Power supply with uninterruptible function

• US 20050078494A1
• Filed: 03/26/2004
• Published: 04/14/2005
• Est. Priority Date: 12/25/1998
• Status: Active Grant

• Current Assignee: Hitachi Information & Telecommunication Engineering, Ltd. (Hitachi, Ltd.)
• Original Assignee: Kenichi Onda, Nobuyuki Aihara, Norikazu Tokunaga, Satoru Masuyama, Shigekazu Zemba, Takeshi Onaka
• Inventors: Onda, Kenichi, Masuyama, Satoru, Tokunaga, Norikazu, Onaka, Takeshi, Zemba, Shigekazu, Aihara, Nobuyuki
• Granted Patent: US 7,053,502 B2
• Time in Patent Office: Days
• US Class Current: 363/37
• CPC Class Codes: H02J 9/061 for DC powered loads

Abstract

A power supply provided with: an AC/DC converter which receives AC power, converts the AC power into DC power, and outputs the DC power; a DC/DC converter which receives the DC power from the AC/DC converter, and controls a level of an output voltage of the DC/DC converter to be equal to a level of a voltage to be used by a load while the DC/DC converter supplies the output voltage to the load; a DC converter which is connected to an input of the DC/DC converter; and a DC power storage means which supplies electric power to the DC/DC converter through the DC converter.

Claims

1. :

A power supply comprising;

an AC/DC converter which converts an input AC power into DC power and outputs the DC power to an output terminal thereof, said AC/DC converter having power factor improvement function;

a DC/DC converter whose an input terminal is connected to the output terminal of said AC/DC converter, said DC/DC converter converting a DC voltage inputted thereto into a voltage value to be applied to and used at a load;

a DC converter whose a first terminal is connected to the output terminal of said AC/DC converter and the input terminal of said DC/DC converter; and

DC power storage means which is connected to a second terminal of said DC converter and which supplies said DC/DC converter with a DC power through said DC converter;

wherein usually, said load is supplied with the DC power from said AC/DC converter through said DC/DC converter, and said DC power storage means connected to said second terminal of said DC converter is supplied with the DC power to be charged from said AC/DC converter through the output terminal of said AC/DC converter, the first terminal of said DC converter and said DC converter; and

wherein, when the input AC power is not applied to said AC/DC converter, said load is supplied with the DC power from said DC power storage means through said second terminal, said DC converter, said first terminal and said DC/DC converter in order.

2. :

A power supply according to claim 1, wherein said DC converter comprises;

a first converter having an AC terminal, and a DC terminal which is said first terminal connected to the input terminal of said DC/DC converter;

a transformer having a high-voltage side winding connected to the AC terminal of said first converter, and a low-voltage side winding; and

a second converter having an AC terminal connected to the low-voltage side winding, and a DC terminal which is said second terminal connected to said DC power storage means.