Switching circuit utilizing a base storage characteristics of a

Details Switching circuit utilizing a base storage characteristics of a Switching circuit utilizing a base storage characteristics of a

1974-07-30

1976-09-28

Britton, Howard W.

Telegraphy

Systems

Simplex-reversing periodic

178 695F, 318330, 307254, H04N 136

Patent

active

039833216

ABSTRACT:
A document/copy carrying drum of a facsimile transceiver is rotatably driven by a synchronous motor. The synchronous motor is connected as a load in series with a first transistor and a first power supply of one polarity. The synchronous motor is also connected in series with a second circuit and a second power supply of opposite polarity so as to apply DC voltages of opposite polarity during alternate conduction of the transistors. Conduction of the transistors is controlled by alternately applying a series of relatively low voltage pulses to the bases of the transistors through high frequency isolation transformers. The pulses are separated by a time interval less than the base storage time of the transistors so as to assure continuous conduction between the collector and emitter of a transistor while a series of pulses is applied to the base thereof.

REFERENCES:
patent: 3390231 (1968-06-01), Youngquist
patent: 3670105 (1972-06-01), Houck

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