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

A modular power supply and primary-side technology, applied in control/regulation systems, electrical components, and regulation of electrical variables, etc., can solve the problems of low current sharing accuracy, simple circuit, and inability to apply high-precision and high-reliability electronic equipment

Active Publication Date: 2021-08-20
七四九(南京)电子研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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

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Embodiment Construction

[0041] Below will combine the appended in the embodiment of the present invention Figure 1-3 , clearly and completely describe the technical solutions in the embodiments of the present invention, obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0042] In the present invention, the chip U1 contains two identical functional unit circuits, that is, two-channel operational amplifiers, and the constituent units are U1A and U1B. The use of the composite chip U1 can reduce the number of components.

[0043] Moreover, in the present invention, there are two identical units inside the chip U2, namely the unit one transistor U2A and the unit two transistor U2B, and the use of the composite chip U2 can reduce the n...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155
CPCH02M3/155
Inventor 张自飞李鹏生许鑫宁慧
Owner 七四九(南京)电子研究院有限公司
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