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Angle grinder and electrical tool

A technology of angle grinding and capacitance, applied in angle grinding. field, able to solve problems such as power shocks and potential safety hazards

Active Publication Date: 2019-06-04
NANJING CHERVON IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the power supply voltage cannot reach the threshold of the comparator at the moment of power-on, it is still charged with a large current when power-on. At the moment of power-on, the power supply voltage will be directly loaded on both ends of the capacitor, causing the capacitor to generate an instantaneous current, which will bring to the power supply. shock
The instantaneous high current impact will form electric sparks on the power supply side, which will bring certain safety hazards

Method used

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  • Angle grinder and electrical tool
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  • Angle grinder and electrical tool

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Embodiment approach

[0107] Those skilled in the art should understand that the second condition here is independent of the power-on state or the first rotational speed of the electric tool. That is, in one embodiment of the present invention, no matter whether the electric tool is powered on or not, or whether the electric tool has the first rotating speed, the power switch tube can be activated accordingly by judging whether the electric tool meets the second condition. Q turns off or turns off gradually. For example, when the second condition is that the rotation speed of the motor reaches the second rotation speed, whether the motor reaches the second rotation speed can be judged independently without considering whether the electric tool is powered on or whether the first rotation speed is met, and through the control unit, Outputting a PWM duty ratio signal to control switching elements such as the power switch tube Q to turn off or gradually turn off, so that the capacitor circuit is in a d...

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Abstract

The invention discloses an angle grinder and an electrical tool. The electrical tool comprises a DC unit, a motor, a driving circuit, a capacitive circuit and a control unit, wherein the capacitive circuit comprises a switching element and a capacitor, and the control unit drives the switching element to realize the control over charge and discharge of the capacitor. The capacitive circuit is connected between the DC unit and the driving circuit, and can buffer the impact on the power side of the electrical tool during the power-on process, so that the electrical tool is compact in structure and its safety performance is improved.

Description

technical field [0001] The invention relates to the technical field of electric tools, in particular to an angle grinder. Background technique [0002] In order to meet the demand for stable output performance, existing electric tools such as angle grinders often adopt a design scheme with a large capacitor, resulting in a large size of the electric tool, which is not easy to carry and operate. [0003] U.S. patent application US 20170110935A1 discloses a capacitor circuit, which uses a comparator to judge whether the DC bus voltage collected by the sampling circuit reaches the threshold value, and then controls the discharge of the above-mentioned capacitor through the transistor when the threshold value is reached, but does not control the voltage when the power is turned on. The charging process is controlled. Since the power supply voltage cannot reach the threshold of the comparator at the moment of power-on, it is still charged with a large current when power-on. At t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/00B24B23/02B24B47/12
CPCB24B23/028B24B27/08B24B47/12B24B49/10H02M1/15H02M1/36H02M5/458H02M7/06H02M7/53871H02P6/00H02P6/06H02P6/08H02P27/08H02P25/03Y02P70/10B25F5/001H02P7/29
Inventor 陈伟鹏王宏伟
Owner NANJING CHERVON IND
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