Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1993-03-18
1995-08-01
Stephan, Steven L.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
36446402, H02M 3335, G06F 1520
Patent
active
054384966
ABSTRACT:
A connection device without electrical contact for connecting a fixed part of a franking machine to a rotary print drum containing electronic circuits includes a transformer separable into two parts respectively fastened to the fixed part and to the rotary printing drum. A first modulator chops and modulates a DC current supplied to a first winding in sympathy with a first signal to be transmitted to the rotary drum. A rectifier and filter device supplies power to the electronic circuits in the rotary drum. A first demodulator demodulates the current induced in the second winding. A second modulator modulates the current induced in the second winding at a different frequency to that used by the first modulator and in sympathy with a second signal to be transmitted to the fixed part. A second demodulator extracts the second signal from the current in the first winding.
REFERENCES:
patent: 4471440 (1984-09-01), Check, Jr.
patent: 4916626 (1990-04-01), Vermesse
patent: 4945255 (1990-07-01), Suzuki et al.
patent: 5267132 (1993-11-01), Gulczynski
patent: 5267172 (1993-11-01), Vermesse
patent: 5272381 (1993-12-01), Millard
patent: 5309343 (1994-05-01), Schlenk
Patent Abstracts of Japan, vol. 11, No. 51 (E-480) Feb. 17, 1987 & JP-A-61 214 407 (MITA) Sep. 24, 1986.
Meur Jean-Pierre
Vermesse Bernard
Nguyen Matthew V.
Societe Anonyme Dite: Neopost Industrie
Stephan Steven L.
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