Wireless power transmission unit and power generator and power generation system with the wireless power unit

A power generator comprising:

• 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 resonant magnetic coupling, 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 second inductor is coupled with the first inductor by a resonant magnetic field at a coupling coefficient k which is set to be less than 0.5, and
• the power generator satisfies (L2/L1)≧4(k/Voc)2.

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;
• a second antenna for receiving, by resonant magnetic coupling, 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 second inductor is coupled with the first inductor by a resonant magnetic field at a coupling coefficient k which is set to be less than 0.5, and
• the power transmission unit satisfies (L2/L1)≧4(k/(Voc×Vrr))2.

A power generator comprising:

• 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 resonant magnetic coupling, 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 second inductor is coupled with the first inductor by a resonant magnetic field at a coupling coefficient k which is set to be less than 0.5, and
• the power generator satisfies (L2/L1)≧4(k/(Voc×Vrr))2.