阅读说明：本技术 电动工具及电动工具的控制方法 (Electric tool and control method thereof ) 是由 穆小涛 于 2020-11-23 设计创作，主要内容包括：一种电动工具,包括控制模块、连接所述控制模块的调速模块和开关电路以及连接所述开关电路的电机,所述控制模块接收所述调速模块输入的调速信号,并输出相应的占空比信号控制所述开关电路的占空比,以控制所述电机的转速,所述控制模块检测并判断所述调速模块输入的调速信号是否处于异常状态,所述控制模块在所述调速信号处于异常状态时,控制所述电机以预定的转速运转,本发明还提供一种应用于该电动工具的控制方法,该电动工具在调速模块出现异常或损坏,输出调速信号不稳定时,仍可以正常使用,不会出现失速的情况。(The invention also provides a control method applied to the electric tool, and the electric tool can be normally used and cannot stall when the speed regulating module is abnormal or damaged and the output speed regulating signal is unstable.)

1. The utility model provides an electric tool, includes control module, connects control module's speed governing module and switch circuit and connection switch circuit's motor, control module receives the speed governing signal of speed governing module input to output corresponding duty cycle signal control switch circuit's duty cycle, in order to control the rotational speed of motor, its characterized in that: the control module detects whether a speed regulating signal input by the speed regulating module is in an abnormal state, and controls the motor to run at a preset rotating speed when the speed regulating signal is in the abnormal state.

2. The power tool of claim 1, wherein: the speed regulation module comprises a potentiometer and a speed regulation switch for regulating the output voltage of the potentiometer, the speed regulation switch generates a primary stroke, the potentiometer outputs a primary continuous voltage signal, the potentiometer is connected to the control module, and the speed regulation signal received by the control module is the voltage signal output by the potentiometer.

3. The electric power tool according to claim 1 or 2, characterized in that: the control module receives a continuous speed regulating signal and sets the speed regulating signal as one operation of the speed regulating switch, and when the control module detects that the operation frequency of the speed regulating switch is greater than or equal to the rated use frequency of the speed regulating switch, the control module judges that the speed regulating signal is in an abnormal state and controls the motor to operate at a preset rotating speed.

4. The power tool of claim 3, wherein: the rated using times are from fifty thousand times to ten thousand times.

5. The power tool of claim 3, wherein: the electric tool also comprises a reset key, and the reset key is connected to the control module and used for controlling the operation times to be cleared.

6. The power tool of claim 2, wherein: the control module is provided with a preset voltage value, receives the voltage signal once continuously, detects more than three times of voltage jump exceeding the preset voltage value in the voltage signal once continuously, judges that the speed regulating signal is in an abnormal state and controls the motor to run at a preset rotating speed.

7. The electric power tool according to any one of claims 1 to 2 and 4 to 6, wherein: and the control module controls the motor to enter soft start and operate at a preset rotating speed when the speed regulating signal is in an abnormal state.

8. The electric power tool according to any one of claims 1 to 2 and 4 to 6, wherein: the control module sets the predetermined rotational speed to a maximum rotational speed of the motor.

9. The electric power tool according to any one of claims 1 to 2 and 4 to 6, wherein: the potentiometer is a carbon film strip potentiometer.

10. A control method of an electric tool, the electric tool comprises a control module, a speed regulation module and a switch circuit which are connected with the control module, and a motor which is connected with the switch circuit, the control module receives a speed regulation signal input by the speed regulation module and outputs a corresponding duty ratio signal to control the duty ratio of the switch circuit so as to control the rotating speed of the motor, and the control method of the electric tool is characterized by comprising the following steps: and detecting and judging whether a speed regulating signal input by the speed regulating module is in an abnormal state, if so, controlling the motor to run at a preset rotating speed, and otherwise, controlling the electric tool to normally work.

[ technical field ] A method for producing a semiconductor device

The invention relates to the technical field of electric tools, in particular to an electric tool and a control method thereof.

