CN114598186B - Electric tool and electric tool starting method - Google Patents
Electric tool and electric tool starting method Download PDFInfo
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- CN114598186B CN114598186B CN202011431392.9A CN202011431392A CN114598186B CN 114598186 B CN114598186 B CN 114598186B CN 202011431392 A CN202011431392 A CN 202011431392A CN 114598186 B CN114598186 B CN 114598186B
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000005284 excitation Effects 0.000 claims abstract description 17
- 239000003990 capacitor Substances 0.000 claims description 48
- 238000006243 chemical reaction Methods 0.000 claims description 36
- 230000001360 synchronised effect Effects 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 3
- 238000004804 winding Methods 0.000 description 14
- 238000007599 discharging Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000007858 starting material Substances 0.000 description 3
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/02—Details
- H02P1/04—Means for controlling progress of starting sequence in dependence upon time or upon current, speed, or other motor parameter
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/02—Details
- H02P1/022—Security devices, e.g. correct phase sequencing
Abstract
The embodiment of the invention discloses an electric tool and an electric tool starting method. The electric tool includes: the motor is used for driving the electric tool to work; the driving circuit is connected with the motor and used for outputting an excitation signal to drive the motor to rotate; further comprises: the device comprises a power switch, a limit switch and a controller; the power switch is connected to the output end of the power supply and used for controlling the power supply output of the power supply; one end of the limit switch is connected with the controller, and the other end of the limit switch is connected with the set voltage; the controller is also connected with the driving circuit and the power switch respectively, and the controller is configured to: acquiring a first switching signal of a power switch and a second switching signal of a limit switch; if the power switch is determined to be closed based on the first switch signal, judging whether the limit switch is in a closed state or not based on the second switch signal; and if the limit switch is in a closed state, controlling the driving circuit to drive the motor to rotate. The problem of limit switch inefficacy and mistake start electric tool is solved.
Description
Technical Field
The embodiment of the invention relates to the technology of electric tools, in particular to an electric tool and an electric tool starting method.
Background
The limit of the reciprocating saw to the trigger switch is generally realized by using a mechanical structure, when the limit switch is closed, the trigger switch can be normally pressed down, and when the limit switch is opened, the trigger switch cannot be pressed down.
However, after the machine is used for a long time, the mechanical structure is at risk of failure, so that when the limit switch is disconnected, the trigger switch can be pressed down, and the machine is started accidentally.
Disclosure of Invention
The embodiment of the invention provides an electric tool and an electric tool starting method, which improve the safety of the electric tool.
In a first aspect, an embodiment of the present invention provides a power tool including:
the motor is used for driving the electric tool to work;
the driving circuit is connected with the motor and is used for outputting an excitation signal to drive the motor to rotate;
further comprises: the device comprises a power switch, a limit switch and a controller;
the power switch is connected to the output end of the power supply and used for controlling the power supply output of the power supply;
one end of the limit switch is connected with the controller, and the other end of the limit switch is connected with a set voltage;
the controller is also connected with the driving circuit and the power switch respectively, and the controller is configured to:
acquiring a first switching signal of the power switch and a second switching signal of the limit switch;
if the power switch is determined to be closed based on the first switch signal, judging whether the limit switch is in a closed state or not based on the second switch signal;
and if the limit switch is in a closed state, controlling the driving circuit to drive the motor to rotate.
Optionally, the method further comprises:
the protection capacitor is connected in parallel with the two ends of the power supply;
when the power switch is in a closed state, the power switch, the capacitor and the power supply form a first loop;
and when the power switch is in an off state, the power switch and the capacitor form a second loop.
Optionally, the positive electrode of the power supply is connected with the first wiring terminal of the power supply switch through a first connecting wire, the first end of the protection capacitor is connected with the second wiring terminal of the power supply switch through a second connecting wire, and the second end of the protection capacitor is connected with the negative electrode of the power supply;
the power supply device further comprises a third connecting wire and a discharge resistor, one end of the third connecting wire is connected with a third wiring end of the power supply switch, the other end of the third connecting wire is connected with one end of the discharge resistor, and the other end of the discharge resistor is connected with a second end of the protection capacitor;
when the first wiring terminal and the second wiring terminal are conducted, the power switch is in a closed state, and the protection capacitor, the power switch and the power supply form the first loop through the first connecting wire and the second connecting wire;
when the third wiring terminal and the second wiring terminal are conducted, the power switch is in an off state, and the protection capacitor, the power switch and the discharge resistor form the second loop through the second connecting wire and the third connecting wire.
