Power supply for telephone exchange

Details Power supply for telephone exchange Power supply for telephone exchange

1988-11-14

1990-10-16

Ng, Jin F.

Telephonic communications

Centralized switching system

Power supply

379418, 379413, 379324, 323266, 363 56, H04M 1900, H04M 300

Patent

active

049641581

ABSTRACT:
A power supply (ringer power supply) for a telephone exchange comprising a first switching circuit for receiving and subjecting direct current to high frequency switching by means of a switching element, a converter transformer connected to the switching circuit, a smoothing circuit connected to the secondary side of the converter transformer, a second switching circuit connected to the output stage of the smoothing circuit and used for switching the input current by means of a transistor bridge of a plurality of transistors for being alternately turned on, a direct-current bypassing diode connected between the input and output terminals of each transistor, a driving circuit for driving each of the transistors in accordance with a predetermined driving signal, and a driving signal generator circuit for generating the driving signal for setting timing to prevent the period during which a transistor is turned on from overlapping the one during which another transistor is subsequently turned on, permitting a reduction in the size of the converter transformer for switching purposes and the current transformer for detecting current.

REFERENCES:
patent: 3970916 (1976-07-01), Kienscherf
patent: 4220826 (1980-09-01), Kiss
patent: 4239935 (1980-12-01), Bosik et al.
patent: 4264786 (1981-04-01), Yoshino et al.
patent: 4330816 (1982-05-01), Imazeki et al.
patent: 4341928 (1982-07-01), Stanson et al.
patent: 4404623 (1983-09-01), Jourdan
patent: 4584635 (1986-04-01), MacInnis et al.
"A Switched Mode Power Supply for the Pulse EPABX", A. Dvorak, Conference: INTELEC `78` International Telephone Energy Conference, Wash., D.C., USA, Oct. 25-27, 1978, pp. 140-143.
"Direct Off-Line Rectifier Units for Telecommunications Applications", G. Arnold, Conference: INTELEC '78, International Telephone Energy Conference, Wash., D.C., USA, Oct. 25-27, 1978, pp. 140-143.

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