A folding electric bicycle based on a drv8301 gate drive chip

Abstract

The application discloses a kind of based on the folding electric bicycle of drv8301 gate drive chip, including foldable into skateboard and electric bicycle car body, and for controlling the electric control system of car body;Wherein, the car body includes support frame, support frame is provided with car frame on both sides, folding structure for transforming between skateboard and electric bicycle is arranged on the car frame;The electric control system includes control unit, for controlling the start-stop of car body, speed and brake stop, the purpose of the application is for ordinary electric vehicle on the market, create more convenient, more comfortable electric vehicle, both can enrich people's travel mode, also can be people skateboard entertainment, based on traditional human-powered skateboard and traditional electric bicycle, plus new folding device, supporting electric control mechanism, design a kind of product that electric vehicle and scooter can be switched at will.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric bicycles, in particular to a folding skateboard electric bicycle based on a DRV8301 gate drive chip. BACKGROUND

[0002] Currently, there are mainly two types of power-assisted bicycles on the market. One is an electric power-assisted bicycle with torque sensing and providing assistance according to the torque of the pedal shaft. The other is a power-assisted bicycle that detects the speed of the wheel and provides assistance according to the speed signal. The electric power-assisted bicycle with torque sensor is often much more expensive than the electric power-assisted bicycle that detects the speed of the pedal shaft, and the high price reduces its market share. In addition, there are also some power-assisted bicycles without torque sensors, which use an observation compensation method. This scheme takes the sum of the torque exerted on the pedal shaft by the rider and the environmental resistance as a disturbance, and estimates the disturbance by constructing various forms of torque observers, and compensates for the difference between the environmental resistance and the torque of the person by adjusting the power output of the motor. In short, the electric vehicle currently selected by people for travel is generally controlled by the pedal to control the operation of the electric vehicle.

[0003] In recent years, various micro electric vehicles have appeared on the market. They are mostly small in size, light and flexible, and can be applied in many special environments such as crowded office spaces and narrow search and rescue spaces, and can also be used as a special group of transportation tools, and can be applied in many fields of modern life. According to the number of wheels and the control method, the micro electric vehicle can be divided into double-wheel electric balance car, electric unicycle, electric scooter, electric bicycle and electric motorcycle. However, there is no combination of electric bicycles and electric scooters. The existing brushless motor driver of the electric vehicle is too large in size, which is not convenient to install in a small size electric vehicle, and the expansibility is insufficient. SUMMARY

[0004] The purpose of the present application is to provide a folding skateboard electric bicycle based on a DRV8301 gate drive chip to solve the problems raised in the background art.

[0005] To achieve the above purpose, the present application provides the following technical scheme:

[0006] A folding skateboard electric bicycle based on a DRV8301 gate drive chip, comprising a vehicle body that can be folded into a skateboard and an electric bicycle, and an electric control system for controlling the vehicle body; wherein,

[0007] The vehicle body comprises a support frame, and the support frame is provided with a frame on both sides, and the frame is provided with a folding structure for switching between the skateboard and the electric bicycle;

[0008] The electric control system comprises a control unit for controlling the start-stop, speed and braking of the vehicle body.

[0009] As a further scheme of the present application: the folding structure comprises a sleeve provided at the front end of the frame and rotationally connected to the frame through a rotating shaft, a front fork sleeved in the sleeve, a front wheel mounted on the front fork through a front axle, a seat support rod provided at the rear end of the frame, a seat provided at the top end of the seat support rod, a rear wheel mounted on the seat support rod through a rear axle, a hub motor provided on the rear wheel, a connecting rod rotationally connected to the front end of the frame above the rotating shaft, a connecting shaft rotationally connected between the end portions of the two connecting rods, a fixing seat fixedly connected to the connecting shaft, an extension frame provided at the top end of the fixing seat, a support table provided at the top end of the extension frame, two rotatable handles provided at the top end of the support table, and a limiting structure movably arranged at the bottom of the fixing seat and used for fixedly connecting to the front fork.

[0010] As a further scheme of the present application: the limiting structure comprises a connecting rod sleeved in the inner cavity of the fixing seat, the bottom of the connecting rod extends to the outside of the fixing seat and is provided with a spline shaft, and the top end of the front fork is provided with spline grooves corresponding to the spline shaft at the inner cavity of the sleeve.

[0011] As a further scheme of the present application: the surface of the fixing seat is provided with a T-shaped opening, the surface of the connecting rod is provided with a limiting rod, the diameter of the limiting rod is consistent with the width of the T-shaped opening, and the top end of the limiting rod extends to the outside of the T-shaped opening.

[0012] As a further scheme of the present application: the upper surfaces of the support frames are respectively provided with batteries, the control unit is arranged on the upper surfaces of the support frames, and the surface of the support table is provided with a display screen.

