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Wide-voltage-range input type non-isolated double-switch wide-gain boost direct-current converter

A technology of DC converter and double switch, which is applied in the direction of converting DC power input to DC power output, adjusting electrical variables, and output power conversion devices, and can solve problems such as narrow boosting range and weak boosting capacity

Active Publication Date: 2020-05-19
TIANJIN UNIV MARINE TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the technical problems existing in the prior art, the wide-voltage range input type non-isolated double-switch wide-gain step-up DC converter of the present invention is suitable for low-voltage level power generation units and solves the problem of weak boosting capability of the current non-isolated step-up DC converter , the problem of narrow boost range

Method used

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  • Wide-voltage-range input type non-isolated double-switch wide-gain boost direct-current converter
  • Wide-voltage-range input type non-isolated double-switch wide-gain boost direct-current converter
  • Wide-voltage-range input type non-isolated double-switch wide-gain boost direct-current converter

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Embodiment 1

[0019] 1) Topology

[0020] Such as figure 1 Shown is the topology of the proposed converter of the present invention. The input side of the converter is used V in Indicates a DC generating unit with a low voltage level, with a resistive load on the output side R Indicates the load on the DC bus side, used for the DC bus voltage V o express. The input side and the output side are connected by the proposed dual-switch wide-gain DC boost unit, which consists of two inductors L 1 , L 2 , four capacitors C 1 ~ C 4 , 6 power devices Q 1 , Q 2 、D 1 ~D 4 pose, Q 1 and Q 2 The drive signal is used respectively S 1 and S 2 express.

[0021] 2) Wide voltage gain

[0022] The converter proposed in this patent contains two power switches and requires two drive signals S 1 , S 2 , in theory S 1 S 2 There are four combinations, namely "11, 10, 00, 01" ("1" means the switch is on, and "0" means the switch is off). However, since the proposed converter uses t...

Embodiment 2

[0048] Below to figure 1 The novel wide-gain quasi-Z source switched capacitor boost DC converter topology shown, figure 2 , 3 The topological equivalent circuit diagram of and Figure 4 The important working waveforms when the new topology is running stably, and the principle of the solution in the first embodiment will be described. In one carrier cycle, the converter experiences two switching states. The two switch states are described below respectively.

[0049] (1) S 1 S 2 =11, the equivalent circuit of this state is as figure 2 shown. according to Figure 4 The topological working waveform, in this working mode, the power switch tube Q 1 , Q 2 conduction, the diode D 1 、D 2 、D 4 off, D 3 conduction. V in by Q 1 To inductance L 1 charge; capacitor C 1 and C 2 by Q 1 , Q 2 Series to inductor L 2 charge; capacitor C 2 by Q 1 , Q 2 and D 3 Give C 3 charge; capacitor C 4 give load R powered by.

[0050] (2) S 1 S 2 =00, the equiv...

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Abstract

A wide-voltage-range input type non-isolated double-switch wide-gain boost DC converter has the advantages of the wide voltage gain, low voltage stress of a power switch and a capacitor, self-balanceof capacitor voltage and the like. The voltage stress of the power switch is lower than the output voltage, and the capacitor voltage is lower than half of the output voltage. The wide-voltage-range input type non-isolated double-switch wide-gain boost DC converter is more suitable for the application occasion of the one-way boost DC converter with wide voltage gain.

Description

technical field [0001] The invention belongs to the technical field of power electronic power conversion, and in particular relates to a wide-voltage-range input type non-isolated double-switch wide-gain step-up DC converter. Background technique [0002] The massive exploitation and utilization of fossil fuels has caused a series of energy and environmental problems, and human beings urgently need to develop renewable and clean energy to alleviate energy problems and improve the ecological environment. In recent years, with the research and application of photovoltaic, fuel cell power generation systems and other clean energy power generation systems around the world, the shortage of fossil fuels has been effectively alleviated to a certain extent, and air quality has been improved. However, the voltage at the output terminal of power generation units such as photovoltaics and fuel cells is generally only tens of volts, and it is easy to change with the change of the load. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158
CPCH02M3/1584
Inventor 王萍傅传智杨瑞福谢思宇
Owner TIANJIN UNIV MARINE TECH RES INST
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