| 摘要 |
PROBLEM TO BE SOLVED: To provide an inverter protector which can greatly downsize a circuit and reduce wasteful losses, and further can materialize energy saving. SOLUTION: The circuit can be greatly downsized, and further the loss by resistance can be removed, since the user is able to know the conditions of an AC power source, without providing an inverter device with a circuit for directly detecting voltage, by providing it with a rectifying circuit 2, an inverter 3, a brushless DC motor 5, a speed-detecting circuit 11 for detecting the rotational speed, a duty setting circuit 8 for adjusting the duty so that the rotational speed from the speed-detecting circuit 11 and the set speed conform with each other, a standard duty setting circuit 15 for setting the standard duty, according to the set speed, and a duty judging circuit 16 arranged so as to compare the present duty with the standard duty and stop the output of the inverter if it is outside a specified range. |
