CN204424888U - A kind of port circuit of electric power system and lightning protection circuit thereof - Google Patents
A kind of port circuit of electric power system and lightning protection circuit thereof Download PDFInfo
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- CN204424888U CN204424888U CN201520161118.2U CN201520161118U CN204424888U CN 204424888 U CN204424888 U CN 204424888U CN 201520161118 U CN201520161118 U CN 201520161118U CN 204424888 U CN204424888 U CN 204424888U
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Abstract
The utility model embodiment discloses a kind of port circuit and lightning protection circuit thereof of electric power system.This electric power system comprises POE network interface, low-tension supply port, power supply chip, PD chip and lightning protection circuit, PD chip is connected with the output negative pole of POE network interface and the output cathode of low-tension supply port and output negative pole respectively, this lightning protection circuit comprises and has forward conduction and the oppositely circuit unit of cutoff function, the first lightning protection component, the second lightning protection component and the 3rd lightning protection component, wherein: the positive pole of this circuit unit connects the output negative pole of POE network interface; The negative pole of this circuit unit connects the output negative pole of low-tension supply port; Between the output cathode that first lightning protection component is connected to POE network interface and output negative pole; Second lightning protection component one end connects the input positive pole of low-tension supply port, other end ground connection; 3rd lightning protection component one end connects the input negative pole of low-tension supply port, other end ground connection.Avoid big current and cause PD wafer damage through PD chip.
Description
Technical field
The utility model relates to electronic technology field, particularly relates to a kind of port circuit and lightning protection circuit thereof of electric power system.
Background technology
What Power over Ethernet (Power Over Ethernet, POE) was more is applied to outdoor communication product, is especially applied in security protection monitoring system.Usual employing POE and low-tension supply are powered the compatible mode of two kinds of patterns, and a shared power supply chip carries out voltage transitions, POE and low-tension supply two kinds of patterns of powering realize switching by power consumption equipment interface controller (Powered Device Interface Controllers, PD) chip.The electric power system that POE and low-tension supply share a power supply chip comprises POE and to power and low-tension supply is powered two subsystems.Wherein, low-tension supply electric power system is made up of low-tension supply, power supply adaptor and high voltage source, connects power supply adaptor between low-tension supply and high voltage source.Wherein, power supply adaptor is used for converting the high pressure of high voltage source to low-voltage transmission to low-tension supply.Power supply adaptor is divided into ground connection and earth-free two kinds.If low-tension supply needs the power supply adaptor connected to be ground connection, so the input of low-tension supply port is born is ground connection.
POE and low-tension supply are shared to the electric power system of a power supply chip, when having thunder and lightning situation out of doors, POE use Internet Transmission cable and low-tension supply power use power cable often respond to higher lightning voltage, cause inner power supply chip and PD wafer damage, affect it and normally work.Therefore, needing by making lightning protection to POE network interface and low-tension supply port, avoiding inner power supply chip and PD wafer damage.Wherein a kind of implementation is; POE network interface and low-tension supply port are done to install lightning protection component respectively and carries out lightning protection; as shown in Figure 1; transient state power supply killer tube (Transient VoltageSuppressor; TVS) 1 and TVS2 be the lightning protection component of POE network interface, RV1 and RV2 is the lightning protection component of low-tension supply port.Wherein, the operating voltage of TVS2 need be mated with the output voltage of POE, and the output voltage of POE, usually between 48V ~ 58V, causes the operating voltage of TVS2 higher.Because the clamp voltage of TVS2 is greater than operating voltage usually, cause the clamp voltage of TVS2 also higher.
When the clamp voltage of the lightning protection component of POE network interface is higher, if ground connection is born in the input of low-tension supply port, the big current through PD chip in circuit, can be produced, cause PD chip over-voltage breakdown or overcurrent and damage.
Utility model content
The object of the utility model embodiment is to provide a kind of port circuit and lightning protection circuit thereof of electric power system, for addressing the problem: when the clamp voltage of the lightning protection component of POE network interface is higher, if ground connection is born in the input of low-tension supply port, the big current (network interface common mode forward surge) through PD chip can be produced in circuit, cause PD chip over-voltage breakdown or overcurrent and damage.
