Highfrequency heating apparatus using frequency-converter-type power supply.

摘要

A high-frequency heating apparatus comprises a power supply (1) including a commercial power supply or a battery, a frequency converter (29) for converting the power of the power supply into a high-frequency power, a boosting transformer (30) for increasing the voltage of the output of the frequency converter, and a magnetron (5) for receiving the output from the boosting transformer. The apparatus further comprises a shield member (37) made of a non-magnetic conductive material and forming a substantially electrical open loop in the direction of the primary winding between the primary and secondary windings of the boosting transformer. The shield member is connected to the core or the housing of the boosting transformer thereby to substantially contain a high-voltage circuit in a shield space. A high safety of a high-frequency heating apparatus is thus assured without grounding the housing.