How to model a TVS, transient voltage suppressor, in PSIM

Albert_Dunford
Albert_Dunford
Altair Employee
edited April 15 in Altair HyperWorks

Modelling a TVS with PSIM

A uni-direction TVS can be modelled with a zener diode. A bi-directional TVS can be modelled with two zener diodes, connected cathode to cathode

 

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From Littlefuse

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Breakdown Resistance

We can calculate the resistance of the device by using the breakdown voltage and current to calculate the slope of the IV curve.

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Ron = (9.2-7) / 43.5 = 50.5m ohms. I am ignoring the 10mA which is insignificant to the 43.5 peak current.

We should set this as an external resistor.

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For the bi-diretional setup set the forward voltage to 0.

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Read the datasheet for the proper Vforward for the uni-directional TVS.

Here are some performance waveformsimage

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