CN210895098U

CN210895098U - Take protect function's electric scissors circuit

Info

Publication number: CN210895098U
Application number: CN202020129277.5U
Authority: CN
Inventors: 夏兆建; 赵武
Original assignee: Hangzhou Moreway Technology Co ltd
Current assignee: Hangzhou Moreway Technology Co ltd
Priority date: 2020-01-20
Filing date: 2020-01-20
Publication date: 2020-06-30
Anticipated expiration: 2030-01-20

Abstract

The utility model discloses a take protect function's electric shear circuit relates to electric shear technical field, drive module: the driving module comprises a main control circuit, a driving module and a control module, wherein the main control circuit is used for receiving signals and controlling the driving module to work and operate; a detection module: the detection module and the driving module are in serial port communication through a serial port, and the detection module comprises a single chip microcomputer U2: the main control circuit is used for processing the signals detected by the detection module and uploading the signals to the driving module; hall position detection circuit: the Hall position sensor is connected with the singlechip and used for detecting the position of the tool bit of the electric shears and feeding back the position information into the singlechip; anti-shearing circuit: the single chip microcomputer is connected with the single chip microcomputer and judges whether a hand enters a knife edge when a user uses the electric knife by collecting the voltage of the anti-shearing circuit. The utility model is safer when being used for the electric shears.

Description

Take protect function's electric scissors circuit

Technical Field

The utility model relates to an electric shears technical field especially relates to a take protect function's electric shears circuit.

Background

The scheme of the prior art is as follows: with the development of the agricultural garden industry, electric power is used to replace manpower, which is a trend of the development of future electric tools. Compared with the manual pruning shears, the electric pruning shears have the advantages of labor saving, high efficiency, convenience and the like. Once released, the utility model is popular with the vast gardening workers.

Objective disadvantages of the prior art: most of the existing electric pruning shears do not have the function of preventing hands from being sheared, and only prompt the user. However, the pruning shears are sharp in edge and large in shearing force, and may cause danger when being used carelessly. The existence of danger cannot be completely avoided only by prompting warning marks or simple operation protection.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a take protect function's electric scissors circuit provides bigger more stable electric current for brushless motor, and can realize protection and detection to the circuit.

In order to achieve the above object, the utility model provides a following technical scheme:

an electric scissors circuit with protection function is characterized by comprising

A driving module: the driving module comprises a main control circuit, a driving module and a control module, wherein the main control circuit is used for receiving signals and controlling the driving module to work and operate;

a detection module: the detection module and the drive module are in serial port communication through a serial port, and the detection module comprises

Singlechip U2: the main control circuit is used for processing the signals detected by the detection module and uploading the signals to the driving module;

hall position detection circuit: the Hall position sensor is connected with the singlechip and used for detecting the position of the tool bit of the electric shears and feeding back the position information into the singlechip;

anti-shearing circuit: the single chip microcomputer is connected with the single chip microcomputer and judges whether a hand enters a knife edge when a user uses the electric knife by collecting the voltage of the anti-shearing circuit.

Further, the main control circuit adopts the following models: chip U1A of STM32F030K6T 6.

Further, the type of the single chip microcomputer U2 is as follows: HC32F003CAP 4.

Further, the hall position sensors include a first hall sensor H1, a second hall sensor H2, a third hall sensor H3, and a fourth hall sensor H4; pins 1 of the four Hall position sensors are all connected to VCC in parallel, pins 2 of the four Hall position sensors are respectively connected with a resistor and a capacitor, the other ends of the resistors are connected to VCC in parallel, and the other ends of the capacitors are grounded together; the 3 rd pins of the four Hall position sensors are commonly grounded.

Further, anti-shear flashlight circuit is including connecting terminal 1PIN on the trigger sheetmetal of electric scissors, the one end of terminal 1PIN is connected to the first end of resistance R5, diode D2's negative pole and resistance R10's first end, resistance R5's second end inserts the VCC, resistance R10's second end connects to the first end of electric capacity C11 and singlechip U2's TOUCH PIN, electric capacity C11's second end and diode D2's anodal ground connection jointly.

