CN104503525A - Voltage attenuation conditioning circuit insusceptible to interference - Google Patents
Voltage attenuation conditioning circuit insusceptible to interference Download PDFInfo
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- CN104503525A CN104503525A CN201410661165.3A CN201410661165A CN104503525A CN 104503525 A CN104503525 A CN 104503525A CN 201410661165 A CN201410661165 A CN 201410661165A CN 104503525 A CN104503525 A CN 104503525A
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Abstract
The invention discloses a voltage attenuation conditioning circuit insusceptible to interference. The voltage attenuation conditioning circuit comprises an operational amplifier A, a resistor R1, a resistor R2, a resistor R3 and a capacitor C; one end of the resistor R1 is connected with a pressure sensor, and the other end of the resistor R1 is connected with the co-directional input end of the operational amplifier A; the reverse input end of the operational amplifier A is connected to the output end of the operational amplifier A; the output end of the operational amplifier A is connected with the resistor R2 and an analog-digital converter in sequence; the operational amplifier A is connected with a 5V power supply; one end of the resistor R3 is connected with the resistor R2 and the common end of the analog-digital converter; the other end of the resistor R3 is connected with the ground end of the operational amplifier A; two ends of the resistor R3 are further connected with the capacitor C in parallel. According to the principle above, input impedance is increased to counteract output impedance of the pressure sensor, a divider resistance is connected to the output of the operational amplifier in parallel, stable voltage is output with few devices, and measuring results are more accurate.
Description
Technical field
The present invention relates to sea water advanced fields of measurement modulate circuit, be specifically related to the voltage attenuation type modulate circuit be not easily disturbed.
Background technology
The degree of depth of ocean is an important parameter of ocean water body.Know the degree of depth of ocean, the beaching that just can prevent sea from navigating by water, to hit a submerged reef.Submarine is when seabed is movable, and it is searched to avoid that the Measuring Oceanic degree of depth can utilize submarine topography to make barrier, the noise that the signal reception instrument of the other side can be made to can not receive submarine send.It can thus be appreciated that the degree of depth measuring seawater is extremely important.Need to use pressure transducer in seawater measuring process, and be 2.5v for the reference voltage measured used by sea water advanced device other electron component, and the output voltage of pressure transducer is greater than reference voltage.Thus must decay to pressure transducer output voltage, to reach the coupling with reference voltage.Realizing the simplest method of this function is directly carry out dividing potential drop with two resistance, but because sensor has certain output impedance, direct coupling divider resistance is equivalent to sensor output impedance and this two resistor coupled in parallel, and the sampled voltage of input A/D can be caused inaccurate.Make to measure sea water advanced device output voltage comparatively large with temperature fluctuation, affect the accuracy of measurement result.
Summary of the invention
Instant invention overcomes the deficiencies in the prior art, the voltage attenuation type be not easily disturbed modulate circuit is provided, by increasing input impedance, offset with pressure transducer output impedance, again at the output stage of amplifier divider resistance in parallel, utilize less device, realize the voltage of stable output, measurement result is more accurate.
For solving above-mentioned technical matters, the present invention is by the following technical solutions: the voltage attenuation type modulate circuit be not easily disturbed, comprise operational amplifier A, resistance R1, resistance R2, resistance R3 and electric capacity C, described resistance R1 one end Bonding pressure sensor, the input end in the same way of other end concatenation operation amplifier A; The output terminal of the reverse input end concatenation operation amplifier A of described operational amplifier A, at output terminal also contact resistance R2 and the analog-digital converter successively of operational amplifier A, operational amplifier A also connects 5V power supply; The common port of described resistance R3 one end contact resistance R2 and analog-digital converter, the earth terminal of the other end concatenation operation amplifier A of resistance R3, the also shunt capacitance C at the two ends of resistance R3.One-level operational amplifier A is added after pressure transducer institute connecting resistance R1 exports, the reverse input end of operational amplifier A is allowed to be connected with output terminal, form a voltage follower, realize input impedance high, output impedance is low, thus offset with pressure transducer output impedance, then after the output stage of amplifier divider resistance in parallel, to realize stable output signal after voltage attenuation and sea water advanced equipment use is measured in supply after being treated to digital signal by analog to digital converter.This circuit to arrange output voltage more stable, not easily fluctuate, and reduce the number of device, reduce and account for plate area.
