| 摘要 |
<p>A high frequency heating apparatus is realized by the more precise and simpler construction through the digital controlling operation of the momentary power-off detecting function, the start beginning time controlling function so as to protect the semiconductor switching elements (9) from the overload at the starting time. As a high frequency heating apparatus uses an inverter circuit as a boost power supply of the high frequency oscillator (5), the precise measurement of the power-off detection and the operation stop time may be effected, so that the semiconductor switching element (9) may be easily protected. Also, insulation between a system controlling portion (17) for controlling the operation switch (18) and the inverter controlling circuit (11) connected with the commercial power supply (1) may be retained, thus resulting in extremely high safety. Furthermore, as the cut-off of the major power supply circuit and the opening and closing detection of the door in the system controlling portion (17) may be effected by one door switching only, the price is lower and the operational property is superior. In addition, the opening and closing means of the major power supply circuit is provided in the system controlling portion (17) to improve the safety.</p> |