[ background of the invention ]

Electric tool is widely used in all trades, most electric tools have the speed governing function in order to adapt to user's demand, the user can be according to application scenario or self custom control electric tool's rotational speed, generally through speed governing switch transmission speed governing signal to the controller, the controller is given switch circuit according to predetermined duty ratio signal of control signal output, and then the rotational speed of control motor, but when speed governing switch reached life or produced the damage, the condition that can not correctly transmit speed governing signal to the controller probably appears, and then lead to the motor can not carry out the speed governing according to normal speed of setting for, cause the instrument stall to influence user's normal use.

Accordingly, there is a need for an improved power tool that overcomes the deficiencies of the prior art.

[ summary of the invention ]

In view of the defects of the prior art, the invention aims to provide an electric tool with a speed regulation module, which can be continuously and normally used when the speed regulation module is abnormal.

The technical scheme adopted by the invention for solving the problems in the prior art is as follows: the electric tool comprises a control module, a speed regulation module and a switch circuit which are connected with the control module, and a motor which is connected with the switch circuit, wherein the control module receives a speed regulation signal input by the speed regulation module and outputs a corresponding duty ratio signal to control the duty ratio of the switch circuit so as to control the rotating speed of the motor, the control module detects whether the speed regulation signal input by the speed regulation module is in an abnormal state, and when the speed regulation signal is in the abnormal state, the control module controls the motor to operate at a preset rotating speed.

Preferably, the speed regulation module comprises a potentiometer and a speed regulation switch for regulating the output voltage of the potentiometer, the speed regulation switch generates a primary stroke, the potentiometer outputs a primary continuous voltage signal, the potentiometer is connected to the control module, and the speed regulation signal received by the control module is the voltage signal output by the potentiometer.

Preferably, the control module receives a continuous speed regulating signal and sets the continuous speed regulating signal as one operation of the speed regulating switch, and when the control module detects that the operation frequency of the speed regulating switch is greater than or equal to the rated use frequency of the speed regulating switch, the control module judges that the speed regulating signal is in an abnormal state and controls the motor to operate at a preset rotating speed.

Preferably, the rated number of uses is from fifty thousand to ten thousand.

Preferably, the power tool further comprises a reset key, and the reset key is connected to the control module and used for controlling the operation times to be cleared.

Preferably, the control module is provided with a preset voltage value, receives the voltage signal continuously for one time, detects that more than three voltage jumps exceeding the preset voltage value occur in the voltage signal continuously for one time, judges that the speed regulating signal is in an abnormal state, and controls the motor to operate at a preset rotating speed.

Preferably, the control module controls the motor to enter soft start and operate at a preset rotating speed when the speed regulating signal is in an abnormal state.

Preferably, the control module sets the predetermined rotational speed to a maximum rotational speed of the motor.

Preferably, the potentiometer is a carbon film strip potentiometer.

In order to solve the problems in the prior art, the invention also provides a control method of an electric tool, the electric tool comprises a control module, a speed regulation module and a switch circuit which are connected with the control module, and a motor which is connected with the switch circuit, the control module receives a speed regulation signal input by the speed regulation module and outputs a corresponding duty ratio signal to control the duty ratio of the switch circuit so as to control the rotating speed of the motor, and the control method of the electric tool comprises the following steps: and detecting and judging whether a speed regulating signal input by the speed regulating module is in an abnormal state, if so, controlling the motor to run at a preset rotating speed, and otherwise, controlling the electric tool to normally work.

Compared with the prior art, the invention has the following beneficial effects: the control module detects that the speed regulating signal input by the speed regulating module is abnormal, neglects the speed regulating signal and directly controls the motor to run at a preset rotating speed, so that when the speed regulating module is abnormal or the output speed regulating signal is damaged and unstable, the electric tool can still be normally used, and the condition of stalling cannot occur.

