| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent excessive voltage from being applied to a control circuit side, and to power an actuator with a sufficient amount of voltage to it. <P>SOLUTION: A power circuit 36 is formed with a switch 36a for performing switching between power supply to a booster 36b as electric power from a boosting circuit 37 and electric power from a dry battery 34. The switch 36a consists of a diode D1 and a diode D2. Between the boosting circuit 37 and the switch 36a, a regulation IC36c is provided to regulate voltage (VCC2) supplied from the boosting circuit 37 below a prescribed value (2.5 V). Thus, failure due to overvoltage of a microcomputer 35 is prevented. In other words, the electric power from a series thermocouple 13 is boosted above the allowable voltage of the microcomputer 35, thereby supplying a sufficient amount of electric power to a fan 8. <P>COPYRIGHT: (C)2004,JPO |
