Abstract: A method of configuring windings in an inductive charging pad array by using capacitors for impedance control and configuring windings to reduce the stray magnetic fields produced.

Abstract: A method of configuring windings in an inductive charging pad array by using capacitors for impedance control and configuring windings to reduce the stray magnetic fields produced.

Abstract: An apparatus for controlling start up of supply voltages received from a power supply responding to control by a feedback signal includes: (a) first error amplifiers receiving a supply voltage at a first terminal, receiving a reference voltage at a second terminal and providing a first error signal to a switch indicating difference between the signals at the terminals; and (b) second error amplifiers having a first node coupled with the switch and for receiving the supply voltage and a second node receiving a reference voltage; the first node receives a sum of the first error signal and the supply voltage when the switch is in a first orientation, and receives the supply voltage when the switch is in a second orientation; each second error amplifier provides a second error signal indicating a difference between signals received at the nodes that is the feedback signal for controlling the power supply.

Abstract: A four quadrant flyback converter, employable as part of a ringing signal generator, includes: (1) a transformer having first and second primary windings of opposite polarity and a secondary winding, (2) first and second switches that alternatively couple the first and second windings, respectively, to a source of DC input power and (3) a bidirectional switch coupling the secondary winding to an output of the converter, the first, second and bidirectional switches switchable to provide a continuous waveform at the output.