INDUCTIVE POWER SUPPLY WITH DUTY CYCLE CONTROL

摘要

An inductive power supply that maintains resonance and adjusts duty cycle based on feedback from a secondary circuit. A controller, driver circuit and switching circuit cooperate to generate an AC signal at a selected operating frequency and duty cycle. The AC signal is applied to the tank circuit to create an inductive field for powering the secondary. The secondary communicates feedback about the received power back to the primary controller. The power transfer efficiency may be optimized by maintaining the operating frequency substantially at resonance, and the amount of power transferred may be controlled by adjusting the duty cycle.

主权项

1. An inductive power supply for providing power wirelessly to a remote device, said inductive power supply comprising:
a primary circuit for controlling power transfer to the remote device according to at least one operating parameter, said primary circuit configured to adjust a duty cycle of a signal to allow variation in an amount of power transferred to the remote device; a wireless receiver configured to receive information communicated from the remote device; a tank circuit in electrical communication with said primary circuit, said tank circuit configured to inductively couple with the remote device; wherein said primary circuit controls said at least one operating parameter to achieve a desired operating efficiency; and wherein said primary circuit controls said duty cycle of said signal to maintain an amount of power transferred despite variations in operating conditions that affect resonant frequency.