Power conversion module and power supply system formed by series-parallel connection of power conversion module

Abstract

The invention discloses a power conversion module. The power conversion module has two loops, wherein one loop is an output voltage-stabilizing ring used for controlling an output voltage to be stable while the other loop is an input grading ring used for controlling the value of an input voltage of the module; according to the power supply system with serial connection input and parallel connection output for N modules, voltage sharing of the input voltage of each module can be realized by virtue of the loops, so that the requirements of inputting equalized voltage and outputting equalized current of the power supply system with serial connection input and parallel connection output can be satisfied; in addition, it is ensured that the power supply system has high output voltage precision; direct series-parallel connection of multiple modules is realized, and the power supply system is more flexible; and compared with a two-stage scheme, higher efficiency, more stable output and no influence from topology can be achieved.

Description

technical field [0001] The patent of the present invention relates to a power conversion module and a power supply system, especially for high-voltage input and modular applications. Background technique [0002] In the application system of switching power supply, high-voltage input occasions, such as photovoltaic power supply, generally have a wide input range and high input voltage, and the high voltage can reach 1500V or even higher. Therefore, it is necessary to increase the rated voltage of the switching tube of the subsequent stage converter. However, the on-state resistance of high-voltage MOSFET is large, resulting in large conduction loss and high cost; some people say that IGBT can be used as a switch tube, but although the saturation voltage drop of IGBT is small, there is a phenomenon of current tailing, which limits the increase in switching frequency. , It is not conducive to reducing the volume of transformers and filter devices (inductors, capacitors), coupl...

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Problems solved by technology

[0041] It can be seen from the above three tables that after the input of the two modules is connected in series and output in parallel, the accuracy of the input voltage equalization and output current equalization of the two modules can be satisfied, but the output voltage range is larger than the input voltage range. The current ACDC bus voltage range is 5:1 or so, then the design of the post-stage voltage regulator module is extremely difficult

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