Three-level inverter

A three-level inverter, collector technology, applied in electrical components, conversion devices for converting AC power input to DC power output, and output power, etc., can solve problems such as low efficiency, reduce thermal stress, and solve reverse reactions. The effect of poor recovery characteristics and improved conversion efficiency

Active Publication Date: 2017-05-10
EMERSON NETWORK POWER CO LTD
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  • Abstract
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Problems solved by technology

[0015] The technical problem to be solved by the present invention is to provide a three-level inverter for the above-mentioned problem of low efficiency of 3L-NPC or 3L-ANPC

Method used

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Embodiment Construction

[0085] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0086] The invention provides two kinds of three-level inverters, and balances the switching speed of six switching tubes to reach a reasonable value, thereby improving the conversion efficiency of the inverters.

[0087] see Figure 5 , Figure 5 The topology diagram of the three-level inverter provided by an embodiment of the present invention can improve the conversion efficiency of the inverter, so that the switching speeds of the six switching tubes of the three-level inverter can achieve a reasonable trade-off.

[0088] Specifically, the three-level inverter includes:

[0089] The first di...

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Abstract

The invention discloses a three-level inverter, comprising a first direct current source, a second direct current source, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube, and a sixth switch tube. The first switch and the fourth switch are high-speed IGBTs. The second switch tube, the third switch tube, the fifth switch tube and the sixth switch tube are low-speed IGBTs. The beneficial effects of the invention are that through the configuration of the IGBTs of different switching characteristic parameters, system losses are reduced, and the conversion efficiency of the inverter is improved; and in addition, the outer tube adopts the MOSFET to withstand the main switching losses, thereby increasing the switching speed and reducing the switching losses, and the problem of poor reverse recovery characteristics of a MOSFET built-in body diode is solved through an additional diode.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a three-level inverter. Background technique [0002] With the continuous development of power electronics technology, PWM (Pulse Width Modulation) modulation has gradually become the mainstream power electronic converter control method, in UPS (Uninterruptible Power Supply uninterruptible power supply equipment), photovoltaic inverters, wind energy converters and Motor converters and other aspects are more and more widely used. [0003] The number of levels of phase voltage output from the inverter is divided into two-level converters, three-level converters, five-level converters, and multi-level converters. In terms of implementation complexity, it is difficult to implement multi-level converters with five levels or more. At present, two-level and three-level inverters are widely used in the industry. [0004] The two-level converter is relatively simple to impleme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/487
Inventor 张永辉
Owner EMERSON NETWORK POWER CO LTD
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