Signal generator, especially for ringing current in telecommunic

Details Signal generator, especially for ringing current in telecommunic Signal generator, especially for ringing current in telecommunic

1978-02-14

1979-05-01

Kominski, John

Oscillators

Single oscillator with plural output circuits

Plural outputs of diverse wave form

179 18HB, 330 10, 332 14, H04M 302

Patent

active

041526708

ABSTRACT:
A circuit arrangement for feeding a sinusoidal signal current to a wide range of loads, such as ringing current transmitted over subscriber lines from a telephone exchange, comprises a modulator which converts a rectified sine wave into a sequence of unipolar constant-amplitude pulses of varying width controlling, through a logic network, the energization of a load impedance via a resonant circuit from a d-c source. A switchover unit, including a transistor bridge having a diagonal connected across the d-c source, receives command signals from the logic network in response to the control pulses and to the outputs of two sensors determining the instant polarities of the load voltage and the load current in the output of the resonant circuit. The switchover unit produces a train of bipolar driving pulses, of constant amplitude and synchronized with the control pulses, whose polarity changes with alternate half-cycles of the sine wave fed in rectified form to the modulator.

REFERENCES:
patent: 4016501 (1977-04-01), Jasinski et al.
patent: 4059807 (1977-11-01), Hamada
patent: 4092610 (1978-05-01), White et al.

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