| 摘要 |
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. |
| 主权项 |
1. A soft start device applied to an electronic cutting machine tool, the machine tool having a motor, a cutting unit driven by the motor, and the soft start device connected with the motor, and the soft start device comprising a control circuit group, a first control switch, a second control switch, a light emitting circuit group, and a trigger circuit group;
wherein the control circuit group comprises a regulator circuit and a control circuit, an input power source being connected to an end of the regulator circuit and the motor, the other end of the regulator circuit being connected to the control circuit; when the input power source provides a working voltage for the control circuit, the control circuit outputs a low-level signal to the first control switch, a light emitting unit of the light emitting circuit group generates light fading up for gradually decreasing a resistance of a sensing unit of the trigger circuit group to make the working voltage of the motor increase gradually and make the second control switch turned-off; after a period of time, the control circuit outputs a high-level signal to the first control switch to make the second control switch turned on for inputting the voltage to the motor directly. |
