With the development of power electronics technology and new permanent magnet materials, DC motors are characterized by their good linearity and excellent control performance in most variable speed motion control and closed-loop servo control systems (such as robots, precision machine tools, automotive electronics, home appliances). Widely used in the field of electrical appliances and industrial processes. At present, DC motor control digitization has become the mainstream trend, and high-performance motor control algorithms are mostly realized by the main control chip. With the emergence of high-speed, multi-function digital signal processor (DSP), more complex motors are made. Control strategies are implemented. In this paper, TMS320F28335 is the main control chip, IRF530 is the driving chip, and IR2110 is the driving control chip. The H-bridge driving control design is applied to the DC motor. This control has achieved good results and has high use value. There are many driving methods for DC motors. The ready-made driver chips are 33886, L298N and TB6539. These chips are controlled based on the H-bridge principle. If you design some high-powered drives, you can only use the discrete components to bridge the H-bridge drive yourself. The H-bridge drive circuit can easily realize the 4-quadrant operation of the motor. The principle topology is shown in Figure 1. The four switch tubes that make up the H-bridge drive circuit operate in the switch state, K1 and K4 are one group, and K2 and K3 are one group. The two sets of switch tubes have complementary working states. When K1 and K4 are turned on and K2 and K3 are cut off, the forward voltage is applied to both ends of the motor to realize the forward rotation of the motor. When K2 and K3 are turned on and K1 and K4 are turned off, the reverse voltage is applied across the motor to realize the reverse of the motor. turn. In actual control, the motor can be switched between 4 quadrants. The four diodes D1~D4 in the circuit are freewheeling diodes to protect the switching elements. The overall idea of ​​the hardware circuit design is: use PWM wave to control the switch K1, K4 and K2, K3 in Figure 1 to control the forward and reverse of the motor, and change the duty cycle of the PWM wave to make the motor get different voltage. Thereby controlling the speed of the motor. The switching element can be selected from a bipolar transistor or a field effect transistor. Since the power FET is a voltage controlled component, it has the characteristics of large input impedance, fast switching speed, no secondary breakdown, and the like, and can meet the requirements of high-speed switching action. In this design, all four switches use IR's N-channel enhancement type power MOSFET tube IRF530, which has a drain current of 14A and can withstand a single pulse current of 49A. The maximum voltage is 100V, and its on-resistance is not more than 0.16Ω. Meet the drive requirements. IR offers a variety of bridge driver ICs, typically IR2110. The chip is a monolithic integrated driver module for dual-channel, gate-driven, high-voltage, high-speed power devices. The highly integrated level-shifting technology in the chip greatly simplifies the control requirements of the power device for logic circuits. Improve the reliability of the drive circuit. In particular, the upper tube is powered by an external bootstrap capacitor, which greatly reduces the number of driving power sources compared to other IC drivers. This design uses IR's IR2110 as the driver chip.
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