CN114415571B - Control method for preventing stalling of brushless garden tool - Google Patents
Control method for preventing stalling of brushless garden tool Download PDFInfo
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
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Abstract
The invention relates to a control method for preventing locked rotor of a brushless garden tool, which is based on a brushless controller for preventing locked rotor, wherein the brushless controller comprises a power supply module, a switch module, a motor driving module, a main control MCU, a voltage detection module, a temperature detection module and a current detection module, wherein the main control MCU detects the voltage of a battery pack through Vsen and BV points, detects the current of the brushless controller through Isen and the three-phase reaction electromotive force of the brushless motor through P, so as to calculate the current rotating speed of the motor, operates the brushless motor through D-drive DEIVER, and intelligently judges the current working condition, whether locked rotor is performed or not and the degree of locked rotor pair through the current of the controller, the battery pack power supply voltage and the change curve of the rotating speed of the brushless motor received by the MCU. And then the problem of low efficiency and trouble in the starting scheme after the brushless motor is locked up in the market is effectively solved, the efficiency is high, stability, and user experience is good.
Description
Technical Field
The invention relates to the technical field of brushless motor control, in particular to a control method for preventing a brushless garden tool from locked-rotor.
Background
With the progressive maturation of brushless motor technology, a large number of brushless garden power tools are now on the market. And the brushless garden electric tool frequently encounters excessive dense grass, dry branches, stones and the like during normal operation. This is the culprit of causing the brushless motor to stall.
Therefore, in order to prevent the brushless motor from blocking, the current of the brushless motor is detected in the market, the motor is stopped when the current is detected to be too large, and then objects such as weeds, dry branches, too thick and too hard branches and the like are manually removed. However, such a scheme is not efficient, and there is a problem that the user repeatedly operates the operating position of the machine, and the safety is poor and the experience is poor because the user manually restarts the machine after removing an object difficult to work by himself.
Disclosure of Invention
The invention provides a control method for preventing a brushless garden tool from being blocked, which can solve the technical problems of low efficiency and high expenditure of a treatment scheme after the blocked rotation of a brushless motor in the market.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the control method for preventing the anti-locked rotation of the brushless garden tool is based on a brushless controller for preventing the locked rotation, the brushless controller comprises a power supply module, a switch module, a motor driving module, a main control MCU, a voltage detection module, a temperature detection module and a current detection module,
the power supply module is connected with the temperature detection module,
the switch module is respectively connected with the voltage detection module, the motor driving module and the NC1 pin of the main control MCU,
the voltage detection module is respectively connected with a Vsen pin and a BV pin of the main control MCU,
the motor driving module is respectively connected with the current detecting module, the D pin and the P pin of the main control MCU,
and the temperature detection module is respectively connected with the BS pin and the PT1 pin of the main control MCU.
The current detection module is connected with an Isen pin of the main control MCU;
the main control MCU detects the battery pack voltage through Vsen and BV points, detects the current size of brushless controller operation through Isen, detects the three-phase reaction electromotive force of brushless motor through P to calculate the rotational speed at that time of motor, utilize D drive DEIVER to operate brushless motor, carry out intelligent judgement at that time through the change curve of the current of the controller that MCU received, battery pack supply voltage, brushless motor rotational speed, whether the locked rotor has been carried out to the behavior at that time, and the degree of locked rotor pair.
Further, judging that the brushless controller entering the locked rotor can perform motor stopping operation through the change curve, and then controlling the brushless motor to perform reverse restarting operation by the brushless controller, and automatically restarting for a plurality of times to remove the foreign matters and weeds in locked rotor;
when the operation is carried out, the brushless controller still carries out intelligent analysis through a change curve of current, voltage and rotation speed, if the locked rotor is difficult to remove, the brushless controller can learn through the analysis curve and carry out the action of stopping the motor, so that the manual work is safely removed, and if the motor is normally locked, the foreign matters are removed through the intelligent anti-locked rotor action.
