H bridge motor driver circuit pdf
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This is the working part of the circuit that controls the motor. At the outset driving a motor might seems like an easy task — just hook the motor up to the appropriate voltage rail and it will start rotating. Also when constructing these circuits DO NOT leave the input pins floating or unconnected to a micrcontroller. Permanent magnet DC motors have been around for many years and come in a variety of sizes and voltages. The diodes D1 to D4 provide a safer path for the back emf from the motor to dissipate and thus it protects the corresponding bipolar transistors from damage. Such a configuration is called a "half bridge". Otto Hunt. Also study the links below on transistor switching circuits before you attempt to build any of these devices. The total power delivered is proportional to the duty cycle. Previous post Next post.