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Switching Circuit with Rush Current Reduction

IP.com Disclosure Number: IPCOM000109792D
Original Publication Date: 1992-Sep-01
Included in the Prior Art Database: 2005-Mar-24
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Shimizu, M: AUTHOR

Abstract

Disclosed is a switching circuit having some devices to reduce the peak of "rush" current that damages a component (IC, fuse, etc.) when switching/power-on. The concept of this invention is shown in Fig. 1. When switching/power-on, it is possible to reduce the rush current by controlling the switching time.

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This is the abbreviated version, containing approximately 100% of the total text.

Switching Circuit with Rush Current Reduction

       Disclosed is a switching circuit having some devices to
reduce the peak of "rush" current that damages a component (IC, fuse,
etc.) when switching/power-on.  The concept of this invention is
shown in Fig. 1.  When switching/power-on, it is possible to reduce
the rush current by controlling the switching time.

      The circuit shown in Fig. 2. is an example of Fig. 1 which has
3 parameters (R1,R2,C1).  The combination of a capacitor C1 and a
resistor R1 determines the rush current at -ON active.  The other
combination of capacitor C1 and resistor R2 determines the rush
current at power-on.

      Generally, the following conditions exist:
- The bigger C1 becomes, the less -ON active rush current.
- The bigger C1 becomes, the more power-on rush current.
- The bigger R1 becomes, the less -ON active rush current.
- The bigger R2 becomes, the less power-on rush current.