Inverter

DETAILED DESCRIPTION It is an object of the present invention to provide an improved inverter which operates promptly and surely to reset the current transformer in the feedback circuit for transferring energy stored in the snubber back to the d.
c.
power source.
According to one aspect of the present invention, the inverter comprises at least a pair of arm elements, each consisting of a self turn-off switching device, forming positive and negative parts; a pair of reactors connected in series between the positive arm element and the negative arm element; first and second snubbers, each consisting of a serial connection of a snubber capacitor and a snubber diode, connected in parallel to the positive and negative arm elements, respectively; a current transformer having primary and secondary windings for retrieving energy stored in the snubbers; a closed circuit including the primary winding of the current transformer and a self turn-off switching device connected in series with each other, with one end of the circuit connected to the node of the diode and capacitor of the first snubber and with another end connected to the node of the diode and capacitor of the second snubber; a rectifying circuit for transferring energy retrieved on the secondary winding of the current transformer back to a d.
c.
power source; and a gate circuit which produces gate signals for turning on or off the arm switching devices and a gate signal for turning on and keeping on the switching device in the closed circuit for a period long enough to feed back energy stored in the snubber through the current transformer and rectifying circuit to the d.
c.
power source, and thereafter turning off the switching device, in correspondence to the on-off operation of the arm switching devices.