Implements ideal IGBT, GTO, or MOSFET and antiparallel diode


Fundamental Blocks/Power Electronics


The IGBT/Diode block is a simplified mode of an IGBT (or GTO or MOSFET)/Diode pair where the forward voltages of the forced-commutated device and diode are ignored.

Dialog Box and Parameters

Internal resistance Ron

The internal resistance Ron of the IGBT device, in ohms (Ω).

Snubber resistance Rs

The snubber resistance, in ohms (Ω). Set the Snubber resistance Rs parameter to inf to eliminate the snubber from the model.

Snubber capacitance Cs

The snubber capacitance in farads (F). Set the Snubber capacitance Cs parameter to 0 to eliminate the snubber, or to inf to get a resistive snubber.

Show measurement port

If selected, add a Simulink® output to the block returning the diode IGBT current and voltage.

Inputs and Outputs


Simulink signal to control the opening and closing of the IGBT.


The Simulink output of the block is a vector containing two signals. You can demultiplex these signals by using the Bus Selector block provided in the Simulink library.





IGBT/Diode current



IGBT/diode voltage


Assumptions and Limitations

The IGBT/Diode block implements a macro model of the real IGBT and Diode devices. It does not take into account either the geometry of the devices or the complex physical processes [1].

The IGBT/Diode block cannot be connected in series with an inductor, a current source, or an open circuit, unless its snubber circuit is in use.

Use the Powergui block to specify either continuous simulation or discretization of your electrical circuit containing IGBT/Diode blocks. When using a continuous model, the ode23tb solver with a relative tolerance of 1e-4 is recommended for best accuracy and simulation speed.


The power_1phPWM_IGBT example illustrates use of the IGBT/Diode block in voltage-sourced converters. The system consists of two independent circuits illustrating single-phase PWM voltage-sourced converters (VSC):

  1. Half-bridge converter

  2. Full-bridge converter

The converters are built with the IGBT/Diode block which is the basic building block of all VSCs. You may replace these blocks by individual IGBT and diode blocks for a more detailed representation.

VSCs are controlled in open loop with the PWM Generator (2–Level) block available in the Control and Measurements/Pulse & Signal Generators library.

The two circuits use the same DC voltage of 400 Volts, carrier frequency of 1080 Hz and modulation index of 0.8.

Run the simulation and observe the current into the load (trace 1) and the voltage generated by the PWM inverter (trace 2) on the Scope blocks.

See Also

IGBT, Diode

Introduced in R2006a

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