Method and means for powering span lines

Details Method and means for powering span lines Method and means for powering span lines

H - Electricity

02

M

321/29

H02M 3/08 (2006.01) H04B 3/44 (2006.01)

Patent

CA 1122653

ABSTRACT OF THE DISCLOSURE An essentially non-dissipative, strap-free, continuously adjustable power unit inherently impervious to shorts and open circuits for powering repeaters in a Tl or similar telephone span line is disclosed. The unit uses a pulse-width modulated inverter in the converter input cir- cuit to produce a variable-voltage D.C. output to the span line. The pulse width or duty cycle of the inverter is controlled by a control logic which senses the span line current and maintains it at a selectable predetermined level without any appreciable power dissipation.

317943

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