WO2014162766A1 - 無線電力伝送装置、無線電力伝送装置の供給電力制御方法、及び、無線電力伝送装置の製造方法 - Google Patents
無線電力伝送装置、無線電力伝送装置の供給電力制御方法、及び、無線電力伝送装置の製造方法 Download PDFInfo
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- WO2014162766A1 WO2014162766A1 PCT/JP2014/052049 JP2014052049W WO2014162766A1 WO 2014162766 A1 WO2014162766 A1 WO 2014162766A1 JP 2014052049 W JP2014052049 W JP 2014052049W WO 2014162766 A1 WO2014162766 A1 WO 2014162766A1
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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
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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
- H02J50/50—Circuit arrangements or systems for wireless supply or distribution of electric power using additional energy repeaters 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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
Definitions
- the present invention relates to a wireless power transmission device capable of adjusting power for wireless power transmission, a method for controlling power supplied to the wireless power transmission device, and a method for manufacturing the wireless power transmission device.
- a wireless power transmission technology a technology for performing power transmission using resonance and electromagnetic induction between coils included in a power feeding device and a power receiving device (see, for example, Patent Document 1), a resonance included in a power feeding device and a power receiving device.
- a technique for transmitting power by coupling a magnetic field using a resonance phenomenon (magnetic field resonance state) between devices (coils) see, for example, Patent Document 2.
- the power received by the power receiving device with respect to the power supplied to the power feeding device in order to reduce the power loss during wireless power transmission. It is required to increase the power transmission efficiency, which is the ratio of
- the power transmission efficiency is maximized by matching the resonance frequency of the coil included in the power supply device with the resonance frequency of the coil included in the power reception device. It is generally known that the power transmission efficiency can be maximized, and the resonance frequency of the coil included in the power supply device is designed to match the resonance frequency of the coil included in the power reception device. Is common.
- the capacity of the coils and capacitors of the power supply device and the power reception device is also a parameter that determines the power to be supplied to the power-supplied device such as the rechargeable battery to which the power is supplied, so the capacity of the coils and capacitors can be adjusted. desirable.
- an object of the present invention is to maintain the power transmission efficiency, while maintaining the power transmission device and the capacity of the coil and capacitor provided in the power receiving device, that is, the resonance frequency of the coil provided in the power feeding device and / or the coil provided in the power receiving device.
- the wireless power transmission device capable of controlling the power to be supplied by adjusting the resonance frequency of the coil included in the power supply device and / or the resonance frequency of the coil included in the power receiving device.
- An object of the present invention is to provide a power control method and a method of manufacturing a wireless power transmission device.
- One of the inventions for solving the above problems is a supply power of a wireless power transmission device that supplies power by changing a magnetic field from a power supply module including a power supply resonator to a power reception module including the power reception resonator.
- a control method By adjusting a resonance frequency of at least one of the power feeding resonator and the power receiving resonator, an input impedance value of the wireless power transmission device is set to control the supplied power.
- One of the inventions for solving the above problems is a supply power of a wireless power transmission device that supplies power by changing a magnetic field from a power supply module including a power supply resonator to a power reception module including the power reception resonator.
- a control method When the resonance frequency of the power supply resonator matches the resonance frequency of the power reception resonator, the value of the transmission characteristic with respect to the drive frequency of the power supplied to the power supply module, or the power supply resonator and the power reception resonance Use the value of the coupling coefficient between the power supply and the reference value to define the power transmission efficiency.
- the resonance frequency of at least one of the power feeding resonator and the power receiving resonator within a desired range including the reference value, the power supplied by setting the input impedance value of the wireless power transmission device It is characterized by controlling.
- the value of the transmission characteristic with respect to the driving frequency of the power supplied to the power supply module or the power supply resonance is used as a reference value that defines the power transmission efficiency (the ratio of the power received by the power receiving module to the power supplied to the power supply module).
- a desired range including the reference value is set so that the resonance frequency of at least one of the power feeding resonator and the power receiving resonator can be changed within the desired range including the reference value. Then, by changing the resonance frequency of at least one of the power feeding resonator and the power receiving resonator, it is possible to adjust the power supplied by setting the input impedance value of the wireless power transmission device while maintaining the power transmission efficiency. it can.
- One of the inventions for solving the above-described problems is that, in the supply power control method for the wireless power transmission device, at least a power reception resonator and a power reception coil are provided from a power supply module including at least a power supply coil and a power supply resonator. It is characterized in that power is supplied to the power receiving module by a resonance phenomenon.
- the resonance frequency of the resonator and the resonance frequency of the power receiving resonator are matched, the value of the transmission characteristic with respect to the drive frequency of the power supplied to the power supply module, or between the power supply resonator and the power reception resonator The value of the coupling coefficient between them is used as a reference value that defines power transmission efficiency.
- a desired range including the reference value is set, and within the desired range including the reference value, the feed resonator And the resonance frequency of at least one of the power receiving resonators can be changed. Then, by changing the resonance frequency of at least one of the power feeding resonator and the power receiving resonator, it is possible to adjust the power supplied by setting the input impedance value of the wireless power transmission device while maintaining the power transmission efficiency. it can.
- the value of the transmission characteristic relative to the drive frequency of the power supplied to the power supply module is the power supply module and the power reception module.
- Variable parameters configuring the power supply module and the power reception module are set so as to have a bimodal characteristic having peaks in a drive frequency band lower than the resonance frequency and a drive frequency band higher than the resonance frequency.
- the resonance frequency of the power feeding resonator is adjusted based on the characteristic that the value of the input impedance of the wireless power transmission device decreases as the resonance frequency of the power feeding resonator increases.
- the drive frequency of the power supplied to the power supply module is lower than the resonance frequency in the power supply module and the power reception module after the transmission characteristic value with respect to the drive frequency has a bimodal characteristic.
- the band corresponding to the peak value of the transmission characteristic appearing in the frequency band it is possible to obtain a characteristic in which the value of the input impedance of the wireless power transmission device decreases as the resonance frequency of the power feeding resonator increases.
- the value of the input impedance of the wireless power transmission device is set based on the characteristic that the value of the input impedance of the wireless power transmission device decreases as the resonance frequency of the power feeding resonator increases, and the power supplied is adjusted accordingly. be able to.
- the value of the transmission characteristic relative to the drive frequency of the power supplied to the power supply module is the power supply module and the power reception module.
- Variable parameters configuring the power supply module and the power reception module are set so as to have a bimodal characteristic having peaks in a drive frequency band lower than the resonance frequency and a drive frequency band higher than the resonance frequency.
- the resonance frequency of the power receiving resonator is adjusted based on the characteristic that the value of the input impedance of the wireless power transmission device increases as the resonance frequency of the power receiving resonator increases.
- the drive frequency of the power supplied to the power supply module is lower than the resonance frequency in the power supply module and the power reception module after the transmission characteristic value with respect to the drive frequency has a bimodal characteristic.
- the band corresponding to the peak value of the transmission characteristic appearing in the frequency band it is possible to obtain a characteristic in which the value of the input impedance of the wireless power transmission device increases as the resonance frequency of the power receiving resonator increases.
- the value of the input impedance of the wireless power transmission device is set based on the characteristic that the value of the input impedance of the wireless power transmission device decreases as the resonance frequency of the power receiving resonator increases, and the power supplied is adjusted accordingly. be able to.
- One of the inventions for solving the above-described problems is that, in the method for controlling the supply power of the wireless power transmission apparatus, the value of the transmission characteristic with respect to the drive frequency of the power supplied to the power supply module is Variable parameters configuring the power supply module and the power reception module are set so as to have a bimodal characteristic having peaks in a drive frequency band lower than the resonance frequency and a drive frequency band higher than the resonance frequency.
- the resonance frequency of the power feeding resonator is adjusted based on the characteristic that the value of the input impedance of the wireless power transmission device increases as the resonance frequency of the power feeding resonator increases.
- the drive frequency of the power supplied to the power supply module is set to be higher than the resonance frequency in the power supply module and the power reception module after the transmission characteristic value with respect to the drive frequency has a bimodal characteristic.
- the band corresponding to the peak value of the transmission characteristic appearing in the frequency band it is possible to obtain a characteristic in which the value of the input impedance of the wireless power transmission device increases as the resonance frequency of the power feeding resonator increases.
- the value of the input impedance of the wireless power transmission device is set based on the characteristic that the value of the input impedance of the wireless power transmission device increases as the resonance frequency of the power feeding resonator increases, and the power supplied is adjusted accordingly. be able to.
- the value of the transmission characteristic relative to the drive frequency of the power supplied to the power supply module is the power supply module and the power reception module.
- Variable parameters configuring the power supply module and the power reception module are set so as to have a bimodal characteristic having peaks in a drive frequency band lower than the resonance frequency and a drive frequency band higher than the resonance frequency.
- the resonance frequency of the power receiving resonator is adjusted based on a characteristic that the value of the input impedance of the wireless power transmission device decreases as the resonance frequency of the power receiving resonator increases.
