CN202793425U - Signal sampling circuit of inductive sensor - Google Patents
Signal sampling circuit of inductive sensor Download PDFInfo
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- CN202793425U CN202793425U CN201220431816.6U CN201220431816U CN202793425U CN 202793425 U CN202793425 U CN 202793425U CN 201220431816 U CN201220431816 U CN 201220431816U CN 202793425 U CN202793425 U CN 202793425U
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- sample circuit
- type transducer
- inductance type
- signal sample
- amplifier
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Abstract
The utility model provides a signal sampling circuit of an inductive sensor. The signal sampling circuit of the inductive sensor comprises an inductance-capacitance (LC) oscillating unit for generating oscillation frequency and a sinusoidal signal generating unit connected with the LC oscillating unit and used for generating sine wave, and the signal frequency of the generated sine wave changes with the changing of the oscillation frequency. According to the signal sampling circuit of the inductive sensor, the change of a magnetic field is converted to the change of sine wave frequency, the sensitivity is high, simultaneously the entire sampling circuit forms a complete loop, noise waves carried by a main signal are subjected to repeated feedback amplification and filtering, and the signal stability and consistency are good.
Description
Technical field
The utility model relates to the sample circuit technical field, particularly relates to a kind of signal sample circuit of inductance type transducer.
Background technology
Inductance type transducer (Inductance type transducer, ITT) be to utilize electromagnetic induction tested physical quantity such as displacement, pressure, flow, vibration etc. to be converted to the variation of coefficient of self-induction and the coefficient of mutual inductance of coil, be the variable quantity output of voltage or electric current by circuit conversion again, realize that non electrical quantity is to the conversion of electric weight.
The variation with straight line or angular displacement that is made of unshakable in one's determination and coil is converted to the sensor that winding inductance quantity changes, and claims again inductive displacement transducer.The coil turn of this sensor and material magnetic capacity all are certain, and the variation of its inductance value is to cause owing to the displacement input quantity causes the geometrical variations of coil magnetic circuit.When coil being accessed metering circuit and connecting excitation power supply, just can obtain to be proportional to voltage or the electric current output of displacement input quantity.The characteristics of inductance type transducer are: 1. high without armature contact, fiduciary level, the life-span is long; 2. resolution is high; 3. highly sensitive; 4. high, the good reproducibility of the linearity; 5. measurement range wide (resolution was low when measurement range was large); During 6. without input the zero-bit output voltage is arranged, cause measuring error; 7. frequency and the amplitude stability of excitation power supply are had relatively high expectations; 8. be not suitable for the high frequency kinetic measurement.Inductance type transducer is mainly used in displacement measurement and can converts the measurement of the mechanical quantity (such as power, tension force, pressure, pressure reduction, acceleration, vibration, strain, flow, thickness, liquid level, proportion, torque etc.) of change in displacement to.
The effect of the sample circuit of sensor is to receive input voltage in the moment of certain regulation, and keeps this voltage until till sampling beginning next time at output terminal.The existing senser sampling circuit integrated circuit of often sampling, its complex structure, cost is high.
The utility model content
The shortcoming of prior art in view of the above, the purpose of this utility model is to provide a kind of signal sample circuit of inductance type transducer, is used for realizing a kind of highly sensitive senser sampling circuit.
Reach for achieving the above object other relevant purposes, the utility model provides a kind of signal sample circuit of inductance type transducer.
A kind of signal sample circuit of inductance type transducer, the signal sample circuit of described inductance type transducer comprises: in order to produce the LC oscillating unit of oscillation frequency; In parallel with described LC oscillating unit, in order to produce the sine wave generator unit of the sine wave that signal frequency changes with the variation of described oscillation frequency.
Preferably, described LC oscillating unit comprises electric capacity and inductance in parallel.
Preferably, described sine wave generator unit comprises an amplifier U3A, and the inverting input of described amplifier U3A links to each other with an end of described electric capacity, and the output terminal of amplifier U3A links to each other with the other end of described electric capacity.
Preferably, the signal sample circuit of described inductance type transducer also comprises an amplitude limitation unit, and the input end of described amplitude limitation unit links to each other with the output terminal of described sine wave generator unit.
Preferably, described amplitude limitation unit comprises an amplifier U3B, and the inverting input of described amplifier U3B links to each other with the in-phase input end of described amplifier U3A, and the in-phase input end of described amplifier U3B links to each other with the output terminal of described amplifier U3A.
Preferably, the signal sample circuit of described inductance type transducer also comprises a phase compensation unit that links to each other with the output terminal of described amplifier U3B, and described phase compensation unit is electric capacity.
Preferably, the signal sample circuit of described inductance type transducer comprises that also one links to each other with described phase compensation unit, and in order to produce the square wave generation unit of the square wave identical with sine wave freuqency.
Preferably, described square wave generation unit comprises a silicon gate CMOS device U4, and the 1st pin of described silicon gate CMOS device U4 links to each other with described phase compensation unit.
As mentioned above, the signal sample circuit of inductance type transducer described in the utility model has following beneficial effect:
Sample circuit described in the utility model is converted into the variation of sine wave freuqency with the variation in magnetic field, and is highly sensitive; Simultaneously whole sample circuit consists of a complete loop, to main signal with clutter repeatedly feed back amplification, filtering, signal stabilization and high conformity.
