CN212627736U - Load starting circuit and electric tool - Google Patents
Load starting circuit and electric tool Download PDFInfo
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- CN212627736U CN212627736U CN202021134427.8U CN202021134427U CN212627736U CN 212627736 U CN212627736 U CN 212627736U CN 202021134427 U CN202021134427 U CN 202021134427U CN 212627736 U CN212627736 U CN 212627736U
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Abstract
The utility model is suitable for an electric tool field provides a load starting circuit and electric tool, this load starting circuit, include: MCU; one end of the starting switch is used for connecting a battery pack, and the other end of the starting switch is connected with the MCU; one end of the battery pack detection module is used for connecting a battery pack, and the other end of the battery pack detection module is connected with the MCU; the battery pack detection module includes: the first end of the first resistor is used for being connected with the battery pack; the first end of the first resistor is connected with the first end of the first resistor; a capacitor connected in parallel with the second resistor; and the control end of the first switch tube is connected with the second end of the first resistor, the input end of the first switch tube is connected with the MCU, and the output end of the first switch tube is grounded. The embodiment of the utility model provides a through setting up battery package detection module, because the electric capacity among the battery package detection module charges needs time, detect out and be earlier male battery package or earlier closed starting switch to prevent starter motor under the abnormal operation, avoid taking place the potential safety hazard.
Description
Technical Field
The utility model belongs to the electric tool field especially relates to a load starting circuit and electric tool.
Background
At present, among the current electric tool, be provided with starting switch between battery package and motor, normal operating sequence is: inserting a battery pack → closing a starting switch, enabling the MCU to be electrified → outputting a signal to start the motor by the MCU. This sequence of operation is relatively safe by activating the switch to activate the motor.
However, when the user is using, the following abnormal operations may occur: firstly, closing a starting switch → inserting a battery pack, and enabling the MCU to have electricity → outputting a signal to start the motor by the MCU. The abnormal operation sequence is that the battery pack is plugged to be powered on in a starting state, and the motor can also be started, but the starting belongs to abnormal starting, and a user is easily injured by mistake.
Accordingly, there is a need to prevent abnormal operation from starting the power tool motor, thereby avoiding potential safety hazards.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a load starting circuit aims at solving the problem that the abnormal operation starter motor leads to the potential safety hazard.
An embodiment of the utility model provides a load starting circuit, include:
MCU；
one end of the starting switch is used for connecting a battery pack, and the other end of the starting switch is connected with the MCU;
one end of the battery pack detection module is used for connecting a battery pack, and the other end of the battery pack detection module is connected with the MCU;
the battery pack detection module includes:
the first end of the first resistor is used for being connected with the battery pack;
the first end of the first resistor is connected with the first end of the first resistor, and the second end of the first resistor is grounded;
a capacitor connected in parallel with the second resistor;
and the control end of the first switch tube is connected with the second end of the first resistor, the input end of the first switch tube is connected with the MCU, and the output end of the first switch tube is grounded.
Furthermore, the battery pack detection module further comprises a first voltage stabilizing diode, wherein the anode of the first voltage stabilizing diode is connected with the first resistor, and the cathode of the first voltage stabilizing diode is used for being connected with the battery pack.
Furthermore, the battery pack detection module further comprises a second voltage stabilizing diode connected with the capacitor in parallel, and the anode of the second voltage stabilizing diode is grounded.
Furthermore, the first switch tube includes a first MOS tube or a first transistor.
Furthermore, the circuit further comprises a discharging module, wherein one end of the discharging module is connected with the battery pack detection module, and the other end of the discharging module is connected with the MCU.
Still further, the discharge module includes:
the output end of the second switching tube is grounded;
one end of the third resistor is connected with the battery pack detection module, and the other end of the third resistor is connected with the input end of the second switch tube;
one end of the fourth resistor is connected with the MCU, and the other end of the fourth resistor is connected with the control end of the second switch tube;
one end of the fifth resistor is connected with the control end of the second switch tube, and the other end of the fifth resistor is connected with the output end of the second switch tube.
Furthermore, the second switch tube includes a second MOS tube or a second triode.
