A single input switched capacitor multilevel inverter and its modulation method

A multi-level inverter and switched capacitor technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve the complex structure of the inverter, the difficulty of control, and the limited application range and other issues

Active Publication Date: 2020-10-27
ZHENGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Diode-clamped and flying-capacitor-type inverters use a large number of clamping diodes and clamping capacitors to increase the number of output levels, but the structure of these two inverters is relatively complex, the control is difficult, and there is a problem of unbalanced capacitor voltage. question
The cascaded H-bridge inverter obtains a higher number of output levels through a series modular structure, but more switching devices and DC input power increase the system cost and limit its application range

Method used

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  • A single input switched capacitor multilevel inverter and its modulation method
  • A single input switched capacitor multilevel inverter and its modulation method
  • A single input switched capacitor multilevel inverter and its modulation method

Examples

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Embodiment

[0054] Such as figure 1 As shown, it is the topological structure diagram of the single-input switched-capacitor multi-level inverter in this embodiment, which consists of a single DC input power supply V dc , switched capacitor structure, auxiliary bidirectional switch and H-bridge unit.

[0055] DC input power V dc Provides stable DC power; switched capacitor circuit realizes power supply V dc with capacitance C 1 、C 2 The series-parallel conversion between them generates a ladder wave level; the auxiliary bidirectional switch connects the switched capacitor circuit and the H-bridge circuit to add additional level output; the H-bridge unit realizes the positive and negative polarity conversion of the output level.

[0056] The switched capacitor structure includes: power switch tube S 5 , S 6 , S 7 , S 8 , S 9 and electrolytic capacitor C 1 、C 2 ;Switch tube S 5 The collector and capacitor C 1 The positive connection of the switch tube S 6 The emitter, switch t...

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Abstract

The invention provides a single-input switched capacitor multi-level inverter and its modulation method. The switching device controls the working state of the capacitor to realize the conversion and transmission of electric energy, and has the advantages of small size, high efficiency, and high power density; The inverter is based on the series-parallel conversion of the switched capacitor structure, which can generate more output levels with fewer power devices, simplifies the topology structure, and reduces the output harmonic content. It has the advantages of small number of devices, simple control, single power input, Capacitive self-balancing and independent application to inductive loads and other advantages.

Description

technical field [0001] The invention relates to the field of electric energy conversion and new energy distributed grid-connected power generation, in particular to a single-input switched capacitor multi-level inverter and a modulation method thereof. Background technique [0002] Due to the increasingly serious problems of global environmental pollution and energy crisis, the development and utilization of abundant, clean and pollution-free renewable energy has attracted more and more attention. In the renewable energy utilization system, the power electronic inverter is the key link of its electric energy conversion and transmission. Multilevel inverters have been extensively studied due to their advantages of high output power quality, low total harmonic distortion, low voltage stress on switching devices, and the need for smaller output filters. [0003] Traditional multilevel inverters include three typical structures: diode clamp type, flying capacitor type, and casc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483H02M7/5387
CPCH02M7/483H02M7/5387H02M1/0003
Inventor 王要强周成龙董亮辉王金凤陈根永梁军王克文王哲
Owner ZHENGZHOU UNIV
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