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Cell Overview
1.2.3
Snubberless design
1
A simple, low stray inductance bus, coupled with low self inductance capacitors and nomex insulation, eliminates the
need for snubber capacitors at the IGBT power terminals. This reduces parts count, reduces complexity, and
increases IGBT switching performance.
1.2.4
Fusing
Only 2 phases of each cell input are fused. These fuses are mounted externally to the cell in one easy-to-access
location. This reduces the complexity of the cell and allows the fuses to operate properly.
1.2.5
Cell Control Board
A new cell control board based on the 10000092 series has been developed. All MicroHarmony cells sizes 40-140A
and 200-260A use the same part number cell control board. This reduces parts inventory and allows the board to be
purchased with all of the necessary resistor values and jumper settings. This reduces labor costs.
1.2.6
Gate Clamp Board
A gate clamp board is installed on each dual IGBT module. The board protects the IGBT from over voltage
transients. "Personality" gate resistors and capacitors that are specific to the IGBT used, are installed on this board as
well.
1.2.7
Overload
The MicroHarmony cells have built-in output overload current capability. Standard ratings at 110% 1 min/10 min,
150% 1 min/10 min, and 200% 3 sec/10 min are given.
1-4
MicroHarmony Cell Sizes 40 - 260A Manual
s
19001467: Version 1.0
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