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Method for a circuit to increase hold-up time of the power supply

IP.com Disclosure Number: IPCOM000020723D
Publication Date: 2003-Dec-10
Document File: 2 page(s) / 140K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for a circuit to increase hold-up time of the power supply. Benefits include improved functionality and improved design flexibility.

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Method for a circuit to increase hold-up time of the power supply

Disclosed is a method for a circuit to increase hold-up time of the power supply. Benefits include improved functionality and improved design flexibility.

Background

         Telecommunication and computing equipment is required to continue to operate successfully through short dropouts or decreases in the supply voltage. The conventional method to meet this requirement is to include bulk storage capacitors at the power converter input behind diodes to prevent back feed to the source. The disadvantages to this approach include:

•         Hold-up time is proportional to the amount of bulk storage capacitance and is very dependent upon the operating voltage at the time that the transient occurred.

•         Limited space is available for large bulk storage capacitors in high-density computing equipment.

•         When operating at minimum source voltage, bulk storage is ineffective because a voltage change is required to remove energy from the bulk storage capacitors.

General description

         The disclosed method is a circuit that provides sufficient voltage to a power conversion subsystem for operation during a loss of power from the primary source. Operation continues during transient events, such as brownouts and dropouts.

Advantages

         Some implementations of the disclosed structure and method provide one or more of the following advantages:

•         Improved functionality due to enabling telecommunication and computing equipment to continue to operate successfully through short dropouts or decreases in the supply voltage

•         Improved design flexibility due to requiring less overall board area

Detailed description

         The disclosed method takes advantage of the voltage squared energy storage chara...