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A control circuit of a direct current power supply module

A technology of control circuit and DC power supply, which is applied in the direction of conversion equipment, electrical components, and output power conversion devices with intermediate conversion to AC. It can solve the problems of large ripple current at the DC output end and reduce low-frequency current ripple. , easy to transplant, optimize the effect of current output characteristics

Active Publication Date: 2014-01-15
ZHEJIANG SOWEI NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, since there are still some low-frequency AC components in the DC output, when the output voltage is high, a large ripple current will appear at the DC output terminal Out

Method used

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  • A control circuit of a direct current power supply module
  • A control circuit of a direct current power supply module
  • A control circuit of a direct current power supply module

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Embodiment Construction

[0016] Various embodiments of the present invention will be described below with reference to the accompanying drawings. The above-mentioned advantages of the present invention will be more easily understood through the following description.

[0017] The main reason for the ripple in the DC output is that the gain of the voltage stabilization and current sharing control loop of the existing DC power module is low in the low frequency part, for example, the gain at 100 Hz is close to zero. This results in a reduction in the ability of the voltage-stabilizing current-sharing control loop to suppress ripples around 100 Hz. Moreover, since the DC power module has a large output range and a wide load range, if the ripple problem is solved purely through the voltage regulation and current sharing control loop, and at the same time ensure that the control loop characteristics within the entire working range meet the desired requirements, has a certain degree of difficulty. In view...

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PUM

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Abstract

The invention brings forward a control circuit used for controlling a direct current output of a single-phase power supply module, wherein the direct current output of the single-phase power supply module is in parallel connection with at least one another single-phase dc power supply module. The control circuit comprises a voltage stabilization current equalizing ring which is configured to stabilize an output voltage and equalize an output current of the direct current output through the feedback control of a switching-on time and a switching-on frequency of a switch power supply in the single-phase power supply module, and a ripple inhibition ring which is configured to superpose signals corresponding to the detected output current on feedback control signals in the voltage stabilization current equalizing ring in a negative feedback mode. The feedback control signals in the voltage stabilization current equalizing ring are used for controlling the switching-on time and the switching-on frequency of the switch power supply.

Description

technical field [0001] The present invention generally relates to a DC power supply module, and in particular to a DC power supply module operating in parallel. Background technique [0002] The DC power supply system is suitable for providing DC power supply to some electrical devices that require uninterruptible power supply, such as those installed in special institutions such as power plants and substations for control, communication, automatic Electrical equipment for protection, accident lighting, etc. [0003] At present, common DC power systems generally obtain DC output by performing AC / DC conversion on three-phase AC signals. figure 1 A common three-phase DC power supply module is exemplarily shown. This power module can adopt three-phase four-wire AC input, and adopt three-phase current parallel output, so there is no phase sequence requirement, no neutral current loss, etc. Specifically, such as figure 1 As shown, the three-phase DC power module includes a si...

Claims

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Application Information

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IPC IPC(8): H02M3/28H02M1/14
Inventor 胡小勇黄蕾王磊蒋大卫潘叶辉徐永强
Owner ZHEJIANG SOWEI NEW ENERGY TECH
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