CN104320007A - Power supply circuit of remote terminal unit - Google Patents
Power supply circuit of remote terminal unit Download PDFInfo
- Publication number
- CN104320007A CN104320007A CN201410587464.7A CN201410587464A CN104320007A CN 104320007 A CN104320007 A CN 104320007A CN 201410587464 A CN201410587464 A CN 201410587464A CN 104320007 A CN104320007 A CN 104320007A
- Authority
- CN
- China
- Prior art keywords
- circuit
- resistance
- vdr
- power supply
- terminal system
- 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
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/34—Snubber circuits
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- 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
- H02H9/043—Protection of over-voltage protection device by short-circuiting
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/34—Snubber circuits
- H02M1/348—Passive dissipative snubbers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a power supply circuit of a remote terminal unit. The power supply circuit comprises a buffering circuit and an overvoltage protection circuit. The overvoltage protection circuit comprises a voltage dependent resistor (VDR) and a negative temperature coefficient thermistor (NTC). One end of the VDR is connected with the input end of a power supply through a fuse F and is connected with one input end of an AC/DC conversion circuit through the NTC. The other end of the VDR is connected with the other input end of the AC/DC conversion circuit. One output end of the AC/DC conversion circuit is connected with a resistor R2. The buffering circuit comprises a resistor R1 and a capacitor C, wherein the resistor R1 and the capacitor C are connected in series, one non-common terminal of the resistor R1 and the capacitor C is connected with the ground, and the other non-common terminal of the resistor R1 and the capacitor C is connected to the common terminal of the fuse F and the NTC. The power supply circuit has the circuit buffering function and the overvoltage protection function, and electronic components in the remote terminal unit are protected against overvoltage damage.
Description
?
Technical field
The present invention relates to telemetry terminal system device field, more particularly, relate to a kind of power circuit of telemetry terminal system.
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.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of power circuit of telemetry terminal system, and it has circuit buffer and over-voltage protecting function, and the internal electronic component of protection telemetry terminal system does not destroy by overvoltage.
The present invention's adopted technical scheme that solves the problem is:
A kind of power circuit of telemetry terminal system, comprise buffer circuit and overvoltage crowbar, described overvoltage crowbar comprises piezo-resistance VDR and thermistor NTC, one end of described piezo-resistance VDR to be connected with power input by fuse F and this end is connected with an input of AC/DC change-over circuit by thermistor NTC, the other end of piezo-resistance VDR is connected with another input of AC/DC change-over circuit, and an output of described AC/DC change-over circuit is connected with resistance R2; Described buffer circuit comprises resistance R1 and electric capacity C, and described resistance R1 and electric capacity C is in series and a not common end ground connection, and another not common end is connected on the common port of fuse F and thermistor NTC.
As preferably, described overvoltage crowbar also comprises Transient Suppression Diode TVS, and the two ends of described Transient Suppression Diode TVS are connected with two outputs of AC/DC change-over circuit respectively.
Further, described buffer circuit comprises resistance R1 and electric capacity C, and described resistance R1 and electric capacity C is in series and a not common end ground connection, and another not common end is connected on the common port of fuse F and thermistor NTC.
As preferably, the Standard resistance range of described resistance R2 is 500 ohm to one kilohm.
To sum up, the invention has the beneficial effects as follows:
1, power circuit of the present invention is provided with overvoltage crowbar and buffer circuit; when line voltage is too high; buffer circuit cushions impulse current and utilizes overvoltage crowbar absorb overvoltage and release; the internal electronic component of effective protection telemetry terminal system, makes telemetry terminal system normally run.
2, overvoltage crowbar of the present invention mainly utilizes the characteristic of piezo-resistance VDR to realize overvoltage protection, and its reliability is strong, and circuit structure is simple.
3, the present invention utilizes the energy of Transient Suppression Diode TVS to remnants to absorb, and strengthens the reliability of overvoltage protection.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing, to the detailed description further of the present invention's do, but embodiments of the present invention are not limited thereto.
Embodiment 1:
The power circuit of a kind of telemetry terminal system as shown in Figure 1, comprise buffer circuit and overvoltage crowbar, described overvoltage crowbar comprises piezo-resistance VDR and thermistor NTC, one end of described piezo-resistance VDR to be connected with power input by fuse F and this end is connected with an input of AC/DC change-over circuit by thermistor NTC, the other end of piezo-resistance VDR is connected with another input of AC/DC change-over circuit, and an output of described AC/DC change-over circuit is connected with resistance R2; Described buffer circuit comprises resistance R1 and electric capacity C, and described resistance R1 and electric capacity C is in series and a not common end ground connection, and another not common end is connected on the common port of fuse F and thermistor NTC.
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 telemetry terminal system internal electronic component are protected.In the present embodiment, fuse F can effectively prevent piezo-resistance VDR to lose efficacy.Buffer circuit plays prime cushioning effect, plays cushioning effect to electric current.One end of resistance R2 and voltage output end, it is directly powered to the power supply supply side of the electronic devices and components of telemetry terminal system inside.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.Heat sensitive electronic 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 and for the DC power supply of internal electronic component, and can be supplied to subsequent conditioning circuit by AC/DC change-over circuit, and resistance R2 mainly plays current limliting, avoids big current on the impact of electronic devices and components.
