CN202693002U - Two-wire system transmitter and anti-jamming circuit thereof - Google Patents
Two-wire system transmitter and anti-jamming circuit thereof Download PDFInfo
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- CN202693002U CN202693002U CN 201220275981 CN201220275981U CN202693002U CN 202693002 U CN202693002 U CN 202693002U CN 201220275981 CN201220275981 CN 201220275981 CN 201220275981 U CN201220275981 U CN 201220275981U CN 202693002 U CN202693002 U CN 202693002U
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Abstract
The utility model belongs to the field of industrial process control and particularly relates to a two-wire system transmitter and an anti-jamming circuit thereof. An anti-surge module, a first level wave filter, a second level wave filter and an overvoltage protection module are sequentially comprised by the two-wire system transmitter and the anti-jamming circuit thereof. The two-wire system transmitter and the anti-jamming circuit thereof have the functions of resisting lightning stroke, surge, power interference and the like on a industrial control spot and can obviously improve stability of the two-wire system transmitter.
Description
Technical field
The utility model belongs to the industrial process control field, relates in particular to a kind of two-wire system transducer and anti-jamming circuit thereof.
Background technology
At present, transmitter is widely used in the industrial process control field, and along with the fast development of microelectric technique and sensing technology, the performance index such as the measuring accuracy of transmitter and stability are significantly improved.Yet, the complicacy of industrial environment is the principal element that affects the transmitter performance, therefore, in the performance history of transmitter, must take into full account the impact of various environmental factors, comprising common thunderbolt and power supply interference problem: the voltage surge of responding on the power lead during thunderbolt can directly cause transmitter to damage, and is particularly evident in this problem of thunderbolt prone areas; It is the one of the main reasons that affects transmitter measuring accuracy and stability that power supply disturbs, and is prevalent in various industry spot.
The utility model content
The purpose of this utility model is to provide a kind of anti-jamming circuit for two-wire system transducer, is intended to improve the performance of existing transmitter, reduces the problems such as thunderbolt and power supply interference to the impact of transmitter performance.
In order to achieve the above object, the technical scheme that adopts of the utility model is:
A kind of anti-jamming circuit for two-wire system transducer comprises:
Be connected between the positive power line and negative power line of described two-wire system transducer the Anti-surging module that the formation current returns such as voltage surge of lightning induction are protected;
Link to each other with two output terminals of described Anti-surging module, the signal that described Anti-surging module is exported carries out the first order wave filter that filtering is processed;
Link to each other with two output terminals of described first order wave filter, suppress the second level wave filter of the interchange differential mode interference of described first order filter output signal;
Link to each other with two output terminals of described second level wave filter, absorb the overvoltage protective module of the transient high voltages of surge energy remaining after described Anti-surging resume module and power supply moment break-make generation.
Particularly, described Anti-surging module comprises: gas-discharge tube TU11, gas-discharge tube TU12, gas-discharge tube TU13, voltage dependent resistor (VDR) VDR11, voltage dependent resistor (VDR) VDR12 and voltage dependent resistor (VDR) VDR13; The positive power line of the described two-wire system transducer of the first termination of described voltage dependent resistor (VDR) VDR11, the first end of the described gas-discharge tube TU11 of the second termination of described voltage dependent resistor (VDR) VDR11, the negative power line of the described two-wire system transducer of the first termination of described voltage dependent resistor (VDR) VDR12, the first end of the described gas-discharge tube TU12 of the second termination of described voltage dependent resistor (VDR) VDR12, the second end ground connection of the second end of described gas-discharge tube TU11 and described gas-discharge tube TU12, the positive power line of the described two-wire system transducer of the first termination of described gas-discharge tube TU13, the first output terminal as described Anti-surging module, the first end of the described voltage dependent resistor (VDR) VDR13 of the second termination of described gas-discharge tube TU13, the negative power line of the described two-wire system transducer of the second termination of described voltage dependent resistor (VDR) VDR13, the second output terminal as described Anti-surging module.
Particularly, described first order wave filter comprises: resistance R 21, resistance R 22, capacitor C 21 and capacitor C 22; The first output terminal of the described Anti-surging module of the first termination of described resistance R 21, the second end of described resistance R 21 is the first output terminal of described first order wave filter, the second output terminal of the described Anti-surging module of the first termination of described resistance R 22, the second end of described resistance R 22 is the second output terminal of described first order wave filter, described capacitor C 21 is connected between second end and ground of described resistance R 21, and described capacitor C 22 is connected between second end and ground of described resistance R 22.
Particularly, described second level wave filter comprises: common mode inductance LCM31, capacitor C 31 and capacitor C 32; The first end of described common mode inductance LCM31 coil one and the second end are respectively first input end and first output terminal of described second level wave filter, the first end of described common mode inductance LCM31 coil two and the second end are respectively the second input end and second output terminal of described second level wave filter, described capacitor C 31 is connected between the first input end and the second input end of described second level wave filter, and described capacitor C 32 is connected between first output terminal and the second output terminal of described second level wave filter.