- the drive frequency of the power supplied to the power supply module is set to be higher than the resonance frequency in the power supply module and the power reception module after the transmission characteristic value with respect to the drive frequency has a bimodal characteristic.
- the characteristic of the input impedance of the wireless power transmission device can be reduced as the resonance frequency of the power receiving resonator is increased.
- the value of the input impedance of the wireless power transmission device is set based on the characteristic that the value of the input impedance of the wireless power transmission device decreases as the resonance frequency of the power receiving resonator increases, and the power supplied is adjusted accordingly. be able to.
- the power supply resonator and the power reception resonator include a capacitor, and the power supply resonator and the power reception resonator.
- the resonance frequency of the capacitor is adjusted by changing the capacitance of each capacitor.
- the resonance frequency of the power feeding resonator and the power receiving resonator can be adjusted by changing the capacitance of the capacitor.
- one of the inventions for solving the above-described problems is a wireless power transmission apparatus that is adjusted by the supply power control method described above.
- One of the inventions for solving the above problems is a wireless power transmission device that supplies power by changing a magnetic field from a power supply module including a power supply resonator to a power reception module including a power reception resonator.
- a manufacturing method comprising: When the resonance frequency of the power supply resonator matches the resonance frequency of the power reception resonator, the value of the transmission characteristic with respect to the drive frequency of the power supplied to the power supply module, or the power supply resonator and the power reception resonance Use the value of the coupling coefficient between the power supply and the reference value to define the power transmission efficiency.
- the resonance frequency of at least one of the power feeding resonator and the power receiving resonator within a desired range including the reference value, the power supplied by setting the input impedance value of the wireless power transmission device It includes the process of controlling.
- a wireless power transmission device capable of adjusting the power supplied when wireless power transmission is performed by setting the value of the input impedance of the wireless power transmission device without installing a new device is manufactured. can do. That is, it is possible to manufacture a wireless power transmission device capable of controlling the power to be supplied without increasing the number of parts of the wireless power transmission device.
- a method for manufacturing a transmission apparatus can be provided.
- (A) It is a graph of the transmission characteristic "S21" with respect to the resonant frequency which the electric power feeding resonator which concerns on Example 2 has.
- Embodiments of a wireless power transmission device, a supply power control method, and a method for manufacturing a wireless power transmission device according to the present invention will be described below.
- the wireless power transmission device 1 includes a power supply module 2 including a power supply coil 21 and a power supply resonator 22, and a power reception module 3 including a power reception coil 31 and a power reception resonator 32.
- the power supply coil 21 of the power supply module 2 is connected to the AC power supply 6 including an oscillation circuit in which the drive frequency of the power supplied to the power supply module 2 is set to a predetermined value, and the power reception coil 31 of the power reception module 3 receives power.
- a rechargeable battery 9 is connected via a stabilization circuit 7 that rectifies the AC power that has been generated and a charging circuit 8 that prevents overcharging.
- the stable circuit 7, the charging circuit 8, and the rechargeable battery 9 that are power supply destinations correspond to the power-supplied device 10.
- the feeding coil 21 serves to supply power obtained from the AC power source 6 to the feeding resonator 22 by electromagnetic induction.
- the feeding coil 21 constitutes an RLC circuit including a resistor R 1 , a coil L 1 , and a capacitor C 1 as elements.
- the coil L 1 portion uses a copper wire (with an insulating coating) and the coil diameter is set to 15 mm ⁇ .
- the total impedance of the circuit elements constituting the feeding coil 21 is Z 1, and in this embodiment, the RLC including the resistor R 1 , the coil L 1 , and the capacitor C 1 constituting the feeding coil 21 as elements.
- the total impedance of the circuit (circuit element) is Z 1 .
- the current flowing through the feeding coil 21 is I 1 .
- the current I 1 has the same meaning as the input current I in input to the wireless power transmission device 1.
- the power receiving coil 31 receives the electric power transmitted as magnetic field energy from the power feeding resonator 22 to the power receiving resonator 32 by electromagnetic induction, and plays a role of supplying the power to the rechargeable battery 9 via the stabilization circuit 7 and the charging circuit 8.
- the power receiving coil 31 constitutes an RLC circuit including a resistor R 4 , a coil L 4 , and a capacitor C 4 as shown in FIG.
- the coil L 4 portion is set to a coil diameter of 15 mm ⁇ using a copper wire (with an insulating coating).
- the total impedance of the circuit elements constituting the power receiving coil 31 is Z 4.
- the RLC including the resistor R 4 , the coil L 4 , and the capacitor C 4 constituting the power receiving coil 31 as elements.
- the load impedance of the stable circuit 7, the charging circuit 8, and the rechargeable battery 9 (powered device 10) connected to the power receiving coil 31 is Z L.
- the current flowing through the power receiving coil 31 is I 4 .
- the total impedance of the power-supplied device 10 is Z L , it may be replaced with R L for convenience.
- the power feeding resonator 22 constitutes an RLC circuit including a resistor R 2 , a coil L 2 , and a capacitor C 2 as elements.
- the power receiving resonator 32 constitutes an RLC circuit including a resistor R 3 , a coil L 3 , and a capacitor C 3 as elements.
- Each of the power feeding resonator 22 and the power receiving resonator 32 becomes a resonance circuit and plays a role of creating a magnetic field resonance state.
- the magnetic field resonance state means that two or more coils resonate.
- the total impedance of the circuit elements constituting the feed resonator 22 is Z 2.
- the resistor R 2 , the coil L 2 , and the capacitor C 2 constituting the feed resonator 22 are elements.
- Z 2 be the total impedance of the RLC circuit (circuit element).
- the total impedance of the circuit elements constituting the power receiving resonator 32 is Z 3.
- the resistor R 3 , the coil L 3 , and the capacitor C 3 constituting the power receiving resonator 32 are elements.
- Z 3 be the total impedance of the RLC circuit (circuit element).
- the current flowing through the power feeding resonator 22 is I 2
- the current flowing through the power receiving resonator 32 is I 3 .
- the power supply resonator 22 uses a solenoid type coil having a coil diameter of 15 mm ⁇ made of a copper wire (with an insulating coating).
- the power receiving resonator 32 uses a solenoid type coil having a coil diameter of 15 mm ⁇ made of a copper wire (with an insulating coating).
- the power feeding resonator 22 and the power receiving resonator 32 may be spiral or solenoid type coils as long as the resonators use coils.
- the distance between the power feeding coil 21 and the power feeding resonator 22 is d12
- the distance between the power feeding resonator 22 and the power receiving resonator 32 is d23
- the distance between the power receiving resonator 32 and the power receiving coil 31 Is d34 (see FIG. 1).
- the coupling coefficient between the coil L 1 and the coil L 2 is denoted as k 12
- the coupling coefficient between the coil L 2 and the coil L 3 is denoted as k 23
- the coil A coupling coefficient between L 3 and the coil L 4 is expressed as k 34 .
- Resistance values, inductances, capacitor capacities, and coupling coefficients k 12 , k 23 , k 34 in R 4 , L 4 , C 4 of the RLC circuit of the receiving coil 31 are parameters that can be changed at the design / manufacturing stage, etc. Is preferably set so as to satisfy a relational expression (formula 3) described later.
- a magnetic field resonance state can be created between the power feeding resonator 22 and the power receiving resonator 32.
- electric power can be transmitted from the power feeding resonator 22 to the power receiving resonator 32 as magnetic field energy.
- FIG. 1 a circuit diagram of the wireless power transmission device 1 (including the stabilization circuit 7, the charging circuit 8, and the rechargeable battery 9) configured as described above is shown in the lower diagram of FIG. This illustrates replace the entire wireless power transmission device 1 to one of the input impedance Z in.
- the voltage V in when it's constant-voltage power supply AC power supply 6 is typically used is kept constant, It can be seen that the value of the current I in needs to be controlled.
- the current I in can be expressed as (Expression 2) when expressed by a relational expression based on the voltage V in and the input impedance Z in . ... (Formula 2)
- the configuration of the wireless power transmission device 1 is represented by an equivalent circuit as shown in FIG. Then, from the equivalent circuit of FIG. 2, the input impedance Z in of the wireless power transmission device 1 can be expressed as (Equation 3). ... (Formula 3)
- the impedances Z 1 , Z 2 , Z 3 , Z 4 , and Z L in the power feeding coil 21, the power feeding resonator 22, the power receiving resonator 32, and the power receiving coil 31 of the wireless power transmission device 1 in the present embodiment are respectively It can be expressed as (Equation 4). ... (Formula 4)
- R 3 , L 3 , C 3 , resistance values, inductances, capacitor capacities, and coupling coefficients k 12 , k 23 , k 34 in R 4 , L 4 , C 4 of the RLC circuit of the receiving coil 31 are designed and manufactured.
- modifiable parameters such as the adjusted value of the input impedance Z in of the wireless power transmission device 1 which is derived from relational expression (equation 5), by changing the value of the current I in, the wireless power transmission apparatus It can be seen that the power supplied from 1 to the power-supplied device 10 can be controlled.
