Non-isolated direct-current converter type differential three-level inverter

A technology of three-level inverters and DC converters, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve the problem of high harmonic content of output voltage and the volume of energy storage components Large, high switching voltage stress and other problems, to achieve the effect of improving conversion efficiency, broadening application occasions, reducing switching stress and energy loss

Inactive Publication Date: 2012-07-18
NANJING UNIV OF SCI & TECH
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Problems solved by technology

Afterwards, Ramon Caceres proposed the Boost DC converter inverter, and some other scholars also successively proposed Buck DC converter and Buck-boost DC converter inverters. Although the above inverters have many advantages, they are all

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  • Non-isolated direct-current converter type differential three-level inverter
  • Non-isolated direct-current converter type differential three-level inverter
  • Non-isolated direct-current converter type differential three-level inverter

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[0015] The present invention is a non-isolated DC converter type differential three-level inverter. composition. Among them, the input terminals of the two bidirectional three-level DC converters are connected in parallel, and the output terminals are connected in series. It can directly convert unstable high-voltage and low-quality direct current into stable and high-quality sinusoidal alternating current, which can realize the function of single-stage buck-boost, reduce the number of power conversion stages, and realize the circuit structure of single-stage power conversion, that is, input high-voltage DC power supply. U i The positive pole of the input filter inductor L i one end is connected, the input filter inductor L i The other end is connected with two non-isolated bidirectional three-level DC converters, input filter capacitor C i connected, the input filter capacitor C i The other ends are respectively connected with the input high voltage DC power supply U i ...

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Abstract

The invention discloses a non-isolated direct-current converter type differential three-level inverter. The circuit structure of the inverter consists of a power supply, an input filter, two bidirectional three-level direct-current converters, an output filter and an alternating current load, wherein the bidirectional three-level direct-current converters are connected in a differential way, i.e. input ends are connected in parallel and output ends are connected in series. By the inverter, the function of converting unstable and low-quality direct-current voltage into stable and high-quality sine alternating-current voltage as required can be realized. A circuit topology family of non-isolated direct-current converter type differential three-level inverters, including Boost type, Buck type, Buck-Boost type, Cuk type, Sepic type and Zeta type, is obtained by changing the type of the bidirectional three-level direct-current converters. The inverter has the characteristics of simple circuit topology, capability of adapting to wider voltage input range, bidirectional power current, single-stage conversion, small volume, light weight, low cost, simple control, high conversion rate, high load adaptability, high dynamic performance and the like, and is applied to a high-voltage input occasion.

Description

technical field [0001] The invention belongs to the technical field of power electronic conversion, in particular to a non-isolated DC converter type differential three-level inverter. Background technique [0002] DC-AC inverter technology is a static converter device that uses power semiconductor devices to convert DC power into sinusoidal AC power with a fixed frequency or adjustable frequency. It is used for AC loads and is widely used in national defense, industrial and mining enterprises, and scientific research. Institutions, university laboratories and everyday life. [0003] At present, domestic and foreign power electronics researchers mainly focus on two aspects of research on DC-AC inverters. One is the research on two-level DC-AC converters such as non-electrically isolated, low-frequency and high-frequency electrically isolated; the other is research on multi-level inverters. The multi-level inverter has the advantages of low voltage stress of the switching t...

Claims

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Application Information

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IPC IPC(8): H02M7/483
Inventor 马锋李磊
Owner NANJING UNIV OF SCI & TECH
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