Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Control system and method of hybrid cascaded H-bridge rectifier, output voltage ratio of which being 1: 2

A technology of output voltage and hybrid cascading, applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc., can solve the problem of few researches on multi-level rectifiers, and achieve low switching frequency, The effect of reducing volume and weight and improving system efficiency

Inactive Publication Date: 2018-03-16
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
View PDF3 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Considering the combination of hybrid cascaded inverters with a voltage ratio of 1:2, which is relatively more researched now, the independent power supply generated by rectification is just used as the inverter input, while the existing research on multilevel rectifiers with asymmetric DC side voltage rare

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Control system and method of hybrid cascaded H-bridge rectifier, output voltage ratio of which being 1: 2
  • Control system and method of hybrid cascaded H-bridge rectifier, output voltage ratio of which being 1: 2
  • Control system and method of hybrid cascaded H-bridge rectifier, output voltage ratio of which being 1: 2

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] The present invention will be further explained below in conjunction with the accompanying drawings.

[0024] Such as figure 1 As shown, the main circuit of the cascaded H-bridge rectifier includes an AC input power supply, an input filter inductor, a low-voltage H-bridge unit and a high-voltage H-bridge unit, and two filter capacitors C connected in parallel with the DC side outputs of the low-voltage H-bridge unit and the high-voltage H-bridge unit 1 、C 2 and load, the first to fourth switching tubes Q 11 ~Q 14 The composition output voltage is u dc1 The low-voltage H-bridge unit: the fifth to eighth switching tubes Q 21 ~Q 24 The composition output voltage is u dc2 The high-voltage H-bridge unit, u dc2 Generate u through the voltage divider circuit dc2 / 2, the first to eighth switching tubes all include input terminals, output terminals and control terminals, the input current flows through the filter inductor, low-voltage H-bridge unit and high-voltage H-bri...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a control system and method of a hybrid cascaded H-bridge rectifier, the output voltage ratio of which being 1: 2. By comparing total modulated wave vr1 and output vcmp of a cascaded unit 1:2 voltage division adjuster, a square wave output signal of a high-voltage unit modulator is obtained to drive a switching tube of a high-voltage unit H bridge; and a low-voltage unit modulated wave vr2 obtained after the total modulated wave vr1 subtracts the output signal of the high-voltage unit modulator 4) intersects with a high-frequency single-polarity triangular wave in positive and negative symmetry to obtain an output signal of a low-voltage unit modulator so as to drive a switching tube of a low-voltage unit H bridge. The method can obtain rectification voltage output,the voltage ratio of which is 1:2, so that the high-voltage unit switching tube having large voltage stress is allowed to work under a low frequency condition, switching loss can be greatly reduced,and meanwhile, the switching loss of a low-voltage unit having low voltage stress is also reduced; and high-frequency work can obviously reduce volume weight of a filtering device, and thus power density is improved.

Description

technical field [0001] The invention relates to a control system and method for a hybrid cascaded H-bridge rectifier with an output voltage of 1:2, and belongs to the technical field of control in electric energy conversion devices. Background technique [0002] In multi-electric aircraft, the frequency conversion AC power supply system is a developing trend. The output frequency of the generator is 360-800Hz. Some electrical equipment cannot withstand the wide range of power frequency changes. It needs to be converted into direct current (270V / 28V) or constant frequency alternating current (115V / 400Hz) through the secondary power supply system. To be used by airborne equipment. These power supply systems use autotransformer rectifiers or transformer rectifiers to achieve AC / DC conversion, and the inverter link uses a traditional bridge structure. [0003] However, ATRU has problems such as heavy weight, uncontrollable output voltage, poor three-phase unbalanced input char...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/219H02M1/14
CPCH02M1/14H02M7/219
Inventor 陈杰戴文婧陈新龚春英
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com