Integrated Device Technology Inc. | Date: 2015-01-09
An inductive wireless power transfer device comprises a transmitter that comprises a transmit coil configured to generate a wireless power signal to a coupling region in response to an input voltage, and a modulator configured to modulate the wireless power signal and encode data with the wireless power signal to establish a back-channel communication link from the transmitter to a receiver. An inductive wireless power receiving device comprises a receiver that comprises a receive coil configured to generate a time varying signal in response to receiving a modulated wireless power signal from a transmitter in a coupling region, and a demodulator configured to demodulate the modulated wireless power signal from an established back-channel communication link from the transmitter to a receiver. Related inductive wireless power transfer systems and methods for back-channel communication from the transmitter to the receiver of an inductive wireless power transfer system are disclosed.
Integrated Device Technology Inc. | Date: 2015-03-27
The present disclosure relates wireless power transfer. In some embodiments, DC power is received through one or more inductors and switched to provide alternating current through a TX coil with a pair of power FETs coupled between opposite sides of the TX coil and ground such that current flows through one of the pair of FETs at a time. In some embodiments, the pair of FETs can be driven in adaptive resonant mode to operate at a resonance. In some embodiments, the pair of FETs are driven at a particular frequency.
Integrated Device Technology Inc. | Date: 2015-05-01
A system and method of wireless power transfer using a two half-bridge to one full-bridge switchover includes a wireless power transfer system. The wireless power transfer system includes a controller, first and second transmitters coupled to the controller, the first and second transmitters being coupled to one another by an electrical connection, and a switch coupled between the electrical connection and a voltage rail. When the switch is closed, the controller operates the first and second transmitters in a two half-bridge mode. When the switch is open, the controller operates the first and second transmitters in a one full-bridge mode.
Integrated Device Technology Inc. | Date: 2015-04-16
In accordance with some embodiments, a transmitter for wireless transfer includes a rectifier that receives an AC voltage and provides a DC voltage; a capacitor that receives and smooths the DC voltage; a regulator that receives the DC voltage and outputs an input voltage; and a wireless transmitter that receives the input voltage and transmits wireless power.
Integrated Device Technology Inc. | Date: 2014-03-14
A charging system includes a temperature sensor to generate a temperature signal responsive to a temperature of an energy storage device. A circuit temperature sensor generates a circuit temperature signal responsive to a temperature of a semiconductor device. A charge adjuster generates a desired current signal responsive to the temperature signal and the circuit temperature signal. A comparator compares a charge-current level signal to the desired current signal to generate a charge adjustment signal. A charge controller on the semiconductor device generates and adjusts a current of a charging signal for charging the energy storage device responsive to the charge adjustment signal. The charge adjuster may generate a reduction signal when the temperature signal is above a throttle threshold, reduce a digital desired current signal responsive to the reduction signal, and convert the digital desired current signal to the desired current signal as an analog signal.