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A current sharing control circuit applied to the primary side of a module power supply

A technology of module power supply and primary side, applied in control/regulation systems, electrical components, regulating electrical variables, etc., can solve the problems of low current sharing accuracy, simple circuit, inability to use high-precision, high-reliability electronic equipment, etc. Achieve the effect of improving reliability, current balance, and optimizing the circuit

Active Publication Date: 2021-10-29
七四九(南京)电子研究院有限公司
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  • 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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  • A current sharing control circuit applied to the primary side of a module power supply
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  • A current sharing control circuit applied to the primary side of a 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 the primary side of a module power supply, which includes: the primary side current sampling circuit samples the primary side current and is connected with the primary side current amplification circuit, and the primary side current The amplifying circuit amplifies the input current signal; the output terminal of the primary side current amplifying circuit is connected to the input terminal of the current error amplifier; the current error amplifier compares the current difference between the primary side current of the power supply and the primary side current of other power supplies connected in parallel with the power supply , and amplify the error signal; the error signal is regulated by the resistance attenuation network and drives the varactor to adjust the voltage of the COMP pin of the PWM controller, thereby adjusting the duty cycle of the PWM controller and adjusting the output voltage to achieve a regulated output current, the present invention adopts the controlled impedance to adjust the potential of the COMP pin of the PWM controller, realizes the current equalization control, and achieves the purpose of equalizing the output current of each parallel module.

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 Patents(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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