Browse Prior Art Database

Bipolar Transient Protection

IP.com Disclosure Number: IPCOM000039989D
Original Publication Date: 1987-Sep-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Kraus, RA: AUTHOR [+3]

Abstract

This article describes devices for the suppression of damaging transients in an analog data acquisition system at a common point, making local transient protection unnecessary. Electrical and electronic components connected to an automotive electrical system are constantly being exposed to electrical transients generated from inductive loads, such as motors, solenoids and relays. Presently, transient protection is built into each electronic device. The devices, disclosed herein, eliminate power transients at a common point, making local transient protection unnecessary and allowing a system cost reduction to be realized. When solid-state switching is used to switch loads and control current in a common ground environment, it is desirable to have asymmetrical transient clipping.

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Bipolar Transient Protection

This article describes devices for the suppression of damaging transients in an analog data acquisition system at a common point, making local transient protection unnecessary. Electrical and electronic components connected to an automotive electrical system are constantly being exposed to electrical transients generated from inductive loads, such as motors, solenoids and relays. Presently, transient protection is built into each electronic device. The devices, disclosed herein, eliminate power transients at a common point, making local transient protection unnecessary and allowing a system cost reduction to be realized. When solid-state switching is used to switch loads and control current in a common ground environment, it is desirable to have asymmetrical transient clipping. The devices of this disclosure allow asymmetrical clipping. Symmetrical clipping could be achieved by selecting Zener diodes having the same Zener voltages. The devices shown in Figs. 1A and 1B consist of two Zener diodes connected cathode to cathode and anode to anode, respectively. Both devices are functionally identical in that an asymmetrical clamp is possible. In Fig. 1A, assume that a +100-volt and -60-volt 2-microsecond transient is to be clipped to no more than +30 and -16 volts. In the case of a positive-going transient, the value of Z2 would be ideally selected to be 29.3 volts with the remaining 0.7 volts dropped across the forward biased Z1. In the...