Further, the detection module further includes a communication interface circuit, the communication interface circuit includes an interface P1, the 1 st pin of the interface P1 is connected to the first end of the capacitor C6, the first end of the capacitor C10 and VCC, the second end of the capacitor C6 and the second end of the capacitor C10 are commonly grounded, the 2 nd pin of the interface P1 is grounded, the 3 rd pin of the interface P1 is connected to the first end of the resistor R1 and the cathode of the diode D1, the second end of the resistor is connected to the single chip microcomputer U2, and the anode of the diode D1 is grounded.

Compared with the prior art, the beneficial effects of the utility model are that: the detection module is added on the basis of the traditional electric shears driving circuit, the detection module can actively detect that the fingers of a user enter a knife edge, give an alarm and stop the shearing action, and the safety of the electric pruning shears in use is improved.

Drawings

Fig. 1 is an overall circuit structure frame according to an embodiment of the present invention;

fig. 2 is a block diagram of a driving module circuit according to an embodiment of the present invention;

fig. 3 is a block diagram of a circuit structure of a detection module according to an embodiment of the present invention;

fig. 4 is a main control circuit diagram of a driving module according to an embodiment of the present invention;

fig. 5 is a circuit diagram of a MOS transistor driving circuit of a driving module according to an embodiment of the present invention;

fig. 6 is a circuit diagram of an overcurrent and current detection circuit of a driving module according to an embodiment of the present invention;

fig. 7 is a circuit diagram of a back electromotive force acquisition circuit of a driving module according to an embodiment of the present invention;

fig. 8 is a buzzer alarm circuit diagram of a driving module according to an embodiment of the present invention;

fig. 9 is a circuit diagram of a detection module interface of a driving module according to an embodiment of the present invention;

fig. 10 is a circuit diagram of a power interface of a driving module according to an embodiment of the present invention;

fig. 11 is a power control circuit diagram of a driving module according to an embodiment of the present invention;

fig. 12 is a voltage stabilizing circuit diagram of a driving module according to an embodiment of the present invention;

fig. 13 is a diagram of a single chip microcomputer of a detection module and a peripheral circuit thereof according to an embodiment of the present invention;

fig. 14 is a circuit diagram of a hall position detection of a detection module according to an embodiment of the present invention;

fig. 15 is a circuit diagram of a detection module according to an embodiment of the present invention;

fig. 16 is a circuit diagram of a communication interface of a detection module according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1, the present invention provides an electric scissors circuit with protection function; comprises that

the master control circuit is shown in FIG. 4; the driving module uses an STM32F030K6T6 singlechip as a main control chip, and the main frequency is 24 MHz. The main control chip controls the work of other sub-modules on the driving module and processes the knife edge position signal sent by the knife edge position detection board. The circuit comprises a singlechip reset circuit, a debugging interface and a function indicator lamp.

