CN208984694U - A kind of high-frequency and high-voltage interference fraudulent use detection device based on voice signal - Google Patents

Abstract

The utility model discloses a kind of, and the high-frequency and high-voltage based on voice signal interferes fraudulent use detection device, including sound pick-up, conditioning circuit, threshold value comparison circuit and repeated trigger single stabilization delay circuit.Sound pick-up, signal conditioning circuit, threshold value comparison circuit and repeatable triggering but steady delay circuit is successively connected in series, pass through three layers of single stabilization delay circuit signal condition, threshold value comparison circuit and repeatable triggering processing after sound pick-up picks up pickoff signals, it is ensured that issue warning signal when high-frequency and high-voltage interference electricity stealing occurs and reaches interference stealing intensity.The utility model can effectively avoid high-frequency and high-voltage from interfering the damage to device itself, high reliablity；The mature circuit composition that links are all built using common component, construction cost are low；All circuits all use conventional electronic circuitry, and circuit structure is simple, are suitble to the installation of various batch meter tight spaces.

Description

A kind of high-frequency and high-voltage interference fraudulent use detection device based on voice signal

Technical field

The utility model relates to detect and sensory field, more particularly, to a kind of high-frequency and high-voltage based on voice signal Interfere fraudulent use detection device.

Background technique

In recent years, higher than induction type electric energy meter accuracy, low in energy consumption due to electronic electric energy meter, starting current is small, load Many advantages, such as range is wide, without mechanical wear, applies more and more widely.And it is intelligently stolen for the high-tech of electronic electric energy meter Electrical phenomena emerges one after another, and electricity filching means also from traditional reconfiguration line, destruction metering device etc., develop to high using advanced high frequency It press dry and disturbs the stealing that electricity filching device carries out non-contact type.Due to the concealment of this kind of electricity filching means so that electricity stealing be difficult to by It was found that therefore as there is the gesture to grow in intensity in the appearance electricity stealing of these electricity filching devices.Electricity stealing is fallen from remote Rural area, small towns afterwards spreads to big city and industrial and mining enterprises, and the safe operation and economic benefit and society to power grid enterprises are pacified Full stabilization constitutes serious threat.

When interfering stealing using high-frequency and high-voltage, stealing molecule is using high-frequency and high-voltage discharge equipment directly to electronic electric energy meter High-frequency and high-voltage attack is carried out, the instantaneous strong electromagnetic radiation generated when discharging using high-frequency and high-voltage electric discharge device is to electronic electric energy meter Key components interfered.Since this electromagnetic radiation has the characteristics that the time is short, energy is concentrated and generation instantaneous high pressure, This kind of interference usually generates disturbing pulse vulnerable to interference position in electronic watt-hour watch circuit, causes the key of metering chip Component deteriorates, to influence electronic circuit normal work, and then influences electronic electric energy meter and normally measures to reach stealing Purpose.For this kind of stealing mode, have some detection devices based on electromagnetic sensor at present, but since such device is straight It connected the electromagnetic radiation of induction of high frequency high pressure interference to measure, therefore itself is also vulnerable to damage, therefore uses this method past Additional detection device loss is increased instead toward electricity stealing is not detected, and practical application effect is poor.And such device The electromagnetism spoke of the electromagnetic radiation and high-frequency and high-voltage interference stealing when the switch electrical equipment operating of electric energy meter perimeter load cannot be distinguished It penetrates, false alarm rate is higher.

Summary of the invention

The purpose of this utility model is to solve said one or multiple defects, and it is high to design a kind of high frequency based on voice signal It press dry and disturbs fraudulent use detection device.

To realize the above goal of the invention, the technical solution adopted is that:

A kind of high-frequency and high-voltage interference electricity filching device based on voice signal, including sound pick-up, signal conditioning circuit, threshold value ratio Compared with circuit and repeatable triggering single stabilization delay circuit；Wherein the input terminal of sound pick-up obtains voice signal, output end and signal tune Manage the input terminal electrical connection of circuit；The output end of signal conditioning circuit is electrically connected with the input terminal of threshold value comparison circuit；Threshold value ratio It is electrically connected compared with the output end of circuit with the input terminal of repeatable triggering single stabilization delay circuit, repeats triggering single stabilization delay circuit Output end exports pre-warning signal.

Preferably, the sound pick-up is condenser pick-up.

Preferably, the signal conditioning circuit includes amplifying circuit and filter circuit；The wherein input terminal of amplifying circuit It is electrically connected with the output end of sound pick-up, output end is electrically connected with the input terminal of filter circuit；The output end and threshold value of filter circuit The input terminal of comparison circuit is electrically connected.