Optionally, a fourth connecting line is further included;
one end of the fourth connecting wire is connected with the positive electrode of the power supply, and the other end of the fourth connecting wire is connected with a preset part of the electric tool; one end of the second connecting wire, which is connected with the protective capacitor, is also connected with the preset component;
the controller is further configured to:
detecting whether the power-on signals of the fourth connecting wire and the second connecting wire are synchronous or not;
and if the power-on signals of the fourth connecting wire and the second connecting wire are not synchronous, controlling the driving circuit to drive the motor to rotate.
Optionally, the preset component is a power conversion module; the input end of the power conversion module is connected with the second connecting wire, and the output end of the power conversion module is connected with the controller;
the power conversion module is used for outputting a set voltage when the power switch is in a closed state.
Optionally, one end of the limit switch is connected with a preset port of the controller, and the other end of the limit switch is connected with an output end of the power conversion module, so that the set voltage is obtained through the power conversion module;
when the preset port of the controller detects the set voltage, the controller determines that the limit switch is in a closed state.
Optionally, the power supply further comprises a diode connected with the power supply switch in parallel, and the cathode of the diode is connected with the input end of the power supply switch, wherein the input end of the power supply switch is connected with the positive electrode of the power supply.
Optionally, the controller is further configured to:
and if the limit switch is in an off state, controlling the driving circuit to stop outputting an excitation signal so as to inhibit the motor from rotating.
In a second aspect, an embodiment of the present invention further provides a method for starting an electric tool, which is applied to the electric tool according to any embodiment of the present invention, where the method includes:
acquiring a first switching signal of a power switch and a second switching signal of a limit switch;
if the power switch is determined to be closed based on the first switch signal, judging whether the limit switch is in a closed state or not based on the second switch signal;
and if the limit switch is in a closed state, controlling the driving circuit to drive the motor to rotate.
Optionally, after the determining whether the limit switch is in the closed state based on the second switch signal, the method further includes:
and if the limit switch is in an off state, controlling the driving circuit to stop outputting an excitation signal so as to inhibit the motor from rotating.
Optionally, one end of the limit switch is connected with a preset port of the controller, and the other end of the limit switch is connected with an output end of the power conversion module, so that the set voltage is obtained through the power conversion module; the judging whether the limit switch is in a closed state based on the second switch signal comprises:
when the preset port detects the set voltage, determining that the limit switch is in a closed state;
otherwise, determining that the limit switch is in an off state.
According to the electric tool provided by the embodiment of the invention, the limit switch is arranged in the electric tool, one end of the limit switch is connected with the set voltage signal, and the other end of the limit switch is connected with the controller, so that the controller can judge the opening and closing states of the limit switch based on whether the limit switch has an electric feedback signal or not. If the controller detects that the power switch is closed, the controller automatically detects the opening and closing states of the limit switch, and only when the controller detects that the limit switch is in the closed state, the controller allows starting operation of the motor, otherwise, even if the power switch is closed, the controller prohibits starting of the motor. Therefore, the open-close state of the limit switch is judged by the controller through the electric feedback signal, the accuracy of judging the open-close state of the limit switch is improved, and compared with the condition that the limit switch of the existing mechanical structure is easy to fail after being used for a certain time, the open-close state of the limit switch in the embodiment is not misjudged, and therefore the problem that an electric tool is started due to mistriggering caused by the failure of the limit switch is solved.
Drawings
FIG. 1 is a block diagram of an electric tool according to an embodiment of the present invention;
FIG. 2 is a block diagram of another power tool according to an embodiment of the present invention;
fig. 3 is a flowchart of a method for starting an electric tool according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Fig. 1 is a block diagram of an electric tool according to an embodiment of the present invention. The electric tool is not limited to an electric drill, a grinder, a screwdriver, a sanding machine and the like, and the electric tool driven by the brushless motor can adopt the technical scheme provided by the embodiment of the invention. Referring to fig. 1, the power tool includes: motor 10, drive circuit 20, controller 30, power switch K0 and limit switch K1.