The object of the utility model embodiment is achieved through the following technical solutions:
Lightning protection circuit in a kind of port circuit of electric power system, this electric power system comprises Power over Ethernet POE network interface, low-tension supply port, the power supply chip that POE network interface and low-tension supply port share, photodiode PD chip and lightning protection circuit, described PD chip is connected with the output negative pole of POE network interface and the output cathode of low-tension supply port and output negative pole respectively, the input positive pole of described power supply chip is connected with the output cathode of the output cathode of POE network interface and low-tension supply port, the input negative pole of described power supply chip and the output negative pole of low-tension supply port, this lightning protection circuit comprises and has forward conduction and the circuit unit of reverse cutoff function, first lightning protection component, second lightning protection component and the 3rd lightning protection component, wherein:
Described have forward conduction and oppositely the positive pole of the circuit unit of cutoff function connects the output negative pole of described POE network interface; Described have forward conduction and oppositely the negative pole of the circuit unit of cutoff function connects the output negative pole of described low-tension supply port;
Between the output cathode that described first lightning protection component is connected to described POE network interface and output negative pole;
Described second lightning protection component one end connects the input positive pole of low-tension supply port, other end ground connection;
Described 3rd lightning protection component one end connects the input negative pole of low-tension supply port, other end ground connection.
Preferably, described in, there is forward conduction and oppositely the circuit unit of cutoff function is at least one diode.
Preferably, described there is forward conduction and oppositely the circuit unit of cutoff function is made up of two or more diode time, described in formation, there is forward conduction and parallel connection between the diode of the circuit unit of reverse cutoff function, or, described in formation, there is forward conduction and connect between the diode of the circuit unit of reverse cutoff function.
Preferably, described POE network interface comprises at least one diode rectifier bridge, the output cathode of described POE network interface is the output cathode of at least one diode rectifier bridge described, and the output negative pole of described POE network interface is the output negative pole of at least one diode rectifier bridge described.
Preferably, described low-tension supply port comprises the diode that diode rectifier bridge is connected with the output negative pole of described diode rectifier bridge with a positive pole, the input positive pole of the just very described diode rectifier bridge of input of described low-tension supply port, the input negative pole of described low-tension supply port is the input negative pole of described diode rectifier bridge, the output cathode of described low-tension supply port is the negative pole of described diode, and the output negative pole of described low-tension supply port is the output negative pole of described diode rectifier bridge.
Preferably, described first lightning protection component is transient state power supply killer tube TVS or piezo-resistance.
Preferably, described second lightning protection component and the 3rd lightning protection component are respectively the wherein one in gas discharge tube, piezo-resistance and TVS.
Preferably, this port circuit comprises above-described arbitrary lightning protection circuit.
The beneficial effect of the utility model embodiment is as follows:
In the utility model embodiment, PD chip with there is forward conduction and oppositely the circuit unit of cutoff function is in parallel, when producing big current in circuit, big current can have forward conduction and oppositely the circuit unit of cutoff function passes through from parallel with PD chip, thus avoid big current and make PD wafer damage through PD chip, ensure that circuit normally works.
Further, the diode using two or more parallel with one another is in parallel with PD chip, because each diode has the maximum current that can bear, and can bear larger electric current after multiple diodes in parallel, improve the ability of diode antisurge.
Accompanying drawing explanation
Fig. 1 is the lightning protection circuit in prior art in a kind of electric power system;
Fig. 2 is the lightning protection circuit in the circuit port of a kind of electric power system in the utility model embodiment;
Fig. 3 is the lightning protection circuit in the circuit port of another kind of electric power system in the utility model embodiment.
Embodiment
Below in conjunction with drawings and Examples, the port circuit of a kind of electric power system that the utility model provides and lightning protection circuit thereof are illustrated in greater detail.