The utility model also provides an electric tool, include: the tool comprises a tool main body, a motor arranged in the tool main body, a battery pack for providing energy for the motor and the load starting circuit, wherein the motor is connected with a load connected in the load starting circuit.
The embodiment of the utility model provides a through setting up battery package detection module, because the electric capacity among the battery package detection module charges needs time, detect out and be earlier male battery package or earlier closed starting switch to prevent starter motor under the abnormal operation, avoid taking place the potential safety hazard.
Drawings
Fig. 1 is a schematic structural diagram of a load starting circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another load starting circuit according to an embodiment of the present invention;
fig. 3 is a circuit diagram provided by an embodiment of the present invention.
1. A battery pack; 2. starting a switch; 3. a load; 4. MCU; 5. a battery pack detection module; 6. a discharge module; 7. a voltage converter.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment of the utility model provides a through setting up battery package detection module, because the electric capacity among the battery package detection module charges needs time, detect out and be earlier male battery package or earlier closed starting switch to prevent starter motor under the abnormal operation, avoid taking place the potential safety hazard.
Example one
As shown in fig. 1, fig. 1 is a schematic structural diagram of a load starting circuit according to an embodiment of the present invention.
The load starting circuit includes:
an MCU 4(Micro Control Unit) for controlling the start of the load 3;
the starting switch 2 is arranged between the battery pack 1 and the MCU4, one end of the starting switch is used for being connected with the battery pack 1, and the other end of the starting switch is connected with the MCU 4;
and the battery pack detection module 5 is arranged between the battery pack 1 and the MCU4, one end of the battery pack detection module is used for connecting the battery pack 1, and the other end of the battery pack detection module is connected with the MCU 4.
Referring to fig. 3, the battery pack detection module 5 includes:
a first resistor R13 having a first terminal for connection to the battery pack 1;
a second resistor R19 having a first end connected to the second end of the first resistor R13 and a second end connected to GND;
a capacitor C3 connected in parallel with the second resistor R19;
a control end of the first switch tube Q4 is connected with the second end of the first resistor R13, an input end thereof is connected with the MCU4, and an output end thereof is grounded GND.
Specifically, the MCU4 can be called a singlechip, and STC89C51/52 or AT89S51/52 and the like can be adopted; the load 3 may be a motor; the starting switch 2 can be a single-pole single-throw switch; the battery pack 1 is used for providing driving electric energy for the electric appliance to drive the electric appliance to work, the battery pack 1 is connected with the starting switch 2, and when the starting switch 2 is closed and conducted, the battery pack 1 can provide the electric energy for the starting switch 2.
The battery pack detection module 5 is configured to output a detection signal to the MCU4 to determine whether the battery pack is inserted first. Specifically, the battery pack is inserted first, at this time, the starting switch 2 is not closed and conducted, the battery pack quickly charges the capacitor C3, and then the first switch tube Q4 is conducted, at this time, the MCU4 receives a low-level signal after the first switch tube Q4 is conducted, and the signal represents that the load can be started normally; the starting switch 2 is firstly closed and conducted, then the battery pack is inserted, at this time, because the capacitor C3 needs time for charging, the first switch tube Q4 cannot be conducted immediately, and the MCU4 firstly receives a high level signal output by the battery pack 1 through the starting switch 2, which represents an abnormal condition and cannot start a load normally.
When the MCU4 detects the detection signal, the basis of whether to start the motor is made according to the difference of the detection signal. When the MCU4 detects that the detection signal is a normal start signal (low level signal), the motor is started, and when the MCU4 detects that the detection signal is an abnormal signal (high level signal), the motor is not started.
The first resistor R13 is used to protect the battery pack detection module 5. The second resistor R19 is used to charge the capacitor C3.
The resistance of the first resistor R13 may be 205 (where the first two digits of 205 are valid arrays and the last digit is 10 th power, 205 ═ 200K Ω), and the resistance of the second resistor R19 may be 105.
In this embodiment, if the start switch is closed first, and then the battery pack 1 is inserted, the capacitor C3 of the battery pack detection module 5 needs time for charging, and cannot immediately give the MCU4 a low level signal, the MCU4 detects the high level signal first, and if the battery pack 1 is inserted first, the capacitor C3 charges, the first switch tube Q4 is turned on, the start switch 2 is closed again, and the MCU4 detects the low level signal first.
