Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1985-02-01
1987-05-26
Salce, Patrick R.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
324118, 315371, 315384, 358148, H02M 3335, H01J 2952, H04N 504
Patent
active
046690379
ABSTRACT:
A device for isolating an electrical instrument from an input voltage signal at a floating potential. The device includes a transformer with a center-tapped primary winding, a center-tapped secondary winding and a core magnetically coupling the primary and secondary windings. The input voltage signal is applied to an input terminal coupled to the center tap of the primary winding. A modulator circuit is connected to the primary winding for alternately applying the input voltage signal to opposite sections of the primary winding by means of photo FETs or the like for alternately switching the modulator circuit at a suitable modulating frequency. A demodulator circuit is connected to the secondary winding for alternately connecting each end of the secondary winding to a common return point to demodulate the output signal from the center tap of the secondary winding by means of FETs or the like. A control circuit at ground potential operates both the photo FETs of the modulator circuit and the FETs of the demodulator circuit.
REFERENCES:
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patent: 4191929 (1980-03-01), Max et al.
patent: 4293817 (1981-10-01), DeMichele
patent: 4319144 (1982-03-01), King et al.
patent: 4396882 (1983-08-01), Kellenbenz
patent: 4479175 (1984-10-01), Gille et al.
patent: 4565962 (1986-01-01), Nagano
Salce Patrick R.
Todd Voeltz Emanuel
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