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Method and circuit for restraining surge current of DC electrical source

A surge current, DC power supply technology, applied in battery circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, circuit devices, etc. , to achieve the effect of improving reliability and efficiency, suppressing inrush current, and simple circuit implementation

Inactive Publication Date: 2016-02-10
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the problem of impact on the internal components of the power supply caused by the surge current between the input power supply and the secondary power supply and the excessive transient power of the switch in the prior art, a method and circuit for suppressing the surge current of the DC power supply are proposed

Method used

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  • Method and circuit for restraining surge current of DC electrical source
  • Method and circuit for restraining surge current of DC electrical source
  • Method and circuit for restraining surge current of DC electrical source

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Embodiment Construction

[0042]Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0043] Generally, there will be an energy storage unit between the power supply DC power supply and the load. Its function is to stabilize the fluctuation of the input power supply voltage and balance the input impedance of the load end. However, when the input power supply is started, the circuit first charges the energy storage capacitor when the energy storage unit is introduced. , there is a very large di / dt at the beginning of c...

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Abstract

The present invention discloses a method and a circuit for restraining surge current of a DC electrical source. The method includes the steps as follows: a secondary electric power supply is connected to a power supply, and charges an energy storage unit through a constant-current source circuit; a voltage detection circuit drives a time delay circuit when the voltage detection circuit detects that the voltage of an energy storage capacitor in the energy storage unit reaches to a preset voltage value; the time delay circuit drives a switch unit to be opened slowly until the switch unit is fully conducted; the switch unit bypasses the constant-current source circuit and charges the energy storage unit. According to the technical scheme of the present invention, the impact current can be restrained, and the voltage drop of a slow startup switch during starting can be reduced.

Description

technical field [0001] The invention relates to the field of communication power supply equipment, in particular to a surge current suppression method and circuit of a DC power supply. Background technique [0002] In communication equipment, the power supply is a system device that supplies power to the secondary power supply in different ways. There is an energy storage unit connected between the secondary power supply and the power supply. The energy storage unit is connected to the power supply circuit. During the power-on process of the system, an inrush current will be generated transiently. The transient change of this current will cause the input power supply voltage to drop, or the arc phenomenon will occur when the secondary equipment is connected to the power supply, which will cause impact on the internal components of the power supply, such as the slow start switch. The transient power is too large. The surge current imitation circuit of power input is widely u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/02H02J7/00
CPCG06F1/26H02M1/36
Inventor 严永红
Owner ZTE CORP
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