Electric tool with restart prevention function
阅读说明:本技术 具备防重启功能的电动工具 (Electric tool with restart prevention function ) 是由 陆骏 姚凯 张雷雷 于 2018-08-29 设计创作,主要内容包括:本发明涉及一种具有防重启功能的电动工具,包括防重启模块,当先闭合开关再将直流电源接入电源输入端时,所述防重启模块输出第一指示信号,电动工具的控制模块检测到所述防重启模块输出的第一指示信号时,不输出电机驱动信号,电机不运转;当先将直流电源接入电源输入端再闭合开关时,所述防重启模块输出第二指示信号,电动工具的控制模块检测到所述防重启模块输出的第二指示信号时,控制模块输出电机驱动信号,驱动模块控制电机运转。上述电动工具的控制模块可根据防重启模块输出的指示信号判断电动工具的状态,进而控制电机的工作状态,可防止电动工具在先接入直流电源再闭合开关时直接重启,对操作者产生误伤害,提高了电动工具的安全性能。(The invention relates to an electric tool with a restart prevention function, which comprises a restart prevention module, wherein when a switch is closed firstly and then a direct current power supply is connected to a power supply input end, the restart prevention module outputs a first indication signal, and when a control module of the electric tool detects the first indication signal output by the restart prevention module, a motor driving signal is not output, and a motor does not run; when the direct-current power supply is connected to the power supply input end and then the switch is closed, the restart prevention module outputs a second indication signal, and when the control module of the electric tool detects the second indication signal output by the restart prevention module, the control module outputs a motor driving signal and the driving module controls the motor to operate. The control module of the electric tool can judge the state of the electric tool according to the indication signal output by the restart prevention module, further control the working state of the motor, prevent the electric tool from being restarted directly when the electric tool is connected with a direct current power supply before and then the switch is closed, generate error injury to an operator and improve the safety performance of the electric tool.)
1. An electric tool with restart prevention function comprises,
a motor;
the control module is used for sending a motor driving signal;
the driving module is used for receiving the motor driving signal to control the motor to operate;
the power supply input end is used for accessing a direct current power supply;
a switch for connecting the DC power source to the control module and the motor;
the method is characterized in that: the electric tool also comprises a restart prevention module, when the switch is closed firstly and then the direct current power supply is connected to the power supply input end, the restart prevention module outputs a first indication signal, when the control module detects the first indication signal output by the restart prevention module, a motor driving signal is not output, and the motor does not run;
when the direct-current power supply is connected to the power supply input end and then the switch is closed, the restart prevention module outputs a second indication signal, when the control module detects the second indication signal output by the restart prevention module, the control module outputs a motor driving signal, and the driving module controls the motor to operate.
2. The power tool with the restart prevention function according to claim 1, wherein the power input terminal comprises a positive electrode and a negative electrode, and the positive electrode is connected to the first terminal of the restart prevention module, and the negative electrode is connected to the second terminal of the restart prevention module;
the restart-prevention module is also provided with a third end which is used for connecting the control module and outputting the first indication signal or the second indication signal to the control module.
3. The electric tool with the restart prevention function according to claim 2, wherein the restart prevention module comprises a charging unit for generating a voltage when the dc power supply is connected; the voltage division unit is used for outputting the first indication signal or the second indication signal according to the voltage generated by the charging unit; the charging unit is electrically connected with the anode of the power input end and the voltage division unit respectively;
when the switch is closed first and then the direct-current power supply is connected, the charging unit is in a rapid charging state and provides voltage changing along with time for the voltage dividing unit, and the voltage dividing unit responds to the voltage changing along with time and outputs the first indicating signal;
when the switch is closed after the direct-current power supply is connected, the charging unit is in a charging completion state and provides constant voltage for the voltage dividing unit, and the voltage dividing unit responds to the constant voltage and outputs the second indicating signal.
4. The electric tool with restart prevention function according to claim 3, wherein the restart prevention module comprises a voltage stabilizing unit connected in parallel to two ends of the voltage dividing unit and configured to conduct in a reverse direction under the effect of the time-varying voltage so as to stabilize the time-varying voltage to a signal voltage range that can be received by the control module.
5. The electric tool with the restart prevention function as claimed in claim 4, wherein the restart prevention module further comprises a discharging unit electrically connected to the charging unit and the voltage dividing unit, respectively, for discharging the electric charge stored in the charging unit.
