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A high-frequency heating apparatus comprises a power supply including a commercial power supply or a battery, a frequency converter for converting the power of the power supply into high-frequency power, a boosting transformer for increasing the voltage of the output of the frequency converter, and

A high-frequency heating apparatus comprises a power supply including a commercial power supply or a battery, a frequency converter for converting the power of the power supply into high-frequency power, a boosting transformer for increasing the voltage of the output of the frequency converter, and a magnetron for receiving the output from the boosting transformer. The apparatus further comprises a shield member made of a non-magnetic conductive material and forming a substantially electrical open loop in the winding 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 substantially containing a high-voltage circuit in the shield space. High safety of the high-frequency heating apparatus is thus assured without grounding the housing.

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A high-frequency heating apparatus comprising a power supply supplied with electric power from a selected one of a commercial power supply and a battery; a frequency converter for converting the power of the power supply into high-frequency power; a boosting transformer for increasing the voltage of

A high-frequency heating apparatus comprising a power supply supplied with electric power from a selected one of a commercial power supply and a battery; a frequency converter for converting the power of the power supply into high-frequency power; a boosting transformer for increasing the voltage of the output of the frequency converter, said boosting transformer having a window-frame-shaped core made of a magnetic conductive material, a primary winding and a secondary winding wound around a portion of said core, said primary and secondary windings being adjacent to each other; a magnetron energized by the output of the boosting transformer; and a shield member made of a non-magnetic conductive material, said shield member having at least one slit extending in a direction transverse to the winding direction of said primary winding to provide a substantially electrically open loop in the winding direction of the primary winding between the primary and secondary windings, said slit having a width smaller in the winding direction of said primary winding than twice the shortest distance between said shield member and said primary winding.