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1. (WO2015114288) A CHARGING APPARATUS
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CLAIMS

1. Apparatus for charging a rechargeable storage medium of an electrically powered device, the apparatus comprising:

a charging inductance for wirelessly supplying energy to the device containing the storage medium to be charged;

a tuning circuit for setting a resonant frequency of the charging inductance; and a driver circuit for driving the charging inductance,

wherein

the driver circuit comprises a neutral point clamp (NPC) circuit.

2. Apparatus according to claim 1 wherein the tuning circuit comprises a series combination of a capacitance and the charging inductance.

3. Apparatus according to claim 1 or claim 2 wherein the tuning circuit is configured to set the resonant frequency of the charging inductance to between around 70 kHz and around 130 kHz.

4. Apparatus according to any one of the preceding claims wherein the driver circuit comprises:

a first capacitance and a second capacitance connected in series;

a switch sub-circuit comprising a plurality of switches connected in parallel with the first and second capacitances;

a first diode and a second diode, the first and second diodes being connected to the first and second capacitances and the switch sub-circuit to provide current paths from the first and second capacitances; and

a controller,

wherein

the controller is operative to actuate the plurality of switches in a predetermined sequence such that the driver circuit is operative to convert a direct current input into an alternating current at an output of the switch cub-circuit.

5. Apparatus according to claim 4 wherein the switch sub-circuit comprises four switches.

6. Apparatus according to claim 4 or claim 5 wherein the switches comprise N-channel or P-channel MOSFETs.

7. Apparatus according to any one of the preceding claims further comprising a modulator for imparting a binary phase shift keying (BPSK) modulation to a signal that drives the charging inductance.

8. Apparatus according to claim 7 wherein the modulator is configured to reverse a timing sequence of the signal that drives the charging inductance.

9. Apparatus according to any one of the preceding claims further comprising a demodulator for demodulating amplitude modulated (AM) signals.

10. Apparatus according to any one of the preceding claims further comprising a modulator for generating amplitude modulated (AM) signals.

11. A secure transport container for transporting or storing valuable items, the secure transport container including apparatus according to any one of the preceding claims.

12. A charging system comprising:

an electrically powered device having a rechargeable storage medium; and an apparatus according to any one of claims 1 to 10.

13. A charging system according to claim 12, wherein the electrically powered device comprises a modulator for generating an amplitude modulated signal.

14. A charging system according to claim 13 wherein the modulator is configured to add a load to and to remove a load from output nodes of a rectifier of the electrically powered device to generate the amplitude modulated signal.

15. A charging system according to claim 12 wherein the electrically powered device comprises a demodulator for demodulating binary phase shift keying (BPSK) signals.