Particularly, described overvoltage protective module comprises a two-way Transient Suppression Diode D41; The first end of described two-way Transient Suppression Diode D41 links to each other with the first output terminal, second output terminal of described second level wave filter respectively with the second end, and the first end of described two-way Transient Suppression Diode D41 and the second end are respectively positive output end and the negative output terminal of described anti-jamming circuit simultaneously.
Another purpose of the present utility model is to provide a kind of two-wire system transducer that comprises above-mentioned anti-jamming circuit, and the kind of this transmitter includes but not limited to pressure unit, temperature transmitter, consistency transmitter, flow transmitter, humidity transmitter, gas transmitter and fluid level transmitter etc.
The anti-jamming circuit that is applicable to two-wire system transducer that the utility model provides; comprise the Anti-surging module, first order wave filter, second level wave filter and overvoltage protective module four parts that connect successively; have lightening surge preventing and anti-power supply interference function, can significantly improve the stability of two-wire system transducer.
Description of drawings
Fig. 1 is the structured flowchart of the anti-jamming circuit that is applicable to two-wire system transducer that provides of the utility model;
Fig. 2 is the exemplary circuit figure of the anti-jamming circuit that is applicable to two-wire system transducer that provides of the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
The anti-jamming circuit that is applicable to two-wire system transducer that the utility model provides; comprise the Anti-surging module, first order wave filter, second level wave filter and overvoltage protective module four parts that connect successively; have the functions such as lightening surge preventing and anti-power supply interference, can significantly improve the stability of two-wire system transducer.
Fig. 1 is the structured flowchart of the anti-jamming circuit that is applicable to two-wire system transducer that provides of the utility model, for convenience of explanation, only shows the part relevant with the utility model, as shown in the figure:
Be applicable to the anti-jamming circuit of two-wire system transducer, comprise the Anti-surging module 10, first order wave filter 20, second level wave filter 30 and the overvoltage protective module 40 that connect successively;
Wherein, Anti-surging module 10 is connected between the positive power line and negative power line of two-wire system transducer, to the formation current returns such as voltage surge of lightning induction to protect;
First order wave filter 20 links to each other with two output terminals of Anti-surging module 10, and the signal that Anti-surging module 10 is exported carries out the filtering processing;
Second level wave filter 30 links to each other with two output terminals of first order wave filter 20, suppresses the interchange differential mode interference of first order filter output signal;
Overvoltage protective module 40 links to each other with two output terminals of second level wave filter 30, absorbs the transient high voltages that surge energy remaining after Anti-surging module 10 is processed and power supply moment break-make produce, and the protection back-end circuit is not damaged.
Fig. 2 is the exemplary circuit figure of the anti-jamming circuit that is applicable to two-wire system transducer that provides of the utility model embodiment, for convenience of explanation, only shows the part relevant with the utility model embodiment.
With reference to Fig. 2, details are as follows to the utility model embodiment:
As an embodiment of the present utility model, Anti-surging module 10 comprises: gas-discharge tube TU11, gas-discharge tube TU12, gas-discharge tube TU13, voltage dependent resistor (VDR) VDR11, voltage dependent resistor (VDR) VDR12 and voltage dependent resistor (VDR) VDR13; The positive power line of the first termination two-wire system transducer of voltage dependent resistor (VDR) VDR11, the first end of the second termination gas-discharge tube TU11 of voltage dependent resistor (VDR) VDR11, the negative power line of the first termination two-wire system transducer of voltage dependent resistor (VDR) VDR12, the first end of the second termination gas-discharge tube TU12 of voltage dependent resistor (VDR) VDR12, the second end ground connection of the second end of gas-discharge tube TU11 and gas-discharge tube TU12, the positive power line of the first termination two-wire system transducer of gas-discharge tube TU13, the first output terminal as Anti-surging module 10, the first end of the second termination voltage dependent resistor (VDR) VDR13 of gas-discharge tube TU13, the negative power line of the second termination two-wire system transducer of voltage dependent resistor (VDR) VDR13, the second output terminal as Anti-surging module 10.
The voltage surge of lightning induction makes gas-discharge tube two pole tensions reach conducting after its voltage breakdown, and the with it also conducting of voltage dependent resistor (VDR) of series connection forms the surge current loop subsequently, and most surge energies are released, thereby the protection internal circuit is not damaged.In the present embodiment, the mode that adopts the series connection of gas-discharge tube and voltage dependent resistor (VDR) be because two-wire system transducer except the output that possesses 4-20mA, the part transmitter is also supported digital communication, namely has the higher AC signal of frequency on the power lead; In addition, also may there be the high frequency interference of being introduced by external power source on the power lead, for reducing the leakage current that AC signal produces between line, requires the stray capacitance between line must be enough little, and the stray capacitance of gas-discharge tube is very little, can effectively reduce the stray capacitance between line after the series connection.On the other hand, because gas-discharge tube is in open-circuit condition at ordinary times, thus can select to hang down the voltage dependent resistor (VDR) of pressure-sensitive voltage, and can not cause leakage current to increase, thus clamped voltage reduced.
