Modular high-boost isolated DC-DC converter with adjustable number of input phases

Abstract

The invention discloses a modular high-boost isolated DC-DC converter with an adjustable number of input phases. Compared with a conventional scheme, the number of input phases can be adjusted freely,and all input phases can achieve the automatic sharing of a current, and the control strategy of the converter is enabled to be simple. A first module of the converter consists of an inductor, a mainpower switch, a drain-source parasitic capacitor of the main power switch, a clamping auxiliary switch, a clamping capacitor, a transformer, a leakage inductor of the transformer, n-1 capacitors, anda diode. Each of other modules consists of one inductor, one main power switch, a drain-source parasitic capacitor of the main power switch, a clamping auxiliary switch, a clamping capacitor, a transformer, a leakage inductor, n capacitors, and a diode. The converter can achieve the adjustment of the input / output gains and the voltage stress of a switching device of the converter through the adjustment of n, and can achieve the adjustment of the current stress of the switching device in the converter through the adjustment of the number of modules. In addition, the switching tube in the converter achieves the zero-voltage connection, and the diode achieves the zero-current disconnection. The converter is more suitable for a large-capacity high-gain boost conversion occasion which requireselectrical isolation.

Description

technical field [0001] The invention relates to an isolated DC-DC converter, in particular to a high-boost isolated DC / DC converter with adjustable input phases. Background technique [0002] In recent years, offshore wind power technology has developed rapidly, and its DC bus field usually requires a voltage gain of tens of times or even higher, and the processed power capacity is as high as several megawatts or even higher. Existing solutions are difficult to apply and require Converter with higher gain and capacity. [0003] In the prior art, the output voltage gain of the traditional step-up isolated converter is usually realized by enlarging the turns ratio of the primary and secondary windings of the transformer. , On the other hand, there is also the problem of high voltage and current stress of the switching device. There are mainly three types of converters currently being studied in response to the above problems: the first is the dual full-bridge DC / DC converter...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems faced by the existing large-capacity and high-gain isolated DC / DC converters, such as high device voltage and current stress, low input and output gains, and difficulties in parallel operation of multiple modules and current sharing

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