Soft start device for electronic cutting machine tool
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United States of America Patent
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Dec 15, 2015
Grant Date -
Dec 3, 2015
app pub date -
Aug 19, 2014
filing date -
May 30, 2014
priority date (Note) -
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Abstract
A soft start device for a power cutting machine tool, a control circuit group includes two end, one of which is connected with an input power source and the other is connected with each of two control switches. When the input power source provides a working voltage for the control circuit group, the control circuit group outputs a low-level signal to the control switches to enable a light emitting circuit group to lighting gradually from dark to light, whereby a resistance of a trigger circuit group decreases gradually to make motor setup the working voltage. Next, the control circuit group outputs a high-level signal after a period of time, to turn on the control switches for inputting voltage to the motor directly. The soft start device can not only decrease the noise during activation of the motor but effectively protect the internal components of an electronic device from damage.
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