| 摘要 |
PROBLEM TO BE SOLVED: To stop inverter operation when a load is removed even if there is any parasitic capacitance that cannot be disregarded in the wiring path to the load, in an inverter device provided with a current feedback circuit, wherein its feedback loop is virtually interrupted when a load is removed. SOLUTION: A switching means 3 is connected so that switched voltage will be applied to the primary winding of an output transformer 4. The primary winding of a current transformer is inserted in series with a load connected to the secondary winding of the output transformer 4, and its secondary winding is connected to the control terminal on the switching beans 3 to from a reversed- polarity feedback means 7 that makes the switching means 3 self-oscillate by current feedback and is capable of offsetting the amount of feedback produced by a parasitic capacitance Cs in the wiring path when the load is removed. When the load is removed, the current feedback circuit 6 is virtually interrupted. If current feedback is performed by the parasitic capacitance Cs, however, it is offset by the reversed-polarity feedback means 7. |
