A series multi-input coupled inductor buck-boost converter

Abstract

The invention discloses a series type multi input coupled inductor buck and boost converter which belongs to the technical field of power electronic converters. The converter is composed of N boost circuits, a buck circuit (20) and a load, wherein N is a natural number more than one. Each boost circuit is composed of an input source, a filtering inductor, a switch tube, a diode and a filtering capacitor. The buck circuit is composed of a switch tube, a diode, a filtering inductor and a filtering capacitor. The output ends of N boost circuits are connected in series and then are connected with the input end of the buck circuit (20). The output end of the buck circuit (20) is connected with the load. The filtering inductors of N boost circuits are respectively coupled with the filtering inductor of the buck circuit. According to the converter provided by the invention, a number of input sources power the load at the same time; buck and boost conversion between input and output is realized; the filtering inductors are coupled with each other; the converter has the advantage of small size; different input sources and the load side can be respectively and independently controlled; and the control is simple.

Description

technical field [0001] The invention relates to a series multi-input coupled inductance buck-boost converter, which belongs to the technical field of power electronic converters. Background technique [0002] The energy crisis and environmental pollution are becoming more and more serious, and the development and utilization of new energy sources are valued by countries all over the world. The output voltage of new energy power generation equipment such as thermal energy temperature difference battery, photovoltaic battery and fuel cell changes in a wide range with the change of environmental conditions, while the terminal voltage of energy storage equipment such as battery and supercapacitor varies with the state of charge and discharge. It is also converted in a wide range, and the output voltage of a single new energy power generation device is very low, so a DC converter that can adapt to a wide voltage range and achieve high boost is required. On the other hand, the ou...

AI Technical Summary

Problems solved by technology

Literature "Ren Xiaoyong, Tang Zhao, Ruan Xinbo, etc. A novel four-switch Buck-Boost converter [J]. Chinese Journal of Electrical Engineering, 2008, 28(21): 15-19." The Buck converter studied A buck-boost converter cascaded with a Boost converter includes only one inductor and has a simple topology, but the current at the input and output terminals is intermittent, so it is not suitable for ripple-sensitive applications such as thermal energy thermoelectric power generation and fuel cells; Literature" Rae-YoungKimandJih-ShengLai.Aseamlessmodetransfermaximumpowerpointtrackingcontrollerforthermoelectricgeneratorapplications[J].IEEETransactionsonpowerelectronics, 2008, 24(5): 2310-2318."The input and output current of the buck-boost converter studied is continuous, but it contains two independent inductors. Big

At the same time, the above-mentioned buck-boost converter can only realize power conversion from a single input source to a load, and cannot simultaneously realize power conversion between multiple input sources and loads

On the other hand, the traditional Boost converter is used in the buck-boost converter, and its boost ratio is limited by the maximum duty cycle, voltage and current stress of the switch tube in the converter, so it is not suitable for applications requiring a high boost ratio

However, in the occasions requiring a high boost voltage, the boost voltage is usually achieved by means of a transformer, and the converter structure is complex and the conversion efficiency is low.

Images