CN202748402U - Anti-interference voltage transducer - Google Patents
Anti-interference voltage transducer Download PDFInfo
- Publication number
- CN202748402U CN202748402U CN2012202653969U CN201220265396U CN202748402U CN 202748402 U CN202748402 U CN 202748402U CN 2012202653969 U CN2012202653969 U CN 2012202653969U CN 201220265396 U CN201220265396 U CN 201220265396U CN 202748402 U CN202748402 U CN 202748402U
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- module
- signal
- zero point
- gain
- gain module
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Abstract
The utility model discloses an anti-interference voltage transducer. The voltage transducer includes a power source module, a zero-point adjustment module and a gain module. According to the problems existing in the voltage transducer in the prior art, the voltage transducer provided by the utility model is characterized in that: in the power source module, a large-capacity capacitor is adopted to filter alternating current signals, then an inductance coil is adopted to perform high-frequency filtering, and finally, filtering and voltage stabilizing are performed on the alternating current signals respectively through capacitors and a three-terminal voltage stabilizer, and the alternating current signals are output into the gain module and the zero-point adjustment module; a signal input pin of an amplifier AD620 in the gain module is electrically connected with filtering capacitors and magnetic beads successively; resistors are adopted between a signal output end in the zero-point adjustment module and the power source module for dividing voltage, and an adjustable resistor is adopted to perform zero-point adjustment; ground wire isolation technique is adopted to design the power ground in the power source module and the signal ground in the gain module. The anti-interference voltage transducer of the utility model has the advantages of simple structure, stable performance and easiness in mass production; and the anti-interference voltage transducer can effectively resist external signal interference.
Description
Technical field
The utility model relates to a kind of transmitter, is specially a kind of anti-interference voltage transmitter.
Background technology
Transmitter is a kind of equipment that physical measurement signal or common electrical signal are converted to the output of standard electric signal or can export in the communications protocol mode.Transmitter is of a great variety, by Function Classification temperature/humidity transmitter, pressure unit, differential pressure transmitter, fluid level transmitter, current transducer, voltage transmitter, electric parameters transducer, flow transmitter, weight transmitter etc. is arranged.Wherein, voltage transmitter is a kind ofly to convert to tested alternating voltage, DC voltage, pulse voltage by linear scaling output dc voltage or DC current and isolate outputting analog signal or the device of digital signal, is widely used in the electric device of the departments such as electric power, post and telecommunications, oil, coal, metallurgy, railway, municipal administration, automatically control and dispatching system.Yet there is following shortcoming in existing voltage transmitter: the power unit ripple coefficient is large; Input end to undesired signal process thoroughly do not cause exporting unstable and output signal incorrect; Adopt designing of signal source negative terminal and power supply negative terminal after signal amplifies commonly, when output terminal has the common-mode signal interference to enter circuit, cause exporting and drift about zero point; Signal input part adopts adjustable resistance to carry out the adjustment at zero point to the dividing potential drop of power supply, causes adjusting zero point rear gain and changes.In sum, can't work during the high frequency interference of traditional voltage transmitter more than being subject to 6MHz.
The utility model content
The purpose of this utility model provides a kind of anti-interference voltage transmitter, causes the problem that can't work when being subject to high frequency interference owing to circuit design is rigorous not with voltage transmitter traditional in the solution prior art.
For achieving the above object, the technical solution adopted in the utility model is:
Anti-interference voltage transmitter, comprise power module, zero point adjusting module and gain module, described power module outputs signal to adjusting module and gain module at zero point, described gain module amplifies output to the sensor signal that receives, adjusting module carried out zero point to gain module and adjusted described zero point, it is characterized in that: adopt first large bulk capacitance that AC signal is carried out filtering in the described power module, adopt again telefault to carry out High frequency filter, finally by cross electric capacity and three terminal regulator carry out filtering, voltage stabilizing export to gain module and zero point adjusting module; Include amplifier AD620 in the described gain module, be electrically connected with successively filter capacitor and magnetic bead on the signal input pin of described amplifier AD620; Signal output part adopts electric resistance partial pressure to power module in the described zero point adjusting module, adopts adjustable resistance to carry out zero point and adjusts; Power supply ground in the described power module and the signal ground in the gain module adopt the ground wire isolation design.
