4 FAQs about Solar energy storage igbt

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.

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.

How can IGBTs be modulated?

One way to achieve this requirement is by pulse-width modulating the IGBTs at or above 20 kHz at a certain modulation frequency of 50 Hz or 60 Hz. By using pulse-width modulation, output inductors L1 and L2 can be kept reasonably small and will suppress the harmonics efectively.

How does a solar inverter work?

A typical implementation of a solar inverter employs a full-bridge topology using four switches (Fig. 2). Here, Q1 and Q3 are designated as high-side IGBTs while Q2 and Q4 are des-ignated as low-side IGBTs. The IGBT turns off is determined by how fast the minority carrier Fig. 1. Turn-of age waveform at a frequency and recombines.

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