Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1993-08-24
1995-08-08
Wambach, Margaret Rose
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
379373, 379376, G05F 110
Patent
active
054402620
ABSTRACT:
An embodiment of the present invention is a power generator which provides a power waveform for applying power to ringing circuits and message-waiting lamps (Ring/MWL) in standard analog telephones in a PBX and which power generator reduces power dissipation. In particular, an embodiment of the inventive power generator includes: (a) a controller which generates a low-level signal representing the power waveform and a timing and control signal indicative of various portions of the low-level analog signal; (b) a circuit, responsive to the timing and control signal, which alters the output of a power supply; and (c) a power amplifier, responsive to the low-level signal and the output of the power supply, which amplifies the low-level signal to produce the power waveform.
REFERENCES:
patent: 5230018 (1993-07-01), Gericke
Lum Jack G. S.
Pong Peter
Einschlag Michael B.
ROLM Company
Wambach Margaret Rose
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