DC Motor Direction Control and PWM Speed Control Using H-bridge Circui

DC Motor Direction Control and PWM Speed Control Using H-bridge Circuit

Team Members:

Sami Shalak
Yaya Mehmet
Mohamad Duffua

Abstract:

The design of H-bridge circuit which will drive a small dc motor. The project is divided into two phases. First of all, the circuit of the H-bridge is designed in PSPICE, and then the DC motor is modeled as the combination of resistor and inductor. After simulating the design in Pspice, the next step is to build the physical circuit. The H-bridge circuit is commonly used in robotic and known for its bidirectional way. The circuit is defined by four MOSFET, acting as switches, working in pairs. While the PWM signal that controls the switches determines the speed of the motor. Hence the circuit is able to control the direction and the speed of the motor.

Working concept

The circuit is defined by four MOSFET, acting as switch, working in pair. In the forward biased region, the switch S1 and S4 are turning the motor in clock wise direction. In the reverse biased region, the switch S2 and S3 are turning the motor in the counter clock wise. This operation is done due to pulse width modulation (PWM) applied at the gate of the MOSFET.