As shown in Figure 2, the utility model embodiment provides the lightning protection circuit in a kind of port circuit of electric power system, this electric power system comprises POE network interface, low-tension supply port, the power supply chip that POE network interface and low-tension supply port share, PD chip and lightning protection circuit, PD chip is connected with the output negative pole of POE network interface and the output cathode of low-tension supply port and output negative pole respectively, the input positive pole of power supply chip is connected with the output cathode of the output cathode of POE network interface and low-tension supply port, the input negative pole of power supply chip and the output negative pole of low-tension supply port, this lightning protection circuit comprises and has forward conduction and the circuit unit of reverse cutoff function, first lightning protection component, second lightning protection component and the 3rd lightning protection component, wherein:
There is forward conduction and oppositely the positive pole of the circuit unit of cutoff function connects the output negative pole of described POE network interface; There is forward conduction and the output negative pole of the negative pole connection low-tension supply port of the circuit unit of reverse cutoff function; Between the output cathode that first lightning protection component is connected to POE network interface and output negative pole;
Second lightning protection component one end connects the input positive pole of low-tension supply port, other end ground connection;
3rd lightning protection component one end connects the input negative pole of low-tension supply port, other end ground connection.
Wherein, have forward conduction and oppositely the operating voltage of the circuit unit of cutoff function is less than the carrying voltage of PD chip, reverse cut-ff voltage need higher than the ceiling voltage in system.
Wherein, the clamp voltage of the first lightning protection component is less than the carrying voltage of power supply chip and PD chip.
In the utility model embodiment, PD chip with there is forward conduction and oppositely the circuit unit of cutoff function is in parallel, when producing big current in circuit, big current can have forward conduction and oppositely the circuit unit of cutoff function passes through from parallel with PD chip, thus avoid big current and make PD wafer damage through PD chip, ensure that circuit normally works.
Preferably, in above-described embodiment, having forward conduction and oppositely the circuit unit of cutoff function has multiple, can be individual devices, the circuit unit that also can be made up of multiple device.
Preferably, there is forward conduction and oppositely the circuit unit of cutoff function is at least one diode (Diode, D).The leakage current of diode is little and the immediate current amount that can bear large, can ensure that power work is unaffected, by higher thunder-strike current.
Preferably, there is forward conduction and oppositely the circuit unit of cutoff function is made up of two or more diode time, form and there is forward conduction and in parallel between the diode of the reverse circuit unit of cutoff function.The diode using two or more parallel with one another is in parallel with PD chip, because each diode has the maximum current that can bear, and can bear larger electric current after multiple diodes in parallel, improve the ability of diode antisurge.Or, form this and there is forward conduction and connect between the diode of the circuit unit of reverse cutoff function.
Preferably, the POE network interface in above-mentioned electric power system comprises at least one diode rectifier bridge, and the output cathode of POE network interface is the output cathode of at least one diode rectifier bridge, and the output negative pole of POE network interface is the output negative pole of at least one diode rectifier bridge.
Preferably, low-tension supply port in above-mentioned electric power system comprises the diode that diode rectifier bridge is connected with the output negative pole of this diode rectifier bridge with a positive pole, the input positive pole of the input of low-tension supply port just very this diode rectifier bridge, the input negative pole of low-tension supply port is the input negative pole of this diode rectifier bridge, the output cathode of low-tension supply port is the negative pole of this diode, and the input negative pole of low-tension supply port is the input negative pole of diode rectifier bridge.
Preferably, in above all embodiments, the kind of the first lightning protection component has multiple, and preferably, the first lightning protection component is transient state power supply killer tube TVS or piezo-resistance.
Preferably, in above all embodiments, the second lightning protection component and the 3rd lightning protection component are respectively the wherein one in gas discharge tube, piezo-resistance and TVS.
Below for concrete POE network port circuit and low-tension supply port circuit, the lightning protection circuit in a kind of electric power system provide the utility model embodiment illustrates in further detail.