Description of drawings
Fig. 1 is shown as the structural representation of the signal sample circuit of inductance type transducer described in the utility model.
Fig. 2 is shown as the circuit theory synoptic diagram of the signal sample circuit of inductance type transducer described in the utility model.
The element numbers explanation
1 LC oscillating unit;
2 sine wave generator unit;
3 amplitude limitation unit;
4 phase compensation units;
5 square wave generation units.
Embodiment
Below by particular specific embodiment embodiment of the present utility model is described, person skilled in the art scholar can understand other advantages of the present utility model and effect easily by the disclosed content of this instructions.
See also accompanying drawing.Notice, the appended graphic structure that illustrates of this instructions, ratio, size etc., equal contents in order to cooperate instructions to disclose only, understand and reading for person skilled in the art scholar, be not to limit the enforceable qualifications of the utility model, so technical essential meaning of tool not, the adjustment of the modification of any structure, the change of proportionate relationship or size, do not affecting under the effect that the utility model can produce and the purpose that can reach, all should still drop on the technology contents that the utility model discloses and get in the scope that can contain.Simultaneously, quote in this instructions as " on ", D score, " left side ", " right side ", " centre " reach the term of " " etc., also only for ease of understanding of narrating, but not in order to limit the enforceable scope of the utility model, the change of its relativeness or adjustment, under without essence change technology contents, when also being considered as the enforceable category of the utility model.
Embodiment
Present embodiment provides a kind of signal sample circuit of inductance type transducer, as shown in Figure 1, the signal sample circuit of described inductance type transducer comprises LC oscillating unit 1, sine wave generator unit 2, amplitude limitation unit 3, phase compensation unit 4, square wave generation unit 5; Wherein, sine wave generator unit 2 is in parallel with described LC oscillating unit 1; The input end of amplitude limitation unit 3 links to each other with the output terminal of described sine wave generator unit 2; One end of phase compensation unit 4 links to each other with the output terminal of described amplitude limitation unit 3, and the other end links to each other with the input end of described square wave generation unit 5.
The below is described respectively unit respectively.
Described LC oscillating unit 1 is in order to produce oscillation frequency.Further, the electric circuit constitute of described LC oscillating unit comprises capacitor C 14 and inductance L 2 in parallel.
The sine wave that described sine wave generator unit 2 changes with the variation of described oscillation frequency in order to produce signal frequency.Further, the electric circuit constitute of described sine wave generator unit comprises an amplifier U3A, the inverting input of described amplifier U3A and described capacitor C 14(or inductance L 2) an end link to each other the output terminal of amplifier U3A and described capacitor C 14(or inductance L 2) the other end link to each other.
The electric circuit constitute of described amplitude limitation unit 3 comprises an amplifier U3B, and the inverting input of described amplifier U3B links to each other with the in-phase input end of described amplifier U3A, and the in-phase input end of described amplifier U3B links to each other with the output terminal of described amplifier U3A.
The electric circuit constitute of described phase compensation unit 4 can be capacitor C 16.
Described square wave generation unit 5 is in order to produce the square wave identical with sine wave freuqency.Further, the electric circuit constitute of described square wave generation unit comprises a silicon gate CMOS device U4, and the 1st pin of described silicon gate CMOS device U4 links to each other with described phase compensation unit.
A kind of the electric circuit constitute mode of the signal sample circuit of described inductance type transducer as shown in Figure 2, wherein, in parallel capacitor C 14 and inductance L 2 have consisted of described LC oscillating unit.Amplifier U3A has consisted of described sine wave generator unit, the inverting input of described amplifier U3A and described capacitor C 14(or inductance L 2) an end link to each other the output terminal of amplifier U3A and described capacitor C 14(or inductance L 2) the other end link to each other.Amplifier U3B has consisted of described amplitude limitation unit, and the inverting input of described amplifier U3B links to each other with the in-phase input end of described amplifier U3A, and the in-phase input end of described amplifier U3B links to each other with the output terminal of described amplifier U3A.Capacitor C 16 has consisted of described phase compensation unit.Silicon gate CMOS device U4 has consisted of described square wave generation unit, and the 1st pin of described silicon gate CMOS device U4 links to each other with described phase compensation unit.
The principle of work of the signal sample circuit of inductance type transducer shown in Figure 2 is:
Silicon gate CMOS device U4 is used for producing square-wave signal.1 pin of U4 is input as the sine wave signal take 2.5V as benchmark, and through the effect of phase inverter among the U4,2,3,4,5,6 pin of U4 are output as square-wave signal.Wherein 2 is identical with 3 signals, and 4 is identical with 5 signal.
L2 is inductive coil, when this coil and metal object magnetic field intensity grow when becoming near.LC frequency selection network computing formula is
When L changed, frequency also changed.The sensitivity response that field intensity is adjusted the distance can make this contactless height sensor highly sensitive.
