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High-step-up-ratio DC/DC converter based on improved SEPIC circuit

A high boost ratio, converter technology, applied in the direction of adjusting electrical variables, high-efficiency power electronic conversion, output power conversion devices, etc., can solve the problems of low system efficiency and large voltage stress of switching tubes.

Inactive Publication Date: 2019-07-12
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problems of large switch tube voltage stress and low system efficiency caused by the switch tube working in the hard switch state of the existing high-frequency step-up DC / DC converter, the present invention proposes a high boost ratio DC converter based on an improved SEPIC circuit. / DC converter

Method used

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  • High-step-up-ratio DC/DC converter based on improved SEPIC circuit

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Embodiment

[0045] Embodiment: combine below Figure 1 to Figure 13 This embodiment will be described in detail.

[0046] The high step-up ratio DC / DC converter based on the improved SEPIC circuit described in this embodiment includes a SEPIC circuit, and an additional switching tube S 2 , Diode D a1 , Diode D a2 , capacitance C s2 , capacitance C Q1 , capacitance C Q2 , capacitance C a and transformers;

[0047] The SEPIC circuit includes the switching tube S 1 , inductance L 1 , inductance L 2 , capacitance C s1 , Diode D o and capacitance C o ;

[0048] The transformer includes the primary inductance L 3p and the secondary inductance L 3s ;

[0049] Inductance L 1 The first terminal of the DC power supply V in The anode and switch tube S 2 The current inflow terminal is connected;

[0050] Inductance L 1 The second terminal is simultaneously connected with the capacitor C s1 The first end of the switch tube S 1 The current flows into the terminal and the diode D ...

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Abstract

The invention relates to a high-step-up-ratio DC / DC converter based on an improved SEPIC circuit and belongs to the technical field of power electronics to solve the problem that a current high-frequency step-up DC / DC converter causes large switching transistor voltage stress and low system efficiency because the switching transistor operates in a hard switching state. The high-step-up-ratio DC / DCconverter based on the improved SEPIC circuit is additionally provided with a switching transistor S2, a diode Da1, a diode Da2, a capacitor Cs2, a capacitor CQ1, a capacitor CQ2, and a capacitor Caand a transformer on the basis of a traditional SEPIC circuit. Due to the introduction of two parallel resonant capacitors, namely the capacitor CQ1 and the capacitor CQ2, both the switching transistors are turned on at zero voltage, which not only reduces the voltage stress at both ends of each switching transistor, but also reduces the loss of the switching transistors and improves system efficiency. The high-step-up-ratio DC / DC converter based on an improved SEPIC circuit is suitable for high-frequency applications.

Description

technical field [0001] The invention relates to a DC / DC converter and belongs to the technical field of power electronics. Background technique [0002] In recent years, with the increasingly prominent energy and environmental issues, new clean energy sources such as photovoltaic power generation have developed rapidly. At the same time, the step-up DC / DC converter, as an interface device between photovoltaic panels and inverters, has also been greatly developed. Existing step-up DC / DC converters require high efficiency on the one hand to fully utilize the energy generated by photovoltaic panels, and on the other hand require reduced volume and improved system power density. How to realize a step-up DC / DC converter with high efficiency and high power density has become an urgent problem in the field of direct current transmission. [0003] The existing step-up DC / DC converters mainly have the following problems: [0004] 1. For high-frequency step-up DC / DC converters, inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/33507H02M1/0054Y02B70/10
Inventor 王懿杰高珊珊陈恒管乐诗张相军徐殿国
Owner HARBIN INST OF TECH
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