Power Mole transmits electricity through window glass

The prototype Power Mole wirelessly transmits 10 watts of electricity through window glass, allowing indoor outlets to power outdoor devices.

It is built on the inductive coupling technology utilised in wireless smartphone charging systems. Currently the subject of a Kickstarter campaign, the Power Mole was created by California-based inventor Peter Bevelacqua. The Power Mole is made for situations in which devices such as security cameras or decorative lights need a power source when there are no outdoor outlets nearby.

The setup consists of two components: the transmitter, which is adhered to the inside surface of a windowpane, and the receiver, which is adhered to the outside of the pane. The transmitter is plugged into an indoor household outlet, while the receiver is USB hard-wired to the outdoor device.

As an alternating electric current passes through an induction coil in the transmitter, a fluctuating magnetic field is generated. That field passes through up to 30 mm of glass, producing an alternating electric current in the receiver's induction coil. An integrated rectifier converts that AC current to DC which powers the product plugged in.

If the transmitter is plugged in but cannot connect to the receiver, it automatically shuts off in order to save electricity. The system also isn't limited to use with glass, as it can additionally transmit through wood or any other non-metallic material. If metal is detected between the transmitter and receiver, the transmitter shuts itself off.

It is important to note that in its present form, the Power Mole is limited to use with devices that utilise a USB or 5-volt input.

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