SOPC-based Research Of PWM Control System Of Brushless DC Motor

Automatic control of pressure regulating speed control dc speed control oftenin order to give priority to, and along with the power electronic technologydevelopment, the pulse width modulation (PWM) dc speed control system insmall and medium-sized power dc transmission in the high-speed development ofthe obtained. In power application of basic replaced the linear power amplifiercircuit, to minimize power devices conduction loss, improve the efficiency of thedriver. Traditional PWM signal is through the external simulation comparatorimplementation, peripheral circuit design is more complicated. This paper basedon the SOPC system of the brushless dc motor speed and direction, controlsusing FPGA internal programmable logic unit the characteristics of the richresources, with the digital comparator instead of simulation comparator PWMsignal generation, the circuit is simple, easy to control.This paper applied the single polarity PWM algorithm of reversible PWMmodel of brushless dc motor drive, compared with other drive mode, singlepolarity reversible PWM model has fast response, good linearity and otheradvantages. Altium Designer6.9application of brushless dc motor driver circuitdesign, the L298N motor drive chip for brushless dc motor driven, usingTLP521-1photoelectric isolating device of the L298N stability control inputsignal. Motor driving voltage through the transformer step-down, bridge rectifiercircuit rectifier voltage and7812of the chip inside the realizationThis paper proposes a method based on the SOPC system, in view of thebrushless dc motor drive and control, through the hardware description languagerealizeing each function controller. For brushless dc motor speed has betterstability, using the fuzzy PID control algorithm to control brushless dc motorspeed. Based on the PID control algorithm to join the fuzzy control theory, solvethe traditional PID parameters is not easy to realize the online adjust problem. Based on VHDL language implementation PWM module, application of FPGAbring ROM storage table will fuzzy control rule table writing system, makebrushless dc motor speed control system more stability and reliability. Based onMatlab and QuartursⅡ simulation software of the waveform of PWM drivermodules and fuzzy PID control algorithm simulation and the results showed thatthe control algorithm can achieve good effect and desired objectives.