智能科技有限公司
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Priority to PCT/CN2020/084688 priority Critical patent/WO2021207928A1/fr
Publication of WO2021207928A1 publication Critical patent/WO2021207928A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries

Definitions

  • the invention relates to the field of wireless power transmission, and particularly refers to a magnetic resonance wireless charging system and method.
  • the eigenmodes of the system are split into two modes with opposite phases due to the near-field action.
  • the modes with the same phase are called symmetric modes (the phase difference between the resonant coils is 0°), and the phases are opposite.
  • the mode is called the anti-symmetric mode (the phase difference between the resonant coils is 180°).
  • the purpose of the present invention is to overcome the shortcomings of the prior art, provide a magnetic resonance wireless charging system and method, and solve the frequency splitting caused by mode coupling in the existing resonance wireless power transmission scheme, the transmission efficiency is reduced, and the system for tracking the frequency scheme Problems such as poor stability and the need for strict symmetrical systems.
  • the present invention provides a magnetic resonance wireless charging method for wireless charging a load, wherein the end connected to the load is used as the receiving end, and the end connected to the power supply is used as the transmitting end.
  • the wireless charging method includes the following steps:
  • Both the transmitting end and the receiving end are provided with resonant coils, and the intrinsic frequencies of the resonant coils are the same;
  • the energy gain rate of the transmitting end and/or the energy loss rate of the receiving end are dynamically adjusted so that the ratio of the output power to the input power falls into the setting Set the range, and keep the wireless power transmission in the orthogonal mode range.
  • the magnetic resonance wireless charging method of the present invention tracks the range of the orthogonal mode during the wireless power transmission process, greatly increases the range of high-efficiency transmission, and has the characteristics of single frequency and high efficiency, that is, the input frequency at the transmitting end during the wireless power transmission process It is a single frequency, so that the charging method of the present invention avoids the design of the frequency tracking circuit and avoids the problem of poor system stability. At the same time, the charging method of the present invention also has strong safety and can effectively solve the resonant wireless power transmission scheme. The problems of frequency splitting and reduced transmission efficiency due to mode coupling, poor system stability of the frequency tracking scheme and the need for a strictly symmetrical system.
  • a further improvement of the magnetic resonance wireless charging method of the present invention is that when the energy gain rate of the transmitting end and the energy loss rate of the receiving end are dynamically adjusted, the method further includes:
  • the further improvement of the magnetic resonance wireless charging method of the present invention lies in that it also includes:
  • a transmission impedance adjustment module is connected to the resonant coil of the transmitting end; and/or a receiving impedance adjustment module is connected to the resonant coil of the receiving end;
  • the energy gain rate of the transmitting end is adjusted by adjusting the impedance of the transmitting impedance adjusting module, and/or the energy loss rate of the receiving end is adjusted by adjusting the impedance of the receiving impedance adjusting module.
  • the further improvement of the magnetic resonance wireless charging method of the present invention lies in that it also includes:
  • the further improvement of the magnetic resonance wireless charging method of the present invention lies in that it also includes:
  • the input frequency at the resonance coil of the transmitting end is set to a frequency value within a set frequency range, and the set frequency range is ⁇ 0 -1% ⁇ 0 to ⁇ 0 +1% ⁇ 0 , where ⁇ 0 Is the intrinsic frequency of the resonant coil of the transmitting end.
  • the present invention also provides a magnetic resonance wireless charging system for wireless charging a load, wherein the end connected to the load is used as the receiving end, and the end connected to the power supply is used as the transmitting end, and the wireless charging system includes:
  • a resonance coil provided at the transmitting end
  • a resonant coil provided at the receiving end, the resonant coil of the receiving end is coupled to the resonant coil of the transmitting end to realize wireless power transmission, and the intrinsic frequencies of the resonant coils of the transmitting end and the receiving end are the same;
  • the input power monitoring module connected to the transmitting terminal is used to monitor the input power of the transmitting terminal
  • a processing module connected in control with both the transmitting end and the receiving end, the processing module is also connected to the input power monitoring module and the output power monitoring module, and is configured to receive the input power and the output power , And dynamically adjust the energy gain rate of the transmitting end and/or the energy loss rate of the receiving end according to the ratio of the output power to the input power so that the ratio of the output power to the input power falls Enter the set range, and keep the wireless power transmission in the orthogonal mode range.
