CN204167896U - There is the ciphering type telemetering terminal of overvoltage protection - Google Patents
There is the ciphering type telemetering terminal of overvoltage protection Download PDFInfo
- Publication number
- CN204167896U CN204167896U CN201420630159.7U CN201420630159U CN204167896U CN 204167896 U CN204167896 U CN 204167896U CN 201420630159 U CN201420630159 U CN 201420630159U CN 204167896 U CN204167896 U CN 204167896U
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- resistance
- telemetering terminal
- ciphering type
- overvoltage protection
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Abstract
The utility model discloses a kind of ciphering type telemetering terminal with overvoltage protection, comprise control element and encryption devices, described control element and encryption element are all connected with overvoltage crowbar, described overvoltage crowbar comprises piezo-resistance VDR, the two ends of described piezo-resistance VDR are connected on two inputs of AC/DC change-over circuit respectively by thermistor NTC and resistance R1, Transient Suppression Diode TVS is connected with between two outputs of described AC/DC change-over circuit, one output of described AC/DC change-over circuit is also connected with resistance R2, it has over-voltage protecting function, effectively can ensure the normal operation of ciphering type telemetering terminal internal electronic component and not be subject to the impact that line voltage raises.
Description
Technical field
The utility model relates to telemetering terminal field, particularly, relates to a kind of ciphering type telemetering terminal with overvoltage protection.
Background technology
Socioeconomic development, natural environment is damaged more and more serious, makes the generation of natural calamity more and more frequent.Natural calamity serious all the more, the especially big mud-stone flow disaster in Zhoushan, landslide event, Wenchuan earthquake etc., it brings serious loss to people's life and property.Local government and country all attach great importance to hazard prediction, and it can not only make prevention in advance, reduce economic loss, also can avoid the injures and deaths of personnel, reduce follow-up rescue method.
Existing disaster telemetry terminal system, it gathers the data of each monitoring point and sends to the Surveillance center of far-end, and Surveillance center carries out analysis according to the data gathered to disaster and judges, to realize remote measurement.In order to further ensure the fail safe of transfer of data, avoiding stealing in data transfer procedure, before data transmit, utilizing encryption devices to be encrypted data.Encryption devices is chip, identically with the control element of disaster telemetry terminal system all needs supply line voltage.But because encryption devices and control element are chip, be the pith of ciphering type telemetering terminal, and its power interface is important external interface, the safety and stability of power supply is related to the security of operation stable problem of whole ciphering type telemetering terminal.Ciphering type telemetering terminal is arranged on field, directly utilize ac power supply, there is the situation of spread of voltage in it, sometimes line voltage is too high, namely direct ciphering type telemetering terminal to be powered, very easily the control element of ciphering type telemetering terminal and encryption devices are damaged during overtension, its operation is affected.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of ciphering type telemetering terminal with overvoltage protection; it has over-voltage protecting function, effectively can ensure the normal operation of ciphering type telemetering terminal internal electronic component and not be subject to the impact that line voltage raises.
The technical scheme in the invention for solving the above technical problem is:
There is the ciphering type telemetering terminal of overvoltage protection; comprise control element and encryption devices; described control element and encryption element are all connected with overvoltage crowbar; described overvoltage crowbar comprises piezo-resistance VDR; the two ends of described piezo-resistance VDR are connected on two inputs of AC/DC change-over circuit respectively by thermistor NTC and resistance R1; be connected with Transient Suppression Diode TVS between two outputs of described AC/DC change-over circuit, an output of described AC/DC change-over circuit is also connected with resistance R2.
As preferably, the common port of described piezo-resistance VDR and thermistor NTC is connected with fuse F, the other end of described fuse is connected on power input.
Further, described fuse F is fast fusibleness fuse.
As preferably, the Standard resistance range of described resistance R1 is 5 kilohms to 15 kilohms.
As preferably, the Standard resistance range of described resistance R1 is 500 ohm to one kilohm.
To sum up, the beneficial effects of the utility model are:
1, the utility model is connected overvoltage crowbar on the power port of control element with encryption devices, when line voltage is too high, can protecting control element and encryption devices from the impact of peak voltage, ciphering type telemetering terminal is normally run.
2, overvoltage crowbar of the present utility model mainly utilizes the characteristic of piezo-resistance VDR to realize overvoltage protection, and its circuit structure is simple, is easy to realize; And utilize Transient Suppression Diode TVS absorb residual amount of energy and release, improve the reliability to overvoltage protection.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of overvoltage crowbar of the present utility model.
Embodiment
Below in conjunction with embodiment and accompanying drawing, to the detailed description further of the utility model do, but execution mode of the present utility model is not limited thereto.
Embodiment 1:
A kind of ciphering type telemetering terminal with overvoltage protection as shown in Figure 1; comprise control element and encryption devices; described control element and encryption element are all connected with overvoltage crowbar; described overvoltage crowbar comprises piezo-resistance VDR; the two ends of described piezo-resistance VDR are connected on two inputs of AC/DC change-over circuit respectively by thermistor NTC and resistance R1; be connected with Transient Suppression Diode TVS between two outputs of described AC/DC change-over circuit, an output of described AC/DC change-over circuit is also connected with resistance R2.