[ description of the drawings ]

The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings:

FIG. 1 is a schematic diagram of the circuit configuration of the present invention;

FIG. 2 is a schematic flow chart of a first embodiment of the present invention;

FIG. 3 is a schematic flow chart of a second embodiment of the present invention;

FIG. 4 is a graph showing the relationship between the switch stroke and the voltage dividing signal when the speed regulation module is abnormal according to the second embodiment of the present invention;

FIG. 5 is a graph showing the relationship between the travel of the speed control switch and the voltage dividing signal when the speed control module is normal.

The meaning of the reference symbols in the figures:

100. the electric tool 10, the MCU controller 11, the voltage detection circuit 12, the speed regulation module 20, the switch circuit 21, the current detection circuit 30, the motor 31, the rotating speed detection module 40, the transformation module 200, the battery pack R1, the divider resistor R2, and the divider resistor

[ detailed description ] embodiments

The present invention will be described in further detail with reference to the accompanying drawings and embodiments.

As shown in fig. 1 and fig. 2, an electric tool 100 according to a first embodiment of the present invention is provided, where the electric tool 100 includes a control module, a speed regulation module 12 and a switch circuit 20 connected to the control module, and a motor 30 connected to the switch circuit 20, in this embodiment, the electric tool 100 is connected to a battery pack 200, the battery pack 200 supplies power to the motor 30, the control module includes an MCU controller 10, the electric tool 100 further includes a voltage transformation module 40, an input end of the voltage transformation module 40 is connected to an anode of the battery pack 200, and an output end of the voltage transformation module 40 is connected to the MCU controller 10 and the speed regulation module 12, so as to supply power to the MCU controller 10 and the speed regulation module 12; the MCU controller 10 receives the speed-adjusting signal input by the speed-adjusting module 12, and outputs a corresponding duty ratio signal to control the duty ratio of the switching circuit 20, so as to control the rotation speed of the motor 30.

The speed regulation module 12 comprises a potentiometer and a speed regulation switch for regulating the output voltage of the potentiometer, the potentiometer comprises two fixed ends and a sliding end, one end of the fixed end of the potentiometer is connected with the output end of the voltage transformation module 40, the other end of the fixed end of the potentiometer is grounded, the sliding end of the potentiometer is connected with the speed regulation switch, and a corresponding voltage signal is output to the MCU controller 10 according to the stroke of the speed regulation switch, and the speed regulation signal is the voltage signal; the switching circuit 20 includes a MOSFET connected to the MCU controller 10 and controlled by the MCU controller to be turned on and off, and the MCU controller 10 outputs a corresponding duty ratio signal to control the duty ratio of the switching circuit 20 after receiving the voltage signal, thereby controlling the rotation speed of the motor 30.

The MCU controller detects whether a speed regulating signal input by the speed regulating module 12 is in an abnormal state, and the MCU controller 10 controls the motor 30 to run at a preset rotating speed when the speed regulating signal is in the abnormal state; the MCU controller 10 receives a continuous voltage signal and sets the voltage signal as one operation of the speed regulation switch, when the MCU controller 10 detects that the operation frequency of the speed regulation switch is greater than or equal to the rated use frequency of the speed regulation switch, the voltage signal is judged to be in an abnormal state, the MCU controller 10 controls the motor 30 to enter soft start and operate at a preset rotating speed, in the embodiment, the MCU controller 10 sets the preset rotating speed as the maximum rotating speed of the motor 30, and when the MCU controller 10 detects that the operation frequency of the speed regulation switch is less than the rated use frequency of the speed regulation switch, the voltage signal is judged to be in a normal state, and the electric tool 100 is controlled to normally work.

When the MCU controller 10 detects that the operation frequency of the speed regulation module 12 is greater than or equal to the rated use frequency of the speed regulation switch, it determines that the voltage signal is abnormal, and directly controls the motor 30 to operate at a predetermined rotation speed by ignoring the voltage signal, so that the electric tool 100 can still be used normally after the speed regulation module 12 has reached the service life, and the stall condition does not occur.