Further, the control method comprises the following specific steps,
(1) Start-up
Pressing down a controller switch to perform starting operation, wherein in the process, an MCU (micro control Unit) detects whether the power supply voltage of a battery pack is normal or not through a voltage detection module, a current detection module detects whether the current of the controller is excessive or not, a temperature detection module detects whether the temperature of the battery pack is normal or not, the detection is normal and abnormal, and the detection is carried out on the MCU marker bit respectively, when the voltage, the temperature and the current are both the normal marker bit, the motor operation is performed in the next step, otherwise, the controller buzzes and alarms, and the motor does not operate;
(2) Operation of an electric machine
When the motor runs, the voltage and current temperature detection is still continuously carried out, and when each abnormal mark position appears, the motor is stopped, and the commutation interruption detection is carried out;
(3) Locked rotor counter plus 1
When the system is initialized, the stall counter is 0, and the stall counter is increased by 1.
(4) Entering commutation phase interrupt
Detecting three-phase commutation of the motor, judging whether the motor enters into a commutation interruption, wherein the motor normally works when the motor enters into the commutation interruption, the motor does not enter into the commutation interruption, the voltage is reduced, and the current is increased, so that the motor is blocked;
(5) Clear 0 of locked rotor counter
When the phase change is interrupted, the motor works normally, and the locked rotor counter is cleared to 0;
(6) The locked rotor counter is more than 2
In order to enter the commutation interruption, judging whether the locked rotor counter is larger than 2, and when the motor is locked, performing 2 times of motor operation to reach the step, wherein the operation is to prevent the small locked rotor from frequently triggering the anti-blocking function, and the normal small locked rotor can be cleared after 2 times of normal operation;
(7) Switch release
Whether the switch is loosened is judged, and the step is to judge whether an operator needs to stop the machine or not, self-clean the locked-up rotation or perform the locked-up rotation prevention operation.
Further, the control method further comprises the following steps,
(8) Automatic restart
Detecting that the switch is not loosened, and repeatedly restarting the motor by the controller; so as to be convenient for flushing out the blockage, recovering normal work, and enabling the motor to reversely rotate by a small amplitude and then forward rotate in the restarting process; in the process, the detection of the power supply voltage of the battery pack, the running current and the signals of the three phases of the motor can be carried out, and the difficulty of clearing the blockage can be judged through the detection.
Further, the control method further comprises the following steps,
(9) The locked rotor counter is larger than 7, and the stubborn locked rotor flag bit
When the locked rotor counter is larger than 7 or the stubborn locked rotor mark position 1, the next stop operation is carried out; the locked rotor counter is larger than 7, which means that the controller has performed anti-locked rotation operation for 5 times and the locked rotor is not released; judging that the anti-blocking operation cannot be released after repeated anti-blocking operation, stopping the machine, and enabling an operator to manually remove the blocking object; and in the process of detecting the power supply voltage, the running current and the motor three-phase signals of the battery pack, comprehensively judging the three curves, and when any one of the three curves exceeds a set safe working value, if the current exceeds the set value, stopping the motor at the position 1 of the stubborn locked rotor mark in the 10 th step.
(10) Shutdown
When the switch is released, or the locked rotor counter is larger than 7, or the intractable sign position 1 is used for stopping the motor, the motor is stopped.
Further, the switch module comprises a P+ port, a TP+ port, a ST-port, a BS+ port, a first switch SW1, a second switch SW2, a resistor R1, a resistor R2 and a diode D1,
the positive electrode of the upper battery pack is connected with the P+ port,
the P+ port is respectively connected with the TP+ port, the voltage detection module 3 and the motor driving module 4,
the TP+ port is respectively connected with the first switch SW1 and the second switch SW2,
the first switch SW1 is connected to the anode of the diode D1 through the ST-port,
the cathode of the diode D1 is connected to the voltage detection module 3,
the second switch SW2 is connected to one end of the resistor R1 through the BS + port,
the other end of the resistor R1 is connected with the ground GND through a resistor R2,
the other path of the other end of the resistor R1 is connected with an NC1 pin of the main control MCU.
Further, the voltage detection module comprises a third switch SW3, a diode D2, a resistor R10, a resistor R11, a resistor R12, a resistor R13 and a power conversion module,
one end of the third switch SW3 is connected with the P+ port, a first path at the other end of the third switch SW3 is connected with the cathode of the diode D2, the anode of the diode D2 is connected with the cathode of the diode D1, a second path at the other end of the third switch SW3 is connected with the power VCC through the power conversion module, a third path at the other end of the third switch SW3 is connected with one end of the resistor R12, one path at the other end of the resistor R12 is connected with a BV pin of the main control MCU, and the other path at the other end of the resistor R12 is connected with the ground GND through the resistor R13.
