| 摘要 |
PURPOSE:To obtain the always constant state in the finish of cooking independently of the input voltage by detecting the variation the power source voltage and selecting the electric power of a heater as input signal and varying the timer time, as for an electrical cooker such as oven toaster. CONSTITUTION:The differential voltage between the voltage of the first dc power source 15 which is formed by a reduced voltage means consisting of a diode 15 and a zenor diode as electric power source and the voltage of the second dc power source which is stabilized is detected as the variation of the power source voltage, and during the time when a relay contact point 13 is in closed state, the signal is read out. The heating electric power of a heater is kept constant independently of the power source voltage, by a selecting means 30 for the heater electric power according to the detection signal of the power source voltage, and the finished state of the cooking in a certain time is kept constant independently of the power source voltage. When the cooking time is short, the timer setting time is varied to keep the finished state constant. |
