Matsushita Electric Industrial Co., Ltd.

Tatsuo Saka

Mitsuyuki Kiuchi

Hirokazu Yoshida

Takumi Mizukawa

Keizo Amagami

Hiroshi Fujieda

Masao Ito

Naoyoshi Maehara

Shunichi Nagamoto

Takashi Uno

Tetsu Kobayashi

Gas shut-off system

A microcomputer-controlled microwave oven including key switch inputs and voice synthesizer for conveying information to a user. The synthesizer is used in connection with a data input program to aid the user in inputting data via the key switches to avert errors in inputting data that may result in over-heating of food or a fire inside the oven's heating chamber.

Heating apparatus provided with a voice synthesizing circuit

Induction heating apparatus using gate-controlled switching devices includes a zero crossing point detector for detecting the occurrence of each zero crossing point of high frequency energization current, and a timing circuit which provides timing action in response to the detected zero crossing point. The timing action is controlled by a power control circuit which detects the level of energy delivered to a load within a range from the inherent turn-off time of the gate-controlled switching devices to a desired value.

Induction heating apparatus with means for detecting zero crossing point

The present disclosure relates to a power supplier for a magnetron for use in electric appliances, such as a microwave oven. The power supplier of the present disclosure has a solid state frequency converter which changes commercial A.C. power to A.C. power at a high frequency, which A.C. power is increased in voltage in a step-up transformer and then fed to the magnetron. The power supplier further has a control system which stabilizes the power to be applied to the magnetron with respect to a preselected reference level and a power supplier protecting circuit for protecting the power supplier from an unexpected low voltage occurring in the commercial power source.

Power supplier for magnetron

Growing community of inventors

Kadoma, Japan

Tatsuo Saka