High efficiency ringing generator

Details High efficiency ringing generator High efficiency ringing generator

1985-08-23

1987-03-03

Salce, Patrick R.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

363 97, 307270, 307288, H03K 402

Patent

active

046480196

ABSTRACT:
An improved ringing generator is disclosed, for producing and transmitting an AC ringing voltage waveform to a subscriber line from a negative and positive DC voltage source. The ringing generator is characterized by a transformer having a primary winding and a secondary winding. The primary winding includes a plurality of taps dividing the primary winding into a plurality of winding segments. The secondary winding is connected to subscriber line via a filter network. Each winding segment is connected to a buffer-driver which has a first lead connected to the DC voltage source and a second lead connected to a source of control signals. Responsive to the control signals a selected pair of buffer-drivers are alternatively enabled connecting for a predetermined time period the associated coupling segments to the DC voltage source thereby, producing a switched ringing voltage waveform which is coupled to the secondary winding.

REFERENCES:
patent: 3614589 (1971-10-01), Ireland et al.
patent: 4052658 (1977-10-01), Hucker
patent: 4415961 (1983-11-01), Harmon Jr.
patent: 4527081 (1985-07-01), Stewart

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