Flying capacitor NPC three-level topology

A flying-capacitor, three-level technology, applied in the field of flying-capacitor NPC three-level topology, can solve the problems of increased switch tube damage, inability to protect, low circuit safety, etc., to avoid overvoltage damage and improve the circuit. safety effect

Active Publication Date: 2019-11-19
SUNGROW POWER SUPPLY CO LTD
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Problems solved by technology

[0004] However, when a short circuit occurs in the NPC three-level topology, the switching logic during normal operation is destroyed, and the NPC three-level topology has no clamping effect on the inner tube, which may cause overvoltage damage to the inner tube, which in turn will cause the entire bridge arm and even the entire bridg

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  • Flying capacitor NPC three-level topology
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  • Flying capacitor NPC three-level topology

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[0055] In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0056] In this application, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device comprising a list of elements includes not only those elements, but also no Other elements expressly listed, or which are also inherent to ...

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Abstract

The invention provides a flying capacitor NPC three-level topology, comprising: two half-bus capacitors and at least one bridge arm, wherein the bridge arm comprises a flying capacitor, two inner tubeunits, two outer tube units and two clamping diodes; the capacitance value of the flying capacitor is greater than a specific value. Since the flying capacitor has a clamping effect on the two innertube units and has a large capacitance value, the voltage fluctuation cannot cause the overvoltage of a switching tube no matter what kind of short circuit fault occurs, thereby avoiding the overvoltage damage to the switching tube unit and further improving circuit safety.

Description

technical field [0001] The invention belongs to the technical field of circuit short circuit protection, and more specifically relates to a flying capacitor type NPC three-level topology. Background technique [0002] At present, the voltage stress of each switching tube of the three-level topology is only half of the input voltage, and at the same time it can effectively reduce the harmonic content and improve the quality of the output waveform. It is widely used in voltage applications. [0003] The NPC (Neutral Point Clamp, diode-clamped) three-level topology is the most classic and widely used three-level topology. see figure 1 , an NPC three-level bridge arm is composed of four reverse conduction switch tubes and two clamping diodes, the reverse conduction switch tubes S1 and S4 are outer tubes, and the reverse conduction switch tubes S2 and S3 are inner tubes. The reverse conduction switch can be a MOSFET or an IGBT with a reverse diode. Capacitors Cd1 and Cd2 are ...

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Application Information

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IPC IPC(8): H02M7/483H02M1/32
CPCH02M7/483H02M1/32H02M7/487H02M7/4837H02M1/36H02M1/0095
Inventor 刘威庄加才徐君
Owner SUNGROW POWER SUPPLY CO LTD
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