6. The power tool of claim 5, wherein the voltage dividing unit includes at least one resistor, and the charging unit includes at least one capacitor;
when the charging unit comprises a capacitor, the at least one resistor is connected with the capacitor in series;
when the capacitor charging unit comprises a plurality of capacitors, the plurality of capacitors are connected in parallel, and the at least one resistor is connected in series with the plurality of capacitors connected in parallel.
7. The electric tool with the restart prevention function as claimed in claim 6, wherein the discharging unit comprises a resistor R1, the charging unit comprises a capacitor C1 and a capacitor C2, and the voltage dividing unit comprises a resistor R2 and a resistor R3;
the first end of the resistor R1, the first end of the capacitor C1 and the first end of the capacitor C2 are connected with the positive electrode of the power input end and one end of the switch, the second end of the capacitor C1 and the second end of the capacitor C2 are connected with the first end of the resistor R3, the second end of the resistor R3 is connected with the first end of the resistor R2, and the second end of the resistor R2 and the second end of the resistor R1 are connected with the negative electrode of the power input end.
8. The electric power tool with restart prevention function of claim 7, wherein the capacitance C1 is the same as the capacitance C2.
9. The electric tool with restart prevention function of claim 8, wherein the voltage regulator unit comprises a zener diode D1, the zener diode D1 is connected in parallel to two ends of the resistor R2, wherein a cathode of the zener diode D1 is connected to a first end of the resistor R2 and a second end of the resistor R3 respectively, and serves as the third end of the restart prevention module, and an anode of the zener diode D1 is connected to a second end of the resistor R2.
Technical Field
The invention relates to the technical field of restart prevention, in particular to an electric tool with a restart prevention function.
Background
With the progress of science and technology, electric tools are widely used, and safety problems are not negligible in the use process of the electric tools. Generally, when the power tool is in normal operation, the power tool is stopped when a sudden power failure occurs, and the switch of the power tool is still in a closed state. When the user inserts electric tool into the power again under the state of not knowing, because electric tool's switch has closed, lead to electric tool directly to restart, the user is wounded by mistake probably, produces the potential safety hazard.
Disclosure of Invention
Therefore, it is necessary to provide an electric tool with a restart prevention function to solve the problem that a power supply is easily connected to the electric tool when a switch of the electric tool is closed, thereby causing a potential safety hazard.
An electric tool with a restart prevention function comprises a motor; the control module is used for sending a motor driving signal; the driving module is used for receiving the motor driving signal to control the motor to operate; the power supply input end is used for accessing a direct current power supply; a switch for connecting the DC power source to the control module and the motor; the electric tool also comprises a restart prevention module, when the switch is closed firstly and then the direct current power supply is connected to the power supply input end, the restart prevention module outputs a first indication signal, when the control module detects the first indication signal output by the restart prevention module, a motor driving signal is not output, and the motor does not run; when the direct-current power supply is connected to the power supply input end and then the switch is closed, the restart prevention module outputs a second indication signal, when the control module detects the second indication signal output by the restart prevention module, the control module outputs a motor driving signal, and the driving module controls the motor to operate.
In one embodiment, the power input end comprises a positive pole and a negative pole, and the positive pole is used for connecting a direct current power supply, the positive pole is connected with the first end of the restart prevention module, and the negative pole is connected with the second end of the restart prevention module;
the restart-prevention module is also provided with a third end which is used for connecting the control module and outputting the first indication signal or the second indication signal to the control module.
In one embodiment, the restart prevention module comprises a charging unit for generating voltage when the direct current power supply is connected; the voltage division unit is used for outputting the first indication signal or the second indication signal according to the voltage generated by the charging unit; the charging unit is electrically connected with the anode of the power input end and the voltage division unit respectively;
when the switch is closed first and then the direct-current power supply is connected, the charging unit is in a rapid charging state and provides voltage changing along with time for the voltage dividing unit, and the voltage dividing unit responds to the voltage changing along with time and outputs the first indicating signal;
when the switch is closed after the direct-current power supply is connected, the charging unit is in a charging completion state and provides constant voltage for the voltage dividing unit, and the voltage dividing unit responds to the constant voltage and outputs the second indicating signal.
