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Single-tube quasi-Z-source Boost converter

A converter, single-tube technology, applied in the direction of converting DC power input to DC power output, instruments, adjusting electrical variables, etc., can solve problems such as limiting the efficiency of secondary boost converters, achieve low voltage stress, reduce difficulty, The effect of high system efficiency

Active Publication Date: 2019-12-31
NANTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it uses three diodes, and the voltage stress of the capacitor is the same as that of the original cascaded system, which is much higher than the input voltage; in addition, the switch tube and the boost diode on the output side bear higher voltage stress (equal to the output voltage ), which limit the further improvement of the efficiency of the quadratic Boost converter

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Embodiment Construction

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

[0026] Please refer to figure 2 , figure 2 The schematic diagram of the circuit structure of the single-tube quasi-Z source Boost converter provided by the embodiment of the present invention (in the figure, an N-channel MOS transistor is used as the switch tube, and the capacitors are polarized capacitors). The single-tube quasi-Z source Boost converter includes a DC voltage source U in , the first inductance L 1 , the second inductance ...

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Abstract

The invention discloses a single-tube quasi-Z-source Boost converter. The converter comprises a direct voltage source, a switch module, a first diode, a second diode, a first inductor, a second inductor, a first capacitor, a second capacitor, a third capacitor and a load. A voltage gain G of the single-tube quasi-Z-source Boost converter equals to (1 + D) / (1-D), and a high gain can be achieved ata low duty ratio. Voltage stresses of the switch module, the first diode and the second diode are (Uin + Uo) / 2, the voltage stresses of the first capacitor and the third capacitor are (Uo-Uin) / 2, andthe voltage stress of the second capacitor is Uo. Compared with a traditional secondary Boost converter, by using the single-tube quasi-Z-source Boost converter of the invention, under a same workingcondition, the voltage stresses of the switch module and a part of the diodes are reduced to a certain extent, and one diode is omitted so that system losses are reduced, device type selection difficulty and cost are decreased, and conversion efficiency is improved.

Description

technical field [0001] The present application relates to the field of electrical technology, in particular to a single-tube quasi-Z source Boost converter. Background technique [0002] In order to alleviate problems such as energy crisis and environmental pollution, distributed new energy grid-connected power generation technologies such as photovoltaics, wind power, and fuel cell power generation have developed rapidly. The output voltage of battery units such as photovoltaic cell modules, fuel cells, and storage batteries is low and varies in a wide range, generally 30-48V, while the input voltage required by the half-bridge / full-bridge voltage source type grid-connected inverter is usually 380 / Above 760V. In order to meet the input voltage requirements of the inverter, it is usually necessary to connect multiple battery cells in series. However, the series system can easily fail to work properly due to the failure of one of the units; moreover, in order to meet the i...

Claims

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Application Information

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IPC IPC(8): H02M3/155
CPCH02M3/155
Inventor 秦岭张宇妍田民
Owner NANTONG UNIVERSITY