| 摘要 |
PURPOSE:To reduce an electric current flowing in a coil, and restrain generation of heat by preventing such a phenomenon that overvoltage is generated or an excessive resonance current is made to flow to a switching element in simple circuit constitution when abnormality is caused in a load in a resonance type inverter device. CONSTITUTION:A series circuit of diodes D3 and D4 is reversely connected in parallel across a DC electric power supply E, and a series circuit of impedance elements Z1 and Z2 to divide on abnormal voltage generated in a resonance type inverter circuit A when a load is abnormal, is provided, and a connecting poing of the impedance elements Z1 and Z2 and a connecting point of the diodes D3 and D4 are connected to each other. Thereby, since the abnormal voltage is divided by the impedance elements Z1 and Z2 and an electric current caused by overvoltage is returned to the DC electric power supply E through the diodes D3 and D4, the overvoltage and overcurrent can be prevented, and generation of heat of a coil can be also restrained. |
