Inverter circuit with an improved inverter driving circuit

Abstract

An inverter circuit including an inverter driving circuit and a plurality of pairs of switching elements coupled to a DC power source. The inverter driving circuit includes first and second gate driving circuits. The first gate driving circuit with a pulse transformer is coupled to a first switching element of each pair of switching elements, the latter of which is coupled to the positive side of the DC power source. The second gate driving circuit uses a non-induction control device, and is coupled to a second switching element of each pair of switching elements, the latter of which is coupled to the negative side of the DC power source. The total number of power sources required for the inverter driving circuit can be greatly decreased by using first gate driving circuits requiring no power source, as compared with that of a conventional inverter driving circuit constituted only by second gate driving circuits. A faster response speed for preventing damage to switching elements can be achieved by using second gate driving circuits having a fast response speed, as compared with that of a conventional inverter driving circuit constituted only by first gate driving circuits. Further, even if chopping is conducted, a high inverter efficiency can be obtained.

Dependencies are inferred from the claim text.