The driving module also comprises a MOS tube driving circuit, which is shown in FIG. 5 and is a three-phase motor driving circuit, and comprises an FD6288 chip U3 connected with an STM32F030K6T6 chip, and the specific connection relationship can be seen as a network label. The 11 th pin, the 18 th pin, the 19 th pin and the 20 th pin of the FD6288 chip are connected with a first-phase driving circuit, the 10 th pin, the 15 th pin, the 16 th pin and the 17 th pin of the FD6288 chip are connected with a second-phase driving circuit, the 9 th pin, the 12 th pin, the 13 th pin and the 14 th pin of the FD6288 chip are connected with a third-phase driving circuit, and the first-phase driving circuit, the second-phase driving circuit and the third-phase driving circuit have the same structure; the first phase driving circuit has the following structure: a 11 th pin of the FD6288 chip is connected to a first end of a resistor R34, a second end of the resistor R34 is connected to a cathode of a diode D6 and a first end of a resistor R35, an anode of a diode D6 is connected to a second end of a resistor R35, a first end of a resistor R36, a first end of a capacitor C21, a gate of a MOS transistor Q3, a second end of a resistor R36, a second end of a capacitor C21, and a source of a MOS transistor Q3, an 18 th pin of the FD6288 chip is connected to a first end of a capacitor C19, a first end of a resistor R33, a first end of a capacitor C20, a source of a MOS transistor Q1, and a drain of a MOS transistor Q3 and serves as an output end of the first phase driver circuit, a 19 th pin of the FD6288 chip is connected to a first end of a resistor R31, a second end of a resistor R31 is connected to a cathode of a diode D31 and a first end of a resistor R31, a drain of a resistor R31, a second end of a resistor R31, a drain of a capacitor Q31, the 20 th pin of the FD6288 chip is connected to the second terminal of the capacitor C19 and the cathode of the diode D5, the anode of the diode D5 is connected to +12V, the first terminal of the capacitor C16 and the first terminal of the capacitor C44, and the second terminal of the capacitor C16 and the second terminal of the capacitor C44 are grounded. The motor driving circuit effectively controls the operation of the brushless motor, and improves the reliability of the whole circuit. The MOS tube drives a brushless motor for driving and controlling the tool bit. The FD6288 MOS tube driver controls three half bridges, and the single chip controls the conduction of the phase coils of the motor according to a specific sequence, and finally the motor rotates.

The circuit also comprises an overcurrent and current detection circuit, and with reference to fig. 6, the circuit comprises an SD06 chip U2; the 1 st pin of the SD06 chip is connected with the first end of a resistor R6, the first end of a resistor R3 and the first end of a capacitor C1, the second end of the resistor R6 and the first end of a capacitor C5 are connected with the 10 th pin of the STM32F030K6T6 chip, the 2 nd pin of the SD06 chip is connected with the first end of the resistor R5, the first end of a resistor R2 and the second end of the resistor R3, the second end of the capacitor C1 is connected, the 3 rd pin of the SD06 chip is connected with the first end of the resistor R9 and the first end of the resistor R10, the second end of the capacitor C4 is connected with the second end of the resistor R5, the 5 th pin of the SD06 chip is connected with the first end of the resistor R12 and the first end of the resistor R13, the 6 th pin of the SD06 chip is connected with the first end of the resistor R15 and the first end of the capacitor C8, the second end of the resistor R15 is connected with the first end of the resistor R16, the 7 th pin of the SD06 chip is connected with the first end of the resistor R14, and the second end of the resistor R14 and the first end of the capacitor C7 are connected with the 28 th pin of the STM32F030K6T6 chip. The current detection circuit realizes the detection of circuit current, and a differential amplifier with bias and a comparator are formed by an SD06 operational amplifier. After the bus current passes through the sampling resistor, the voltages at the two ends are respectively collected by the differential amplifier and the comparator. The differential amplifier has the amplification factor of 4.2 times, and is input into the singlechip AD after filtering. The comparator performs level turnover when the sampling current flows through the sampling resistor, and inputs the level turnover into a fracture in the singlechip to perform protection action

The motor is characterized by further comprising a counter electromotive force detection circuit, referring to fig. 7, the counter electromotive force detection circuit comprises a three-phase detection circuit with the same structure, the first phase is taken as an example for explanation, the resistance R22 is wrapped, the second end of the resistance R22, the first end of the resistance R25 and the first end of the capacitor C12 are connected to the 6 th pin of the STM32F030K6T6 chip, the current of the corresponding phase in the full-speed rotation of the motor is detected, and when the current is too large, the power supply of the motor can be cut off immediately. The structure of the other two phases is the same as the first phase, and will not be described herein. In addition, fig. 7 also includes a voltage detection circuit, which is the same as any one of the counter electromotive force detection circuits described above. The detection end is connected with VCC, and when the bus VCC is detected to be too large, the power supply of the motor is cut off immediately.

