Electronic brake circuit for electric chain saw
By designing an electronic brake circuit for electric chain saws, and using voltage detection and MCU control module to identify and fix the switching sequence, the problems of low production efficiency and high manufacturing cost caused by mechanical interlocking structures in the prior art are solved, and higher safety and efficiency are achieved.
Patent Information
- Application Number
- CN202421626466.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-10
- Publication Date
- 2025-03-07
- Estimated Expiration
- 2034-07-10
AI Technical Summary
In the prior art, additional mechanical interlocking structures are needed to fix the startup sequence of garden tools, resulting in low production efficiency and high manufacturing costs.
An electronic brake circuit for electric chain saw is designed, including a power supply module, an MCU control module, a voltage detection module, a driving module, a front trigger switch S1 and a rear trigger switch S2. The voltage detection module collects the voltage information of the entire electric chain saw machine in real time, and controls the on and off of the entire electric chain saw machine circuit through the MCU control module and a driving module to realize the identification and fixation of the switching sequence.
There is no need to add a mechanical interlocking structure, which improves the operating safety of the electric chain saw, improves production efficiency, reduces manufacturing costs, and achieves a fast brake and start process.
Smart Images
Figure CN222582303U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of brake circuits, in particular to an electronic brake circuit for an electric chain saw. Background Art
[0002] A brushed DC motor is an electric motor that converts electrical energy into mechanical energy. It is characterized by stable speed, large torque, and simple structure. Brushed DC motors are currently widely used in the field of lithium-ion garden tools. When the power is cut off, the brushed DC motor will continue to run for a period of time due to the motor's rotation inertia, thus affecting the safety performance of the product.
[0003] The traditional solution for controlling the motor brake is to connect two switches in series. When the switch is turned on, the motor starts, and when the switch is turned off, the two ends of the motor are short-circuited. At the same time, in order to improve the safety when using garden tools, an additional mechanical interlocking structure is required to fix the startup sequence of the garden tools, which will reduce production efficiency and increase the manufacturing cost of garden tools. Therefore, improvements are needed. Summary of the invention
[0004] The utility model provides a new electronic brake circuit for an electric chain saw to solve the defects of the prior art that an additional mechanical interlocking structure is needed to fix the startup sequence of garden tools, which causes low production efficiency and high manufacturing cost.
[0005] In order to solve the above technical problems, the utility model is implemented through the following technical solutions:
[0006] An electronic brake circuit for an electric chain saw comprises a power module, an MCU control module, a voltage detection module, a drive module, a front trigger switch S1 and a rear trigger switch S2, wherein the front trigger switch S1 is electrically connected to an input end of the voltage detection module, the rear trigger switch S2 is electrically connected to a battery pack, and the front trigger switch S1 and the rear trigger switch S2 are connected in series; the voltage detection module is used to detect voltage information of the entire electric chain saw, and convert the voltage information of the entire electric chain saw into a V_AD signal and transmit it to the MCU control module, the MCU control module is used to compare the received V_AD signal with its own internal preset value and send feedback information to the drive module, and the drive module is used to control the entire circuit of the electric chain saw to be turned on or off.
[0007] The switching sequence of the front trigger switch S1 and the rear trigger switch S2 will affect the voltage change of the whole circuit of the electric chain saw. The voltage detection module collects the current voltage information of the whole electric chain saw in real time and sends the V_AD signal to the MCU control module. The MCU control module can judge whether the current switching sequence of the front trigger switch S1 and the rear trigger switch S2 meets the starting requirements of the electric chain saw according to the size of the V_AD signal, and control the on and off of the whole circuit of the electric chain saw through the driving module, thereby realizing the recognition and fixation of the switching sequence, improving the operational safety of the electric chain saw, without adding a mechanical interlocking structure, improving production efficiency and reducing manufacturing costs; when the electric chain saw needs to be braked, it is only necessary to press or toggle one of the front trigger switch S1 and the rear trigger switch S2 again, thereby realizing the function of the electronic brake, improving the speed of the braking process, and further improving the safety of use.
