Power receiving device

Patent metadata

Field	Value
Publication number	US-12107438-B2
Application number	US-202318172474-A
Country	US
Kind code	B2
Filing date	Feb 22, 2023
Priority date	Mar 2, 2022
Publication date	Oct 1, 2024
Grant date	Oct 1, 2024

Abstract

A power receiving device includes a power receiving antenna, a rectifier circuit, and a bias circuit. The power receiving antenna is configured to receive radio waves for supplying power. The rectifier circuit includes a rectifier diode and is configured to convert radio waves received by the power receiving antenna into a DC power. The bias circuit is configured to apply a DC bias to the rectifier diode.

First claim

What is claimed is:

1. A power receiving device used in radio wave wireless power supply, the power receiving device comprising:
a power receiving antenna that is configured to receive radio waves for supplying power;
a rectifier circuit that includes a rectifier diode and is configured to convert radio waves received by the power receiving antenna into a DC power; and
a bias circuit that is configured to apply a DC bias to the rectifier diode, wherein:
the bias circuit includes a voltage dividing resistance circuit that includes a first resistor and a second resistor,
the first resistor connects a power source of the rectifier circuit and an anode of the rectifier diode to each other, and
the second resistor connects a ground of the rectifier circuit and the anode of the rectifier diode to each other.

2. The power receiving device according to claim 1 , further comprising
processing circuitry, wherein
the processing circuitry is configured to
determine that the power receiving antenna is in a state of receiving the radio waves; and
switch a manner in which the DC bias is applied to the rectifier diode such that, when determining that the power receiving antenna is in the state of receiving the radio waves, the DC bias is applied to the rectifier diode, and that, when determining that the power receiving antenna is not in the state of receiving the radio waves, the DC bias is not applied to the rectifier diode.

3. The power receiving device according to claim 1 , wherein at least one of the first resistor and the second resistor is a thermistor.

4. A power receiving device used in radio wave wireless power supply, the power receiving device comprising:
a power receiving antenna that is configured to receive radio waves for supplying power;
a rectifier circuit that includes a rectifier diode and is configured to convert radio waves received by the power receiving antenna into a DC power;
a bias circuit that is configured to apply a DC bias to the rectifier diode;
a detecting unit that is configured to detect a temperature index value of the rectifier diode; and
processing circuitry configured to set the DC bias based on the temperature index value detected by the detecting unit.

Assignees

• Toyoda Gosei Kk

Inventors

• Seki Hideki
• Fuki Shinichiro
• Yamakoshi Teppei

Classifications

• H02J7/975

  in response to temperature · CPC title

• H02J2207/20

  Charging or discharging characterised by the power electronics converter · CPC title

• H02J50/27 Primary

  characterised by the type of receiving antennas, e.g. rectennas · CPC title

• H02J50/20 Primary

  using microwaves or radio frequency waves · CPC title

• H02J7/007192

  Electricity · mapped topic