POWER SUPPLY APPARATUS AND DRIVING METHOD THEREOF

• US 20150109828A1
• Filed: 10/22/2014
• Published: 04/23/2015
• Est. Priority Date: 10/22/2013
• Status: Active Grant

• Current Assignee: Semiconductor Components Industries LLC (ON Semiconductor Corporation)
• Original Assignee: Fairchild Korea Semiconductor Limited (ON Semiconductor Corporation)
• Inventors: KOO, Gwanbon, KIM, Jintae, PARK, Youngbae, CHO, Donghye, JUNG, Dooyong, KIM, Taesung, KIM, Kyungseop
• Granted Patent: US 9,350,257 B2
• Time in Patent Office: Days
• US Class Current: 363/17
• CPC Class Codes: H02J 2300/24 of photovoltaic origin
• CPC Class Codes: H02J 2300/26 involving maximum power point tracking control for photovoltaic sources maximum power point systems in particular G05F1/67
• CPC Class Codes: H02J 3/381 Dispersed generators
• CPC Class Codes: H02J 3/46 Controlling of the sharing of output between the generators, converters, or transformers
• CPC Class Codes: H02M 1/0048 Circuits or arrangements for reducing losses using snubbers H02M1/34
• CPC Class Codes: H02M 1/0077 Plural converter units whose outputs are connected in series
• CPC Class Codes: H02M 3/33553 with galvanic isolation between input and output of both the power stage and the feedback loop
• CPC Class Codes: H02M 3/33561 having more than one ouput with independent control
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
• CPC Class Codes: Y02E 10/56 Power conversion systems, e.g. maximum power point trackers

Abstract

A power supply apparatus and a driving method thereof are disclosed. The power supply apparatus includes a first converter and a second converter. The first converter is operated to acquire a first gain when an input voltage is included in a first range or a second range that is lower than a first range and outputs a first output voltage and a second output voltage by converting the input voltage. In addition, the second converter is operated when the input voltage is included in the first range and outputs a third output voltage by converting the second output voltage.

Claims

1. A power supply apparatus comprising

a first converter operated to acquire a first gain when an input voltage is included in a first range and configured to output a first output voltage and a second output voltage by converting the input voltage;

and

a second converter operated when the input voltage is included in the first range and configured to output a third output voltage by converting the second output voltage.

2. The power supply apparatus of claim 1, wherein when the input voltage is included in a second range that is higher than the first range, the first converter is operated to acquire the first gain and configured to output the first output voltage and the second output voltage by converting the input voltage.

3. The power supply apparatus of claim 2, wherein when the input voltage is included in a third range that is higher than the second range, the first converter is operated to acquire a second gain that is lower than the first gain.

4. The power supply apparatus of claim 2, wherein the second converter is not operated when the input voltage is included in the second range and does not output the third output voltage.

5. The power supply apparatus of claim 3, wherein the second converter is not operated when the input voltage is included in the third range and does not output the third output voltage.

6. The power supply apparatus of claim 1, wherein the first gain is a fixed gain.

7. The power supply apparatus of claim 6, wherein the first converter is an LLC resonance-type converter having a fixed switching frequency.

8. The power supply apparatus of claim 3, wherein the first converter is operated in a burst mode when the input voltage is included in the third range.

9. The power supply apparatus of claim 3, wherein the first converter reduces a switching duty when the input voltage is included in the third range.

10. The power supply apparatus of claim 2, wherein the input voltage is output from a solar cell.

11. The power supply apparatus of claim 10, wherein the second range is a range of a voltage output from the solar cell by control of a maximum power point tracking (MPPT) controller.

12. The power supply apparatus of claim 7, wherein the LLC resonance type converter comprises:

a switching unit switching the input voltage;

a capacitor including a first end connected to the switching unit;

an inductor including a first end connected to a second end of the capacitor;

a transformer including a primary wire connected between a second end of the inductor and a ground;

a first output unit connected to a secondary wire of the transformer and outputting the first output voltage; and

a second output unit connected to the secondary wire of the transformer and outputting the second output voltage.

13. The power supply apparatus of claim 12, wherein the switching unit comprises a half-bridge structure and the first output unit comprises a voltage-doubler structure.

14. The power supply apparatus of claim 12, wherein the switching unit comprises a full-bridge structure and the first output unit comprises a voltage-doubler structure.

15. The power supply apparatus of claim 10, further comprising an inverter configured to receive a sum of the first output voltage and the third output voltage and configured to convert the sum to an AC voltage.

16. A method for driving a power supply apparatus, comprising:

sensing an input voltage;

converting the input voltage to a first output voltage and a second output voltage with a first gain when the sensed input voltage is included in a first range;

converting the second output voltage to a third output voltage when the sensed input voltage is included in the first range; and

merging the first output voltage and the third output voltage to a fourth output voltage.

17. The method for driving the power supply apparatus of claim 16, further comprising, when the sensed input voltage is included in a second range that is higher than the first range, converting the input voltage to the first output voltage and the second output voltage with the first gain.

18. The method for driving the power supply apparatus of claim 17, further comprising, when the sensed input voltage is included in a third range that is higher than the second range, converting the input voltage with a second gain that is lower than the first gain.

19. The method for driving the power supply apparatus of claim 17, wherein when the sensed input voltage is included in the second range, the third output voltage is not generated and the first output voltage is the fourth output voltage.

20. The method for driving the power supply apparatus of claim 18, wherein when the sensed input voltage is included in the third range, the third output voltage is not generated.

21. The method for driving the power supply apparatus of claim 16, wherein the first gain is a fixed gain.

22. The method for driving the power supply apparatus of claim 21, wherein the converting the input voltage comprises:

providing an LLC resonance-type converter; and

converting the input voltage to the first output voltage and the second output voltage with the first gain by fixing a switching frequency of the LLC resonance-type converter.