Browse Prior Art Database

Electronic Circuit Protector-Circuit Breaker

IP.com Disclosure Number: IPCOM000105495D
Original Publication Date: 1993-Aug-01
Included in the Prior Art Database: 2005-Mar-20
Document File: 2 page(s) / 61K

Publishing Venue

IBM

Related People

Beck, HJ: AUTHOR [+2]

Abstract

Described is a new kind of automatic electronic circuit protector/circuit breaker which is used as an energy limiting device.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Electronic Circuit Protector-Circuit Breaker

      Described is a new kind of automatic electronic circuit
protector/circuit breaker which is used as an energy limiting device.

      In the past, hydraulic/magnetic circuit protectors were
employed for overcurrent protection in power supplies of data
processing equipment and printers.  They operate more accurately than
fuses, can be easily reset without exchanging any component and are
used as high-side switches in the positive outputs of power supplies.

      With the introduction of switch mode power supplies,
overcurrent protection means have been placed for simplicity in the
return leads of outputs to be protected.

      For a new product it was necessary to protect
operator-accessible contacts under power such that the available
continuous energy is limited to less than 240 VA, as specified in
IEC950.  As the associated power supplies have their own overcurrent
protectors typically placed as low-side switches in the return leads,
the current could only be con trolled on the high-side of the energy
limiting circuit.  In addition, it was necessary to send an error
message from the high-side circuits to the power controller via
ground referenced TTL circuits.  Corresponding ground referenced TTL
signals from the power controller are used to turn the high-side
circuits of the energy limiting circuit on or off.

      The problem was solved by using a commercially available
integrated circuit module which includes circuits to shift ground
referenced signals to high-side circuits and vice versa.  The
integrated circuit module contains a MOS gate driver to con...