US 12,243,677 B2
Electrical power transformer and electrical power transformation system
Matthew Williams, Edinburgh (GB); and Seyed Ali Mousavi, Edinburgh (GB)
Assigned to IONATE LIMITED, Edinburgh (GB)
Appl. No. 18/832,753
Filed by IONATE LIMITED, Edinburgh (GB)
PCT Filed Jan. 25, 2023, PCT No. PCT/EP2023/051784
§ 371(c)(1), (2) Date Jul. 24, 2024,
PCT Pub. No. WO2023/144194, PCT Pub. Date Aug. 3, 2023.
Claims priority of application No. 2200944 (GB), filed on Jan. 25, 2022.
Prior Publication US 2024/0420886 A1, Dec. 19, 2024
Int. Cl. H01F 30/04 (2006.01); H01F 3/10 (2006.01); H01F 30/12 (2006.01); H02M 1/00 (2007.01); H02M 1/42 (2007.01); H02M 5/10 (2006.01)
CPC H01F 30/04 (2013.01) [H01F 3/10 (2013.01); H01F 30/12 (2013.01); H02M 1/0006 (2021.05); H02M 1/4216 (2013.01); H02M 5/10 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A three phase transformer apparatus for a three phase electrical power transformation system, wherein
for each phase of the three phase transformer apparatus the three phase transformer apparatus comprises:
an upper core limb having a first end and a second end;
a lower core limb having a third end and a fourth end;
a first coil assembly comprising a first primary coil and a first secondary coil,
wherein the first primary coil and the first secondary coil of each first coil assembly are wound concentrically around one of the upper core limb or the lower core limb of the respective phase; and
a second coil assembly comprising a second secondary coil and a control coil,
wherein the second secondary coil and the control coil of each second coil assembly are wound concentrically around the other of the upper core limb and the lower core limb of the respective phase;
wherein the second secondary coil of each second coil assembly is connected in series to the first secondary coil of the first coil assembly of the respective phase,
the three phase transformer apparatus further comprising:
a first yoke portion connected between each of the first ends of the upper core limbs;
a second yoke portion connected between each of the fourth ends of the lower core limbs;
at least one transfer yoke, configured to allow magnetic flux to flow between the first end of each upper core limb and the second end of the respective upper core limb, and to allow magnetic flux to flow between the third end of each lower core limb and the fourth end of the respective lower core limb,
a controller connected to the control coil of each phase and configured to apply a voltage or current waveform to the control coil in order to influence the transfer of energy between the first primary coils and the first and second secondary coils of the three phase transformer apparatus,
wherein the controller comprises:
a voltage control circuit connected to the control coil of each of phase and configured to apply a voltage waveform or a current waveform to the control coil of each phase to control a voltage across the first secondary coil and the second secondary coil of each of the phases to control harmonics; and
a power factor control circuit configured to control a power factor of the three phase transformer apparatus
wherein the power factor control circuit of the controller is configured to draw power from the secondary side of the three phase transformer apparatus and to output power to the voltage control circuit via a dc link, wherein the controller is electrically isolated from the primary side of the three phase transformer apparatus.