Uninterruptible duplexed power supply system

• US 6,212,081 B1
• Filed: 03/30/2000
• Issued: 04/03/2001
• Est. Priority Date: 05/14/1999
• Status: Expired due to Term

• Current Assignee: Nihon Protector Company Limited
• Original Assignee: Nihon Protector Company Limited
• Inventors: Sakai, Setsuo
• Primary Examiner(s): HAN, YOUNGHUIE JESSICA
• Application Number:
  US09/538,229
• Time in Patent Office: 369 Days
• Field of Search: 363/65, 363/71, 363/50, 363/55, 363/56, 307/64, 307/66, 307/71, 307/85, 307/86
• US Class Current: 363/71
• CPC Class Codes: H02J 9/061 for DC powered loads
• CPC Class Codes: H02J 9/067 using multi-primary transformers, e.g. transformer having one primary for each AC energy source and a secondary for the loads

Abstract

The present invention provides an uninterruptible duplexed power supply system, which is capable of achieving high efficiency and compact size, and moreover, is capable of solving for a power circuit failure in an energized state. This uninterruptible duplexed power supply system connects via a high-frequency transformer 7 a power circuit A, which rectifies AC from a commercial AC power supply 1, and which includes a switching device 6 for outputting; a secondary DC outputting circuit B, which supplies electric power to a load; and a DC power circuit C, including a switching device 20 for synchronizing with switching device 6 of power circuit A, and for operating this DC power circuit C, and is constituted so that the power circuit A is unitized, and this power circuit unit is detachable in a connected state, wherein same is connected electrically to the high-frequency transformer 7, and in a connection release state, and is constituted so as to provide device for buffering or preventing overcurrent reverse current resulting from induced voltage from the DC power circuit C via the high-frequency transformer 7 to the power circuit A, and so that the power circuit unit is detachable in an energized state.

Claims

1. An uninterruptible duplexed power supply system, which is constituted by connecting to the primary winding of a high-frequency transformer a AC power circuit comprising a rectifying circuit, which rectifies the AC from a commercial AC power supply, and a first switching device provided on the output side of this rectifying circuit;

and connecting to a secondary winding of said high-frequency transformer a secondary DC outputting circuit, which supplies electric power to a load; and

connecting to a tertiary winding of said high-frequency transformer a DC power circuit, comprising a second switching device for either synchronizing with said AC power circuit, or for operating said DC power circuit in accordance with the operating status of the AC power circuit, this uninterruptible duplexed power supply system being constituted so that at least the AC power circuit is unitized, and the AC power circuit is detachable in a connected state, in which the AC power circuit is electrically connected to the primary winding of said high-frequency transformer, and in a connection release state, wherein this connected state is released; and

in constituted so as to provide means for either buffering or preventing an overcurrent reverse current resulting from induced voltage from said DC power circuit via said high-frequency transformer to said power circuit, and so that said power circuit unit is detachable in an energized state.

2. The uninterruptible duplexed power supply system according to claim 1, wherein during normal operation of said commercial AC power supply, the first switching device of said AC power circuit is in the active state, this AC power circuit operates, and the second switching device of said DC power circuit is either idle, or in the OFF state, and this DC power circuit is maintained in the idle state;

and when there is an abnormality, in which said commercial AC power supply drops below a prescribed value, the first switching device of said AC power circuit becomes either idle or enters the OFF state, and the second switching device of said DC power circuit transitions to the active state, this DC power circuit operates and an uninterruptible power supply is furnished to said load.

3. The uninterruptible duplexed power supply system according to claim 1, which is constituted so that said DC power circuit is unitized, and this DC power circuit unit is detachable in a connected state, in which same is electrically connected to the tertiary winding of said high-frequency transformer, and in a connection release state, wherein this connected state is released;

and is constituted so as to provide means for either buffering or preventing an overcurrent reverse current resulting from induced voltage from said AC power circuit via said high-frequency transformer to said DC power circuit, and so that said DC power circuit unit is detachable in an energized state.

4. The uninterruptible duplexed power supply system according to claim 1, which is constituted so that a smoothing capacitor for storing DC voltage in said DC power circuit is provided;

means for buffering or preventing said overcurrent reverse current constitute a limiting resistor and a reverse current-preventing diode connected in parallel;

voltage induced in the primary winding of said high-frequency transformer when said DC power circuit is operating is stored in said smoothing capacitor via said limiting resistor; and

said smoothing capacitor backs up said secondary DC outputting circuit when a battery provided in this DC power circuit fails, or this DC power circuit fails.