Electrical invertor apparatus

Invertor apparatus comprising, in combination:

• a solenoid wound on a substantially spool shaped core having end flanges;
• a D.C. supply connected to said solenoid;
• an electrically insulating disc mounted on one of said end flanges;
• a generally cylindrical central electrode mounted on said disc, substantially coaxial with said solenoid;
• two substantially 180.degree. annular sector outer electrodes mounted on said disc around said central electrode to define a substantially continuous annular electric discharge gap between said central electrode and said outer electrodes;
• an output transformer provided with a primary winding having its ends connected to respective ones of said two outer electrodes and a secondary winding having a pair of output terminals of said apparatus, said primary winding having a center tap;
• and
• a D.C. power supply connected between said center tap and said central electrode.

A high frequency invertor apparatus comprising, in combination:

• a generally cylindrical central electrode;
• an even numbered multiplicity of substantially identical outer electrodes disposed in a generally annular array around said central electrode and defining a substantially continuous annular discharge gap with respect thereto, alternate ones of said outer electrodes being connected together to define first and second groups of commonly connected outer electrodes;
• an output device including an input inductance in the form of a winding having first and second ends respectively connected to said first and second groups of electrodes and a center tap for connection through a D.C. power supply to said central electrode;
• and
• magnetic field producing means adapted to produce a unidirectional magnetic field in said discharge gap, substantially at right angles thereto.

A two-phase invertor comprising, in combination:

• a circular central electrode connected to a first D.C. input terminal;
• first, second, third and fourth annular sector outer electrodes disposed in an annular array around said central electrode and defining therewith a substantially continuous annular discharge gap;
• magnetic field producing means adapted to produce a unidirectional magnetic field in said discharge gap substantially at right angles thereto;
• and
• an output transformer comprising first, second, third and fourth identically wound primary windings having first ends connected in common to a second D.C. input terminal and second ends connected to correspondingly numbered ones of said four outer electrodes, and first and second independent groups of first, second, third and fourth series connected secondary windings associated respectively with correspondingly numbered ones of said four primary windings, such that:
• (a) said first secondary winding of said first group is wound in the same sense as said first primary winding whereas said first secondary winding of said second group is wound in the opposite sense;
• (b) said second secondary winding of both of said groups are wound in the same sense as said second primary winding;
• (c) said third secondary winding of said first group is wound in the oppposite sense to that of said third primary winding whereas said third secondary winding of said second group is wound in the same sense as said third primary winding;
• and
• (d) both of said fourth secondary windings of said first and second groups are wound in the opposite sense to that of their associated fourth primary winding.

A three-phase invertor comprising, in combination:

• a circular central electrode connected to a first D.C. input terminal;
• first, second, third, fourth, fifth and sixth annular sector outer electrodes disposed in an annular array around said central electrode and defining therewith a substantially continuous annular discharge gap;
• magnetic field producing means adapted to produce a unidirectional magnetic field in said discharge gap, substantially at right angles thereto;
• and
• an output transformer comprising first, second, third, fourth, fifth and sixth identically wound primary windings having first ends connected in common and second ends connected to correspondingly numbered ones of said six outer electrodes, and first, second and third independent groups of first, second, third, fourth, fifth and sixth series connected secondary windings associated respectively with correspondingly numbered ones of said six primary windings, such that:
• (a) said first secondary winding of each of said first, second and third groups is wound in the opposite sense to said first primary winding;
• (b) said second secondary windings of said first and second groups is wound in the opposite sense to said second primary winding whereas said second secondary winding of said third group is wound in the same sense as said second primary winding;
• (c) said third secondary winding of said first group is wound in the opposite sense to that of said third primary winding whereas said third secondary winding of said second and third groups are wound in the same sense as said third primary winding;
• (d) said fourth secondary windings or each of said first, second and third groups are all wound in the same sense as said fourth primary winding;
• (e) said fifth secondary windings of said first and second groups are wound in the same sense as said fifth primary winding whereas said fifth secondary winding of said third group is wound in the opposite sense of said fifth primary winding;
• (f) said sixth secondary winding of said first group is wound in the same sense as said sixth primary winding whereas said sixth secondary windings of said second and third groups are wound in the opposite sense to that of said sixth primary winding.