Matching IGBTs and Gate Drive Circuits for Motor Drive Applications
Eric Persson, International Rectifier
Time: 8:00 AM - Noon
Date: October 13th, 2002
Location: Conference Room 'C' on Conference Level
In the design of motor drives less than 5 HP,
manufacturers often use discrete IGBTs and drivers instead of
"intelligent" modules. This
is especially true in cost-sensitive applications such as appliance or light
industrial drives. The IGBTs and
drive circuits are considered commodity products that should be
interchangeable between various manufacturers.
However, this is not always the case, as differences in IGBT
characteristics make them behave differently using the same gate drive
circuit. These differences may
appear as increased EMI, higher device temperatures, or higher sensitivity to
"nuisance" shutdown for example.
To avoid these problems and the reduced product reliability that they
cause, it is important to have a complete understanding of the interaction
between an IGBT and gate drive circuit.
This course will begin with a review of IGBT and
diode characteristics, and a detailed explanation of how to use and interpret
a datasheet. Next is a review of
gate drive methods, including magnetic, optocoupled, and IC drivers.
Short circuit detection and protection methods are also covered.
The next section covers selecting the proper sized IGBT for a given
application, and determining the desired gate drive characteristics. The course will conclude with several application examples
with PSpice and Saber simulations compared to real-world test data.