| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an inexpensive blower control device capable of controlling air quantity by a simple constitution without using an expensive inverter circuit. SOLUTION: This blower control device is provided with a pulse generating means (zero cross detection circuit 102) generating the pulses corresponding to the waveform position of an AC power supply driving blowers 12, 42, 52, a switching means (triac 103) performing on-off control of the supply of an AC power supply to the blowers and a control means (microcomputer 104) synchronizing the pulse from the pulse generating means and controlling the duty ratio turning the switching means on and off corresponding to the control quantities of the blowers.</p> |