  • a further improvement of the magnetic resonance wireless charging system of the present invention is that when the energy gain rate of the transmitting end and the energy loss rate of the receiving end are dynamically adjusted, the processing module dynamically adjusts the receiving end after the wireless power transmission starts.
  • the energy loss rate of the wireless power transmission terminal is in the range of the orthogonal mode; and then the energy gain rate of the transmitting terminal and the energy loss rate of the receiving terminal are dynamically adjusted to keep the wireless power transmission in the orthogonal mode range.
  • a further improvement of the magnetic resonance wireless charging system of the present invention is that it further includes a transmitting impedance adjustment module at the resonance coil connected to the transmitting end and/or a receiving impedance adjusting module at the resonance coil connected to the receiving end;
  • the processing module is connected to the transmission impedance adjustment module and/or the reception impedance adjustment module, and adjusts the energy gain rate of the transmitting end by adjusting the impedance of the transmission impedance adjustment module, and/or by adjusting the
  • the impedance of the receiving impedance adjusting module is used to adjust the energy loss rate of the receiving end.
  • a further improvement of the magnetic resonance wireless charging system of the present invention is that a low limit is set in the processing module;
  • the processing module compares and judges whether the ratio of the output power to the input power is lower than the lower limit, and when the ratio of the output power to the input power is lower than the lower limit, When the limit is set, the energy gain rate of the transmitting end and/or the energy loss rate of the receiving end are dynamically adjusted until the ratio of the output power to the input power falls within the set range.
  • a further improvement of the magnetic resonance wireless charging system of the present invention is that it also includes a high-frequency inverter module arranged at the transmitting end and connected to the resonant coil of the transmitting end, for inputting high-frequency electromagnetic waves to the resonant coil of the transmitting end,
  • the frequency range of the input high-frequency electromagnetic wave is between ⁇ 0 -1% ⁇ 0 to ⁇ 0 +1% ⁇ 0 , where ⁇ 0 is the intrinsic frequency of the resonance coil at the transmitting end.
  • Fig. 1 is a system diagram of the magnetic resonance wireless charging system of the present invention.
  • Figure 2 is a physical model diagram of the magnetic resonance wireless charging system of the present invention.
  • Fig. 3 is a model diagram of the first embodiment of the magnetic resonance wireless charging system of the present invention.
  • Fig. 4 is a model diagram of the second embodiment of the magnetic resonance wireless charging system of the present invention.
  • Fig. 5 is a model diagram of the third embodiment of the magnetic resonance wireless charging system of the present invention.
  • Fig. 6 is a model diagram of the fourth embodiment of the magnetic resonance wireless charging system of the present invention.
  • Fig. 7 is a schematic diagram of the variation of the working frequency of the resonant coil of the magnetic resonance wireless charging system according to the near-field coupling strength of the present invention.
  • FIG. 8 is a schematic diagram of the phase difference of the resonance coil of the magnetic resonance wireless charging system of the present invention changing with the near-field coupling strength.
  • Fig. 9 is a pattern change diagram of a resonant wireless charging system.
  • Fig. 10 is a graph showing the change of the energy loss rate of the receiving end in the magnetic resonance wireless charging system of the present invention.
  • Fig. 11 is a graph showing the change of the energy gain rate of the transmitting end in the magnetic resonance wireless charging system of the present invention.
  • FIG. 12 is a graph showing changes in energy transmission efficiency and phase difference of resonance coils of the magnetic resonance wireless charging system of the present invention under different coupling intensities.
  • the present invention provides a magnetic resonance wireless charging system and method for wireless charging of a load, which is used to solve the problem of frequency splitting caused by mode near-field coupling in the existing resonance wireless power transmission scheme and low transmission efficiency. Problem; It is also used to solve the problem of poor system stability in the tracking frequency scheme.
  • the magnetic resonance wireless charging system of the present invention is based on the orthogonal mode, which maximizes the energy transmission efficiency of the system by controlling the energy gain rate of the transmitting end and/or the energy loss rate of the receiving end, and has the characteristics of single frequency and high efficiency, and realizes the orthogonal mode Tracking and locking can greatly increase the range of high-efficiency transmission.
  • the magnetic resonance wireless charging system and method of the present invention will be described below in conjunction with the accompanying drawings.
