Title:
ALTERNATING-CURRENT ELECTRIC TOOL
Document Type and Number:
WIPO Patent Application WO/2021/135737
Kind Code:
A1
Abstract:
An alternating-current electric tool, comprising a functional element (10), a brushless motor (20) and a motor control circuit (30). The functional element is configured to realize the function of the electric tool; the brushless motor is configured to drive the functional element, and the brushless motor comprises a stator winding and a rotor; and the motor control circuit comprises: a power supply module (301), configured to be connected to an alternating current so as to supply power to the stator winding; a first rectifier module (302), configured to be connected to the alternating current to which the power supply module is connected and to output a direct-current bus voltage in an operable manner; a drive circuit (303), configured to drive the brushless motor; a controller (304), configured to control the drive circuit to drive the brushless motor to work; and a second rectifier module (306), electrically connected to the power supply module and configured to output the connected alternating current into a direct current so as to at least supply power to the controller. The power supply module is also connected to the second rectifier module, so that the weak current portion is not affected by fluctuation of a bus voltage, and the weak current portion supplies power stably, effectively avoiding the effect, on electronic devices, of a high voltage caused by unstable power supply of the weak current portion of the motor.
Inventors:
WANG HUAISHU (CN)
XU TIANXIAO (CN)
XU TIANXIAO (CN)
Application Number:
PCT/CN2020/131381
Publication Date:
July 08, 2021
Filing Date:
November 25, 2020
Export Citation:
Assignee:
NANJING CHERVON IND CO LTD (CN)
International Classes:
B24B23/02; H02M7/04; H02P6/08
Foreign References:
| CN108233785A | 2018-06-29 | |||
| CN106602897A | 2017-04-26 | |||
| CN205490201U | 2016-08-17 | |||
| CN101694969A | 2010-04-14 | |||
| CN208479171U | 2019-02-05 | |||
| CN201830193U | 2011-05-11 | |||
| US20180278192A1 | 2018-09-27 | |||
| US20110234140A1 | 2011-09-29 | |||
| US20140035492A1 | 2014-02-06 |
Attorney, Agent or Firm:
BEYOND ATTORNEYS AT LAW (CN)
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