| 摘要 |
PURPOSE:To freely change a rise time of the amount of air blown into a compartment, by providing a control means in a fan control circuit, which means is interlocked with an air conditioning switch to gradually change a fan speed from 0 to a predetermined speed. CONSTITUTION:An operational amplifier circuit 19 connected with an air conditioning switch 16 is additionally provided in a fan control circuit. At the same time an ignition switch 15 is turned on, and the air conditioning switch 16 is turned on, current flows in a direction depicted by an arrow to operate the operational amplifier circuit 19. An input voltage V0 is added to a non-inversion input side, and negative feedback is conducted with a resistor R1 (voltage to be added to the resistor R1 is gradually increased) to thereby gradually increase the amount of air from 0. Accordingly, the amount of air approaches to an ordinary amount of air controlled by a fan controller 22 as time is elapsed. In other words, it is possible to freely change a rise time of the amount of air blown into a compartment by making the resistance of the resistor R1 variable. |
