Soft-starting circuit of power supply

A technology of slow start circuit and power supply, applied in emergency protection circuit devices, circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., can solve problems such as large current energy consumption, power supply shock, etc. Achieve the effect of small static loss, low loss, and avoid the impact of inrush current

Inactive Publication Date: 2010-02-03
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The problem to be solved by the present invention is to provide a slow start circuit for a power supply to solve the problem of the impact of the excessive input current on the power supply and the need for a large current when the work is normal and the problem of high energy consumption in the prior art

Method used

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Embodiment Construction

[0017] The core idea of ​​the present invention is: when the power supply is initially powered, the current limiting unit is used to limit the maximum current allowed to flow in, which avoids the impact of the impact current of the board when the board is powered on; at the same time, the switch unit is used to allow a large current to pass, thereby ensuring normal The current required for work, because the current limiting unit only works when the power supply is initially powered on, the loss caused by current limiting is negligible, and the static loss of the switching unit is very small, so the loss of the entire slow start circuit is very small. In addition, the capacity of the energy storage unit is not limited, so that the board can provide an energy storage unit of any capacity according to actual needs.

[0018] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and preferred embodiments.

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Abstract

The invention relates to a soft-starting circuit of power supply, belonging to the technical field of power control. The soft-starting circuit is arranged between the power supply and a main body unit. One input end of the main body unit is connected with an output end of the power supply. The soft-starting circuit comprises a switch unit, a current limit unit, an energy storage unit and a controlunit, wherein the switch unit is connected with the current limit unit in parallel, the front end of a parallel branch thereof is connected to another output end of the power supply, and the rear endof the parallel branch is connected to one end of the energy storage unit and another output end of the main body unit; the other end of the energy storage unit is connected to one output end of thepower supply; a first end of the control unit is connected to a control end of the switch unit, and a second end of the control unit is connected to a control end of the main body unit; and the control unit controls the disconnection and the connection of the switch unit so as to control the power supply to supply power to the main body unit. The technical scheme can reduce the energy consumptionand protect the power supply.

Description

technical field [0001] The invention relates to the technical field of power supply control, in particular to a slow start circuit of a power supply. Background technique [0002] In the board-type equipment, the power supply supplies power to each board through the backplane, and each board is equipped with an energy storage unit at the power input port of the board for its own work stability requirements. When each board is powered on on the plug-in board, the energy storage unit is connected to the power supply, causing an instantaneous power-on surge current, which often causes an instantaneous drop in the power supply voltage and affects the working stability of other boards in the system. When the device is powered on as a whole, it will also cause a momentary drop in the power supply voltage, affecting the working stability of other devices. [0003] In order to maintain the stability of the system work, a slow start circuit is often provided at the power input port ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/02
CPCH02M1/36
Inventor 石鸿斌
Owner ZTE CORP
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