As shown in Figure 3, for POE and low-tension supply share the electric power system of a power supply chip.This electric power system comprises power supply chip, PD chip, POE network port circuit, low-tension supply port circuit, the first lightning protection component TVS1, the second lightning protection component RV1, the 3rd lightning protection component RV2, and diode (Diode, D) 14.Wherein, low-tension supply port circuit comprises: diode D13, and the diode rectifier bridge of the low-tension supply port of D1, D2, D3 and D4 composition.POE network port circuit comprises: POE network interface input, network transformer, the first diode rectifier bridge of the POE network interface of diode D5, D6, D7 and D8 composition, and the second diode rectifier bridge of the POE network interface of diode D9, D10, D11 and D12 composition.D13 is the conjunction road diode of low-tension supply and POE.D14 above-mentionedly has forward conduction and the circuit unit of reverse cutoff function, and its operating voltage is less than the carrying voltage of PD chip, and reverse cut-ff voltage need higher than the ceiling voltage in system.
In the utility model embodiment, the annexation of each circuit element is as follows:
8 transmission lines of POE network interface input are connected with network transformer, wherein two centre caps of network transformer are connected to the input positive pole of the first diode rectifier bridge of POE network interface and input negative pole, and two other centre cap of network transformer is connected to input positive pole and the input negative pole of the second diode rectifier bridge of POE network interface.The output cathode of the first diode rectifier bridge of POE network interface is connected with the output cathode of the second diode rectifier bridge, forms the output cathode of the diode rectifier bridge of POE network interface, i.e. the output cathode of POE network interface.The output negative pole of the first diode rectifier bridge of POE network interface is connected with the output negative pole of the second diode rectifier bridge, forms the output negative pole of POE network interface diode rectifier bridge, i.e. the output negative pole of POE network interface.
The positive pole of diode rectifier bridge and D13, D13 that low-tension supply port circuit comprises the port of low-tension supply connects the output cathode of the diode rectifier bridge of low-tension supply port.The input positive pole of this diode rectifier bridge and input negative pole are input positive pole and the input negative pole of low-tension supply port, and the negative pole of D13 is the output cathode of low-tension supply port, and the output negative pole of this diode rectifier bridge is the output negative pole of low-tension supply port.
PD chip connects the output cathode of the diode rectifier bridge of POE network interface, the output negative pole of diode rectifier bridge of low-tension supply port and the negative pole of D13 respectively.
The input positive pole of power supply chip connects the output cathode of diode rectifier bridge and the negative pole of D13 of POE network interface, and the input negative pole of power supply chip connects output negative pole and the PD chip of the diode rectifier bridge of low-tension supply port.
Between the output cathode that TVS is connected to the diode rectifier bridge of POE network interface and output negative pole, for ensureing the normal work of power supply chip, the clamp voltage of TVS is less than the carrying voltage of power supply chip and PD chip;
The positive pole of D14 connects the output negative pole of the diode rectifier bridge of POE network interface, and the negative pole of D14 connects the output negative pole of the diode rectifier bridge of low-tension supply.
RV1 one end connects the input positive pole of the diode rectifier bridge of low-tension supply port, other end ground connection.
RV2 one end connects the input negative pole of the diode rectifier bridge of low-tension supply port, other end ground connection.
In the utility model embodiment, network at four centre caps of network transformer after two diode rectifier bridges, TVS is connected at the output two ends of diode rectifier bridge, in order to suppress network interface non-differential to the differential mode surge between any two lines, and can by common mode forward surge by this TVS, D14, D2, D4, RV1 and RV2; By common mode negative sense surge by this TVS, D13, D1, D3, RV1 and RV2.
Based on same design, the utility model embodiment also provides a kind of port circuit of electric power system, and this port circuit comprises above arbitrary described lightning protection circuit.
Although described preferred embodiment of the present utility model, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the utility model scope.
Obviously, those skilled in the art can carry out various change and modification to the utility model and not depart from spirit and scope of the present utility model.Like this, if these amendments of the present utility model and modification belong within the scope of the utility model claim and equivalent technologies thereof, then the utility model is also intended to comprise these change and modification.
