Igbt photovoltaic inverter core components

What is the role of IGBT in a power inverter?

IGBT (Insulated Gate Bipolar Transistor) is the heart of the power inverter, assuming the function of power conversion and energy transmission. It is referred to as the core component of the power inverter. IGBT is sensitive to the temperature, voltage, and current of the device.

Why is IGBT a key protection object of a power inverter?

IGBT is the crucial protection object of a power inverter because it is very sensitive to the temperature, voltage, and current of the device. In case of even a slight stand exceeding, IGBT becomes incompetent and cannot be repaired, resulting in the need to replace or overhaul the inverter. The above outlines the three modes of IGBT failure.

Are insulated-gate bipolar transistors a good choice for solar inverter applications?

For solar inverter applications, it is well known that insulated-gate bipolar transistors (IGBTs) ofer benefits compared to other types of power devices, like high-current-carrying capability, gate control using voltage instead of current and the ability to match the co-pack diode with the IGBT.

Can IGBT degradation cause a failure of an inverter?

This IGBT degradation would most likely not cause the failure of an inverter, but could degrade performance. Furthermore, it is highly questionable if a device exhibiting significant instability would operate for the expected lifetime of an inverter (i.e. 5 to 20 years).

What is the difference between power transistor and IGBT?

An IGBT (Insulated Gate Bipolar Transistor) is different from a power transistor in that it is controlled by the voltage applied to its gate rather than the current flowing into its base. The current flowing in the gate of an IGBT is extremely small because the impedance of the control gate is very high.

What is a 4th IGBT?

The fourth IGBT is a trench-gate IGBT optimized to deliver low con-duction and switching losses for high-frequency switching such as in solar inverter applications. An IGBT is basically a bipolar junction transistor (BJT) with a metal oxide semiconductor gate structure.