The working principle of the embodiment is as follows:
when the operation sequence is that the battery pack 1 is inserted first and then the starting switch 2 is closed, after the battery pack 1 is inserted, the capacitor C3 in the battery pack detection module 5 is charged, the first switch tube Q4 is switched on, because the charging time of the capacitor C3 is short, the MCU4 detects a low level signal (normal starting signal) first and detects the closing signal of the starting switch 2 after the starting switch is closed, and at this time, it is determined that the operation sequence is a normal operation sequence and the load 3 (motor) is started normally.
When the operation sequence is that the starting switch 2 is closed first and then the battery pack 1 is inserted, after the battery pack 1 is inserted, the capacitor C3 in the battery pack detection module 5 needs time for charging, the first switch tube Q4 cannot be conducted immediately, the battery pack detection module 5 cannot immediately give a low level signal to the MCU4, and at this time, since the MCU4 detects a high level signal (abnormal signal) provided by the starting switch 2 through which the battery pack 1 is conducted immediately after the battery pack 1 is inserted, it is determined that the operation sequence is an abnormal operation sequence, and the MCU4 does not output a starting signal, so that the load 3 (motor) is not started.
Therefore, the utility model discloses make load starting circuit under normal operation order, can the work of safe start load 3, under unusual operation order, then do not start load work, guaranteed the security of load starting circuit when starting load work, improved load starting circuit's security.
The embodiment of the utility model provides a through setting up battery package detection module 5, because electric capacity C3 in the battery package detection module 5 charges the demand time, detect out and be earlier male battery package 1 or earlier closed starting switch 2 to prevent starter motor under the abnormal operation, avoid taking place the potential safety hazard.
In an embodiment of the present invention, referring to fig. 3, the battery pack detection module 5 further includes a first zener diode Z1 disposed between the battery pack 1 and the first resistor R13.
The anode of the first zener diode Z1 is connected to the first resistor R13, and the cathode is used for connecting the battery pack 1.
The first zener diode Z1 can provide a stabilized voltage to the battery pack detection module 5. The parameter of the first zener diode Z1 may be 30V 1/2W or other parameters.
In one embodiment of the present invention, referring to fig. 3, the battery pack detection module 5 further includes a second zener diode Z2 connected in parallel with the capacitor C3.
The anode of the second zener diode Z2 is grounded GND.
The second zener diode Z2 can provide a stable charging voltage for the capacitor C3. The parameter of the second zener diode Z2 can be 15V 1/2W or other parameters.
In an embodiment of the present invention, the first switch tube Q4 is used for controlling the conduction status of the battery pack detection module 5, and includes a first MOS transistor or a first triode.
Specifically, when the first switch Q4 is a first MOS transistor, the control terminal of the first switch Q4 is a G-pole (gate) of the first MOS transistor, and the G-pole of the first MOS transistor is connected to the second terminal of the first resistor R13; the input end of the first switching tube Q4 is the D pole (drain) of the first MOS tube, and the D pole of the first MOS tube is connected with the MCU 4; the output end of the first switch Q4 is the S-pole (source) of the first MOS transistor, and the S-pole of the first MOS transistor is grounded GND. The type of the first MOS transistor may be 2N 7002.
When the first switch tube Q4 is a first triode, the control end of the first switch tube Q4 is the base of the first triode, and the base (B pole) of the first triode is connected with the second end of the first resistor R13; the input end of the first switching tube Q4 is a collector (C pole) of the first triode, and the collector of the first triode is connected with the MCU 4; the output end of the first switching tube Q4 is the emitter (E pole) of the first triode, and the emitter of the first triode is grounded GND. The first triode may be 5551.
In an embodiment of the present invention, referring to fig. 2, the load starting circuit further includes a voltage converter 7, the voltage converter 7 can be a DC-DC converter, and is used for converting the voltage output by the battery pack 1 into a stable voltage, and providing a stable working voltage for the MCU4 and other elements to drive the MCU4 and other elements to work. The output voltage converted by the voltage converter 7 may be a stable 3.3V voltage, or may be a stable 3V, 5V voltage.