[0008] Preferably, in the above-described electronic brake circuit for an electric chain saw, the front trigger switch S1 and the rear trigger switch S2 adopt single-pole double-throw switches, the contact 2 of the front trigger switch S1 is electrically connected to the positive pole of the brushed DC motor, the contact 1 of the front trigger switch S1 and the contact 1 of the rear trigger switch S2 are electrically connected to the negative pole of the brushed DC motor, the contact 3 of the front trigger switch S1 is electrically connected to the contact 2 of the rear trigger switch S2, and the contact 3 of the rear trigger switch S2 is electrically connected to the positive pole of the battery pack; the voltage detection module includes resistors R00, R43, R21 and Resistor R31, one end of the resistor R00 is electrically connected between the contact 2 of the front trigger switch S1 and the positive electrode of the brushed DC motor, and the other end of the resistor R00 is electrically connected between the contact 3 of the front trigger switch S1 and the contact 2 of the rear trigger switch S2; one end of the resistor R43 is grounded, the resistor R21 and the resistor R31 are connected in series, the other end of the resistor R21 and the other end of the resistor R43 are both electrically connected between the positive electrode of the brushed DC motor and the power module, the other end of the resistor R31 is grounded, and the resistor R21 and the resistor R31 constitute a V_AD signal output.
[0009] In the default state, the contact 1 and contact 2 of the front trigger switch S1 remain connected, and the contact 1 and contact 2 of the rear trigger switch S2 remain connected. When only the contact 2 and contact 3 of the front trigger switch S1 are connected, the resistor R00 is short-circuited, and the voltage value of the electric chain saw detected by the voltage detection module is relatively large. Because the contact 1 and contact 2 of the rear trigger switch S2 are still connected, not only the battery pack is not connected to the electric chain saw circuit, causing the whole machine to be powered off and shut down, but also the positive and negative poles of the brushed DC motor are short-circuited, and the brushed DC motor enters energy internal consumption and quickly brakes and stops to protect the user;
[0010] When only the contact 2 and the contact 3 of the rear trigger switch S2 are connected and the contact 1 and the contact 2 of the front trigger switch S1 remain connected, the resistor R00 and the resistor R43 form a voltage divider circuit, so that the voltage value of the whole voltage of the electric chain saw detected by the voltage detection module is small, the positive and negative poles of the brushed DC motor are short-circuited, and the brushed DC motor enters energy internal consumption and quickly brakes to stop;
[0011] When only the front trigger switch S1 is pressed or toggled until contact 2 and contact 3 are connected, the positive and negative poles of the brushed DC motor are still in a short-circuited state through the rear trigger switch S2. Only at the moment when contact 2 and contact 3 of the rear trigger switch S2 are connected, the MCU control module controls the conduction of the entire circuit of the electric chain saw through the drive module according to the size change of the V_AD signal, thereby improving the safety of the electric chain saw when it is turned on and protecting people from injury.
[0012] Preferably, in the above-mentioned electronic brake circuit for an electric chain saw, the voltage detection module further comprises a filter capacitor C11, and the filter capacitor C11 is connected in parallel with the resistor R31.
[0013] The filter capacitor C11 and the resistor R31 form a filter circuit, which improves the smoothness and stability of the V_AD signal output.
[0014] Preferably, in the above-mentioned electronic brake circuit for an electric chain saw, the voltage detection module further includes a clamping diode D4, an anode of the clamping diode D4 is electrically connected between the resistor R31 and the resistor R21, and a cathode of the clamping diode D4 is electrically connected to a 3.3V voltage.
[0015] The clamping diode can limit the voltage, thereby protecting the MCU control module and preventing damage to the MCU control module.
[0016] Preferably, in the above-mentioned electronic brake circuit for an electric chain saw, the driving module adopts a MOS tube.
[0017] The driving module uses MOS tubes with the advantage of fast switching speed, which further improves the speed of controlling the start and stop of the brushed DC motor and facilitates use.
[0018] Preferably, in the above-mentioned electronic brake circuit for an electric chain saw, a PWM communication method is adopted between the MCU control module and the drive module, and the feedback information output by the MCU control module is a PWM signal.
[0019] The MCU control module sends feedback information in the form of PWM signals to the drive module, so that it can quickly and stably control the on and off of the MOS tube, further improving the start and shut-off speed of the drive module to control the brushed DC motor. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a structural block diagram of the utility model;
[0021] Figure 2 The circuit diagram of the voltage detection module, the front trigger switch S1, and the rear trigger switch S2 of the utility model;
[0022] Figure 3 This is a circuit diagram of the drive module of the utility model. DETAILED DESCRIPTION
[0023] The following is combined with Figure 1-3 The present invention is further described in detail with the following specific embodiments, but they are not intended to limit the present invention:
[0024] Example 1
[0025] like Figure 1-Figure 3 As shown, an electronic brake circuit for an electric chain saw includes a power module 1, an MCU control module 2, a voltage detection module 3, a drive module 4, a front trigger switch S1 and a rear trigger switch S2, wherein the front trigger switch S1 is electrically connected to the input end of the voltage detection module 3, the rear trigger switch S2 is electrically connected to a battery pack, and the front trigger switch S1 and the rear trigger switch S2 are connected in series; the voltage detection module 3 is used to detect the voltage information of the entire electric chain saw, and convert the voltage information of the entire electric chain saw into a V_AD signal and transmit it to the MCU control module 2, the MCU control module 2 is used to compare the received V_AD signal with its own preset value and send feedback information to the drive module 4, and the drive module 4 is used to control the entire circuit of the electric chain saw to be turned on or off.
