Method and apparatus for resonant power conversion
View Patent ↗A method and apparatus for providing multi-phase power. In one embodiment, the apparatus comprises a cycloconverter controller for determining a charge ratio based on a reference waveform; and a cycloconverter, coupled to the cycloconverter controller and to a multi-phase AC line, for selectively coupling an alternating current to each line of the multi-phase AC line based on the charge ratio.
1. An apparatus for providing multi-phase power, comprising:
a transformer comprising a primary winding and a secondary winding;
a resonant circuit coupled to the primary winding;
a cycloconverter controller for determining a charge ratio based on a reference waveform; and a cycloconverter, coupled to the secondary winding, to the cycloconverter controller and to a multi-phase AC line, for selectively coupling an alternating current to each line of the multi-phase AC line based on the charge ratio, wherein the alternating current results from the resonant circuit and is a sinusoidally shaped single-phase waveform; and
wherein selectively coupling the alternating current comprises partitioning a cycle of the alternating current based on the charge ratio and coupling each partitioned portion of the alternating current to a different phase of the multi-phase AC line.
2. The apparatus of claim 1 , wherein the charge ratio indicates relative values of each phase of the reference waveform during a time window.
3. The apparatus of claim 2 , wherein the cycloconverter controller dynamically determines the charge ratio for each time window of a plurality of consecutive time windows.
4. The apparatus of claim 1 , wherein the reference waveform is synchronous with an AC voltage on the multi-phase AC line.
5. The apparatus of claim 1 , wherein the resonant circuit is a series resonant circuit comprising a leakage inductance of the transformer and a capacitor.
6. The apparatus of claim 1 , wherein selectively coupling the alternating current comprises deactivating a single switch on each output line of at least one output line.
7. A method for providing multi-phase power, comprising:
generating an alternating current via a resonant circuit coupled to a primary winding of a transformer;
coupling the alternating current to a cycloconverer coupled to a secondary winding of the transformer;
determining a charge ratio based on a reference waveform;
selectively coupling, by the cycloconverter, the alternating current to each line of a multi-phase AC line based on the charge ratio, wherein the alternating current is a sinusoidally shaped single-phase waveform;
wherein selectively coupling the alternating current comprises partitioning a cycle of the alternating current based on the charge ratio and coupling each partitioned portion of the alternating current to a different phase of the multi-phase AC line.
8. The method of claim 7 , wherein the charge ratio indicates relative values of each phase of the reference waveform during a time window.
9. The method of claim 8 , wherein the charge ratio is dynamically determined for each time window of a plurality of consecutive time windows.
10. The method of claim 7 , further comprising generating the reference waveform synchronous with an AC voltage on the multi-phase AC line.
11. The method of claim 7 , wherein the resonant circuit is a series resonant circuit comprising a leakage inductance of the transformer and a capacitor.
12. The method of claim 7 , wherein selectively coupling the alternating current comprises deactivating a single switch on each output line of at least one output line.
13. A system for providing multi-phase power, comprising:
a photovoltaic (PV) module; and a resonant converter, coupled to the PV module and to a multi-phase AC line, comprising:
a transformer comprising a primary winding and a secondary winding;
a resonant circuit coupled to the primary winding;
a cycloconverter controller for determining a charge ratio based on a reference waveform;
a cycloconverter, coupled to the cycloconverter controller and to the multi-phase AC line, for selectively coupling an alternating current to each line of the multi-phase AC line based on the charge ratio, wherein the alternating current results from the resonant circuit and is a sinusoidally shaped single-phase waveform;
wherein selectively coupling the alternating current comprises partitioning a cycle of the alternating current based on the charge ratio and coupling each partitioned portion of the alternating current to a different phase of the multi-phase AC line.
14. The system of claim 13 , wherein the charge ratio indicates relative values of each phase of the reference waveform during a time window.
15. The system of claim 13 , wherein the reference waveform is synchronous with an AC voltage on the multi-phase AC line.
16. The system of claim 13 , wherein the resonant circuit is a series resonant circuit comprising a leakage inductance of the transformer and a capacitor.
17. The system of claim 13 , wherein selectively coupling the alternating current comprises deactivating a single switch on at least one output line.