From the course: Electronics Foundations: Semiconductor Devices
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Challenge: Motor control
From the course: Electronics Foundations: Semiconductor Devices
Challenge: Motor control
(upbeat music) - [Instructor] It's time for another challenge. This is your chance to practice using bipolar junction transistors as switches to control an electric motor. A simple brushless DC motor can spin clockwise or counterclockwise depending on the polarity of the supply voltage and the direction of the current through it. If the motor is being controlled by a basic high side or low side switch, that switch can only turn the motor on or off but it can't change the orientation of the voltage or current to control the motor's direction. In many applications, such as when working with robotics, motors need to turn in both the clockwise and counterclockwise direction to move back and forth. And to control motors to do that, it's common to use a configuration of four transistors called an H bridge. The H bridge gets its name because the circuit resembles the capital letter H. It consists of two NPN and two PNP…
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