Abstract: A WPT transmitter pad comprising: a cover, a coil, a metallic frame, and a frame magnetic sheet between the metallic frame and the cover.

Abstract: A soft switching sub-circuit forming part of or for use with a circuit. The soft switching sub-circuit comprises a bridge switching circuit. The soft switching sub-circuit is configured and operable to provide a varying current output that tracks output current from the bridge switching circuit to create a substantially zero current through at least one switch component of the bridge switching circuit to enable soft switching.

Abstract: A charging unit for wireless power transfer. The charging unit includes at least one coil for inductive power transfer, a sensor coil array with a sensing field for sensing the presence of at least one foreign object, and a controller. The controller is configured to move the sensor coil array and/or sensing field so that the sensing field can scan a sensing region, and configured to detect the presence of the at least one foreign object in the sensing region based on the sensing array output. The sensor coil array and/or sensing field is moveable such that the sensing field can be: a) positioned in the sensing region so that the sensing field does not overlap the at least one foreign object, and also b) positioned in the sensing region so that the sensing field does overlap the at least one foreign object.