A secondary type multi-voltage unit dc-dc converter for photovoltaic system

A DC-DC and photovoltaic system technology, applied in photovoltaic power generation, control/regulation systems, DC power input conversion to DC power output, etc., can solve problems such as unrealizable, high voltage gain, low efficiency, etc., to improve efficiency, The effect of increasing the boosting capability and increasing the voltage gain

Active Publication Date: 2020-06-30
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, due to the limitation of parasitic parameters, very high voltage gain cannot be achieved
If a cascaded topology is used, the problem of low efficiency caused by the increase in the number of devices will be highlighted again.

Method used

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  • A secondary type multi-voltage unit dc-dc converter for photovoltaic system
  • A secondary type multi-voltage unit dc-dc converter for photovoltaic system
  • A secondary type multi-voltage unit dc-dc converter for photovoltaic system

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Embodiment Construction

[0025] The technical solution of the present invention will be further introduced below in combination with specific embodiments.

[0026] The first specific embodiment of the present invention discloses a secondary type multi-voltage unit DC-DC converter for photovoltaic systems, such as figure 1 shown, including the input supply V in , input supply V in The positive connection of the inductance L 1 at one end, the inductance L 1 The other ends are connected to the freewheeling diode D 1 anode and freewheeling diode D 2 anode of the freewheeling diode D 1 The cathodes of the coupled inductors are respectively connected to the primary winding L of the coupled inductor 2 One end of the capacitor C 1 One end of the freewheeling diode D 5 The anode of the coupled inductor primary winding L 2 Connect the other end of the capacitor C 4 One end of the freewheeling diode D 2 The cathode and the drain of the switching tube S, the capacitor C 4 The other ends are connected ...

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Abstract

The invention discloses a secondary type multi-voltage unit DC-DC converter for a photovoltaic system, which incorporates a boost unit structure of a multi-voltage unit, and compared with a traditional boost converter, the boost performance is improved; Compared with the boost unit of the traditional voltage doubler unit structure, the converter has superior boost voltage performance as the duty cycle increases. The present invention also incorporates the structure of the secondary boost circuit, the voltage gain is further improved, and at the same time, the number of switch tubes S is not increased, the difficulty of system control is not increased, and the switch tube S and the output rectifier diode D o electrical stress is not affected. In addition, the present invention also incorporates the leakage inductance clamping circuit structure, on the basis of using the coupling inductance to improve the boosting capability of the converter, the energy of the leakage inductance of the coupling inductance can be released, and the circuit resonance problem caused by the energy of the leakage inductance is avoided , and also improves the efficiency of the circuit.

Description

technical field [0001] The invention relates to a DC-DC converter, in particular to a secondary type multi-voltage unit DC-DC converter for a photovoltaic system. Background technique [0002] With the depletion of traditional fossil energy and the deteriorating environment of human beings, the development of clean renewable energy is imminent. All countries in the world are committed to the research and development of new energy applications, of which solar energy and wind energy have been obtained a wider range of applications. However, for these systems, how to operate grid-connected and meet the high voltage requirements in the grid is still the most important issue. At present, a large number of boost converters have been developed to meet these applications. Among different converters, the traditional BOOST converter can theoretically increase the voltage gain by increasing the duty cycle. However, in practical applications, due to the limitation of parasitic paramet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/155
CPCH02M3/155H02M3/1552Y02E10/56
Inventor 林明耀艾建刘同民陈云琦
Owner SOUTHEAST UNIV
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