Implementation of a UC3843 PWM-Controlled Buck Converter for Precise Speed Regulation of a DC Motor

This paper is concerned with the design and implementation of a pulse-width modulation-controlled buck converter using an integrated circuit, namely the UC3843, for precision speed regulation of a DC motor. The research work investigates the efficiency of PWM in controlling voltage levels to ensure constant operation of the motor under varied load conditions. The high-performance features of fast reaction time and effective current control that become important in dynamic applications of motors are the basis for choosing UC3843. The most crucial component in power electronic applications is the DC buck converter, which efficiently steps down a greater input voltage to low, regulated output voltage settings. These converters are used in embedded systems, LED drivers, and battery charging, to name a few areas where effective power conversion could be necessary. This project will outline the design and implementation of a buck converter utilizing easily accessible and reasonably priced components. One of the primary inputs taken from the UC3843 PWM controller provides a constant and adjustable output voltage. Other major components involved in this project are the IRFZ44 MOSFET for main switching, the MBR2060CT for the freewheeling current diode, various capacitors and resistors for filtering and stability, and a 220 µH inductor for energy storage and ripple reduction. The brushless DC (BLDC) motor is characterized by its high torque density, high power, and small size. The motor may run at a variety of high-efficiency speeds. Consequently, the motor is appropriate for electric car applications. Additionally, a BLDC motor in an electric automobile has low speed, strong torque, low electromagnetic interference, high endurance, and carbon-free brush maintenance. In this paper, the contribution of each component is highlighted before describing how the converter was assembled and tested.