Further, the temperature detection module comprises a PT1 port, PT1 of the Battery1 pack is connected with one end of the resistor R4, one path of the other end of the resistor R4 is connected with the ground GND through the resistor R5, and the other path of the other end of the resistor R1 is connected with a PT1 pin of the main control MCU.
Further, the current detection module comprises an operational amplifier U1, a resistor R9 and a resistor R3, one path of the inverting input end of the operational amplifier U1 is connected with the motor driving module 4, the other path of the inverting input end of the operational amplifier U1 is connected with the ground GND through the resistor R9, one path of the output end of the operational amplifier U1 is connected with an Isen pin of the main control MCU, and the other path of the output end of the operational amplifier U1 is connected with the non-inverting input end of the operational amplifier U1 through the resistor R3.
According to the technical scheme, the control method for preventing the brushless garden tool from being blocked utilizes the detected current of the work of the controller, the change curve formed by the voltage provided by the battery pack and the rotating speed of the brushless motor is used for intelligently controlling the brushless controller, the brushless motor is blocked, the reverse starting is carried out, the reverse cutting is carried out on sundries, even repeated reverse starting is carried out for many times, and further the problems of low efficiency, high efficiency, stability and good user experience in the scheme of starting the brushless motor after the blocking in the market are effectively solved.
Drawings
FIG. 1 is a system block diagram of an anti-blocking circuit of the present invention;
fig. 2 is a flow chart of the method of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention.
As shown in fig. 1, the control method for preventing stalling of a brushless garden tool according to the embodiment is based on a stalling-preventing brushless controller, which comprises a power supply module 1, a switch module 2, a motor driving module 4, a main control MCU, a voltage detection module 3, a temperature detection module 5, and a current detection module 6,
the power supply module 1 is connected with the temperature detection module 5,
the switch module 2 is respectively connected with the voltage detection module 3, the motor driving module 4 and the NC1 pin of the main control MCU,
the voltage detection module 3 is respectively connected with a Vsen pin and a BV pin of the main control MCU,
the motor driving module 4 is respectively connected with the current detecting module 6 and the D pin and the P pin of the main control MCU,
and the temperature detection module 5 is respectively connected with a BS pin and a PT1 pin of the main control MCU.
The current detection module 6 is connected with an Isen pin of the main control MCU.
Wherein,
the switch module 2 comprises a P+ port, a TP+ port, an ST-port, a BS+ port, a first switch SW1, a second switch SW2, a resistor R1, a resistor R2 and a diode D1,
the positive electrode of the upper battery pack 11 is connected to the P + port,
the P+ port is respectively connected with the TP+ port, the voltage detection module 3 and the motor driving module 4,
the TP+ port is respectively connected with the first switch SW1 and the second switch SW2,
the first switch SW1 is connected to the anode of the diode D1 through the ST-port,
the cathode of the diode D1 is connected to the voltage detection module 3,
the second switch SW2 is connected to one end of the resistor R1 through the BS + port,
the other end of the resistor R1 is connected with the ground GND through a resistor R2,
the other path of the other end of the resistor R1 is connected with an NC1 pin of the main control MCU.
The voltage detection module 3 comprises a third switch SW3, a diode D2, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a power conversion module,
one end of the third switch SW3 is connected with the P+ port, a first path at the other end of the third switch SW3 is connected with the cathode of the diode D2, the anode of the diode D2 is connected with the cathode of the diode D1, a second path at the other end of the third switch SW3 is connected with the power VCC through the power conversion module, a third path at the other end of the third switch SW3 is connected with one end of the resistor R12, one path at the other end of the resistor R12 is connected with a BV pin of the main control MCU, and the other path at the other end of the resistor R12 is connected with the ground GND through the resistor R13.
The temperature detection module 5 comprises a PT1 port, PT1 of the first Battery1 pack is connected with one end of the resistor R4, one path of the other end of the resistor R4 is connected with the ground GND through the resistor R5, and the other path of the other end of the resistor R1 is connected with a PT1 pin of the main control MCU.
