Converter Feedback Control Circuit

Abstract

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, in particular to the control method for the interconnection system of a plurality of converter modules connected in series and output in parallel and the feedback control circuit of a single converter therein. Among them, the voltage equalization control method of a converter interconnection system provided by the present invention is used to realize the system closed-loop control of a plurality of converters connected in series and output in parallel, by increasing the voltage regulation rate of a single converter, to pass a single converter The positive correlation between the input current and the input voltage of the converter is used to realize the automatic input voltage equalization of the converter interconnection system. When the input of a converter module is connected in series and output in parallel, if its input voltage is higher than that of other converter modules, the output voltage of this converter module will be slightly higher than that of other converter modules, so its output current will also increase, resulting in an increase in the input current As the voltage increases, the voltage of the input capacitor drops and eventually becomes equal to the voltage 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...

AI Technical Summary

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.

Images