Described operational amplifier A is single supply rail-to-rail input/output operation amplifier, and model is OPA340.The operating voltage of OPA340 can be low to moderate 2.5V, and its minimum of permission is input as-500mV, and the highest being input as can higher than power supply 500mV, and amplification effect is better.
The resistance of described resistance R1 and resistance R2 is equal.
The resistance of described resistance R3 is 9/10 times of resistance R2 resistance.The impedance that further reduction pressure transducer exports, on the impact of circuit, exports more stable voltage.
Compared with prior art, the invention has the beneficial effects as follows:
1, after pressure transducer institute connecting resistance R1 exports, one-level operational amplifier A is added, allow the reverse input end of operational amplifier A be connected with output terminal, form a voltage follower, realize input impedance high, output impedance is low, thus offset with pressure transducer output impedance, then after the output stage of amplifier divider resistance in parallel voltage, realize the decay of voltage, make output voltage more stable, not easily fluctuate, and reduce the number of device, reduce and account for plate area.
2, operational amplifier A is single supply rail-to-rail input/output operation amplifier, and model is OPA340, and amplification effect is better.
3, the resistance of resistance R3 is 9/10 times of resistance R2 resistance, and the impedance reducing pressure transducer output further, on the impact of circuit, exports more stable voltage.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further elaborated, and embodiments of the invention are not limited thereto.
Embodiment 1:
As shown in Figure 1, the present invention includes operational amplifier A, resistance R1 size is 10 kilo-ohms, resistance R2 size is 10 kilo-ohms, resistance R3 be 9 kilo-ohms and electric capacity C is 1000 pico farads, described resistance R1 one end Bonding pressure sensor, the input end in the same way of other end concatenation operation amplifier A; The output terminal of the reverse input end concatenation operation amplifier A of described operational amplifier A, at output terminal also contact resistance R2 and the analog-digital converter successively of operational amplifier A, operational amplifier A also connects 5V power supply; The common port of described resistance R3 one end contact resistance R2 and analog-digital converter, the earth terminal of the other end concatenation operation amplifier A of resistance R3, the also shunt capacitance C at the two ends of resistance R3.
Pressure transducer is by outside supply power, one-level operational amplifier A is added after pressure transducer institute connecting resistance R1 exports, the reverse input end of operational amplifier A is allowed to be connected with output terminal, form a voltage follower, realize input impedance high, output impedance is low, thus offset with pressure transducer output impedance, again after the output stage of amplifier divider resistance R3 in parallel, output voltage becomes the voltage at parallel resistance R2 and resistance R3 two ends, realize the decay of voltage, after finally decaying, voltage exports, and this voltage stabilization not easily produces fluctuation, after being treated to digital signal finally by analog to digital converter, sea water advanced equipment use is measured in supply.This circuit to arrange output voltage more stable, not easily fluctuate, and reduce the number of device, reduce and account for plate area.
Embodiment 2:
The present embodiment is preferably as follows on the basis of embodiment 1: operational amplifier A is single supply rail-to-rail input/output operation amplifier, and model is OPA340.The operating voltage of OPA340 can be low to moderate 2.5V, and its minimum of permission is input as-500mV, and the highest being input as can higher than power supply 500mV, and amplification effect is better.
The resistance of described resistance R1 and resistance R2 is equal.
The resistance of described resistance R3 is 9/10 times of resistance R2 resistance.The impedance that further reduction pressure transducer exports, on the impact of circuit, exports more stable voltage.
Just this invention can be realized as mentioned above.
Claims (4)
1. the voltage attenuation type modulate circuit be not easily disturbed, is characterized in that: comprise operational amplifier A, resistance R1, resistance R2, resistance R3 and electric capacity C, described resistance R1 one end Bonding pressure sensor, the input end in the same way of other end concatenation operation amplifier A; The output terminal of the reverse input end concatenation operation amplifier A of described operational amplifier A, at output terminal also contact resistance R2 and the analog-digital converter successively of operational amplifier A, operational amplifier A also connects 5V power supply; The common port of described resistance R3 one end contact resistance R2 and analog-digital converter, the earth terminal of the other end concatenation operation amplifier A of resistance R3, the also shunt capacitance C at the two ends of resistance R3.