Of course, the corresponding voltage converter 7 may be selected according to the magnitude of the operating voltage of the MCU4 or other components, so that the voltage converter 7 can output the operating voltage conforming to the MCU4 or other components, and the voltage output by the voltage converter 7 in this embodiment is mainly a voltage of 3.3V.
Specifically, the voltage converter 7 includes a power input terminal, a first ground terminal, a second ground terminal, and a power output terminal. The power input end is connected with the starting switch 2, the first grounding end is connected with the negative electrode of the battery pack 1, and the second grounding end is grounded.
In one embodiment of the present invention, referring to fig. 3, the load starting circuit further includes a pull-down resistor R3.
One end of the pull-down resistor R3 is connected to a connecting line between the MCU4 and the first switch tube Q4, and the other end is connected to a 3.3V power supply.
The pull-down resistor R3 is used for protecting the first switch tube Q4, so that the first switch tube Q4 is prevented from being damaged when the power supply is switched on, the stability of the load starting circuit is further improved, and the device cost is reduced. The pull-down resistor R3 may have a resistance of 103 or other values.
In the embodiment of the present invention, referring to fig. 2, when the load starting circuit is in the normal control sequence, the control sequence is: inserting the battery pack 1 (step) → closing the starting switch 2 (step ii), electrifying the MCU4 by 3.3V → detecting an input signal by the MCU4 (step iv) → outputting a signal to start the motor by the MCU4 (step iii).
Like this, insert battery package 1 earlier, when the closed starting switch 2 in back, insert the electric capacity C3 charge in battery package detection module 5 behind the battery package 1, first switch tube Q4 switches on, and starting switch 2 is not closed yet, and MCU4 detects the low level, judges this operation order this moment and be normal operation order, can normally start load 3, after closed starting switch 2, then MCU4 can control the motor and start.
When the load starting circuit is in an abnormal (dangerous) control sequence, the operation sequence is as follows: firstly, a starting switch 2 is closed (step two) → the battery pack 1 is plugged (step one), the MCU4 is electrified, 3.3V → the MCU4 detects an input signal (step two) → the MCU4 does not output a signal to start the motor (step three).
Like this, earlier closed starting switch 2, when inserting battery package 1 afterwards, insert battery package detection module 5 behind the battery package 1 and charge and need time, can not give MCU4 low level signal at once, because starting switch 2 has closed, MCU4 detects the high level signal that battery package 1 provided immediately after inserting battery package 1, MCU4 just can not control the motor start so, treat starting switch 2 disconnection after closed start-up motor once more, thereby avoid the motor to start unusually, the mistake is hindered the user, and then improve load starting circuit's security.
The embodiment of the utility model provides a give MCU4 through 5 output detection signals of battery package detection module, judge the operation order between battery package 1 and the starting switch 2. When the operation sequence is that the battery pack 1 is inserted first and then the start switch 2 is closed, the operation sequence is judged to be a normal operation sequence, and the load 3 can be started normally. When the operation sequence is that the starting switch 2 is closed firstly and then the battery pack 1 is inserted, the capacitor C3 in the battery pack detection module 5 needs charging time, the operation sequence is judged to be an abnormal operation sequence at the moment, the load 3 cannot be started normally, and the MCU4 does not output signals, so that the load 3 (motor) is not started, the safety of the load starting circuit when the load 3 is started to work is ensured, and the safety of the load starting circuit is further improved.
It should be noted that, the MCU4 used in the embodiments of the present invention may be a commercially available MCU with a model of STC89C51/52, AT89S51/52, PIC16F1937 or PIC16F 1939. The improvement of the prior art in the claims resides in the hardware component, while the computer program referred to is a simple program whose function can be easily implemented by a person skilled in the art using an existing computer program development platform and well-known programming methods, and does not belong to the improvement proposed to the computer program itself.
