POWER SUPPLY DEVICE AND METHOD OF CONTROLLING POWER SUPPLY

• US 20140091629A1
• Filed: 04/12/2012
• Published: 04/03/2014
• Est. Priority Date: 05/30/2011
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Ishibashi, Yoshihito, Kitano, Hiroaki, Tajima, Shigeru, Natsume, Tetsu
• Granted Patent: US 9,705,361 B2
• Time in Patent Office: Days
• US Class Current: 307/66
• CPC Class Codes: H02J 2300/20 The dispersed energy generation being of renewable origin
• CPC Class Codes: H02J 2310/12 The local stationary network supplying a household or a building
• 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: H02J 7/35 with light sensitive cells
• CPC Class Codes: H02J 9/062 for AC powered loads
• CPC Class Codes: Y02B 10/70 Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies

Abstract

A converter which converts first AC power input from an external power system to DC power, a storage device charged with the DC power from the converter, an inverter which converts DC power from the storage device to second AC power, an output AC power generating unit to which the first AC power and the second AC power are input, the unit which generates output AC power, and a controller which obtains external power information indicating a relationship between a power supply and a power demand in the external power system through a network and outputs a control signal to control the output AC power generating unit according to the external power information are provided. The controller controls the output AC power generating unit according to a state of a margin of the power supply.

Claims

1. A power supply device, comprising:

a converter which converts first AC power input from an external power system to DC power;

a storage device charged with the DC power from the converter;

an inverter which converts DC power from the storage device to second AC power;

an output AC power generating unit to which the first AC power and the second AC power are input, the unit which generates output AC power; and

a controller which obtains external power information indicating a relationship between a power supply and a power demand in the external power system through a network and outputs a control signal to control the output AC power generating unit according to the external power information, wherein

the controller controls the output AC power generating unit such that the first AC power accounts for most of the output AC power when there is a margin of the power supply, and

the controller controls the output AC power generating unit such that the first AC power and the second AC power are added up to obtain the output AC power when there is no margin of the power supply.

2. The power supply device according to claim 1, wherein the controller controls the output AC power generating unit such that the second AC power accounts for most of the output AC power when power failure occurs.

3. The power supply device according to claim 1, wherein the external power information is information of difference between current or predicted power supply and current or predicted power demand or restriction information of the power demand.

4. The power supply device according to claim 1, wherein the external power information is obtained by also taking prediction of natural energy into consideration.

5. The power supply device according to claim 1, wherein the inverter outputs the second AC power synchronous with the first AC power.

6. The power supply device according to claim 1, wherein the storage device is charged with DC power generated from natural energy.

7. A method of controlling a power supply, comprising:

converting first AC power input from an external power system to DC power by a converter;

charging a storage device with the DC power from the converter;

converting DC power from the storage device to second AC power by an inverter;

generating output AC power by an output AC power generating unit from the first AC power and the second AC power; and

obtaining external power information indicating a relationship between a power supply and a power demand in the external power system through a network and generating a control signal to control the output AC power generating unit according to the external power information by a controller, wherein

the controller controls the output AC power generating unit such that the first AC power accounts for most of the output AC power when there is a margin of the power supply, and the controller controls the output AC power generating unit such that the first AC power and the second AC power are added up to obtain the output AC power when there is no margin of the power supply.