The current detection module 6 comprises an operational amplifier U1, a resistor R9 and a resistor R3, one path of the inverting input end of the operational amplifier U1 is connected with the motor driving module 4, the other path of the inverting input end of the operational amplifier U1 is connected with the ground GND through the resistor R9, one path of the output end of the operational amplifier U1 is connected with an Isen pin of the main control MCU, and the other path of the output end of the operational amplifier U1 is connected with the non-inverting input end of the operational amplifier U1 through the resistor R3.
MCU detects battery package voltage through Vsen and BV point, detects the electric current size that brushless controller operated through Isen, detects brushless motor's three-phase reaction electromotive force through P to calculate motor's rotational speed at that time, utilize D drive DEIVER to operate brushless motor. The current of the controller, the power supply voltage of the battery pack and the change curve of the rotating speed of the brushless motor are received by the MCU to intelligently judge whether the current working condition is locked or not and the degree of locked rotation. And judging that the brushless controller entering the locked rotor can perform motor stopping operation through the change curve, and then controlling the brushless motor to perform reverse restarting operation by the brushless controller, and automatically restarting for a plurality of times to remove the foreign matters and weeds in the locked rotor. During this operation, the brushless controller still performs intelligent analysis through the change curve of the current, voltage and rotation speed. If the locked rotor is difficult to remove, the motor can be damaged by forced removal, the brushless controller can learn through an analysis curve, and the motor is stopped, so that the manual removal is safe. And common locked rotor can be prevented by intelligent locked rotor action, so that foreign matters can be removed efficiently.
Specifically, the control process of the invention is as follows:
(1) Start-up
The controller switch is pressed down to perform starting operation, and the MCU detects whether the power supply voltage of the battery pack is normal or not through the voltage detection module in the process. And the current detection module is used for detecting whether the current of the controller is overlarge. And the temperature detection module is used for detecting whether the temperature of the battery pack is normal or not. The detection of the normal and the abnormality can be respectively carried out on the MCU zone bit, and when the voltage, the temperature and the current are both obtained into the normal zone bit, the next motor operation is carried out. Otherwise, the controller buzzes and alarms, and the motor does not run.
(2) Operation of an electric machine
When the motor runs, voltage and current temperature detection is still continuously carried out, and when each abnormal mark position 1 appears, the motor is stopped. And a commutation interrupt detection is performed.
(3) Locked rotor counter plus 1
When the system is initialized, the stall counter is 0, and the stall counter is increased by 1.
(4) Entering commutation phase interrupt
And detecting three-phase commutation of the motor, and judging whether the motor enters into commutation interruption or not. The phase change interruption is indicated by normal operation of the motor, the phase change interruption is not entered, the voltage is reduced, and the current is increased, so that the motor is blocked.
(5) Clear 0 of locked rotor counter
The phase change is interrupted, the motor works normally, and the locked rotor counter is cleared to 0. Avoid the third step to add 1 to the locked rotor counter all the time to enter the 6 th step by mistake
(6) The locked rotor counter is more than 2
To enter the commutation interrupt, it is determined whether the stall counter is greater than 2. When the motor is locked, the motor is operated for 2 times, and the step is reached. The operation is to prevent the frequent triggering of the anti-blocking function of small blocking, and the normal small blocking can be removed after 2 times of normal operation.
(7) Switch release
And judging whether the switch is released or not. This step is performed in order to determine whether the operator should stop the machine, self-clean the locked-rotor, or perform the locked-rotor prevention operation.
(8) Automatic restart
The controller repeatedly restarts the motor by a small amount when the switch is detected not to be released. So as to be convenient for flushing the blockage and recovering the normal work. In the restarting process, the motor is reversely rotated by a small amplitude and then is rotated forward. This allows for more effective removal of the plugs. In the process, the detection of the power supply voltage of the battery pack, the running current and the signals of the three phases of the motor can be carried out. By these difficulties in determining the removal of the obstruction, the more difficult it is to remove, the greater the current will be drawn, the lower the voltage will be pressed, and the greater the three-phase voltage ripple will be.
