Integrated multi-source IPT system
An IPT primary or secondary circuit includes a converter connected to a primary energy source and a compensation network. A supplementary energy source is connected to the compensation network and the converter transfers energy between the primary energy source or another IPT primary or secondary circuit and the supplementary energy source.
1. An inductive power transfer (IPT) primary or secondary circuit for transferring energy to or from a magnetic flux coupler, the circuit comprising:
a converter having a first side associated with a primary source and second side associated with a compensation network;
the compensation network being configured to supply or receive energy to or from the magnetic flux coupler; and
a supplementary source provided between the second side and the magnetic flux coupler,
wherein the converter is operable to transfer energy between the primary source or another IPT primary or secondary circuit and the supplementary source,
wherein the converter controls power transfer between the primary source and the supplementary source, and
wherein at least one of:
the converter transfers direct current to or from the supplementary source and simultaneously supplies alternating current to the compensation network for inductive power transfer; or
the converter transfers direct current to or from the supplementary source and simultaneously rectifies alternating current from the compensation network.
2. The IPT primary or secondary circuit as claimed in claim 1 , wherein the converter is also operable to energize the compensation network, or rectify current induced in the compensation network to facilitate transfer of energy to or from the other IPT secondary or primary circuit.
3. The IPT primary or secondary circuit as claimed in claim 1 , wherein the primary source and/or the supplementary source can receive and supply energy.
4. The IPT primary or secondary circuit as claimed in claim 1 , wherein the converter comprises a plurality of switches and the converter uses the switches of the converter to control the power transfer between the primary source and the supplementary source by controlling switches of the converter.
5. The IPT primary or secondary circuit as claimed in claim 4 , wherein the switches of the converter are controlled by a controller to transfer energy to or from the supplementary source by transferring direct current to or from the supplementary source.
6. The IPT primary or secondary circuit as claimed in claim 1 , wherein the converter transfers direct current to or from the supplementary source and simultaneously supplies alternating current to the compensation network for inductive power transfer.
7. The IPT primary or secondary circuit as claimed in claim 1 , wherein the converter transfers direct current to or from the supplementary source and simultaneously rectifies alternating current from the compensation network.
8. The IPT primary or secondary circuit as claimed in claim 1 , wherein the supplementary source is connected in series with the compensation network.
9. An IPT system comprising a primary IPT circuit and a secondary IPT circuit according to claim 1 .
10. A method of controlling energy flow in a primary or secondary circuit of an IPT system, the method comprising:
switching an alternating current to transfer power inductively;
switching a direct current to or from a supplementary source provided between a converter and a magnetic flux coupler associated with the primary or secondary circuit,
wherein the converter controls power transfer between a primary source and the supplementary source, and
the method further comprises transferring, with the converter, direct current to or from the supplementary source and simultaneously rectifying alternating current from a compensation network.
11. The method as claimed in claim 10 wherein the switching is performed using the converter.
12. The IPT primary or secondary circuit as claimed in claim 1 wherein the supplementary source is connected to the compensation network.
13. The IPT primary or secondary source as claimed in claim 1 wherein the supplementary source is connected to the second side.
14. The IPT primary or secondary source as claimed in claim 1 wherein the supplementary source is connected to the magnetic flux coupler.
15. The IPT primary or secondary circuit as claimed in claim 4 , wherein the switches of the converter are controlled by a controller to transfer energy to or from the supplementary source by transferring direct current to or from the supplementary source.
16. The IPT primary or secondary circuit as claimed in claim 5 , wherein the switches are controlled to transfer direct current to or from the supplementary source and simultaneously supply alternating current to the compensation network for inductive power transfer.
17. The IPT primary or secondary circuit as claimed in claim 5 , wherein the switches are controlled to transfer direct current to or from the supplementary source and simultaneously rectify alternating current from the compensation network.
18. The IPT primary or secondary circuit as claimed in claim 4 , wherein the switches are controlled to transfer direct current to or from the supplementary source and simultaneously rectify alternating current from the compensation network.
19. A method of controlling energy flow in a primary or secondary circuit of an IPT system, the method comprising:
switching an alternating current to transfer power inductively; and
switching a direct current to or from a supplementary source provided between a converter and a magnetic flux coupler associated with the primary or secondary circuit,
wherein the converter controls power transfer between a primary source and the supplementary source, and
the method further comprises transferring, with the converter, direct current to or from the supplementary source and simultaneously supplying alternating current to a compensation network for inductive power transfer.
20. The method as claimed in claim 19 wherein the switching is performed using the converter.