A DC-DC Converter Topology Construction Method Based on Node Separation and Cell Embedding

Abstract

The invention discloses a DC-DC converter topology construction method based on node separation and unit embedding, comprising the steps of: 1) Finding out the instantaneous peak when the working state occurs in the switched capacitor DC-DC converter in which the instantaneous peak current appears Loops with large currents; 2) Divide the branches in the loops with instantaneous peak currents into private branches and public branches, and divide the nodes in the loops with instantaneous peak currents into detachable nodes and inseparable nodes node; 3) Select the corresponding type of switching inductance unit with source according to the actual application, and based on the embedding method of node separation, after one or more unit embeddings, there is one and only one in each loop with instantaneous peak current Including the source switching inductance unit, a new DC-DC converter topology without instantaneous peak current is finally obtained. The invention can solve the problem of instantaneous high peak current in the switched capacitor DC-DC converter, and improve the output voltage gain of the switched capacitor DC-DC converter.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a DC-DC converter topology construction method based on node separation and unit embedding. Background technique [0002] It is well known in the industry that the switched capacitor DC-DC converter uses a switched capacitor unit network in the main network between the input source and the output terminal, which has the unique properties of both step-up and step-down, and because of its low duty cycle Compared with the boost converter, it has a higher voltage gain, making it widely used in fuel cell power generation and photovoltaic power generation. When the traditional switched capacitor DC-DC converter is in the working state, there is a large instantaneous peak current in the switched capacitor unit. The dual principle is not suitable for this type of switched capacitor DC-DC converter, and the components of the switched capacitor DC-DC converter are subjected to l...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art, and propose a DC-DC converter topology construction method based on node separation and unit embedding to solve the problem of instantaneous peak current in switched capacitor DC-DC converters , improve the output voltage gain of the switched capacitor DC-DC converter, and according to different application scenarios, the switching inductance unit containing the source can be embedded in different positions to obtain a new topology to meet the actual application requirements

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