Electronic unit and feed system

• US 10,027,176 B2
• Filed: 08/08/2016
• Issued: 07/17/2018
• Est. Priority Date: 04/08/2013
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Nakano, Hiroaki, Terashima, Toru, Bunsen, Keigo, Fukuda, Shinichi
• Primary Examiner(s): TSO, EDWARD H
• Application Number:
  US15/230,878
• Publication Number:
  US 20160344239A1
• Time in Patent Office: 708 Days
• Field of Search: 320106, 320108, 320128, 320140
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/40 using two or more transmitting or receiving devices H02J50/50 takes precedence
• 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
• CPC Class Codes: H02J 7/00045 Authentication, i.e. circuits for checking compatibility between one component, e.g. a battery or a battery charger, and another component, e.g. a power source
• CPC Class Codes: H02J 7/00308 Overvoltage protection

Abstract

An electronic unit includes: a power receiving section configured to receive electric power fed from a feed unit by using a magnetic field; and a control section configured to perform, when a receiving current supplied from the power receiving section is less than a predetermined threshold current at a time of a light load, current increasing control to increase the receiving current to the threshold current or more.

Claims

1. An electronic unit comprising:

power receiving circuitry configured to generate an electric current from a magnetic field after wirelessly receiving the magnetic field from a feed unit; and

control circuitry configured to perform;

a first load control that increases the electric current to a first load current after a rectification of the electric current by a rectification circuit, and

a second load control that increases the electric current to a second load current after the rectification of the electric current by the rectification circuit,

wherein the second load current is larger than the first load current.

2. The electronic unit according to claim 1, wherein the control circuitry is configured to disconnect the first load control and the second load control from a point in a supply path when a main load is set.

3. The electronic unit according to claim 1, wherein control circuitry is configured to perform the first load control or the second load control during a first phase.

4. The electronic unit according to claim 1, wherein during a first phase, either mutual authentication between the electronic unit and the feed unit or feeding efficiency control is performed.

5. The electronic unit according to claim 4, wherein during the first phase, the control circuitry is configured to perform either the first load control or the second load control.

6. The electronic unit according to claim 5, wherein a feeding is performed in a second phase, the second phase occurs after the first phase.

7. The electronic unit according to claim 6, wherein the control circuitry is configured to disconnect the first load control and the second load control from a point in a supply path when a main load is set.

8. An electronic unit comprising:

power receiving circuitry configured to generate an electric current from a magnetic field after wirelessly receiving the magnetic field from a feed unit; and

control circuitry configured to perform;

a first resistance control that decreases a first resistance to a ground after a rectification of the electric current by a rectification circuit, and

a second resistance control that decreases a second resistance to the ground after the rectification of the electric current by the rectification circuit,

wherein the second resistance is smaller than the first load current.

9. The electronic unit according to claim 8, wherein the control circuitry is configured to disconnect the first resistance control and the second resistance control from a point in a supply path when a main load is set.

10. The electronic unit according to claim 8, wherein control circuitry is configured to perform the first resistance control or the second resistance control during a first phase.

11. The electronic unit according to claim 8, wherein during a first phase, either mutual authentication between the electronic unit and the feed unit or feeding efficiency control is performed.

12. The electronic unit according to claim 11, wherein during a first phase, the control circuitry is configured to perform either the first resistance control or the second resistance control.

13. The electronic unit according to claim 12, wherein a feeding is performed in a second phase, the second phase occurs after the first phase.