CONVERTER
An inductive power receiver 3 including at least two switches S 1 , S 2 connected across a resonant circuit 802 , the resonant circuit including an inductance and a capacitance, wherein a first switch S 1 of the at least two switches is configured to switch into a first state based on a first event dependent on a receiver variable; and the first switch is configured to switch to a second state based on a second event independent of a receiver variable.
1 . An inductive power receiver including at least two switches connected across a resonant circuit, the resonant circuit including an inductance and a capacitance, wherein:
a first switch of the at least two switches is configured to switch into a first state based on a first event dependent on a receiver variable; and
the first switch is configured to switch to a second state based on a second event independent of a receiver variable.
2 . The receiver in claim 1 , wherein the first event is the voltage across or current in the first switch reaching, crossing through, or rising from zero.
3 . The receiver in claim 2 , wherein the second event is the conclusion of a delay.
4 . The receiver in claim 3 , wherein the delay starts from when a second switch of the at least two switches, switches to the second state.
5 . The receiver in claim 3 , wherein the delay is determined based on a predetermined DC output voltage.
6 . The receiver in claim 5 where the predetermined DC output voltage is selected from the group consisting of a buck voltage and a boost voltage.
7 . The receiver in claim 3 , wherein the delay is determined based on predetermined criteria.
8 . The receiver in claim 3 , further comprising a closed loop controller configured to provide switching signals to the at least two switches, to control the DC output voltage to a substantially predetermined level.
9 . The receiver in claim 1 wherein the resonant circuit includes a pair of receiving coils in series or a split receiving coil, in parallel with a capacitor, and wherein a common point between the coils is connected to a DC load.
10 . The receiver in claim 1 wherein the resonant circuit includes a receiving coil in parallel with a capacitor, and the receiver further comprises two inductors, each connected between a respective switch and a DC load.
11 . The receiver in claim 1 wherein the combination of the at least two switches connected across a resonant circuit is a modified push pull converter or modified current doubling rectifier circuit.
12 . The receiver in claim 1 wherein the first state is an ON state and the second state is an OFF state.