  • FIG. 1 a system diagram of the magnetic resonance wireless charging system of the present invention is shown. The following describes the magnetic resonance wireless charging system of the present invention with reference to FIG. 1.
  • the magnetic resonance wireless charging system provided by the present invention is used to wirelessly charge a load.
  • the end connected to the load is used as the receiving end, and the end connected to the power supply is used as the transmitting end.
  • the magnetic resonance wireless charging system includes a transmitting end.
  • the resonant coil 22 at the receiving end is arranged at the receiving end and is coupled to the resonant coil 21 at the transmitting end to realize wireless power transmission, and the intrinsic frequency of the resonant coil 21 at the transmitting end and the resonant coil 22 at the receiving end are the same.
  • the resonant coil 22 at the receiving end receives the high-frequency electromagnetic waves emitted by the resonant coil 21 at the transmitting end, and then converts the high-frequency electromagnetic waves into direct current at the receiving end for use by the load.
  • the input power monitoring module 24 is connected to the transmitting terminal to monitor the input power of the transmitting terminal; the output power monitoring module 25 is connected to the receiving terminal to monitor the output power of the receiving terminal; the processing module 23 is connected to the transmitting terminal and the receiving terminal in a control manner.
  • the processing module 23 is connected to the circuit control of the transmitting end and the receiving end, and the parameters at the transmitting end and the receiving end are adjusted by controlling the circuits of the transmitting end and the receiving end.
  • the processing module 23 is also connected to the input power monitoring module 24 and the output power monitoring module 25.
  • the processing module 23 is used to receive input power and output power, and calculate the ratio of output power to input power, and based on the ratio of output power to input power ,
  • the energy gain rate of the transmitting end and/or the energy loss rate of the receiving end are dynamically adjusted so that the ratio of output power to input power falls within the set range, and the wireless power transmission is kept within the orthogonal mode range.
  • the processing module 23 has three adjustment modes. The first is to dynamically adjust the energy gain rate of the transmitting end to make the ratio of the output power to the input power fall within the set range, that is, to adjust the transmitting end separately. The second is to dynamically adjust the energy loss rate of the receiving end to make the ratio of output power to input power fall within the set range, that is, to adjust the receiving end separately. The third is to dynamically adjust the energy gain rate of the transmitting end and the capacity loss rate of the receiving end, that is, double-ended adjustment.
  • the intrinsic frequency of the resonant coil 21 at the transmitting end and the resonant coil 22 at the receiving end is determined by the material and structure of the coil itself, and has nothing to do with the space position and coupling state of the coil, and is also called the natural frequency of the coil.
  • the orthogonal mode referred to in the present invention is a lossless mode with one and only one operating frequency at the intrinsic frequency in the weakly coupled region of the double resonance system. As shown in Figure 9, the curve F1 represents the orthogonal mode In the orthogonal mode, if the input frequency of the transmitting end is the intrinsic frequency ⁇ 0 , the power transmission efficiency of the wireless charging system is at the maximum value, that is, the power transmission efficiency is the highest.
  • P in Figure 9 represents the frequency of the system, and X represents the transmission coefficient, which is specifically calculated by the root of the wireless power transmission efficiency.
  • the voltage or current of the resonant coils at the transmitting end and the receiving end are in orthogonal phase, that is, the phase difference is 90°.
  • the orthogonal mode range in the present invention means that the phase difference of the voltage or current of the resonant coil at the transmitting end and the receiving end is between 85° and 95°, that is, within a range close to the orthogonal mode.
  • the magnetic resonance wireless charging system of the present invention realizes the effects of locking frequency, locking efficiency and locking power based on the orthogonal mode and/or orthogonal mode range.
  • the locking frequency refers to the realization of the magnetic resonance wireless charging system in the orthogonal mode.
  • Three-frequency integration that is, the intrinsic frequency of the resonant coil at the transmitter and receiver, the system mode frequency (the system mode frequency is closely related to the coupling state of the two coils), and the input frequency of the transmitter end of the system are the same, so that the wireless charging During the process, the transmitter is always input to the resonance coil of the transmitter at a fixed input frequency.
