A kind of high step-up dc/dc converter

A converter and high-boost technology, applied in the field of high-boost DC/DC converters, can solve problems such as output capacitor voltage imbalance, high voltage stress, and high voltage gain, and achieve low device voltage stress and strong boost capability , the effect of low voltage stress

Active Publication Date: 2016-03-02
CHONGQING UNIV
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Problems solved by technology

[0004] In view of the above-mentioned shortcomings existing in the existing high-boost DC / DC converter, the purpose of the present invention is to solve the problems of high voltage stress, complex control, and unbalanced output capacitor voltage in the existing high-boost DC / DC converter, and provide A Novel High Boost DC / DC Converter with Low Device Voltage Stress, High Voltage Gain and High Efficiency

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Embodiment Construction

[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] see figure 1, the present invention designs a kind of high step-up DC / DC converter, is made up of Boost circuit unit and step-up unit, can realize soft switching, has very high efficiency, and Boost circuit unit and step-up unit realize the high step-up of the converter . Based on the idea and method of the present invention, different high-boost converters can be obtained by changing the topology combination of the boost units.

[0026] Figure 2-4 Three different boost unit converters with this similar structure are listed.

[0027] in, figure 2 The boost unit is a rectifier circuit, the specific connection structure is: capacitor C One end is connected to the switch tube S at the same time 2 The drain and coupled inductor secondary L 2 The end of the same name, the other end is connected to the cathode of the diode...

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Abstract

The invention provides a high voltage rise DC / DC converter. The high voltage rise DC / DC converter can convert a low voltage direct current into a high voltage direct current, can achieve soft switching, and has high work efficiency. The high pressure rise DC / DC converter comprises two portions which are respectively a boost circuit unit and a voltage rise unit. The boost circuit unit is composed of two power switches S1 and S2, and a primary side L 1 of a coupling inductor. A subsidiary side L 2 of the coupling inductor, a capacitor c and a diode D form the voltage rise unit of the high voltage rise DC / DC converter. The voltage rise unit is equivalent to a controllable direct current voltage source, and voltage of the voltage rise unit is related to turn ratios N of the subsidiary side and the primary side of the coupling inductor, and the duty ratio D of a switching tube S1. Compared with an existing high voltage rise DC / DC converter, the high voltage rise DC / DC converter is high in voltage gain, low in voltage stress of devices, and high in efficiency.

Description

technical field [0001] The invention relates to a high-boost DC / DC converter, which is used for converting low-voltage direct current into high-voltage direct current. It is mainly used in high-boost and high-efficiency occasions, and belongs to the technical field of high-boost DC / DC. Background technique [0002] High-gain DC / DC converters are widely used in various occasions, such as uninterruptible power supply, high-intensity discharge lamps, electric vehicles, fuel cell grid-connected power generation, photovoltaic grid-connected power generation and other systems. In the case of high boost voltage, the duty cycle of the traditional Boost converter will reach the limit, and the voltage and current stress is high, the conversion efficiency is low, and the actual voltage gain is limited by the equivalent series resistance. In order to achieve a high boost, the relevant literature has conducted research on high boost DC / DC converters. Cascaded Boost converters can increa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02M7/06H02M7/10
Inventor 罗全明张阳闫欢周雒维
Owner CHONGQING UNIV
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