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Cascading multiple electrical level double decompression semi-bridge converter

A half-bridge inverter, multi-level technology, used in electrical components, conversion devices for converting AC power input to DC power output, and output power, etc. The problem of increasing the proportion of recovery loss to achieve the effect of reducing switching loss, low stress, and reducing the size of the filter

Inactive Publication Date: 2010-05-12
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For MOS devices, measures to improve MOSFET performance often lead to poor body diode performance, and it is difficult to optimize both
At the same time, studies have shown that with the increase of the switching frequency, the reverse recovery problem of the body diode of the switching device tends to be serious, and the proportion of the reverse recovery loss in the total loss of the converter increases significantly.

Method used

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  • Cascading multiple electrical level double decompression semi-bridge converter
  • Cascading multiple electrical level double decompression semi-bridge converter
  • Cascading multiple electrical level double decompression semi-bridge converter

Examples

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Embodiment Construction

[0017] Such as figure 1 As shown, the cascaded multi-level double-buck half-bridge inverter of this embodiment includes a first voltage drop circuit 2 and a second voltage drop circuit 3, wherein the first voltage drop circuit 2 includes a first power switch The tube S1, the first power diode D1 and the first inductor L1, the first power switch tube S1, and the first power diode D1 are connected in series, the cathode of the first power switch tube S1 is connected to the cathode of the first power diode D1, and the first inductor One end of L1 is connected to the cathode of the first power switch tube S1; the second step-down circuit 3 includes the second power switch tube S2, the second power diode D2 and the second inductor L2, the second power switch tube S2, the second power diode D2 is connected in series, the anode of the second power switch tube S2 is connected to the anode of the second power diode D2, one end of the second inductor L2 is connected to the anode of the ...

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Abstract

This invention provides one linkage level double lowering semi-bridge inverter, which comprises the following parts: first and second lowering circuit and second power circuit and work switch circuit,wherein, the second power circuit comprises series third power and fourth power; the work switch circuit comprises third power switch and fourth power switch with third power tube encode connected tothat of third power; the fourth power switch tube encode is connected to fourth power switch.

Description

1. Technical field [0001] The invention relates to a half-bridge inverter, in particular to a cascaded multilevel half-bridge inverter. 2. Background technology [0002] In recent years, the application of multi-level inverters in high-voltage and high-power applications has received widespread attention. At the same time, the use of multi-level technology is very beneficial to reduce the volume and weight of the filter components that account for a large part of the inverter. The idea of ​​a multi-level converter was first proposed by Nable et al. in 1981. Its basic idea is to start from the circuit topology and synthesize a ladder wave from several levels to get close to the sinusoidal output voltage. Since the harmonic content of the output voltage is already very low before filtering, the volume and weight of the required filter components are greatly reduced. Because the switching device shares the input voltage and power, the stress of the switching device is small, s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/515
Inventor 洪峰单任仲王慧贞严仰光
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS