Power supply device

Patent metadata

Field	Value
Publication number	US-9893608-B2
Application number	US-201414913473-A
Country	US
Kind code	B2
Filing date	Aug 12, 2014
Priority date	Aug 22, 2013
Publication date	Feb 13, 2018
Grant date	Feb 13, 2018

Abstract

According to one embodiment of the present invention, when a power supply device having first and second amplification units which share an energy storage element is used, it is possible to reduce voltage stress of a semiconductor device and to consistently maintain output voltage outputted to the first and second amplification units while individually adjusting the amplification rates of the first and second amplification units.

First claim

The invention claimed is:

1. A power supply device comprising:
an input power source unit to rectify AC power to output a first voltage;
an amplifying unit to amplify the first voltage received from the input power source unit and divide the amplified voltage into second and third voltages; and
a control unit to control the amplifying unit such that the second and third voltages have values equal to each other,
wherein the amplifying unit includes an inductor, and first and second amplifying units connected to both terminals of the inductor,
wherein the second voltage is output from the first amplifying unit, and the third voltage is output from the second amplifying unit,
wherein the first amplifying unit outputs the second voltage according to an operation of a first switching device, and the second amplifying unit outputs the third voltage according to an operation of a second switching device, and
wherein the control unit includes a voltage controller which compares output signals of the first and second amplifying units with a first reference voltage to output a first control signal.

2. The power supply device of claim 1 , wherein the control unit further includes a power factor improving circuit unit which receives the first control signal and outputs a compensation value to control a phase difference between a voltage and a current of the input power source unit.

3. The power supply device of claim 2 , wherein the power factor improving circuit unit is controlled according to the first control signal, the first voltage and a current flowing through the inductor.

4. The power supply device of claim 2 , wherein the control unit further includes a fine displacement control unit which compares the second and third voltages with second and third reference voltages, respectively, and outputs a fine displacement signal.

5. The power supply device of claim 4 , further comprising a comparator to compare a compensation value of the power factor circuit unit, the fine displacement signal and a triangular wave signal with one another to control the first and second switching devices.

6. The power supply device of claim 5 , wherein the fine displacement control unit includes first and second fine displacement control units,
the first fine displacement control unit compares the second voltage of the first amplifying unit with the second reference voltage to output a first fine displacement signal, and
the second fine displacement control unit compares the third voltage of the second amplifying unit with the third reference voltage to output a second fine displacement signal.

7. The power supply device of claim 6 , wherein the comparator includes first and second comparators,
the first comparator compares a first comparison signal, which is a sum of the compensation value of the power factor circuit unit and the first fine displacement signal, with the triangular wave signal to output a first PWM signal, and
the second comparator compares a second comparison signal, which is a sum of the compensation value of the power factor circuit unit and the second fine displacement signal, with the triangular wave signal to output a second PWM signal.

8. The power supply device of claim 7 , wherein the first PWM signal controls the first switching device, and
the second PWM signal controls the second switching device.

9. The power supply device of claim 8 , wherein the first comparison signal is applied to an non-inverting terminal of the first comparator,
the triangular wave signal is applied to an inverting terminal of the first comparator,
the second comparison signal is applied to an non-inverting terminal of the second comparator, and
the triangular wave signal is applied to an inverting terminal of the second comparator.

10. The power supply device of claim 6 , wherein the first and second fine displacement control units are configured as an operating amplifier.

11. The power supply device of claim 10 , wherein the first and second fine displacement control units include a negative feedback having a resistor and a capacitor connected in series with the resistor.

12. The power supply device of claim 5 , wherein the second reference voltage has a value equal to a value of the third reference voltage.

13. The power supply device of claim 5 , wherein a sum of the second and third reference voltages is equal to the first reference voltage.

14. A power supply device comprising:
an input power source unit to rectify AC power to output a first voltage;
an amplifying unit to amplify the first voltage received from the input power source unit and divide the amplified voltage into second and third voltages;
a control unit to control the amplifying unit such that the second and third voltages have values equal to each other;
a rectifier to rectify AC power to output a first voltage;
a first amplifying unit to amplify the first voltage to output a second voltage;
a second amplifying unit to amplify the first voltage to output a third voltage;
an inductor connected in series between the first and second amplifiers; and
a control unit to control the first and second amplifying units to maintain the second and third voltages to be equal to each other,
wherein:
the first amplifying unit includes a first switching device and a first output unit connected in parallel to the first switching device,
the second amplifying unit includes a second switching device and a second output unit connected in parallel to the second switching device,
the control unit controls the first and second switching devices to be operated in first and second operating modes,
the first and second switching devices are simultaneously turned on and off in the first operating mode, and
the first switching device is turned off at a first time point and the second switching device is turned off at a second time point in the second operating mode.

15. The power supply device of claim 14 , wherein the control unit controls the first and second switching devices to be operated in the second operating mode when the second and third voltages are different from each other.

16. The power supply device of claim 15 , wherein the first time point follows the second time point.

Assignees

• Lg Innotek Co Ltd

Inventors

• Kim Dong Gyun
• Huh Dong Young
• Lee Jae Sam

Classifications

• H02M7/06

  using discharge tubes without control electrode or semiconductor devices without control electrode · CPC title

• H02M7/217

  using semiconductor devices only · CPC title

• Y02B70/126

  Cross-Sectional Technologies · mapped topic

• H02M7/155

  using semiconductor devices only · CPC title

• H02M2001/009

  Electricity · mapped topic