High gain modular high capacity isolated DC/DC converter

Abstract

The invention discloses a high gain modular high capacity isolated DC / DC converter, the number of input phases of the provided converter can be modularly adjusted, the input currents of all modules can be automatically equalized, and thus the control strategy of the converter becomes simple. The first module of the provided converter is composed of an inductor, a power switch and drain and sourcespurious capacitors thereof, a transformer and a drain inductor thereof, n-1 capacitors and a diode; each of the other modules is composed of an inductor, a main power switch and drain and source spurious capacitors thereof, a transformer and a drain inductor thereof, n capacitors and a diode; and the adjustment on input and output gains of the converter and voltage stress of the switching devicecan be achieved by adjusting the size of n. The adjustment on the current stress of the switching device in the converter can be achieved by adjusting the number of the modules. In addition, the problem that the voltage stress of the switching tube is high due to the leakage inductance is relieved via a clamping circuit, and thus the efficiency of the converter is improved. The high gain modular high capacity isolated DC / DC converter is relatively applicable to the applicable occasions needing electrical isolation, high power and high gain boosting conversion.

Description

technical field [0001] The invention relates to an isolated DC / DC converter, in particular to a high-gain modularized large-capacity isolated DC / DC converter. Background technique [0002] In recent years, offshore wind power technology has developed rapidly, and its DC confluence field usually requires a voltage gain of tens of times or even higher. The maximum capacity of a single wind turbine has exceeded 10mw, and the capacity of common offshore wind turbines is also above 2.5mw, requiring high input and output. Gain, large capacity and high reliability DC / DC converter. In traditional isolated boost converters, the output voltage gain is usually achieved by enlarging the turns ratio of the primary and secondary windings of the transformer. There are problems of high voltage and current stress of switching devices; the solution to large-capacity power conversion is usually multi-module parallel operation, but this solution is difficult to share current and the control st...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems existing in the existing large-capacity 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, the present invention proposes a high-gain modular large Capacitive isolated DC / DC converter

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