Wide Input DC Converter Topology and Its Feedforward Average Current Control Method

Abstract

The invention belongs to the technical field of power electronics application, and in particular relates to a wide-input DC converter topology and a feedforward average current control method thereof. Wide-input DC converter topologies include dual-transistor Buck-Boost converters and interleaved parallel dual-transistor Buck-Boost converters. The feedforward average current control method suitable for it is composed of an input voltage feedforward module, a mode switching module, a voltage outer loop and a current inner loop. This method introduces the input voltage feedforward into the current inner loop of the average current control, calculates the feedforward function of the input voltage feedforward to the current inner loop, and simplifies it to obtain the feedforward average current suitable for practical applications control, which greatly improves the input dynamic response performance of the converter in the entire input voltage range; the interleaved parallel technology not only increases the conversion capacity, but also effectively reduces the output current ripple, providing a wide range of input and high power conversion fields. support.

Description

technical field [0001] The invention belongs to the technical field of power electronics application, and in particular relates to a wide-input DC converter topology and a feedforward average current control method thereof. Background technique [0002] With the continuous development of semiconductor technology, the power that semiconductor devices can withstand is increasing, and the DC converter composed of it plays an increasingly important role in the field of power supply. It has been widely used in solar power generation, tidal power generation, fuel cell and other new energy power generation fields, but the output voltage of these new energy power generation systems will fluctuate greatly due to changes in ambient temperature, climate and other conditions, often too low or too high, thereby exceeding the specified input voltage range. In order to protect the subsequent equipment from damage, the entire system cannot be made to work in the maximum power generation mo...

AI Technical Summary

Problems solved by technology

However, this kind of converter has a large range of input voltage changes, which will cause a large impact on the output voltage when the operating mode is switched, which will affect the normal operation of the subsequent equipment and the converter itself, and may cause conversion. The generator itself and the post-stage equipment are burned, which paralyzes the entire power generation system, and its achievable conversion power is relatively small.

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