PLECS 3.6 Online Help

MOSFET Converter (3ph)

Purpose

3-phase MOSFET converter

Library

Electrical / Converters

Description

pict

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:


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-.