CN110871422A - Electric tool with restart prevention function - Google Patents
Electric tool with restart prevention function Download PDFInfo
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- CN110871422A CN110871422A CN201810992332.0A CN201810992332A CN110871422A CN 110871422 A CN110871422 A CN 110871422A CN 201810992332 A CN201810992332 A CN 201810992332A CN 110871422 A CN110871422 A CN 110871422A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
Abstract
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.
Description
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 restart prevention module 100, a switch 200, a control module 300, a motor 400, and a driving module 500.
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 anti-restart module 100 and the first end of the switch 200, and the negative electrode is connected to the second end of the anti-restart module 100. In this embodiment, the dc power source may be a battery pack or other dc power sources, that is, the electric tool provided in the embodiment of the present application is an electric tool that can access the dc power source. The switch 200 is used to connect a power input to the control module 300 and the motor 400 so that the power supply supplies power to the control module 300 and the motor 400.
The control module 300 is configured to send a motor driving signal to the driving module 500. The first end of the control module 300 is connected to the second end of the switch 200, and is configured to be connected to a dc power source through the switch 200, when the switch 200 is closed, the dc power source can supply power to the control module 300, and when the switch is disconnected, the control module 300 is disconnected from the dc power source. The second terminal of the control module 300 is connected to the third terminal of the anti-restart module 100, and is configured to receive the first indication signal or the second indication signal output by the anti-restart module 100. The third terminal of the control module 300 is connected to the motor 400 for controlling the working state of the motor according to the received indication signal outputted by the restart prevention module 100. In this embodiment, the control module 300 may be any programmable controller, and the first input terminal, the second input terminal, and the third input terminal of the control module 300 may be a plurality of general input/output interfaces of the controller.
Further, the power tool further includes a driving module 500 connected between the control module 300 and the motor 400. The first end of the driving module 500 is connected to the third end of the control module 300, and the second end of the driving module 500 is connected to the motor 400, and is configured to receive a motor driving signal of the control module 300 and control the operating state of the motor 400.
When the switch 200 is closed and the dc power is connected to the power input terminal, the anti-restart module 100 outputs a first indication signal. The control module 300 receives the first indication signal output by the restart prevention module 100 and controls the motor 400 not to operate.
When the dc power supply is connected to the power input terminal and the switch 200 is closed, the anti-restart module 100 outputs a second indication signal. The control module 300 receives the second indication signal output by the restart prevention module 100 and controls the motor 400 to operate.
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 restart prevention module 100 includes a charging unit 110 and a voltage dividing unit 120. The charging unit 110 and the voltage dividing unit 120 are connected in series and then connected in parallel to two ends of the power input terminal. Specifically, a first terminal of the charging unit 110 is connected to a positive terminal of the power input terminal, and a second terminal of the charging unit 110 is connected to a first terminal of the voltage dividing unit 120. The second terminal of the voltage dividing unit 120 is connected to the negative terminal of the power input terminal. In this embodiment, the negative electrode of the power input terminal may be grounded. The charging unit 110 is configured to generate a voltage when a dc power supply is connected, and the voltage dividing unit 120 is configured to output a first indication signal or a second indication signal according to the voltage generated by the charging unit 110.
When the switch 200 is closed and then the dc power is applied, the charging unit 110 is in a fast charging state and supplies a voltage varying with time to the voltage dividing unit 120. The voltage dividing unit 120 responds to the time-varying voltage and outputs a first indication signal, and the control module 300 controls the motor 400 not to operate according to the first indication signal after receiving the first indication signal. When the switch 200 is turned on after the dc power is first turned on, the capacitor charging unit 110 is in a charging completion state and simultaneously provides a constant voltage to the voltage dividing unit 120, the voltage dividing unit 120 responds to the constant voltage and outputs a second indication signal, and the control module 300 controls the motor 400 to operate according to the second indication signal after receiving the second indication signal.
In this embodiment, the first indication signal and the second indication signal may be voltage signals, and the control module 300 may control the operating state of the motor 400 according to the magnitude of the voltage signals. For example, if the voltage is less than or equal to zero, the control module 300 controls the motor 400 to operate, and if the voltage is greater than zero, the control module 300 controls the motor 400 not to operate. It will be appreciated that if the voltage is too high, the control module 300 may process the voltage signal to stabilize the voltage within the operating voltage range of the control module.
In one embodiment, the anti-restart module 100 may further include a voltage stabilizing unit 130, where the voltage stabilizing unit 130 is connected in parallel with the voltage dividing unit 120 and configured to conduct in a reverse direction under the action of the time-varying voltage output by the charging unit, so as to stabilize the time-varying voltage within a signal voltage range that the control module 300 can receive.
A common connection point a of the first terminal of the voltage stabilizing unit 130 and the output terminal of the voltage dividing unit 120 may serve as a third terminal of the restart prevention module 100. The third terminal is connected to a second input terminal of the control module 300. When the voltage stabilizing unit 130 is turned on reversely, the voltage across the voltage stabilizing unit 130 is the first indication signal, and the control module 300 receives the first indication signal and controls the motor 400 not to operate.
Referring to fig. 2, in an embodiment of the present application, the restart protection module 100 further includes a discharging unit 140, a first end of the discharging unit 140 is connected to the first end of the charging unit 110, a second end of the discharging unit 140 is connected to the second end of the voltage dividing unit 120, the discharging unit 140 forms a loop with the capacitor charging unit 110 and the voltage dividing unit 120, and the discharging unit 140 can discharge charges in the charging unit 110 to the ground since the second end of the voltage dividing unit 120 is grounded.
