# US 12,191,678 B2 · Electronic apparatus, power supply system and power supply control method

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- Number: US 12,191,678 B2
- Document ID: US12191678B2
- Status: Granted
- Kind: B2
- Application number: 18/214,565
- Filed: 2023-06-27
- Published: 2023-10-26
- Granted: 2025-01-07
- Earliest claimed: 2020-03-18
- Assignees: Kabushiki Kaisha Toshiba
- Applicants: Kabushiki Kaisha Toshiba
- Inventors: Kentaro Taniguchi; Toshiya Mitomo
- Web page: https://patentgrep.com/patent/US12191678B2

## CPC

- H02J 50/20: using microwaves or radio frequency waves
- H02J 50/40: using two or more transmitting or receiving devices (H02J50/50 takes precedence)
- H02J 50/70: involving the reduction of electric, magnetic or electromagnetic leakage fields
- H04B 15/02: Reducing interference from electric apparatus by means located at or near the interfering apparatus
- H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA]
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H04B: TRANSMISSION
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A power supply system includes a first power supply apparatus configured to perform power transmission by an electromagnetic wave having a first frequency band, and a second power supply apparatus configured to perform power transmission by an electromagnetic wave having a second frequency band. The first power supply apparatus and the second power supply apparatus are provided so as to be 2H×{tan(θ)} or greater distant from each other, when each of the first power supply apparatus and the second power supply apparatus is provided in height H from a floor surface, where H is a positive number, and when a direction of a maximum value ±3 dB is in a range from −θ to +θ in a case where a perpendicular downward direction from each position is a standard.

## Claims

### Claim 1

A power supply system comprising:
a first power supply apparatus configured to perform power transmission by an electromagnetic wave having a first frequency band; and
a second power supply apparatus configured to perform power transmission by an electromagnetic wave having a second frequency band,
wherein:
each of the first power supply apparatus and the second power supply apparatus is provided at a height H from a floor surface, where H is a positive number,
the first power supply apparatus and the second power supply apparatus are provided so as to be separated from each other by a distance of at least 2H×{tan (θ)}, where θ is an angle between a perpendicular downward direction from one of the first power supply apparatus and the second power supply apparatus and a first direction, and
each of the first power supply apparatus and the second power supply apparatus is configured to perform the power transmission such that a maximum value of −3 dB is transmitted in the first direction.

### Claim 2 (depends on 1)

The power supply system of claim 1, wherein the first power supply apparatus and the second power supply apparatus are configured to:
perform carrier sense in a first period with a third frequency different from the first frequency and the second frequency;
perform the power transmission in a second period after the first period when no signal greater than a predetermined value is detected in the carrier sense of the first period; and
perform the carrier sense in a third period after the first period when a signal is detected in the carrier sense of the first period.

### Claim 3 (depends on 2)

The power supply system of claim 2, wherein a sum of a length of the third period and a length of the first period comprises a length of a period in which the carrier sense should be performed.