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Electric tool and control method thereof

A technology for power tools and control modules, which is applied in the direction of AC motor control, control systems, electrical components, etc., and can solve problems such as affecting the smooth rotation of the motor.

Active Publication Date: 2019-04-19
NANJING CHERVON IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] For electric tools that use AC as the power source, since the connected AC itself has a certain range of changes, even after rectification and amplitude modulation, the output voltage still has a certain range of changes. If the change is large, it will affect the smooth rotation of the motor.

Method used

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  • Electric tool and control method thereof
  • Electric tool and control method thereof
  • Electric tool and control method thereof

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Embodiment Construction

[0023] The present invention will be specifically introduced below in conjunction with the accompanying drawings and specific embodiments.

[0024] refer to figure 1 As shown, the electric tool of the present invention includes: a motor, a power supply module, a rectification module, a control module, and a drive module.

[0025] Wherein, the power module is used for accessing alternating current, more specifically, the power module can have a function of voltage transformation, which can be realized by setting two different coils.

[0026] The rectification module is used to convert the alternating current connected to the power supply module into direct current. Specifically, the rectification module may include a bridge rectification circuit, which can convert the alternating current input into the rectification module into direct current. The rectifier module has two input ends for connecting to alternating current, and the rectifier module has an output positive pole and...

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Abstract

The invention discloses an electric tool and a control method thereof. The electric tool comprises a motor, a power supply module, a rectifier module, a control module and a drive module, wherein the control module outputs a drive signal with a first duty ratio value when the rectifier module outputs a first voltage value; the control module outputs a drive signal with a second duty ratio value when the rectifier module outputs a second voltage value; and the first duty ratio value is smaller than the second duty ratio value when the first voltage value is greater than the second voltage value. According to the method, the control module outputs the drive signal with a relatively small duty ratio when output voltage of the rectifier module is relatively high; and the control module outputs the drive signal with a relatively large duty ratio when the output voltage of the rectifier module is relatively low. By the electric tool, the space occupied by components of the electric tool is saved when the motor can smoothly run under the condition of taking DC of changing voltage as a power supply.

Description

technical field [0001] The invention relates to an electric tool and a control method thereof. Background technique [0002] For electric tools that use AC as the power source, since the connected AC itself has a certain range of changes, even after rectification and amplitude modulation, the output voltage still has a certain range of changes. If the change is large, it will affect the smooth rotation of the motor. . Contents of the invention [0003] Electric tools, including: motor; power module, used to connect to AC power; rectifier module, used to convert the AC power connected to the power module into DC power; control module, used to send driving signals; Drive the motor under the control of the rectifier module; when the rectifier module outputs the first voltage value, the control module outputs the drive signal of the first duty ratio value; when the rectifier module outputs the second voltage value, the control module outputs the drive signal of the second dut...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/217H02P27/04
Inventor 陈武刘雷王宏伟
Owner NANJING CHERVON IND