- the wireless power transmission device 1 it is possible to maximize the power transmission efficiency in wireless power transmission by matching the resonance frequency of the power feeding resonator 22 with the resonance frequency of the power receiving resonator 32. It is generally known, and generally, the resonance frequency of the power supply resonator 22 and the resonance frequency of the power reception resonator 32 are matched in order to maximize the power transmission efficiency.
- the power transmission efficiency refers to the ratio of the power received by the power receiving module 3 to the power supplied to the power supply module 2.
- the inductance and capacitor capacity of the RLC circuit (resonance circuit) of the power supply resonator 22 and power reception resonance The inductance and the capacitor capacity of the RLC circuit (resonance circuit) included in the device 32 must be set to predetermined values (see Equation 1). This means that when designing the wireless power transmission device 1, the inductance and the capacitor capacity of the RLC circuit (resonance circuit) included in the power feeding resonator 22 and the power receiving resonator 32 are limited.
- the inductance and the capacitor capacity of the RLC circuit (resonance circuit) included in the power supply resonator 22 and the power reception resonator 32 are parameters that determine power to be supplied to the power-supplied device 10 such as the rechargeable battery 9 that is the power supply destination. It is desirable that the coil inductance and capacitor capacity can be adjusted.
- the RLC included in the power feeding resonator 22 and the power receiving resonator 32 is maintained while maintaining the power transmission efficiency when the resonance frequency of the power feeding resonator 22 is matched with the resonance frequency of the power receiving resonator 32.
- the power supply module 2 in the case where the resonance frequency of the power supply resonator 22 and the resonance frequency of the power reception resonator 32 are matched with each other is provided.
- the value "S21" the transmission characteristics with respect to the driving frequency of the power supplied, or the value of the coupling coefficient k 23 between the feeding resonator 22 and the power-receiving cavity 32, and a reference value defining the power transmission efficiency
- a desired range including the reference value is set, and the resonance frequency of the power feeding resonator 22 and the power receiving resonator 32 can be changed within the desired range including the reference value.
- the inductance of the RLC circuit supplying resonator 22 and the power-receiving cavity 32 is provided (resonant circuit), and to allow adjusting the capacitance. Then, by adjusting the resonance frequency of the power feeding resonator 22 and / or the power receiving resonator 32, the value of the input impedance of the wireless power transmission device 1 is adjusted while maintaining the power transmission efficiency, so Control the power supplied.
- Example 1 In the wireless power transmission device 1 used in Example 1, the values of R 1 , R 2 , R 3 , and R 4 were set to 0.5 ⁇ , 0.5 ⁇ , 0.5 ⁇ , and 0.5 ⁇ , respectively.
- the values of L 1 , L 2 , L 3 , and L 4 were set to 4.5 ⁇ H, 4.5 ⁇ H, 4.5 ⁇ H, and 4.5 ⁇ H, respectively.
- the coupling coefficients k 12 and k 34 were set to 0.189 and 0.189, respectively.
- the resonance frequency in the power feeding resonator 22 was set (fixed) to 1.003 MHz.
- the wireless power transmission device 1 is connected to a network analyzer (E5061B manufactured by Agilent Technologies in this embodiment) and the resonance frequency of the power receiving resonator 32 is changed, the power feeding resonator 22, the coupling coefficient k 23 between the power receiving resonator 32, the transmission characteristic “S 21” (details will be described later) when the wireless power transmission device 1 is set to the bimodal common-mode resonance mode, and the input impedance Z in ,
- the transmission characteristic “S21” (details will be described later) and the input impedance Z in when the wireless power transmission device 1 is set to the bimodal anti-phase resonance mode are measured.
- the transmission characteristic “S21” of the wireless power transmission device 1 with respect to the drive frequency of the power supplied to the wireless power transmission device 1 is measured with a bimodal property.
- the transmission characteristic “S21” represents a signal measured by connecting the wireless power transmission device 1 to a network analyzer, which is displayed in decibels and means that the power transmission efficiency is higher as the numerical value is larger.
- the transmission characteristic “S21” of the wireless power transmission device 1 with respect to the driving frequency of the power supplied to the wireless power transmission device 1 is the strength of the degree of coupling (magnetic field coupling) due to the magnetic field between the power feeding resonator 22 and the power receiving resonator 32. Therefore, it is divided into those having a monomodal property and those having a bimodal property.
- the unimodality means that there is one peak of the transmission characteristic “S21” with respect to the drive frequency, and that peak appears in the resonance frequency band (fo) (see the broken line 51 in FIG. 3).
- bimodality has two peaks of the transmission characteristic “S21” with respect to the drive frequency, and the two peaks are a drive frequency band (fL) lower than the resonance frequency and a drive frequency band (fH) higher than the resonance frequency. ) (See the solid line 52 in FIG. 3). More specifically, bimodality is defined as a state where the reflection characteristic “S11” measured by connecting the wireless power transmission device 1 to the network analyzer has two peaks. Accordingly, even if the peak of the transmission characteristic “S21” with respect to the driving frequency looks at one glance, if the measured reflection characteristic “S11” has two peaks, it has a bimodal property. Shall.
- the transmission characteristic “S21” is maximized when the drive frequency is the resonance frequency f 0 (the power transmission efficiency is maximized), as indicated by a broken line 51 in FIG. To do).
- the transmission characteristic “S21” has a driving frequency band (fL) lower than the resonance frequency fo and the resonance frequency fo. Is also maximized in the high drive frequency band (fH).
- the maximum value of the transmission characteristic “S21” in the bimodality (the value of the transmission characteristic “S21” at fL or fH). Is a value lower than the maximum value of the transmission characteristic “S21” in unimodality (the value of the transmission characteristic “S21” at f0) (see the graph of FIG. 3).
- the power supply resonator 22 and the power reception resonator 32 are set.
- the direction of the current flowing through the power feeding resonator 22 and the direction of the current flowing through the power receiving resonator 32 are the same.
- the transmission characteristic “S21” (broken line 51) in a general wireless power transmission device for the purpose of maximizing the power transmission efficiency
- the value of the transmission characteristic “S21” can be set to a relatively high value.
- a resonance state in which the direction of the current flowing in the coil (power feeding resonator 22) in the power feeding module 2 and the direction of the current flowing in the coil (power receiving resonator 32) in the power receiving module 3 are the same direction is called an in-phase resonance mode. I will decide.
- the magnetic field generated on the outer peripheral side of the power feeding resonator 22 and the magnetic field generated on the outer peripheral side of the power receiving resonator 32 cancel each other, so that the outer peripheral side of the power feeding resonator 22 and the power receiving resonator 32.
- the influence of the magnetic field is reduced, and the magnetic field intensity is smaller than the magnetic field strength other than the outer peripheral side of the power feeding resonator 22 and the power receiving resonator 32 (for example, the magnetic field strength on the inner peripheral side of the power feeding resonator 22 and the power receiving resonator 32).
- a magnetic field space having strength can be formed.
- the drive frequency of the AC power supplied to the power supply module 2 is set to the frequency fH near the peak on the high frequency side in the bimodality (antiphase resonance mode)
- the power supply resonator 22 and the power reception resonator 32 are in antiphase.
- the resonance state occurs, and the direction of the current flowing through the power feeding resonator 22 and the direction of the current flowing through the power receiving resonator 32 are reversed.
- the transmission characteristic “S21” (broken line 51) in a general wireless power transmission device for the purpose of maximizing the power transmission efficiency
- the value of the transmission characteristic “S21” can be set to a relatively high value.
- a resonance state in which the direction of the current flowing in the coil (power feeding resonator 22) in the power feeding module 2 and the direction of the current flowing in the coil (power receiving resonator 32) in the power receiving module 3 are opposite to each other is referred to as an antiphase resonance mode. I will call it.
- the magnetic field generated on the inner peripheral side of the power feeding resonator 22 and the magnetic field generated on the inner peripheral side of the power receiving resonator 32 cancel each other, so that the power feeding resonator 22 and the power receiving resonator 32 are
- the magnetic field strength on the inner peripheral side of the power supply resonator 22 and the power receiving resonator 32 other than the inner peripheral side is reduced (for example, the magnetic field strength on the outer peripheral side of the power supply resonator 22 and the power receiving resonator 32).
- a magnetic field space having a smaller magnetic field strength can be formed.
- the wireless power transmission device 1 itself can be made compact and the design flexibility can be improved.
- R 1 , L 1 , C 1 of the RLC circuit of the feeding coil 21 and the feeding resonator 22 are set so that the transmission characteristic “S 21” of the wireless power transmission device 1 has a bimodal nature.
- the changeable parameters constituting the power supply module 2 and the power reception module 3 such as the capacitor capacity and the coupling coefficients k 12 , k 23 , and k 34 are set.
- the wireless power transmission device 1 is changed to the bimodal in-phase resonance.
- type transmission characteristic "S21" when set to mode impedance Z in, measuring the input impedance Z in the transmission characteristic "S21” was measured with setting the wireless power transmission device 1 in the opposite-phase resonance mode of bimodal.
