Alternating polarity power supply control apparatus

An electronic switching circuit for controlling transfer of electrical power from an alternating polarity electrical power supply means to a load means, said switching circuit comprising:

• a first transfer control field-effect device provided in and on a first substrate, said first transfer control field-effect device comprising:
• a first transfer control field-effect device channel region located at least in part in a first selected region of said first substrate;
• first transfer control field-effect device first and second terminating regions, separated by said first transfer control field-effect device channel region into which and out of which primary currents through said first field-effect device can, at least in part, pass upon electrical energization of said first transfer control field-effect device first and second terminating regions, said first field-effect device first terminating region being electrically connected to a first terminal means adapted for electrical connection to a first circuit portion arrangement which includes both said alternating polarity electrical power supply means and said load means, said first field-effect device second terminating region being electrically connected to a second terminal means adapted for electrical connection to said first circuit portion arrangement;
• and
• a first transfer control field-effect device gate region capable of affecting, upon electrical energization thereof, any current flow occurring through said first transfer control field-effect device channel region as a result of electrical energization of said first transfer control field-effect device first and second terminating regions;
• and
• a first parasitic bypass means having first and second terminating regions and having a control region therein by which said first parasitic bypass means is capable of being directed to effectively provide a conductive path of a selected conductivity between said first parasitic bypass means first and second terminating regions, said first parasitic bypass means first terminating region being electrically connected to one of said first transfer control field-effect device first and second terminating regions, said first parasitic bypass means second terminating region being electrically connected to said first substrate, and said first parasitic bypass means control region being electrically connected to said first transfer control field-effect device gate region, whereby a path of relatively high conductivity is established between said first parasitic bypass means first and second terminating regions if said first transfer control field-effect device is directed to permit a substantial current flow through said first transfer control field-effect device channel region between said first transfer control field-effect device first and second terminating regions.