Coil alignment control method and apparatus for the wireless charging of vehicles

Patent metadata

Field	Value
Publication number	US-2023155427-A1
Application number	US-202217988084-A
Country	US
Kind code	A1
Filing date	Nov 16, 2022
Priority date	Nov 17, 2021
Publication date	May 18, 2023
Grant date	—

Abstract

The present disclosure in some embodiments provides a coil alignment control method and a coil alignment control apparatus for the wireless charging of a mobile object, which perform a parallel alignment for aligning a power reception-side surface of a power reception coil of the mobile object to be parallel to a power transmission-side surface of a power transmission coil on a wireless-charging power transmission coil panel, perform a center alignment for the power reception coil and the power transmission coil to have central winding areas that are in alignment, and perform a proximity alignment for aligning the power reception coil to be in proximity to the power transmission coil by a preset proximity distance, thereby maximizing the wireless power transfer efficiency.

First claim

What is claimed is:

1 . A coil alignment control apparatus for wirelessly charging a mobile object from a wireless-charging power transmission station, the apparatus comprising:
the wireless-charging power transmission station comprising:
a plurality of power transmission coil panels each including a power transmission coil and a power-transmitter infrared transceiver unit,
a power-transmission-coil selection switch configured to select any one of the plurality of power transmission coil panels, and
a power transmitter circuit and control module configured to control power transmission using a selected power transmission coil panel that is selected through the power-transmission-coil selection switch, and
the mobile object comprising:
a power reception coil panel including a first power-receiver infrared transceiver unit, a second power-receiver infrared transceiver unit, and a power reception coil,
a mobile-object maneuver controller configured to control maneuver of the mobile object for coil alignment, and
a power receiver circuit and control module configured to make the first power-receiver infrared transceiver unit and the second power-receiver infrared transceiver unit to each receive infrared rays emitted from the power-transmitter infrared transceiver unit of a selected power transmission coil panel and measure infrared reception power densities, respectively, to generate respective measured infrared reception power densities, and to control maneuver of the mobile object through the mobile-object maneuver controller so that the respective measured infrared reception power densities become equal to align a central winding area of the power reception coil with a central winding area of the power transmission coil on the selected power transmission coil panel,
wherein the first power-receiver infrared transceiver unit and the second power-receiver infrared transceiver unit are installed at a distance from each other.

2 . The coil alignment control apparatus of claim 1 , wherein the power transmission coil panels each have a different height, and any one power transmission coil panel corresponding to a height of the power reception coil of the mobile object is selected to perform a power transmission.

3 . The coil alignment control apparatus of claim 1 , wherein the power receiver circuit and control module is configured
to measure distances from the first power-receiver infrared transceiver unit and the second power-receiver infrared transceiver unit to a power transmission-side surface of the selected power transmission coil panel to generate respective measured distances, and to control the maneuver of the mobile object through the mobile-object maneuver controller so that the respective measured distances become equal to further align a power reception-side surface of the power reception coil to be parallel to the power transmission-side surface.

4 . The coil alignment control apparatus of claim 1 , wherein the power receiver circuit and control module is configured
to measure distances from the first power-receiver infrared transceiver unit and the second power-receiver infrared transceiver unit to a power transmission-side surface of the selected power transmission coil panel to generate respective measured distances, and to control the maneuver of the mobile object through the mobile-object maneuver controller so that the respective measured distances are equal to each other and all become a set reference value to further align the power reception coil to be in close proximity to the power transmission coil on the selected power transmission coil panel.

5 . A coil alignment control method for wirelessly charging a mobile object from a wireless-charging power transmission station, the method comprising:
selecting, from a plurality of power transmission coil panels belonging to the wireless-charging power transmission station and each having different heights, a power transmission coil panel corresponding to a height of a power reception coil of the mobile object, as a selected power transmission coil panel; performing a parallel alignment for aligning a power reception-side surface of the power reception coil to be parallel to a power transmission-side surface of a power transmission coil on the selected power transmission coil panel; performing a center alignment for a central winding area of the power reception coil and a central winding area of the power transmission coil to align; and performing a proximity alignment for aligning the power reception coil to be in close proximity to the power transmission coil, wherein the performing of the center alignment comprises:
measuring infrared reception power densities of infrared rays emitted by a power-transmitter infrared transceiver unit of the selected power transmission coil panel and received by each of the first power-receiver infrared transceiver unit of the mobile object and a second power-receiver infrared transceiver unit of the mobile object to generate respective measured infrared reception power densities, and
controlling the maneuver of the mobile object through a mobile-object maneuver controller provided in the mobile object so that the respective measured infrared reception power densities become equal.

6 . The coil alignment control method of claim 5 , wherein the performing of the parallel alignment comprises:
measuring distances from the first power-receiver infrared transceiver unit and the second power-receiver infrared transceiver unit to a power transmission-side surface of the selected power transmission coil panel to generate respective measured distances; and controlling the maneuver of the mobile object through the mobile-object maneuver controller so that the respective measured distances become equal.

7 . The coil alignment control method of claim 5 , wherein the performing of the proximity alignment comprises:
measuring distances from the first power-receiver infrared transceiver unit and the second power-receiver infrared transceiver unit to a power transmission-side surface of the selected power transmission coil panel to generate respective measured distances; and controlling the maneuver of the mobile object through the mobile-object maneuver controller so that the respective measured distances become equal to each other and all become a set reference value.

8 . A coil alignment control apparatus for wirelessly charging a mobile object from a wireless-charging power transmission station, the apparatus comprising:
the wireless-charging power transmission station comprising:
a power transmission coil panel including a power transmission coil and a power-transmitter infrared transceiver unit, and
a power transmitter circuit and control module configured to control power transmission using the power transmission coil panel, and
the mobile object comprising:
a power reception coil panel including a first power-receiver infrared transceiver unit, a second power-receiver infrared transceiver unit, and a power reception coil,
a mobile-object maneuver controller configured to control maneuver of the mobile object for coil alignment, and
a power receiver circuit and control module configured to make the first power-receiver infrared transceiver unit and the second power-receiver infrared transceiver unit to receive infrared rays emitted from the power-transmitter infrared transceiver unit of the power transmission coil panel and measure infrared reception power densities, respectively, to generate respective measured infrared reception power densities, and to control maneuver of the mobile object through the mobile-object maneuver controller so that the respective measured infrared reception power densities become equal to a

Assignees

• Nat Univ Chungbuk Ind Acad Coop Found

Inventors

• Ahn Bierngchearl

Classifications

• Y02T90/12

  Electric charging stations · CPC title

• Y02T90/14

  Plug-in electric vehicles · CPC title

• Y02T10/7072

  Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors · CPC title

• Y02T10/70

  Energy storage systems for electromobility, e.g. batteries · CPC title

• H02J50/90 Primary

  involving detection or optimisation of position, e.g. alignment · CPC title