- the coupling coefficient k 23 is obtained by (Equation 6) when the transmission characteristic “S21” of the wireless power transmission device 1 with respect to the driving frequency of the power supplied to the wireless power transmission device 1 has a bimodal property.
- the coupling coefficient k 23 is an index representing the strength of coupling between the power feeding resonator 22 and the power receiving resonator 32. ... (Formula 6)
- Example 1 the measurement results according to Example 1 are shown in FIG. 5A, the wireless power transmission device 1 in the case where the resonance frequency (horizontal axis) of the power receiving resonator 32 is changed after setting the resonance frequency of the power feeding resonator 22 to 1.003 MHz.
- the transmission characteristic “S21” vertical axis: ⁇
- the wireless power transmission device 1 is set to the bimodal anti-phase resonance mode.
- S21 ”(vertical axis: ⁇ mark) was graphed.
- 5B the wireless power transmission device 1 when the resonance frequency (horizontal axis) of the power receiving resonator 32 is changed after setting the resonance frequency of the power feeding resonator 22 to 1.003 MHz.
- transmission characteristic “S21” is set to the reference value: common-mode resonance mode
- the wireless power transmission device 1 is set to the bimodal common-mode resonance mode.
- the reference value is ⁇ 5.76 dB, which is the value of the transmission characteristic (see S21 (dB) @fL in FIG. 4).
- a desired transmission characteristic range including a reference value of ⁇ 5.76 dB is set (the desired transmission characteristic value is a value that can be freely set according to the specification of the power-supplied device 10). This sets the allowable power transmission efficiency range.
- ⁇ 6.10 dB is set as the lower limit value as a value that causes no problem in power transmission efficiency when power is supplied to the rechargeable battery 9.
- the range of desired transmission characteristics including the reference value is set to ⁇ 6.10 to ⁇ 5.76 dB.
- the item “S21 (dB) @fL” in FIG. ) the item “S21 (dB) @fL” in FIG. ) ”.
- the variable range of the resonance frequency of the power receiving resonator 32 is determined in the range of 0.978 to 1.076 MHz.
- the inductance and capacitor capacity of the RLC circuit (resonance circuit) included in the power receiving resonator 32 can be adjusted within a range where the resonance frequency of the power receiving resonator 32 falls within the range of 0.978 to 1.076 MHz. It can be.
- the resonance frequency of the power reception resonator 32 is increased. 4
- ( ⁇ ) @fL” in FIG. 4 and the mark “ ⁇ ” in FIG. 5B indicate that the value of the input impedance Z in of the wireless power transmission device 1 increases. I understand that there is.
- the power receiving resonance in the range of 0.978 to 1.076 MHz is based on the characteristic that the value of the input impedance Z in of the wireless power transmission device 1 increases.
- the resonant frequency of the vessel 32 has, by adjusting the value of the input impedance Z in of the wireless power transmission apparatus 1, by changing the value of the current I in, power from the wireless power transmission device 1 to the power supply device 10 It can be seen that the generated power can be controlled.
- the resonance frequency of the power receiving resonator 32 is set to 1.076 MHz
- the value of the input impedance Z in of the wireless power transmission device 1 is larger than the value of the current I in .
- the power supplied from the wireless power transmission device 1 to the power-supplied device 10 can be reduced.
- the transmission characteristic “S21” is set to the reference value: reversed-phase resonance mode
- the wireless power transmission device 1 is set to the bimodal anti-phase resonance mode when the resonance frequency of the power supply resonator 22 and the resonance frequency of the power reception resonator 32 are matched at 1.003 MHz.
- the reference value is ⁇ 8.99 dB, which is the value of the transmission characteristic (see S21 (dB) @fH in FIG. 4).
- a desired transmission characteristic range including a reference value of ⁇ 8.99 dB is set (this desired transmission characteristic value is a value that can be freely set according to the specification of the power-supplied device 10).
- ⁇ 9.42 dB is set as the lower limit value as a value that causes no problem in power transmission efficiency when power is supplied to the rechargeable battery 9. Therefore, the range of desired transmission characteristics including the reference value is set to ⁇ 9.42 to ⁇ 8.99 dB.
- the desired transmission characteristic range including the reference value is set to ⁇ 9.42 to ⁇ 8.99 dB, the item “S21 (dB) @fH” in FIG.
- the variable range of the resonance frequency of the power receiving resonator 32 is determined in the range of 0.978 to 1.034 MHz.
- the inductance and capacitor capacity of the RLC circuit (resonance circuit) included in the power receiving resonator 32 can be adjusted within a range where the resonance frequency of the power receiving resonator 32 falls within the range of 0.978 to 1.034 MHz. It can be.
- the wireless power transmission device 1 is set to the bimodal anti-phase resonance mode, the resonance frequency of the power supply resonator 22 is fixed to 1.003 MHz, and the resonance frequency of the power reception resonator 32 is increased. Then, as indicated by the item “
- the power receiving resonance in the range of 0.978 to 1.034 MHz is based on the characteristic that the value of the input impedance Z in of the wireless power transmission device 1 decreases.
- the value of current I in The power supplied from the wireless power transmission apparatus 1 to the power-supplied device 10 can be increased.
- the coupling coefficient k 23 (between the feeding resonator 22 and the power receiving resonator 32 when the resonance frequency of the power feeding resonator 22 and the resonance frequency of the power receiving resonator 32 are matched at 1.003 MHz.
- the 0.189 is the value of the coupling reference coefficient k 23) in FIG. 4 as a reference value.
- a range of a desired coupling coefficient k 23 including a reference value of 0.189 is set (the value of the desired coupling coefficient k 23 is a value that can be freely set according to the specifications of the power-supplied device 10 and the like. ).
- the range of the desired coupling coefficient k 23 including the reference value is set to 0.187 to 0.194
- the variable range of the resonance frequency of the power receiving resonator 32 is determined in the range of 0.957 to 1.034 MHz.
- the inductance and capacitor capacity of the RLC circuit (resonance circuit) included in the power receiving resonator 32 can be adjusted within a range where the resonance frequency of the power receiving resonator 32 falls within the range of 0.957 to 1.034 MHz. It can be.
- the resonance frequency of the power feeding resonator 22 is fixed to 1.003 MHz, and the resonance frequency of the power receiving resonator 32 is increased, FIG.
- ( ⁇ ) @fL” and the ⁇ mark in FIG. 5B it can be seen that there is a characteristic that the value of the input impedance Z in of the wireless power transmission device 1 increases. .
- the power receiving resonance in the range of 0.957 to 1.034 MHz is based on the characteristic that the value of the input impedance Z in of the wireless power transmission device 1 increases.
- the value of current I in The power supplied from the wireless power transmission device 1 to the power-supplied device 10 can be reduced.
- FIG. 1 There is a characteristic that the value of the input impedance Z in of the wireless power transmission device 1 becomes small as shown in the item “
- the resonance frequency receiving resonator 32 has, as described above increases, based on the characteristic value of the input impedance Z in of the wireless power transmission device 1 is reduced, the power receiving resonance in a range of 0.957 ⁇ 1.034MHz by adjusting the resonant frequency of the vessel 32 has, by adjusting the value of the input impedance Z in of the wireless power transmission apparatus 1, by changing the value of the current I in, power from the wireless power transmission device 1 to the power supply device 10 It can be seen that the generated power can be controlled.
- the value of current I in The power supplied from the wireless power transmission apparatus 1 to the power-supplied device 10 can be increased.
- the reference value that defines the efficiency is used, which is used as the reference value can be freely selected at the design stage of the wireless power transmission device 1.
- the wireless power transmission device 1 used in the second embodiment is the same as that used in the first embodiment.
- the resonance frequency in the power receiving resonator 32 is set (fixed) to 1.003 MHz.
- the coupling coefficient between the power feeding resonator 22 and the power receiving resonator 32 when the wireless power transmission device 1 is connected to the network analyzer and the resonance frequency of the power feeding resonator 22 is changed.
- k 23 when the wireless power transmission device 1 is set to the bimodal common-phase resonance mode, the transmission characteristic “S21” and the input impedance Z in , and when the wireless power transmission device 1 is set to the bimodal anti-phase resonance mode The transmission characteristic “S21” and the input impedance Z in are measured.
- FIG. 7A shows the wireless power when the resonance frequency (horizontal axis) of the power supply resonator 22 is changed after setting (fixing) the resonance frequency of the power reception resonator 32 to 1.003 MHz.
- Transmission characteristic “S21” vertical axis: ⁇
- the transmission characteristic “S21” vertical axis: ⁇ mark) was graphed.
- 7B the wireless power transmission device 1 when the resonance frequency (horizontal axis) of the power feeding resonator 22 is changed after setting the resonance frequency of the power receiving resonator 32 to 1.003 MHz.
- transmission characteristic “S21” is set to the reference value: common-mode resonance mode
- transmission characteristics when the wireless power transmission device 1 is set to a bimodal common-mode resonance mode when the resonance frequency of the power supply resonator 22 and the resonance frequency of the power reception resonator 32 are matched at 1.003 MHz.