[0026] Preferably, the front trigger switch S1 and the rear trigger switch S2 adopt single-pole double-throw switches, the contact 2 of the front trigger switch S1 is electrically connected to the positive pole of the brushed DC motor, the contact 1 of the front trigger switch S1 and the contact 1 of the rear trigger switch S2 are electrically connected to the negative pole of the brushed DC motor, the contact 3 of the front trigger switch S1 is electrically connected to the contact 2 of the rear trigger switch S2, and the contact 3 of the rear trigger switch S2 is electrically connected to the positive pole of the battery pack; the voltage detection module 3 includes a resistor R00, a resistor R43, a resistor R21 and a resistor R31, and the resistor R10 is electrically connected to the positive pole of the battery pack. One end of the resistor R00 is electrically connected between the contact 2 of the front trigger switch S1 and the positive pole of the brushed DC motor, and the other end of the resistor R00 is electrically connected between the contact 3 of the front trigger switch S1 and the contact 2 of the rear trigger switch S2; one end of the resistor R43 is grounded, the resistor R21 and the resistor R31 are connected in series, the other end of the resistor R21 and the other end of the resistor R43 are both electrically connected between the positive pole of the brushed DC motor and the power module 1, the other end of the resistor R31 is grounded, and the resistor R21 and the resistor R31 constitute a V_AD signal output.
[0027] Preferably, the voltage detection module 3 further includes a filter capacitor C11, and the filter capacitor C11 is connected in parallel with the resistor R31.
[0028] Preferably, the voltage detection module 3 further includes a clamping diode D4, an anode of the clamping diode D4 is electrically connected between the resistor R31 and the resistor R21, and a cathode of the clamping diode D4 is electrically connected to a 3.3V voltage.
[0029] Preferably, the driving module 4 adopts a MOS tube.
[0030] Preferably, a PWM communication mode is adopted between the MCU control module 2 and the driving module 4 .
[0031] Specifically, Figure 3 As shown, the driving module 4 includes a MOS transistor Q02, a MOS transistor Q03, a resistor R5, a resistor R6, a resistor R7, a resistor R8, an NPN transistor Q6 and a chip Q9.
[0032] Contact 1 of chip Q9 is grounded, contact 2 of chip Q9 is electrically connected to 15V voltage, contact 3 of chip Q9 is electrically connected to MCU control module 2, terminal 4 of chip Q9 is electrically connected to resistor R6, and terminal 5 of chip Q9 is electrically connected to the base of NPN transistor Q6; the emitter of NPN transistor Q6 is grounded, the collector of NPN transistor Q6 is electrically connected to resistor R8, and one end of resistor R7 is grounded; the gate of MOS tube Q02 is electrically connected to resistors R6, R7 and the other end of resistor R8, the drain of MOS tube Q02 is electrically connected to the negative pole of brushed DC motor, the source of MOS tube Q02 is electrically connected to one end of resistor R5, and the other end of resistor R5 is grounded; the gate of MOS tube Q03 is electrically connected between resistor R7 and resistor R8, the drain of MOS tube Q03 is electrically connected to the positive pole of brushed DC motor, and the source of MOS tube Q03 is electrically connected to one end of resistor R5.
[0033] More specifically, in the default state, contact 1 and contact 2 of the front trigger switch S1 are connected, and contact 1 and contact 2 of the rear trigger switch S2 are connected.
[0034] When contact 2 and contact 3 of the front trigger switch S1 are connected first, resistor R00 is in a short-circuit state, and the voltage value of the electric chain saw whole machine voltage detected by the voltage detection module 3 is relatively large. Because contact 1 and contact 2 of the rear trigger switch S2 are still connected, not only the battery pack is not connected to the electric chain saw whole machine circuit, causing the whole machine to be powered off and shut down, but also the positive and negative poles of the brushed DC motor are short-circuited, and the brushed DC motor enters energy internal consumption and quickly brakes and stops to protect the user.
