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TRANSCRIPT
Hello and welcome to the Forward voltage droplesson.
In the previous lessons, you learned how toconfigure converters for power loss calculation
and how to create thermal models.
This lesson will cover Forward voltage dropas the final component to thermal and losses
modeling in Typhoon.
When current passes through a semiconductordevice, there is a small voltage drop across
the device.
The product of this current and the correspondingvoltage drop yields the power consumed by
the semiconductor while conducting, knownas conduction loss.
This voltage drop across the device oftendepends on the device temperature and the
current being conducted.
As such, multiple parameters are requiredto compute the forward voltage drop.
Within Typhoon converter components, forwardvoltage drop can be enabled in the Losses
property tab using the designated checkbox.
When the Forward voltage drop property isenabled, the forward voltage drop of any semiconductor
devices will be incorporated in the model.
This voltage drop is implemented as a voltagesource in series with an ideal switch.
The value of this voltage source depends onthe same factors mentioned previously.
As you can see, if Losses calculation is enabledand parametrized, no additional properties
appear when Forward voltage drop is enabled.
In this case, Forward voltage drop is calculatedusing the already provided parameters.
When Losses calculation is not previouslyenabled and parameterized, a set of parameters
must be defined for Forward voltage drop.
These parameters are parametrized in the sameway as for power losses.
To learn more about this process, please referto the Power Loss Calculation lesson.
As discussed in the Power Loss Calculationlesson, enabling Losses Calculation will not
impact the Converter model's electrical behavior,meaning that switches and diodes will still
be modeled as ideal.
Power losses are computed and tracked, butno electrical power is lost in the converter.
Forward voltage drop does impact the electricalmodel, however, due to the voltage sources
introduced in the converter.
This means that when you enable Forward voltagedrop, actual conduction losses occur in the
converter model.
As with turn-on and turn-off delays, enablingforward voltage drop allows the behavior of
Typhoon's simulated converters to more closelyemulate physical converters.
If you disable temperature calculation inthe Losses property tab, you will see two
different signal processing outputs - onefor conduction losses and one for switching
losses.
By measuring conduction losses, you will beable to see the power lost due to forward
voltage drop.
If you are interested to see how Forward voltagedrop affects converter models in a simple
example, please refer to the video linkedin the materials tab.
Thank you for your attention.
