US 11,967,836 B2
Harmonic current monitoring in a wireless power system
Aiguo Patrick Hu, Auckland (NZ); Bo Long, Auckland (NZ); Qi Zhu, Auckland (NZ); Wynand Malan, Auckland (NZ); Patrin Illenberger, Auckland (NZ); and Andrew R Connell, Auckland (NZ)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Aug. 8, 2022, as Appl. No. 17/883,372.
Claims priority of provisional application 63/241,391, filed on Sep. 7, 2021.
Prior Publication US 2023/0072541 A1, Mar. 9, 2023
Int. Cl. H02J 50/60 (2016.01); H02J 50/12 (2016.01)
CPC H02J 50/60 (2016.02) [H02J 50/12 (2016.02)] 20 Claims
OG exemplary drawing
 
1. A wireless power system comprising:
a wireless power transmitting device comprising:
a power transmitting coil that is configured to transmit wireless power signals;
inverter circuitry coupled to the power transmitting coil; and
a parallel LC tank circuit and a capacitor connected to the power transmitting coil that tune the power transmitting coil to a fundamental frequency and a harmonic frequency; and
a wireless power receiving device comprising:
a power receiving coil that is configured to receive the wireless power signals, wherein the power receiving coil is tuned to the fundamental frequency; and
a notch filter coupled to the power receiving coil that filters out the harmonic frequency.