A zero-ripple high-gain dc-dc converter based on a novel boost unit

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...

AI Technical Summary

Problems solved by technology

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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