| 摘要 |
PURPOSE: To obtain an inverter device which prevents the biased overcurrent of a transformer by providing a means by which the output voltage of the inverter device is simulated from the gate signal of a voltage-fed inverter and by which, when its integrated value exceeds a prescribed set value, the output of the voltage-fed inverter is made zero. CONSTITUTION: When a voltage-fed inverter No.1 and a voltage-fed inverter No.2 are operated normally, outputs of comparators 47a, 47c are set to '1', outputs of comparators 47b, 47d are set to '0', and respective gate signals which are decided by modulation circuits 46a, 46b are output. When a DC component is added to a voltage to be applied to a multiple transformer and aϕ1 is at a prescribed value of higher, the gate of a Y-phase GTO thyristor is turned off. In this case, the output of the comparator 47b is at '1', the gate signal of an X-phase GTP thyristor is not changed, and the output of the voltage-fed inverter No.1 becomes zero. Then, since signals e01 , e02 are increased, a voltage for an increase portion is shared by the voltage-fed inverter No.2, and an inverter device is operated in a direction in which a current is kept according to an instruction value.
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