Example two
Referring to fig. 1-3, the circuit further includes a discharging module 6, wherein one end of the discharging module 6 is connected to the battery pack detecting module 5, and the other end is connected to the MCU 4. After the operation sequence of the start load 3 is determined, the MCU4 outputs a control signal to the discharging module 6, and the discharging module 6 discharges the capacitor C3 in the battery pack detection module 5, so that the electric quantity in the capacitor C3 can be released, and the capacitor C3 can be charged again before the start load 3 is started next time, and then it can be determined whether the start load 3 is a normal operation sequence or an abnormal operation sequence, and then the operation sequence is used as a basis for starting the motor.
In an embodiment of the present invention, referring to fig. 3, the discharging module 6 includes: and the output end of the second switch tube Q7 and the second switch tube Q7 is grounded. One end of a third resistor R18 and one end of a third resistor R18 are connected with the battery pack detection module 5, and the other end of the third resistor R18 are connected with the input end of a second switch tube Q7. One end of a fourth resistor R22 and one end of a fourth resistor R22 are connected with the MCU4, and the other end of the fourth resistor R22 are connected with the control end of a second switch tube Q7. One end of a fifth resistor R28 and one end of a fifth resistor R28 are connected with the control end of the second switch tube Q7, and the other end of the fifth resistor R28 are connected with the output end of the second switch tube Q7.
Specifically, after the operation sequence of the start load 3 is determined, the MCU control signal may be output to the discharging module 6 through the MCU4, the MCU control signal is transmitted to the control terminal of the second switch tube Q7 through the fourth resistor R22, the second switch tube Q7 is turned on at this time, the electric quantity of the capacitor C3 in the battery pack detection module 5 may flow to the input terminal of the second switch tube Q7 through the third resistor R18, the electric quantity of the capacitor C3 is released to the ground terminal through the output terminal of the second switch tube Q7, at this time, the fifth resistor R28 may prevent the electric quantity output from the output terminal of the second switch tube Q7 from returning to the control terminal of the second switch tube Q7, and the electric quantity release process of the capacitor C3 is further implemented. In this way, before the load 3 is started next time, the capacitor C3 can be charged again, and it can be determined whether the start load 3 is in a normal operation sequence or an abnormal operation sequence, and the determination can be used as a basis for starting the motor. The third resistor R18 may have a resistance of 202 or other values.
In an embodiment of the present invention, the second switching tube Q7 includes a second MOS transistor or a second triode. Specifically, when the second switching transistor Q7 is a second MOS transistor, the control terminal of the second switching transistor Q7 is a G-pole (gate) of the second MOS transistor, and the G-pole of the second MOS transistor is connected to the other end of the fourth resistor R22 and one end of the fifth resistor R28; the input end of the second switching tube Q7 is the D pole (drain) of the second MOS tube, and the D pole of the second MOS tube is connected with the other end of the third resistor R18; the output end of the second switch Q7 is the S-pole (source) of the second MOS transistor, and the S-pole of the second MOS transistor is connected to the ground GND and the other end of the fifth resistor R28. The model of the second MOS tube can be 2N 7002. The resistance of the fourth resistor R22 may be 102 or other resistance, and the resistance of the fifth resistor R28 may be 513 or other resistance.
When the second switch tube Q7 is a second triode, the control end of the second switch tube Q7 is the base (B pole) of the second triode, and the base of the second triode is connected with the other end of the fourth resistor R22 and one end of the fifth resistor R28; the input end of the second switching tube Q7 is a collector (C pole) of the second triode, and the collector of the second triode is connected with the other end of the third resistor R18; the output end of the second switching tube Q7 is an emitter (E pole) of the second triode, and the emitter of the second triode is grounded GND and connected to the other end of the fifth resistor R28. The second switching tube Q7 is used to control the conduction of the discharging module 6. The second triode may be 5551.
In the embodiment of the present invention, referring to fig. 2, when the load starting circuit is in the normal control sequence, the normal control sequence of the load starting circuit is: inserting the battery pack 1 (step) → closing the starting switch 2 (step), enabling the MCU4 to be electrified by 3.3V → detecting an input signal by the MCU4 (step) → outputting an MCU control signal by the MCU4 (step fifthly) → outputting a signal by the MCU4 to start the motor (step III). Like this earlier insert battery package 1, when the back closed starting switch 2, after inserting battery package 1, electric capacity C3 in the battery package detection module 5 charges, and first switch tube Q4 switches on, and MCU4 detects the low level, and at this moment, if closed starting switch 2, then MCU4 can control the load and start. Then, the MCU4 outputs an MCU control signal to the discharging module 6, so that the electric quantity of the capacitor C3 in the battery pack detection module 5 can be released through the discharging module 6, and when the load is started next time, the operation between the battery pack 1 and the starting switch 2 is determined to be smooth again by the charging time of the capacitor C3 and the on/off of the first switch tube Q4, thereby safely controlling the load to be started or not to be started.
