HIGH VOLTAGE DC PULSE GENERATING CIRCUIT FOR PRIMARY CONTROLLED GAS LASER

PURPOSE:To easily acquire insulation distance on the occasion of loading of a ballast resistor by inserting a resistor in series to an inverter switch circuit and a booster transformer and causing it to function as a ballast resistor which stabilizes control of negative resistance region of gas laser load. CONSTITUTION:A series resistor 4 inserted in series between an inverter switch circuit 3 and a booster transformer 5 becomes equivalent to insertion of a ballast resistor 7 having a resistance value of almost n times the value of the resistor 4 when a winding ratio of the primary and secondary windings of booster transformer is set to 1:n. As explained above, it is possible to cause a series resistor 4 to function by eliminating entire part or a part of the ballast resistor 7. Moreover, since a seried resistor 4 is inserted to the primary side (low voltage side) of the booster transformer 5, a small size and economical one may be used, realizing drastic reduction in size and economization of apparatus and remarkable saving of mounting space.