Integrated wireless power transfer system

Patent metadata

Field	Value
Publication number	US-10919401-B2
Application number	US-201715404853-A
Country	US
Kind code	B2
Filing date	Jan 12, 2017
Priority date	Jan 12, 2017
Publication date	Feb 16, 2021
Grant date	Feb 16, 2021

Abstract

A charging system includes an inverter configured to receive rectified mains line voltage and current to power a primary coil to induce charge current in a secondary coil of a vehicle. The charging system also includes a controller configured to alter a switching frequency of the inverter based on charge voltage data from the vehicle to cause the inverter to operate to drive a voltage of an energy storage capacitor of a battery charger of the vehicle toward a constant value.

First claim

What is claimed is:

1. A charging system comprising:
an inverter configured to receive rectified mains line voltage and current to power a primary coil to induce charge current in an integrated wireless charger of a vehicle; and
a controller configured to alter a switching frequency of the inverter based on charge voltage data of an energy storage capacitor of an on-board battery charger of the vehicle to cause the inverter to operate to drive a voltage of the energy storage capacitor toward a constant value, the energy storage capacitor being connected between a power factor correction circuit of the vehicle and an inverter of the vehicle.

2. The system of claim 1 , wherein the altering of the switching frequency further causes the inverter to operate to drive a rectified mains input current phase toward a rectified mains line voltage phase.

3. The system of claim 1 , wherein the controller is further configured to alter a phase shift angle of the inverter to limit the altering of the switching frequency to a specified band of frequencies.

4. The system of claim 3 , wherein the altering of the phase shift angle is based on one of a primary coil inductance, a secondary coil inductance, and a coupling coefficient between the primary and secondary coils.

5. The system of claim 3 , wherein the inverter includes two master switches configured to open and close responsive to a command by the controller, and wherein the altering of the phase shift angle includes altering a period of time between issuing consecutive close commands to the master switches.

6. The system of claim 1 , wherein the inverter includes two master switches configured to open and close responsive to a command by the controller, and wherein the altering of the switching frequency includes, subsequent to issuing a command to open one switch, issuing a command to close another switch responsive to the voltage across the switch commanded open being less than a predefined threshold.

7. The system of claim 1 , wherein the inverter includes two master switches configured to open and close responsive to a command by the controller, and wherein the altering of the frequency includes, subsequent to issuing a command to close one switch, issuing a command to open another switch responsive to current at the switch commanded closed being less than a predefined threshold.

8. A method for a vehicle comprising:
by a controller, altering a switching frequency of an off-board inverter based on charge voltage data of an energy storage capacitor of an on-board battery charger of the vehicle to cause the off-board inverter to operate to drive a voltage of the energy storage capacitor toward a constant value, wherein the energy storage capacitor is connected between a power factor correction circuit of the vehicle and an inverter of the vehicle, and wherein the off-board inverter is configured to receive rectified mains line voltage and current to power a primary coil to induce charge current in an integrated wireless charger of the vehicle.

9. The method of claim 8 , wherein the altering of switching frequency further causes the off-board inverter to operate to drive an input current phase of the off-board inverter toward a rectified mains line voltage phase.

10. The method of claim 8 further comprising altering a phase shift angle of the off-board inverter to limit the altering of the switching frequency to a specified band of frequencies.

11. The method of claim 10 , wherein the altering of the phase shift angle is based on one of a primary coil inductance, a secondary coil inductance, and a coupling coefficient between the primary and secondary coils.

12. The method of claim 10 , wherein the off-board inverter includes two master switches configured to open and close responsive to a command by the controller, and wherein the altering of the phase shift angle includes altering a period of time between issuing consecutive close commands to the master switches.

13. The method of claim 8 , wherein the off-board inverter includes two master switches configured to open and close responsive to a command by the controller, and wherein the altering of the switching frequency includes, subsequent to issuing a command to open one switch, issuing a command to close another switch responsive to the voltage across the switch commanded open falling below a predefined threshold.

14. The method of claim 8 , wherein the off-board inverter includes two master switches configured to open and close responsive to a command by the controller, and wherein the altering of the switching frequency includes, subsequent to issuing a command to close one switch, issuing a command to open another switch responsive to current at the switch commanded close falling below a predefined threshold.

Assignees

• Ford Global Tech Llc

Inventors

• Elshaer Mohamed
• Chen Chingchi
• Ferrel Mark J
• Gibeau John Paul

Classifications

• H02J2105/37

  exchanging power with electric vehicles [EV] or with hybrid electric vehicles [HEV] · CPC title

• H02J7/42

  with electronic devices having internal batteries, e.g. mobile phones · CPC title

• B60L53/12 Primary

  Inductive energy transfer · CPC title

• Y02T90/12

  Electric charging stations · CPC title

• B60L2210/40

  DC to AC converters · CPC title