The motor 10 includes a stator winding and a rotor. In some embodiments, the motor 10 is a three-phase brushless motor 10 including a rotor with permanent magnets and electronically commutated three-phase stator windings U, V, W. In some embodiments, a star connection is used between the three-phase stator windings U, V, W, and in other embodiments, an angular connection is used between the three-phase stator windings U, V, W. However, it must be understood that other types of brushless motors are also within the scope of the present disclosure. The number of stator windings in a brushless motor may include fewer or more than three phases.
A driving circuit 20 connected to the motor 10 for supplying an excitation signal to the motor 10. The drive circuit 20 switches the state of energization to each phase winding of the motor 10 and controls the current to each phase winding to rotationally drive the motor 10. The order and timing of the conduction of the windings of the motor 10 phases depends on the position of the rotor. In order to rotate the motor 10, the driving circuit 20 has a plurality of driving states, in which a stator winding of the motor 10 generates a magnetic field, and the controller 30 outputs control signals based on different rotor positions to control the driving circuit 20 to switch the driving states to rotate the magnetic field generated by the stator winding so as to drive the rotor to rotate, thereby realizing the driving of the motor 10. In this embodiment, the driving circuit 20 is configured to output an excitation signal for controlling the motor 10 to run down and brake to the stator phase winding of the motor 10 under the action of a control signal output from the controller 30.
In some embodiments, the input side of the driving circuit 20 is connected to the converted dc voltage signal of the power source E of the electric tool, the control end of the driving circuit 20 is connected to the controller 30, and the controller 30 outputs the control signal to make the driving circuit 20 distribute the power of the dc voltage of the input side to each phase winding on the stator of the motor 10 in a certain logic relationship, so as to start the motor 10 and generate continuous torque.
The controller 30 is connected to the driving circuit 20 and is used for outputting a control signal to the driving circuit 20. Optionally, the electric tool further includes a driving chip for controlling the on or off state of the electronic switch in the driving circuit 20. The driving chip is connected in series between the controller 30 and the driving circuit 20, and controls the on or off state of the electronic switch in the driving circuit 20 according to the control signal from the controller 30. In some embodiments, the control signal from the controller 30 is a PWM control signal. In this embodiment, the driver chip is shown as being separate from the controller 30. In other embodiments, the driver chip and the controller 30 may be integrated as a single body.
In the present embodiment, the controller 30 is also connected to the driving circuit 20 and the power switch K0, respectively, and the controller 30 is configured to:
acquiring a first switching signal of a power switch K0 and a second switching signal of a limit switch K1;
if the power switch K0 is determined to be closed based on the first switch signal, judging whether the limit switch K1 is in a closed state or not based on the second switch signal;
if the limit switch K1 is in the closed state, the driving circuit 20 is controlled to drive the motor 10 to rotate.
In this embodiment, the limit switch K1 may play a role in protecting the power tool during power-on, that is, only when the limit switch K1 is closed, the power-on operation is allowed to be performed, otherwise, the power-on operation of the power tool is prohibited.
In this embodiment, the on/off state (on/off state) of the limit switch K1 is detected by the controller 30 based on the electrical feedback signal, specifically, one end of the limit switch K1 is connected to the set voltage, the other end is connected to the controller 30, when the limit switch K1 is turned on, the controller 30 can detect the set voltage signal through the port connected to the limit switch K1, and when the limit switch K1 is turned off, the port connected to the limit switch K1 by the controller 30 cannot detect the voltage signal. Based on this principle, when the controller 30 detects that the port connected to the limit switch K1 has a set voltage signal, it is determined that the limit switch K1 is in a closed state, and conversely, if the controller 30 detects that the port connected to the limit switch K1 has no set voltage signal (power down), the controller 30 determines that the limit switch K1 is in an open state at this time. Obviously, compared with the limit switch K1 of the existing mechanical mechanism, the service life of the limit switch K1 in the embodiment is greatly prolonged, and the condition of use failure is not easy to occur; and the limiting function of the limit switch K1 is automatically controlled by an electric signal, so that compared with the limit switch K1 with a mechanical structure, the reliability of the limit switch K1 is greatly improved. The controller 30 intervenes in the operation of the starter motor 10 according to the on-off state of the limit switch K1.