Embodiment 2:
The power circuit of a kind of telemetry terminal system as shown in Figure 1; the present embodiment is optimized on the basis of above-described embodiment; namely described overvoltage crowbar also comprises Transient Suppression Diode TVS, and the two ends of described Transient Suppression Diode TVS are connected with two outputs of AC/DC change-over circuit respectively.The present embodiment connects Transient Suppression Diode TVS on the basis of above-described embodiment on two of AC/DC change-over circuit outputs; the resistance to surge shock resistance of Transient Suppression Diode TVS is weaker than piezo-resistance VDR; but its price is relatively cheap; Transient Suppression Diode TVS is utilized to carry out double absorption to residual amount of energy and release; because residual amount of energy is little; it is enough to adopt Transient Suppression Diode TVS, and better the electronic devices and components of protection rear class, improve the reliability of overvoltage protection.
Embodiment 3:
The power circuit of a kind of telemetry terminal system as shown in Figure 1, the present embodiment has done refinement on the basis of above-described embodiment, namely described buffer circuit comprises resistance R1 and electric capacity C, described resistance R1 and electric capacity C is in series and a not common end ground connection, and another not common end is connected on the common port of fuse F and thermistor NTC.
Embodiment 4:
The power circuit of a kind of telemetry terminal system 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 R2 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 one kilohm and 500 ohm respectively.Electric capacity can select the electric capacity of 10 pico farads, and AC/DC change-over circuit is existing very ripe circuit, and its implementation is a lot.
As mentioned above, the present invention can be realized preferably.
Claims (4)
1. the power circuit of a telemetry terminal system; it is characterized in that: comprise buffer circuit and overvoltage crowbar; described overvoltage crowbar comprises piezo-resistance VDR and thermistor NTC; one end of described piezo-resistance VDR to be connected with power input by fuse F and this end is connected with an input of AC/DC change-over circuit by thermistor NTC; the other end of piezo-resistance VDR is connected with another input of AC/DC change-over circuit; one output of described AC/DC change-over circuit is connected with resistance R2, and described buffer circuit is RC buffer circuit.
2. the power circuit of a kind of telemetry terminal system according to claim 1; it is characterized in that: described overvoltage crowbar also comprises Transient Suppression Diode TVS, the two ends of described Transient Suppression Diode TVS are connected with two outputs of AC/DC change-over circuit respectively.
3. the power circuit of a kind of telemetry terminal system according to claim 1 and 2, it is characterized in that: described buffer circuit comprises resistance R1 and electric capacity C, described resistance R1 and electric capacity C is in series and a not common end ground connection, and another not common end is connected on the common port of fuse F and thermistor NTC.
4. the power circuit of a kind of telemetry terminal system according to claim 1, is characterized in that: the Standard resistance range of described resistance R2 is 500 ohm to one kilohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410587464.7A CN104320007A (en) | 2014-10-29 | 2014-10-29 | Power supply circuit of remote terminal unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410587464.7A CN104320007A (en) | 2014-10-29 | 2014-10-29 | Power supply circuit of remote terminal unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104320007A true CN104320007A (en) | 2015-01-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410587464.7A Pending CN104320007A (en) | 2014-10-29 | 2014-10-29 | Power supply circuit of remote terminal unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104320007A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110518562A (en) * | 2019-08-26 | 2019-11-29 | 珠海格力电器股份有限公司 | Surge protection device, electromagnetic heating equipment and surge protection method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130003236A1 (en) * | 2011-06-28 | 2013-01-03 | Hon Hai Precision Industry Co., Ltd. | Power supply circuit |
| CN203014691U (en) * | 2012-12-26 | 2013-06-19 | 泉州豪杰信息科技发展有限公司 | power circuit capable of converting AC to DC |
| CN103248029A (en) * | 2013-05-15 | 2013-08-14 | 成都市宏山科技有限公司 | Surge protector with simple structure |
| CN204168169U (en) * | 2014-10-29 | 2015-02-18 | 成都汉康信息产业有限公司 | The power circuit of telemetry terminal system |
-
2014
- 2014-10-29 CN CN201410587464.7A patent/CN104320007A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130003236A1 (en) * | 2011-06-28 | 2013-01-03 | Hon Hai Precision Industry Co., Ltd. | Power supply circuit |
| CN203014691U (en) * | 2012-12-26 | 2013-06-19 | 泉州豪杰信息科技发展有限公司 | power circuit capable of converting AC to DC |
| CN103248029A (en) * | 2013-05-15 | 2013-08-14 | 成都市宏山科技有限公司 | Surge protector with simple structure |
| CN204168169U (en) * | 2014-10-29 | 2015-02-18 | 成都汉康信息产业有限公司 | The power circuit of telemetry terminal system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110518562A (en) * | 2019-08-26 | 2019-11-29 | 珠海格力电器股份有限公司 | Surge protection device, electromagnetic heating equipment and surge protection method thereof |
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Application publication date: 20150128 |
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