Method of and Receiver for Communication During Wireless Power Transmission
First Claim
1. A wireless power receiver, the receiver having a secondary inductor to receive power via an inductive coupling with an independent power supply, the receiver having a rectifier, in circuit with a current modulator responsive to a controller to superimpose a pulsed current signal for inductive communication with an inductively coupled power supply;
- wherein the current modulator is adapted to shape the signal current pulse in such a way that after circuit distortion, the communication pulse shape seen by the secondary inductor more closely resembles an ideal rectangular step function.
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Accused Products
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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Citations
15 Claims
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1. A wireless power receiver, the receiver having a secondary inductor to receive power via an inductive coupling with an independent power supply, the receiver having a rectifier, in circuit with a current modulator responsive to a controller to superimpose a pulsed current signal for inductive communication with an inductively coupled power supply;
wherein the current modulator is adapted to shape the signal current pulse in such a way that after circuit distortion, the communication pulse shape seen by the secondary inductor more closely resembles an ideal rectangular step function. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of signal transmission between a wireless power receiver, and a wireless power transmitter, the wireless power receiver having a receiver circuit including an inductor inductively coupled to the wireless power transmitter, comprising:
generating a sequence of signal current pulses in the receiver circuit, characterized by the step of shaping each signal current pulse so that the effect of circuit distortion causes the shape of the pulse seen at the inductor of the receiver more closely resembles a rectangular step function. - View Dependent Claims (11, 12, 13)
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14. A wireless power receiver, the receiver having an inductor to receive power via an inductive couple with an independent power supply, the receiver having a rectifier including a filter capacitor, in circuit with a current modulator responsive to a controller to superimpose a pulsed current signal for inductive communication with an inductively coupled power supply;
wherein the current modulator is connected across the direct current terminals of the rectifier.
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15. A wireless power receiver, the receiver having an inductor to receive power via an inductive couple with an independent power supply, a reactive current modulator responsive to a controller to generate a pulsed current signal for inductive communication with the inductively coupled power supply;
wherein the reactive current modulator is provided by a capacitor in series with a make break switch and connected in parallel with the inductor, said switch being responsive to the controller to modulate each communication current pulse.
Specification