Electric Tool Control Circuit
AssigneeSuzhou Cleva Electric Appliance Co., Ltd.
InventorFufei Wu
Life of this patent
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Abstract
An electric tool control circuit includes a central control module, a motor drive module, a motor, and a working parameter detection module. The working parameter detection module can detect and communicate a parameter to the central control module related to a load on the motor detected during running of the motor. The motor drive module is separately electrically connected to the motor by using first and second switch modules, and the motor drive module controls the first and second modules to be discontinuously on and off to thereby reduce variation of a speed of the motor caused by a variation of the load on the motor. The status of the first and second switch modules being on and off are always contrary. A related method is disclosed.
Claims20
An electric tool control circuit comprising:
- a motor;
- a central control module, a motor drive module, a working parameter detection module, a first switch module, and a second switch module;
- the central control module being electrically connected to the motor drive module, and the central control module controlling turn on and off of the motor drive module;
- and
- the working parameter detection module being electrically connected to the motor and the central control module, the working parameter detection module detecting and communicating a parameter to the central control module, the parameter being related to a load on the motor detected during running of the motor, the motor drive module being electrically connected to the motor by a first switch module and a second switch module, the motor drive module controlling the first and second switch modules to be discontinuously on and off to thereby reduce variation of a speed of the motor caused by a variation of the load on the motor, the respective statuses of the first switch module and the second switch module being on and off are always contrary so that when the first switch module is on, the second switch module is off, and when the first switch module is off, the second switch module is on.
A method of controlling a speed of a motor of a tool having a central control module, a motor drive module, a working parameter detection module, a first switch module, and a second switch module, the method including the steps of:
- controlling a turning on and a turning off of the motor drive module using the central control module;
- detecting a parameter related to a load on the motor during running of the motor using the working parameter detection module, communicating the parameter detected to the central control unit using the working parameter detection module, the motor drive module being electrically connected to the motor by a first switch module and a second switch module;
- and
- controlling the first and second switch modules using the motor drive module to be discontinuously on and off to thereby reduce variation of a speed of the motor caused by a variation of the load on the motor, the controlling step including setting respective on and off statuses of the first switch module and the second switch module to always be opposite so that when the first switch module is on, the second switch module is off, and when the first switch module is off, the second switch module is on.
Dependencies are inferred from the claim text.