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

Quasi Z-source inverter of active switched capacitor

An active switch and capacitor technology, applied in electrical components, conversion devices for converting AC power input to DC power output, output power, etc. , The effect of improving power density and low duty cycle

Inactive Publication Date: 2017-09-05
SOUTH CHINA UNIV OF TECH
View PDF4 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cascading of multi-level quasi-Z sources increases the number of passive components such as inductors and capacitors, which greatly increases the volume, weight and cost of the circuit, which limits the use of the circuit in terms of system volume, weight and cost. application of low power consumption circuits

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
  • Quasi Z-source inverter of active switched capacitor
  • Quasi Z-source inverter of active switched capacitor
  • Quasi Z-source inverter of active switched capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] The present invention will be further described below in conjunction with specific examples.

[0017] see figure 1 As shown, the active switched capacitor quasi-Z source inverter provided in this embodiment includes a voltage source V i , Quasi-Z source unit, active switched capacitor unit, single-phase inverter bridge, output filter inductor, output filter capacitor and load R. The quasi-Z source unit consists of a first inductor L 1 , the second inductance L 2 , the first capacitance C 1 , the first diode D 1 , the second diode D 2 Composition; the active switched capacitor unit is composed of a MOS transistor S and a second capacitor C 2 , the third diode D 3 , the fourth diode D 4 constitute. The voltage source V i The positive pole of the first inductor L 1 One end of the connection; the first inductance L 1 The other end of the first diode D 1 anode of the second diode D 2 the anode connection; the first diode D 1 The cathodes are respectively conne...

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 quasi Z-source inverter of an active switched capacitor. The quasi Z-source inverter of the active switched capacitor comprises a voltage source, a quasi Z-source unit, an active switched capacitor unit, a single-phase bridge inverter, an output filtering inductor, an output filtering capacitor and a load, wherein the quasi Z-source unit is composed of a first inductor, a second inductor, a first capacitor, a first diode and a second diode, and the active switched capacitor unit is composed of an MOS tube S, a second capacitor, a third diode and a fourth diode. According to the quasi Z-source inverter of the active switched capacitor, the high-gain property of the quasi Z-source and the property of charging in parallel and discharging in series of the active switched capacitor are combined; compared with traditional Z-source inverters, the number of inductors and capacitors used is the same, but the voltage gain is obviously improved; compared with an enhanced boost quasi Z-source inverter with a switched impedance network, the voltage gains are the same, but the number of inductors and capacitors decreases by two respectively, so that the number of passive components is greatly reduced, a higher output voltage gain is achieved with a lower duty ratio, and the power density of the system is improved.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to an active switched capacitor quasi-Z source inverter. Background technique [0002] The Z-source inverter connects an X-shaped LC impedance network between the input source and the inverter bridge, which has the unique properties of step-up and step-down, and because of its lower duty cycle than the boost converter With higher voltage gain, it is widely used in fuel cell power generation and photovoltaic power generation. The traditional Z-source inverter has defects such as discontinuous power supply current and input and output non-common ground. The quasi-Z-source inverter proposed in recent years has solved these two problems well, and through the multi-level quasi-Z source impedance The cascading of networks can achieve quite high voltage gains. However, the cascading of multi-level quasi-Z sources increases the number of passive components such as inductors and ...

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): H02M7/5387
CPCH02M7/53871
Inventor 陈艳峰古远威张波丘东元
Owner SOUTH CHINA UNIV OF TECH
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