Described anti-interference voltage transmitter is characterized in that: described telefault is selected the less telefault of inductance value.
The beneficial effects of the utility model are:
The problem that the utility model exists for the conventional voltage transmitter, make corresponding rational modification, make the utility model can effectively resist the interference of outer signals, can work during interference more than being subject to 6MHz-12MHz, and the utility model is simple in structure, stable performance is easy to batch production.
Description of drawings
Fig. 1 is theory diagram of the present utility model.
Fig. 2 is a specific embodiment of the present utility model.
Embodiment
As shown in Figure 1, the utility model comprises power module, zero point adjusting module and gain module, power module outputs signal to adjusting module and gain module at zero point, gain module amplifies output to the sensor signal that receives, zero point, adjusting module carried out the adjustment at zero point to gain module, adopt first large bulk capacitance that AC signal is carried out filtering in the power module, adopt again telefault to carry out High frequency filter, finally by cross electric capacity and three terminal regulator carry out filtering, voltage stabilizing export to gain module and zero point adjusting module; Include amplifier AD620 in the gain module, be electrically connected with successively filter capacitor and magnetic bead on the signal input pin of amplifier AD620; Signal output part adopts electric resistance partial pressure to power module in the zero point adjusting module, adopts adjustable resistance to carry out zero point and adjusts; Power supply ground in the power module and the signal ground in the gain module adopt the ground wire isolation design.
Telefault is selected the less telefault of inductance value.
As shown in Figure 2, in the power module by large bulk capacitance C13, inductance T1, three terminal regulator U1 and peripheral circuit consist of filter circuit of pressure-stabilizing, voltage signal after the voltage stabilizing passes through integrated chip LTC7660 and shunt capacitance C14 again, C17, the filtering circuit that C3 consists of is sent to the adjusting module at zero point, zero point, adjusting module was by resistance R 9, R8 and variable resistor RP2 consist of, the voltage gain module is made of amplifier AD620 and peripheral circuit, the REF end of amplifier AD620 is connected with the signal output part of adjusting module at zero point, is connected with capacitor C 4 before the two-way input end of amplifier AD620, C5, the filtering circuit that C6 series connection consists of and being connected on the two input branch roads by resistance R 2, R5 and R3, R6 consists of the magnetic bead filtering circuit.
Claims (2)
1. anti-interference voltage transmitter, comprise power module, zero point adjusting module and gain module, described power module outputs signal to adjusting module and gain module at zero point, described gain module amplifies output to the sensor signal that receives, adjusting module carried out zero point to gain module and adjusted described zero point, it is characterized in that: adopt first large bulk capacitance that AC signal is carried out filtering in the described power module, adopt again telefault to carry out High frequency filter, finally by cross electric capacity and three terminal regulator carry out filtering, voltage stabilizing export to gain module and zero point adjusting module; Include amplifier AD620 in the described gain module, be electrically connected with successively filter capacitor and magnetic bead on the signal input pin of described amplifier AD620; Signal output part adopts electric resistance partial pressure to power module in the described zero point adjusting module, adopts adjustable resistance to carry out zero point and adjusts; Power supply ground in the described power module and the signal ground in the gain module adopt the ground wire isolation design.
2. anti-interference voltage transmitter according to claim 1, it is characterized in that: described telefault is selected the less telefault of inductance value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202653969U CN202748402U (en) | 2012-06-06 | 2012-06-06 | Anti-interference voltage transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202653969U CN202748402U (en) | 2012-06-06 | 2012-06-06 | Anti-interference voltage transducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202748402U true CN202748402U (en) | 2013-02-20 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012202653969U Expired - Fee Related CN202748402U (en) | 2012-06-06 | 2012-06-06 | Anti-interference voltage transducer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202748402U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110672917A (en) * | 2019-11-19 | 2020-01-10 | 宁波中车时代传感技术有限公司 | Small-size voltage sensor circuit |
-
2012
- 2012-06-06 CN CN2012202653969U patent/CN202748402U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110672917A (en) * | 2019-11-19 | 2020-01-10 | 宁波中车时代传感技术有限公司 | Small-size voltage sensor circuit |
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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 |
Granted publication date: 20130220 Termination date: 20150606 |
|
| EXPY | Termination of patent right or utility model |