| 摘要 |
PROBLEM TO BE SOLVED: To provide a power supply device, which is capable of preventing an overvoltage from being applied to a motor when an AC voltage is 200 V, and a motor equipped with the power supply device.SOLUTION: When an AC voltage Vi is 200 V, 40 ms is taken by a detection voltage Vm at a voltage detection part 50 to rise to 2.8 V after the AC voltage Vi is supplied. During this time, a comparator 21 outputs High when the detection voltage Vm is lower than a threshold voltage Vs, and outputs Low when the detection voltage Vm is equal to or higher than the threshold voltage Vs. In this case, at output delay means 22, when 40 ms pass from a point of time when an AC voltage Ti is supplied, an input of a Schmitt circuit 24 becomes lower than a predetermined value, so Low is inputted into an OR circuit 25 and is outputted from an output terminal p of the OR circuit 25. Then, switch changeover means 26, to which Low is inputted, opens a switch 30 to thereby set a power supply device 1 as a full wave rectification circuit. |