  • ⁇ ⁇ is the system mode frequency
  • ⁇ 0 is the intrinsic frequency of the resonant coil
  • i is the symbol of the imaginary part
  • k is the near-field coupling strength between the resonant coils
  • g is the energy gain rate of the resonant coil at the transmitting end
  • ⁇ is the receiving The energy loss rate of the resonance coil at the end.
  • the magnetic resonance wireless charging system uses a pair of resonance coils with the same intrinsic frequency as the energy transmission carrier.
  • the system formed by the near-field coupling of the coils will have eigenmodes, the real part of which represents the mode
  • the eigen frequency of is also called the system mode frequency ⁇ ⁇
  • the imaginary part represents the loss of the mode.
  • the eigenmodes of the system split, as shown in Figure 7 and Figure 8.
  • the near-field coupling strength of the system is high, the system mode splits into a symmetric mode ⁇ + and an anti-symmetric mode ⁇ - .
  • the coupling strength of the resonant coils at both ends will change sharply, and the working mode of the system will also change.
  • the system is in an over-coupling state.
  • the card mode will split from ⁇ 0 to ⁇ 0 ⁇ k (symmetrical mode and antisymmetrical mode, respectively). );
  • the intrinsic mode loss at ⁇ 0 will increase, and the over-coupling state and the under-coupling state will both cause the energy transmission efficiency to decrease.
  • the orthogonal mode of the present invention is different from the above-mentioned symmetric mode ⁇ + and anti-symmetric mode ⁇ - .
  • the symmetric mode ⁇ + and anti-symmetric mode ⁇ - finally When ⁇ 0 merges into an orthogonal mode, the phase difference between the two resonant coils is almost 90°. At this time, the system enters the weak coupling region.
  • the transmission distance changes, by dynamically adjusting the energy gain rate and/or energy loss rate of the resonant coil, the system is always in the orthogonal mode and/or within the range of the orthogonal mode, which realizes the orthogonal mode and the orthogonal mode.
  • the energy gain rate of the transmitting end of the present invention refers to the rate at which the energy amplitude increases due to channel coupling.
  • the channel coupling here refers to the coupling relationship between the circuit and/or coil at the transmitting end and the resonance coil of the transmitting end, which is used for The resonant coil inputs energy.
  • the energy loss rate at the receiving end of the present invention refers to the rate at which the channel coupling causes the energy amplitude to decrease.
  • the channel coupling here refers to the coupling relationship between the circuit and/or coil at the receiving end and the resonant coil at the receiving end, which is used to resonate from the receiving end. Energy is received at the coil.
  • the system operation start-up voltage output is generally 40V start.
  • the processing module slowly increases the energy gain rate of the transmitting end , Until the ratio of output power to input power falls within the set range, that is, the system enters the quadrature mode range. Then in the process of wireless power transmission, the processing module 23 monitors the change in the ratio of output power to input power in real time, and performs dynamic tracking. When it changes, it can control the ratio of output power to input power within the set range. That is to maintain the system stable in the orthogonal mode.
  • the processing module can adjust the gain rate of the transmitting end by adjusting the impedance in the transmitting end circuit.
  • the processing module when the energy loss rate of the receiving end is adjusted separately, the system is running, and the loss rate of the receiving end is set to infinity at the beginning.
  • the processing module slowly reduces the energy of the receiving end The loss rate is adjusted until the ratio of output power to input power falls within the set range, that is, the system enters the quadrature mode range.
  • the processing module 23 monitors the change in the ratio of output power to input power in real time, and performs dynamic tracking. When it changes, it can control the ratio of output power to input power within the set range. That is to maintain the system in a stable resonance mode.
  • the processing module can adjust the gain rate of the receiving end by adjusting the impedance of the receiving end. By adjusting the impedance in the receiving end circuit, the energy loss rate of the receiving end can be adjusted correspondingly.
  • the processing module 23 dynamically adjusts the energy loss rate of the receiving end so that the wireless power transmission is within the range of the orthogonal mode; and then dynamically adjusts the transmission.
  • the energy gain rate at the end and the energy loss rate at the receiving end to keep the wireless power transmission in the orthogonal mode range.
