| 摘要 |
PURPOSE:To actuate the load for a fixed time with reduction of the power consumption and also attaining an OFF state for the power supply of a microcomputer even in case the microcomputer runs away, by turning off the power supply of the microcomputer in a fixed time after an operation switch is turned off. CONSTITUTION:When the operation switches 5 and 6 are turned off while a burner is burning, a fan motor has a post-purge and both transistors TR 3 and 11 are kept ON. when the post-purge is through, the output of a fan motor of a microcomputer 4 and a TR array 32 are turned off. While a fan motor drive relay 34 and a TR 17 are turned on with the TR 13 and 11 turned off. Thus the power supply of the computer 4 is turned off. If the computer 4 runs away while the switch 5 or 6 is kept ON, a TR 22 is turned off by the reset signal of a monitor circuit 29 for runaway of microcomputer power supply and then reset. Then the power supply of the computer 4 can be turned off like the runaway of the computer 4 caused during the post-purge by turning off the switches 5 and 6. |