[0035] When contact 2 and contact 3 of the rear trigger switch S2 are connected first and contact 1 and contact 2 of the front trigger switch S1 remain connected, resistor R00 and resistor R43 form a voltage divider circuit, so that the voltage value of the electric chain saw whole machine voltage detected by the voltage detection module 3 is smaller, the positive and negative poles of the brushed DC motor are short-circuited, the brushed DC motor enters energy internal consumption and quickly brakes to stop.
[0036] When only the front trigger switch S1 is pressed or toggled until contact 2 and contact 3 are connected, the positive and negative poles of the brushed DC motor are still in a short-circuited state through the rear trigger switch S2. Only at the moment when contact 2 and contact 3 of the rear trigger switch S2 are connected, the MCU control module 2 controls the MOS tube in the drive module 4 to be turned on according to the size change of the V_AD signal. At this time, the entire circuit of the electric chain saw is turned on and starts working, thereby improving the safety of the electric chain saw when it is turned on and protecting people from injury.
[0037] When the electric chain saw needs to be braked, just turn the front trigger switch S1 or the rear trigger switch S2 until contact 1 and contact 2 are connected; when the electric chain saw needs to be turned on again after braking, it needs to be restored to the default state and operated in the switching order of first connecting contact 2 and contact 3 of the front trigger switch S1, and then connecting contact 2 and contact 3 of the rear trigger switch S2.
[0038] In conclusion, the above is only a preferred embodiment of the present invention, and all equivalent changes and modifications made within the scope of the patent application for the present invention should fall within the scope of the present invention.
Claims
1. An electronic brake circuit for an electric chain saw, characterized in that: The electric chain saw comprises a power supply module (1), an MCU control module (2), a voltage detection module (3), a drive module (4), a front trigger switch S1 and a rear trigger switch S2, wherein the front trigger switch S1 is electrically connected to the input end of the voltage detection module (3), the rear trigger switch S2 is electrically connected to a battery pack, and the front trigger switch S1 and the rear trigger switch S2 are connected in series; the voltage detection module (3) is used to detect the voltage information of the electric chain saw as a whole, and convert the voltage information of the electric chain saw as a whole into a V_AD signal and transmit it to the MCU control module (2); the MCU control module (2) is used to compare the received V_AD signal with its own internal preset value and send feedback information to the drive module (4); the drive module (4) is used to control the conduction or disconnection of the circuit of the electric chain saw as a whole.
2. The electronic brake circuit for an electric chain saw according to claim 1, characterized in that: The front trigger switch S1 and the rear trigger switch S2 adopt single-pole double-throw switches, the contact 1 of the front trigger switch S1 and the contact 1 of the rear trigger switch S2 are electrically connected to the negative pole of the brushed DC motor, the contact 2 of the front trigger switch S1 is electrically connected to the positive pole of the brushed DC motor, the contact 3 of the front trigger switch S1 is electrically connected to the contact 2 of the rear trigger switch S2, and the contact 3 of the rear trigger switch S2 is electrically connected to the positive pole of the battery pack; the voltage detection module (3) comprises a resistor R00, a resistor R43, a resistor R21 and a resistor R31, the resistor R One end of the resistor R00 is electrically connected between the contact 2 of the front trigger switch S1 and the positive electrode of the brushed DC motor, and the other end of the resistor R00 is electrically connected between the contact 3 of the front trigger switch S1 and the contact 2 of the rear trigger switch S2; one end of the resistor R43 is grounded, the resistor R21 and the resistor R31 are connected in series, the other end of the resistor R21 and the other end of the resistor R43 are both electrically connected between the positive electrode of the brushed DC motor and the power module (1), the other end of the resistor R31 is grounded, and the resistor R21 and the resistor R31 constitute a V_AD signal output.
3. The electronic brake circuit for an electric chain saw according to claim 2, characterized in that: The voltage detection module (3) further comprises a filter capacitor C11, and the filter capacitor C11 is connected in parallel with the resistor R31.
4. The electronic brake circuit for an electric chain saw according to claim 2, characterized in that: The voltage detection module (3) further comprises a clamping diode D4, the anode of the clamping diode D4 being electrically connected between the resistor R31 and the resistor R21, and the cathode of the clamping diode D4 being electrically connected to a 3.3V voltage.
5. The electronic brake circuit for an electric chain saw according to claim 1, characterized in that: The driving module (4) adopts a MOS tube.
6. The electronic brake circuit for an electric chain saw according to claim 1, characterized in that: A PWM communication method is adopted between the MCU control module (2) and the drive module (4).