  • the processing module 23 of the present invention first adjusts the energy loss rate ⁇ of the receiving end, which can make the system quickly in the orthogonal mode and improve the efficiency of the orthogonal mode locking of the system. However, due to the low energy gain efficiency of the transmitting end, the output power of the system is also low. After being in the quadrature mode, the processing module 23 slowly increases the energy gain efficiency g of the transmitting end and reduces the energy loss rate ⁇ of the transmitting end. The system maintains the conditions within the quadrature mode, and the system output power will rise and maintain a higher efficiency during adjustment until the system is fully loaded. This approach realizes the improvement of the energy transmission power of the system while keeping the orthogonal mode or the range of the orthogonal mode of the system unchanged.
  • the magnetic resonance wireless charging system of the present invention further includes a transmission impedance adjustment module 26 connected to the resonance coil 21 at the transmitting end and/or a resonance coil connected to the receiving end.
  • the processing module 23 is connected to the transmitting impedance adjusting module 26 and/or the receiving impedance adjusting module 27, and adjusting the impedance of the transmitting impedance adjusting module 26 to adjust the energy gain rate of the transmitting end, and/or adjusting
  • the impedance of the receiving impedance adjusting module 27 is used to adjust the energy loss rate of the receiving end.
  • R1 represents the impedance of the transmitting impedance adjustment module 26, g is a function of R1, that is, the energy gain efficiency of the transmitting end of the system that adjusts the impedance R1 will also change, s represents the distance between the resonant coils, and k is s. Function, that is, as the distance s changes, the incoming coupling strength of the system will also change.
  • R2 represents the impedance of the receiving impedance adjustment module 27, and ⁇ is a function of R2, that is, the energy loss efficiency of the receiving end of the system that adjusts the impedance R2 is also Will change.
  • the transmitting impedance adjusting module 26 when separately adjusting the energy gain rate of the transmitting end, the transmitting impedance adjusting module 26 is connected to the transmitting end.
  • the receiving impedance adjustment module 27 is connected to the receiving end.
  • the transmitting impedance adjusting module 26 and the receiving impedance adjusting module 27 are respectively connected to the transmitting end and the receiving end.
  • the transmitting impedance adjusting module 26 and the receiving impedance adjusting module 27 of the present invention can be composed of a pure circuit, or a pure coil, or a circuit and a coil.
  • the pure circuit can be a buck topology type circuit, a boost topology type circuit or other circuit topologies that use field effect transistors (MOSFET) to achieve output control.
  • MOSFET field effect transistors
  • Figure 3 it shows a schematic diagram of the pure circuit composition.
  • the processing module adjusts the energy gain rate and energy loss rate accordingly by adjusting the impedance. Connect -R1 to the resonance coil 21 at the transmitting end, and connect +R2 to the resonance coil 21 at the receiving end.
  • FIG. 4 shows a schematic diagram of the pure coil composition.
  • the resonant coil 21 at the transmitter is coupled with a transmitter non-resonant coil 31, and the resonant coil 22 at the receiver is coupled with a receiver non-resonant coil 32.
  • the processing module can adjust the transmitter
  • the number of turns of the non-resonant coil 31 and the non-resonant coil 32 at the receiving end are used to adjust the energy gain rate and the energy loss rate.
  • Figure 5 and Figure 6 the circuit and coil composition diagrams are shown.
  • a transmitting non-resonant coil 31 is coupled to the resonant coil 21 at the transmitting end, and the resonant coil 22 at the receiving end is connected to a pure circuit.
  • a non-resonant coil 32 at the receiving end is coupled to the resonant coil 22 at the receiving end, and the resonant coil 21 at the transmitting end is connected to a pure circuit. Designing a non-resonant coil at the transmitting end makes the system in an open circuit state during the no-load phase, which can well avoid the risk of burning the circuit due to excessive no-load power of the normal magnetic resonance system, and further increase the stability of the system.
  • the processing module 23 has a low limit; the processing module compares and judges whether the ratio of the output power to the input power is lower than the low limit during the wireless power transmission process. When the ratio of the input power is lower than the low limit, the energy gain rate of the transmitting end and/or the energy loss rate of the receiving end are dynamically adjusted until the ratio of the output power to the input power falls within the set range.
  • the processing module 23 does not dynamically adjust the voltage of the transmitting terminal when the ratio of output power to input power exceeds the set range, but sets a lower low limit, and when the ratio is lower than the low limit, it performs dynamic adjustment in time .
  • the above-mentioned setting range is designed according to the coupling strength between coils corresponding to the energy transmission efficiency corresponding to the frequency ⁇ 0 in FIG. 9, and the setting range is preferably 0.85 to 1.
