![]() ![]() To do this in practice, it is standard to drive the MOSFET gates using PWM. ![]() When it comes to driving the motor, the main two things we aim to control are its speed and direction. While the low-side switches (i.e., the FETs connected to GND) are implemented as NMOS devices. ![]() While not always the case, H-bridges are generally designed so that the high-side switches (i.e., the FETs connected to VDD) are implemented as PMOS devices. In practice, the switches in the H-bridge are actually implemented using MOSFETs, as shown in Figure 3.įigure 3. H-bridge implementation using MOSFETs ![]() To turn the motor in an opposite direction, we do the opposite, leaving SW1 and SW4 off while turning on SW2 and SW3 simultaneously. The standard H-bridge Circuit for DC motor controlĪn H-bridge can be a useful circuit for DC motor control, as it controls the direction and speed of a motor by selectively turning a series of these switches on and off.Īs shown in Figure 2, by turning on SW1 and SW4 while SW2 and SW3 are off, we can control direct the flow of current in a specific direction across the motor, thus causing it to turn in one direction.įigure 2. Selectively turning these switches on and off will control the speed and direction of the motor The H-bridge, as shown in Figure 1, consists of four switches, which are usually implemented using metal–oxide–semiconductor field-effect transistors ( MOSFETs) in an “H” shaped topology around a DC motor.įigure 1. An example can be seen in a datasheet from TI. When it comes to driving and controlling a DC motor, the most basic and widely used circuit is the H-bridge. H-bridge Operating Principles-What is an H-bridge Circuit? In this article, we’ll take a look at DC motor control, the H-bridge circuit, and control techniques such as complementary PWM. Fields like robotics and electric vehicles (EVs) require circuitry and firmware control of motors to reliably influence the motion of a given device.Įach type of motor comes with its own control requirements, requiring unique circuitry and understanding for proper operation. Motor control is a fundamental aspect of electronic design in almost any electromechanical application. ![]()
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