Piezo-resistance VDR is a kind of voltage properties resistor with electric current and voltage symmetry characteristic; it has very high impedance when normality; thus can not circuit characteristic be changed; when line voltage moment too high exceed its puncture voltage time; impedance step-down; cause short circuit, namely follow-up circuit and control element and encryption devices are protected.In the present embodiment, the two ends of piezo-resistance VDR and power input, the two ends of Transient Suppression Diode TVS and voltage output end, it is directly powered to the power supply supply side of control element and encryption devices.Piezo-resistance VDR is accessed power input, works as overtension, piezo-resistance VDR moment puncture short, absorbs overvoltage and releases, and can prevent when normal operation because moment surge disturbs the fault of subsequent conditioning circuit or the electronic devices and components caused.Thermistor NTC resistance value reduces with the rising of temperature, and it is connected in power-supply circuit, prevents because of the destruction of causing instantaneously that is energized.The AC power of civil power is converted to by AC/DC change-over circuit can for the DC power supply of control element and encryption devices; if the front stage circuits of AC/DC change-over circuit has residual amount of energy; then Transient Suppression Diode TVS absorbs residual amount of energy and releases, and better protects control element and the encryption devices of rear class.Resistance R1 and resistance R2 mainly plays current limliting, avoids big current on the impact of electronic devices and components.
Embodiment 2:
A kind of ciphering type telemetering terminal with overvoltage protection as shown in Figure 1, the present embodiment is at the enterprising one-step optimization in the basis of above-described embodiment, namely described piezo-resistance VDR and the common port of thermistor NTC are connected with fuse F, and the other end of described fuse is connected on power input.
Described fuse F is fast fusibleness fuse.
In the present embodiment, power input accesses a fuse F, namely between power input and piezo-resistance VDR, access a fuse, can effectively prevent piezo-resistance VDR to lose efficacy.
Embodiment 3:
A kind of ciphering type telemetering terminal with overvoltage protection as shown in Figure 1, the present embodiment has done refinement on the basis of above-described embodiment, and the Standard resistance range of namely described resistance R1 is 5 kilohms to 15 kilohms.
The Standard resistance range of described resistance R1 is 500 ohm to one kilohm.
In the present embodiment, disclose one group of detailed execution mode, namely resistance R1 and resistance R2 can adopt the resistance of 10 kilohms and 500 ohm respectively.AC/DC change-over circuit is existing very ripe circuit, and its implementation is a lot.
As mentioned above, the utility model can be realized preferably.
Claims (5)
1. there is the ciphering type telemetering terminal of overvoltage protection; comprise control element and encryption devices; it is characterized in that: described control element and encryption element are all connected with overvoltage crowbar; described overvoltage crowbar comprises piezo-resistance VDR; the two ends of described piezo-resistance VDR are connected on two inputs of AC/DC change-over circuit respectively by thermistor NTC and resistance R1; be connected with Transient Suppression Diode TVS between two outputs of described AC/DC change-over circuit, an output of described AC/DC change-over circuit is also connected with resistance R2.
2. the ciphering type telemetering terminal with overvoltage protection according to claim 1, it is characterized in that: the common port of described piezo-resistance VDR and thermistor NTC is connected with fuse F, the other end of described fuse is connected on power input.
3. the ciphering type telemetering terminal with overvoltage protection according to claim 2, is characterized in that: described fuse F is fast fusibleness fuse.
4. the ciphering type telemetering terminal with overvoltage protection according to claim 1, is characterized in that: the Standard resistance range of described resistance R1 is 5 kilohms to 15 kilohms.
5. the ciphering type telemetering terminal with overvoltage protection according to claim 1, is characterized in that: the Standard resistance range of described resistance R1 is 500 ohm to one kilohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420630159.7U CN204167896U (en) | 2014-10-29 | 2014-10-29 | There is the ciphering type telemetering terminal of overvoltage protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420630159.7U CN204167896U (en) | 2014-10-29 | 2014-10-29 | There is the ciphering type telemetering terminal of overvoltage protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204167896U true CN204167896U (en) | 2015-02-18 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420630159.7U Expired - Fee Related CN204167896U (en) | 2014-10-29 | 2014-10-29 | There is the ciphering type telemetering terminal of overvoltage protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204167896U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104319754A (en) * | 2014-10-29 | 2015-01-28 | 成都汉康信息产业有限公司 | Overvoltage protective type encryption remote measuring terminal |
-
2014
- 2014-10-29 CN CN201420630159.7U patent/CN204167896U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104319754A (en) * | 2014-10-29 | 2015-01-28 | 成都汉康信息产业有限公司 | Overvoltage protective type encryption remote measuring terminal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150218 Termination date: 20171029 |