CN2622938Y - High voltage preventive protector for communication line - Google Patents
High voltage preventive protector for communication line Download PDFInfo
- Publication number
- CN2622938Y CN2622938Y CN 03232007 CN03232007U CN2622938Y CN 2622938 Y CN2622938 Y CN 2622938Y CN 03232007 CN03232007 CN 03232007 CN 03232007 U CN03232007 U CN 03232007U CN 2622938 Y CN2622938 Y CN 2622938Y
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- diode
- voltage
- communication line
- high voltage
- positive pole
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Abstract
The utility model relates to a high voltage preventive protector for communication line to protect the communication line to operate safely and reliably. The utility model is characterized in that the resistance connected with the port is a thermistor PTC, while the other end is parallel connected with a negative pole of a diode D<1> and a positive pole of a diode D<2>, and connected with the internal circuit of the communication line, the negative pole of the diode D<2> is reversely connected with a voltage protective element in series, the positive pole of a voltage protective element and the positive pole of the diode D<1> are parallel connected and earthed. Therefore, the utility model has the advantages of reasonable circuit distribution, simple structure, convenient manufacture, low production cost, convenient arrangement and use, wide application range, small signal loss and variation, etc. and can fulfill the requirement of different power capacity, reaction sensitivity, voltage withstanding, etc.
Description
Technical field
The utility model relates to a kind of anti-high voltage protective device, especially relates to a kind of anti-high voltage protective device that is connected to the communication line port, with the protection communication line, makes it to be stablized, safe and reliable operation.
Background technology
Communication line is because the lead-in wire distance is subject to high-voltage electric shock.As thunderbolt, strong induced electricity, is made contact etc. at wrong line in the installation and maintenance.In addition, the general only anti-low pressure of communication line port is 0～5V as RS485, and port voltage exceeds certain limit and promptly causes component wear in the internal circuit, and can't restore.Although some product inside has instantaneous high pressure to absorb circuit, can only absorb instantaneous high pressure, and external high voltage still can be destroyed internal circuit and electronic component etc. when being added in line port for a long time.
Summary of the invention
The utility model mainly is to solve the existing high-voltage electric shock that is subject in the existing communication line, the existing technical problem that can not be for a long time high pressure resistant or the like of fragile internal communication circuit, existing anti-high voltage protective device.
It is comparatively narrow that the utility model also solves the existing existing scope of application of anti-high voltage protective device simultaneously, and circuit is comparatively complicated, the technical problem of grade that stability is not good enough.
Above-mentioned technical problem of the present utility model is mainly solved by following technical proposals: the resistance that joins with described port is thermistor PTC, and its other end also is connected to diode D
1Negative pole and diode D
2Positive pole, and be connected to the internal circuit of communication line, described diode D
2Negative pole oppositely be connected in series voltage protection device, the latter's positive pole and diode D
1Anodal and ground connection.
Wherein, described voltage protection device can be transient voltage inhibition diode TVS; Also can adopt piezo-resistance etc., its magnitude of voltage is decided according to the voltage range upper limit of required protection.For example, its magnitude of voltage of RS485 can be 5V.
As preferably, described diode D
1The positive pole string suppress diode TVS through another voltage
1Positive pole after, its negative pole and voltage suppress diode TVS
2Anodal and ground connection.
It is reasonable to the utlity model has circuit arrangement, simple in structure, easy to make, production cost is lower, and is easy to install, and the scope of application is wider, can make the loss of signal and the characteristics such as less that make a variation, and can satisfy the different capacity capacity, the requirement of reaction sensitivity and aspect such as withstand voltage.
The utility model can prevent effectively that high potential from scurrying into communication line, can be widely applicable for the interface circuit of equipment such as RS485, RS232, communication, phone, network, improves equipment dependability greatly.
Description of drawings
Accompanying drawing 1 is the circuit theory diagrams of a kind of two PORT COM A/B of the present utility model;
Accompanying drawing 2 is that a kind of lower voltage limit of protecting of the present utility model is not the protective circuit schematic diagram of ground level.