- the reference value is ⁇ 5.93 dB, which is the value of S21 (dB) @fL in FIG. 6 and 7A, when the resonance frequency of the power supply resonator 22 and the resonance frequency of the power reception resonator 32 are matched at 1.003 MHz, the value of the transmission characteristic becomes the highest.
- a desired transmission characteristic range including a reference value of ⁇ 5.93 dB is set (the desired transmission characteristic value is a value that can be freely set according to the specification of the power-supplied device 10).
- the desired transmission characteristic value is a value that can be freely set according to the specification of the power-supplied device 10).
- ⁇ 6.34 dB is set as the lower limit value as a value that does not cause a problem in power transmission efficiency when power is supplied to the rechargeable battery 9. Therefore, the range of desired transmission characteristics including the reference value is set to ⁇ 6.34 to ⁇ 5.93 dB.
- the range of desired transmission characteristics including the reference value is set to ⁇ 6.34 to ⁇ 5.93 dB, the item “S21 (dB) @fL” in FIG.
- the variable range of the resonance frequency of the power supply resonator 22 is determined to be in the range of 0.957 to 1.056 MHz.
- the inductance and capacitor capacity of the RLC circuit (resonance circuit) included in the power supply resonator 22 can be adjusted within a range where the resonance frequency of the power supply resonator 22 falls within the range of 0.957 to 1.056 MHz. It can be.
- the resonance frequency of the power receiving resonator 32 is fixed to 1.003 MHz, and the resonance frequency of the power feeding resonator 22 is increased. 6, and the item “
- the resonance frequency supplying resonator 22 increases, based on the value decreases characteristic of the input impedance Z in of the wireless power transmission apparatus 1, the feed resonance in a range of 0.957 ⁇ 1.056MHz
- the resonance frequency of the power supply 22 By adjusting the resonance frequency of the power supply 22, the value of the input impedance Z in of the wireless power transmission device 1 is adjusted, the value of the current I in is changed, and power is supplied from the wireless power transmission device 1 to the power-supplied device 10. It can be seen that the generated power can be controlled.
- the value of current I in The power supplied from the wireless power transmission apparatus 1 to the power-supplied device 10 can be increased.
- the transmission characteristic “S21” is set to the reference value: reversed-phase resonance mode
- the wireless power transmission device 1 is set to the bimodal anti-phase resonance mode when the resonance frequency of the power supply resonator 22 and the resonance frequency of the power reception resonator 32 are matched at 1.003 MHz.
- the reference value is ⁇ 9.46 dB, which is the value of the transmission characteristic (see S21 (dB) @fH in FIG. 6).
- a desired transmission characteristic range including a reference value of ⁇ 9.46 dB is set (this desired transmission characteristic value is a value that can be freely set according to the specification of the power-supplied device 10).
- ⁇ 9.76 dB is set as the lower limit value as a value that causes no problem in power transmission efficiency when power is supplied to the rechargeable battery 9. Therefore, the range of desired transmission characteristics including the reference value is set to ⁇ 9.76 to ⁇ 9.46 dB.
- the desired transmission characteristic range including the reference value is set to ⁇ 9.76 to ⁇ 9.46 dB, the item “S21 (dB) @fH” in FIG.
- the variable range of the resonance frequency of the power supply resonator 22 is determined to be in the range of 0.978 to 1.056 MHz.
- the inductance and capacitor capacity of the RLC circuit (resonance circuit) included in the power supply resonator 22 can be adjusted within a range in which the resonance frequency of the power supply resonator 22 falls within the range of 0.978 to 1.056 MHz. It can be.
- the wireless power transmission device 1 is set to the bimodal anti-phase resonance mode, the resonance frequency of the power receiving resonator 32 is fixed to 1.003 MHz, and the resonance frequency of the power supply resonator 22 is increased. Then, as indicated by the item “
- the resonance frequency supplying resonator 22 increases, based on the characteristic value increases the input impedance Z in of the wireless power transmission apparatus 1, the feed resonance in a range of 0.978 ⁇ 1.056MHz
- the resonance frequency of the power supply 22 the value of the input impedance Z in of the wireless power transmission device 1 is adjusted, the value of the current I in is changed, and power is supplied from the wireless power transmission device 1 to the power-supplied device 10. It can be seen that the generated power can be controlled.
- the value of current I in The power supplied from the wireless power transmission device 1 to the power-supplied device 10 can be reduced.
- the coupling coefficient k 23 (If the coupling coefficient k 23 is set to the reference value)
- the coupling coefficient k 23 (between the feeding resonator 22 and the power receiving resonator 32 when the resonance frequency of the power feeding resonator 22 and the resonance frequency of the power receiving resonator 32 are matched at 1.003 MHz.
- the 0.188 is the value of the coupling reference coefficient k 23) in FIG. 6 as the reference value.
- a range of a desired coupling coefficient k 23 including a reference value of 0.188 is set (the desired coupling coefficient k 23 is a value that can be freely set according to the specifications of the power-supplied device 10 and the like. ).
- the range of the desired coupling coefficient k 23 including the reference value is set to 0.187 to 0.194
- the variable range of the resonance frequency of the feeding resonator 22 is determined to be in the range of 0.957 to 1.056 MHz.
- the inductance and capacitor capacity of the RLC circuit (resonance circuit) included in the power supply resonator 22 can be adjusted within a range where the resonance frequency of the power supply resonator 22 falls within the range of 0.957 to 1.056 MHz. It can be.
- the resonance frequency of the power receiving resonator 32 is fixed to 1.003 MHz, and the resonance frequency of the power feeding resonator 22 is increased, FIG.
- ( ⁇ ) @fL” and the ⁇ mark in FIG. 7B it can be seen that there is a characteristic that the value of the input impedance Z in of the wireless power transmission device 1 is small. .
- the resonance frequency supplying resonator 22 increases, based on the value decreases characteristic of the input impedance Z in of the wireless power transmission apparatus 1, the feed resonance in a range of 0.957 ⁇ 1.056MHz
- the resonance frequency of the power supply 22 By adjusting the resonance frequency of the power supply 22, the value of the input impedance Z in of the wireless power transmission device 1 is adjusted, the value of the current I in is changed, and power is supplied from the wireless power transmission device 1 to the power-supplied device 10. It can be seen that the generated power can be controlled.
- the value of current I in The power supplied from the wireless power transmission apparatus 1 to the power-supplied device 10 can be increased.
- FIG. 1 There is a characteristic that the value of the input impedance Z in of the wireless power transmission device 1 becomes large as shown in the item “
- the resonance frequency supplying resonator 22 increases, based on the characteristic value increases the input impedance Z in of the wireless power transmission apparatus 1, the feed resonance in a range of 0.957 ⁇ 1.056MHz
- the resonance frequency of the power supply 22 the value of the input impedance Z in of the wireless power transmission device 1 is adjusted, the value of the current I in is changed, and power is supplied from the wireless power transmission device 1 to the power-supplied device 10. It can be seen that the generated power can be controlled.
- the value of current I in The power supplied from the wireless power transmission device 1 to the power-supplied device 10 can be reduced.
- the value of the input impedance Z in of the wireless power transmission device 1 is set by changing the resonance frequency of at least one of the power feeding resonator 22 and the power receiving resonator 32.
- the power to be supplied can be adjusted.
- the resonance frequency of the power supply resonator 22 and the resonance frequency of the power reception resonator 32 are matched, the value of the transmission characteristic with respect to the drive frequency of the power supplied to the power supply module 2;
- the value of the coupling coefficient k 23 between the power feeding resonator 22 and the power receiving resonator 32 is used as a reference value that defines the power transmission efficiency, and a desired range including the reference value is set using this reference value as a guide.
- the resonance frequency of at least one of the power feeding resonator 22 and the power receiving resonator 32 can be changed within a desired range including the reference value.
- the power supplied by setting the value of the input impedance Z in of the wireless power transmission device 1 while maintaining the power transmission efficiency. can be adjusted.
- wireless power is supplied from the power supply module 2 including the power supply coil 21 and the power supply resonator 22 to the power reception module 3 including the power reception resonator 32 and the power reception coil 31 by a resonance phenomenon.
- the value of the transmission characteristic with respect to the driving frequency of the power supplied to the power supply module 2 is used as a reference value that defines the power transmission efficiency, and a desired range including the reference value is set using this reference value as a guide.
- the resonance frequency of at least one of the power feeding resonator 22 and the power receiving resonator 32 can be changed within a desired range including the reference value. Then, by changing the resonance frequency of at least one of the power feeding resonator 22 and the power receiving resonator 32, the power supplied by setting the value of the input impedance Z in of the wireless power transmission device 1 while maintaining the power transmission efficiency. Can be adjusted.
- the resonance frequencies of the power feeding resonator 22 and the power receiving resonator 32 can be adjusted by changing the capacitance of the capacitors included in each.