Alternatively, in some embodiments, the open/closed state of the limit switch K1 may also be detected by a sensor. The sensor is connected to the controller 30, and the sensor feeds back the open/close state of the limit switch K1 to the controller 30.
The power switch K0 is connected to the output end of the power source E and is used for controlling the power supply output of the power source E, i.e. the power switch K0 can disconnect the current path of the power source E flowing to the motor 10. When the power switch K0 is turned on, the current path of the power source E to the motor 10 is opened, and at this time, the controller 30 decides whether to start the motor 10 according to the state of the limit switch K1.
If the controller 30 detects that the limit switch K1 is closed at this time, the controller 30 allows the operation of starting the motor 10 to be performed, i.e., the controller 30 instructs the driving circuit 20 to supply an excitation signal to the motor 10 at a certain power by outputting a control signal to the driving circuit 20 to drive the motor 10 to rotate. If the controller 30 detects that the limit switch K1 is in the open state at this time, the controller 30 prohibits the operation of the starter motor 10 although the power switch K0 is already closed.
Illustratively, if the controller 30 detects that the limit switch K1 is in the off state, the controller 30 outputs a control signal for turning off the switching device in the driving circuit 20, so that the driving circuit 20 stops outputting the excitation signal to the motor 10, and the motor 10 is disabled from starting. When the controller 30 detects that the limit switch K1 is closed, the controller 30 outputs another control signal for instructing the switching devices in the driving circuit 20 to conduct in a certain order to supply the voltage signal on the input side of the motor 10 to the motor 10 with a certain power (determined according to the duty ratio of the control signal), thereby driving the motor 10 to rotate.
According to the electric tool provided by the embodiment of the invention, the limit switch K1 is configured in the electric tool, one end of the limit switch K1 is connected with the set voltage signal, and the other end of the limit switch K1 is connected with the controller 30, so that the controller 30 can judge the opening and closing states of the limit switch K1 based on whether the limit switch K1 has an electric feedback signal or not. If the controller 30 detects that the power switch K0 is turned on, the controller 30 automatically detects the open/close state of the limit switch K1, and the controller 30 allows the start operation of the motor 10 only when detecting that the limit switch K1 is turned on, otherwise, the controller 30 prohibits the start of the motor 10 even if the power switch K0 is turned on. Therefore, by judging the open-close state of the limit switch K1 through the electric feedback signal by the controller 30, the accuracy of judging the open-close state of the limit switch K1 is improved, compared with the situation that the limit switch K1 with the existing mechanical structure is easy to lose the limit function after being used for a certain time, the open-close state of the limit switch K1 in the embodiment is not misjudged, and therefore the problem that the electric tool is started by mistake due to the failure of the limit switch K1 is solved.
Optionally, on the basis of the above technical solution, the controller 30 is further configured to:
if the limit switch K1 is in the off state, the control drive circuit 20 pauses outputting the excitation signal to prohibit the motor 10 from rotating.
When the limit switch K1 is in the off state, the working condition corresponds to that the user does not operate the electric tool according to the specification, and the operation of the current start motor 10 is an incorrect operation, and the controller 30 prohibits the start of the electric tool.
For example, the controller 30 may output a control signal for turning off an electronic switch in the driving circuit 20, so that the driving circuit 20 is prohibited from providing an excitation signal to the motor 10 and the motor 10 is prohibited from being started. It can be seen that under this condition, even though the current paths between the power source E and the motor 10 are already turned on, the motor 10 is not started because the excitation signal cannot be obtained under the control of the controller 30. The present embodiment prevents the motor 10 from being started by the controller 30 performing the soft operation based on the open-close state of the limit switch K1, avoiding the situation that the motor 10 is started by false triggering.
Alternatively, fig. 2 is a block diagram of another electric tool according to an embodiment of the present invention. On the basis of the above embodiment, reference is made to fig. 2. The power tool further includes: the protection capacitor C is connected in parallel with two ends of the power supply E;
when the power switch K0 is in a closed state, the power switch K0, the capacitor and the power supply E form a first loop;
when the power switch K0 is in an off state, the power switch K0 and the capacitor form a second loop.
When the power switch K0 is closed, the power switch K0 conducts the connecting branch of the power supply E and the protection capacitor C, the protection capacitor C and the power supply E form a first loop, the power supply E outputs, and the protection capacitor C can filter voltage signals output by the power supply E and filter cultural wave interference.
