| 摘要 |
PURPOSE:To enable to adjust the output by detecting the voltage in coincidence with the detected comparison voltage through the change of the comparison voltage with on/off of the ladder circuit. CONSTITUTION:When a signal voltage 51 which is the off signal of freezing chamber cooling is selected, since the resistance value of a temperature sensor 7 is changed in following to the freezing chamber temperature, the signal voltage 51 is changed. The signal voltage 51 is given to a comparator 4 as a detected voltage 42. On the other hand, a comparison voltage 41 is changed through the combination of resistors R1-R5 of a ladder circuit with the operation of an operation circuit 3, and the combination of the resistors in the ladder circuit 6 at the coincidence voltage of the signal voltage 41=signal voltage 42, e.g. 00101 is written in a RAM incorporated in the operation circuit 3. If the code is in coincidence with the code 00101 registrated in a ROM for off voltage of the signal voltage 51 set at first, the cooling is made to off. But, the cooling of the freezing chamber is kept until the coincidence voltage of the detected voltage 42 is the voltage having the code registrated in ROM. That is, the control of cooling off is not made. |
