Controlling DC Brush Motors with H-bridge Driver

DC brush motors are increasingly required for a broad range of applications including robotics, portable electronics, sporting equipment, appliances, medical devices, automotive applications, power tools and many others. The motor itself is a preferred alternative because it is simple, reliable and low cost. Equally important, advanced, fully-integrated H-bridge driver ICs are avail-able to control the motor’s direction, speed and braking. This paper will explore the basics of H-bridge drivers and discuss the advancement of the technology from discrete solutions to highly-integrated ICs. It will com-pare linear motor speed control with more advanced, higher-efficiency pulse-width modulation (PWM) techniques.

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