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Modules step up energy efficiency in home apps

Posted: 12 Jun 2007 ?? ?Print Version ?Bookmark and Share

Keywords:power modules? silicon-on-insulator? IGBT? RoHS?

CiPoS modules from <a href=Infineon" ALIGN="RIGHT">

Infineon Technologies AG has unveiled the new Control Integrated Power System (CiPoS) modules that enable energy efficiencies of up to 94 percent in consumer appliances such as washing machines and air conditioners.

The CiPoS modules incorporate a three-phase inverter power stage with a silicon-on-insulator (SOI) gate driver, boot strap diodes and capacitors, as well as auxiliary circuitry in a compact, high-performance, fully isolated package.

Using Infineon's TrenchStop IGBT and EmCon or emitter controlled diode technology, the modules eliminate up to 23 discrete components compared to a design based on discrete components. This lowers manufacturing costs, including inventory and logistics costs and circuit board space while enabling simple layout and assembly, improved overall reliability, reduced EMI and shorter time-to-market. With a basic drive system, such as used in a fan blower, only requiring nine external components and one MCU, the CiPoS modules represent a ready-to-use solution for all motor drive systems with a power rating of up to 3kW.

The CiPoS modules also offer the industry's lowest junction-to-case resistance, which increases output current by up to 20 percent compared to other modules. For example, the junction-to-case thermal resistance of the IGBTs of the CiPoS module IKCS12F60AA is 3.6C/W and of the EmCon diodes is 4.9C/W. At a nominal operating voltage of 15V, this low resistance results in an output current of 6A, compared to the 5A produced by the closest competitor. This makes a higher output power possible in designs with equivalent-sized heatsinks compared to alternatives or the use of a smaller heatsink for the same power.

Interfacing to the MCU is through direct connection of the control terminals supported by pull-up resistors. A feedback control loop can be easily implemented by adding an external operational amplifier.

The CiPoS family will comprise at least six members, said Infineon. Engineering samples of the first members, which are in RoHS compliant single-in-line modules suited for washing machine and similar applications, are available now. These CiPoS modules include a different number of IGBTs (four or six), feature open or closed emitter and provide varied bending capabilities.

For example, the IKCS12F60AA is priced at $12.50 each in 1000-piece quantities. Dual-in-line versions, suited for higher-power HVAC applications, are planned as well.

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