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How does H-bridge motor driver work?
An H-bridge is built of four switches that control the flow of current to a load. If you close switch 1 and switch 4, the current will flow from the source, through switch 1, and then through the load, then through switch 4, and then back to the load. An H-bridge circuit with S2 and S3 closed.
What is the use of H-bridge?
An H-bridge is an electronic circuit that switches the polarity of a voltage applied to a load. These circuits are often used in robotics and other applications to allow DC motors to run forwards or backwards.
Why do we need H-bridge?
Why are MOSFETs used in H bridge circuit?
Here, the MOSFETs act like an SPDT switch. However, a more elegant solution exists. This circuit is called H-bridge because the MOSFETs form the two vertical strokes and the motor forms the horizontal stroke of the alphabet ‘H’. It is the simple and elegant solution to all motor driving problems.
What should the currents be on a H-bridge DC motor driver?
Theoretically, the above-mentioned MOSFET can handle currents up to 80 A; however, in practice, we can expect to get currents up to 40 A if the MOSFET temperature is kept as low as possible, using a big heatsink or even a fan. Figure 1 shows the schematic diagram of the H-bridge DC motor driver.
What are the advantages of using a H-bridge motor?
The main advantages of using an H-bridge driver are high efficiency, rotation direction change, and braking the motor. In this article/video, I have introduced a complete H-bridge DC motor driver using four IR3205 power MOSFETs and two IR2104 MOSFET drivers.
Which is the gate driver for the H-bridge?
Potentiometer R2 controls the duty cycle. The gate driver is a two-channel regular TC4427, with 1.5A sink/source per line. Here, for further driving current the two channels were parallel. if the frequency is higher the gate driver has to be stronger. The SPDT switch is used to choose the H-bridge leg that controls the path.