A zero-ripple high-gain dc-dc converter based on a novel boost unit
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A technology of DC-DC and converters, which is applied in the field of large ratio DC-DC unidirectional power conversion, and can solve the problems of limited boost gain characteristics of Boost converters, affecting the service life of power supplies, and large current stress of switching devices. , to achieve the effects of improving time response characteristics, easy control of current ripple, and reducing voltage stress
Active Publication Date: 2021-11-02
FUZHOU UNIV
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However, when a high boost ratio is required, the switching tube must work in the limit duty cycle state, and will bear a large voltage and current stress, resulting in a decrease in system efficiency. In addition, due to the influence of circuit parasitic parameters, in practice When applied, the boost gain characteristics of the Boost converter are limited
In addition, excessive input current ripple will generate corresponding electromagnetic interference (EMI) to the front-end converter or power supply, resulting in problems such as low converter efficiency and high current stress of switching devices, which will affect the service life of the power supply
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[0020] The invention will be further described below with reference to the accompanying drawings and examples.
[0021] It should be noted that the following detailed description is illustrative and is intended to provide a further description of the present application. All techniques and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art of the present application.
[0022] It should be noted that the terms used herein are intended to describe specific embodiments, and not intended to limit the exemplary embodiments of the present application. As used herein, unless the context further explicitly indicates that the singular form is intended to include multiple forms, but it should be understood that when the term "including" and / or "includes" in this specification, it indicates There is a combination of features, steps, operations, devices, components, and / or their combinations.
[0023] like figure 1 As shown, thi...
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Abstract
The invention relates to a zero-ripple high-gain DC-DC converter based on a novel boost unit, including a low-voltage DC power supply V in , power switch tube S, first power diode D 1 , the second power diode D 2 , the third power diode D 3 , the fourth power diode D S1 , the first coupled inductance L 1 , the second coupled inductance L 2 , the first capacitor C 1 , the second capacitor C 2 , output resistance R o and a DC-DC conversion module; the DC-DC conversion module includes a group of new boost units, i=1,...,N, and each group of new boost units includes an independent inductor L i0 , power diode D i0 ,capacitance C i1 and capacitance C i2 The converter of the present invention not only has the characteristics of zero input current ripple, low voltage stress of power devices, simple control circuit, etc., but also can achieve higher voltage output by expanding a specific number of boost units. In addition, in the case of the same output voltage, the more the number of extended boost units, the lower the voltage stress of the power device.
Description
Technical field [0001] The present invention relates to a large variable than DC-DC one-way power conversion field, particularly a zero-line wave high gain DC-DC converter based on a new type of boost unit. Background technique [0002] A large number of petrochemical fuels lead to global environmental pollution and energy exhaustion. Renewable energy technologies such as photovoltaic, wind turbines, fuel cells, etc.) can effectively solve the above problems. Due to the need for the AC grid, the bus voltage of the DC micro-network bus line is generally up to 350V-400V, and the voltage generated by a variety of sub-source represented by photovoltaic and fuel cells is lower, typically 30V to 50V. Although a large amount of photovoltaic battery board can achieve the requirements of the grid-connected inverter to the input voltage level, this will cause a series of problems such as system efficiency and reliability, high cost, excessive system, and there is A unit failure makes the e...
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