ETE 2801- Lab 5: H-Bridge Motor Control
In this lab, we were tasked to create an H-Bridge from a pair of DPDT relays and to analyze H-Bridge circuits as made by different companies.
An H-Bridge is a type of circuit that allows a DC motor's direction of rotation to be controlled with the use of four switches. This circuit is drawn with it's switches and the motor forming a pattern similar to the letter "H". If used properly, current can flow in either direction across the motor.
The "H-Bridge Relay Circuit" file shows an H-Bridge configuration I drew using the relay board shown in the "Relay Board + Pinout" file. There is a SP3T switch connecting the positive voltage to CH1, CH2, and Ground to act as two on states and one low power off state. This can be done practically with an On-Off-On SPDT type switch. I left Vref disconnected in my diagram. For the diagram drawn, it would be best to ground Vref to act as a LOW reference point.
As for the McManis BJT H-Bridge, its transistors are controlled by three signal lines. Different combinations of signals allow for different modes of operation, and can be shown in a table. Some of these functions are allowing forward and backward motor rotation, as well as PWM control and even dynamically braking the motor. The design of this circuit also disallows any combination of signals from directly shorting the battery.
An H-Bridge is a type of circuit that allows a DC motor's direction of rotation to be controlled with the use of four switches. This circuit is drawn with it's switches and the motor forming a pattern similar to the letter "H". If used properly, current can flow in either direction across the motor.
The "H-Bridge Relay Circuit" file shows an H-Bridge configuration I drew using the relay board shown in the "Relay Board + Pinout" file. There is a SP3T switch connecting the positive voltage to CH1, CH2, and Ground to act as two on states and one low power off state. This can be done practically with an On-Off-On SPDT type switch. I left Vref disconnected in my diagram. For the diagram drawn, it would be best to ground Vref to act as a LOW reference point.
As for the McManis BJT H-Bridge, its transistors are controlled by three signal lines. Different combinations of signals allow for different modes of operation, and can be shown in a table. Some of these functions are allowing forward and backward motor rotation, as well as PWM control and even dynamically braking the motor. The design of this circuit also disallows any combination of signals from directly shorting the battery.
Comments