WIRELESS POWER TRANSMISSION UNIT AND POWER GENERATOR AND POWER GENERATION SYSTEM WITH THE WIRELESS POWER UNIT
First Claim
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1. A wireless power transmission unit comprising:
- an oscillator for converting DC energy into RF energy having a frequency f0;
a first antenna for transmitting the RF energy, the first antenna including a first inductor and a first capacitor that are connected together in series to form a series resonant circuit with a resonant frequency fT; and
a second antenna for receiving, by coupling a resonant magnetic field, at least a part of the RF energy that has been transmitted by the first antenna, the second antenna including a second inductor and a second capacitor that are connected in parallel with each other to form a parallel resonant circuit with a resonant frequency fR,wherein the resonant frequencies fT and fR are set to be substantially equal to the frequency f0 of the RF energy,the oscillator has a voltage step-up ratio Voc,the first inductor has an inductance L1,the second inductor has an inductance L2, the first and second antennas have a coupling coefficient k, andthe power transmission unit satisfies (L2/L1)≧
4(k/Voc)2.
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Abstract
A wireless power transmission unit that can increase the low output voltage of a power generating section effectively is provided. The wireless power transmission unit includes:
- an oscillator for converting DC energy into RF energy having a frequency f0; a first antenna to transmit the RF energy; and a second antenna to receive at least a part of the RF energy transmitted by the first antenna. The first antenna is a series resonant circuit in which a first inductor and a first capacitor are connected together in series. The second antenna is a parallel resonant circuit in which a second inductor and a second capacitor are connected in parallel with each other. The resonant frequencies fT and fR of the first and second antennas and are set to be equal to the frequency f0 of the RF energy. If the oscillator has a voltage step-up ratio Voc, the first and second inductors and have inductances L1 and L2, respectively, and the first and second antennas have a coupling coefficient k, (L2/L1)≧4(k/Voc)2 is satisfied.
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Citations
25 Claims
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1. A wireless power transmission unit comprising:
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an oscillator for converting DC energy into RF energy having a frequency f0; a first antenna for transmitting the RF energy, the first antenna including a first inductor and a first capacitor that are connected together in series to form a series resonant circuit with a resonant frequency fT; and a second antenna for receiving, by coupling a resonant magnetic field, at least a part of the RF energy that has been transmitted by the first antenna, the second antenna including a second inductor and a second capacitor that are connected in parallel with each other to form a parallel resonant circuit with a resonant frequency fR, wherein the resonant frequencies fT and fR are set to be substantially equal to the frequency f0 of the RF energy, the oscillator has a voltage step-up ratio Voc, the first inductor has an inductance L1, the second inductor has an inductance L2, the first and second antennas have a coupling coefficient k, and the power transmission unit satisfies (L2/L1)≧
4(k/Voc)2.
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2. A power generator comprising:
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a power generating section for outputting DC energy; and a wireless power transmission unit, which is connected to the power generating section, wherein the wireless power transmission unit includes; an oscillator for converting the DC energy into RF energy having a frequency f0; a first antenna for transmitting the RF energy, the first antenna including a first inductor and a first capacitor that are connected together in series to form a series resonant circuit with a resonant frequency fT; and a second antenna for receiving, by coupling a resonant magnetic field, at least a part of the RF energy that has been transmitted by the first antenna, the second antenna including a second inductor and a second capacitor that are connected in parallel with each other to form a parallel resonant circuit with a resonant frequency fR, wherein the resonant frequencies fT and fR are set to be substantially equal to the frequency f0 of the RF energy, the oscillator has a voltage step-up ratio Voc, the first inductor has an inductance L1, the second inductor has an inductance L2, the first and second antennas have a coupling coefficient k, and the power generator satisfies (L2/L1)≧
4(k/Voc)2. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A wireless power transmission unit comprising:
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an oscillator for converting DC energy into RF energy having a frequency f0; a first antenna for transmitting the RF energy, the first antenna including a first inductor and a first capacitor that are connected together in series to form a series resonant circuit with a resonant frequency fT; a second antenna for receiving, by coupling a resonant magnetic field, at least a part of the RF energy that has been transmitted by the first antenna, the second antenna including a second inductor and a second capacitor that are connected in parallel with each other to form a parallel resonant circuit with a resonant frequency fR; and a rectifier for converting the RF energy supplied from the second antenna into DC energy, wherein the resonant frequencies fT and fR are set to be substantially equal to the frequency f0 of the RF energy, the oscillator has a voltage step-up ratio Voc, the rectifier has a voltage step-up ratio Vrr, the first inductor has an inductance L1, the second inductor has an inductance L2, the first and second antennas have a coupling coefficient k, and the power transmission unit satisfies (L2/L1)≧
4(k/(Voc×
Vrr))2.
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17. A power generator comprising:
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a power generating section for outputting DC energy; and a wireless power transmission unit, which is connected to the power generating section, wherein the wireless power transmission unit includes; an oscillator for converting the DC energy into RF energy having a frequency f0; a first antenna for sending out the RF energy, the first antenna including a first inductor and a first capacitor that are connected together in series to form a series resonant circuit with a resonant frequency fT; a second antenna for receiving, by coupling a resonant magnetic field, at least a part of the RF energy that has been transmitted by the first antenna, the second antenna including a second inductor and a second capacitor that are connected in parallel with each other to form a parallel resonant circuit with a resonant frequency fR; and a rectifier for converting the RF energy supplied from the second antenna into DC energy, wherein the resonant frequencies fT and fR are set to be substantially equal to the frequency f0 of the RF energy, the oscillator has a voltage step-up ratio Voc, the rectifier has a voltage step-up ratio Vrr, the first inductor has an inductance L1, the second inductor has an inductance L2, the first and second antennas have a coupling coefficient k, and the power generator satisfies (L2/L1)≧
4(k/(Voc×
Vrr))2. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25)
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Specification