Four switches reverse motor direction and control speed.
Four switches drive a motor in both directions: diagonal pairs conduct for forward/reverse. PWM on the low or high side controls speed; brake and coast modes; dead-time prevents shoot-through. Integrated drivers include current sensing and protection.
An L298N or DRV8871 module drives a small robot motor.
An H-bridge reverses a motor and controls its speed from one supply, which is the standard way to drive DC motors in robots and vehicles.
Four switches reverse motor direction and control speed.
An H-bridge reverses a motor and controls its speed from one supply, which is the standard way to drive DC motors in robots and vehicles.
Diagonal pairs of switches are turned on, so current flows through the motor in the opposite direction.
Doing so shorts the supply through the bridge and can destroy the switches, so dead time is inserted in the control signals.
Typical applications include driving a robot wheel forward and backward from a microcontroller, reversing a small DC motor in a toy car and controlling a bidirectional actuator in a camera gimbal.
Study "Actuators" first (topic 83 of 104 in Electronics & Embedded). It covers the groundwork this topic builds on.
Flyback via body diodes. Bootstrap gate drive. Stall current.
An L298N or DRV8871 module drives a small robot motor.
The next topic is "Wireless protocols", which builds directly on this one.
It is classed as Advanced in Electronics & Embedded (topic 84 of 104). It is an advanced topic. It assumes you are comfortable with the intermediate topics in Electronics & Embedded.
Want to practise? Open the interactive course for quick checks, quizzes, simulations and progress tracking.