When the power switch K0 is turned off, the connection branch of the protection capacitor C and the power supply E is turned off, and the power switch K0 and the protection capacitor C form a second loop, and at this time, the electric quantity stored in the protection capacitor C is released through the second loop. The advantage of this arrangement is that the electric quantity of the protection capacitor C is released when the electric tool is turned off due to the existence of the second loop, so that when the operator performs normal power-off operation, the battery pack charges the protection capacitor C preferentially through the first loop formed by the power switch K0 when the operator performs power-on again, and power-on protection of the electric tool is realized under the action of the protection capacitor C.
According to the embodiment, the loop of the power switch K0 in the open state and the loop of the power switch K0 in the close state are arranged, so that the protection capacitor C is discharged in the open state, and when the power switch K0 is in the close state, the protection capacitor C is charged by the power supply E, and therefore the power-on protection of the electric tool under the conditions of normal power-off and power-on can be performed by utilizing the charge and discharge characteristics of the protection capacitor C, and the starting safety of the electric tool is improved.
Alternatively, based on the above embodiment, reference is continued to fig. 2. The positive electrode of the power supply E is connected with a first wiring terminal 1 of the power switch K0 through a first connecting wire L1, the first end of the protection capacitor C is connected with a second wiring terminal 2 of the power switch K0 through a second connecting wire L2, and the second end of the protection capacitor C is connected with the negative electrode of the power supply E;
the device further comprises a third connecting line L3 and a discharge resistor, one end of the third connecting line L3 is connected with a third wiring terminal 3 of the power switch K0, the other end of the third connecting line L3 is connected with one end of the discharge resistor, and the other end of the discharge resistor is connected with a second end of the protection capacitor C;
when the first wiring terminal 1 and the second wiring terminal 2 are conducted, the power switch K0 is in a closed state, and the protection capacitor C, the power switch K0 and the power supply E form a first loop through the first connecting line L1 and the second connecting line L2;
when the third terminal 3 and the second terminal 2 are turned on, the power switch K0 is turned off, and the protection capacitor C forms a second loop with the power switch K0 and the discharge resistor through the second interconnection line L2 and the third interconnection line L3.
In this embodiment, the discharging resistor R specifically performs a discharging operation on the protection capacitor C, specifically, when the power switch K0 is in an off state, the second connecting line L2 and the third connecting line L3 are turned on, so that the protection capacitor C and the discharging resistor R form an RC discharging circuit, and thus, the electric quantity stored in the protection capacitor C is released. When the power switch K0 is turned on again, the power source E charges the protection capacitor C again through the first loop.
When the power switch K0 is in the closed state, the second connecting line L2 and the first connecting line L1 are turned on, so that the protection capacitor C and the power supply E form a first loop, and the power supply E charges the protection capacitor C.
Alternatively, based on the above embodiment, reference is continued to fig. 2. The electric tool further comprises a diode D connected with the power switch K0 in parallel, and the cathode of the diode D is connected with the input end of the power switch K0, wherein the input end of the power switch K0 is connected with the positive electrode of the power supply E.
When the power switch is in an off state, the diode D provides a follow current loop to prevent the motor from generating voltage to damage the tool.
Alternatively, based on the above embodiment, reference is continued to fig. 2. The power tool further includes:
the device also comprises a fourth interconnecting line L4;
one end of the fourth connecting wire L4 is connected with the positive electrode of the power supply E, and the other end of the fourth connecting wire L4 is connected with a preset part of the electric tool; one end of the second connecting wire L2 connected with the protective capacitor C is also connected with a preset part;
the controller 30 is further configured to:
detecting whether the power-on signals of the fourth connecting line L4 and the second connecting line L2 are synchronous or not;
if the power-on signals of the fourth connection line L4 and the second connection line L2 are not synchronized, the driving circuit 20 is controlled to drive the motor 10 to rotate.
The fourth connecting line L4 is directly connected with the power source E and a preset component of the electric tool to form a first discharging loop, so that the first connecting line L1 is electrified when the power source is plugged.
The second interconnection L2 is connected to the power source E through the power switch K0, so that the second interconnection L2 is powered up only when the power switch K0 is closed.