[0013] As a further scheme of the present application: the rear end of the frame is provided with a stop rod.

[0014] As a further scheme of the present application: both sides of the support table are provided with notches, and the bottom of the handle is rotationally connected to the notches through a rotating shaft.

[0015] As a further scheme of the present application: an integrated encoder is arranged at the handle for collecting the rotation angle information of the handle, and the single-chip microcomputer of the control unit realizes the front rotation electronic brake and rear rotation acceleration.

[0016] As a further scheme of the present application: the hub motor is a brushless hub motor.

[0017] Compared with the prior art, the present application has the following beneficial effects:

[0018] 1. The purpose of the present application is to create a more convenient and comfortable electric vehicle for the ordinary electric vehicle on the market, which can enrich people's travel mode and provide people with a scooter entertainment. Based on the traditional human-powered skateboard and traditional electric bicycle, a new folding device is added, and a supporting electric control mechanism is designed. A product that can switch between electric vehicles and scooters at will is designed as a new type of sports and leisure entertainment product, which is widely used by people and suitable for leisure and entertainment and short-distance transportation in parks, amusement parks and other places.

[0019] 2. The present application solves the problem of combining electric bicycles and electric scooters that are not available on the market. The product can be freely switched between electric bicycles and electric scooters, realizing the free conversion of two travel modes. The product is suitable for the public, is light and easy to carry, and is also suitable for teenagers for entertainment. The skateboard can be converted into an electric vehicle and ridden home, which is convenient and easy. The electric folding scooter has two forms, one with a handlebar similar to an electric vehicle, and the other without a handlebar similar to a traditional skateboard. The electric folding scooter with a handlebar can realize steering by rotating the handlebar, and the volume can be greatly reduced after folding the handlebar. The other form of the electric folding scooter is to fold the handlebar and the handlebar, which requires an additional independent remote control for control. It can also be used as a traditional skateboard. The overall portability is good. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structure diagram of a folding skateboard electric bicycle based on a drv8301 gate drive chip.

[0021] Figure 2 It is a structure diagram of a folding skateboard electric bicycle based on a drv8301 gate drive chip.

[0022] Figure 3 It is a structure diagram of a folding skateboard electric bicycle based on a drv8301 gate drive chip.

[0023] Figure 4 It is a connection diagram of a folding skateboard electric bicycle based on a drv8301 gate drive chip.

[0024] Figure 5 It is a state diagram of an electric bicycle based on a folding skateboard electric bicycle based on a drv8301 gate drive chip.

[0025] Figure 6 It is a structure diagram of a folding skateboard electric bicycle based on a drv8301 gate drive chip.

[0026] Figure 7It is a three-wire bridge circuit diagram in a folding electric scooter based on a DRV8301 gate drive chip.

[0027] Figure 8 It is a temperature detection and power supply voltage detection circuit diagram in a folding electric scooter based on a DRV8301 gate drive chip.

[0028] Figure 9 It is a 5V to 3.3V circuit diagram in a folding electric scooter based on a DRV8301 gate drive chip.

[0029] Figure 10 It is a 24V to 12V circuit diagram in a folding electric scooter based on a DRV8301 gate drive chip.

[0030] Figure 11 It is a power supply filter circuit diagram in a folding electric scooter based on a DRV8301 gate drive chip.

[0031] Figure 12 It is a brake circuit diagram in a folding electric scooter based on a DRV8301 gate drive chip.

[0032] Figure 13 It is a DRV8301 drive circuit diagram in a folding electric scooter based on a DRV8301 gate drive chip.

[0033] Figure 14 It is a DRV8301 structure and control circuit diagram in a folding electric scooter based on a DRV8301 gate drive chip.

