采用功率三极管作为功率放大器的输出控制直流电机。线性型驱动的电路结构和

The power transistor is used as the output of the power amplifier to control the DC motor. The circuit structure and principle of the linear drive are simple, and the acceleration capability is strong. It uses an H-bridge circuit composed of Darlington tubes (as shown in Figure 2.5). The Darlington tube is controlled by a single-chip computer to make it work in the on-off state with an adjustable duty cycle, and the motor speed can be precisely adjusted. Because this circuit works in the saturation cut-off mode of the tube, the efficiency is very high. The H-type bridge circuit ensures simple control of the speed and direction. The switching speed of the tube is very fast, and the stability is extremely strong. It is a wide range of The PWM speed regulation technology adopted. There are many such chips on the market, I chose L298N. <br>This speed regulation method has the advantages of excellent speed regulation characteristics, smooth adjustment, wide speed regulation range, large overload capacity, can withstand frequent load shocks, and can also achieve frequent stepless quick start, braking and reverse rotation. Therefore, it was decided to use a power transistor as the output of the power amplifier to control the DC motor. <br><br>Two infrared pairs of tubes are placed on both sides of the front track of the trolley body. According to the two photoelectric switches receiving the white line and the black line, the steering of the trolley is controlled to adjust the direction of the car. The test shows that as long as the two are properly installed The position of the photoelectric switch can well realize the tracking function. <br>An infrared pair of tubes is placed on the right side of the trolley. By testing this scheme, the trolley can avoid obstacles and make full use of resources without wasting.

The dc motor is controlled by the output of the power tripod as the power amplifier. The linear drive circuit has simple structure and principle, strong acceleration ability, and uses an H-bridge circuit consisting of Darlington tubes (Figure 2.5). The Darlington tube is controlled by a microcontroller to operate in a switching state with an adjustable duty rate, and the motor speed is precisely adjusted. Because this circuit works in the saturation cut-off mode of the tube, the efficiency is very high, the H-type bridge circuit ensures the simple realization of speed and direction control, the switching speed of the electronic tube is very fast, the stability is also very strong, is a widely used PWM speed control technology. There are a lot of these chips on the market, I chose L298N.<br>This mode of speed control has excellent speed control characteristics, smooth adjustment, wide range of speed control, large overload capacity, can withstand frequent load shocks, but also to achieve frequent stageless rapid start, braking and reversal and other advantages. It was therefore decided to use the output of the power tripod as a power amplifier to control the DC motor.<br><br>The use of two infrared tubes, respectively, placed on the front track of the car body on both sides, according to the two photoelectric switches accepted to the white and black line of the situation to control the car steering to adjust the direction of the car, testing shows that as long as the reasonable installation of the position of the two photoelectric switches can be very good to achieve the function of tracking.<br>Place an infrared tube on the right side of the car. By testing such a scheme, it is possible to achieve a good way for the car to avoid obstacles and make full use of resources without wasting it.

The power triode is used as the output of the power amplifier to control the DC motor. The circuit structure and principle of linear drive are simple, and the acceleration ability is strong. The H-type bridge circuit composed of Darlington tube is adopted (as shown in Figure 2.5). The single chip microcomputer is used to control the Darlington tube and make it work in the switch state with adjustable duty ratio to accurately adjust the motor speed. Because this circuit works in the saturated cut-off mode of the tube, the efficiency is very high. The H-type bridge circuit ensures the simple realization of speed and direction control. The switching speed of the electron tube is very fast, and the stability is also very strong. It is a widely used PWM speed regulation technology. There are many such chips on the market, I chose L298N.<br>This speed regulation mode has the advantages of excellent speed regulation characteristics, smooth adjustment, wide speed regulation range, large overload capacity, can withstand frequent load impact, and can also realize frequent stepless fast start, braking and reversal. Therefore, it is decided to use the power triode as the output of the power amplifier to control the DC motor.<br>Two infrared couplers are respectively placed on both sides of the front track of the car body. According to the situation that the two photoelectric switches receive the white line and the black line, the car steering is controlled to adjust the car direction. The test shows that as long as the position of the two photoelectric switches is properly installed, the tracking function can be well realized.<br>An infrared tube is placed on the right side of the car. Through the test, this scheme can achieve a good car to avoid obstacles, and make full use of resources without waste.<br>