  • the lower limit is preferably 0.8.
  • the ratio of the output power to the input power is the energy transmission efficiency.
  • the wireless energy transmission efficiency will have an impact.
  • the ratio of output power to input power can be monitored in real time. The change of wireless energy transmission efficiency can be monitored.
  • the input power monitoring module 24 of the present invention is connected to the transmitting end of the magnetic resonance wireless charging system of the present invention, and is used to monitor the current and voltage of the resonance coil 21 input to the transmitting end, and it is calculated by using the monitored current and voltage input power.
  • the current in the Hall element detection circuit can be connected to the circuit, and the voltage in the circuit can be detected by a voltage divider resistor.
  • the output power monitoring module 25 is connected to the receiving end of the magnetic resonance wireless charging system of the present invention, and is used to monitor the current and voltage input to the load, and calculate the output power by using the monitored current and voltage.
  • the current in the Hall element detection circuit can be connected to the circuit, and the voltage in the circuit can be detected by a voltage divider resistor.
  • a protection circuit module is connected to both the transmitting end and the receiving end, which is used to cut off the circuits of the transmitting end and the receiving end when the current and voltage in the circuits of the transmitting end and the receiving end exceed the protection range. Realize the overvoltage and undervoltage and overcurrent and undercurrent protection of the transmitter and receiver.
  • the protection circuit module includes a Vin monitoring submodule, an Iin monitoring submodule, and an input impedance control submodule.
  • the Vin monitoring submodule and Iin monitoring submodule are used to monitor the current and voltage in the circuit, and the current and voltage can be input to the processor.
  • the processing module 23 determines whether the current and voltage are within the protection range, and if not, the circuit is disconnected by adjusting the input impedance adjusting sub-module 253.
  • the present invention further includes a high-frequency inverter module arranged at the transmitting end and connected to the resonant coil of the transmitting end for inputting high-frequency electromagnetic waves to the resonant coil of the transmitting end.
  • the frequency range is between ⁇ 0 -1% ⁇ 0 to ⁇ 0 +1% ⁇ 0 , where ⁇ 0 is the intrinsic frequency of the resonance coil at the transmitting end.
  • the frequency of the high-frequency electromagnetic wave input to the resonance coil of the transmitting end is the input frequency ⁇ working of the transmitting end.
  • the high-frequency inverter module is preferably a DC-AC high-frequency inverter module, and the DC-AC high-frequency inverter module It is connected to the power supply and is also connected to the resonance coil 21 at the transmitting end.
  • the DC-AC high-frequency inverter module is used to convert direct current into high-frequency electromagnetic waves and send them to the resonance coil 21 at the transmitting end.
  • the frequency range of the high-frequency electromagnetic waves is 1kHz ⁇ 20MHz, and the present invention sets the frequency of the high-frequency electromagnetic wave output by the DC-AC high-frequency inverter module within a range, which is between ⁇ 0 -1% ⁇ 0 and ⁇ 0 +1% ⁇ 0 .
  • the module locks the system in the range of the orthogonal mode, which makes the energy transmission efficiency of the system reach a greater.
  • the frequency of the high-frequency electromagnetic wave is the intrinsic frequency of the resonant coil at the transmitting end, and the energy transmission efficiency of the system is maximized at this time.
  • the power supply provides 220V, 50Hz access to mains power for the system
  • an AC-DC rectification and voltage reduction module is connected between the power supply and the DC-AC high-frequency inverter module for rectification and voltage reduction of the mains , Make it into 5V ⁇ 310V DC voltage, and send it to the DC-AC high frequency inverter module.
  • An AC-DC high-frequency rectifier module is connected to the resonant coil 22 at the receiving end to convert the high-frequency electromagnetic wave into direct current and then supply the load.
  • Figure 10 shows the relationship between the input voltage of the receiving end and the loss rate in the quadrature mode. The increase in loss rate gradually decreases.
  • Figure 11 shows the relationship between the output voltage of the transmitter and the gain rate in the quadrature mode, as the output voltage increases. The large gain rate gradually becomes larger.
  • the orthogonal mode system achieves efficient transmission in a large span of coupling strength.
  • the system coupling strength is lower than 2kHz, the overall energy transmission efficiency ⁇ of the system decreases slowly, as shown in Figure 12. Line part.
