US 12,113,366 B2
Resonant frequency compensation
Udaya Kumara Madawala, Stonefields (NZ); and Duleepa Jayanath Thrimawithana, Mt Wellington (NZ)
Assigned to AUCKLAND UNISERVICES LIMITED, Auckland (NZ)
Appl. No. 15/500,314
Filed by Auckland UniServices Limited, Auckland (NZ)
PCT Filed Aug. 11, 2015, PCT No. PCT/NZ2015/050105
§ 371(c)(1), (2) Date Jan. 30, 2017,
PCT Pub. No. WO2016/024868, PCT Pub. Date Feb. 18, 2016.
Claims priority of application No. 628544 (NZ), filed on Aug. 11, 2014.
Prior Publication US 2017/0222488 A1, Aug. 3, 2017
Int. Cl. H02J 50/12 (2016.01); H01F 38/14 (2006.01); H02J 7/00 (2006.01); H02M 3/335 (2006.01); H02M 3/337 (2006.01); H02J 50/60 (2016.01); H02J 50/90 (2016.01)
CPC H02J 50/12 (2016.02) [H01F 38/14 (2013.01); H02J 7/00712 (2020.01); H02M 3/33523 (2013.01); H02M 3/33576 (2013.01); H02M 3/3372 (2013.01); H02J 50/60 (2016.02); H02J 50/90 (2016.02); Y02B 70/10 (2013.01)] 38 Claims
OG exemplary drawing
 
1. A wireless power transfer apparatus suitable for magnetic coupling with a second apparatus, the wireless power transfer apparatus comprising:
a power converter electrically coupled or coupleable with a power source or load;
a resonant circuit electrically coupled with the power converter and comprising a magnetic coupler for magnetic coupling with the second apparatus; and
a controller associated with the power converter and configured to vary a relative phase of operation of the power converter with respect to the second apparatus, the phase being varied to at least partially compensate for variations in a reactive impedance,
wherein the wireless power transfer apparatus is configured to compensate for changes in the inductance of the magnetic coupler caused by misalignment of the magnetic coupler relative to the second apparatus.