CN204882802U - Signal conditioning circuit of hyperfrequency sensor - Google Patents
Signal conditioning circuit of hyperfrequency sensor Download PDFInfo
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- CN204882802U CN204882802U CN201520541323.1U CN201520541323U CN204882802U CN 204882802 U CN204882802 U CN 204882802U CN 201520541323 U CN201520541323 U CN 201520541323U CN 204882802 U CN204882802 U CN 204882802U
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Abstract
The utility model relates to a signal conditioning circuit of hyperfrequency sensor, include: the antenna element, an impedance match unit, filtering unit, the 2nd impedance match unit, signal amplifying unit, the 3rd impedance match unit and the hyperfrequency logarithm detection unit that connect gradually. Above -mentioned signal conditioning circuit of hyperfrequency sensor behind antenna element receipt coupling partial discharge signal, through wave filter filtering interfering signal, then utilizes signal amplifying unit to carry out the signal amplification, and rethread hyperfrequency logarithmic detector is exported after carrying out the corresponding power detection of true RMS, improves the virtual value collection rate of signal for the precision of signal detection improves. Simultaneously, add the impedance match unit between each grade signal processing unit for impedance match between the two -stage signal processing unit of front and back improves signal transmission efficiency.
Description
Technical field
The utility model relates to a kind of signal conditioning circuit, particularly relates to a kind of signal conditioning circuit of the uhf sensor be applied in Partial Discharge Detection.
Background technology
Uhf sensor is a kind of electromagnetic wave signal by producing during ultra-high frequency antenna coupled high voltage electric equipment shelf depreciation, by the signal of antenna-coupled again through a series of processing of circuit, finally extracts the device of the ultra-high frequency signal that shelf depreciation produces.Because local discharge superhigh frequency detects, there is wider measurement bandwidth, compare other detection method, more shelf depreciation information can be obtained, utilize ultrahigh frequency to identify local electric discharge type and discharge position and more and more paid attention to and apply.
The problems such as traditional uhf sensor lacks signal condition process, the sampled signal obtained after causing entering uhf sensor to the new electromagnetic wave signal gathered, and the low and effectiveness of effective value acquisition rate is not high.
Utility model content
Based on this, signal is nursed one's health, with the signal conditioning circuit of the uhf sensor of the effective value acquisition rate and effectiveness that improve signal before a kind of input end to entering uhf sensor is provided.
The signal conditioning circuit of this uhf sensor, comprising: the antenna element connected successively, the first impedance matching unit, filter unit, the second impedance matching unit, signal amplification unit, the 3rd impedance matching unit and ultrahigh frequency logarithmic detector unit.
The signal conditioning circuit of above-mentioned uhf sensor, after receiving coupling local discharge signal by antenna element, through wave filter filtering interference signals, then signal amplification unit is utilized to carry out signal amplification, export after carrying out the corresponding power detection of real effective by ultrahigh frequency logarithmic detector again, improve the effective value acquisition rate of signal, the precision of input is improved.Meanwhile, between every one-level signal processing unit, add impedance matching unit, make the impedance matching between front and back stages signal processing unit, improve effectiveness.
Accompanying drawing explanation
Fig. 1 is the schematic block circuit diagram of the signal conditioning circuit of the uhf sensor of a kind of embodiment of the present utility model;
Fig. 2 is the schematic block circuit diagram of the signal conditioning circuit of the uhf sensor of another kind of embodiment of the present utility model;
Fig. 3 is the structural representation of the LC filtering circuit in wherein a kind of embodiment of the present utility model;
Fig. 4 is the structural representation of the π type filtering circuit in wherein a kind of embodiment of the present utility model;
Fig. 5 is the schematic block circuit diagram of the signal conditioning circuit of the uhf sensor of another kind of embodiment of the present utility model.
Embodiment
For feature of the present utility model, technological means and the specific purposes reached, function can be understood further, resolve advantage of the present utility model and spirit, by below in conjunction with accompanying drawing and embodiment, detailed description of the present utility model is further understood.
It should be noted that, the application is that circuit hardware improves, and the electronic chip applied in the application is existing commercially available chip, and structure wherein and the program applied are can know in prior art.
Refer to accompanying drawing 1, it is the schematic block circuit diagram of the signal conditioning circuit 10 of the uhf sensor of a kind of embodiment of the present utility model.
