Half-wave signal isolator with means for controlling flux in the coupling transformer

In a signal isolator of the half-wave type comprising a coupling transformer having primary and secondary windings;

• first and second switches connected to said transformer windings, respectively, one of said switches serving to modulate a signal applied to the transformer primary and the other serving to demodulate the signal developed at the secondary of said transformer;
• and means for driving said switches in synchronism between closed and open states at a relatively high frequency;
• that improvement in such signal isolator comprising:
• resonating capacitor means coupled to said transformer during the open switch state to form therewith a resonant circuit tuned at least approximately to said frequency and providing controlled transformer current variations during the open switch state with relatively smooth transitions between the open and closed switch states.