Inverter simulation in Simulink - Step-by-Step Execution

Concept Flow - Inverter simulation

Start Simulation

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Input DC Voltage

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Generate PWM Signals

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Switching Devices ON/OFF

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Output AC Voltage

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Measure Output Waveforms

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End Simulation

The inverter simulation starts with DC input, generates PWM signals to control switches, produces AC output, and measures waveforms.

Execution Sample

Simulink

1. Set DC input voltage = 100V
2. Generate PWM with 50Hz frequency
3. Switch devices ON/OFF based on PWM
4. Output AC voltage waveform
5. Measure voltage and current

This code simulates an inverter converting DC to AC using PWM control and measures output waveforms.

Execution Table

Step	Action	Input Voltage (V)	PWM Signal	Switch State	Output Voltage (V)	Measurement
1	Initialize DC input	100	N/A	All OFF	0	No output
2	Generate PWM signal	100	PWM ON	Switch ON	Approx 100 (pulsed)	Start waveform capture
3	Switching ON/OFF	100	PWM OFF	Switch OFF	0	Waveform low
4	Repeat PWM cycle	100	PWM ON	Switch ON	Approx 100 (pulsed)	Waveform high
5	Output AC waveform formed	100	PWM varying	Switch toggling	Sine-like AC voltage	Voltage and current measured
6	End simulation	100	N/A	All OFF	0	Final waveform data saved

💡 Simulation ends after completing PWM cycles and capturing output waveforms.

Variable Tracker

Variable	Start	After Step 2	After Step 3	After Step 4	After Step 5	Final
Input Voltage	0	100	100	100	100	100
PWM Signal	N/A	ON	OFF	ON	Varying	N/A
Switch State	All OFF	ON	OFF	ON	Toggling	All OFF
Output Voltage	0	Approx 100	0	Approx 100	Sine-like AC	0
Measurement	None	Start capture	Low waveform	High waveform	Final waveform	Saved data

Key Moments - 3 Insights

Why does the output voltage switch between approx 100V and 0V during PWM?

Because the PWM signal turns the switches ON and OFF rapidly, creating pulses of voltage that approximate AC output (see execution_table steps 2-4).

How does the inverter create a sine-like AC voltage from a DC input?

By varying the PWM duty cycle over time, the output voltage pulses form a waveform that resembles a sine wave (see execution_table step 5).

Why is the switch state 'All OFF' at the start and end of simulation?

The simulation initializes and ends with switches off to represent no output and safe conditions (see execution_table steps 1 and 6).

Visual Quiz - 3 Questions

Look at the execution table, what is the switch state at step 3?

A Toggling

B Switch ON

C Switch OFF

D All OFF

💡 Hint

Check the 'Switch State' column at step 3 in the execution_table.

At which step does the output voltage first approximate 100V?

A Step 2

B Step 3

C Step 1

D Step 6

💡 Hint

Look at the 'Output Voltage' column in the execution_table for when voltage changes from 0.

If the PWM signal stayed OFF all the time, what would the output voltage be?

A Approx 100V pulsed

B 0V

C Sine-like AC voltage

D Constant DC voltage

💡 Hint

Refer to the 'PWM Signal' and 'Output Voltage' columns in the execution_table steps where PWM is OFF.

Concept Snapshot

Inverter simulation converts DC to AC using PWM.
PWM controls switches ON/OFF rapidly.
Output voltage pulses form AC waveform.
Measure voltage and current waveforms.
Simulation starts and ends with switches OFF.

Full Transcript

This inverter simulation starts by setting a DC input voltage. Then it generates PWM signals to control switching devices ON and OFF. These switches create pulsed output voltage approximating AC. The simulation measures output voltage and current waveforms. The switches start OFF, toggle during PWM cycles, and return OFF at the end. The output voltage changes from 0 to pulses near input voltage, forming a sine-like AC waveform. This process is repeated until the simulation ends and waveform data is saved.