Method of and Receiver for Communication During Wireless Power Transmission
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United States of America Patent
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Issued Date -
Aug 6, 2015
app pub date -
Aug 23, 2013
filing date -
Sep 17, 2012
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Abstract
In a wireless power charger a receiver (6) is inductively coupled to a transmitter (1) to receive power for charging an accumulator in a device (11). The receiver (6) communicates charging data to the transmitter (1) by imposing current pulses across the direct current output terminals of a rectifier (9) in the receiver. To enhance the performance of the receiver without reducing the signal to noise ratio of the current pulse receiver to transmitter communication the shape of unwanted transient currents in a filter capacitor (10) are sensed and the transient current shape added to an ideal rectangular step function pulse shape to produce a communication pulse shape. As a result the communication pulse shape seen at a secondary inductor (7) of the receiver closely approximates the ideal rectangular step function shape desired whereby the signal to noise ratio is kept high. The receiver is particularly useful in mobile devices such as cell phones, tablet PC's and laptops.
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