In one embodiment, the charging unit 110 includes at least one capacitor, and the voltage dividing unit 120 includes at least one resistor. When the charging unit 110 includes a capacitor and the voltage dividing unit 120 includes a resistor, the resistor is connected in series with the capacitor. When the charging unit 110 includes a plurality of capacitors and the voltage dividing unit 120 includes a plurality of resistors, the plurality of capacitors are connected in parallel with each other, and the plurality of resistors are connected in series with the parallel capacitors.
Referring to fig. 3, in one embodiment, the discharge unit 140 includes a resistor R1; the charging unit 110 comprises a capacitor C1 and a capacitor C2; the voltage divider 120 includes a resistor R2 and a resistor R3.
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 voltage divider 120. The second terminal of the resistor R2 and the second terminal of the resistor R1 are grounded. In this embodiment, the capacitance of the capacitor C1 and the capacitance of the capacitor C2 may be the same.
The voltage stabilizing unit 130 includes a voltage stabilizing diode D1. 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. In this embodiment, a common connection point a between a cathode of the zener diode D1, the first end of the resistor R2, and the second end of the resistor R3 is a third end of the anti-restart module 100. The third end can be connected with a control module of the electric tool, and meanwhile, the anti-restarting module is also connected with a switch of the electric tool, and the switch is connected with the control module. The control module can control whether the motor is started or not according to the received voltage of the output end, namely whether the electric tool is started or not is controlled. In this embodiment, the resistance of the resistor R2 is greater than the resistance of the resistor R3.
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 switch 200. 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 voltage divider 120. The second terminal of the resistor R2 and the second terminal of the resistor R1 are grounded. In this embodiment, the capacitance of the capacitor C1 and the capacitance of the capacitor C2 may be the same, and the resistance of the resistor R2 is greater than the resistance of the resistor R3.
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 control module 300 of the power tool. The third input terminal of the control module 300 is connected to the first terminal of the driving module 500, and the second terminal of the driving module 500 is connected to the motor 400. Meanwhile, the charging unit 110 of the restart prevention module 100 is also connected to the switch 200 of the power tool. Specifically, a first terminal of the switch 200 is connected to a first terminal of the capacitor C1 and a first terminal of the capacitor C2, and a second terminal of the switch 200 is connected to a first input terminal of the control module 300 and the motor 400, respectively.
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 control module 300 and the motor 400 through a switch, and the control module 300 is in a working state and can detect the voltage of the output end of the anti-restart module. At the moment when the dc power is connected to the circuit, the dc power can be regarded as an instantaneous pulse, and the instantaneous pulse can pass through the capacitor C1 and the capacitor C2, and the capacitor C1 and the capacitor C2 to be in a fast charging state, so that the charging unit 120 outputs a voltage varying with time, and the voltage varying with time is directly applied to the resistor R3 and the resistor R2. A first voltage is developed across resistor R2, and it should be understood that the voltage at common node a is the first voltage. The cathode of the zener diode D1 is connected to the common node a, and since the first voltage is larger, the zener diode D1 is broken down under the effect of the first voltage, and the zener diode D1 stabilizes the voltage of the common node a at around the breakdown voltage, so that the voltage of the common node a becomes the breakdown voltage of the zener diode, that is, the second voltage, where the second voltage is the aforementioned first indication signal. The control module 300 of the electric tool receives the second voltage, that is, the state of the electric tool is determined as that the switch is closed and then the power supply is connected, and then the control module 300 controls the motor 400 not to operate by controlling the driving module 500, so as to prevent potential safety hazards.
The switch 200 is then turned off and the control module 300 is reset if there is no power in the circuit. And then the switch is closed, at this time, the direct current power supply is connected to the restart prevention module, the capacitor C1 and the capacitor C2 are in a charging completion state, and direct current cannot pass through the capacitor C1 and the capacitor C2 due to the blocking and alternating current characteristics of the capacitor C1 and the capacitor C2, so that a parallel branch of the capacitor C1 and the capacitor C2 outputs a constant voltage with zero potential. Since the anti-restart module is in an open circuit state, the voltage of the first end of the resistor R2 is zero, and the zener diode cannot be broken down, the voltage of the third end of the anti-restart module is zero, that is, the anti-restart module outputs the second indication signal. The control module 300 of the electric tool detects the zero potential at the output end of the restart prevention module, and determines that the state at this moment is that the power supply is firstly switched on and then the switch is closed, and then the control module 300 controls the motor 400 to operate by controlling the driving module 500.
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 control module 300 is powered by a dc power source. At the moment the dc power is connected to the circuit, the control module 300 may start to operate. As can be seen from the figure, when the switch is closed first and then the power supply is connected, at the moment of connecting the dc power supply, the third terminal of the restart-prevention module outputs the high voltage, and after the moment, the high voltage gradually decreases with time until it becomes zero. Meanwhile, the control module 300 may operate at the moment of accessing the dc power, that is, the control module 300 may detect the voltage of the third terminal of the anti-restart module. Since the third terminal of the restart prevention module outputs a high level, the control module 300 controls the motor not to operate according to the received high level, so as to prevent accidental injury to the operator.
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.
Claims (9)
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.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810992332.0A CN110871422B (en) | 2018-08-29 | 2018-08-29 | Electric tool with restart prevention function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810992332.0A CN110871422B (en) | 2018-08-29 | 2018-08-29 | Electric tool with restart prevention function |
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| CN110871422A true CN110871422A (en) | 2020-03-10 |
| CN110871422B CN110871422B (en) | 2021-05-14 |
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| CN201810992332.0A Active CN110871422B (en) | 2018-08-29 | 2018-08-29 | Electric tool with restart prevention function |
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| JPH08336779A (en) * | 1995-06-09 | 1996-12-24 | Hitachi Koki Co Ltd | Power tool control device |
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| CN110871422B (en) | 2021-05-14 |
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