Embodiment
Below by embodiment, and in conjunction with the accompanying drawings, the technical solution of the utility model is described in further detail.
Embodiment 1: in circuit as shown in Figure 1, thermistor PTC should satisfy requirements such as certain withstand voltage, reaction sensitivity, resistance value, D
1, D
2Be the diode of at a high speed low junction capacitance, require to have certain power capacity, reaction sensitivity, transient voltage suppresses diode TVS and requires to have the certain power capacity, and its turn-on voltage is fixed according to the voltage of need protection.Because TVS duct ligation electric capacity is bigger, series connection D
2Purpose be to make the two series connection back capacitance less, the shunt capacitance I makes the loss of signal and variation as far as possible little on the circuit.
The protection voltage range can be selected according to occasion, requirement that the utility model patent is used.With the RS485 communication line is example, and normal voltage to earth scope is 0～5V on its line, and the protection voltage range is elected as-0.7-5.7V; communication port is two of A/B; both are identical for physical circuit, all can be: at the described resistance that is connected to the port is thermistor PTC, and its other end also is connected to diode D
1Negative pole and diode D
2Positive pole, and be connected to the internal circuit of communication line, described diode D
2Negative pole serial connection voltage protection device, the latter's positive pole and diode D
1Anodal and ground connection.
External high voltage is divided into following several situation: at the arbitrary end of communication line A/B negative high voltage is arranged over the ground; At the arbitrary end of communication line A/B positive high voltage is arranged over the ground; A has positive high voltage to B between communication line A/B two ends; A has negative high-voltage to B between communication line A/B two ends; Can both play protection to above various these devices of situation.
When the arbitrary end of communication line A/B has negative voltage over the ground, be lower than-during 0.7V, diode D
1Conducting is not less than-0.7V port voltage, high voltage is arranged the outside over the ground at the arbitrary end of communication line A/B, and when being higher than 5.7V, high voltage makes the TVS transient voltage suppress diode and diode D
2(the TVS transient voltage suppresses the diode turn-on voltage value and elects 5V as, diode D in conducting
2The forward conduction magnitude of voltage is 0.7V), make port voltage not be higher than 5.7V, be added on communication port as the applying high voltage long period, make that electric current increases rapidly in the circuit, thermistor PTC action, its resistance value raises, cut off electric current and voltage, make current value be unlikely further rising and cause diode D
1Or diode D
2Or the damage of transient voltage inhibition diode TVS, if external high voltage is removed, it is normal that thermistor recovers, communication is recovery automatically again.
When between communication line A/B two ends high voltage being arranged, as external circuit A end high voltage is arranged, then the A terminal voltage is through A end thermistor PTC → A end diode D
2After → A end transient voltage inhibition diode TVS → ground connection → B end diode D
1→ B end thermistor PTC → B holds outflow.High voltage is arranged then with above-mentioned similar as external circuit B end, make the high voltage between two ends can not influence internal circuit C.When being arranged during high voltage the long period between two ends, also can make thermistor PTC action, its resistance value raises, and cuts off electric current and voltage, can avoid making current value further to raise equally and causes diode D
1Or diode D
2Or transient voltage suppresses the damage of diode TVS; After external high voltage was removed, and thermistor recovers normally, communication can recover automatically.
When communication line was two ends incessantly, its principle was also similar.
This device is mainly used in the port of protection communication line; can select the voltage protection scope arbitrarily; and can anti-high voltage (as the 220V civil power) make contact for a long time; can to the communication line two wires or multi-thread between; the high pressure that reaches between each line and the ground is protected, and can recover normal automatically after eliminating high pressure.
Can change the voltage protection scope by changing component parameters: for example, change TVS transient voltage inhibition diode voltage value and can change the positive voltage upper limit; As protect voltage suitable, the TVS transient voltage suppresses also available other voltage protection devices of diode and replaces, as piezo-resistance.
