Recharge systems and methods

Patent metadata

Field	Value
Publication number	US-10493976-B2
Application number	US-201715669374-A
Country	US
Kind code	B2
Filing date	Aug 4, 2017
Priority date	Dec 9, 2011
Publication date	Dec 3, 2019
Grant date	Dec 3, 2019

Abstract

A charging device according to an exemplary embodiment of the present invention may include: a battery adapted and configured to store a DC voltage, first and second motors adapted and configured to operate as a motor or a generator, first and second inverters adapted and configured to operate the first and second motors, a voltage transformer adapted and configured to boost the DC voltage of the battery to supply it to the first and second inverters and boosts the DC voltage of the inverter to supply it to the battery, and a charging controller adapted and configured to operate the first and second inverters as a booster or operate the voltage transformer as a buck booster according to a voltage that is input through a neutral point of the first and second motors and the voltage of the battery.

First claim

What is claimed is:

1. A charging device comprising;
a battery adapted and configured to store DC voltage;
first and second motors adapted and configured to operate as a motor or a generator;
first and second inverters adapted and configured to operate the first and second motors;
a voltage transformer adapted and configured to boost the DC voltage of the battery to supply it to the first and second inverters and repress the DC voltage of the inverter to supply it to the battery; and
a charging controller adapted and configured to operate the first and second inverters as a booster or operate the voltage transformer as a buck booster according to a voltage that is input through a neutral point of the first and second motors and the voltage of the battery,
wherein the charging controller switches the first and second inverters according to the input voltage of the neutral point such that the first and second inverters are boosters and continuously turns on an upper switching element of the voltage transformer, if the battery voltage exceeds the voltage that is input through the neutral point of the first and second motors.

2. The charging device of claim 1 , wherein the charging controller controls the first and second inverters to be turned off and controls the voltage transformer to be a buck booster, if the voltage that is input through the neutral point of the first and second motors exceeds a battery voltage.

3. The charging device of claim 2 , wherein the charging controller bypasses the voltage that is input through the neutral point of the first and second motors to the voltage transformer while the first and second inverters are turned off.

4. The charging device of claim 1 , wherein the charging controller controls such that the voltage transformer boosts voltage and performs DC voltage transformation to charge the battery, if the input voltage of the neutral point of the first and second motors exceeds a battery voltage.

5. The charging device of claim 1 , wherein the charging controller only uses the first and second inverters to perform voltage boosting and DC voltage transformation such that the boosted and DC transformed voltage is supplied to the battery as a charging voltage, if the input voltage that is input through the neutral point of the first and second motors is less than the battery voltage.

6. The charging device of claim 1 , wherein the charging controller cuts off the voltage that is input to the neutral point of the first and second motors, if it is determined that the battery is fully charged.

7. The charging device of claim 1 , wherein the charging controller operates the first inverter as a booster, if the battery voltage exceeds the input voltage of the neutral point of the first and second motors and the phase of the input voltage has a positive value(V in >0).

8. The charging device of claim 1 , wherein the charging controller operates the second inverter as a booster, if the battery voltage exceeds the input voltage of the neutral point of the first and second motors and the phase of the input voltage has a negative value (V in <0).

9. A charging method comprising:
detecting a connection of a charging plug;
detecting a voltage that is input through a neutral point of first and second motors and a voltage of a battery, if the connection of the charging plug is detected; and
charging a battery by operating first and second inverters as boosters or operating a voltage transformer as a buck booster depending on a relation between a voltage input through the neutral point of the first and second motors and a battery voltage,
wherein the input voltage is repressed only by the voltage transformer to charge the battery, if the voltage input through the neutral point of the first and second motors exceeds the battery voltage, and
wherein the first and second inverters maintains a turned-off condition and the voltage input through the neutral point of the first and second motors is bypassed to the voltage transformer, if the voltage input through the neutral point of the first and second motors exceeds the battery voltage.

10. The charging method of claim 9 , wherein the input voltage is boosted only by the first and second inverters to charge the battery, if the voltage input through the neutral point of the first and second motors is less than the battery voltage.

11. The charging method of claim 10 , wherein the first and second inverters are switched depending on the phase of the input voltage such that the first and second inverters are operated as boosters and an upper switching element of the voltage transformer is controlled to be continuously turned on, if the voltage input through the neutral point of the first and second motors is less than the battery voltage.

12. The charging method of claim 11 , wherein in a condition that the voltage input through the neutral point of the first and second motors is less than the battery voltage, if the phase of the input voltage is a positive value (V in >0), the first inverter is operated as a booster, and if the phase of the input voltage is a negative value (V in <0), the second inverter is operated as a booster.

13. A charging method comprising:
detecting a connection of a charging plug;
detecting a voltage that is input through a neutral point of first and second motors and a voltage of a battery, if the connection of the charging plug is detected;
charging a battery by boosting the input voltage through a voltage transformer, if the voltage input through the neutral point of the first and second motors exceeds the battery voltage; and
charging a battery by boosting the input voltage through first and second inverters depending on the input voltage, if the voltage input through the neutral point of the first and second motors is less than the battery voltage,
wherein when the first and second inverters boost the input voltage, an upper switching element of the voltage transformer is controlled to be continuously turned on such that a switching loss of the voltage transformer does not occur.

14. The charging method of claim 13 , wherein the first and second inverters are maintained in a turned-off condition such that a switching loss does not occur while the input voltage is boosted by the voltage transformer.

15. The charging method of claim 13 , wherein when the voltage input through the neutral point of the first and second motors is less than the battery voltage, if the phase of the input voltage is a positive value (V in >0), the first inverter is controlled to boost the input voltage, and if the phase of the input voltage is a negative value (V in <0), the second inverter is controlled to boost the input voltage.

16. A charging method comprising:
detecting a connection of a charging plug;
detecting a voltage that is input through a neutral point of first and second motors and a voltage of a battery, if the connection of the charging plug is detected;
boosting an input voltage by operating a first inverter or a second inverter as a booster depending on a phase of the voltage input through the neutral point of the first and second motors; and
charging a battery by operating a voltage transformer as a buck booster or to maintain its switching off condition depending on a relation between the voltage input through the neutral point of the first and second motors and the battery voltage.

17. The charging method of claim 16 , wherein if the voltage input through the neutral point of the first and second motors is a positive value (V in >0), the first inverter is operated as a booster, and

Assignees

• Hyundai Motor Co Ltd
• Research & Business Found Sungkyunkwan Univ
• Kia Motors Corp
• Hyndai Motor Company

Inventors

• Lim Seong Yeop
• Kang Gu Bae
• Yim Jeongbin
• Min Byungsoon
• Lee Byoung-Kuk
• Shin Seung-Min
• Kim Dong-Hee
• Woo Dong-Gyun

Classifications

• H02M7/68

  by static converters · CPC title

• B60L53/22

  Constructional details or arrangements of charging converters specially adapted for charging electric vehicles · CPC title

• B60L15/007

  Physical arrangements or structures of drive train converters specially adapted for the propulsion motors of electric vehicles · CPC title

• B60W20/13

  in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion · CPC title

• B60L50/16

  with provision for separate direct mechanical propulsion · CPC title