Claims (8)
1. the lightning protection circuit in the port circuit of an electric power system, this electric power system comprises Power over Ethernet POE network interface, low-tension supply port, the power supply chip that POE network interface and low-tension supply port share, photodiode PD chip and lightning protection circuit, described PD chip is connected with the output negative pole of POE network interface and the output cathode of low-tension supply port and output negative pole respectively, the input positive pole of described power supply chip is connected with the output cathode of the output cathode of POE network interface and low-tension supply port, the input negative pole of described power supply chip and the output negative pole of low-tension supply port, it is characterized in that, this lightning protection circuit comprises and has forward conduction and the circuit unit of reverse cutoff function, first lightning protection component, second lightning protection component and the 3rd lightning protection component, wherein:
Described have forward conduction and oppositely the positive pole of the circuit unit of cutoff function connects the output negative pole of described POE network interface; Described have forward conduction and oppositely the negative pole of the circuit unit of cutoff function connects the output negative pole of described low-tension supply port;
Between the output cathode that described first lightning protection component is connected to described POE network interface and output negative pole;
Described second lightning protection component one end connects the input positive pole of low-tension supply port, other end ground connection;
Described 3rd lightning protection component one end connects the input negative pole of low-tension supply port, other end ground connection.
2. circuit according to claim 1, is characterized in that, described in there is forward conduction and oppositely the circuit unit of cutoff function is at least one diode.
3. circuit according to claim 2, it is characterized in that, described there is forward conduction and oppositely the circuit unit of cutoff function is made up of two or more diode time, described in formation, there is forward conduction and parallel connection between the diode of the circuit unit of reverse cutoff function, or, described in formation, there is forward conduction and connect between the diode of the circuit unit of reverse cutoff function.
4. circuit according to claim 1, it is characterized in that, described POE network interface comprises at least one diode rectifier bridge, the output cathode of described POE network interface is the output cathode of at least one diode rectifier bridge described, and the output negative pole of described POE network interface is the output negative pole of at least one diode rectifier bridge described.
5. circuit according to claim 1, it is characterized in that, described low-tension supply port comprises the diode that diode rectifier bridge is connected with the output negative pole of described diode rectifier bridge with a positive pole, the input positive pole of the just very described diode rectifier bridge of input of described low-tension supply port, the input negative pole of described low-tension supply port is the input negative pole of described diode rectifier bridge, the output cathode of described low-tension supply port is the negative pole of described diode, and the output negative pole of described low-tension supply port is the output negative pole of described diode rectifier bridge.
6. the circuit according to any one of Claims 1 to 5, is characterized in that, described first lightning protection component is transient state power supply killer tube TVS or piezo-resistance.
7. the circuit according to any one of Claims 1 to 5, is characterized in that, described second lightning protection component and the 3rd lightning protection component are respectively the wherein one in gas discharge tube, piezo-resistance and TVS.
8. a port circuit for electric power system, is characterized in that, this port circuit comprises the lightning protection circuit described in any one of claim 1 ~ 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520161118.2U CN204424888U (en) | 2015-03-20 | 2015-03-20 | A kind of port circuit of electric power system and lightning protection circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520161118.2U CN204424888U (en) | 2015-03-20 | 2015-03-20 | A kind of port circuit of electric power system and lightning protection circuit thereof |
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| CN204424888U true CN204424888U (en) | 2015-06-24 |
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| CN201520161118.2U Expired - Fee Related CN204424888U (en) | 2015-03-20 | 2015-03-20 | A kind of port circuit of electric power system and lightning protection circuit thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109274083A (en) * | 2018-10-08 | 2019-01-25 | 深圳市三旺通信技术有限公司 | A kind of POE interface surge protection circuit |
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2015
- 2015-03-20 CN CN201520161118.2U patent/CN204424888U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109274083A (en) * | 2018-10-08 | 2019-01-25 | 深圳市三旺通信技术有限公司 | A kind of POE interface surge protection circuit |
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Granted publication date: 20150624 Termination date: 20210320 |