  • the high-efficiency transmission of wireless charging energy based on the physical principle of the orthogonal mode has the characteristics of single frequency and high efficiency; the use of the transmitter gain adjustment and/or the receiver loss adjustment to achieve orthogonal mode tracking can greatly increase the range of high-efficiency transmission;
  • the system exhibits open circuit characteristics at no load, with strong stability and safety; it can realize the regulation of system power output.
  • the present invention also provides a magnetic resonance wireless charging method.
  • the magnetic resonance wireless charging method will be described below.
  • a magnetic resonance wireless charging method of the present invention is used to wirelessly charge a load, wherein the end connected to the load is used as the receiving end, and the end connected to the power supply is used as the transmitting end.
  • the wireless charging method includes the following steps:
  • Both the transmitting end and the receiving end are equipped with resonant coils, and the intrinsic frequencies of the resonant coils are the same;
  • the ratio of output power to input power dynamically adjust the energy gain rate of the transmitting end and/or the energy loss rate of the receiving end to make the ratio of output power to input power fall within the set range, and keep the wireless power transmission in quadrature mode Within range.
  • the magnetic resonance wireless charging method of the present invention can realize high-efficiency wireless charging of the load through the processing module in the above-mentioned magnetic resonance wireless charging system.
  • the principle of high-efficiency transmission of electric energy is the same as that of the above-mentioned processing module. For the same, please refer to the above specific description, which will not be repeated here.
  • the method when dynamically adjusting the energy gain rate of the transmitting end and the energy loss rate of the receiving end, the method further includes:
  • a transmission impedance adjustment module is connected to the resonance coil of the transmitting end, and/or a receiving impedance adjustment module is connected to the resonance coil of the receiving end;
  • the energy gain rate of the transmitting end is adjusted by adjusting the impedance of the transmitting impedance adjusting module, and/or the energy loss rate of the receiving end is adjusted by adjusting the impedance of the receiving impedance adjusting module.
  • the further improvement of the magnetic resonance wireless charging method of the present invention lies in that it also includes:
  • the input frequency at the resonance coil of the transmitting end is set to a frequency value within a set frequency range, the set frequency range is from ⁇ 0 -1% ⁇ 0 to ⁇ 0 +1% ⁇ 0 , where ⁇ 0 is all
  • the eigenfrequency of the resonant coil at the transmitting end In this frequency range, the power transmission can be in the quadrature mode range.
  • the input frequency of the resonance coil at the transmitting end is set to the eigenfrequency of the resonance coil at the transmitting end, and the energy transmission efficiency at this time is maximized.

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  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

L'invention concerne un système et un procédé de charge sans fil par résonance magnétique, qui sont utilisés pour charger sans fil une charge. L'extrémité reliée à la charge sert d'extrémité de réception et l'extrémité reliée à une source d'alimentation en puissance sert d'extrémité de transmission. Le procédé comprend les étapes suivantes consistant à : fournir respectivement une bobine de résonance à une extrémité de transmission et une extrémité de réception, les bobines de résonance ayant la même fréquence propre ; coupler et connecter les bobines de résonance de l'extrémité de transmission et de l'extrémité de réception de façon à réaliser une transmission d'énergie électrique sans fil ; après le démarrage de la transmission d'énergie électrique sans fil, surveiller la puissance d'entrée de l'extrémité de transmission et la puissance de sortie de l'extrémité de réception ; et en fonction du rapport de la puissance de sortie à la puissance d'entrée, ajuster dynamiquement le taux de gain d'énergie de l'extrémité de transmission et/ou le taux de perte d'énergie de l'extrémité de réception, de telle sorte que le rapport de la puissance de sortie à la puissance d'entrée soit compris dans une plage définie et la transmission d'énergie électrique sans fil soit maintenue dans une plage de mode orthogonal. Au moyen du suivi d'un mode orthogonal pendant un processus de transmission d'énergie électrique sans fil, la plage de transmission à haut rendement est agrandie. La présente invention présente les caractéristiques d'une seule fréquence et d'un rendement élevé et présente également une stabilité et une sécurité relativement fortes.
PCT/CN2020/084688 2020-04-14 2020-04-14 Système et procédé de charge sans fil par résonance magnétique WO2021207928A1 (fr)

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