# US 2019/0356170 A1 · Resonance-type power reception device

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- Number: US 2019/0356170 A1
- Document ID: US20190356170A1
- Status: Published application
- Kind: A1
- Application number: 16/483,248
- Filed: 2017-03-10
- Published: 2019-11-21
- Earliest claimed: 2017-03-10
- Assignees: Mitsubishi Electric Engineering Company Limited
- Applicants: Mitsubishi Electric Engineering Company, Limited
- Inventors: Yoshiyuki AKUZAWA; Hiroshi MATSUMORI
- Web page: https://patentgrep.com/patent/US20190356170A1

## CPC

- H02J 50/12: of the resonant type
- H02J 50/70: involving the reduction of electric, magnetic or electromagnetic leakage fields
- H02J 50/10: using inductive coupling
- H02J 50/20: using microwaves or radio frequency waves
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY

## Abstract

A receiving antenna (3) receiving power transferred from a transmitting antenna (2) is provided. Further, a receiving circuit (4) controlling an input impedance in accordance with mutual inductance between the transmitting antenna and the receiving antenna is provided.

## Claims

### Claim 1

A resonance-type power reception device comprising:
a receiving antenna receiving power transferred from a transmitting antenna; and
a receiving circuit controlling an input impedance in accordance with mutual inductance between the transmitting antenna and the receiving antenna.

### Claim 2 (depends on 1)

The resonance-type power reception device according to claim 1, wherein
the receiving circuit includes:
a rectifier circuit conversing the power received by the receiving antenna into direct current power; and
an interface power supply controlling a ratio between a voltage and a current of the direct current power obtained by the rectifier circuit to a value proportional to a square of the mutual inductance.

### Claim 3 (depends on 2)

The resonance-type power reception device according to claim 2, wherein the interface power supply indirectly detects a change in the mutual inductance from a change in the voltage of the direct current power.

### Claim 4 (depends on 1)

The resonance-type power reception device according to claim 1, further comprising a matching circuit disposed between the receiving antenna and the receiving circuit and compensating for an imaginary part component of an input impedance of the transmitting antenna.

### Claim 5 (depends on 4)

The resonance-type power reception device according to claim 4, wherein the matching circuit includes at least one of an inductor and a capacitor.

### Claim 6 (depends on 1)

The resonance-type power reception device according to claim 1, wherein the receiving antenna performs power transfer with the transmitting antenna by magnetic field resonance, electric field resonance, or electromagnetic induction.