Current sharing control circuit applied to primary side of module power supply

Abstract

The invention discloses a current sharing control circuit applied to a primary side of a module power supply. A primary side current sampling circuit is used for sampling a primary side current and is connected with a primary side current amplifying circuit, and the primary side current amplifying circuit is used for amplifying an input current signal; the output end of the primary side current amplification circuit is connected with the input end of the current error amplifier; a current error amplifier compares the current of the primary side of the power supply with the current difference of the primary sides of other power supplies connected in parallel with the power supply, and amplifies an error signal; and the error signal is adjusted through the resistance attenuation network and drives a variable reactor, the COMP pin voltage of the PWM controller is adjusted, and therefore the duty ratio of the PWM controller is adjusted, the output voltage is adjusted, and the output current is adjusted, the COMP pin potential of the PWM controller is adjusted through the controlled impedance, current sharing control is achieved, and the purpose of balancing the output current of each parallel module is achieved.

Description

technical field [0001] The invention belongs to the technical field of circuit design, and in particular relates to a current sharing control circuit applied to the primary side of a module power supply. Background technique [0002] High power density, high reliability DC / DC module power supply is widely used, but the module power supply often requires parallel backup redundancy or power multiplication when used. [0003] The current processing method is: [0004] 1. Adopt a power module with a current sharing function, that is, add a current sharing bus pin on the secondary side, and connect through the current sharing bus pins when multiple modules are connected in parallel. [0005] 2. The current is shared on the primary side of the module power supply, but the general circuit is simple, and it is mostly used in civilian equipment. [0006] However, the current processing method has low current sharing accuracy and cannot be applied to high-precision and high-reliabil...

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Problems solved by technology

[0005] 2. Current sharing on the primary side of the module power supply, but the general circuit is simple, and it is mostly used for civilian equipment

[0006] However, the current processing method has low current sharing accuracy and cannot be applied to high-precision and high-reliability electronic equipment.

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