In this embodiment, the controller 30 detects the power-on time of the fourth connecting line L4 and the second connecting line L2 respectively, and when the controller 30 detects that the power-on time of the fourth connecting line L4 and the second connecting line L2 are not synchronous, that is, the fourth connecting line L4 and the second connecting line L2 are powered on successively, at this time, the controller 30 controls the driving circuit 30 to start the motor 10 to rotate.
Specifically, when the power switch K0 is turned off and the power switch K0 is turned on after the package is inserted, the power-on time of the second link L2 is later than the power-on time of the fourth link, and the controller 30 controls the driving circuit 30 to output the driving signal to start the motor 10.
When the power switch K0 is in the closed state for the package insertion operation, if the electric quantity of the protection capacitor C is not released, after the battery package is inserted, the second connection line L2 and the fourth connection line L4 are simultaneously powered on, and the controller 30 does not output an excitation signal at this time, that is, does not start the motor 10, thereby achieving the purpose of starting up protection for the package insertion operation in the pressed state of the power switch K0. If the electric quantity of the protection capacitor C is already released or partially released, the power-on time of the second connecting line L2 is later than the power-on time of the fourth connecting line L4 after the battery pack is inserted, and at this time, the power supply E pack charges the protection capacitor C to realize the start-up delay protection of the electric tool, and the controller 30 controls the driving circuit 30 to output a driving signal to start the motor 10.
Alternatively, based on the above embodiment, reference is continued to fig. 2. The preset component is a power conversion module 40; the input end of the power conversion module 40 is connected with the second connecting line L2, and the output end is connected with the controller 30;
the power conversion module 40 is configured to output a set voltage when the power switch K0 is in a closed state.
The power conversion module 40 is configured to convert an output voltage of the power source E and then supply power to the controller 30, the driving chip, and other devices, so as to convert a high-voltage signal accessed by the power source E into a power supply voltage output adapted to the controller 30 and the driving chip. For example, in some embodiments, to power the driver chip and controller 30, the power conversion module 40 drops the voltage from the power source E to 15V to power the controller 30, and drops the power source E to 3.2V to power the driver chip.
It should be noted that the power conversion module 40 in this embodiment may include a plurality of different power conversion sub-modules, each of which outputs a different power supply voltage to power devices with different rated voltages.
In some embodiments, the power conversion module 40 is also used to power the sensor. For example, when the sensor is used to detect the open/close state of the limit switch K1, the power supply terminal of the sensor is connected to the power supply E converting module, so as to supply power to the sensor through the power supply converting module 40.
Optionally, on the basis of the above embodiment, one end of the limit switch K1 is connected to a preset port of the controller 30, and the other end is connected to an output end of the power conversion module 40, so as to obtain the set voltage through the power conversion module 40;
when the preset port of the controller 30 detects the set voltage, the controller 30 determines that the limit switch K1 is in the closed state.
One end of the limit switch K1 is connected to the power conversion module 40, so as to provide a set voltage signal through the power conversion module 40, and when the limit switch K1 is closed, a preset port of the controller 30 detects that a branch of the limit switch K1 has the set voltage signal, and determines that the limit switch K1 is in a closed state. When the limit switch K1 is turned off, the preset port of the controller 30 cannot detect the set voltage signal, and thus the controller 30 determines that the limit switch K1 is in the off state.
In this embodiment, the limit switch K1 is connected to the power conversion module 40, and the power conversion module 40 provides a set voltage, so that when the power switch K0 is turned on, the power conversion module 40 is powered on, and if the limit switch K1 is turned on before the power switch K0 is turned on, the controller 30 detects that the branch of the limit switch K1 has a set voltage signal, and allows the operation of the starter motor 10 to be performed. If the limit switch K1 is turned on later than the power switch K0, the controller 30 detects that the power switch K0 is turned on, and the controller 30 prohibits the operation of the start motor 10 because the branch of the limit switch K1 is not set with the voltage signal at this time, and the controller 30 determines that the limit switch K1 is not turned on, thereby causing erroneous operation.
Alternatively, based on the above embodiment, reference is continued to fig. 2. The electric tool further comprises a switch pressing degree feedback circuit, the switch pressing degree feedback circuit comprises a sliding rheostat R0, two fixed ends of the sliding rheostat R0 are respectively connected with the power conversion module 40, and a sliding end of the sliding rheostat R0 is connected with the controller 30. When the pressing degree changes, the voltage signal fed back to the controller 30 by the slide rheostat R0 changes, and the controller 30 detects the pressing degree based on the voltage signal.