- the resonance frequencies of the power feeding resonator 22 and the power receiving resonator 32 can be adjusted by changing the inductance of the coils included in each of them.
- a design method which is one process for manufacturing the wireless power transmission device 1, will be described with reference to FIGS.
- a wireless headset 200 including an earphone speaker unit 200a and a charger 201 will be described as examples of portable devices on which the wireless power transmission device 1 is mounted (see FIG. 8).
- the wireless power transmission device 1 designed by this design method includes a power receiving module 3 (a power receiving coil 31 and a power receiving resonator 32) and a power feeding module 2 (a power feeding coil), respectively, in the wireless headset 200 and the charger 201 shown in FIG. 21 is mounted as a feeding resonator 22).
- the stabilization circuit 7, the charging circuit 8, and the rechargeable battery 9 are shown outside the power receiving module 3, but actually, the solenoid-shaped power receiving coil 31 and the coil of the power receiving resonator 32 are used. It is arranged on the inner circumference side. That is, the wireless headset 200 includes the power receiving module 3, the stabilization circuit 7, the charging circuit 8, and the rechargeable battery 9, and the charger 201 includes the power supply module 2.
- the power supply coil 21 is used with the AC power supply 6 connected thereto.
- the amount of power received by the power receiving module 3 is determined from the capacity of the rechargeable battery 9 and the charging current required for charging the rechargeable battery 9 (S1).
- the distance between the power supply module 2 and the power reception module 3 is determined (S2).
- the distance d23 between the power feeding resonator 22 and the power receiving resonator 32 is determined in consideration of the shapes and structures of the wireless headset 200 and the charger 201.
- the coil diameters of the power receiving coil 31 and the power receiving resonator 32 in the power receiving module 3 are determined (S3).
- the coil diameters of the power feeding coil 21 and the power feeding resonator 22 in the power feeding module 2 are determined (S4).
- the minimum necessary amount of power supplied to the power supply module 2 is determined ( S5).
- the design value of the input impedance Zin in the wireless power transmission device 1 is based on the received power amount received by the power receiving module 3, the power transmission efficiency, and the minimum necessary power supply amount to be fed to the power feeding module 2. Determined (S6).
- the resonance frequency and the like in the resonator 22 and the power receiving resonator 32 are determined (S7).
- the resonance frequencies of the power feeding resonator 22 and the power receiving resonator 32 are determined according to the procedure described in the first and second embodiments, and the inductance of the RLC circuit (resonance circuit) included in the power feeding resonator 22 and the power receiving resonator 32, and / Or adjusted and determined by the capacitance of the capacitor.
- the method of manufacturing the wireless power transmission apparatus 1 including the above design method, and, according to the wireless power transmission device 1 manufactured through the above design process, by setting the value of the input impedance Z in of the wireless power transmission device 1
- the wireless power transmission apparatus 1 capable of controlling the power to be supplied without increasing the number of components of the wireless power transmission device 1 can be manufactured.
- the wireless headset 200 has been described as an example. However, as long as the device includes a rechargeable battery, a tablet PC, a digital camera, a mobile phone, an earphone music player, a hearing aid, and a sound collector Can also be used.
- the wireless power transmission device 1 that performs power transmission by coupling a magnetic field using a resonance phenomenon (magnetic field resonance state) between resonators (coils) included in the power supply module 2 and the power reception module 3 is illustrated.
- the present invention can also be applied to a wireless power transmission device that performs power transmission using resonance and electromagnetic induction between coils included in the power feeding device and the power receiving device.
- the wireless power transmission device 1 is mounted on a portable electronic device.
- the usage is not limited to these small devices, and the specification is changed according to the required power amount.
- it can be mounted on a wireless charging system in a relatively large electric vehicle (EV), a smaller medical wireless gastrocamera, or the like.
- EV electric vehicle
- a smaller medical wireless gastrocamera or the like.
Abstract
Description
前記給電共振器及び前記受電共振器の少なくとも一方が有する共振周波数を調整することにより、当該無線電力伝送装置の入力インピーダンスの値を設定して前記供給する電力を制御することを特徴としている。
前記給電共振器が有する共振周波数及び前記受電共振器が有する共振周波数を一致させた場合における、前記給電モジュールに供給する電力の駆動周波数に対する伝送特性の値、又は、前記給電共振器と前記受電共振器との間の結合係数の値を、電力伝送効率を規定する基準値とし、