The signal conditioning circuit 10 of this uhf sensor, comprising: antenna element 110, first impedance matching unit 120 connected successively, filter unit 130, second impedance matching unit 140, signal amplification unit 150, the 3rd impedance matching unit 160 and ultrahigh frequency logarithmic detector unit 170.
The electromagnetic wave signal that extraneous high-voltage electrical equipment shelf depreciation produces is received coupling by antenna element 110, the filtering that filter unit 130 carries out undesired signal is entered through the be coupled coupled signal of gained of antenna element 110, coupled signal after filtering interference signals carries out signal through signal amplification unit 150 and amplifies process, enter after ultrahigh frequency logarithmic detector unit 170 carries out detection through the signal coupled signal amplified after process, export to the input end of uhf sensor.SMA interface can be adopted herein to dock with uhf sensor.
That is, the electromagnetic wave signal that antenna element 110 produces for receiving extraneous high-voltage electrical equipment shelf depreciation, be coupled the coupled signal obtained.Filter unit 130 is for the undesired signal in filtering coupled signal.Signal amplification unit 150, for being amplified by coupled signal, is convenient to follow-up signal processing unit identification and sampling.Ultrahigh frequency logarithmic detector unit 170, for coupled signal detection, improves the acquisition rate of signal effective value, makes the accuracy of detection of equipment promote further.
First impedance matching unit 120 is for making impedance matching between antenna element 110 and filter unit 130.Second impedance matching unit 140 is for impedance matching between filter unit and signal amplification unit 150.3rd impedance matching unit 160 is for the impedance matching between signal amplification unit 150 and ultrahigh frequency logarithmic detector unit 170.Signal or extensively electric energy, in transmitting procedure, for realizing no reflection events transmission or the maximum power transfer of signal, requiring that circuit connects and realizing impedance matching.Impedance matching is related to the overall performance of system, realizes coupling and system performance can be made to reach optimum.The concept of impedance matching has wide range of applications, impedance matching is common between amplifying circuit at different levels, between amplifying circuit and load, between signal and transmission circuit, in the design of microwave circuit and system, no matter be active or passive, all matching problem must be considered, such as: being voltage in low-frequency channel leads through-put power reduce with not mating of electric current, and be that guided electromagnetic wave does not mate serious reflection even can occur in high-frequency circuit, damage instrument and equipment.So in the present embodiment, between every one-level signal processing unit, all impedance matching unit can be added.
The signal conditioning circuit 10 of above-mentioned uhf sensor, after receiving coupling local discharge signal by antenna element 110, through wave filter filtering interference signals, then signal amplification unit 150 is utilized to carry out signal amplification, export after carrying out the corresponding power detection of real effective by ultrahigh frequency logarithmic detector again, improve the effective value acquisition rate of signal, the precision of input is improved.Meanwhile, between every one-level signal processing unit, add impedance matching unit, make the impedance matching between front and back stages signal processing unit, improve effectiveness.
Below for the structure of every grade of signal processing unit in the above embodiments, adopt following specific embodiment, make an explanation further.
Wherein in a kind of embodiment, antenna element 110 comprises plane horn formula antenna.Such as, within this day, plane horn antenna comprises positive pole, earth polar and pad, earth polar is provided with trumpet-shaped signal receiving end, positive pole is connected with earth polar, and the signal of pad for fixing positive pole and earth polar and for being collected by plane horn formula antenna passes to follow-up signal processing unit by interface (such as SMA interface).Plane horn formula antenna highly sensitive, and volume is little.Under the prerequisite ensureing detection sensitivity, reduce the volume of antenna element 110 further, the volume of integral device is reduced, is more convenient for carrying.The signal output port of plane horn formula antenna can adopt SMA interface.In order to strengthen Signal reception, and for example, multiple described plane horn formula antenna is set.
Wherein in a kind of embodiment, plane horn formula antenna comprises polytetrafluoroethylene electrode plate.Such as, the positive pole of plane horn formula antenna and negative pole are the battery lead plate adopting polytetrafluoroethylmaterial material to make.The advantage that polytetrafluoroethylene electrode plate possesses at least comprises: use working temperature to reach 250 DEG C.Possess good mechanical tenacity, what time temperature drops to the length growth rate that-196 DEG C also can keep 5%.To most of chemicals and solvent, show inertia, energy strong alkali-acid resistance, water and various organic solvent.There is longer aging life-span.There is less surface tension, be not easy to adhere to external substance.1500 volts of high-tension electricities can be resisted.