As an embodiment of the present utility model, first order wave filter 20 comprises resistance R 21, resistance R 22, capacitor C 21 and capacitor C 22; The first end of resistance R 21 is taken over control the first output terminal of surge module 10, the second end of resistance R 21 is the first output terminal of first order wave filter 20, the first end of resistance R 22 is taken over control the second output terminal of surge module 10, the second end of resistance R 22 is the second output terminal of first order wave filter 20, capacitor C 21 is connected between second end and ground of resistance R 21, and capacitor C 22 is connected between second end and ground of resistance R 22.
First order wave filter 20 is actual to be the RC low-pass filter of anti-common mode interference, according to the actual needs of different transmitters, selects resistance and the electric capacity of different parameters, and the cutoff frequency computing formula of its passband is:
As an embodiment of the present utility model, second level wave filter 30 comprises: common mode inductance LCM31, capacitor C 31 and capacitor C 32; The first end of the coil one of common mode inductance LCM31 and the second end are respectively first input end and first output terminal of second level wave filter 30, the first end of common mode inductance LCM31 coil two and the second end are respectively the second input end and second output terminal of second level wave filter 30, capacitor C 31 is connected between the first input end and the second input end of second level wave filter 30, and capacitor C 32 is connected between first output terminal and the second output terminal of second level wave filter 30.
Second level wave filter 30 is the compound wave filters that possess anti-common mode interference and differential mode interference, but the common mode interference on the common mode inductance LCM31 establishment power lead; In addition, the combination of common mode inductance LCM31 and capacitor C 31, capacitor C 32 can be regarded the pi type filter of two symmetries as, each pi type filter is comprised of one of them coil and two capacitor C 31, C32 of common mode inductance LCM31, the interchange differential mode interference of symmetrical structure between also can two power leads of establishment.
As an embodiment of the present utility model, overvoltage protective module 40 comprises a two-way Transient Suppression Diode D41; The first end of two-way Transient Suppression Diode D41 links to each other with the first output terminal, second output terminal of second level wave filter 30 respectively with the second end, and the first end of two-way Transient Suppression Diode D41 and the second end are respectively positive output end and the negative output terminal of anti-jamming circuit simultaneously.
The overvoltage protective module 40 that is made of two-way Transient Suppression Diode D41 is mainly used in absorbing the surge energy of remnants after Anti-surging module 10 is processed and the transient high voltages that power supply moment break-make produces, and the protection back-end circuit is not damaged.
The anti-jamming circuit that is applicable to two-wire system transducer that the utility model provides; comprise the Anti-surging module, first order wave filter, second level wave filter and overvoltage protective module four parts that connect successively; have in functions such as the on-the-spot lightening surge preventing of Industry Control and anti-power supply interference, can significantly improve the stability of two-wire system transducer.
The utility model embodiment also provides the two-wire system transducer that has comprised above-mentioned anti-jamming circuit, and the kind of this transmitter includes but not limited to pressure unit, temperature transmitter, consistency transmitter, flow transmitter, humidity transmitter, gas transmitter and fluid level transmitter etc.
The above only is preferred embodiment of the present utility model, not in order to limit the utility model, although with reference to previous embodiment the utility model has been carried out more detailed explanation, for a person skilled in the art, it still can be made amendment or part technical characterictic wherein is equal to replacement the technical scheme that aforementioned each embodiment puts down in writing.All any modifications of within spirit of the present utility model and principle, doing, be equal to and replace and improvement etc., all should be included within the protection domain of the present utility model.
Claims (7)
1. an anti-jamming circuit that is used for two-wire system transducer is characterized in that, described anti-jamming circuit comprises:
Be connected between the positive power line and negative power line of described two-wire system transducer the Anti-surging module that the formation current returns such as voltage surge of lightning induction are protected;
Link to each other with two output terminals of described Anti-surging module, the signal that described Anti-surging module is exported carries out the first order wave filter that filtering is processed;
Link to each other with two output terminals of described first order wave filter, suppress the second level wave filter of the interchange differential mode interference of described first order filter output signal;
Link to each other with two output terminals of described second level wave filter, absorb the overvoltage protective module of the transient high voltages of surge energy remaining after described Anti-surging resume module and power supply moment break-make generation.
