Unlock instant, AI-driven research and patent intelligence for your innovation.

Power supply apparatus and power supply control device

a power supply and control device technology, applied in the direction of electric variable regulation, process and machine control, instruments, etc., can solve the problems of mechanical failure of the output capacitor, voltage undershoot of the power supply, and the source voltage drop

Inactive Publication Date: 2005-06-09
IBM CORP
View PDF3 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008] The purpose of this invention is to provide a power supply apparatus and a power supply control device, which can solve the above-described problems. According to a first aspect of the invention, a power supply apparatus adapted to supply a DC source voltage is provided that includes a source voltage supply unit to supply a source voltage t

Problems solved by technology

However, this approach suffers from a rapid decrease in source voltage as the output capacitor discharges, which may result in voltage undershoot of the power supply.
Therefore, discharging an output capacitor with an active synchronous commutation FET on the low voltage side of the DC / DC converter may result in a reverse bias of the output capacitor due to the voltage undershoot caused by the power supply interrupt, leading in turn to mechanical failure of the output capacitor.
Accordingly, if reverse voltage with undershoot is applied to such a semiconductor device, malfunction or physical damage may result.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Power supply apparatus and power supply control device
  • Power supply apparatus and power supply control device
  • Power supply apparatus and power supply control device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013] The present invention is directed to a power supply apparatus that reduces undershoot of source voltage and quickly discharges an output capacitor to mitigate the adverse effects of a power supply interrupt.

[0014]FIG. 1 shows a power supply 10 that supplies a DC source voltage Vout, and has a discharge path 132 to discharge electrical charge accumulated in an output capacitor 115 through a discharge resistor 135 when a power supply interrupt occurs. During an interrupt, the power supply apparatus 10 turns on the discharge path 132 and discharges the output capacitor 115 according to an RC time constant controlled by the discharge resistor 135. The value of the resistor 135 may be set such that the degree of voltage undershoot is within a predefined value and the time until the source voltage decreases to zero, as measured from the interrupt of the supply, is within a specified time. The power supply apparatus 10 has a source voltage supply unit 100, an output capacitor 115, ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A power supply apparatus is provided, which reduces undershoot of a DC source voltage when a power supply interrupt occurs. The power supply apparatus supplies a DC voltage to an output of the power supply apparatus, an output capacitor is provided between the power supply output and ground, and a resistor controls the discharge time constant when the supply of source voltage is temporarily halted. The resistor is coupled in series with a switch, forming a discharge path to ground for the output capacitor. A discharge path switch disables the discharge path when source voltage is supplied. The discharge path is enabled in the event of a power supply interrupt and disabled during normal power supply operation.

Description

BACKGROUND OF INVENTION [0001] 1. Field of the Invention [0002] This invention relates to a power supply apparatus and a power supply control device, and particularly to a power supply apparatus and a power supply control device to reduce undershoot of source voltage when a power supply interrupt occurs. [0003] 2. Background of the Invention [0004] Conventional integrated circuit power supply systems include, a DC / DC converter with a synchronous commutation type switching regulator. When a power supply incorporating a DC / DC converter experiences an interrupt, a synchronous commutation FET is commonly used to discharge an output capacitor on the low voltage side of the DC / DC converter. [0005] However, this approach suffers from a rapid decrease in source voltage as the output capacitor discharges, which may result in voltage undershoot of the power supply. Japanese Published Unexamined Patent Application (PUPA) 10-295074 (pp. 3 and 6, FIG. 2) discloses a method of preventing undersho...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H02M3/155G05F1/40H02M1/36H02M3/158
CPCH02M1/36Y02B70/1466H02M2001/322H02M3/1588H02M1/322Y02B70/10
Inventor SAITOH, MANABU
Owner IBM CORP