Charging system for eco-friendly vehicle and charge control method using the same

Patent metadata

Field	Value
Publication number	US-10923937-B2
Application number	US-201916593133-A
Country	US
Kind code	B2
Filing date	Oct 4, 2019
Priority date	Apr 22, 2019
Publication date	Feb 16, 2021
Grant date	Feb 16, 2021

Abstract

A charging system for an eco-friendly vehicle is provided. The system includes a power supply unit that provides power for charging an automotive battery and a charging unit including a motor and an inverter connected with the motor, and that charges the battery by being supplied with power from the power supply unit. One or more relays connect the power supply unit and the battery to each other and a controller moves a rotor of the motor to a predetermined reference position before charging the battery.

First claim

What is claimed is:

1. A charging system for an eco-friendly vehicle, comprising:
a power supply unit configured to provide power for charging an automotive battery;
a charging unit including a motor and an inverter connected with the motor, and configured to charge the battery by being supplied with power from the power supply unit;
one or more relays connecting the power supply unit and the battery to each other; and
a controller configured to move a rotor of the motor to a predetermined reference position before charging the battery.

2. The charging system of claim 1 , wherein the motor is a 3-phase motor and the predetermined reference position is a position at which inductances of phases of the motor are in equilibrium.

3. The charging system of claim 1 , further comprising:
a position detector configured to detect a position of the rotor of the motor; and
a storage configured to store reference position information of the rotor of the motor at which inductances of phases of the motor are in equilibrium.

4. The charging system of claim 3 , wherein the controller is configured to compare the position of the rotor detected by the position detector and the reference position stored in the storage, and when the detected position of the rotor and the reference position are different, move the rotor to the reference position by rotating the rotor by operating the inverter.

5. The charging system of claim 1 , wherein the relays include a first relay and a second relay disposed between the power supply unit and the battery, and a third relay disposed between the power supply unit and the charging unit.

6. The charging system of claim 5 , wherein the controller is configured to turn the relays on and off, and when the battery and the power supply unit have the same capacity, charge the battery by turning on the first relay and the second relay to supply power to the battery from the power supply unit.

7. The charging system of claim 5 , wherein the controller is configured to turn the relays on and off, and when a capacity of the power supply unit is less than a capacity of the battery, charge the battery by supplying power from the power supply unit to the battery after increasing voltage of the power by turning on the first relay and the third relay.

8. A charge control method using the charging system for an eco-friendly vehicle of claim 1 , comprising:
comparing, by a controller, a capacity of the power supply unit and a capacity of the battery;
moving, by the controller, the rotor of the motor to the predetermined reference position when the capacity of the power supply unit is less than the capacity of the battery;
turning, by the controller, the relays on and off; and
charging, by the controller, the battery by increasing a voltage of power supplied from the power supply unit and then supplying the power to the battery.

9. The method of claim 8 , wherein the motor is a 3-phase motor and is connected with the inverter, and the predetermined reference position is a position at which inductances of phases of the motor are in equilibrium.

10. The method of claim 8 , further comprising:
storing, by the controller, reference position information of the rotor of the motor such that inductance at phases of the motor is made equilibrium, before the comparing of a capacity of the power supply unit and a capacity of the battery.

11. The method of claim 8 , wherein the moving of the rotor of the motor to the predetermined reference position when the capacity of the power supply unit is less than the capacity of the battery includes:
detecting, by the controller, the position of the rotor of the motor when the capacity of the power supply unit is less than the capacity of the battery;
comparing, by the controller, the detected position of the rotor and the predetermined reference position; and
moving, by the controller, the rotor to the reference position by rotating the rotor by operating the inverter when the detected position of the rotor is different from the reference position.

12. The method of claim 8 , wherein, in turning the relays on and off, the first relay and the third relay are turned on and the second relay is turned off.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Lee Seong Min
• Lee Je Hwan
• Lee Ki Jong
• Shin Sang Cheol

Classifications

• B60L50/51 Primary

  characterised by AC-motors · CPC title

• H02J7/02

  for charging batteries from AC mains by converters · CPC title

• H02J2207/20

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

• H02P27/06

  using DC to AC converters or inverters (H02P27/05 takes precedence) · CPC title

• B60Y2200/91

  Electric vehicles · CPC title