Charge apparatus and electric vehicle including the same

Patent metadata

Field	Value
Publication number	US-9242567-B2
Application number	US-201313759169-A
Country	US
Kind code	B2
Filing date	Feb 5, 2013
Priority date	Feb 6, 2012
Publication date	Jan 26, 2016
Grant date	Jan 26, 2016

Abstract

A charging apparatus and an electric vehicle including the same are disclosed. The charging apparatus includes a rectifier to rectify input alternating current (AC) power in a charging mode, an interleaved buck-boost converter to convert the rectified power into direct current (DC) power to supply the converted DC power to a battery, the interleaved buck-boost converter including a plurality of buck-boost converters, and a converter controller to control the interleaved buck-boost converter, wherein a first buck-boost converter of the interleaved buck-boost converter includes a first buck switching element connected to the rectifier, a first boost switching element, an inductor connected between the first buck switching element and the first boost switching element, a first diode connected in parallel between the first buck switching element and the inductor, and a second diode connected between the first boost switching element and an output of the interleaved buck-boost converter.

First claim

What is claimed is:

1. A charging apparatus, comprising:
a rectifier to rectify input alternating current (AC) power in a charging mode;
an interleaved buck-boost converter to convert the rectified power into direct current (DC) power to supply the converted DC power to a battery, the interleaved buck-boost converter including a plurality of buck-boost converters; and
a converter controller to control the interleaved buck-boost converter,
wherein a first buck-boost converter of the interleaved buck-boost converter includes,
a first buck switching element connected to the rectifier,
a first boost switching element,
a first inductor connected between the first buck switching element and the first boost switching element,
a first diode connected in parallel between the first buck switching element and the first inductor, and
a second diode connected between the first boost switching element and an output of the interleaved buck-boost converter.

2. The charging apparatus according to claim 1 , wherein each of the plurality of buck-boost converters performs an interleaving operation, and a turn-on timing of the first buck switching element and a turn-on timing of a second buck switching element in a second buck-boost converter of the interleaved buck-boost converter partially overlap in a buck mode or a buck-boost mode.

3. The charging apparatus according to claim 1 , wherein the first buck-boost converter commonly uses the first inductor during operation in a buck mode and operation in a boost mode.

4. The charging apparatus according to claim 1 , wherein the converter controller adjusts a turn-on duty of the first buck switching element to control an output voltage generated from the first buck-boost converter and adjusts a turn-on duty of the first boost switching element to control power factor of an output voltage or an output current generated from the first buck-boost converter.

5. The charging apparatus according to claim 1 , wherein the converter controller adjusts a turn-on duty of each buck switching element in the plurality of buck-boost converters to control output voltages generated from the plurality of buck-boost converters and adjusts a turn-on duty of each boost switching element in the plurality of buck-boost converters to control each power factor of output voltages or output currents generated from the plurality of buck-boost converters.

6. The charging apparatus according to claim 1 , further comprising:
a first capacitor connected to an output of the rectifier
a second capacitor connected to the output of the interleaved buck-boost converter;
an input voltage detector to detect an output voltage of the rectifier;
an output voltage detector to detect an output voltage of the interleaved buck-boost converter; and
a current detector to detect current flowing into each inductor in the plurality of buck-boost converters of the interleaved buck-boost converter.

7. The charging apparatus according to claim 1 , wherein, in a buck mode or a buck-boost mode, the first buck switching element and the first boost switching element are independently operated and a second buck switching element and a second boost switching element in a second buck-boost converter connected in parallel to the first buck-boost converter are independently operated.

8. The charging apparatus according to claim 1 , wherein the converter controller determines a turn-on duty of the first buck switching element in the first buck-boost converter and a turn-on duty of a second buck switching element in a second buck-boost converter connected in parallel with the first buck-boost converter, based on an output voltage of the interleaved buck-boost converter and a target output voltage.

9. The charging apparatus according to claim 1 , wherein the converter controller determines
a turn-on duty of the first boost switching element, based on an output voltage of the interleaved buck-boost converter, a target output voltage, an input voltage of the interleaved buck-boost converter, and current flowing into the first inductor in the first buck-boost converter, and
a turn-on duty of a second boost switching element in a second buck-boost converter connected in parallel with the first buck-boost converter, based on the output voltage of the interleaved buck-boost converter, the target output voltage, the input voltage of the interleaved buck-boost converter, and current flowing into a second inductor in the second buck-boost converter.

10. The charging apparatus according to claim 1 , wherein a second buck-boost converter connected in parallel with the first buck-boost converter includes:
a second boost switching element
a second buck switching element connected to the rectifier,
a second inductor connected between the second buck switching element and the second boost switching element,
a third diode connected in parallel between the second buck switching element and the second inductor, and
a fourth diode connected between the second boost switching element and the output of the interleaved buck-boost converter.

11. The charging apparatus according to claim 1 , wherein the other converters, except for the first buck-boost converter among the plurality of buck-boost converters, have the same configuration as the first buck-boost converter and are connected in parallel with the first buck-boost converter.

12. An electric vehicle, comprising:
a battery;
a motor;
an inverter to convert direct current (DC) power provided from the battery into alternating current (AC) power to drive the motor, in a motor operation mode; and
a charging apparatus including a rectifier to rectify input AC power in a charging mode, an interleaved buck-boost converter to convert the rectified power into DC power to supply the converted DC power to the battery, the interleaved buck-boost converter including a plurality of buck-boost converters, and a converter controller to control the interleaved buck-boost converter,
wherein a first buck-boost converter of the interleaved buck-boost converter includes,
a first buck switching element connected to the rectifier,
a first boost switching element,
a first inductor connected between the first buck switching element and the first boost switching element,
a first diode connected in parallel between the first buck switching element and the first inductor, and
a second diode connected between the first boost switching element and an output of the interleaved buck-boost converter.

13. The electric vehicle according to claim 12 , wherein the converter controller adjusts a turn-on duty of the first buck switching element to control an output voltage generated from the interleaved buck-boost converter and adjusts a turn-on duty of the first boost switching element to control power factor of an output voltage or an output current generated from the interleaved buck-boost converter.

14. The electric vehicle according to claim 12 , wherein the charging apparatus further includes:
a first capacitor connected to an output of the rectifier
a second capacitor connected to the output of the interleaved buck-boost converter;
an input voltage detector to detect an output voltage of the rectifier;
an output voltage detector to detect an output voltage of the interleaved buck-boost converter; and
a current detector to detect current flowing into each inductor in the plurality of buck-boost converters of the interleaved buck-boost converter.

15. The electric vehicle according to claim 12 , wherein, in a buck mode or a buck-boost mode of the charging apparatus, the first buck switching element and the firs

Assignees

• Lg Electronics Inc

Inventors

• Kim Jungbum
• Park Chanheung
• Kim Donghee
• Jung Yunchul
• Lee Byoungkuk
• Ryu Seunghee
• Park Sanghoon

Classifications

• H02J2105/37

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

• H02J7/00

  Circuit arrangements for charging or discharging batteries or for supplying loads from batteries · CPC title

• H02M3/1582

  Buck-boost converters (H02M3/1584 takes precedence) · CPC title

• B60L2210/12

  Buck converters · CPC title

• B60L2210/14

  Boost converters · CPC title