公开(公告)号：US20180034388A1

公开(公告)日：2018-02-01

申请号：US15657484

申请日：2017-07-24

Applicant: MAKITA CORPORATION

Inventor： Yuki KAWAI ,  Itsuku KATO

IPC: H02P1/02 ,  H02M7/06 ,  H02M1/36 ,  H03K5/1536 ,  H03K17/567

CPC classification number: H02P1/022 ,  H02H9/002 ,  H02M1/36 ,  H02M7/062 ,  H02P6/20 ,  H02P29/0241 ,  H03K5/1536 ,  H03K17/567

Abstract: An electric working machine according to one aspect of the present disclosure comprises a motor, a rectifier circuit, a capacitor, a series switching element, a resistive element, a drive circuit, a peak voltage value acquirer, and a controller. The capacitor smooths power rectified by the rectifier circuit. The series switching element is coupled in series with the capacitor. The resistive element is coupled in parallel with the series switching element. The controller brings the series switching element into conduction in a case where AC power is inputted to the rectifier circuit and where a specified conducting condition based on a peak voltage value acquired by the peak voltage value acquirer is satisfied.

公开(公告)号：US20150137717A1

公开(公告)日：2015-05-21

申请号：US14540707

申请日：2014-11-13

Applicant: MAKITA CORPORATION

Inventor： Goshi ISHIKAWA ,  Itsuku KATO

IPC: H02P3/12

CPC classification number: H02P3/12 ,  B25F5/00

Abstract: One aspect of an embodiment of the present disclosure is a braking apparatus for an electric power tool that includes a switching circuit with six switching elements and a brake control unit. The brake control unit switches any one selected switching element of three switching elements forming one selected switch group of a high-side switch group and a low-side switch group to an off state from an on state at a timing at which braking current flows through a diode connected in parallel to the selected switching element upon turn-off of the selected switching element.

Abstract translation: 本公开的实施例的一个方面是一种用于电动工具的制动装置，其包括具有六个开关元件的切换电路和制动控制单元。 制动控制单元将在制动电流流过的定时处，将形成高侧开关组和低侧开关组的一个选择的开关组的三个开关元件的任何一个选择的开关元件从接通状态切换 在选择的开关元件断开时与所选择的开关元件并联连接的二极管。