High-frequency heating apparatus and cooling system for magnetron-driving power supply utilized in the apparatus

A high-frequency heating apparatus comprising:

• a magnetron-driving power supply including:
• a semiconductor rectifier element for rectifying the commercially available electric power;
• semiconductor switching elements for converting the rectified power into high-frequency power;
• and
• a high-voltage transformer for converting the high-frequency power into high voltage and thereby supplying the power to a magnetron;
• controlling means which has a microcomputer and thereby control the magnetron-driving power supply and the entirety of the apparatus;
• and
• temperature sensors for detecting the temperature of the semiconductor rectifier device and the semiconductor switching elements in the magnetron-driving power supply;
• and
• wherein on the basis of the information from the temperature sensors, the controlling means reduces the output of the inverter power supply, or alternatively terminates the operation of high-frequency heating.

A high-frequency heating apparatus comprising:

• a magnetron-driving power supply including:
• a semiconductor rectifier element for rectifying the commercially available electric power;
• semiconductor switching elements for converting the rectified power into high-frequency power;
• and
• a high-voltage transformer for converting the high-frequency power into high voltage and thereby supplying the power to a magnetron;
• controlling means which has a micro computer and thereby controls the output of the inverter power supply and the entirety of the apparatus;
• temperature sensors for detecting the temperature of the semiconductor rectifier device and the semiconductor switching elements in the magnetron-driving power supply;
• and
• notifying means for notifying an abnormality in the magnetron-driving power supply;
• and
• wherein the controlling means detects an abnormality in the magnetron-driving power supply by means of the temperature sensors, thereby terminates the operation of high-frequency heating, and notifies about the abnormality by means of the notifying means.

A high-frequency heating apparatus comprising:

• a heating chamber for containing a heating target;
• means for heating the target of heating;
• means for cooling the heat generation of a power supply apparatus;
• an automatic cooking detection sensor for determining the heating state of the target of heating and thereby controlling the method of heating;
• a micro computer for determining the signal and controlling the power;
• and
• an apparatus for detecting the temperature change in cooling air provided in the vicinity of a cooling air inlet;
• and
• wherein, by the apparatus for detecting the temperature change, the cooling air cools components including high self-heat generation in the power supply apparatus and the automatic cooking detection sensor and controls the power depending on the temperature change in order to protect the power supply apparatus from overheating and secure the detection performance of the automatic cooling detection sensor.