What is H-bridge concept?

What is H-bridge concept?

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.

What is the role of H-bridge in PMDC motor circuit?

An H-Bridge is made up of four switches: two in series, and two in parallel, with the load placed in between the switches. In this configuration the circuit takes an “H” shape. In order to change the direction of the voltage supplied, the H-Bridge controls the switches that deliver power to the load ( S1 ).

What is Mosfet H-bridge?

Overview. An H-bridge is a circuit configuration commonly used to control the speed and direction of a brushed DC motor. To apply a forward voltage across the motor, mosfets 1=4=on and 2=3=off, causing the motor to spin in the forward direction (PWM=100% duty cycle).

What is the advantage of using H-bridge to move DC motors?

H bridge is simply a circuit that allows a voltage to be applied across a load in either direction. They are commonly used for controlling DC motor in moving parts of robots. The advantage of using DC motor is that, we can reverse the polarity of applied voltage across the load without modifying the circuit.

How does a full bridge inverter work?

Definition: A full bridge single phase inverter is a switching device that generates a square wave AC output voltage on the application of DC input by adjusting the switch turning ON and OFF based on the appropriate switching sequence, where the output voltage generated is of the form +Vdc, -Vdc, Or 0.

How does an H-Bridge 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.

Can H-Bridge control speed?

The MOSFETs of the H-Bridge acts as switches which can be used to control the speed of the motor, as well as the rotational direction. If a pulse width modulation (PWM) signal is applied to In1 and logic high to In4, then the MOSFET switches would create a path from Vs to GND through the motor.

How do you check if H-Bridge is working?

To check if the board is working Give VCC and ground as usual. With the motor connected across AOUT1 and AOUT2 the motor should run in the forward direction. If you wish to provide PWM to control the speed of the motor send a pwm signal to AIN2 which is the enable pin (AIN2 is the phase/direction pin).

What is PWM mode on H-bridge microcontroller?

In this mode the P1D pin will be the modulated port; P1A port will active; while P1B, P1C will inactive: On the forward full bridge PWM mode the TR1 transistor will on saturate and the TR4 transistor will on/off base on the PWM signal supplied by P1D port, while the TR2 and TR3 transistors inactive.

How does PWM work on a Microchip PIC microcontroller?

One of the advantages using the Microchip PIC microcontroller Pulse Width Modulation or PWM for short is; this PWM peripheral circuit is designed to control the DC motor using the full bridge mode PWM feature.

What does 100% duty cycle in H-bridge mean?

The ratio between the pulse width and the total length of the pulse (time on plus time off) is called duty cycle, so by saying 100% duty cycle means the DC motor is in it’s full speed and 10% duty cycle the DC motor is in it’s 10% of speed. We are going to use this following H-Bridge circuit schema on our project:

How does the Pic 16F690 H-bridge transistor circuit work?

The circuit above basically is the H-Bridge transistor circuit which connected to the PIC 16F690 PWM pins through the PIC PWM output ports P1A, P1B, P1C and P1D. For more detail how the H-Bridge circuit works you could refer to the “ Using Transistor as a Switch ” posted on this blog.