Charging device

Patent metadata

Field	Value
Publication number	US-12090874-B2
Application number	US-202217697365-A
Country	US
Kind code	B2
Filing date	Mar 17, 2022
Priority date	Jun 28, 2021
Publication date	Sep 17, 2024
Grant date	Sep 17, 2024

Abstract

An embodiment charging device includes a power factor correction (PFC) circuit including first, second and third inductors and first, second and third switch legs connected to the first, second and third inductors, respectively, a relay network configured to control connection between the first, second and third inductors and first, second and third input terminals according to a phase of a power grid connected to the first, second and third input terminals, wherein the relay network includes a first relay connected between a neutral point and the third inductor, and a capacitor having a first end connected to the neutral point with respect to the first, second and third input terminals and a second end connected to ground, wherein the first end of the capacitor is positioned closer to the neutral point than the first relay.

First claim

What is claimed is:

1. A charging device comprising:
a power factor correction (PFC) circuit comprising first, second and third inductors and first, second and third switch legs connected to the first, second and third inductors, respectively;
a relay network configured to control connection between the first, second and third inductors and first, second and third input terminals according to a phase of a power grid connected to the first, second and third input terminals, wherein the relay network comprises a first relay connected between a neutral point and the third inductor; and
a capacitor having a first end connected to the neutral point with respect to the first, second and third input terminals and a second end connected to ground, wherein the first end of the capacitor is positioned closer to the neutral point than the first relay.

2. The charging device of claim 1 , further comprising a relay control circuit connected to the first, second and third input terminals and configured to detect one of the first, second and third input terminals to which a power source is connected and to control the relay network.

3. The charging device of claim 1 , wherein the relay network comprises:
a second relay including a first end connected to the first input terminal and the first inductor and a second end connected to the second input terminal and the second inductor;
a third relay connected between the second input terminal and the second inductor;
a fourth relay connected between the third input terminal and the third inductor; and
a fifth relay connected in parallel to the third inductor.

4. The charging device of claim 3 , further comprising:
a first capacitor connected between the ground and a first contact point closer to the first input terminal than the first end of the second relay, in a first power line between the first input terminal and the first inductor;
a second capacitor connected between the ground and a second contact point closer to the second input terminal than the third relay, in a second power line between the second input terminal and the second inductor; and
a third capacitor connected between the ground and a third contact point closer to the third input terminal than the fourth relay, in a third power line between the third input terminal and the third inductor.

5. The charging device of claim 3 , wherein:
in response to the first, second and third input terminals being connected to respective phases of a three-phase power source, the relay network is configured to connect each of the phases of the three-phase power source to a corresponding one of the first, second and third switch legs, and the PFC circuit is configured to operate as a three-phase boost PFC; and
in response to a single-phase power source being connected to one of the first, second and third input terminals, the relay network is configured to connect the single-phase power source to the first and second switch legs and to connect the third switch leg to the neutral point, and the PFC circuit is configured to operate as a single inductor type of an interleaved single-phase full-bridge PFC.

6. The charging device of claim 5 , wherein in response to the first, second and third input terminals being connected to the respective phases of the three-phase power source, the first relay, the second relay, and the fifth relay are turned off, and the third relay and the fourth relay are turned on.

7. The charging device of claim 5 , wherein in response to a single-phase power source being connected to the first input terminal, the first relay, the second relay, and the fifth relay are turned on, and the third relay and the fourth relay are turned off.

8. The charging device of claim 3 , wherein the relay network further comprises a sixth relay connected in parallel to a resistor connected between the first input terminal and the first inductor.

9. The charging device of claim 8 , wherein the charging device is configured to turn on the sixth relay after a peak of a voltage inputted to the PFC circuit.

10. A charging device comprising:
a power factor correction (PFC) circuit comprising first to third inductors and first, second and third switch legs connected to the first, second and third inductors, respectively;
a relay network configured to control connection between the first, second and third inductors and first, second and third input terminals according to a phase of a power grid connected to the first, second and third input terminals, wherein the relay network comprises:
a first relay connected between a neutral point and the third inductor;
a second relay including a first end connected to the first input terminal and the first inductor and a second end connected to the second input terminal and the second inductor;
a third relay connected between the second input terminal and the second inductor;
a fourth relay connected between the third input terminal and the third inductor; and
a fifth relay connected in parallel to the third inductor;

a capacitor having a first end connected to the neutral point with respect to the first, second and third input terminals and a second end connected to ground, wherein the first end of the capacitor is positioned closer to the neutral point than the first relay; and
a power converting circuit connected between the PFC circuit and a battery and configured to transmit power from the PFC circuit to the battery.

11. The charging device of claim 10 , wherein:
the first switch leg includes a first switch connected between the first inductor and a first input terminal of the power converting circuit and a second switch connected between the first inductor and a second input terminal of the power converting circuit;
the second switch leg includes a third switch connected between the second inductor and a first input terminal of the power converting circuit and a fourth switch connected between the second inductor and a second input terminal of the power converting circuit; and
the third switch leg includes a fifth switch connected between the third inductor and a first input terminal of the power converting circuit and a sixth switch connected between the third inductor and a second input terminal of the power converting circuit.

12. The charging device of claim 11 , wherein:
in response to a single-phase power source being connected to the first input terminal, the first relay, the second relay, and the fifth relay are turned on, and the third relay and the fourth relay are turned off;
during a period in which the single-phase power source is a positive voltage, a period in which the first switch, the third switch, and the sixth switch are turned on and a period in which the second switch, the fourth switch, and the sixth switch are turned on are repeated; and
during a period in which the single-phase power source is a negative voltage, a period in which the second switch, the fourth switch, and the fifth switch are turned on and a period in which the first switch, the third switch, and the fifth switch are turned on are repeated.

13. A charging device comprising:
a power factor correction (PFC) circuit comprising first, second and third inductors and first, second and third switch legs connected to the first, second and third inductors, respectively;
a relay network configured to control connection between the first, second and third inductors and first, second and third input terminals according to a phase of a power grid connected to the first, second and third input terminals, wherein the relay network comprises:
a first relay connected between a neutral point and the third inductor;
a second relay i

Assignees

• Hyundai Motor Co Ltd
• Kia Corp

Inventors

• Jun Changhan
• Park Junho
• Han Seunghyun
• Woo Semin

Classifications

• H02J7/96

  in response to battery voltage · CPC title

• H02M1/4233

  using a bridge converter comprising active switches · CPC title

• H02M1/4216

  operating from a three-phase input voltage (H02M1/4233 takes precedence) · CPC title

• H02J2207/20

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

• B60L53/14 Primary

  Conductive energy transfer · CPC title