Seven-level inversion topological unit and seven-level inverter
A seven-level inverter technology, applied to electrical components, AC power input conversion to DC power output, output power conversion devices, etc., can solve the problems of high loss, bulky size, and increased cost
Active Publication Date: 2012-08-22
阳光电源(青海)有限公司
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[0006] The technical problem to be solved in this application is to provide a seven-level inverter topology unit and a seven-level inverter, which are used to solve the problem of the large size of the inverter system in the prior art, increased cost, more losses, and lower efficiency. Low, low current conversion accuracy, at the same time, because the DC power of the existing five-level inverter is provided with different voltages by five levels, which makes the technical problem of low current conversion accuracy
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[0087] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.
[0088] refer to figure 2 , which shows the topology diagram of Embodiment 1 of a seven-level inverter topology unit provided by the present application, the seven-level inverter topology unit includes a switch tube T1, a switch tube T2, a switch tube TA1, and a switch tube TA2 , switching tube TA3, switching tube TB1, switching tube TB2, switching tube TB3, diode D1, diode D2, diode DA1, diode DA2, diode DB1 and diode DB2;
[0089]Each switching tube is connected with a diode in a...
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The invention provides a seven-level inversion topological unit and a seven-level inverter. The seven-level inversion topological unit comprises eight switching tubes which are inversely connected with diodes in parallel and six diodes which are connected with the switching tubes in series. Compared with the prior art, the problems of large volume of the inverter, cost increasing, more consumption and lower efficiency, caused by overvoltage at two ends of a part of the diodes, can be prevented by using a voltage-sharing method and a larger RC (Resistor-Capacitor) absorbing circuit. The seven-level inversion topological unit provided by the invention not only ensures to provide an access for current, but also ensures that the entire inverter has the advantages of less semiconductor device, smaller volume, lower cost, lower power consumption and higher efficiency when single-phase and multi-phase applications are realized. And meanwhile, direct current of the seven-level inverter provided by the invention supplies different voltage for seven levels, so that the current converting precision is improved.
Description
technical field [0001] The present application relates to the technical field of power electronics, in particular to a seven-level inverter topology unit and a seven-level inverter. Background technique [0002] For medium-voltage and large-capacity applications, multi-level inverters are widely used. The current five-level inverters are mainly diode-clamped. The diode-clamped five-level inverter is introduced below. [0003] see figure 1 , which is a topology diagram of a diode-clamped five-level inverter provided in the prior art. [0004] figure 1 Shown is the topology of a half-bridge five-level inverter. Diodes are used for voltage clamping for each switching tube. For example, the first diode DB1 is used to clamp the potential of the lower end of the switching tube T1 to the lower end of the first capacitor C1; the second diode DB2 is used to clamp the potential of the lower end of the switching tube T5 to the lower end of the first capacitor C1. The other diodes...
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IPC IPC(8): H02M7/483
Inventor 宋炀汪洪亮
Owner 阳光电源(青海)有限公司