当該基準値を含む所望の範囲で、前記給電共振器及び前記受電共振器の少なくとも一方が有する共振周波数を調整することにより、当該無線電力伝送装置の入力インピーダンスの値を設定して前記供給する電力を制御することを特徴としている。
前記給電共振器が有する共振周波数は、前記給電共振器が有する共振周波数が大きくなるにつれて、当該無線電力伝送装置の入力インピーダンスの値が小さくなる特性に基づき調整されることを特徴としている。
これにより、給電共振器が有する共振周波数が大きくなるにつれて、無線電力伝送装置の入力インピーダンスの値が小さくなる特性に基づき無線電力伝送装置の入力インピーダンスの値を設定し、もって供給する電力を調整することができる。
前記受電共振器が有する共振周波数は、前記受電共振器が有する共振周波数が大きくなるにつれて、当該無線電力伝送装置の入力インピーダンスの値が大きくなる特性に基づき調整されることを特徴としている。
これにより、受電共振器が有する共振周波数が大きくなるにつれて、無線電力伝送装置の入力インピーダンスの値が小さくなる特性に基づき無線電力伝送装置の入力インピーダンスの値を設定し、もって供給する電力を調整することができる。
前記給電共振器が有する共振周波数は、前記給電共振器が有する共振周波数が大きくなるにつれて、当該無線電力伝送装置の入力インピーダンスの値が大きくなる特性に基づき調整されることを特徴としている。
これにより、給電共振器が有する共振周波数が大きくなるにつれて、無線電力伝送装置の入力インピーダンスの値が大きくなる特性に基づき無線電力伝送装置の入力インピーダンスの値を設定し、もって供給する電力を調整することができる。
前記受電共振器が有する共振周波数は、前記受電共振器が有する共振周波数が大きくなるにつれて、当該無線電力伝送装置の入力インピーダンスの値が小さくなる特性に基づき調整されることを特徴としている。
これにより、受電共振器が有する共振周波数が大きくなるにつれて、無線電力伝送装置の入力インピーダンスの値が小さくなる特性に基づき無線電力伝送装置の入力インピーダンスの値を設定し、もって供給する電力を調整することができる。
前記給電共振器が有する共振周波数及び前記受電共振器が有する共振周波数を一致させた場合における、前記給電モジュールに供給する電力の駆動周波数に対する伝送特性の値、又は、前記給電共振器と前記受電共振器との間の結合係数の値を、電力伝送効率を規定する基準値とし、
当該基準値を含む所望の範囲で、前記給電共振器及び前記受電共振器の少なくとも一方が有する共振周波数を調整することにより、当該無線電力伝送装置の入力インピーダンスの値を設定して前記供給する電力を制御する工程を含むことを特徴としている。
まず、無線電力伝送装置の供給電力制御方法、及び、無線電力伝送装置の製造方法を説明する前に、供給電力制御方法又は製造方法によって設計・製造される無線電力伝送装置1について説明する。
無線電力伝送装置1は、図1に示すように、給電コイル21及び給電共振器22を備える給電モジュール2と、受電コイル31及び受電共振器32を備える受電モジュール3とを備えている。そして、給電モジュール2の給電コイル21に、給電モジュール2に供給する電力の駆動周波数を所定の値に設定した発振回路を備えた交流電源6を接続し、受電モジュール3の受電コイル31に、受電された交流電力を整流化する安定回路7及び過充電を防止する充電回路8を介して充電池9を接続している。なお、電力の給電先となる安定回路7、充電回路8、及び、充電池9は、被給電機器10に相当する。
上記無線電力伝送装置1の構成を踏まえて、無線電力伝送装置1が供給する電力を調整する供給電力制御方法について説明する。
・・・(式3)
・・・(式4)
本実施形態では、給電共振器22が有する共振周波数と、受電共振器32が有する共振周波数とを一致させた場合の電力伝送効率を維持しつつ、給電共振器22及び受電共振器32が備えるRLC回路(共振回路)のインダクタンス、及び、コンデンサ容量を調整可能とするために、給電共振器22が有する共振周波数と、受電共振器32が有する共振周波数とを一致させた場合における、給電モジュール2に供給する電力の駆動周波数に対する伝送特性の値『S21』、又は、給電共振器22と受電共振器32との間の結合係数k23の値を、電力伝送効率を規定する基準値とし、更に、当該基準値を含む所望の範囲を設定し、当該基準値を含む所望の範囲内で、給電共振器22及び受電共振器32が有する共振周波数を変更可能とすることにより、給電共振器22及び受電共振器32が備えるRLC回路(共振回路)のインダクタンス、及び、コンデンサ容量を調整可能にする。そして、給電共振器22及び/又は受電共振器32が有する共振周波数を調整することにより、電力伝送効率を維持しつつ、無線電力伝送装置1の入力インピーダンスの値を調整して被給電機器10に供給する電力を制御する。
実施例1で使用する無線電力伝送装置1は、R1、R2、R3、R4の値をそれぞれ、0.5Ω、0.5Ω、0.5Ω、0.5Ωに設定した。また、L1、L2、L3、L4の値をそれぞれ、4.5μH、4.5μH、4.5μH、4.5μHに設定した。また、結合係数k12、k34をそれぞれ、0.189、0.189に設定した。また、給電共振器22における共振周波数を1.003MHzに設定(固定)した。そして、上記無線電力伝送装置1をネットワークアナライザ(本実施形態では、アジレント・テクノロジー株式会社製のE5061Bを使用)に接続して、受電共振器32が有する共振周波数を変えた場合における、給電共振器22と受電共振器32との間の結合係数k23、無線電力伝送装置1を双峰性の同相共振モードに設定したときの伝送特性『S21』(詳細は後述する)と入力インピーダンスZin、無線電力伝送装置1を双峰性の逆相共振モードに設定したときの伝送特性『S21』(詳細は後述する)と入力インピーダンスZinを測定する。
・・・(式6)
まず、伝送特性『S21』を基準値に設定し、同相共振モードにした場合について説明する。まず、給電共振器22が有する共振周波数、及び、受電共振器32が有する共振周波数を1.003MHzで一致させた場合における、無線電力伝送装置1を双峰性の同相共振モードに設定したときの伝送特性(図4のS21(dB)@fL参照)の値である-5.76dBを基準値とする。なお、図4及び図5(A)から、給電共振器22が有する共振周波数、及び、受電共振器32が有する共振周波数を1.003MHzで一致させた場合に、伝送特性の値が最も高くなり、電力伝送効率が最も良くなることが分かる。
次に、-5.76dBの基準値を含む所望の伝送特性の範囲を設定する(この所望の伝送特性の値は、被給電機器10の仕様等により自由に設定可能な値である)。これは、許容する電力伝送効率の範囲を設定することになる。本実施形態では、充電池9に給電する際の電力伝送効率に問題ない値として、-6.10dBを下限値とする。よって、基準値を含む所望の伝送特性の範囲は、-6.10~-5.76dBに設定される。
そして、基準値を含む所望の伝送特性の範囲が、-6.10~-5.76dBに設定されると、図4の「S21(dB)@fL」の項目と、「受電共振器(MHz)」の項目を参照して、受電共振器32の共振周波数の可変範囲は、0.978~1.076MHzの範囲に決定されることになる。これにより、受電共振器32が有する共振周波数が、0.978~1.076MHzの範囲内に納まる範囲で、受電共振器32が備えるRLC回路(共振回路)のインダクタンス、及び、コンデンサ容量を調整可能とすることができる。
次に、伝送特性『S21』を基準値に設定し、逆相共振モードにした場合について説明する。まず、給電共振器22が有する共振周波数、及び、受電共振器32が有する共振周波数を1.003MHzで一致させた場合における、無線電力伝送装置1を双峰性の逆相共振モードに設定したときの伝送特性(図4のS21(dB)@fH参照)の値である-8.99dBを基準値とする。
次に、-8.99dBの基準値を含む所望の伝送特性の範囲を設定する(この所望の伝送特性の値は、被給電機器10の仕様等により自由に設定可能な値である)。これは、許容する電力伝送効率の範囲を設定することになる。本実施形態では、例えば、充電池9に給電する際の電力伝送効率に問題ない値として、-9.42dBを下限値とする。よって、基準値を含む所望の伝送特性の範囲は、-9.42~-8.99dBに設定される。
そして、基準値を含む所望の伝送特性の範囲が、-9.42~-8.99dBに設定されると、図4の「S21(dB)@fH」の項目と、「受電共振器(MHz)」の項目を参照して、受電共振器32の共振周波数の可変範囲は、0.978~1.034MHzの範囲に決定されることになる。これにより、受電共振器32が有する共振周波数が、0.978~1.034MHzの範囲内に納まる範囲で、受電共振器32が備えるRLC回路(共振回路)のインダクタンス、及び、コンデンサ容量を調整可能とすることができる。
次に、結合係数k23を基準値に設定した場合について説明する。まず、給電共振器22が有する共振周波数、及び、受電共振器32が有する共振周波数を1.003MHzで一致させた場合における、給電共振器22と受電共振器32との間の結合係数k23(図4の結合係数k23参照)の値である0.189を基準値とする。
次に、0.189の基準値を含む所望の結合係数k23の範囲を設定する(この所望の結合係数k23の値は、被給電機器10の仕様等により自由に設定可能な値である)。これは、許容する電力伝送効率の範囲を設定することになる。本実施形態では、充電池9に給電する際の電力伝送効率に問題ない値として、基準値を含む所望の結合係数k23の範囲を、0.187を下限値とし、0.194を上限値とする。
そして、基準値を含む所望の結合係数k23の範囲が、0.187~0.194に設定されると、図4の「結合係数k23」の項目と、「受電共振器(MHz)」の項目を参照して、受電共振器32の共振周波数の可変範囲は、0.957~1.034MHzの範囲に決定されることになる。これにより、受電共振器32が有する共振周波数が、0.957~1.034MHzの範囲内に納まる範囲で、受電共振器32が備えるRLC回路(共振回路)のインダクタンス、及び、コンデンサ容量を調整可能とすることができる。
本実施例2で使用する無線電力伝送装置1は、実施例1で使用したものと同じである。本実施例2では、受電共振器32における共振周波数を1.003MHzに設定(固定)した。そして、実施例1同様に、無線電力伝送装置1をネットワークアナライザに接続して、給電共振器22が有する共振周波数を変えた場合における、給電共振器22と受電共振器32との間の結合係数k23、無線電力伝送装置1を双峰性の同相共振モードに設定したときの伝送特性『S21』と入力インピーダンスZin、無線電力伝送装置1を双峰性の逆相共振モードに設定したときの伝送特性『S21』と入力インピーダンスZinを測定する。
まず、伝送特性『S21』を基準値に設定し、同相共振モードにした場合について説明する。給電共振器22が有する共振周波数、及び、受電共振器32が有する共振周波数を1.003MHzで一致させた場合における、無線電力伝送装置1を双峰性の同相共振モードに設定したときの伝送特性(図6のS21(dB)@fL参照)の値である-5.93dBを基準値とする。なお、図6及び図7(A)から、給電共振器22が有する共振周波数、及び、受電共振器32が有する共振周波数を1.003MHzで一致させた場合に、伝送特性の値が最も高くなり、電力伝送効率が最も良くなることが分かる。
