Charging device

Patent metadata

Field	Value
Publication number	US-12355294-B2
Application number	US-202217830465-A
Country	US
Kind code	B2
Filing date	Jun 2, 2022
Priority date	Jul 22, 2021
Publication date	Jul 8, 2025
Grant date	Jul 8, 2025

Abstract

An embodiment charging device includes a power factor correction circuit first to third switch legs connected to first to third inductors, respectively, a relay network for controlling connection between the first to third inductors and first to third input terminals according to a phase of a power grid connected to the first to third input terminals, a relay control circuit connected to the first to third input terminals for sensing one of the first to third input terminals to which a power source is connected and controlling the relay network based on a sensing result, and a relay filter circuit including first to third filter capacitors connected between a ground plane and first to third sensing lines connected to the relay control circuit for sensing voltages of the first to third input terminals and a fourth filter capacitor connected between the ground plane and a chassis.

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;
a relay control circuit connected to the first, second, and third input terminals and configured to sense one of the first, second, and third input terminals to which a power source is connected and to control the relay network based on a sensing result; and
a relay filter circuit comprising:
first, second, and third filter capacitors connected between a ground plane and first, second, and third sensing lines connected to the relay control circuit and configured to sense voltages of the first, second, and third input terminals; and
a fourth filter capacitor connected between the ground plane and a chassis.

2. The charging device of claim 1 , wherein the relay network comprises:
a first relay comprising 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 second relay connected between the second input terminal and the second inductor;
a third relay connected between the third input terminal and the third inductor;
a fourth relay connected between a neutral point with respect to the first, second, and third input terminals and the third inductor; and
a fifth relay connected in parallel to the third inductor.

3. The charging device of claim 2 , wherein:
the relay filter circuit further comprises a fifth filter capacitor and a sixth filter capacitor respectively connected between the ground plane, a first power line connected between the relay control circuit and at least one of the first, second, third, fourth, or fifth relays, and a first control line; and
the at least one relay is configured to receive a power voltage through the first power line; and
an operation of the at least one relay is controllable by a relay control signal supplied through the first control line.

4. The charging device of claim 2 , wherein:
when the first, second, and third input terminals are connected to respective phases of a three-phase power source, the relay network connects 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
when a single-phase power source is connected to one of the first, second, and third input terminals, the relay network connects the single-phase power source to the first and second switch legs and connects the third switch leg to the neutral point, and the PFC circuit is configured to operate as a single inductor type of interleaved single-phase full-bridge PFC.

5. The charging device of claim 4 , wherein, when the first, second, and third input terminals are connected to respective phases of the three-phase power source, the first relay, the fourth relay, and the fifth relay are turned off, and the second relay and the third relay are turned on.

6. The charging device of claim 4 , wherein, when the single-phase power source is connected to the first input terminal, the first relay, the fourth relay, and the fifth relay are turned on, and the second relay and the third relay are turned off.

7. The charging device of claim 2 , further comprising a power converting circuit connected between the PFC circuit and a battery and configured to transmit power from the PFC circuit to the battery.

8. The charging device of claim 7 , wherein:
the first switch leg comprises 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 comprises a third switch connected between the second inductor and the first input terminal of the power converting circuit and a fourth switch connected between the second inductor and the second input terminal of the power converting circuit; and
the third switch leg comprises a fifth switch connected between the third inductor and the first input terminal of the power converting circuit and a sixth switch connected between the third inductor and the second input terminal of the power converting circuit.

9. The charging device of claim 8 , wherein, in a state in which a single-phase power source is connected to the first input terminal:
the first relay, the fourth relay, and the fifth relay are turned on, and the second relay and the third relay are turned off;
during a period in which a single-phase power supply has 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 supply has 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.

10. The charging device of claim 2 , 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; and
the charging device is configured to turn on the sixth relay after a peak of a voltage inputted to the PFC circuit.

11. The charging device of claim 1 , wherein the relay control circuit comprises:
a sensing part configured to sense voltages of the first, second, and third input terminals through the first, second, and third sensing lines and to generate three sensing signals indicating the sensed voltages;
a controller configured to receive the three sensing signals, to determine a phase of a power system connected to the first, second, and third input terminals, and to generate a phase sensing signal indicating the determined phase;
a power supplier configured to supply a power voltage to the relay network according to the phase sensing signal; and
a switching driver configured to supply a relay control signal to the relay network according to the phase sensing signal.

12. 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 comprising 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 second relay connected between the second input terminal and the second inductor;
a third relay connected between the third input terminal and the third inductor;
a fourth relay connected between a neutral point with respect to the first, second, and third input terminals and the third inductor; and
a fifth relay connected in parallel to the third inductor;

a relay control circuit connected to the first, second, and third input terminals and configured to sense one o

Assignees

• Hyundai Motor Co Ltd
• Kia Corp

Inventors

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

Classifications

• H02M1/44

  Circuits or arrangements for compensating for electromagnetic interference in converters or inverters · CPC title

• H02M3/33584

  Bidirectional converters · CPC title

• H02M3/33573

  Full-bridge at primary side of an isolation transformer · CPC title

• H02J2207/20

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

• H02M1/4233

  using a bridge converter comprising active switches · CPC title