The power supply circuit also comprises a power supply interface circuit, a power supply control circuit and a voltage stabilizing circuit;

the power interface circuit is shown in fig. 10, the detection end of the power interface circuit is connected with the VCC, and when the bus VCC is detected to be too large, the power supply of the motor is cut off immediately. The POWER interface POWER is connected with a 12V storage battery and is filtered by two capacitors C34 and C37.

The power supply part of the driving module consists of two circuits, one is a power supply control and one-key starting circuit which consists of discrete devices; the other is a voltage stabilizing circuit which is used for converting 12V into 5V and converting 5V into 3.3V.

The power control circuit is shown in fig. 11, and is connected to the main control circuit and provides a voltage stabilizing function at the same time; the power supply control part obtains a level signal from a pin PWR _ EN of the singlechip. When PWR _ EN is low, the transistor Q4 is controlled to block the power input after passing through the circuit. This section is used for the timed auto-off function.

The one-key starting circuit part is controlled by an S1 switch, after the switch is pressed down, the power supply is communicated through a circuit control triode Q4, so that the single chip microcomputer is electrified and normally operated, then the Q4 is maintained by the high level output by PWR _ EN, and the normal work of the circuit is kept

Referring to fig. 12, the voltage stabilizing circuit includes ME6209a33 chip U6, ME6209a33 chip U6 pin 1 is grounded, ME6209a33 chip U6 pin 2 and the first end of capacitor C41 are connected to +5V, ME6209a33 chip U6 pin 3 is connected to the positive pole of capacitor C40, the first end of inductor L2 is connected, and the second end of inductor L2 and the first end of capacitor C42 output + 3.3V. The voltage reduction module reduces the +5V voltage to + 3.3V.

The buzzer circuit is used for being connected with a buzzer, is connected with the main control circuit and is externally connected with the buzzer as shown in figure 8; referring to fig. 14, the interface LS1 includes an interface LS1, a 1 st pin of the interface LS1 and a first end of a capacitor C32 are connected to +5V, a 2 nd pin of the interface LS1 is connected to a second end of the capacitor C32 and a first end of a resistor R57, a second end of a resistor R57 is connected to a collector of a transistor Q13, an emitter of the transistor Q13 is grounded, a base of the transistor Q13 is connected to a first end of the resistor R59, and a second end of the resistor R59 is connected to a 26 th pin of an STM32F030K6T6 chip.

Still include the interface circuit who is connected with the detection module, refer to fig. 9, including interface P3, the 1 st pin of P3 inserts +5V, 2 nd pin ground connection, the 4 th pin inserts the VCC, and the 3 rd pin inserts the first end of resistance R60, the first end and the master control circuit of resistance R63 are inserted to the second end of resistance R60, and the second end ground connection of resistance R63. Chip U1A is in one-way serial communication with the position pickup board module using a serial port, and the drive boards supply 5V from this interface to the position pickup board.

The detection module includes a communication interface circuit, as shown in fig. 16, the communication interface circuit includes an interface P1, a 1 st pin of the interface P1 is connected to a first end of a capacitor C6, a first end of a capacitor C10 and VCC, a second end of the capacitor C6 and a second end of the capacitor C10 are commonly grounded, a 2 nd pin of the interface P1 is grounded, a3 rd pin of the interface P1 is connected to a first end of a resistor R1 and a cathode of a diode D1, a second end of the resistor is connected to the single chip microcomputer U2, and an anode of the diode D1 is grounded. The signal interface is connected with the driving module, and the signal collected by the detection module is arranged and then is transmitted to the driving plate in a one-way mode. And the detection module gets a 5V supply via this interface.

The device is characterized by further comprising a single chip microcomputer U2, the single chip microcomputer U2 and peripheral circuits thereof are shown in fig. 13, the position detection board uses the HC32F003CAF4 single chip microcomputer as a main control chip, and the main frequency is 24 MHz. The main control chip is communicated with the drive board by using a serial port and collects Hall position signals and anti-shearing flashlight circuit output signals. The P2 and P3 terminals are debugging interfaces.

