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Current-limiting protection device

A current-limiting protection and current-limiting control technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve the problems of unnecessary protection and cost increase of AC input, so as to ensure normal power supply, improve reliability, achieve simple effects

Inactive Publication Date: 2003-11-12
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can prevent the internal temperature of the power supply from being too high while preventing the output load from being too large, but there is no necessary protection for the AC input, and power devices with a large margin must be selected, which increases the cost

Method used

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Embodiment Construction

[0020] The current-limiting retraction protection device of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments:

[0021] figure 1 It is a functional block diagram of the present invention: the output current sampling signal I of the power supply 0 directly input to the output current detection circuit 101 for voltage division, and output a current detection signal, the multi-level current limiting control circuit 105 adjusts the size of the current detection signal according to the input multi-channel control signal, and the adjusted current detection signal is then input to the comparison circuit 104;

[0022] The current limit point reference circuit 103 provides a current reference signal, the magnitude of which is unchanged in the output current constant current limit segment, and is proportional to the voltage detection signal output by the output voltage detection circuit 102 during the retraction segm...

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Abstract

The current limiting protection device comprises the output current detection circuit for obtaining the sampling signal of the output current of the voltage division power source, outputting the current detection signal in proportion to the said output current. The multistage current limit control circuit for adjusting the voltage ratio of the current sampling signal of the output current detection circuit. The output voltage detection circuit for outputting the voltage detection signal, which is proportion to the output voltage signal of the voltage division power source. The current limiting point reference circuit for providing the constant current reference signal or the signal being proportion to the voltage detection signal. The comparison circuit for outputting the current limit control signal. Based on the working condition, the invention changes the output current limiting point of the power source so as to realize output power protection.

Description

technical field [0001] The invention relates to the technical field of power supply protection, in particular to an output current limiting protection device. Background technique [0002] The power supply is an important part of the communication system. It is used to convert the AC power into the DC power required by the electrical equipment. It requires the power supply to be adjusted in time when the input, output and internal working conditions are very bad, so as to maintain the normal power supply of the equipment. Instead of frequent shutdown protection, the power supply can be protected, otherwise it will affect its reliability. Usually the power supply achieves the purpose of protection by limiting the output power. There are currently three protection measures for the power supply: [0003] Constant current limiting, that is: when the output of the power supply is overloaded, the output current of the power supply remains unchanged and the output voltage drops. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/10
Inventor 戴彬传张前刘灵
Owner ZTE CORP
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