DETECTING DEVICE, POWER RECEIVING DEVICE, CONTACTLESS POWER TRANSMISSION SYSTEM, AND DETECTING METHOD

• US 20180198324A1
• Filed: 03/05/2018
• Published: 07/12/2018
• Est. Priority Date: 11/30/2011
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Bunsen, Keigo, Nakano, Hiroaki, Murakami, Tomomichi, Fukuda, Shinichi
• Granted Patent: US 11,303,161 B2
• Time in Patent Office: Days
• CPC Class Codes: G01R 27/04 in circuits having distributed constants , e.g. having very long conductors or involving high frequencies
• CPC Class Codes: G01V 3/02 operating with propagation of electric current
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices

Abstract

Disclosed herein is a detecting device including a coil electromagnetically coupled to the external, a resonant circuit that includes at least the coil, and a detecting section that superimposes a measurement signal for measuring the Q-factor of the resonant circuit on a power transmission signal transmitted to the coil in a contactless manner and removes the power transmission signal from an alternating-current signal obtained by superimposing the measurement signal on the power transmission signal. The detecting section measures the Q-factor by using the alternating-current signal from which the power transmission signal is removed.

Claims

1. A power receiving device, comprising:

resonance circuitry configured to receive a power transmission signal and including a first coil configured to electromagnetically couple to an external power transmitting device;

a memory configured to store a reference value;

control circuitry configured to retrieve the reference value from the memory;

a charge section configured to store a power obtained from the power transmission signal and to supply the power to the control circuitry; and

a separator configured to electrically separate a load from the resonance circuitry during a measurement of a Q-factor, the Q-factor being an index representing the relationship between retention and loss of energy in the resonance circuitry or a circuit of the external power transmitting device that includes a second coil.