See accompanying drawing 2, it is the schematic block circuit diagram of the signal conditioning circuit 10 of wherein a kind of uhf sensor of embodiment of the present utility model.
In this embodiment, the signal conditioning circuit 10 of uhf sensor also comprises: non-detection output unit 180, the output terminal of the input end connection signal amplifying unit 150 of non-detection output unit 180, the output terminal of non-detection output unit 180 is used for docking with the shelf depreciation logging in the external world.In the detection of shelf depreciation, often need to be applied to shelf depreciation logging, be provided with doubleway output in the present embodiment, a road is that the detection after logarithmic detector detection exports, another road is the non-detection output without logarithmic detector detection, conveniently docks with shelf depreciation logging.Such as, adopt the signal output interface mated with shelf depreciation logging as non-detection output unit.
See accompanying drawing 3, it is the structural representation of the RC filtering circuit in wherein a kind of embodiment of the present utility model.
In this embodiment, filter unit 130 comprises LC filtering circuit 131.Although adopt single capacitor filtering or inductor filter, circuit is simple, and filter effect is not good enough, most of application requirements filter effect is better, then first two wave filter is joined together, before filter capacitor, namely add an inductance form LC filtering circuit 131, as shown in Figure 3.The alternating component of the voltage exported on load RL can be made like this to reduce further.This LC filtering circuit 131 is applicable to high frequency or comparatively large also requirement of load current is pulsed in very little electronic equipment.
See accompanying drawing 4, it is the structural representation of the π type filtering circuit 132 in wherein a kind of embodiment of the present utility model.
In this embodiment, filter unit 130 comprises π type filtering circuit 132.In order to reduce output voltage ripple component further, can before LC filtering circuit 131 filter capacitor in parallel again, as shown in Figure 4, constitute LC-pi type filter.The output current wave of pi type filter is more level and smooth.
Wherein in a kind of embodiment, ultrahigh frequency logarithmic detector unit 170 comprises AD8312 logarithmic detector.Wherein, AD8312 is the power detector of a kind of real effective response, measurement range 60dB.It can meet multiple high frequency communication system and instrument to the requirement of precise signal power detection.It uses simply only needs 5V power supply and some electric capacity.The effective value input that also can accept minimum 1mV to 1V from extremely low frequency to 1GHz can be operated in.For the signal of large peak factor, the requirement of accurately measuring CDMA signal can be met.AD8312 is perfect calibration, high precision, effective value-direct current transducer, and its measurement range is more than 60dB.Under the high-frequency signal of low frequency and at least 1GHz can be operated in.Different from common effective value-direct current transducer, its responsive bandwidth is not by the impact of signal amplitude.-3dB point is at 3.5GHz.The ability of this accurate measured waveform part have very high peak value-effective value ratio (the top factor) it by the impact of signal frequency and size.In the whole dynamic range of AD8312, especially at high frequency, such as described high frequency is more than 500MHz, all uses differential signal to input.In certain embodiments, the logarithmic detector close with AD8312 function can be adopted, as the logarithmic detector of the types such as AD8313 or AD8138.
Wherein in a kind of embodiment, the signal conditioning circuit 10 of above-mentioned uhf sensor also comprises power supply unit, power supply unit respectively with signal amplification unit 150 and ultrahigh frequency logarithmic detector single connection, for power supply.
See accompanying drawing 5, it is the schematic block circuit diagram of the signal conditioning circuit 10 of wherein a kind of uhf sensor of embodiment of the present utility model.
In this embodiment, the signal conditioning circuit 10 of uhf sensor also comprises input Overvoltage protecting unit 190, and input Overvoltage protecting unit 190 is connected between antenna element 110 and the first impedance matching unit 120.For security consideration, the high pressure of the generation of the output terminal at measurement of partial discharge medium-high frequency sensor is avoided to cause the damage of the circuit such as backend amplifier even to endanger personal safety.Therefore, add between the output terminal of antenna element 110 in the present embodiment and subsequent conditioning circuit unit and input Overvoltage protecting unit 190 to improve the security of circuit.