2. the voltage attenuation type modulate circuit be not easily disturbed according to claim 1, is characterized in that: described operational amplifier A is single supply rail-to-rail input/output operation amplifier, and model is OPA340.
3. the voltage attenuation type modulate circuit be not easily disturbed according to claim 1, is characterized in that: the resistance of described resistance R1 and resistance R2 is equal.
4. the voltage attenuation type modulate circuit be not easily disturbed according to claim 3, is characterized in that: the resistance of described resistance R3 is 9/10 times of resistance R2 resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410661165.3A CN104503525A (en) | 2014-11-19 | 2014-11-19 | Voltage attenuation conditioning circuit insusceptible to interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410661165.3A CN104503525A (en) | 2014-11-19 | 2014-11-19 | Voltage attenuation conditioning circuit insusceptible to interference |
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| Publication Number | Publication Date |
|---|---|
| CN104503525A true CN104503525A (en) | 2015-04-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410661165.3A Pending CN104503525A (en) | 2014-11-19 | 2014-11-19 | Voltage attenuation conditioning circuit insusceptible to interference |
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Citations (8)
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| CN2694281Y (en) * | 2003-10-30 | 2005-04-20 | 上海宝钢安大电能质量有限公司 | Signal conditioning circuit |
| US20050216102A1 (en) * | 2004-03-24 | 2005-09-29 | Yukihiko Tanizawa | Power supply circuit for physical quantity sensor |
| US20060290425A1 (en) * | 2005-06-23 | 2006-12-28 | Delta Electronics, Inc. | Isolated conversion apparatus for analog signal |
| CN101004438A (en) * | 2006-11-09 | 2007-07-25 | 天津理工大学 | Excitation test system based on virtual instrument |
| CN101047084A (en) * | 2006-07-03 | 2007-10-03 | 浙江中凯电器有限公司 | Control device of intelligent control and protective switch electrical equipment |
| CN202956120U (en) * | 2012-12-06 | 2013-05-29 | 中国人民解放军63963部队 | Single-shafting gyroscope-assembly test-signal conditioning circuit |
| CN103368524A (en) * | 2013-06-17 | 2013-10-23 | 成都荣耀科技有限公司 | Signal conditioning circuit for remote monitoring system of distribution transformer |
| CN204256577U (en) * | 2014-11-19 | 2015-04-08 | 成都嵌智捷科技有限公司 | Voltage attenuation type modulate circuit |
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2014
- 2014-11-19 CN CN201410661165.3A patent/CN104503525A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2694281Y (en) * | 2003-10-30 | 2005-04-20 | 上海宝钢安大电能质量有限公司 | Signal conditioning circuit |
| US20050216102A1 (en) * | 2004-03-24 | 2005-09-29 | Yukihiko Tanizawa | Power supply circuit for physical quantity sensor |
| US20060290425A1 (en) * | 2005-06-23 | 2006-12-28 | Delta Electronics, Inc. | Isolated conversion apparatus for analog signal |
| CN101047084A (en) * | 2006-07-03 | 2007-10-03 | 浙江中凯电器有限公司 | Control device of intelligent control and protective switch electrical equipment |
| CN101004438A (en) * | 2006-11-09 | 2007-07-25 | 天津理工大学 | Excitation test system based on virtual instrument |
| CN202956120U (en) * | 2012-12-06 | 2013-05-29 | 中国人民解放军63963部队 | Single-shafting gyroscope-assembly test-signal conditioning circuit |
| CN103368524A (en) * | 2013-06-17 | 2013-10-23 | 成都荣耀科技有限公司 | Signal conditioning circuit for remote monitoring system of distribution transformer |
| CN204256577U (en) * | 2014-11-19 | 2015-04-08 | 成都嵌智捷科技有限公司 | Voltage attenuation type modulate circuit |
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Application publication date: 20150408 |