In some embodiments, the power switch K0, the switch pressing degree feedback circuit, the limit switch K1 and the diode D are configured as a complete and cooperative switching device 50, which can be produced in a modularized manner, and when the switching device fails, the module is directly replaced, so as to simplify the maintenance process.
Optionally, fig. 3 is a flowchart of a method for starting an electric tool according to an embodiment of the present invention, where the method may be applied to a case of controlling a safe start of the electric tool. The method may be performed by a controller of a power tool, and referring to fig. 3, the method specifically includes the steps of:
s310, acquiring a first switching signal of the power switch and a second switching signal of the limit switch.
The controller detects a first switching signal of the power switch and a second switching signal of the limit switch in real time so as to detect the switching state of the power switch and the switching state of the limit switch.
And S320, if the power switch is determined to be closed based on the first switch signal, judging whether the limit switch is in a closed state based on the second switch signal.
Wherein the controller determines that the power switch is closed based on the first switch signal, indicating that an operation to start the motor is required. At this time, the controller detects the open/close state of the limit switch based on the second switch signal.
According to the embodiment, the limit switch is connected with the set voltage and the controller, when the limit switch is closed, the controller can detect that the limit switch branch has the set voltage signal, and therefore the controller judges whether the limit switch is in a closed state or an open state by detecting whether the limit switch branch has the set voltage signal.
In one embodiment, one end of the limit switch is connected with a preset port of the controller, and the other end of the limit switch is connected with the output end of the power conversion module so as to obtain a set voltage through the power conversion module; the controller detects whether the limit switch is in a closed state or not specifically through the following method:
when the preset port detects the set voltage, determining that the limit switch is in a closed state;
otherwise, determining that the limit switch is in an off state.
The power supply conversion module is used for converting a high-voltage signal output by the power supply and outputting a low-voltage signal matched with power devices such as a controller and a driving chip. In this embodiment, one end of the limit switch is connected to the power conversion module, and the other end of the limit switch is connected to the preset port of the controller, so that when the limit switch is turned on, the preset port of the controller has a voltage signal, and when the limit switch is turned off, the preset port of the controller has no voltage signal, and the controller detects the on/off state of the limit switch by detecting whether the preset port has the voltage signal.
S330, if the limit switch is in a closed state, the driving circuit is controlled to drive the motor to rotate.
When the controller detects that the limit switch is in a closed state, the controller outputs a control signal allowing the motor to rotate. Specifically, when the limit switch is determined to be in a closed state, the controller can output a control signal with a preset duty ratio, and under the action of the control signal, the electronic switch in the driving circuit is turned on according to a certain sequence, so that the driving circuit can distribute the voltage signal of the input end to the phase windings of the motor according to the duty ratio of the control signal, and the phase windings of the motor can acquire an excitation signal according to a certain sequence, thereby driving the motor to rotate.
When the limit switch is in an off state, the controller controls the driving circuit to stop outputting the excitation signal so as to inhibit the motor from rotating. For example, when it is determined that the limit switch is turned off, the controller outputs another control signal at this time, and the control signal is applied to the driving circuit to turn off the switching tube in the driving circuit, so that the driving circuit is prohibited from outputting the excitation signal to the motor, and the motor is prohibited from being started.
