Lamp power supply arrangement for key telephone system

Details Lamp power supply arrangement for key telephone system Lamp power supply arrangement for key telephone system

1974-11-07

1976-06-15

Rolinec, R. V.

Electric lamp and discharge devices: systems

Discharge device and/or rectifier in the supply circuit

Flashers

179 81C, 179 84L, 307252N, 307252UA, H05B 3700, H04L 1114, H03K 1768

Patent

active

039639576

ABSTRACT:
A lamp rate generator is disclosed which generates signals for controlling the illumination of key lamps at key telephone sets so that they may be illuminated at wink or flash rates. In addition, a "zero-crossing" signal is generated to determine the onset of conduction in a PNPN switch in the ungrounded side of the lamp power lead to ensure that the rise time of current delivered to the lamp load shall follow the rectified ac waveform of the power source. The circuit is most advantageously employed in time division PBXs which must be rendered secure against transient noise signals that could be induced by current surges having steep wave fronts.

REFERENCES:
patent: 3335291 (1967-08-01), Gutzwiller
patent: 3443204 (1969-05-01), Baker
patent: 3739104 (1973-06-01), O'Neill

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