When the load starting circuit is in an abnormal (dangerous) control sequence, the abnormal (dangerous) operation sequence is as follows: firstly, a starting switch 2 is closed (step two) → the battery pack 1 is inserted (step one), the MCU4 is electrified, and the voltage is 3.3V → the MCU4 detects an input signal (step two) → the MCU4 outputs an MCU control signal (step five) → the MCU4 does not output a signal to start the motor (step three). Like this earlier closed starting switch 2, when inserting battery package 1 afterwards, after inserting battery package 1, battery package detection module 5 needs the charge time, can not give MCU4 low level signal at once, and MCU4 detects high level signal immediately after inserting battery package 1, MCU4 will export the signal of not starting the load so, start the load when waiting to close the start once more after starting switch 2 disconnection, thereby avoid the motor to start unusually, the mistake impairs the user, and then improves load starting circuit's security. Then MCU4 exports MCU control signal again for discharge module 6 for the electric quantity of electric capacity C3 in battery package detection module 5 can emit in discharging module 6, and when the motor is started next time, judge the operation between battery package 1 and the starting switch 2 smoothly through electric capacity C3's charge time and the break-make of first switch pipe Q4 again, and then the start-up or do not start-up of control load that can be safe.
In the embodiment of the present invention, through having increased battery package detection module 5 and discharge module 6, because electric capacity C3 in the battery package detection module 5 charges the required time, it is first male battery package 1 or closed starting switch 2 first to detect out, in order to prevent starting motor under the abnormal operation, avoid taking place the potential safety hazard, when the operation order is for inserting battery package 1 first, when closed starting switch 2 later, insert battery package 1 after, electric capacity C3 charges, first switch tube Q4 switches on, MCU4 detects the low level signal (normal starting signal) of first switch tube Q4, judge this time that the operation order is normal operation order, can normally start load 3, when starting switch 2 is closed after, MCU4 output signal starts load 3 (motor); when the operation sequence is that the starting switch 2 is closed first and then the battery pack 1 is inserted, after the battery pack 1 is inserted, the capacitor C3 in the battery pack detection module 5 needs charging time, the battery pack detection module 5 cannot immediately give a low level signal to the MCU4, the MCU4 immediately detects a high level signal (abnormal signal) of the battery pack 1 through the closed starting switch 2, at this time, the operation sequence is judged to be an abnormal operation sequence, the load 3 cannot be started normally, and the MCU4 does not output a signal, so that the load 3 (motor) cannot be started; meanwhile, after the operation sequence of the starting load 3 is determined, the MCU4 can control the discharging module 6 to discharge the capacitor C3 in the battery pack detection module 5, so that the electric quantity in the capacitor C3 is released through the discharging module 6, and therefore before the load 3 is started next time, the battery pack detection module 5 can charge the capacitor C3 again, and further whether the work of the starting load 3 is a normal operation sequence or an abnormal operation sequence can be judged, and further the basis of whether the motor is started or not is taken, so that the safety of the load starting circuit in the work of the starting load 3 is ensured while the work of the starting load 3 is ensured.
EXAMPLE III
The utility model also provides an electric tool, include: the tool comprises a tool main body, a motor arranged in the tool main body, a battery pack for providing energy for the motor and the load starting circuit provided by the embodiment, wherein the load 3 connected in the load starting circuit is the motor.
