Converter and power receiving apparatus

Patent metadata

Field	Value
Publication number	US-10141789-B2
Application number	US-201615566331-A
Country	US
Kind code	B2
Filing date	Apr 13, 2016
Priority date	Apr 14, 2015
Publication date	Nov 27, 2018
Grant date	Nov 27, 2018

Abstract

An equivalent circuit of a converter (4) is represented by a series connection between an equivalent capacitor (41) and an equivalent resistor (42), and the converter (4) includes a controller that adjusts a power factor of the input power by controlling a capacitive reactance (Xc) of the equivalent capacitor (41).

First claim

The invention claimed is:

1. A converter for converting input power, the converter comprising:
a plurality of capacitors,
a plurality of resistors, and
a controller configured to adjust a power factor of the input power by controlling a capacitive reactance of an equivalent capacitor formed by combining the plurality of capacitors,
wherein the controller identifies the capacitive reactance that maximizes a resistance of an equivalent resistor formed by combining the plurality of resistors and connected to the equivalent capacitor in series in a state of constant output power.

2. A power receiving apparatus comprising:
the converter of claim 1 ; and
a secondary coil to be magnetically coupled to a primary coil and generate electric power,
wherein the secondary coil supplies the electric power to the converter as the input power.

3. The power receiving apparatus of claim 2 , further comprising a resonance capacitor connected in series between the secondary coil and the converter.

4. The converter of claim 1 , wherein the controller measures the resistance of the equivalent resistor each time the controller changes the capacitive reactance to identify the capacitive reactance that maximizes the resistance of the equivalent resistor.

5. A converter for converting input power, the converter comprising:
a plurality of capacitors,
a plurality of resistors, and
a controller configured to adjust a power factor of the input power by controlling a capacitive reactance of an equivalent capacitor formed by combining the plurality of capacitors,
wherein the controller identifies the capacitive reactance that minimizes a current passing through an equivalent resistor formed by combining the plurality of resistors and connected to the equivalent capacitor in series in a state of constant output power.

6. A power receiving apparatus comprising:
the converter of claim 5 ; and
a secondary coil to be magnetically coupled to a primary coil and generate electric power, wherein the secondary coil supplies the electric power to the converter as the input power.

7. The power receiving apparatus of claim 6 , further comprising a resonance capacitor connected in series between the secondary coil and the converter.

8. The converter of claim 5 , wherein the controller measures the current passing through the equivalent resistor each time the controller changes the capacitive reactance to identify the capacitive reactance that minimizes the current passing through the equivalent resistor.

Assignees

• Tokai Ryokaku Tetsudo Kk
• Toyo Electric Mfg Co Ltd

Inventors

• Kashiwagi Yuki
• Murai Toshiaki
• Hagiwara Yoshiyasu
• Sawada Tadashi
• Tanaka Takayoshi
• Kashima Takehisa

Classifications

• H02M7/043

  using transformers or inductors only · CPC title

• H02J50/12 Primary

  of the resonant type · CPC title

• H04B5/0093

  Electricity · mapped topic

• H04B5/0081

  Electricity · mapped topic

• H02M7/48

  using discharge tubes with control electrode or semiconductor devices with control electrode · CPC title