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Double step-down combining inverter

An inverter, double step-down technology, applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc. Achieve the effect of optimizing design, improving the quality of the incoming current waveform, and improving reliability

Inactive Publication Date: 2009-03-18
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the full-bridge inverter has the problem of through-through of the power switch tube of the bridge arm, which reduces the reliability of the system.

Method used

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  • Double step-down combining inverter

Examples

Experimental program
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Embodiment Construction

[0013] like figure 1 shown. A double step-down grid-connected inverter, including grid u grid , Power U in , the first filter inductance L 1 , the first power switch tube S 1 , the first freewheeling diode D 1 , the second filter inductance L 2 , the second power switch tube S 2 , the second freewheeling diode D 2 , the third filter inductance L 3 , the third power switch tube S 3 , the fourth filter inductor L 4 and the fourth power switch S 4 , where power U in The anode of the fourth power switch tube S 4 Drain of the second freewheeling diode D 2 The cathode of the third power switch tube S 3 drain and the first freewheeling diode D 1 The cathode connection of the fourth power switch tube S 4 The source of the fourth filter inductor L 4 The output terminal, the fourth filter inductor L 4 The input terminals of the grid u grid The output terminal of the second filter inductor L 2 The input terminal is connected to ground, the second filter inductor L 2 ...

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Abstract

The invention discloses a double-decompression grid-connected inverter which belongs to inverters. The double-decompression grid-connected inverter comprises a power network, a power supply, a first filter inductance, a first power switch tube, a first fly-wheel diode, a second filter inductance, a second power switch tube, a second fly-wheel diode, a third filter inductance, a third power switch tube, a fourth filter inductance and a fourth power switch tube. The double-decompression grid-connected inverter improves the reliability of the system, the fly-wheel diode can be designed to the optimum, each power switch tube does not need to set the dead zone time, the grid current waveform quality is improved, and compared with a double-decompression type half-bridge inverter, the availability ratio of input direct current bus voltage can be improved.

Description

technical field [0001] The invention relates to an inverter, in particular to a double step-down grid-connected inverter. Background technique [0002] With the continuous shortage of fossil energy and the aggravation of environmental pollution, the distributed power generation system based on new energy and renewable energy has become a hot research topic today, and the grid-connected inverter is an important part of it. At the same time, in order to ensure the normal operation of the power grid, higher requirements are put forward for the reliability of the grid-connected inverter. The double step-down half-bridge inverter improves the reliability of the system because there is no direct problem of the bridge arm power switch tube of the traditional bridge inverter. However, there is a disadvantage of low utilization of the input DC voltage, that is, the maximum output voltage of the bridge arm is only half of the input DC voltage. When the output voltage is 220VAC and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/537H02M7/5387
Inventor 姚志垒王勤肖岚严仰光
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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