H - Electricity – 04 – N
Patent
H - Electricity
04
N
178/3, 323/9
H04N 1/36 (2006.01) H02M 7/537 (2006.01) H03K 17/60 (2006.01) H04N 1/053 (2006.01) H04N 1/06 (2006.01)
Patent
CA 1052279
ABSTRACT OF THE DISCLOSURE 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.]
227000
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