Novel I-type three-level driving circuit applicable to NPC (Neutral Point Clamped) and ANPC (Active Neutral Point Clamped)

Abstract

The embodiment of the invention discloses a novel I-type three-level driving circuit applicable to NPC (Neutral Point Clamped) and ANPC (Active Neutral Point Clamped). The novel I-type three-level driving circuit comprises a digital control chip, a fault detection circuit and a push-pull amplification circuit, wherein the digital control chip is arranged at a primary side, the fault detection circuit is arranged at a secondary side, the digital control chip is used for detecting a fault through the fault detection circuit, the push-pull amplification circuit is used for amplifying a PWM (Pulse Width Modulation) control signal and further monitoring PWM instructions of four one-phase I-type three-level IGBTs (Insulated Gate Bipolar Transistors) and respective fault instruction, and the state of an arbitrary IGBT comprises the following three states: switch-on, switch-off and soft switch-off; and for each IGBT, the digital control chip is used for determining which all four tubes are in a state of the three states according to the current PWM instruction and the fault information of the digital control chip and by combining the PWM instructions and the fault information of the other three tubes and controlling the state of each IGBT.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a novel I-type three-level driving circuit suitable for NPC and ANPC. Background technique [0002] The topology of the three-level inverter is based on the series connection of two power electronic switching devices, and a three-level inverter with a pair of clamping diodes at the neutral point, also known as the neutral point clamping type (Neutral Point Clamped (NPC for short) three-level inverter. ANPC is the abbreviation of Active Neutral Point Clamped. There are following problems in prior art: [0003] 1. It is impossible to realize protections such as drive power supply abnormality, connector falling off, PWM signal abnormality and upper computer failure; [0004] 2. The short-circuit protection is correspondingly slow, generally requiring 14-16us, which exceeds the maximum withstand time of semiconductor IGBT by 10us; [0005] 3. The turn-off pe...

AI Technical Summary

Problems solved by technology

[0003] 1. It is impossible to realize protections such as drive power supply abnormality, connector falling off, PWM signal abnormality and upper computer failure;

[0004] 2. The short-circuit protection is correspondingly slow, generally requiring 14-16us, which exceeds the maximum withstand time of semiconductor IGBT by 10us;

[0005] 3. Large commutation circuit shutdown peak height

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