| 摘要 |
PURPOSE:To detect the unbalanced voltage in an abnormal state in a simple circuit by connecting unbalanced current detecting means between the neutral point input terminal of an induction coil and the neutral point output terminal of the AC output terminal of an inverter. CONSTITUTION:When an inverter 2 is normally operated, a transistor Q is not conducted, and the output of a current detector 5 is outputted to abnormality identifying means 6 in the state that the output terminals 63, 64 are opened therebetween. When the output voltage waveform of the inverter 2 becomes abnormal, a transistor Q becomes the operating state, and the output of the current detector 5 is outputted to the means 6 in the state at the output terminals 63, 64 are shortcircuited. The means 6 inputs the shortcircuit output and notifies the malfunction of the inverter 2. |
