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DC Detection Circuit for Printer

IP.com Disclosure Number: IPCOM000092251D
Original Publication Date: 1968-Oct-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Roehr, KM: AUTHOR

Abstract

This circuit replaces the reed relay which is normally employed for supervising the function of hammer drivers. The DC values to be discriminated are 0.5 A < or = I < or = 3A in which I is the sum of all printing currents. The main circuit component is an inductor serving as a frequency determinant for an LC oscillator. The inductor has core material having an almost rectangular B-H curve. At the low 1 value, the core has a high permeability and inductivity in its linear portion. At the high I value, the core becomes saturated and exhibits a low inductivity. This results in the resonant frequency being changed. A filter and detector are used for frequency detection. Standard SLT voltage levels are produced by an output level converter.

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DC Detection Circuit for Printer

This circuit replaces the reed relay which is normally employed for supervising the function of hammer drivers. The DC values to be discriminated are 0.5 A < or = I < or = 3A in which I is the sum of all printing currents. The main circuit component is an inductor serving as a frequency determinant for an LC oscillator. The inductor has core material having an almost rectangular B-H curve. At the low 1 value, the core has a high permeability and inductivity in its linear portion. At the high I value, the core becomes saturated and exhibits a low inductivity. This results in the resonant frequency being changed. A filter and detector are used for frequency detection. Standard SLT voltage levels are produced by an output level converter.

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