Because of their high-voltage and high-current characteristics, IGBTs are used as switching devices for motor drive systems, uninterruptible power supplies (UPS), induction cookers, and other applications.
Figure (a) shows an example of a motor drive circuit. IGBTs are widely used as switching devices in the inverter circuit (for DC-to-AC conversion) for driving small to large motors. IGBTs for inverter applications are used in home appliances such as air conditioners and refrigerators, industrial motors, and automotive main motor controllers to improve their efficiency.
Figure (b) shows an example of a UPS circuit. IGBTs are in middle- and large-capacity (several kVA or higher-capacity) models, contributing to high efficiency and space saving.
Figure (c) shows an example of an induction-heating (IH) circuit. Induction heating uses LC resonance for zero-voltage switching (ZVS) or zero-current switching (ZCS) to reduce switching loss. Because of high resonance voltage or resonance current, IGBTs are commonly used. Specifically, IGBT applications include induction cookers, induction rice cookers and microwave ovens.