(9) The locked rotor counter is larger than 7, and the stubborn locked rotor flag bit
And when the locked rotor counter is larger than 7 or the stubborn locked rotor mark position 1, stopping the machine in step 10. The locked rotor counter is larger than 7, which means that the controller has performed anti-locked rotation operation for 5 times and the locked rotor is not released. If the anti-blocking operation is judged to be performed for a plurality of times, the anti-blocking operation cannot be released, the machine is stopped, and an operator can manually remove the blocking object. And in the process of detecting the power supply voltage, the running current and the signals of the three phases of the motor of the battery pack. And comprehensively judging the curve of the third step, and if the value of any one of the curves exceeds a set safe working value, if the current exceeds the set value, stopping the machine at the 10 th step at the position 1 of the stubborn locked-rotor mark. This operation is to protect the machine from damage caused by forced restarting of the machine. The intelligent non-rigid anti-blocking operation is realized.
(10) Shutdown
When the switch is released, or the locked-rotor counter is larger than 7, or the intractable sign is positioned at 1, stopping is carried out. Stopping the rotation of the motor, facilitating the removal of the blockage by the operator, being safe and preventing the damage to the operator caused by the starting of the machine.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. The control method for preventing the anti-locked rotation of the brushless garden tool is based on a brushless controller for preventing the locked rotation, the brushless controller comprises a power supply module (1), a switch module (2), a motor driving module (4), a main control MCU, a voltage detection module (3), a temperature detection module (5) and a current detection module (6),
the power supply module (1) is connected with the temperature detection module (5),
the switch module (2) is respectively connected with the voltage detection module (3), the motor driving module (4) and NC1 pins of the main control MCU,
the voltage detection module (3) is respectively connected with a Vsen pin and a BV pin of the main control MCU,
the motor driving module (4) is respectively connected with the current detecting module (6) and the D pin and the P pin of the main control MCU,
the temperature detection module (5) is respectively connected with a BS pin and a PT1 pin of the main control MCU;
the current detection module (6) is connected with an Isen pin of the main control MCU;
the method is characterized in that:
the main control MCU detects the voltage of the battery pack through Vsen and BV points, detects the current of the brushless controller through Isen, detects the three-phase reaction electromotive force of the brushless motor through P, so as to calculate the current rotating speed of the motor, and uses D to drive the DEIVER to operate the brushless motor, and intelligently judges whether the current working condition is locked or not through the current of the controller, the battery pack power supply voltage and the change curve of the rotating speed of the brushless motor received by the MCU;
the control method comprises the following specific steps of,
(1) Start-up
Pressing down a controller switch to perform starting operation, wherein in the process, an MCU (micro control Unit) detects whether the power supply voltage of a battery pack is normal or not through a voltage detection module, a current detection module detects whether the current of the controller is excessive or not, a temperature detection module detects whether the temperature of the battery pack is normal or not, the detection is normal and abnormal, and the detection is carried out on the MCU marker bit respectively, when the voltage, the temperature and the current are both the normal marker bit, the motor operation is performed in the next step, otherwise, the controller buzzes and alarms, and the motor does not operate;
(2) Operation of an electric machine
When the motor runs, the voltage and current temperature detection is still continuously carried out, and when each abnormal mark position appears, the motor is stopped, and the commutation interruption detection is carried out;
(3) Locked rotor counter plus 1
When the system is initialized, the locked rotor counter is 0, and 1 is added to the locked rotor counter when the system is initialized;
(4) Entering commutation phase interrupt
Detecting three-phase commutation of the motor, judging whether the motor enters into a commutation interruption, wherein the motor normally works when the motor enters into the commutation interruption, the motor does not enter into the commutation interruption, the voltage is reduced, and the current is increased, so that the motor is blocked;
(5) Clear 0 of locked rotor counter
When the phase change is interrupted, the motor works normally, and the locked rotor counter is cleared to 0;
(6) The locked rotor counter is more than 2
In order to enter the commutation interruption, judging whether the locked rotor counter is larger than 2, and when the motor is locked, performing 2 times of motor operation to reach the step, wherein the operation is to prevent the small locked rotor from frequently triggering the anti-blocking function, and the normal small locked rotor can be cleared after 2 times of normal operation;
(7) Switch release
Judging whether the switch is loosened, wherein the step is to judge whether an operator needs to stop the machine, automatically clean the locked rotor or perform the anti-rotation operation;
the control method further includes the step of,
(8) Automatic restart
Detecting that the switch is not loosened, and repeatedly restarting the motor by the controller; so as to be convenient for flushing out the blockage, recovering normal work, and enabling the motor to reversely rotate by a small amplitude and then forward rotate in the restarting process; in the process, the detection of the power supply voltage of the battery pack, the running current and the signals of the three phases of the motor can be carried out, and the difficulty of clearing the blockage can be judged through the detection;
the control method further includes the step of,
(9) The locked rotor counter is larger than 7, and the stubborn locked rotor flag bit
When the locked rotor counter is larger than 7 or the stubborn locked rotor mark position 1, the next stop operation is carried out; the locked rotor counter is larger than 7, which means that the controller has performed anti-locked rotation operation for 5 times and the locked rotor is not released; judging that the anti-blocking operation cannot be released after repeated anti-blocking operation, stopping the machine, and enabling an operator to manually remove the blocking object; in the process of detecting the power supply voltage, the running current and the motor three-phase signals of the battery pack, comprehensively judging the three curves, and when any one of the three curves is over a set safe working value, if the current exceeds the set value, stopping the motor at the position 1 of the stubborn locked rotor mark in the 10 th step;
(10) Shutdown
When the switch is released, or the locked rotor counter is larger than 7, or the intractable sign position 1 is used for stopping the motor, the motor is stopped.