[0034] In the figure: 1, frame; 2, battery; 3, front fork; 4, front axle; 5, front wheel; 6, seat support rod; 7, saddle; 8, rear axle; 9, rear wheel; 10, hub motor; 11, telescopic frame; 12, control unit; 13, support table; 14, handle; 15, fixing seat; 16, support frame; 17, sleeve; 18, connecting rod; 19, spline groove; 20, spline shaft; 21, T-shaped port; 22, connecting rod; 23, limiting rod; 24, stop lever; 25, connecting shaft. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0036] Please refer toFigures 1-14 In the embodiment of the application, the folding electric scooter based on the DRV8301 gate drive chip comprises a support frame 16, a frame 1 is arranged on both sides of the support frame 16, a sleeve 17 is rotatably connected to the front end of the frame 1 through a rotating shaft, a front fork 3 is sleeved in the sleeve 17, a front wheel 5 is installed on the front fork 3 through a front shaft 4, a seat support rod 6 is arranged at the rear end of the frame 1, a seat 7 is arranged at the top end of the seat support rod 6, and a rear wheel 9 is installed on the seat support rod 6 through a rear shaft 8, a hub motor 10 is arranged on the rear wheel 9, a connecting rod 18 is rotatably connected to the front end of the frame 1 above the rotating shaft, a connecting shaft 25 is rotatably connected between the end portions of the two connecting rods 18, a fixing seat 15 is fixedly connected to the connecting shaft 25, an extension frame 11 is arranged at the top end of the fixing seat 15, a support table 13 is arranged at the top end of the extension frame 11, a battery 2 and a control unit 12 are arranged on the upper surface of the support frame 16, a display screen is arranged on the surface of the support table 13, two rotatable handles 14 are arranged at the top end of the support table 13, an integrated encoder is arranged at the handle 14, the integrated encoder is used for collecting the rotation angle information of the handle 14, and the single-chip microcomputer of the control unit 12 realizes the functions of front rotation electronic brake and rear rotation acceleration, notches are arranged on both sides of the support table 13, the bottom of the handle 14 is rotatably connected to the notches through a rotating shaft, a stop rod 24 is arranged between the rear ends of the frame 1, when the device is folded into a scooter, the two handles are below the stop rod 24, the stop rod 24 blocks and limits the handle 14, a limiting structure for fixedly connecting with the front fork 3 is arranged on the bottom of the fixing seat 15 and can move up and down, the limiting structure comprises a connecting rod 22 sleeved in the inner cavity of the fixing seat 15, the bottom of the connecting rod 22 extends to the outer side of the fixing seat 15 and is provided with a spline shaft 20, the top end of the front fork 3 is provided with a spline groove 19 corresponding to the spline shaft 20 at the inner cavity of the sleeve 17, a T-shaped port 21 is arranged on the surface of the fixing seat 15, a limiting rod 23 is arranged on the surface of the connecting rod 22, the diameter of the limiting rod 23 is consistent with the width of the T-shaped port 21, the top end of the limiting rod 23 extends to the outer side of the T-shaped port 21, and the hub motor 10 is a brushless hub motor. Compared with a common brush motor, the brushless motor has better loadability, a longer service life, smaller operation sound and is easy to realize torque speed control and realize electronic brake through integrated electric control. However, compared with the brush motor, the brushless motor is more complex, and the electric folding scooter adopts the brushless hub motor.

[0037] For the conversion of the two forms, when the scooter form is converted into the electric vehicle form, the front fork is pulled out and then stacked downward, the handle is pulled out and unfolded, and finally the seat is pulled open and fixed. The principle is the same for the conversion of the electric vehicle form into the scooter form, which is simple and easy to operate and can be suitable for most people.

[0038] For the control aspect:

[0039] Compared with the ordinary brush motor, the brushless motor rotor is a permanent magnet, and the stator is a coil. The ordinary brush motor rotor is a coil, and the stator is a permanent magnet. As shown in Figure 6 The stator is a coil, the stator winding is mostly three-phase and connected in star shape, and the rotor is between the stators and is a permanent magnet.

[0040] The brushless motor is driven by continuously powering the three-phase coil to rotate the permanent magnet. This unique structure and driving method makes the brushless motor have better load, longer life, smaller running sound, easy to realize torque speed control, and electronic brake through electronic control. However, the brushless motor is more complex than the brush motor. The electric folding scooter adopts a brushless hub motor, so a complete responsible control system is needed, and other functions are also integrated.

[0041] The motor drive circuit adopts six high-power nmos to form a three-phase bridge drive circuit, as shown in Figure 7 It can drive high-power hub motors, and external power dissipation circuits reduce motor heating during braking. The drive board integrates current, voltage, and temperature detection circuits to detect the running status of the drive board in real time, ensuring the safe operation of the folding scooter. The esp32s single-chip microcomputer is used as the main control chip to compile the control program, which is simpler and has sufficient performance to control the drive circuit. At the same time, compared with the stm32 chip, the cost is lower, and the control board integrates low-power Bluetooth. When the scooter is in a state, it can be remotely controlled by a remote control to drive the scooter. The hub motor hall encoder is connected, combined with the foc algorithm, and the three-phase bridge circuit to realize speed loop control and more accurate control of vehicle speed. The control circuit integrates a voice control system, and the folding electric scooter is not suitable when it enters standby mode, combined with a relay, to realize voice wake-up and voice home. The drv8301 is used as the nmos gate drive chip to ensure stable operation. The handle integrates a magnetic encoder, and the electric vehicle state realizes forward braking and rearward forward movement. Power dissipation resistor circuit is used to dissipate the generated power through the power dissipation resistor circuit during electronic braking, reducing motor heating and prolonging motor life. The power dissipation resistor is made of PCB aluminum substrate, and multiple resistors are placed in series at the bottom of the folding electric scooter. The pcb aluminum substrate has small thickness and strong heat dissipation capacity, which further ensures the braking performance. The main control board integrates an mpu6050 gyroscope sensor to immediately cut off the motor power supply when the scooter mode detects that the scooter is tilted at a large angle, further ensuring safety.

