WIRELESS POWER SUPPLY APPARATUS

• US 20150280451A1
• Filed: 03/27/2015
• Published: 10/01/2015
• Est. Priority Date: 03/28/2014
• Status: Active Grant

• Current Assignee: DENSO Corporation, Denso PS Corporation (DENSO Corporation)
• Original Assignee: DENSO Corporation, Denso PS Corporation (DENSO Corporation), Nippon Soken, Inc.
• Inventors: TAKEDA, Shigeru, SUGINO, Masayoshi, KONDO, Hiroshi
• Granted Patent: US 10,404,104 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02J 50/12 of the resonant type

Abstract

In a wireless power supply apparatus, a first unit electrically connected to a power supply and a second unit electrically connected to an electric load. Power transmission is performed wirelessly between the first and second units using a magnetic resonance phenomenon. Each of the units has a resonant amplifier circuit provided with switching means driven by a drive signal, a resonant coil to which a high-frequency signal generated by the resonant amplifier circuit is supplied such that the resonant coil functions as a resonant inductor on the resonant amplifier circuit, and electric storage means electrically connected to the resonant amplifier circuit so as to be capable of charging and discharging power. The second unit includes current detecting means for detecting a current flowing through the storage means, and phase control means for controlling a phase of the drive signal for the switching means based on the detected current.

Claims

1. A wireless power supply apparatus comprising:

a first unit electrically connected to a power supply; and

a second unit electrically connected to an electric load and performs power transmission wirelessly between the first and second units using a magnetic resonance phenomenon, wherein

the first unit and the second unit each have a resonant amplifier circuit provided with switching means driven by a drive signal, a resonant coil to which a high-frequency signal generated by the resonant amplifier circuit is supplied such that the resonant coil functions as a resonant inductor on the resonant amplifier circuit, and electric storage means electrically connected to the resonant amplifier circuit so as to be capable of charging and discharging power; and

the second unit includes

current detecting means for detecting a current flowing through the storage means, and

phase control means for controlling a phase of the drive signal for the switching means based on the current detected by the current detecting means.

2. The wireless power supply apparatus according to claim 1, wherein

the phase control means is configured to control the phase of the drive signal to the switching signal such that the power is transmitted bi-directionally from the first unit to the second unit and from the second unit to the first unit.