Powerelectronics 7964 Art 068023 Rohm

New 650-V IGBTs Deliver Efficiency with Soft Switching

April 10, 2019
ROHM's latest IGBTs will handle inverter/converter power conversion in consumer appliances as well as industrial equipment.

Two new types of 650-V IGBTs from ROHM combine low conduction loss with high-speed switching characteristics, according to the company. This makes them well-suited for power conversion in general-purpose inverters and converters for consumer appliances, such as ACs and IHs (induction heaters), as well as industrial equipment, including power conditioners, welding machines, and UPS. A total of 21 models are offered, consisting of the RGTV series, which features short-circuit tolerance and the RGW series that delivers fast switching speed.

The emergence of IoT has caused an exponential growth in the volume of data generated, bringing about a need to improve the functionality and capacity of data centers. However, as the number of servers and UPS essential to ensuring stable operation of the main power supply continues to rise, it becomes increasingly difficult to reduce power consumption. In addition, in high-power applications that utilize IGBTs, there’s a need to maintain reliability by simplifying measures against overshoot during switching, which can lead to device failure or malfunction.

In response, ROHM used thin wafer technology and a proprietary structure that optimizes the tradeoff relationship between conduction loss and switching speed. For example, when used in an interleaved PFC circuit, efficiency is improved by 1.2% at light loads and 0.3% under heavy loads, contributing to lower application and power consumption. In addition, optimizing the internal design allowed ROHM to achieve smooth switching characteristics that decrease voltage overshoot by 50% compared with products with equivalent efficiency, reducing the number of parts required along with design load.


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