次に、-5.93dBの基準値を含む所望の伝送特性の範囲を設定する(この所望の伝送特性の値は、被給電機器10の仕様等により自由に設定可能な値である)。これは、許容する電力伝送効率の範囲を設定することになる。本実施形態では、充電池9に給電する際の電力伝送効率に問題ない値として、-6.34dBを下限値とする。よって、基準値を含む所望の伝送特性の範囲は、-6.34~-5.93dBに設定される。
そして、基準値を含む所望の伝送特性の範囲が、-6.34~-5.93dBに設定されると、図6の「S21(dB)@fL」の項目と、「給電共振器(MHz)」の項目を参照して、給電共振器22の共振周波数の可変範囲は、0.957~1.056MHzの範囲に決定されることになる。これにより、給電共振器22が有する共振周波数が、0.957~1.056MHzの範囲内に納まる範囲で、給電共振器22が備えるRLC回路(共振回路)のインダクタンス、及び、コンデンサ容量を調整可能とすることができる。
次に、伝送特性『S21』を基準値に設定し、逆相共振モードにした場合について説明する。まず、給電共振器22が有する共振周波数、及び、受電共振器32が有する共振周波数を1.003MHzで一致させた場合における、無線電力伝送装置1を双峰性の逆相共振モードに設定したときの伝送特性(図6のS21(dB)@fH参照)の値である-9.46dBを基準値とする。
次に、-9.46dBの基準値を含む所望の伝送特性の範囲を設定する(この所望の伝送特性の値は、被給電機器10の仕様等により自由に設定可能な値である)。これは、許容する電力伝送効率の範囲を設定することになる。本実施形態では、例えば、充電池9に給電する際の電力伝送効率に問題ない値として、-9.76dBを下限値とする。よって、基準値を含む所望の伝送特性の範囲は、-9.76~-9.46dBに設定される。
そして、基準値を含む所望の伝送特性の範囲が、-9.76~-9.46dBに設定されると、図6の「S21(dB)@fH」の項目と、「給電共振器(MHz)」の項目を参照して、給電共振器22の共振周波数の可変範囲は、0.978~1.056MHzの範囲に決定されることになる。これにより、給電共振器22が有する共振周波数が、0.978~1.056MHzの範囲内に納まる範囲で、給電共振器22が備えるRLC回路(共振回路)のインダクタンス、及び、コンデンサ容量を調整可能とすることができる。
次に、結合係数k23を基準値に設定した場合について説明する。まず、給電共振器22が有する共振周波数、及び、受電共振器32が有する共振周波数を1.003MHzで一致させた場合における、給電共振器22と受電共振器32との間の結合係数k23(図6の結合係数k23参照)の値である0.188を基準値とする。
次に、0.188の基準値を含む所望の結合係数k23の範囲を設定する(この所望の結合係数k23の値は、被給電機器10の仕様等により自由に設定可能な値である)。これは、許容する電力伝送効率の範囲を設定することになる。本実施形態では、充電池9に給電する際の電力伝送効率に問題ない値として、基準値を含む所望の結合係数k23の範囲を、0.187を下限値とし、0.194を上限値とする。
そして、基準値を含む所望の結合係数k23の範囲が、0.187~0.194に設定されると、図6の「結合係数k23」の項目と、「給電共振器(MHz)」の項目を参照して、給電共振器22の共振周波数の可変範囲は、0.957~1.056MHzの範囲に決定されることになる。これにより、給電共振器22が有する共振周波数が、0.957~1.056MHzの範囲内に納まる範囲で、給電共振器22が備えるRLC回路(共振回路)のインダクタンス、及び、コンデンサ容量を調整可能とすることができる。
なお、給電共振器22及び受電共振器32が有する共振周波数は、それぞれが備えるコイルのインダクタンスを変えることにより調整することも可能である。
次に、無線電力伝送装置1を製造する一工程である、設計方法(設計工程)について、図8及び図9を参照して説明する。本説明では、無線電力伝送装置1を搭載する携帯機器としてイヤホンスピーカ部200aを備えた無線式ヘッドセット200、及び、充電器201を例にして説明する(図8参照)。
まず、図9に示すように、充電池9の容量、及び、充電池9の充電に必要とされる充電電流から、受電モジュール3が受電する受電電力量が決まる(S1)。
上記製造方法の説明では、無線式ヘッドセット200を例示して説明したが、充電池を備えた機器であれば、タブレット型PC、デジタルカメラ、携帯電話、イヤホン型音楽プレイヤー、補聴器、集音器などにも使用することができる。
2 給電モジュール
3 受電モジュール
6 交流電源
7 安定回路
8 充電回路
9 充電池
10 被給電機器
21 給電コイル
22 給電共振器
31 受電コイル
32 受電共振器
200 無線式ヘッドセット
201 充電器
Claims (10)
- 給電共振器を備えた給電モジュールから、受電共振器を備えた受電モジュールに対して磁界を変化させて電力を供給する無線電力伝送装置の供給電力制御方法であって、
前記給電共振器及び前記受電共振器の少なくとも一方が有する共振周波数を調整することにより、当該無線電力伝送装置の入力インピーダンスの値を設定して前記供給する電力を制御することを特徴とする無線電力伝送装置の供給電力制御方法。 - 給電共振器を備えた給電モジュールから、受電共振器を備えた受電モジュールに対して磁界を変化させて電力を供給する無線電力伝送装置の供給電力制御方法であって、
前記給電共振器が有する共振周波数及び前記受電共振器が有する共振周波数を一致させた場合における、前記給電モジュールに供給する電力の駆動周波数に対する伝送特性の値、又は、前記給電共振器と前記受電共振器との間の結合係数の値を、電力伝送効率を規定する基準値とし、
当該基準値を含む所望の範囲で、前記給電共振器及び前記受電共振器の少なくとも一方が有する共振周波数を調整することにより、当該無線電力伝送装置の入力インピーダンスの値を設定して前記供給する電力を制御することを特徴とする請求項1に記載の無線電力伝送装置の供給電力制御方法。 - 少なくとも給電コイル及び給電共振器を備えた給電モジュールから、少なくとも受電共振器及び受電コイルを備えた受電モジュールに対して共振現象によって電力を供給することを特徴とする請求項1又は2に記載の無線電力伝送装置の供給電力制御方法。
- 前記給電モジュールに供給する電力の駆動周波数に対する伝送特性の値が、前記給電モジュール及び受電モジュールにおける共振周波数よりも低い駆動周波数帯域及び前記共振周波数よりも高い駆動周波数帯域にそれぞれピークを有する双峰性の特性を有するように、前記給電モジュール及び前記受電モジュールを構成する可変可能なパラメータを設定し、前記給電モジュールに供給する電力の前記駆動周波数を、前記給電モジュール及び受電モジュールにおける前記共振周波数よりも低い駆動周波数帯域に現れる伝送特性のピーク値に対応する帯域に設定することにより、
前記給電共振器が有する共振周波数は、前記給電共振器が有する共振周波数が大きくなるにつれて、当該無線電力伝送装置の入力インピーダンスの値が小さくなる特性に基づき調整されることを特徴とする請求項3に記載の無線電力伝送装置の供給電力制御方法。 - 前記給電モジュールに供給する電力の駆動周波数に対する伝送特性の値が、前記給電モジュール及び受電モジュールにおける共振周波数よりも低い駆動周波数帯域及び前記共振周波数よりも高い駆動周波数帯域にそれぞれピークを有する双峰性の特性を有するように、前記給電モジュール及び前記受電モジュールを構成する可変可能なパラメータを設定し、前記給電モジュールに供給する電力の前記駆動周波数を、前記給電モジュール及び受電モジュールにおける前記共振周波数よりも低い駆動周波数帯域に現れる伝送特性のピーク値に対応する帯域に設定することにより、
前記受電共振器が有する共振周波数は、前記受電共振器が有する共振周波数が大きくなるにつれて、当該無線電力伝送装置の入力インピーダンスの値が大きくなる特性に基づき調整されることを特徴とする請求項3に記載の無線電力伝送装置の供給電力制御方法。 - 前記給電モジュールに供給する電力の駆動周波数に対する伝送特性の値が、前記給電モジュール及び受電モジュールにおける共振周波数よりも低い駆動周波数帯域及び前記共振周波数よりも高い駆動周波数帯域にそれぞれピークを有する双峰性の特性を有するように、前記給電モジュール及び前記受電モジュールを構成する可変可能なパラメータを設定し、前記給電モジュールに供給する電力の前記駆動周波数を、前記給電モジュール及び受電モジュールにおける前記共振周波数よりも高い駆動周波数帯域に現れる伝送特性のピーク値に対応する帯域に設定することにより、
前記給電共振器が有する共振周波数は、前記給電共振器が有する共振周波数が大きくなるにつれて、当該無線電力伝送装置の入力インピーダンスの値が大きくなる特性に基づき調整されることを特徴とする請求項3に記載の無線電力伝送装置の供給電力制御方法。 - 前記給電モジュールに供給する電力の駆動周波数に対する伝送特性の値が、前記給電モジュール及び受電モジュールにおける共振周波数よりも低い駆動周波数帯域及び前記共振周波数よりも高い駆動周波数帯域にそれぞれピークを有する双峰性の特性を有するように、前記給電モジュール及び前記受電モジュールを構成する可変可能なパラメータを設定し、前記給電モジュールに供給する電力の前記駆動周波数を、前記給電モジュール及び受電モジュールにおける前記共振周波数よりも高い駆動周波数帯域に現れる伝送特性のピーク値に対応する帯域に設定することにより、
前記受電共振器が有する共振周波数は、前記受電共振器が有する共振周波数が大きくなるにつれて、当該無線電力伝送装置の入力インピーダンスの値が小さくなる特性に基づき調整されることを特徴とする請求項3に記載の無線電力伝送装置の供給電力制御方法。 - 前記給電共振器及び前記受電共振器はコンデンサを備え、
前記給電共振器及び前記受電共振器が有する共振周波数は、それぞれの前記コンデンサの容量を変えることにより調整されることを特徴とする請求項1~7の何れかに記載の無線電力伝送装置の供給電力制御方法。 - 請求項1~8の何れかに記載の供給電力制御方法により調整されたことを特徴とする無線電力伝送装置。
- 給電共振器を備えた給電モジュールから、受電共振器を備えた受電モジュールに対して磁界を変化させて電力を供給する無線電力伝送装置の製造方法であって、
前記給電共振器が有する共振周波数及び前記受電共振器が有する共振周波数を一致させた場合における、前記給電モジュールに供給する電力の駆動周波数に対する伝送特性の値、又は、前記給電共振器と前記受電共振器との間の結合係数の値を、電力伝送効率を規定する基準値とし、
当該基準値を含む所望の範囲で、前記給電共振器及び前記受電共振器の少なくとも一方が有する共振周波数を調整することにより、当該無線電力伝送装置の入力インピーダンスの値を設定して前記供給する電力を制御する工程を含むことを特徴とする無線電力伝送装置の製造方法。
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CN201480019522.4A CN105122575A (zh) | 2013-04-01 | 2014-01-30 | 无线电力传输装置、无线电力传输装置的供给电力控制方法以及无线电力传输装置的制造方法 |
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KR101986362B1 (ko) * | 2017-09-20 | 2019-06-05 | 한국철도기술연구원 | 고주파 전원 전달 장치 |
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