Complementary dead-zone driving circuit of T-type three-level IGBT

Abstract

The invention discloses a complementary dead-zone driving circuit of a T-type three-level IGBT. The driving circuit comprises a complementary dead-zone circuit module, a fault wave locking circuit module and an optical coupling interlocking circuit module. A driving signal given out by a DSP chip is converted into two complementary driving signals with dead zones. The driving signals are subjected to optical coupling isolation and interlocking, and then is output to a driving plate to drive an IGBT module, so as long as the DSP chip gives out two driving signals, the driving signals can be converted into required four driving signals to drive the T-type three-level IGBT. Through the optical coupling interlocking circuit module, electrical isolation of strong-weak electricity and interlocking are achieved. The two driving signals cannot be strong simultaneously, so a direct-connection short-circuit fault of the IGBT is effectively avoided. When the IGBT fails or stops suddenly, the fault wave locking circuit is capable of immediately locking the driving signals, so reliable turning off of the T-type three-level IGBT is ensured. According to the invention, resources of the DSP are saved; the dead-zone time is adjustable, so the direct-connection short-circuit fault of the IGBT is avoided; and the driving circuit works stably and reliably.

Description

technical field [0001] The invention relates to the technical field of photovoltaic three-level inverters, in particular to a T-type three-level IGBT complementary dead zone drive circuit. Background technique [0002] At present, the National Energy Administration and other three ministries and commissions have launched the photovoltaic "top runner" plan, which aims to promote the application of advanced technology products and industrial upgrading. The photovoltaic "top runner" plan requires that the maximum conversion efficiency of photovoltaic inverters should not be lower than 99%. Not less than 98.2%. Compared with two-level technology, the output voltage of three-level technology is closer to sine wave, with less harmonic content and smaller reactance volume. The use of three-level technology is an effective measure to improve the efficiency of the whole machine. Among them, the T-type three-level module includes four switching tubes (T1, T2, T3, T4), which require fo...

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Problems solved by technology

Among them, the T-type three-level module includes four switching tubes (T1, T2, T3, T4), which require four driving signals. T1 tube and T3 tube, T2 tube and T4 tube are in a complementary relationship, and the dead time must be increased ; The three-phase inverter needs 12 drive signals, which puts forward higher requirements on the resources of the DSP chip, which will inevitably increase the manufacturing cost

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