In one embodiment, the restart prevention module includes a voltage stabilizing unit, and the voltage stabilizing unit is connected in parallel to two ends of the voltage dividing unit and is configured to conduct in a reverse direction under the effect of the time-varying voltage, so as to stabilize the time-varying voltage to a signal voltage range that can be received by the control module.
In one embodiment, the restart prevention module further includes a discharging unit electrically connected to the charging unit and the voltage dividing unit, respectively, for releasing the charges stored in the charging unit.
In one embodiment, the voltage dividing unit comprises at least one resistor, and the charging unit comprises at least one capacitor;
when the charging unit comprises a capacitor, the at least one resistor is connected with the capacitor in series;
when the capacitor charging unit comprises a plurality of capacitors, the plurality of capacitors are connected in parallel, and the at least one resistor is connected in series with the plurality of capacitors connected in parallel.
In one embodiment, the discharge unit comprises a resistor R1, the charge unit comprises a capacitor C1 and a capacitor C2, and the voltage division unit comprises a resistor R2 and a resistor R3;
the first end of the resistor R1, the first end of the capacitor C1 and the first end of the capacitor C2 are connected with the positive electrode of the power input end and one end of the switch, the second end of the capacitor C1 and the second end of the capacitor C2 are connected with the first end of the resistor R3, the second end of the resistor R3 is connected with the first end of the resistor R2, and the second end of the resistor R2 and the second end of the resistor R1 are connected with the negative electrode of the power input end.
In one embodiment, the capacitance C1 is the same as the capacitance C2.
In one embodiment, the voltage regulator unit includes a zener diode D1, the zener diode D1 is connected in parallel to two ends of the resistor R2, wherein a cathode of the zener diode D1 is connected to a first end of the resistor R2 and a second end of the resistor R3 respectively, and serves as the third end of the anti-restart module, and an anode of the zener diode D1 is connected to a second end of the resistor R2.
The control module can judge whether the electric tool is switched on again after the switch is switched on or switched on again after the direct current power supply is switched on, and then controls the working state of the motor according to the judgment result, so that the electric tool can be prevented from being directly restarted when the electric tool is switched on again before the direct current power supply is switched on, the error injury is caused to an operator, and the safety performance of the electric tool is improved.
Drawings
FIG. 1 is a schematic view of a power tool module provided in accordance with an embodiment of the present application;
FIG. 2 is a schematic view of a power tool module provided in accordance with yet another embodiment of the present application;
FIG. 3 is a circuit diagram of a restart prevention module according to an embodiment of the present application;
FIG. 4 is a circuit diagram of a restart prevention module according to yet another embodiment of the present application;
FIG. 5 is a schematic view of a power tool provided in an embodiment of the present application;
fig. 6 is a voltage profile obtained by simulation according to the schematic diagram of fig. 5.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 1, an embodiment of the present application provides an electric tool with a restart prevention function, which includes a power input terminal, a
The power input end comprises a positive pole and a negative pole and is used for being connected with a direct current power supply. The positive electrode is connected to the first end of the
The
Further, the power tool further includes a
When the
When the dc power supply is connected to the power input terminal and the
It is understood that the power tool further includes other circuit modules, which are well known to those skilled in the art and will not be described herein.
The electric tool with the restart-prevention function comprises the restart-prevention module, the restart-prevention module is connected to two ends of the power input end, the output end of the restart-prevention module is connected with the control module, and two ends of the switch are connected with the restart-prevention module and the control module. When the switch is closed firstly and then the direct current power supply is connected to the power supply input end, the anti-restarting module outputs a first indicating signal, the control module receives the first indicating signal, the state of the electric tool can be judged to be that the switch is closed firstly and then the direct current power supply is inserted, and then the control module controls the motor not to run. And only when the switch is closed after the direct-current power supply is accessed, the restart prevention module outputs a second indication signal, and the control module controls the motor to operate after receiving the second indication signal at the moment of closing the switch. The electrician's tool that possesses function of preventing restarting that this embodiment provided is owing to adopted the module of preventing restarting, and control module can judge according to the signal of preventing restarting the module output whether electric tool inserts DC power supply earlier or inserts DC power supply earlier and then closes the switch, and then according to the operating condition of judgement result control motor, can prevent that electric tool from directly restarting when inserting DC power supply earlier and then closing the switch, produces the mistake injury to the operator, has improved electric tool's security performance.
