Spice Wolfspeed Models

KonstandinKotsis

Hello all,

I am trying to create a model of my 3 phase inverter system in order to investigate in more details several (mostly EMI related) issues that are arising. At the same time I am referring to the following documents provided by Wolfspeed:

1. Wolfspeed Power Module SPICE Models User Guide
2. Power Module Baseplate Capacitance and Electromagnetic Compatibility

The inverter has 3 CAB450M12XM3 power modules, but for the current model that I am using, I have only included one module.
At the same time, I am using the ADuM4135 gate drivers to drive this module. I did this since the ICs on the gate drivers that come with said modules are exactly these.

Apart from that, in order to really be able to capture all the effects that result in this EMI/noise issues, I have tried to include the parasitic components of the system. These are listed below:

1. DC-Link Bank
   C = 330u
   ESL = 4.3n
   ESR = 0.4m
   This capacitor bank consists of 3 Capacitors connected in parallel.
2. Parasitic loop inductance
   LLoop = 10n
   This is the approximate inductance that I am measuring across the DC Busbar, which stands between the HV Battery input and Module DCIN tab.
3. Parasitic Output inductance.
   Lbbar = 100nF
   This is the approximate inductance I am measuring across the busbar that stands between the phase output tab of the module and the motor phase terminal.
4. Baseplate to (LV)GND/Chassis Resistance
   RBPC1 = 100m
   This is the resistance I am measuring between the baseplate of the module and the casing of the inverter.

My objective is to first create such a model that it replicates the results I am getting with my prototype during testing.
The second step would be to include a model of a common mode filtering (and Y capacitors) and see how would the system improve as a result of this addition.

And so, having given this information, I have the following questions and concerns.

1. Is my approach, in terms of inclusion and modelling of the parasitic components, correct? Are there any other parasitic components that I should include in my model in order to have the system resemble more to the one in reality?
2. Is there an available model of the System shown in figure 27 of the following document: "Power Module Baseplate Capacitance and Electromagnetic Compatibility"?
3. What does the {Rshunt} resistor on the Wolfpseed Spice Example models represent?
4. Following the instructions on the Wolfspeed documents, if I right clock on the symbol of the module that I am using I should be able to open the symbol and bring up the attributes editor.
   If I try to do this however, the only window that comes up is the one shown in the figure.

I am fairly certain that I will have other questions related to this task, but if I could get an answer or help on these issues, that would already be helpful.

Thank you in advance,
Konstandin Kotsis

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