| 摘要 |
PURPOSE:To lower voltage of a noise terminal having a controlling circuit as a noise source by connecting points at the same voltage as the points to which a GND lead of an inverter circuit and a controlling circuit are connected through a resistor additionally to the GND lead connecting the inverter circuit and the controlling circuit. CONSTITUTION:Additionally to a GND lead 12 connecting the periphery of an emitter of a switching device of an inverter circuit and a GND of a controlling circuit 11, a GND having stable voltage against ground in a part except a part of a loop in which a high frequency current flows and the GND of the controlling circuit 11 is connected with a relatively small resistor. A lead 13 which connect the GND of the controlling circuit 11 and the GND of the inverter circuit through the relatively small resistor works to stabilize the voltage of the GND of the controlling circuit 11 against ground and weakens the function of the controlling circuit as a noise source. Consequently, voltage increase of a noise terminal is suppressed even when a part of the controlling circuit 11 such as a power setting and displaying unit of a built-in type induction heat cooking appliance is separated from a controlling circuit main body and connected with the main body by a long lead wire. |
