CN107221922A - A kind of overvoltage self-protection circuit - Google Patents
A kind of overvoltage self-protection circuit Download PDFInfo
- Publication number
- CN107221922A CN107221922A CN201710568342.7A CN201710568342A CN107221922A CN 107221922 A CN107221922 A CN 107221922A CN 201710568342 A CN201710568342 A CN 201710568342A CN 107221922 A CN107221922 A CN 107221922A
- Authority
- CN
- China
- Prior art keywords
- receiving end
- protection circuit
- feeder ear
- overvoltage self
- protector
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
Abstract
The present invention is a kind of overvoltage self-protection circuit; including protector, feeder ear and receiving end; described protector is connected between feeder ear and receiving end; described feeder ear is connected with PoE networks; described receiving end is connected with GND networks, and described protector includes TVS diode and the resettable fuse being connected.Pass through above-mentioned, of the invention overvoltage self-protection circuit, it can be ensured that will not be damaged when receiving end equipment is transfused to beyond the supply voltage of its upper voltage limit, normal work is remained to when subsequently inputting standard operating voltage.
Description
Technical field
The present invention relates to the field in communications electronics field, more particularly to a kind of overvoltage self-protection circuit.
Background technology
With developing rapidly for wireless communication technology, diversified trend is also presented in the power supply mode of communication equipment, wherein
There is a kind of power supply mode referred to as PoE（Power Over Ethernet）.PoE can be divided into two ways：A kind of support standard
PoE agreements, meet 802.3af or 802.3at standards；It is another not support standard PoE agreements, netting twine is simply borrowed to power.
Standard PoE agreements have the electric sequence of voltage from low to high, it is ensured that receiving end is working properly.And non-standard PoE is supplied
Circuit is by the way of direct power supply, the negotiations process without voltage from low to high, when input voltage beyond receiving end most
Receiving end damage is will result in during high voltage, it is therefore desirable to which a kind of protection circuit under overpressure situation ensures that receiving end will not be by
Damage.
The content of the invention
The present invention solves the technical problem of provide a kind of overvoltage self-protection circuit, it can be ensured that in receiving end equipment
It will not be damaged when being transfused to beyond the supply voltage of its upper voltage limit, normal work is remained to when subsequently inputting standard operating voltage
Make.
In order to solve the above technical problems, one aspect of the present invention is：There is provided a kind of overvoltage self-protection electricity
Road, including protector, feeder ear and receiving end, described protector are connected between feeder ear and receiving end, described confession
Electric end is connected with PoE- networks, and described receiving end is connected with GND networks, and described protector includes the TVS being connected
Diode and fuse.
In a preferred embodiment of the present invention, described feeder ear is dc source or PoE power supply modules.
In a preferred embodiment of the present invention, described receiving end is Wireless Telecom Equipment.
In a preferred embodiment of the present invention, described TVS diode is connected in parallel with feeder ear and receiving end.
In a preferred embodiment of the present invention, described fuse uses resettable fuse.
In a preferred embodiment of the present invention, load is provided with described receiving end, is included in described load
High-voltage capacitance.
The beneficial effects of the invention are as follows：A kind of overvoltage self-protection circuit of the present invention, it can be ensured that in receiving end equipment quilt
It will not be damaged when input is beyond the supply voltage of its upper voltage limit, normal work is remained to when subsequently inputting standard operating voltage
Make, clear principle, circuit is simple, and device is few, reliability is high, can be effectively prevented from receiving end by high-tension damage.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, makes required in being described below to embodiment
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, on the premise of not paying creative work, it can also obtain other according to these accompanying drawings
Accompanying drawing, wherein：
Fig. 1 is a kind of theory structure block diagram of a preferred embodiment of overvoltage self-protection circuit of the invention；
Fig. 2 is the circuit diagram of protector in Fig. 1；
Mark in accompanying drawing for：10th, feeder ear, 20, protector, 30, receiving end, D1, TVS diode, F1, fuse are L1, negative
Carry.
Embodiment
The technical scheme in the embodiment of the present invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, this area is common
All other embodiment that technical staff is obtained under the premise of creative work is not made, belongs to the model that the present invention is protected
Enclose.
As depicted in figs. 1 and 2, the embodiment of the present invention includes：
A kind of overvoltage self-protection circuit, including protector 20, feeder ear 10 and receiving end 30, described protector 20 are connected to
Between feeder ear 10 and receiving end 30, described feeder ear 10 is connected with PoE- networks, described receiving end 30 and GND networks
It is connected, described protector 20 includes the TVS diode D1 being connected（TRANSIENT VOLTAGE SUPPRESSOR, wink
Time variant voltage suppresses diode）, fuse F1.Wherein, described fuse F1 uses resettable fuse.
In above-mentioned, described feeder ear 10 is dc source or PoE power supply modules, or any to export perseverance
Determine voltage, the equipment that certain electric current is provided；Described receiving end 30 is Wireless Telecom Equipment.