In one embodiment, please refer to fig. 2, the
When the
In this embodiment, the first indication signal and the second indication signal may be voltage signals, and the
In one embodiment, the
A common connection point a of the first terminal of the
Referring to fig. 2, in an embodiment of the present application, the
In one embodiment, the charging
Referring to fig. 3, in one embodiment, the
The capacitor C1 is connected in parallel with the capacitor C2 and then connected in series with the resistors R2 and R3. The resistor R1 is connected in parallel with a series branch formed by the capacitor C1, the capacitor C2, the resistor R2 and the resistor R3. Specifically, a first end of the resistor R1, a first end of the capacitor C1, and a first end of the capacitor C2 are connected to the positive terminal of the power input terminal. The second end of the capacitor C1 and the second end of the capacitor C2 are connected to the first end of the resistor R3. The second end of the resistor R3 is connected to the first end of the resistor R2. The connection point between the second end of the resistor R3 and the first end of the resistor R2 is the output end of the
The
It will be appreciated that in other embodiments, the charging unit may comprise a capacitor. Referring to fig. 4, the charging unit includes a capacitor C3, and a capacitor C3 is connected in series with a resistor R2 and the resistor R3. The resistor R1 is connected in parallel with a series branch formed by the capacitor C3, the resistor R2 and the resistor R3. The first end of the resistor R1 and the first end of the capacitor C3 are connected to the positive pole of the power input terminal. The second end of the capacitor C3 is connected to the first end of the resistor R3. The second end of the resistor R3 is connected to the first end of the resistor R2. The second terminal of the resistor R2 and the second terminal of the resistor R1 are grounded. In practical application, the number and capacity of capacitors in the charging unit and the number and resistance of resistors in the voltage dividing unit can be selected according to the requirements of customers, the response time of the anti-restart module can be shortened by optimizing the capacity of the capacitors and the resistance of the voltage dividing resistors, and the quick-response anti-restart function is realized.
Based on the above embodiment, the circuit shown in fig. 3 is applied to the electric power tool, and as shown in fig. 5, the capacitor C1 is connected in parallel with the capacitor C2 and then connected in series with the resistors R2 and R3. The resistor R1 is connected in parallel with a series branch formed by the capacitor C1, the capacitor C2, the resistor R2 and the resistor R3. The first end of the capacitor R1, the first end of the capacitor C1 and the first end of the capacitor C2 are respectively connected to the positive electrode of the power input terminal and the first end of the
The zener diode D1 is connected in parallel across the resistor R2. The cathode of the zener diode D1 is connected to the first end of the resistor R2 and the second end of the resistor R3, respectively, and the anode of the zener diode D1 is connected to the second end of the resistor R2. The common connection point a of the cathode of the zener diode D1, the first terminal of the resistor R2 and the second terminal of the resistor R3 is the output terminal. The output is connected to a first input of a
Based on the above embodiment, the working principle of the electric tool corresponding to fig. 5 is as follows:
when the switch is closed first, the anti-restart module is connected into a circuit of the electric tool. Then, the power input end is connected to a direct current power supply, the direct current power supply supplies power to the
The
Referring to fig. 6, fig. 6 is a voltage curve diagram obtained by simulation in a state that the switch is closed and then the power supply is connected according to the circuit diagram shown in fig. 5. Wherein, L1 is a voltage curve of the dc power supply, and L2 is a third terminal voltage curve of the anti-restart module. The horizontal axis represents time, and the vertical axis represents voltage. The
The electric tool comprises the restart prevention module, and the restart prevention module is simple in circuit structure, easy to realize and low in cost. The response speed of the circuit can be improved by configuring the capacity of the capacitor in the charging unit and the resistance value of the resistor in the voltage dividing unit, and the control is convenient. The control module of the electric tool can judge the state of the electric tool by judging the potential state of the output end of the restart prevention module so as to control whether the electric tool is started or not. If the output end of the restart prevention module outputs high potential, the control module judges that the state of the electric tool is that the switch is closed firstly and then the direct current power supply is connected, and the control module controls the motor not to work so as to prevent the user from being hurt. And only after the direct-current power supply is connected firstly and then the switch is closed, the restarting prevention module outputs low level, and then the control module controls the motor to work. The safety of the electric tool is improved due to the arrangement of the anti-restarting module.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
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