CN202121314U - A 48 V circuit hot swap protective device - Google Patents

A 48 V circuit hot swap protective device Download PDF

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Publication number
CN202121314U
CN202121314U CN2011202360588U CN201120236058U CN202121314U CN 202121314 U CN202121314 U CN 202121314U CN 2011202360588 U CN2011202360588 U CN 2011202360588U CN 201120236058 U CN201120236058 U CN 201120236058U CN 202121314 U CN202121314 U CN 202121314U
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CN
China
Prior art keywords
module
current
circuit
protective device
hot swap
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN2011202360588U
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Chinese (zh)
Inventor
肖兰
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Individual
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Individual
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Publication date
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Priority to CN2011202360588U priority Critical patent/CN202121314U/en
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Publication of CN202121314U publication Critical patent/CN202121314U/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

A 48 V circuit hot swap protective device includes a surge current control module, a current-limiting module and a thermally cutoff module. The surge current control module, the current-limiting module and the thermally cutoff module are connected in consequence. In the 48 V circuit hot swap protective device, the surge current control module can prevent surge phenomenon generated in a swap process and smooth the current; the current-limiting module can prevent an over-current case in the swap process, and limit the largest current; and the thermally cutoff module turns off the circuit once the instant temperature is detected to reach a threshold value, and the heat protection is formed.

Description

48V circuit hot swap protective device
Technical field
The utility model relates to a kind of circuit protection device, especially 48V circuit hot swap protective device.
Background technology
When circuit board inserted charged backboard, the shunt capacitance of power module or Switching Power Supply input can suck very big surge current on the circuit board when they discharge.Uncontrolled surge current will cause transient fault on system power supply, the device on the damaged line plate lacks a kind of line protection device of hot connecting and disconnecting easily in a lot of electric equipments.
Summary of the invention
In order to overcome the shortcoming that traditional 48V circuit arrangement lacks a kind of hot connecting and disconnecting line protection device.The utility model provides a kind of 48V circuit hot swap protective device, thus make allow to be adopted thinner circuit board wiring by protective circuit, can use and allow to adopt general small-sized component on cheap miniature connector, the power channel.
The utility model solves the technical scheme that its technical problem adopted: 48V circuit hot swap protective device; Comprise surge current control module, current limliting module, heat shutoff module; It is characterized in that surge current control module, current limliting module, heat are turn-offed module and connected successively.48V circuit hot swap protective device prevents the surge phenomenon that the plug process produces through the surge current control module; Smoothing current, the current limliting module prevents the overcurrent condition in the hot plug process, the restriction maximum current; Heat is turn-offed module detection instantaneous temperature and is reached then breaking circuit of fault value, forms the heat protection.
The beneficial effect of the utility model is in system, behind the interpolation circuit hot swap protective device, can reduce the requirement to main power source, thereby remedy the raising of system cost.
Description of drawings
Fig. 1 is the theory diagram of the utility model; Fig. 2 is the electric structure chart of the utility model.
Embodiment
In Fig. 1,48V circuit hot swap protective device comprises surge current control module 1, current limliting module 2, heat shutoff module 3, and surge current control module 1, current limliting module 2, heat are turn-offed module 3 and connected successively.48V circuit hot swap protective device prevents the surge phenomenon that the plug process produces through surge current control module 1; Smoothing current; Current limliting module 2 prevents the overcurrent condition in the hot plug process; Restriction maximum current, heat turn-off module 3 detection instantaneous temperatures and reach then breaking circuit of fault value, form the heat protection.
In Fig. 2, surge current control module 1 adopts MAX5920, can be installed in backboard or movably on the circuit-board card, through an outside N channel mosfet adjustment pipe powering load of on power channel, placing.When circuit board links with backboard first; Between GATE pin and VEE, to have internal dynamic clamped with moving MAX5920 on the grid voltage to for the drain electrode of Q1 and the electric capacity between the grid; It is low can during heat is inserted, keeping the gate source voltage of Q1, prevents that Q1 from giving load with uncontrolled current delivery.In great majority are used, can save outside grid source electric capacity.In the integrated circuit board insertion process, resistance R 3 is used for limiting the electric current that flows into clamped circuit.MAX5920 inner integrated current-limiting function and circuit breaker, so as load current excessive with short-circuit conditions under protective circuit.Voltage through detecting outside inspection leakage resistance between VEE and the SENSE comes monitor load current.If the voltage between V EE and the SENSE reaches current limliting threshold voltage (V CL), MAX5920 can draw electric current to realize the load current adjusting from the GATE end.This has just reduced the gate source voltage of outside MOSFET, thereby reduces load current, and MAX5920 comprises an internal die temperature monitor, and when die temperature reached heat shutoff threshold values T OT, the MOSFET grid was dragged down, disconnecting external MOSFET.If good passage of heat is arranged between MOSFET and the MAX5920, chip can be outside MOSFET the heat protection is provided.Because most of power consumption in drain electrode, is placed MAX5920 near the drain electrode of outside MOSFET, can obtain best heat protection effect.

Claims (1)

1. 48V circuit hot swap protective device; Comprise surge current control module (1), current limliting module (2), heat shutoff module (3); It is characterized in that surge current control module (1), current limliting module (2), heat are turn-offed module (3) and connected successively.
CN2011202360588U 2011-07-06 2011-07-06 A 48 V circuit hot swap protective device Expired - Fee Related CN202121314U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011202360588U CN202121314U (en) 2011-07-06 2011-07-06 A 48 V circuit hot swap protective device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011202360588U CN202121314U (en) 2011-07-06 2011-07-06 A 48 V circuit hot swap protective device

Publications (1)

Publication Number Publication Date
CN202121314U true CN202121314U (en) 2012-01-18

Family

ID=45462351

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2011202360588U Expired - Fee Related CN202121314U (en) 2011-07-06 2011-07-06 A 48 V circuit hot swap protective device

Country Status (1)

Country Link
CN (1) CN202121314U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103227630A (en) * 2013-04-18 2013-07-31 杭州和利时自动化有限公司 Hot plug method and hot plug circuit suitable for heavy working current
CN104104070A (en) * 2013-04-07 2014-10-15 鸿富锦精密电子(天津)有限公司 Surge current regulating circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104104070A (en) * 2013-04-07 2014-10-15 鸿富锦精密电子(天津)有限公司 Surge current regulating circuit
CN103227630A (en) * 2013-04-18 2013-07-31 杭州和利时自动化有限公司 Hot plug method and hot plug circuit suitable for heavy working current
CN103227630B (en) * 2013-04-18 2016-04-13 杭州和利时自动化有限公司 A kind of hot-plug method and circuit being applicable to large operating current

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Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20120118

Termination date: 20120706