High-gain boost converter based on coupling inductance and voltage transfer technology

Abstract

The invention discloses a high-gain boost converter based on a coupling inductance and voltage transfer technology. The high-gain boost converter comprises an asymmetric interleaving Boost circuit, a voltage transferring unit circuit, a voltage multiplying unit circuit and an output unit circuit, wherein the asymmetric interleaving Boost circuit, the voltage transferring unit circuit, the voltage multiplying unit circuit and the output unit circuit are sequentially connected with one another. The asymmetric interleaving Boost circuit comprises a first switching tube, a second switching tube, a first diode, a primary winding of a first coupling inductor and a primary winding of a second coupling inductor. The voltage transferring unit circuit comprises a first capacitor, a fourth capacitor and a second diode. The voltage multiplying unit circuit comprises an auxiliary winding of the first coupling inductor, an auxiliary winding of the second coupling inductor, a second capacitor and a third diode. The output unit circuit comprises a fourth diode, a third capacitor and a load. According to the high-gain boost converter based on the coupling inductance and voltage transfer technology, the switching losses produced when the converter works are reduced, and the improvement of the power level of the converter is facilitated.

Description

technical field [0001] The invention relates to the technical field of power electronic converters, in particular to a high-gain boost converter based on coupled inductance and voltage transfer technology. Background technique [0002] In a solar power generation system or a fuel cell system, since a single solar cell or a single fuel cell provides low-voltage direct current, and the voltage required in practical applications is usually high, it requires a high-efficiency, low-input The current ripple, high gain, and stable performance boost converter converts low-voltage DC to high-voltage DC suitable for practical needs. [0003] At present, the most commonly used boost converter is a single-tube Boost converter. However, the boost range of this converter is very limited. Usually, the boost multiple is within ten times, and it is difficult to meet the conversion requirements of high gain. Although the single-transistor high-gain converter realized by coupled inductor tech...

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Problems solved by technology

[0003] At present, the most commonly used boost converter is a single-tube Boost converter. However, the boost range of this converter is very limited. Usually, the boost multiple is within ten times, and it is difficult to meet the high-gain conversion requirements.

Although the single-transistor high-gain converter realized by using coupled inductor technology can increase the gain of the converter, the input current ripple is relatively large

Using interleaved parallel technology can reduce the input current ripple but can not achieve the expansion of the converter gain

In order to achieve gain expansion, switched capacitor technology can also be used. This technology has a simple circuit structure and is easy to implement, but it has the disadvantages of large switch current peak impact and limited voltage gain.

Although the voltage gain of the converter can be further expanded through the multi-stage switched capacitor structure, the circuit structure will become very complicated

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