| 摘要 |
PURPOSE: To prevent the malfunction of a system control unit, and to prevent the generation of electric shock accident of a user by providing a means for preventing the generation of the surge at the time of high-voltage operation and for preventing the leak current into a low-voltage operation unit. CONSTITUTION: When a user sets an optional cooking function such as high, medium or loro boiling of rice and heat insulation through a button operation unit 110, a system control unit 111 outputs the system control signal corresponding to the set function. This system control signal is input to a negative feedback amplifier 106 through a first and a second photo-couplers PC1, PC2 inside the high-voltage/low-voltage separating unit 113. Namely, since the photo- couplers PC1, PC2 transmit the system control signal, which is output from the system control unit 111, to the negative feedback amplifier 106 by the light emitting and the light receiving work, the system control unit 111 and the negative feedback amplifier 106 as a high voltage operation part can be electrically separated. |