According to the starting method of the electric tool, the limit switch is arranged in the electric tool and is connected with the controller, when the controller detects that the power switch is closed, the controller further detects a switch signal of the limit switch to detect whether the limit switch is closed, and if the limit switch is detected to be closed, the controller controls the driving circuit to drive the motor to operate. The limit switch in this embodiment is electrically connected to the controller, and the controller detects an electrical feedback signal of the limit switch to detect an open/close state of the limit switch, and when detecting that the limit switch is closed, allows a start operation of the motor. The controller of the embodiment carries out soft judgment on the opening and closing state of the limit switch based on the electric feedback signal of the limit switch, so that the problem that the limit switch of a mechanical structure fails is solved, the state detection precision of the limit switch is improved, and the starting control of the electric tool based on the opening and closing state of the limit switch can be accurately realized.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (8)
1. A power tool, comprising:
the motor is used for driving the electric tool to work;
the driving circuit is connected with the motor and is used for outputting an excitation signal to drive the motor to rotate;
characterized by further comprising: the device comprises a power switch, a limit switch and a controller;
the power switch is connected to the output end of the power supply and used for controlling the power supply output of the power supply;
one end of the limit switch is connected with the controller, and the other end of the limit switch is connected with a set voltage;
the controller is also connected with the driving circuit and the power switch respectively, and the controller is configured to:
acquiring a first switching signal of the power switch and a second switching signal of the limit switch;
if the power switch is determined to be closed based on the first switch signal, judging whether the limit switch is in a closed state or not based on the second switch signal;
if the limit switch is in a closed state, the driving circuit is controlled to drive the motor to rotate;
further comprises:
the protection capacitor is connected in parallel with the two ends of the power supply;
when the power switch is in a closed state, the power switch, the capacitor and the power supply form a first loop;
when the power switch is in an off state, the power switch and the capacitor form a second loop;
the positive electrode of the power supply is connected with a first wiring terminal of the power supply switch through a first connecting wire, the first end of the protection capacitor is connected with a second wiring terminal of the power supply switch through a second connecting wire, and the second end of the protection capacitor is connected with the negative electrode of the power supply;
the power supply device further comprises a third connecting wire and a discharge resistor, one end of the third connecting wire is connected with a third wiring end of the power supply switch, the other end of the third connecting wire is connected with one end of the discharge resistor, and the other end of the discharge resistor is connected with a second end of the protection capacitor;
when the first wiring terminal and the second wiring terminal are conducted, the power switch is in a closed state, and the protection capacitor, the power switch and the power supply form the first loop through the first connecting wire and the second connecting wire;
when the third wiring terminal and the second wiring terminal are conducted, the power switch is in an off state, and the protection capacitor, the power switch and the discharge resistor form the second loop through the second connecting wire and the third connecting wire.
2. The power tool of claim 1, further comprising a fourth tie line;
one end of the fourth connecting wire is connected with the positive electrode of the power supply, and the other end of the fourth connecting wire is connected with a preset part of the electric tool; one end of the second connecting wire, which is connected with the protective capacitor, is also connected with the preset component;
the controller is further configured to:
detecting whether the power-on signals of the fourth connecting wire and the second connecting wire are synchronous or not;
and if the power-on signals of the fourth connecting wire and the second connecting wire are not synchronous, controlling the driving circuit to drive the motor to rotate.
3. The power tool of claim 2, wherein the predetermined component is a power conversion module; the input end of the power conversion module is connected with the second connecting wire, and the output end of the power conversion module is connected with the controller;
the power conversion module is used for outputting a set voltage when the power switch is in a closed state.
4. The power tool according to claim 3, wherein one end of the limit switch is connected to a preset port of the controller, and the other end is connected to an output end of the power conversion module, so as to obtain the set voltage through the power conversion module;
when the preset port of the controller detects the set voltage, the controller determines that the limit switch is in a closed state.
5. The power tool of claim 1, further comprising a diode connected in parallel with the power switch, and wherein a cathode of the diode is connected to an input of the power switch, wherein the input of the power switch is connected to a positive pole of the power source.
6. The power tool of claim 1, wherein the controller is further configured to:
and if the limit switch is in an off state, controlling the driving circuit to stop outputting an excitation signal so as to inhibit the motor from rotating.
7. A method for starting a power tool, applied to the power tool of any one of claims 1 to 6, comprising:
acquiring a first switching signal of a power switch and a second switching signal of a limit switch;
if the power switch is determined to be closed based on the first switch signal, judging whether the limit switch is in a closed state or not based on the second switch signal;
and if the limit switch is in a closed state, controlling the driving circuit to drive the motor to rotate.
8. The method according to claim 7, wherein one end of the limit switch is connected to a preset port of the controller, and the other end is connected to an output end of the power conversion module, so as to obtain the set voltage through the power conversion module; the judging whether the limit switch is in a closed state based on the second switch signal comprises:
when the preset port detects the set voltage, determining that the limit switch is in a closed state;
otherwise, determining that the limit switch is in an off state.
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| CN114598186A (en) | 2022-06-07 |
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