2. The control method for anti-lock rotation of a brushless garden tool according to claim 1, wherein: judging that the brushless controller entering the locked rotor can perform motor stopping operation through the change curve, and then controlling the brushless motor to perform reverse restarting operation by the brushless controller, and automatically restarting for a plurality of times to remove the foreign matters and weeds in the locked rotor;
when the operation is carried out, the brushless controller still carries out intelligent analysis through a change curve of current, voltage and rotation speed, if the locked rotor is difficult to remove, the brushless controller can learn through the analysis curve and carry out the action of stopping the motor, so that the manual work is safely removed, and if the motor is normally locked, the foreign matters are removed through the intelligent anti-locked rotor action.
3. The control method for anti-lock rotation of a brushless garden tool according to claim 2, wherein: the switch module (2) comprises a P+ port, a TP+ port, an ST-port, a BS+ port, a first switch SW1, a second switch SW2, a resistor R1, a resistor R2 and a diode D1,
the positive electrode of the upper battery pack (11) is connected with the P+ port,
the P+ port is respectively connected with the TP+ port, the voltage detection module 3 and the motor driving module 4,
the TP+ port is respectively connected with the first switch SW1 and the second switch SW2,
the first switch SW1 is connected to the anode of the diode D1 through the ST-port,
the cathode of the diode D1 is connected to the voltage detection module 3,
the second switch SW2 is connected to one end of the resistor R1 through the BS + port,
the other end of the resistor R1 is connected with the ground GND through a resistor R2,
the other path of the other end of the resistor R1 is connected with an NC1 pin of the main control MCU.
4. A control method for anti-lock rotation of a brushless garden tool according to claim 3, wherein: the voltage detection module (3) comprises a third switch SW3, a diode D2, a resistor R10, a resistor R11, a resistor R12, a resistor R13 and a power conversion module,
one end of the third switch SW3 is connected with the P+ port, a first path at the other end of the third switch SW3 is connected with the cathode of the diode D2, the anode of the diode D2 is connected with the cathode of the diode D1, a second path at the other end of the third switch SW3 is connected with the power VCC through the power conversion module, a third path at the other end of the third switch SW3 is connected with one end of the resistor R12, one path at the other end of the resistor R12 is connected with a BV pin of the main control MCU, and the other path at the other end of the resistor R12 is connected with the ground GND through the resistor R13.
5. The control method for preventing stalling of a brushless garden tool according to claim 4, wherein: the temperature detection module (5) comprises a PT1 port, the PT1 is connected with one end of a resistor R4, one path of the other end of the resistor R4 is connected with the ground GND through a resistor R5, and the other path of the other end of the resistor R1 is connected with a PT1 pin of the main control MCU.
6. The control method for preventing stalling of a brushless garden tool according to claim 5, wherein: the current detection module (6) comprises an operational amplifier U1, a resistor R9 and a resistor R3, one path of the inverting input end of the operational amplifier U1 is connected with the motor driving module 4, the other path of the inverting input end of the operational amplifier U1 is connected with the ground GND through the resistor R9, one path of the output end of the operational amplifier U1 is connected with an Isen pin of the main control MCU, and the other path of the output end of the operational amplifier U1 is connected with the non-inverting input end of the operational amplifier U1 through the resistor R3.
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