US 12,074,450 B2
Wireless electrical transfer with zero voltage switching power supply apparatus
Hideki Omori, Osaka (JP); Masahito Tsuno, Kyoto (JP); and Masashi Yamaguchi, Kyoto (JP)
Assigned to Nichicon Corporation, Kyoto (JP); and Josho Gakuen Educational Foundation, Osaka (JP)
Filed by Nichicon Corporation, Kyoto (JP); and JOSHO GAKUEN EDUCATIONAL FOUNDATION, Osaka (JP)
Filed on Nov. 9, 2022, as Appl. No. 17/983,956.
Application 17/983,956 is a continuation of application No. 17/290,635, granted, now 11,527,915, previously published as PCT/JP2019/043033, filed on Nov. 1, 2019.
Claims priority of application No. 2018-207094 (JP), filed on Nov. 2, 2018; application No. 2019-149449 (JP), filed on Aug. 16, 2019; and application No. 2019-183023 (JP), filed on Oct. 3, 2019.
Prior Publication US 2023/0067135 A1, Mar. 2, 2023
Int. Cl. H02J 50/10 (2016.01); H02J 50/12 (2016.01); H02J 50/40 (2016.01); H02J 50/80 (2016.01)
CPC H02J 50/12 (2016.02) [H02J 50/402 (2020.01); H02J 50/80 (2016.02)] 9 Claims
OG exemplary drawing
 
1. A wireless electrical power supply apparatus comprising:
a first electrical power supply unit connected to a first DC power source;
a second electrical power supply unit connected to a second DC power source; and
a control portion configured to control the first electrical power supply unit and the second electrical power supply unit, wherein,
the first electrical power supply unit and the second electrical power supply unit transmit power to each other,
the first electrical power supply unit includes:
a first transmission coil;
a first switching device connected in series to the first transmission coil; and
a first resonant capacitor connected in parallel to either the first transmission coil or the first switching device, or both,
the second electrical power supply unit includes:
a second transmission coil;
a second switching device connected in series to the second transmission coil; and
a second resonant capacitor connected in parallel to either the second transmission coil or the second switching device, or both, and
the control portion includes:
a first turn-on control circuit configured to control turn-on of the first switching device in synchronization with a resonant voltage induced by the first transmission coil and the first resonant capacitor such that the first switching device performs a zero-voltage switching operation;
a second turn-on control circuit configured to control turn-on of the second switching device in synchronization with a resonant voltage induced by the second transmission coil and the second resonant capacitor such that the second switching device performs a zero-voltage switching operation; and
a cross-phase shift control circuit configured to perform control to cause a predetermined phase difference between turn-off of the first switching device and turn-off of the second switching device, wherein,
the cross-phase shift control circuit is configured to control a turn-off timing of the second switching device according to a difference between a transmission power from the first electrical power supply unit to the second electrical power supply unit and a target power value during power transmission from the first electrical power supply unit to the second electrical power supply unit and to control the transmission power without changing a conductive time of the first switching device.