Voltage-sharing control method of converter interconnection system and feedback control circuit of converter

Abstract

The invention relates to interconnection system control of multiple converter modules in input serious connection and output parallel connection in a switch power source, and particularly relates to a control method of multiple converter interconnection systems in input serious connection and output parallel connection and a feedback control circuit of a single converter therein. The voltage-shearing control method of the converter interconnection system is used for achieving system closed-loop control over the multiple converters in input serious connection and output parallel connection, and input automatic voltage-shearing of the converter interconnection systems is achieved by increasing voltage adjusting rate of the single converter, and through a positive correlation feature of an input current and an input voltage of the single converter. When the converter modules are in input serious connection and output parallel connection, if the input voltage of one converter module is higher than that of other converter modules, the output voltage of the converter module is slightly higher than that of other converter modules, thus the output current of the converter module can be also increased, therefore causing that the output current increases and the output voltage reduces, and finally the voltage of the converter module is the same with that of other converter modules.

Description

technical field [0001] The invention relates to the interconnection system control of a plurality of converter modules connected in series and output in parallel in a switching power supply, especially the control method for the interconnection system of asymmetrical half-bridge flyback converters connected in series and outputs in parallel and the feedback of a single converter therein Control circuit. Background technique [0002] After the power converter modules with the same structure are connected in series and output in parallel, a system with higher input voltage and higher output current than a single module can be obtained. The input voltage of the power system after the combination of N modules is N times the highest input voltage of a single module, and the output power is also N times that of a single module. Therefore, the input of the power supply module (also called a converter module) connected in series and output in parallel can be used in occasions where...

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Problems solved by technology

[0010] In view of this, in order to solve the problem that the input terminals of the input series output parallel circuit of the existing closed-loop control module in the interconnection system of the converter cannot equalize the voltage, a closed-loop system for the input series output parallel converter interconnection system is proposed. The control method can not only realize the independent closed-loop voltage regulation control of a single converter module, but also realize the input voltage equalization and output voltage stabilization of the converter interconnection system in the case of multiple converters connected in series and output in parallel.

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