Sure. Only the coils on the transmit side (the surface) are resonant. To build this, you essentially build a transformer with a non-resonant primary (a coil of wire) and a resonant secondary (another coil of wire connected to a capacitor).
In the picture of the upside-down surface, you can see the primary (about 1/4 of the area of the surface). It is loosely coupled, by proximity, to the larger secondary coil that follows the circumference of the power surface. The secondary is connected to four high-voltage capacitors (two parallel strings, each string having two capacitors in series). The capacitors are chosen to achieve the desired resonant frequency -- a function of the coil's inductance and the capacitors' capacitance.
To actually perform charging, place another coil connected to a load (such as a resistor) on the surface. If you have an oscilloscope, you should see an AC voltage across the resistor terminals. This power is being transferred to the resistive load. You can make more elaborate loads that rectify this AC voltage to provide DC. Then you can use the energy to power a load of your choice -- such as a robot!
6:06 pm
Sure. Only the coils on the transmit side (the surface) are resonant. To build this, you essentially build a transformer with a non-resonant primary (a coil of wire) and a resonant secondary (another coil of wire connected to a capacitor).
In the picture of the upside-down surface, you can see the primary (about 1/4 of the area of the surface). It is loosely coupled, by proximity, to the larger secondary coil that follows the circumference of the power surface. The secondary is connected to four high-voltage capacitors (two parallel strings, each string having two capacitors in series). The capacitors are chosen to achieve the desired resonant frequency -- a function of the coil's inductance and the capacitors' capacitance.
To actually perform charging, place another coil connected to a load (such as a resistor) on the surface. If you have an oscilloscope, you should see an AC voltage across the resistor terminals. This power is being transferred to the resistive load. You can make more elaborate loads that rectify this AC voltage to provide DC. Then you can use the energy to power a load of your choice -- such as a robot!