A current sharing control circuit for parallel output of two power modules

Abstract

A current-sharing control circuit used for output and parallel connection of two paths of power supply modules is disclosed. The circuit comprises a resistor RC1, a resistor RCj, a resistor R1, a resistor R1A, a resistor Rj, a resistor RjA, an output capacitor CO, a linear voltage regulator A1 and a linear voltage regulator Aj. An input power supply Vin1, an input power supply Vin2, an input power supply Vin3, ..., VinN are N paths of voltages to be balanced. When an Aj output current is increased or decreased, a feedback voltage fed back to the Aj in a current-sharing control circuit is increased or decreased correspondingly. The Aj increases an internal adjusting tube impedance so that an output voltage Vout of the Aj is decreased or increased correspondingly. And then the output current of the Aj is adjusted till that output currents of output branches are recovered to be equal. In the invention, based on a condition that output voltage stability of multipath output converters is guaranteed, capacity expanding is performed on an output current so that the linear voltage regulator can be applied to a large current output occasion, and a good suitable value is possessed.

Description

technical field [0001] The invention relates to a current sharing control technology, in particular to a current sharing control circuit for parallel connection of outputs of two power supply modules. Background technique [0002] In order to meet the requirements of various integrated circuit power supply voltages, the existing integrated circuit power supply system needs to have a variety of different voltage outputs. To meet the above requirements, a DC converter can be designed for each output voltage, but this solution will increase the cost of the power supply line , volume increase, and loss increase, it is impossible to meet the miniaturization and high-efficiency design requirements of the product. Therefore, multi-output DC converters are usually used in the design of integrated circuit power supply lines to reduce product cost, volume, and loss. [0003] According to the principle that the output voltage of each winding of the transformer is proportional to the nu...

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, to provide a current sharing control circuit for output parallel connection of two power supply modules, and to solve the problem of the parallel connection of linear regulators to increase the applicable capacity of the output current. The current of multiple linear regulators is unbalanced, resulting in the problem that the working current of some linear regulators exceeds the rated working current of components

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