POWER CONDITIONER

• US 20090236916A1
• Filed: 08/03/2007
• Published: 09/24/2009
• Est. Priority Date: 08/28/2006
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Nishimura, Kazuhito
• Granted Patent: US 8,106,535 B2
• Time in Patent Office: Days
• US Class Current: 307/80
• CPC Class Codes: H02J 2300/24 of photovoltaic origin
• CPC Class Codes: H02J 2300/28 The renewable source being wind energy wind motors F03D
• CPC Class Codes: H02J 2300/30 The power source being a fuel cell
• CPC Class Codes: H02J 2300/40 wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
• CPC Class Codes: H02J 3/381 Dispersed generators
• CPC Class Codes: H02J 7/35 with light sensitive cells
• CPC Class Codes: H02M 1/0006 Arrangements for supplying an adequate voltage to the control circuit of converters
• CPC Class Codes: Y02B 10/10 Photovoltaic [PV]
• CPC Class Codes: Y02E 10/56 Power conversion systems, e.g. maximum power point trackers
• CPC Class Codes: Y02E 10/76 Power conversion electric or electronic aspects

Abstract

A reliable power conditioner in a system having three power sources: a direct-current power source such as a solar cell, an accumulating unit such as an accumulator, and a commercial power system.

The power conditioner is provided: a power converting circuit for converting direct-current power obtained from a direct-current power source to alternating-current power of a commercial power system; a charger/discharger circuit for charging the direct-current power obtained from the direct-current power source to an accumulator or discharging the direct-current power stored in the accumulator; a control circuit for controlling the power converting circuit and the charger/discharger circuit; a first power source circuit for supplying power from the direct-current power source to the control circuit; a second power source circuit for supplying power from the accumulator to the control circuit; a third power source circuit for supplying power from the commercial power system to the control circuit; and a power source selecting circuit for selecting at least one of the first, second, and third power source circuits and supplying power to the control circuit.

Claims

1. A power conditioner comprising:

a power converting circuit for converting direct-current power obtained from a direct-current power source to alternating-current power of a commercial power system;

a charger/discharger circuit for charging the direct-current power obtained from the direct-current power source to an accumulator or discharging the direct-current power stored in the accumulator;

a control circuit for controlling the power converting circuit and the charger/discharger circuit;

a first power source circuit for supplying power from the direct-current power source to the control circuit;

a second power source circuit for supplying power from the accumulator to the control circuit;

a third power source circuit for supplying power from the commercial power system to the control circuit; and

a power source selecting circuit for selecting at least one of the first, second, and third power source circuits and supplying power to the control circuit.

2. The power conditioner according to claim 1, wherein the power converting circuit includes a DC-DC converter and an inverter circuit, and the inverter circuit converts direct-current power to alternating-current power to output the alternating-current power to the commercial power system interconnected thereto.

3. The power conditioner according to claim 2, wherein the inverter circuit is a bidirectional inverter, alternating-current power supplied from the commercial power system is converted to direct-current power by the bidirectional inverter, and the direct-current power is charged into the accumulator by the charger/discharger circuit, or direct-current power accumulated in the accumulator is discharged by the charger/discharger circuit, the direct-current power is converted to alternating-current power by the bidirectional inverter, and the alternating-current power is outputted to the commercial power system or supplied to a load.

4. The power conditioner according to claim 1, wherein the first power source circuit supplies power to the control circuit, the DC-DC converter, and the inverter circuit via the power source selecting circuit.

5. The power conditioner according to claim 1, wherein the second power source circuit supplies power to the control circuit, the inverter circuit, and the charger/discharger circuit via the power source selecting circuit.

6. The power conditioner according to claim 1, wherein the third power source circuit supplies power to the control circuit, the inverter circuit, and the charger/discharger circuit via the power source selecting circuit.

7. The power conditioner according to claim 1, wherein the power source selecting circuit selects the first power source circuit preferentially over the second and third power source circuits.

8. The power conditioner according to claim 1, wherein the power source selecting circuit selects the second power source circuit preferentially over the third power source circuit.

9. The power conditioner according to claim 1, wherein the power source selecting circuit is a circuit that is selectively connected to any of the first, second, and third power source circuits.

10. The power conditioner according to claim 1, wherein the power source selecting circuit is a circuit for selecting a power source circuit having a large output voltage from the first, second, and third power source circuits.