Wireless charging systems with in-band communications
First Claim
1. An electronic device configured to receive wirelessly transmitted power signals from a power transmitting device, comprising:
- a coil configured to receive the wirelessly transmitted power signals;
a rectifier coupled to the coil, wherein the rectifier has transistors configured to rectify the power signals and produce a corresponding rectified direct-current voltage;
a capacitor configured to be charged by the rectified direct-current voltage; and
control circuitry having a data transmitter configured to transmit data to the power transmitting device by applying a series of current pulses to the coil using the transistors in the rectifier while the coil is not receiving the wirelessly transmitted power signals.
1 Assignment
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Accused Products
Abstract
A wireless power transmitting device may have control circuitry that supplies drive signals to a coil to produce wireless power signals. The wireless power receiving device may have a coil that receives the transmitted wireless power signals from the wireless power transmitting device. The wireless power receiving device may have a rectifier that rectifies signals received by the coil in the wireless power receiving device and that provides a rectified voltage to a capacitor. A charger in the wireless power receiving device may charge a battery in the device using the rectified voltage. When it is desired to convey information to the wireless power transmitting device, the wireless power transmitting device may cease the transmission of wireless power and the wireless power receiving device may modulate transistors in the rectifier to transmit data to the wireless power transmitting device.
23 Citations
23 Claims
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1. An electronic device configured to receive wirelessly transmitted power signals from a power transmitting device, comprising:
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a coil configured to receive the wirelessly transmitted power signals; a rectifier coupled to the coil, wherein the rectifier has transistors configured to rectify the power signals and produce a corresponding rectified direct-current voltage; a capacitor configured to be charged by the rectified direct-current voltage; and control circuitry having a data transmitter configured to transmit data to the power transmitting device by applying a series of current pulses to the coil using the transistors in the rectifier while the coil is not receiving the wirelessly transmitted power signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for communicating between a wireless power receiving device and a wireless power transmitting device, comprising:
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with the wireless power receiving device, receiving transmitted wireless power from the wireless power transmitting device with a receiving device coil and a rectifier that has at least a pair of transistors coupled in series across a capacitor in the wireless power receiving device; with the wireless power receiving device, charging the capacitor in the wireless power receiving device using the received transmitted wireless power; and transmitting data to the wireless power transmitting device with a control circuit in the wireless power receiving device by applying signal pulses to the receiving device coil while wireless power transmission from the wireless power transmitting device is paused and while the capacitor is supplying power to the control circuit. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. An electronic device that is configured to operate in a system with a wireless power transmitting device, comprising:
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a coil that is configured to receive wireless power from the wireless power transmitting device; a rectifier coupled to the coil; a capacitor that is configured to be charged with wireless power received from the coil using the rectifier; and a data transmitter configured to transmit data bits to the wireless power transmitting device while wireless power transmission by the wireless power transmitting device is paused by applying signal pulses to the coil that induce signal ringing in the wireless power transmitting device. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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Specification