H-bridge driver simulation in Simulink - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define the input voltage source block.

Simulink

voltage_source = Simulink.VoltSource([1]);

Drag options to blanks, or click blank then click option'

A5

B10

C12

D15

Attempts:

3 left

💡 Hint

Common Mistakes

Using too high or too low voltage values that are not typical for H-bridge simulation.

The input voltage source is set to 10 volts to simulate a typical H-bridge supply.

2fill in blank

medium

Complete the code to set the PWM frequency for the H-bridge driver.

Simulink

pwm_frequency = [1];  % in Hz

Drag options to blanks, or click blank then click option'

A5000

B2000

C1000

D10000

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing too low frequency causing motor noise or too high causing switching losses.

The PWM frequency is set to 5000 Hz, which is common for motor control to balance efficiency and noise.

3fill in blank

hard

Fix the error in the code that sets the direction control signals for the H-bridge.

Simulink

direction_signal = [1];  % 1 for forward, 0 for reverse

Drag options to blanks, or click blank then click option'

ATrue

B0

C'forward'

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using string values or boolean True/False which cause simulation errors.

The direction signal must be numeric 1 or 0 for Simulink to interpret it correctly.

4fill in blank

hard

Fill both blanks to create a dictionary mapping motor states to PWM duty cycles.

Simulink

duty_cycles = { 'forward': [1], 'reverse': [2] }

Drag options to blanks, or click blank then click option'

A0.8

B0.5

C0.2

D1.0

Attempts:

3 left

💡 Hint

Common Mistakes

Assigning the same duty cycle to both directions, which doesn't simulate direction change.

Forward direction uses 80% duty cycle, reverse uses 20% to control motor speed and direction.

5fill in blank

hard

Fill all three blanks to define the H-bridge output signals based on PWM and direction.

Simulink

outputs = { 'high_side': pwm_signal if direction == [1] else 0, 'low_side': pwm_signal if direction == [2] else 0, 'enable': [3] }

Drag options to blanks, or click blank then click option'

A1

B0

CTrue

DFalse

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up direction values or using False for enable which disables output.

High side is active when direction is 1 (forward), low side when direction is 0 (reverse), and enable is True to activate the H-bridge.