Wherein in a kind of embodiment; input Overvoltage protecting unit 190 comprises: protective resistance, the first protection electric capacity and the second protection electric capacity; protective resistance is in parallel with the output terminal of antenna element 110; first protection electric capacity is in parallel with protective resistance, and the second protection capacitances in series is between the first protection electric capacity and the first impedance matching unit 120.According to the principle of capacitance partial pressure; power-frequency voltage will produce very high dividing potential drop on a sensor; signal exit protective resistance in parallel, namely allows protective resistance and the first protection Capacitance parallel connection to reduce signal exit to the impedance of signal with reference to ground, the first protection capacitance terminal dividing potential drop is reduced.Such as: power-frequency voltage produces very high dividing potential drop by antenna element 110; too high voltage is produced for preventing antenna element 110 output terminal; in the signal exit of antenna element 110 protective resistance in parallel; namely allow protective resistance and the first protection Capacitance parallel connection to reduce antenna element 110 signal exit to the impedance of signal with reference to ground, the first protection capacitance terminal dividing potential drop is reduced.
Each technical characteristic of the above embodiment can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this instructions is recorded.
The above embodiment only have expressed several embodiment of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to utility model patent scope.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be as the criterion with claims.
Claims (10)
1. the signal conditioning circuit of a uhf sensor, it is characterized in that, comprising: the antenna element connected successively, the first impedance matching unit, filter unit, the second impedance matching unit, signal amplification unit, the 3rd impedance matching unit and ultrahigh frequency logarithmic detector unit.
2. the signal conditioning circuit of uhf sensor according to claim 1, is characterized in that, described antenna element comprises plane horn formula antenna.
3. the signal conditioning circuit of uhf sensor according to claim 2, is characterized in that, arranges multiple described plane horn formula antenna.
4. the signal conditioning circuit of uhf sensor according to claim 3, is characterized in that, described plane horn formula antenna comprises polytetrafluoroethylene electrode plate.
5. the signal conditioning circuit of uhf sensor according to claim 1, it is characterized in that, also comprise non-detection output unit, the input end of described non-detection output unit connects the output terminal of described signal amplification unit, and the output terminal of described non-detection output unit is used for docking with the shelf depreciation logging in the external world.
6. the signal conditioning circuit of uhf sensor according to claim 1, is characterized in that, described filter unit comprises LC filtering circuit.
7. the signal conditioning circuit of uhf sensor according to claim 1, is characterized in that, described filter unit comprises π type filtering circuit.
8. the signal conditioning circuit of uhf sensor according to claim 1, is characterized in that, described ultrahigh frequency logarithmic detector unit comprises AD8312 logarithmic detector.
9. the signal conditioning circuit of uhf sensor according to claim 1, is characterized in that, also comprises power supply unit, described power supply unit respectively with described signal amplification unit and described ultrahigh frequency logarithmic detector single connection.
10. the signal conditioning circuit of the uhf sensor according to any one of claim 1 to 9, is characterized in that, also comprises input Overvoltage protecting unit, and described input Overvoltage protecting unit is connected between described antenna element and described first impedance matching unit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520541323.1U CN204882802U (en) | 2015-07-22 | 2015-07-22 | Signal conditioning circuit of hyperfrequency sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520541323.1U CN204882802U (en) | 2015-07-22 | 2015-07-22 | Signal conditioning circuit of hyperfrequency sensor |
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| CN204882802U true CN204882802U (en) | 2015-12-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104991176A (en) * | 2015-07-22 | 2015-10-21 | 广州供电局有限公司 | Signal conditioning circuit for ultrahigh frequency sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104991176A (en) * | 2015-07-22 | 2015-10-21 | 广州供电局有限公司 | Signal conditioning circuit for ultrahigh frequency sensor |
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Effective date of registration: 20231110 Address after: 510620, No. two, No. 2, Tianhe South Road, Guangzhou, Guangdong, Tianhe District Patentee after: Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd. Patentee after: SHANGHAI JIAO TONG University Address before: 510620, No. two, No. 2, Tianhe South Road, Guangzhou, Guangdong, Tianhe District Patentee before: GUANGZHOU POWER SUPPLY Co.,Ltd. Patentee before: SHANGHAI JIAO TONG University |