[0042] Among them, DRV8301 can adapt the power supply voltage of 6V to 60V, has 1.7A gate drive current, and 2.3A absorption current, supports 3.3V and 5V interface, can adapt 3.3V and 5V single-chip microcomputer control, integrates a buck power supply, can adjust output voltage and switching frequency, the module is set to 5v, 1.5A output is reduced to 3.3V by ams1117 to power the single-chip microcomputer. With dead time adjustable, overcurrent protection, undervoltage protection, overvoltage protection, overtemperature protection function, cooperate with voltage, current, temperature detection circuit to ensure safe driving. Integrates a sampling current amplifier and a voltage comparator inside, supports single-chip microcomputer to read and write internal register configuration chip mode through spi communication. DRV8301 is a high-integration high-performance gate drive chip, using DRV8301 to design circuit can greatly save circuit board design space, more suitable for small size electric control system, at the same time has better safety.

[0043] The present application solves the problem of the combination of electric bicycles and electric scooters which does not exist in the current market. The product can be freely switched between electric bicycles and electric scooters, realizing the free conversion of two travel modes. The product is suitable for the public, is light and easy to carry, and is also suitable for teenagers for entertainment. The electric folding scooter has two forms, one with a handlebar similar to an electric vehicle, and the other without a handlebar similar to a traditional scooter. The electric folding scooter with a handlebar can realize steering by rotating the handlebar, and the volume can be greatly reduced after folding the handlebar. The other form of the electric folding scooter is to fold up the handlebar and the handle, which requires an additional independent remote control for control. It can also be used as a traditional scooter. The overall portability is good.

[0044] The above is only the preferred embodiment of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can make equivalent replacement or change according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A folding electric skateboard bicycle based on the drv8301 gate driver chip, characterized in that, This includes a foldable frame that can be converted into a skateboard or electric bicycle, and an electronic control system for controlling the frame; among which, The vehicle body includes a support frame (16), and a frame (1) is provided on both sides of the support frame (16). The frame (1) is provided with a folding structure for switching between a skateboard and an electric bicycle. The electronic control system includes a control unit (12) for controlling the vehicle's start-up, speed, and braking. The folding structure includes a sleeve (17) disposed at the front end of the frame (1) and rotatably connected to it via a pivot. A front fork (3) is fitted inside the sleeve (17). A front wheel (5) is mounted on the front fork (3) via a front axle (4). A seat support rod (6) is disposed at the rear end of the frame (1). A seat (7) is disposed at the top of the seat support rod (6). A rear wheel (9) is mounted on the seat support rod (6) via a rear axle (8). A hub motor (10) is disposed on the rear wheel (9). The front end of the frame (1) is... A connecting rod (18) is rotatably connected above the pivot, and a connecting shaft (25) is rotatably connected between the ends of the two connecting rods (18). A fixed seat (15) is fixedly connected to the connecting shaft (25). A telescopic frame (11) is provided at the top of the fixed seat (15). A support platform (13) is provided at the top of the telescopic frame (11). Two rotatable handles (14) are provided at the top of the support platform (13). A limiting structure that can move up and down and is used to fix and connect with the front fork (3) is provided at the bottom of the fixed seat (15). The upper surface of the support frame (16) is provided with batteries (2), the control unit (12) is provided on the upper surface of the support frame (16), and the surface of the support platform (13) is provided with a display screen; The support platform (13) has notches on both sides, and the bottom of the handle (14) is rotatably connected to the notches via a pivot. An integrated encoder is provided at the grip (14) to collect the rotation angle information of the grip (14) and to realize electronic braking for forward rotation and acceleration for backward rotation with the microcontroller of the control unit (12); The hub motor (10) is a brushless hub motor.

2. A folding skateboard electric bicycle based on a drv8301 gate driver chip according to claim 1, characterized in that, The limiting structure includes a connecting rod (22) sleeved in the inner cavity of the fixed seat (15). The bottom of the connecting rod (22) extends to the outside of the fixed seat (15) and is provided with a spline shaft (20). The top of the fork (3) is located in the inner cavity of the sleeve (17) and is provided with a spline groove (19) corresponding to the spline shaft (20).

3. A folding skateboard electric bicycle based on a drv8301 gate driver chip according to claim 2, characterized in that, The surface of the fixed base (15) is provided with a T-shaped opening (21), and the surface of the connecting rod (22) is provided with a limiting rod (23). The diameter of the limiting rod (23) matches the width of the T-shaped opening (21), and the top end of the limiting rod (23) extends to the outside of the T-shaped opening (21).

4. A folding skateboard electric bicycle based on a drv8301 gate driver chip according to claim 1, characterized in that, A stop bar (24) is provided between the rear ends of the frame (1).

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