Patent ID: 8093758
Filing Date: 2012-01-10
Classification: H02J,H02M,Y02B,Y02P

Abstract:
1. An inductively coupled power transfer pick-up comprising: a pick-up resonant circuit comprising a capacitive element and an inductive element adapted to receive power from a magnetic field associated with a primary conductive path to supply a load, one of the capacitive element and the inductive element comprising a controlled reactive element; a phase device configured to sense the phase of a voltage or current in the pick-up resonant circuit; a sensor configured to sense a power requirement of the load; and a controller configured to selectively tune or de-tune the pick-up resonant circuit in response to the load power requirement sensed by the sensor by selectively electrically connecting or disconnecting the controlled reactive element to or from the pick-up resonant circuit in each cycle of the voltage or current dependent on the sensed phase to vary the effective capacitance or inductance of the controlled reactive element of the pick-up resonant circuit to control the transfer of power to the pick-up resonant circuit dependant on the sensed load power requirement.