Further, described TVS diode D1 is connected in parallel with feeder ear 10 and receiving end 30.In the present embodiment,
Load L1, described load L1 are provided with described receiving end 30（Receiving end）In include high-voltage capacitance（Figure is not regarded）.
When feeder ear 10 gives the voltage that receiving end 30 is provided for the voltage needed for its normal work, protector 20 is not opened
Dynamic, receiving end 30 can normally start and keep normal work.
When voltage certain numerical value needed for feeder ear 10 is higher by its normal work to the voltage that receiving end 30 is provided, protector
20 start, the workflow of protector 20：When TVS diode D1 two ends are subjected to beyond the voltage of its normal range of operation, TVS
Times of the diode D1 to be exceedingly fast（Ps grades）The impedance value at its two ends is changed into Low ESR from high impedance, an instantaneous big electricity is produced
Stream, the high current flows to GND networks by resettable fuse F1 by PoE- networks, now resettable fuse F1 own temperatures
Abruptly increase, the quick rise of temperature causes resettable fuse F1 resistance to greatly improve, so that resettable fuse F1 is in
High-impedance state, makes to keep open circuit between PoE- networks and GND networks, input voltage is not flowed back normally road
Footpath, it is ensured that the two ends of receiving end 30 do not have voltage, reaches that protection receiving end 30 exempts from injured purpose.
In summary, a kind of overvoltage self-protection circuit of the invention, it can be ensured that be transfused in receiving end equipment beyond it
It will not be damaged during the supply voltage of upper voltage limit, remain to normal work when subsequently inputting standard operating voltage, clear principle,
Circuit is simple, and device is few, and reliability is high, can be effectively prevented from receiving end by high-tension damage.
Embodiments of the invention are the foregoing is only, are not intended to limit the scope of the invention, it is every to utilize this hair
Equivalent structure or equivalent flow conversion that bright description is made, or directly or indirectly it is used in other related technology necks
Domain, is included within the scope of the present invention.
Claims (6)
1. a kind of overvoltage self-protection circuit, it is characterised in that including protector, feeder ear and receiving end, described protector
It is connected between feeder ear and receiving end, described feeder ear is connected with PoE- networks, described receiving end and GND network phases
Connection, described protector includes TVS diode and the fuse being connected.
2. overvoltage self-protection circuit according to claim 1, it is characterised in that described feeder ear be dc source or
PoE power supply modules.
3. overvoltage self-protection circuit according to claim 1, it is characterised in that described receiving end sets for radio communication
It is standby.
4. overvoltage self-protection circuit according to claim 1, it is characterised in that described TVS diode is and feeder ear
It is connected in parallel with receiving end.
5. overvoltage self-protection circuit according to claim 1, it is characterised in that described fuse is insured using self- recoverage
Silk.
6. overvoltage self-protection circuit according to claim 1, it is characterised in that load is provided with described receiving end,
Include high-voltage capacitance in described load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710568342.7A CN107221922A (en) | 2017-07-13 | 2017-07-13 | A kind of overvoltage self-protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710568342.7A CN107221922A (en) | 2017-07-13 | 2017-07-13 | A kind of overvoltage self-protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107221922A true CN107221922A (en) | 2017-09-29 |
Family
ID=59953127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710568342.7A Pending CN107221922A (en) | 2017-07-13 | 2017-07-13 | A kind of overvoltage self-protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107221922A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109088391A (en) * | 2018-09-18 | 2018-12-25 | Tcl-罗格朗国际电工（惠州）有限公司 | Short-circuit protection circuit and nonstandard POE charger |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2371715Y (en) * | 1999-05-11 | 2000-03-29 | 谷家银 | Lightning arrestor for communication terminal equipment |
| CN2641880Y (en) * | 2003-07-01 | 2004-09-15 | 华为技术有限公司 | Power source circuit |
| US20120127619A1 (en) * | 2010-11-23 | 2012-05-24 | Adrian Mikolajczak | Input power port protection component |
-
2017
- 2017-07-13 CN CN201710568342.7A patent/CN107221922A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2371715Y (en) * | 1999-05-11 | 2000-03-29 | 谷家银 | Lightning arrestor for communication terminal equipment |
| CN2641880Y (en) * | 2003-07-01 | 2004-09-15 | 华为技术有限公司 | Power source circuit |
| US20120127619A1 (en) * | 2010-11-23 | 2012-05-24 | Adrian Mikolajczak | Input power port protection component |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109088391A (en) * | 2018-09-18 | 2018-12-25 | Tcl-罗格朗国际电工（惠州）有限公司 | Short-circuit protection circuit and nonstandard POE charger |
| CN109088391B (en) * | 2018-09-18 | 2023-10-17 | 罗格朗智能电气(惠州)有限公司 | Short-circuit protection circuit and nonstandard POE power supply |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170929 |