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Solar inverter power modules save space

Posted: 14 Aug 2007 ?? ?Print Version ?Bookmark and Share

Keywords:solar inverter? power modules? save space?

Microsemi Corp. has developed a line of standard power modules for solar inverters in a SP3 package. The eight solar inverter modules feature full bridge configurations that combine low saturation "Trench & Field Stop" IGBT top switches with fast NPT IGBT bottom switches for unipolar switching. The top IGBTs operate at line frequency, while the bottom IGBTs switch at frequencies from 15kHz to 50kHz.

With a 40.8mm x 73.4mm footprint and a 12mm profile, the low inductance power modules feature solderable terminals for easy mounting. Diodes in the modules are matched to the power transistors for improved solar inverter efficiency. High speed, soft recovery DQ series diodes are designed in parallel with the top IGBTs to provide low recovery losses in combination with the bottom IGBTs. Low forward voltage diodes protect the bottom IGBTs during output current zero crossings. Integrated thermal sensors monitor the module case for over-temperature protection.

The power module line includes five 600V and three 1,200V models. COOLMOS devices are available in one 600V module, allowing it to operate at higher switching frequencies with minimum conduction losses.

The full bride modules include the following:

??APTGV30H60T3G (Trench/NPT): 600V, 30A
??APTGV50H60T3G (Trench/NPT): 600V, 50A
??APTGV75H60T3G (Trench/NPT): 600V, 75A
??APTGV100H60T3G (Trench/NPT): 600V, 100A
??APTCV50H60T3G (Trench/COOLMOS): 600V, 50A
??APTGV15H120T3G (Trench/NPT): 1,200V, 15A
??APTGV25H120T3G (Trench/NPT): 1,200V, 25A
??APTGV50H120T3G (Trench/NPT): 1,200V, 50A

These standard modules can also be upgraded to withstand more demanding environmental conditions. For example, aluminum nitride substrates can replace standard alumina for improved thermal performance. Silicon carbide diodes can replace fast recovery diodes (FREDs) for improved switching losses or increased operating frequency and aluminum silicon carbide (AlSiC) base plates can replace standard copper base plates for reduced weight and extended lifetime against wide temperature cycles.

Pricing ranges from $16.98 to $36.78 in quantities of 1,000 to 5,000.

- Gina Roos

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