H-bridge driver simulation in Simulink - Step-by-Step Execution

Concept Flow - H-bridge driver simulation

Start Simulation

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Input Control Signals

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Evaluate H-Bridge Logic

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Set Motor Terminals Voltage

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Motor Response

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Output Motor Speed & Direction

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End Simulation

The simulation starts by receiving control signals, then applies H-bridge logic to set motor terminal voltages, resulting in motor speed and direction outputs.

Execution Sample

Simulink

1. Set inputs: IN1=1, IN2=0
2. Evaluate H-bridge logic
3. Motor terminals: A=High, B=Low
4. Motor rotates forward
5. Output speed and direction

This simulates the H-bridge driving the motor forward by setting one terminal high and the other low.

Execution Table

Step	IN1	IN2	Motor Terminal A	Motor Terminal B	Motor Direction	Motor Speed
1	0	0	Low	Low	Stopped	0
2	1	0	High	Low	Forward	Positive Speed
3	0	1	Low	High	Reverse	Positive Speed
4	1	1	High	High	Braking	0
5	0	0	Low	Low	Stopped	0

💡 Simulation ends after cycling through all input combinations to show motor behavior.

Variable Tracker

Variable	Start	After Step 1	After Step 2	After Step 3	After Step 4	Final
IN1	0	0	1	0	1	0
IN2	0	0	0	1	1	0
Motor Terminal A	Low	Low	High	Low	High	Low
Motor Terminal B	Low	Low	Low	High	High	Low
Motor Direction	Stopped	Stopped	Forward	Reverse	Braking	Stopped
Motor Speed	0	0	Positive Speed	Positive Speed	0	0

Key Moments - 3 Insights

Why does the motor stop when both IN1 and IN2 are 0?

When both inputs are 0, both motor terminals are low, so no voltage difference exists to drive the motor, resulting in it stopping (see Step 1 and Step 5 in execution_table).

What happens when both IN1 and IN2 are 1 at the same time?

Both motor terminals become high, causing braking because the motor terminals are at the same voltage, preventing rotation (see Step 4 in execution_table).

How does changing IN1 and IN2 control motor direction?

Setting IN1=1 and IN2=0 drives the motor forward; reversing inputs (IN1=0, IN2=1) reverses motor direction (see Steps 2 and 3 in execution_table).

Visual Quiz - 3 Questions

Look at the execution_table at Step 3. What is the motor direction?

A Forward

B Reverse

C Stopped

D Braking

💡 Hint

Check the 'Motor Direction' column at Step 3 in the execution_table.

At which step does the motor experience braking?

A Step 4

B Step 2

C Step 3

D Step 5

💡 Hint

Look for 'Braking' in the 'Motor Direction' column in the execution_table.

If IN1 and IN2 are both set to 0, what will the motor speed be?

A Positive Speed

B Negative Speed

C Zero

D Maximum Speed

💡 Hint

Refer to Steps 1 and 5 in the execution_table for motor speed when inputs are zero.

Concept Snapshot

H-bridge driver simulation controls motor direction and speed.
Inputs IN1 and IN2 set motor terminal voltages.
IN1=1 & IN2=0: motor moves forward.
IN1=0 & IN2=1: motor reverses.
Both inputs 0: motor stops.
Both inputs 1: motor brakes.

Full Transcript

This simulation models an H-bridge driver controlling a motor. The inputs IN1 and IN2 determine the voltage at motor terminals A and B. When IN1 is 1 and IN2 is 0, terminal A is high and B is low, causing the motor to rotate forward. Reversing inputs causes the motor to rotate in reverse. When both inputs are 0, the motor terminals are low, so the motor stops. When both inputs are 1, both terminals are high, causing braking. The execution table shows these states step-by-step, tracking inputs, motor terminal voltages, motor direction, and speed. This helps visualize how the H-bridge controls motor behavior.