In the embodiment of the present invention, referring to fig. 1-3, the detection signal outputted by the battery pack detection module 5 is used to judge the operation sequence between the battery pack 1 and the start switch 2 for the MCU4, when the operation sequence is to insert the battery pack 1 first and then close the start switch 2, after inserting the battery pack 1, the capacitor C3 is charged, the first switch tube Q4 is turned on, the MCU4 detects a low level signal (normal start signal), at this time, the operation sequence is judged to be a normal operation sequence, and the MCU4 outputs a signal to start the load 3 (motor); when the operation sequence is that the starting switch 2 is closed first and then the battery pack 1 is inserted, after the battery pack 1 is inserted, the capacitor C3 in the battery pack detection module 5 needs charging time, the battery pack detection module 5 cannot immediately give a low level signal to the MCU4, the MCU4 immediately detects a high level signal (abnormal signal) provided by the battery pack 1 through the starting switch 2, and at this time, it is determined that the operation sequence is an abnormal operation sequence, so the MCU4 does not output a signal, so that the load 3 (motor) is not started. The first resistor R13 in the battery pack detection module 5 can protect the battery pack detection module 5, and the second resistor R19 can charge the capacitor C3, so that the load starting circuit can safely start the load 3 to work under a normal operation sequence, and the load 3 can not be started to work under an abnormal operation sequence.
Of course, after the operation sequence of the start load 3 is determined, the MCU4 can control the discharging module 6 to discharge the capacitor C3 in the battery pack detection module 5, so that the electric quantity in the capacitor C3 is released from the discharging module 6, so that the battery pack detection module 5 can charge the capacitor C3 again before the next start load 3, and further determine whether the start load 3 works in a normal operation sequence or an abnormal operation sequence, and further serve as a basis for starting the motor, thereby ensuring the safety of the start load 3 when the load start circuit works, further improving the safety of the start circuit of the load 3, and further improving the safety of the electric tool.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A load start circuit, comprising:
MCU；
one end of the starting switch is used for connecting a battery pack, and the other end of the starting switch is connected with the MCU;
one end of the battery pack detection module is used for connecting a battery pack, and the other end of the battery pack detection module is connected with the MCU;
the battery pack detection module includes:
the first end of the first resistor is used for being connected with the battery pack;
the first end of the first resistor is connected with the first end of the first resistor, and the second end of the first resistor is grounded;
a capacitor connected in parallel with the second resistor;
and the control end of the first switch tube is connected with the second end of the first resistor, the input end of the first switch tube is connected with the MCU, and the output end of the first switch tube is grounded.
2. The load start circuit of claim 1, wherein the battery pack detection module further comprises a first zener diode, wherein an anode of the first zener diode is connected to the first resistor, and a cathode of the first zener diode is connected to the battery pack.
3. The load start circuit of claim 1, wherein the battery pack detection module further comprises a second zener diode connected in parallel with the capacitor, the anode of the second zener diode being connected to ground.
4. The load start-up circuit of claim 1, wherein the first switch transistor comprises a first MOS transistor or a first triode.
5. The load start circuit of any of claims 1-4, further comprising a discharge module having one end connected to the battery pack detection module and another end connected to the MCU.
6. The load start circuit of claim 5, wherein the discharge module comprises:
the output end of the second switching tube is grounded;
one end of the third resistor is connected with the battery pack detection module, and the other end of the third resistor is connected with the input end of the second switch tube;
one end of the fourth resistor is connected with the MCU, and the other end of the fourth resistor is connected with the control end of the second switch tube;
one end of the fifth resistor is connected with the control end of the second switch tube, and the other end of the fifth resistor is connected with the output end of the second switch tube.
7. The load start-up circuit of claim 6, wherein the second switching transistor comprises a second MOS transistor or a second triode.
8. An electric power tool, characterized by comprising: a tool body, a motor disposed within the tool body, a battery pack to power the motor, and a load activation circuit as claimed in any one of claims 1 to 7 in which a load connected to the load activation circuit is the motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021134427.8U CN212627736U (en) | 2020-06-18 | 2020-06-18 | Load starting circuit and electric tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021134427.8U CN212627736U (en) | 2020-06-18 | 2020-06-18 | Load starting circuit and electric tool |
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| CN212627736U true CN212627736U (en) | 2021-02-26 |
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| CN202021134427.8U Active CN212627736U (en) | 2020-06-18 | 2020-06-18 | Load starting circuit and electric tool |
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