Low power dissipation series regulator for PCM repeater lines

Details Low power dissipation series regulator for PCM repeater lines Low power dissipation series regulator for PCM repeater lines

1978-03-30

1980-05-13

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Voltage regulator protective circuits

361 94, 361 98, 323 9, H02H 308

Patent

active

042031419

ABSTRACT:
A current regulator for a pulse code modulated (PCM) transmission line is interposed between a voltage potential and a load (consisting of repeater amplifiers along the PCM transmission line) for limiting the current flow to the load. During normal operation, the regulator provides a relatively low impedance path from the voltage potential to the load through a series pass transistor and a sensing resistor. During an overload condition, which is sensed by the sensing resistor, the series pass transistor is deprived of base drive thereby providing a high impedance path with an accompanying increased voltage drop across the series pass transistor of the series regulator. This voltage drop is used to drive a timer which turns the series pass transistor off and on, with a low on time or duty cycle, in order to minimize power dissipation during the overload condition. After the overload condition has been alleviated, the series pass transistor is turned back on by the timer, and due to the low current flowing to the load, the series pass transistor is again returned to its relatively low impedance conducting condition.

REFERENCES:
patent: 3182246 (1965-05-01), Lloyd
patent: 3345554 (1967-10-01), Lupoli
patent: 3748569 (1973-07-01), Frank
patent: 3753079 (1973-08-01), Trilling
patent: 3771021 (1973-11-01), Bierly
patent: 3796943 (1974-03-01), Nelson et al.
patent: 3940572 (1976-02-01), Burgess
patent: 3959713 (1976-05-01), Davis et al.
patent: 4127886 (1978-11-01), Easter
"Pulse Width Regulated Conversion for Span Line Powering", by Townsend, National Telecommunications Conference, Conference Record, vol. III, p. 442-1, Dec. 5-7, 1977.

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