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High-frequency isolated five-level inverter

A high-frequency isolation, five-level technology, applied to electrical components, AC power input conversion to DC power output, output power conversion devices, etc., can solve the problem of reducing the value of output filter inductance and capacitance, and not really realizing multi-level , without reducing the voltage stress of the switch tube of the inverter bridge, etc., to achieve the effect of reducing voltage stress, improving conversion efficiency and power density, and good voltage spectrum characteristics

Inactive Publication Date: 2018-11-13
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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 multi-level at the front end of the output filter inductor, and does not reduce the voltage stress of the switching tube of the inverter bridge. Inductor capacitance values ​​are not reduced by

Method used

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  • High-frequency isolated five-level inverter
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  • High-frequency isolated five-level inverter

Examples

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Effect test

Embodiment 1

[0025] Example 1: Combining figure 2 , a high-frequency isolated five-level inverter circuit topology suitable for high-voltage, high-power inverter applications with high-frequency electrical isolation, that is, the positive pole of the input DC power supply Udc is connected to the positive pole of the first input capacitor C1, The anode of the first input capacitor C1, the drain of the first power switch S1 and the cathode of the first diode D1, the drain of the ninth power switch S9, the cathode of the ninth diode D9, the third power switch The drain of the tube S3 is connected to the cathode of the third diode D3, the negative pole of the first input capacitor C1, the positive pole of the second input capacitor C2, the drain of the fifth power switch tube S5, and the cathode of the fifth diode D5 The source of the first power switch S1, the anode of the first diode D1, the source of the second power switch S2, and the anode of the second diode D2 are connected, and the dr...

Embodiment 2

[0026] Example 2: Combining image 3, a high-frequency isolated five-level inverter circuit topology suitable for high-voltage, high-power inverter applications with high-frequency electrical isolation, that is, the positive pole of the input DC power supply Udc is connected to the positive pole of the first input capacitor C1 , the anode of the first input capacitor C1, the drain of the first power switch S1 and the cathode of the first diode D1, the drain of the ninth power switch S9, the cathode of the ninth diode D9, the third power The drain of the switching tube S3 is connected to the cathode of the third diode D3, the negative pole of the first input capacitor C1, the positive pole of the second input capacitor C2, the drain of the fifth power switching tube S5 and the fifth diode D5 The cathode is connected, the source of the first power switch S1, the anode of the first diode D1, the source of the second power switch S2, and the anode of the second diode D2 are connec...

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Abstract

The invention discloses a high-frequency isolation five-level inverter, which is composed of an input direct current power supply, voltage dividing capacitors, a high-frequency isolation five-level conversion unit, an output frequency converter, an output filter and an output alternating current load connected in sequence; according to the inverter, based on the full-bridge inverter, the voltage is divided by connecting two capacitors at two ends of the input direct current voltage source in parallel, thus the front end of the transformer can generate five levels including Udc, Udc / 2, 0, -U / dc / 2 and -Udc, and the five levels can be simultaneously inducted at a transformation secondary, the voltage stress of a switch tube is reduced, and meanwhile, the waveform quality of output voltages is improved. The inverter has the advantages of two-stage power conversion (DC-HFAC-LFAC), bidirectional power flow, low switch device voltage stress, good frequency spectrum characteristic of front-end voltage of output filter, small size of output filter, and high-frequency electrical isolation of AC load and DC power supply. The inverter is low in switch tube voltage stress, and can be applied to the application fields with higher voltage and large power.

Description

technical field [0001] The invention belongs to the technical field of power electronic conversion, in particular to a high-frequency isolated five-level inverter. Background technique [0002] Direct-to-AC (DC-AC) conversion technology refers to a conversion technology that uses power semiconductor devices to convert DC power into constant-voltage and constant-frequency AC power, referred to as inverter technology, which is widely used in national defense, industrial and mining enterprises, Research institutes, university laboratories and daily life. With the development and application of new energy technology, the application of inverter technology in new energy is also increasing. [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 Research mainly focuses on multi-lev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483
CPCH02M7/483
Inventor 管月李磊师贺马爱华刘馨月郭伟龚坤珊陶兆俊严潇高扬
Owner NANJING UNIV OF SCI & TECH
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