| 摘要 |
PURPOSE:To stabilize the output of an electric blower, by triggering a trigger element when the voltage charged with a charging circuit exceeds the voltage around a trigger setting circuit in a vacuum cleaner controlled at the root of a hose, and by controlling the phase of a power control circuit with the trigger output of this trigger element. CONSTITUTION:The voltage at a power source 101 charges a capacitor 132 of a charging circuit 103 through a power synchronization rectification circuit 104. When the charging voltage of this capacitor 132 gets higher than the voltage set up around a trigger voltage setting circuit 107 based on the total resistance value of a resistor 136 and an operation circuit 110, a trigger element 106 turns ON. By turning ON this trigger element 106, the gate of a TRIAC 115 in a power control circuit 109 is triggered to turn ON the TRIAC 115, where the power is phase-controlled in accordance with the angle to turn ON and the output of an electric blower 57 is controlled. In this constitution the trigger control angle of a trigger element 106 can be made nearly constant even if the interruption due to imperfect contact is produced to the operation circuit 110, so that the output of the electric blower 57 will be stabilized. |