Embodiment 2: requiring when negative voltage withstand voltage lower limit is not ground level, can be at diode D
1The positive pole string suppress diode TVS through another voltage
1Positive pole after, its negative pole and transient voltage suppress diode TVS
2Anodal and ground connection.Physical circuit is referring to shown in the accompanying drawing 2, and remaining circuit structure or other not exhaustive part can not repeat them here referring to embodiment 1.
In embodiment 1 and embodiment 2, diode D and voltage suppress diode TVS because of being circuit polyphone relation, and the position of the two can be exchanged.
Claims (4)
1. an anti-high voltage protective device that is used for communication line comprises diode and resistance, is arranged on the port of communication line, it is characterized in that the described resistance that is connected to the port is thermistor PTC, and its other end also is connected to diode D
1Negative pole and diode D
2Positive pole, and be connected to the internal circuit of communication line, described diode D
2Negative pole oppositely be connected in series voltage protection device, the latter's positive pole and diode D
1Anodal and ground connection.
2. the anti-high voltage protective device that is used for communication line according to claim 1 is characterized in that described voltage protection device is that transient voltage suppresses diode TVS
1
3. the anti-high voltage protective device that is used for communication line according to claim 1 is characterized in that described voltage protection device is a piezo-resistance.
4. according to claim 1 or the 2 or 3 described anti-high voltage protective devices that are used for communication line, it is characterized in that at described diode D
1The positive pole string suppress diode TVS through another voltage
2Positive pole after, its negative pole and voltage suppress diode TVS
1Anodal and ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03232007 CN2622938Y (en) | 2003-06-05 | 2003-06-05 | High voltage preventive protector for communication line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03232007 CN2622938Y (en) | 2003-06-05 | 2003-06-05 | High voltage preventive protector for communication line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2622938Y true CN2622938Y (en) | 2004-06-30 |
Family
ID=34248450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03232007 Expired - Fee Related CN2622938Y (en) | 2003-06-05 | 2003-06-05 | High voltage preventive protector for communication line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2622938Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101980592A (en) * | 2010-10-08 | 2011-02-23 | 徐州上若智能电器有限公司 | High-voltage integrated protector shell with double connected layers |
| CN102280870A (en) * | 2011-07-19 | 2011-12-14 | 苏州莹琦电子科技有限公司 | Switching circuit board and protection method thereof |
| CN105591354A (en) * | 2014-11-20 | 2016-05-18 | 海信（山东）空调有限公司 | Protective circuit and communication device |
| CN104198864B (en) * | 2014-09-19 | 2017-10-24 | 珠海格力电器股份有限公司 | Device and method for testing reliability of PTC resistor |
| WO2017185847A1 (en) * | 2016-04-28 | 2017-11-02 | 中兴通讯股份有限公司 | Overcurrent and overvoltage protection device and method |
-
2003
- 2003-06-05 CN CN 03232007 patent/CN2622938Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101980592A (en) * | 2010-10-08 | 2011-02-23 | 徐州上若智能电器有限公司 | High-voltage integrated protector shell with double connected layers |
| CN102280870A (en) * | 2011-07-19 | 2011-12-14 | 苏州莹琦电子科技有限公司 | Switching circuit board and protection method thereof |
| CN104198864B (en) * | 2014-09-19 | 2017-10-24 | 珠海格力电器股份有限公司 | Device and method for testing reliability of PTC resistor |
| CN105591354A (en) * | 2014-11-20 | 2016-05-18 | 海信（山东）空调有限公司 | Protective circuit and communication device |
| CN105591354B (en) * | 2014-11-20 | 2018-09-25 | 海信（山东）空调有限公司 | A kind of protection circuit and communication equipment |
| WO2017185847A1 (en) * | 2016-04-28 | 2017-11-02 | 中兴通讯股份有限公司 | Overcurrent and overvoltage protection device and method |
| CN107332221A (en) * | 2016-04-28 | 2017-11-07 | 中兴通讯股份有限公司 | Overcurrent overvoltage protection device and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |