Abstract
This paper presents a partial power processing and an efficiency analysis of dc-dc differential converters based on the use of two basic converters of the same group: the positive or negative group. The paper contributes theoretical analysis and demonstrates that the differential converters based on the positive group process has more power than the load requires, and that the differential converters based on the negative group process has less power than the load needs. This is an important advantage of the negative group converters, since a parcel of the output power is directly transferred by the input source to the load, resulting in partial power processing. In order to verify the theoretical analysis herein developed, ten prototypes are evaluated considering an input voltage of 20 V and output power of 100 W.
Highlights
Environmental concerns and the search for the diversification of energy matrixes make renewable sources a real alternative for electrical energy production around the world [1,2]
In [20] the differential connections are derived from two basic converters of different groups, so that the differential voltage is the sum of the output voltages of each of the basic converters, as shown in Figure 1, where a boost converter (positive group—Converter (1) is connected with a buck-boost converter (negative group—Converter (2)
On analyzing (2) and (3), it is possible to verify that the input source (Vin) contributes with the differential voltage applied to the load, respectively decreasing and increasing it
Summary
Environmental concerns and the search for the diversification of energy matrixes make renewable sources a real alternative for electrical energy production around the world [1,2]. Non-isolated topologies based on the differential connections between basic converters were introduced by [19,20,21] This kind of connection is composed of two stages and it provides higher voltage gain with a lower duty cycle value, which can improve efficiency when compared to a one-stage converter. Whereas the authors of [19] derived the differential converters from two basic converters of the same group, the authors of [20] proposed the connection between converters of different groups Both works approached these connections to provide high-gain step-up dc-dc converters, presenting several possible combinations of converters, detailing the modulations and control strategies, and deriving the static gain equations. This paper contributes with the detailing of how the power is distributed inside differential converters, in order to demonstrate their ability to provide partial power processing and to show how the total efficiency is impacted
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