Short circuit retraction control protection method and system for direct current module based on digital signal processing

A DC module, control and protection technology, applied in the direction of output power conversion devices, electrical components, etc., can solve the problems of poor flexibility, slow protection speed, long fault processing cycle, etc., and achieve the effect of flexible setting and fast protection speed

Inactive Publication Date: 2012-10-17
BEIJING DINGHAN TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The disadvantage of short-circuit logic protection technology is: short-circuit logic protection is a kind of hard protection. Once a short-circuit fault is identified in the module, the module can only be shut down, stop external output, and restart after the fault is eliminated.
It has the characteristics of long fault processing period, poor flexibility, etc., and the protection speed is too slow, so it cannot be independently applied in the AC module

Method used

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  • Short circuit retraction control protection method and system for direct current module based on digital signal processing
  • Short circuit retraction control protection method and system for direct current module based on digital signal processing
  • Short circuit retraction control protection method and system for direct current module based on digital signal processing

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Embodiment 1

[0053] The solution of the embodiment of the present invention is realized in the digital processing chip DSP.

[0054] Figure 4 It is a flow chart of the DSP-based DC module short-circuit retraction control and protection method of the present invention.

[0055] S401: Acquire an input voltage, acquire a preset current limit point, acquire a preset current threshold, acquire a preset first voltage threshold, acquire a preset second voltage threshold, and acquire a preset third voltage threshold;

[0056] The current limiting point, the current threshold, the first voltage threshold, the second voltage threshold and / or the third voltage threshold are all preset values. In a specific application, if these values After practice, it needs to be fixed and not suitable for modification. It can be written into the digital processing chip DSP in the form of a fixed value; if it needs to be adjusted according to different situations, it can be set in the host computer.

[0057] Whe...

Embodiment 2

[0083] see Figure 8 , the present embodiment provides a DSP-based DC module short-circuit retraction control and protection system, the system comprising:

[0084] The current limit adjustment module 801 is connected to the output current adjustment module, and is used to adjust the current limit according to the preset current limit, the preset first voltage threshold, the preset second voltage threshold and the input voltage of the DC module and sending the current limiting point to the output current adjustment module, the first voltage threshold is higher than the second voltage threshold, and the current limiting point is a current value;

[0085] In this module, refer to Embodiment 1 for the specific implementation manner of adjusting the current limit point, which will not be repeated here.

[0086] The output current adjustment module 802 is connected with the current limit point adjustment module and the short circuit retraction module, and is used to receive the cu...

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Abstract

The invention discloses a short circuit retraction control protection method and a short circuit retraction control protection system for a direct current module based on digital signal processing (DSP). The method comprises the following steps of: S1, adjusting a preset current limiting point according to the relation among the input voltage of the direct current module, a preset first voltage threshold value and a preset second voltage threshold value, wherein the first voltage threshold value is higher than the second voltage threshold value; and the current limiting point is a current value; S2, adjusting the output current of the direct current module according to the current limiting point; and S3, when the current limiting point is higher than the preset current threshold value and the output voltage of the direct current module is lower than a third preset voltage threshold value, adjusting the current limiting point to lower the current limiting point according to the output voltage, and returning to the step S2. The defects of high dependence on hardware and low flexibility are overcome, and the direct current module can adapt to the condition of a short circuit in long time, and the method is high in adjustment speed, low in impact and flexible in configuration.

Description

technical field [0001] The invention relates to the technical field of fail-safe circuits, in particular to a DSP (Digital Signal Processing, digital signal processor)-based DC module short-circuit retraction control protection method and system thereof. Background technique [0002] Since the high-frequency switching power supply works under the condition of high-frequency power output, the internal or external abnormal working conditions of the module may cause the abnormal operation of the module, which will seriously affect the normal operation of the power supply system. Usually, it is necessary to carry out fault protection for the power supply module Design, in which short-circuit fault is one of the serious fault types, more attention should be paid to it. [0003] In the actual working process, the switching power supply may be short-circuited due to the failure of the internal components of the module, such as short-circuit of the output diode, or human misoperatio...

Claims

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Application Information

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IPC IPC(8): H02M1/32
Inventor 高国振付建伟刘延
Owner BEIJING DINGHAN TECH GRP CO LTD
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