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Single-power supply cascade multi-level converter

A cascaded multilevel, single power supply technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc. The problem of back-to-back connection of AC, DC, and AC power converters cannot be realized due to the level of voltage, so as to achieve the effect of improving the utilization rate of DC voltage, easy expansion and low loss.

Inactive Publication Date: 2011-04-06
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The traditional cascaded multilevel cannot realize the back-to-back connection in the AC-DC power converter, so the application of the cascaded multilevel in the inverter is also limited

Method used

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  • Single-power supply cascade multi-level converter
  • Single-power supply cascade multi-level converter
  • Single-power supply cascade multi-level converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] exist figure 1 In this topology, the topology includes inverter bridge (1), inverter bridge (2), inverter bridge (3), auxiliary switching tube (4) and auxiliary switching tube (5), where the inverter bridge (1) is: capacitor One end of (C1) is connected to the collector of the switching tube (S11) and the collector of the switching tube (S13), and the other end is connected to the emitter of the switching tube (S12) and the emitter of the switching tube (S14), and the switching tube (S11) The emitter of the switch is connected to the collector of the switch (S12), and the emitter of the switch (S13) is connected to the collector of the switch (S14); the inverter bridge (2) is: the positive pole of the DC voltage source is connected to the switch (S21) The collector and the collector of the switching tube (S23), the negative electrode is connected to the emitter of the switching tube (S22) and the emitter of the switching tube (S24), the emitter of the switching tube (S2...

Embodiment 2

[0026] exist figure 2 Among them, the extension includes inverter bridge (1), inverter bridge (2), inverter bridge (3), auxiliary switching tube (4) and auxiliary switching tube (5), wherein the inverter bridge (1) is: capacitor One end of (C1) is connected to the collector of the switching tube (S11) and the collector of the switching tube (S13), and the other end is connected to the emitter of the switching tube (S12) and the emitter of the switching tube (S14), and the switching tube (S11) The emitter of the switch is connected to the collector of the switch (S12), and the emitter of the switch (S13) is connected to the collector of the switch (S14); the inverter bridge (2) is: the positive pole of the DC voltage source is connected to the switch (S21) The collector and the collector of the switching tube (S23), the negative electrode is connected to the emitter of the switching tube (S22) and the emitter of the switching tube (S24), the emitter of the switching tube (S21)...

Embodiment 3

[0029] exist image 3 Among them, the extension includes inverter bridge (1), inverter bridge (2), inverter bridge (3), auxiliary switching tube (4) and auxiliary switching tube (5), wherein the inverter bridge (1) is: capacitor One end of (C1) is connected to the collector of the switching tube (S11) and the collector of the switching tube (S13), and the other end is connected to the emitter of the switching tube (S12) and the emitter of the switching tube (S14), and the switching tube (S11) The emitter of the switch is connected to the collector of the switch (S12), and the emitter of the switch (S13) is connected to the collector of the switch (S14); the inverter bridge (2) is: the positive pole of the DC voltage source is connected to the switch (S21) The collector and the collector of the switching tube (S23), the negative electrode is connected to the emitter of the switching tube (S22) and the emitter of the switching tube (S24), the emitter of the switching tube (S21) ...

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Abstract

The invention belongs to a multi-level power converter technique, particularly relating to a topological structure of a cascade multi-level converter. In the invention, the amount of using direct current power supply is reduced under the condition of outputting the level amount which is the same as that output by the traditional cascade type converter. The implementation method is as follows: a capacitance is used to replace the direct voltage source in the traditional topology, and the capacitance voltage is maintained through disconnected charging for the capacitance. The topological structure is mainly used for a high-voltage and high-power situation, and a multi secondary transformer in the original cascade circuit is omitted. Under the condition that small harmonic wave of the traditional multi-level converter is retained and each power transistor only bears the haploid power supply voltage, sine wave output which is triple as big as power supply voltage amplitude can be obtained, and high-capacity and energy bidirectional circulation are easy to realize.

Description

Technical field: [0001] The invention relates to a multi-level power inverter technology, which adopts a bootstrap method to realize the topological structure of a cascaded multi-level converter of a single power supply. Background technique: [0002] In recent years, the idea of ​​multilevel converter has become a research hotspot in the field of high voltage and high power frequency conversion. The multilevel converter outputs a voltage step wave, so that the output voltage waveform can have smaller harmonics and lower du / dt. As the number of output levels increases, the harmonics of the output voltage will decrease. In addition, the multi-level inverter technology has excellent performance in reducing the switching loss and conduction loss of the system, reducing the withstand voltage of the tube and the EMI of the system. [0003] Multilevel converters can be divided into three structural topologies: diode clamped, capacitor clamped, and cascaded. Diode clamped convert...

Claims

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Application Information

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IPC IPC(8): H02M7/483
Inventor 孙孝峰杜会元李昕
Owner YANSHAN UNIV
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