The position detection plate is used for detecting the position of a knife edge by four Hall sensors, a magnet at the tail of the knife edge passes through the four sensors in sequence in the process of opening and closing of the lower scissors in use, when the magnet passes through, the sensor outputs high level, the high level is input into the position plate singlechip after filtering, and the high level is uploaded to the driving plate after processing to control the operation of the knife edge of the motor.

The electric scissors further comprise a hand shearing prevention circuit, as shown in fig. 15, the electric scissors comprise a terminal 1PIN connected to a trigger metal sheet of the electric scissors, one end of the terminal 1PIN is connected to a first end of a resistor R5, a negative electrode of a diode D2 and a first end of a resistor R10, a second end of the resistor R5 is connected to VCC, a second end of the resistor R10 is connected to a first end of a capacitor C11 and a TOUCH PIN of a singlechip U2, and a second end of the capacitor C11 and a positive electrode of the diode D2 are grounded together;

the anti-shearing flashlight circuit consists of a pull-up resistor R5, a protection diode D2, a resistor R10 and a capacitor C11, the TOUCH is connected to a pin of the single chip microcomputer, and a terminal 1 is connected to a metal strip of a trigger. When the TOUCH screen is used, a user presses a trigger, the metal strip contacts a user finger, an equivalent capacitor is formed by the user and the ground at the moment, the single chip microcomputer TOUCH pin outputs a turnover level signal at a high frequency, the turnover level signal is charged and discharged to the equivalent capacitor formed by the human body and the ground after passing through the resistor R10, the single chip microcomputer TOUCH is converted into an AD mode to acquire the current voltage, if the voltage is lower than a recorded value after electrification, the fact that the user hand is in contact with a knife edge is shown, the position detection board sends an emergency stop command to the driving board, and downward shearing action.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. An electric scissors circuit with protection function is characterized by comprising

2. The electric scissors circuit with protection function of claim 1, wherein the main control circuit adopts the following model: chip U1A of STM32F030K6T 6.

3. The electric scissors circuit with the protection function as claimed in claim 2, wherein the single chip microcomputer U2 is of the type: HC32F003CAP 4.

4. The electric scissors circuit with protection function of claim 2, wherein the hall position sensors comprise a first hall sensor H1, a second hall sensor H2, a third hall sensor H3 and a fourth hall sensor H4; pins 1 of the four Hall position sensors are all connected to VCC in parallel, pins 2 of the four Hall position sensors are respectively connected with a resistor and a capacitor, the other ends of the resistors are connected to VCC in parallel, and the other ends of the capacitors are grounded together; the 3 rd pins of the four Hall position sensors are commonly grounded.

5. The electric scissors circuit with protection function of claim 1, wherein the anti-shearing flashlight circuit comprises a terminal 1PIN connected to a trigger metal sheet of the electric scissors, one end of the terminal 1PIN is connected to a first end of a resistor R5, a cathode of a diode D2 and a first end of a resistor R10, a second end of the resistor R5 is connected to VCC, a second end of the resistor R10 is connected to a first end of a capacitor C11 and a TOUCH PIN of a singlechip U2, and the second end of the capacitor C11 and an anode of the diode D2 are grounded together.

6. The electric scissors circuit with protection function of claim 1, wherein the detection module further comprises a communication interface circuit, the communication interface circuit comprises an interface P1, the 1 st pin of the interface P1 is connected to the first terminal of the capacitor C6, the first terminal of the capacitor C10 and VCC, the second terminal of the capacitor C6 and the second terminal of the capacitor C10 are commonly grounded, the 2 nd pin of the interface P1 is grounded, the 3 rd pin of the interface P1 is connected to the first terminal of the resistor R1 and the cathode of the diode D1, the second terminal of the resistor is connected to the single chip microcomputer U2, and the anode of the diode D1 is grounded.