2. anti-jamming circuit as claimed in claim 1 is characterized in that, described Anti-surging module comprises: gas-discharge tube TU11, gas-discharge tube TU12, gas-discharge tube TU13, voltage dependent resistor (VDR) VDR11, voltage dependent resistor (VDR) VDR12 and voltage dependent resistor (VDR) VDR13;
The positive power line of the described two-wire system transducer of the first termination of described voltage dependent resistor (VDR) VDR11, the first end of the described gas-discharge tube TU11 of the second termination of described voltage dependent resistor (VDR) VDR11, the negative power line of the described two-wire system transducer of the first termination of described voltage dependent resistor (VDR) VDR12, the first end of the described gas-discharge tube TU12 of the second termination of described voltage dependent resistor (VDR) VDR12, the second end ground connection of the second end of described gas-discharge tube TU11 and described gas-discharge tube TU12, the positive power line of the described two-wire system transducer of the first termination of described gas-discharge tube TU13, the first output terminal as described Anti-surging module, the first end of the described voltage dependent resistor (VDR) VDR13 of the second termination of described gas-discharge tube TU13, the negative power line of the described two-wire system transducer of the second termination of described voltage dependent resistor (VDR) VDR13, the second output terminal as described Anti-surging module.
3. anti-jamming circuit as claimed in claim 2 is characterized in that, described first order wave filter comprises: resistance R 21, resistance R 22, capacitor C 21 and capacitor C 22;
The first output terminal of the described Anti-surging module of the first termination of described resistance R 21, the second end of described resistance R 21 is the first output terminal of described first order wave filter, the second output terminal of the described Anti-surging module of the first termination of described resistance R 22, the second end of described resistance R 22 is the second output terminal of described first order wave filter, described capacitor C 21 is connected between second end and ground of described resistance R 21, and described capacitor C 22 is connected between second end and ground of described resistance R 22.
4. anti-jamming circuit as claimed in claim 3 is characterized in that, described second level wave filter comprises: common mode inductance LCM31, capacitor C 31 and capacitor C 32;
The first end of described common mode inductance LCM31 coil one and the second end are respectively first input end and first output terminal of described second level wave filter, the first end of described common mode inductance LCM31 coil two and the second end are respectively the second input end and second output terminal of described second level wave filter, described capacitor C 31 is connected between the first input end and the second input end of described second level wave filter, and described capacitor C 32 is connected between first output terminal and the second output terminal of described second level wave filter.
5. anti-jamming circuit as claimed in claim 4 is characterized in that, described overvoltage protective module comprises a two-way Transient Suppression Diode D41;
The first end of described two-way Transient Suppression Diode D41 links to each other with the first output terminal, second output terminal of described second level wave filter respectively with the second end, and the first end of described two-way Transient Suppression Diode D41 and the second end are respectively positive output end and the negative output terminal of described anti-jamming circuit simultaneously.
6. a two-wire system transducer is characterized in that, described transmitter comprises each described anti-jamming circuit such as claim 1-5.
7. two-wire system transducer as claimed in claim 6 is characterized in that, described transmitter includes but not limited to: pressure unit, temperature transmitter, consistency transmitter, flow transmitter, humidity transmitter, gas transmitter and fluid level transmitter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220275981 CN202693002U (en) | 2012-06-12 | 2012-06-12 | Two-wire system transmitter and anti-jamming circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220275981 CN202693002U (en) | 2012-06-12 | 2012-06-12 | Two-wire system transmitter and anti-jamming circuit thereof |
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| CN202693002U true CN202693002U (en) | 2013-01-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220275981 Expired - Fee Related CN202693002U (en) | 2012-06-12 | 2012-06-12 | Two-wire system transmitter and anti-jamming circuit thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106093494A (en) * | 2016-08-22 | 2016-11-09 | 四方继保（武汉）软件有限公司 | A kind of signal for electronic mutual inductor protects filter circuit |
| CN110350532A (en) * | 2019-07-04 | 2019-10-18 | 深圳振华富电子有限公司 | Three-phase four-wire power filter |
| CN111707408A (en) * | 2020-07-08 | 2020-09-25 | 宁波中车时代传感技术有限公司 | Sputtering film pressure transmitter |
-
2012
- 2012-06-12 CN CN 201220275981 patent/CN202693002U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106093494A (en) * | 2016-08-22 | 2016-11-09 | 四方继保（武汉）软件有限公司 | A kind of signal for electronic mutual inductor protects filter circuit |
| CN110350532A (en) * | 2019-07-04 | 2019-10-18 | 深圳振华富电子有限公司 | Three-phase four-wire power filter |
| CN111707408A (en) * | 2020-07-08 | 2020-09-25 | 宁波中车时代传感技术有限公司 | Sputtering film pressure transmitter |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130123 Termination date: 20210612 |
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| CF01 | Termination of patent right due to non-payment of annual fee |