Technical FAQs 4

What is an IGBT in a 3 phase inverter?

IGBTs are used in three-phase inverters for variable-frequency drives to control the speed of AC motors. This reference design uses a flyback topology and provides isolation compliant with IEC61800-5 and is intended to operate from a pre-regulated 24-V DC input.

What is an IGBT-inverter?

An IGBT-inverter is an inverter build with IGBT power modules to ensure high voltage/power switching functions. The IGBT power module is considered the ‘heart’ of the electrified drive train. Similar to a human heart distributing energy throughout our bodies, the power module functions as a human heart in the electric drive train for EV/HEVs.

How does a high power IGBT work?

High-power IGBTs require isolated gate drivers to control their operations. Each IGBT is driven by a single isolated gate driver that galvanically isolates the high-voltage output from the low-voltage controlled inputs. The emitter of the top IGBT floats, which necessitates using an isolated gate-driver.

How much power does an IGBT use?

A switching frequency of 16 kHz, considered high for typical high-power drives. A gate voltage, swinging from –15 to 15 V. These values are a worst case condition since IGBTs are typically driven with 15 V and either –5 or –8 V. Gate driver total power consumption (P driver) = approximately 600 mW.

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Inverter IGBT rear stage voltage output

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