Amplifier U3A is for producing sinusoidal wave circuit, and when the LC oscillation frequency changed, the sine wave signal Frequency generated of the output terminal of amplifier U3A (1 pin) changed, and this signal is sampled.Amplifier U3B is sinusoidal wave amplitude limitation circuit, becomes the input signal of U4 after the signal process C16 phase compensation of U3B output.
The signal sample circuit of inductance type transducer described in the utility model can the height of sampling variable signal circuit, along with the variable signal output terminal of distance can be exported a sinusoidal waveform with the proportional variation of change of distance.Sample circuit described in the utility model is converted into the variation of sine wave freuqency with the variation in magnetic field, and is highly sensitive; Simultaneously whole sample circuit consists of a complete loop, to main signal with clutter repeatedly feed back amplification, filtering, signal stabilization and high conformity.
In sum, the utility model has effectively overcome various shortcoming of the prior art and the tool high industrial utilization.
Above-described embodiment is illustrative principle of the present utility model and effect thereof only, but not is used for restriction the utility model.Any person skilled in the art scholar all can be under spirit of the present utility model and category, and above-described embodiment is modified or changed.Therefore, have in the technical field under such as and know that usually the knowledgeable modifies or changes not breaking away from all equivalences of finishing under spirit that the utility model discloses and the technological thought, must be contained by claim of the present utility model.
Claims (8)
1. the signal sample circuit of an inductance type transducer is characterized in that, the signal sample circuit of described inductance type transducer comprises:
In order to produce the LC oscillating unit of oscillation frequency;
In parallel with described LC oscillating unit, in order to produce the sine wave generator unit of the sine wave that signal frequency changes with the variation of described oscillation frequency.
2. the signal sample circuit of inductance type transducer according to claim 1 is characterized in that: described LC oscillating unit comprises electric capacity and inductance in parallel.
3. the signal sample circuit of inductance type transducer according to claim 2, it is characterized in that: described sine wave generator unit comprises an amplifier U3A, the inverting input of described amplifier U3A links to each other with an end of described electric capacity, and the output terminal of amplifier U3A links to each other with the other end of described electric capacity.
4. the signal sample circuit of inductance type transducer according to claim 3, it is characterized in that: the signal sample circuit of described inductance type transducer also comprises an amplitude limitation unit, and the input end of described amplitude limitation unit links to each other with the output terminal of described sine wave generator unit.
5. the signal sample circuit of inductance type transducer according to claim 4, it is characterized in that: described amplitude limitation unit comprises an amplifier U3B, the inverting input of described amplifier U3B links to each other with the in-phase input end of described amplifier U3A, and the in-phase input end of described amplifier U3B links to each other with the output terminal of described amplifier U3A.
6. the signal sample circuit of inductance type transducer according to claim 5, it is characterized in that: the signal sample circuit of described inductance type transducer also comprises a phase compensation unit that links to each other with the output terminal of described amplifier U3B, and described phase compensation unit is electric capacity.
7. the signal sample circuit of inductance type transducer according to claim 6, it is characterized in that: the signal sample circuit of described inductance type transducer comprises that also one links to each other with described phase compensation unit, and in order to produce the square wave generation unit of the square wave identical with sine wave freuqency.
8. the signal sample circuit of inductance type transducer according to claim 7, it is characterized in that: described square wave generation unit comprises a silicon gate CMOS device U4, and the 1st pin of described silicon gate CMOS device U4 links to each other with described phase compensation unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220431816.6U CN202793425U (en) | 2012-08-28 | 2012-08-28 | Signal sampling circuit of inductive sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220431816.6U CN202793425U (en) | 2012-08-28 | 2012-08-28 | Signal sampling circuit of inductive sensor |
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| Publication Number | Publication Date |
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| CN202793425U true CN202793425U (en) | 2013-03-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201220431816.6U Expired - Lifetime CN202793425U (en) | 2012-08-28 | 2012-08-28 | Signal sampling circuit of inductive sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106586069A (en) * | 2016-11-30 | 2017-04-26 | 河南中烟工业有限责任公司 | Small packet aluminum foil damage detection device of packing machine |
| CN107997853A (en) * | 2016-10-28 | 2018-05-08 | 中国科学院宁波材料技术与工程研究所 | A kind of electronic bio integumentary system |
| CN110865531A (en) * | 2019-11-20 | 2020-03-06 | 北京无线电计量测试研究所 | Time interval measuring method and system based on nonlinear regression |
-
2012
- 2012-08-28 CN CN201220431816.6U patent/CN202793425U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107997853A (en) * | 2016-10-28 | 2018-05-08 | 中国科学院宁波材料技术与工程研究所 | A kind of electronic bio integumentary system |
| CN106586069A (en) * | 2016-11-30 | 2017-04-26 | 河南中烟工业有限责任公司 | Small packet aluminum foil damage detection device of packing machine |
| CN106586069B (en) * | 2016-11-30 | 2022-09-23 | 河南中烟工业有限责任公司 | Packagine machine capsule aluminium paper breakage detection device |
| CN110865531A (en) * | 2019-11-20 | 2020-03-06 | 北京无线电计量测试研究所 | Time interval measuring method and system based on nonlinear regression |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130313 |
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| CX01 | Expiry of patent term |