H - Electricity – 02 – M
Patent
H - Electricity
02
M
323/6
H02M 3/335 (2006.01) H01J 29/52 (2006.01) H02M 5/10 (2006.01) H02M 5/293 (2006.01) H04N 5/04 (2006.01)
Patent
CA 1266508
ISOLATOR FOR POWER SYSTEM INSTRUMENT ABSTRACT OF THE DISCLOSURE 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 in- put 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 mod- ulator circuit at a suitable modulating frequency. A de- modulator 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.
497343
Bobry Howard H.
Macrae & Co.
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