Further, the MCU controller 10 is connected to a voltage detection circuit 11 for detecting the voltage of the battery pack 200, a current detection circuit 21 for detecting the current of the motor 30, and a rotation speed detection module 31 for detecting the rotation speed of the motor 30, wherein the voltage detection circuit 11 includes voltage dividing resistors R1 and R2 connected in series, the voltage dividing resistor R1 is connected to the positive electrode of the battery pack 200, the voltage dividing resistor R2 is grounded, and one end of the voltage dividing resistors R1 and R2 connected in series is connected to the MCU controller 10; the potentiometer is a carbon film potentiometer, and the rated use times are set to be fifty thousand to hundred thousand; the electric tool 100 further includes a reset key (not shown), where the reset key is connected to the MCU controller 10 and is used to control the operation times to be reset, and the reset key can be used to reset the operation times after the speed regulation module 12 of the electric tool 100 is replaced, so as to prevent the MCU controller 10 from continuously controlling the operation of the electric tool 100 on the original usage times of the speed regulation module 12.

The first embodiment of the present invention further provides a control method of an electric tool, the electric tool 100 includes a speed regulation module 12, a control module, a switching circuit 20 and a motor 30, the control module receives a speed regulation signal input by the speed regulation module 12 and outputs a corresponding duty ratio signal to control a duty ratio of the switching circuit 20 so as to control a rotation speed of the motor 30, the control method of the electric tool 100 includes the following steps: and detecting and judging whether the speed regulating signal input by the speed regulating module 12 is in an abnormal state, if so, controlling the motor 30 to operate at a preset rotating speed, and otherwise, controlling the electric tool 100 to normally work.

The second embodiment:

referring to fig. 5, it is shown that when the speed regulation module 12 is in normal use, the voltage signal increases with the increase of the speed regulation switch stroke, but when the speed regulation module 12 is abnormal, for example, when a carbon film strip of the carbon film potentiometer is worn, a resistance value of the carbon film potentiometer cannot be correctly changed according to the stroke of the speed regulation switch, the carbon film potentiometer cannot output the voltage signal correctly according to the stroke of the speed regulation switch, and the voltage signal shown in fig. 4 generates a downward spike, and the voltage signal has a voltage jump, the MCU controller 10 detects the wrong voltage signal, and the electric tool 100 cannot normally operate according to the operation of the speed regulation switch by a user.

As shown in fig. 1, 3, and 4, an electric power tool 100 according to a second embodiment of the present invention is different from the first embodiment in that: the electric tool 100 does not need to be provided with the reset key, the MCU controller 10 is provided with a predetermined voltage value, the MCU controller 10 receives the voltage signal continuously once and detects that more than three voltage jumps exceeding the predetermined voltage value occur in the voltage signal continuously once, the MCU controller 10 determines that the voltage signal is in an abnormal state, controls the motor 30 to enter a soft start and operate at a predetermined rotation speed, in the present embodiment, the voltage transformation module 40 outputs a voltage of +5V, one fixed end of the potentiometer is connected to the voltage of +5V, the other fixed end is grounded, the MCU controller 10 sets the predetermined voltage value to 2V, the MCU controller 10 receives the voltage signal continuously once and detects that the voltage signal has more than three voltage jumps of 2V within the voltage signal continuously once, the MCU controller 10 controls the motor 30 to enter soft start and operate at a predetermined rotational speed, in this embodiment, the MCU controller 10 sets the predetermined rotational speed as the maximum rotational speed of the motor 30.

The MCU controller 10 determines that the voltage signal is abnormal when detecting that the voltage signal has three voltage jumps of more than 2V within one continuous voltage signal, and directly controls the motor 30 to operate at a predetermined speed by ignoring the voltage signal, so that the electric tool 100 can still be used normally without stalling when the output voltage signal is unstable due to damage of the speed regulation module 12.

The present invention is not limited to the above-described embodiments. Those skilled in the art will readily appreciate that there are numerous alternatives to the power tool and the method of controlling the power tool of the present invention without departing from the spirit and scope of the invention. The protection scope of the present invention is subject to the content of the claims.