Capacitance clamping-based three-phase interleaving ultrahigh-gain boost converter

Abstract

The invention discloses a capacitance clamping-based three-phase interleaving ultrahigh-gain boost converter. The capacitance clamping-based three-phase interleaving ultrahigh-gain boost converter comprises a load, a positive capacitance clamping circuit, a reverse capacitance clamping circuit and a three-phase interleaving Boost structure, wherein positive capacitance clamping circuit comprises afirst capacitor, a second capacitor, a first diode and a second diode, the reverse capacitance clamping circuit comprises a third capacitor, a fourth capacitor, a third diode and a fourth diode, thethree-phase interleaving Boost structure comprises a first inductor, a second inductor, a third inductor, a first switch tube, a second switch tube, a third switch tube and an input source, the three-phase interleaving Boost structure is connected with the positive capacitance clamping circuit by a first node and a second node and is connected with the reverse capacitance clamping circuit by the second node and a third node, and the load is connected with the positive capacitance clamping circuit and the negative capacitance clamping circuit by a sixth node and a seventh node. The converter has the characteristics of ultrahigh voltage gain, ultralow input current ripple and low voltage stress and is applicable to the field of grid-connected power generation of a fuel cell and a photovoltaic cell.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a three-phase interleaved parallel ultra-high gain boost converter based on capacitance clamping. Background technique [0002] Due to the increasing environmental pollution and the depletion of petroleum resources, clean and pollution-free renewable energy power generation technologies are favored, such as fuel cells and photovoltaic cells. However, there are two problems in the power generation technology of fuel cells and photovoltaic cells. One is that the output voltage of fuel cells and photovoltaic cells is relatively low, generally only 20-50V, while the DC bus voltage of the grid-connected inverter is 400V / 750V. The high-gain converter converts 20-50V into a DC voltage of 400V / 750V; the second is that fuel cells and photovoltaic cells are more sensitive to current ripples, and larger current ripples will reduce the life of fuel cells and photovoltaic cells. Th...

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Problems solved by technology

For switched capacitor high-gain converters, it can achieve higher voltage gain, but it will cause higher current peaks due to capacitor charging and discharging during switching, which will affect the efficiency and reliability of the converter; Due to the parallel charging and series discharging of the input side inductors of the high-gain converter, the current ripple on the input side is relatively large, which affects the life of the battery

[0004] For problem 2, currently the interleaved parallel structure is mainly used to reduce the current ripple on the input side, but generally the voltage gain is relatively low

For example, one of the most basic two-phase interleaved parallel Boost converters in related technology is formed by interleaving and paralleling two traditional Boost converters, which can reduce the input current ripple of the converter, but does not increase the voltage gain of the converter

In order to increase the voltage gain of the converter, another related technology proposes a two-phase interleaved parallel boost converter, which adds a voltage doubler module on the basis of the traditional two-phase interleaved parallel Boost converter to double the output voltage, but the structure More complicated, the voltage doubler module includes two capacitors and two diodes, and the voltage gain is only doubled

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