MOSFET Converter (3ph)
Purpose
3-phase MOSFET converter
Library
Electrical / Converters
Description
Implements a three-phase two-level MOSFET converter with reverse diodes. The gate input is a vector of three signals - one per leg. The upper MOSFET, connected to the positive dc level, is on if the corresponding gate signal is positive. The lower MOSFET is on if the gate signal is negative. If the gate signal is zero both MOSFETs in the leg are switched off.
You can choose between two different converter models:
- The basic MOSFET Converter is modeled using the component MOSFET with Diode. PLECS needs only six internal switches to simulate this converter. Only the on-resistances of the MOSFETs can be entered.
- The MOSFET Converter with Parasitics is based on individual MOSFET and Diode components. In this model you may specify forward voltages and on-resistances separately for the MOSFETs and diodes.
Note Due to the switching conditions of the MOSFET with Diode, this device cannot be turned off actively while the current is exactly zero. This may result in unexpected voltage waveforms if the converter is not loaded.
To resolve this problem, either use the MOSFET Converter with Parasitics, or allow a small non-zero load current to flow by connecting a large load resistance to the converter.
Parameters
For a description of the parameters see the documentation of the MOSFET with Diode, the MOSFET and the Diode.
Probe Signals
The two-level MOSFET converters provide six or twelve probe signals, each a vector containing the appropriate quantities of the individual devices: voltage, current, conductivity, conduction loss and switching loss. The vector elements are ordered top-to-bottom, left-to-right: a+, a-, b+, b-, c+, c-.