High-frequency isolation type tri-level inverter based on forward converter

A three-level inverter and high-frequency isolation technology, which is applied in the direction of converting irreversible DC power input into AC power output, can solve the problem of not reducing the switch tube voltage stress and high-frequency isolation of the Buck-type inverter bridge Type multi-level topology is limited in application occasions, and has not really realized multi-level, etc., to achieve the effect of improving conversion efficiency and power density, good voltage spectrum characteristics, and widening the selection range

Inactive Publication Date: 2013-08-21
NANJING UNIV OF SCI & TECH
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Problems solved by technology

However, the diode-clamped and capacitor-clamped multi-level multi-point flat inverter technologies have defects such as single topology and no electrical isolation: the cascaded multi-level inverter technology with independent DC power supply has complicated circuit topology on the input side Low power factor, low conversion efficiency, low power density and other defects;
It only reduces the voltage stress of the switching tube in the DC/DC converter with high-frequency electrical isolation, but does not really realize mul

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  • High-frequency isolation type tri-level inverter based on forward converter

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Embodiment Construction

[0017] The present invention is a high-frequency isolated three-level inverter based on a forward converter, which consists of sequentially connected input DC power supply U i , voltage-dividing capacitor, high-frequency isolated forward three-level conversion unit, cycloconverter, output filter and output AC load, the inverter is changed to convert unstable high-voltage DC into stable or adjustable sinusoidal AC, And reduce the number of power conversion stages, realize high-frequency electrical isolation, suitable for high-voltage DC-AC conversion occasions, input DC power U i The reference positive pole and the first divider capacitor C 1 The positive connection of the first voltage divider capacitor C 1 The negative pole of the second voltage divider capacitor C 2 The positive connection of the second voltage divider capacitor C 2 The negative pole of the input DC power supply U i The reference negative connection, the first divider capacitor C 1 The anode of the firs...

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Abstract

The invention discloses a high-frequency isolation type tri-level inverter based on a forward converter. The high-frequency isolation type tri-level inverter based on the forward converter is composed of an input direct-current power supply (Ui), a dividing capacitor, a high-frequency isolation type forward tri-level conversion unit, a frequency converter, an output filter and an output alternating-current load, wherein the input direct-current power supply (Ui), the dividing capacitor, the high-frequency isolation type forward tri-level conversion unit, the frequency converter, the output filter and the output alternating-current load are connected in sequence. The high-frequency isolation type tri-level inverter based on the forward converter has two stages of power conversion (direct current DC--high frequency alternating current HFAC--low frequency alternating current LFAC), and has bidirectional power flow, the front end of the output filter is good in voltage spectral characteristic, and the high-frequency isolation type tri-level inverter based on the forward converter has high power density, can reduce the voltage stress of a switching element, and can achieve high-frequency electrical isolation of alternating current load and direct-current power supply.

Description

technical field [0001] The invention belongs to the technical field of power electronic conversion, in particular to a high-frequency isolated three-level inverter based on a forward converter. Background technique [0002] Direct-to-AC (DC-AC) conversion technology is a conversion technology that uses power semiconductor devices to convert DC power into AC power. It is widely used in national defense, industrial and mining enterprises, scientific research institutes, university laboratories and daily life. . [0003] So far, research on DC-AC converters by power electronics researchers at home and abroad has mainly focused on non-electrically isolated, low-frequency and high-frequency electrically isolated two-level DC-AC converters; for multi-level converters The research mainly focuses on multi-level DC-DC, DC-AC and AC-DC converters, while the research on multi-level DC-AC converters is very little, and is only limited to non-isolated, low-frequency or intermediate-freq...

Claims

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Application Information

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IPC IPC(8): H02M7/48
Inventor 徐烨李磊韦余娟
Owner NANJING UNIV OF SCI & TECH
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