Preferably, the filter circuit is the bandwidth-limited circuit of frequency range 600-1200Hz.

Preferably, the threshold value comparison circuit includes input circuit and voltage comparator circuit；Wherein input circuit is defeated Enter end to be electrically connected with the output end of signal conditioning circuit, output end is electrically connected with the input terminal of voltage comparator circuit；Voltage compares The output end of circuit is electrically connected with the input terminal of repeatable triggering single stabilization delay circuit.

Preferably, the input circuit includes that current-limiting resistance, limiter diode and operational amplifier are constituted；Wherein current limliting One end of resistance is electrically connected with the output end of signal conditioning circuit, and the other end is electrically connected with the anode of operational amplifier；Clipping two The cathode of pole pipe and the anode of operational amplifier, plus earth；The input of the output end and voltage comparator circuit of operational amplifier End electrical connection.

Preferably, the voltage comparator circuit is 10 step voltage comparison circuits, in series by 10 precision resistances The tapping voltage comparison circuit composition that divider and 10 reverse phase comparison voltage comparators are constituted, the same phase of each reverse phase comparator Input terminal is electrically connected with resitstance voltage divider, and inverting input terminal is electrically connected with the output end of input circuit.

Preferably, the repeatable triggering single stabilization delay circuit includes monostable repeated trigger circuit and pulse width detection electricity Road；Wherein monostable repeated trigger circuit output end is electrically connected with the input of pulse width detection circuit, pulse width detection circuit output end For the output end of whole device.

Preferably, the monostable repeated trigger circuit includes the monostable integrated circuit CD4528 of repeatable triggering, Primary output 20ms pulse signal is wherein triggered, is repeatedly triggered in 20ms, the pulse for being longer than 20ms is generated

Preferably, the pulse width detection circuit is made of single-chip microcontroller, when detecting monostable repeated trigger circuit output Pulse does not export pre-warning signal when being less than 2s, then defeated when detecting that monostable repeated trigger circuit output pulse is more than or equal to 2s Pre-warning signal out.

Compared with prior art, the utility model has the beneficial effects that

1) the utility model is that electric discharge sound adjoint during interfering stealing based on high-frequency and high-voltage does not send out molecule to perceive Electricity stealing, will not as direct Detection Method introduce high-frequency and high-voltage interference cause device itself to damage, high reliablity, engineer application Effect is good；

2) cost performance is high, and the mature circuit composition that device links are all built using common component, construction cost is low, And environmental disturbances factor can effectively be excluded by links collective effect, correct early warning rate is high, has very high performance and price Than；

3) small in size, it is light-weight, it is easy for installation.Signal processing circuit of the invention uses conventional electronic circuitry, circuit knot Structure is simple, requires, therefore device overall volume can be made very small, is particularly suitable for each without heat dissipation etc. without large size component The installation of kind batch meter tight space.

Detailed description of the invention

Fig. 1 is the integrated connection schematic diagram of the utility model；

Fig. 2 is threshold value comparison circuit diagram in the utility model.

Specific embodiment

The attached figures are only used for illustrative purposes and cannot be understood as limitating the patent；

Below in conjunction with drawings and examples, the present invention is further elaborated.

Embodiment 1

As shown in Figure 1, a kind of high-frequency and high-voltage based on voice signal interferes fraudulent use detection device: including for detecting sound Signal and the sound pick-up 1 that voice signal is converted to electric signal；For Signal Pretreatment to adapt to the signal that subsequent conditioning circuit uses Conditioning circuit 2；For determining the threshold value comparison circuit 3 of interference strength；And when being worked normally for filtering out other electrical equipments Electromagnetic noise prevent the repeatable triggering single stabilization delay circuit 4 of false alarm；Wherein sound pick-up 1, signal condition 2, threshold value comparison Circuit 3 and repeatable triggering but steady delay circuit 4 is successively connected in series, pass through signal tune after sound pick-up picks up 1 pickoff signals Reason 2, threshold value comparison circuit 3 and repeatable triggering but the 4 three layers of processing of steady delay circuit ensure high-frequency and high-voltage interfere occur and It is issued warning signal when reaching interference stealing intensity, in environmental disturbances and high-frequency and high-voltage interference but interference strength deficiency is occurring When do not issue warning signal.

As shown in figure 1, sound pick-up 1 is small using this bulk noise, Hz-KHz is wide, the condenser pick-up of strong antijamming capability, For picking up adjoint electric discharge voice signal when high-frequency and high-voltage interference occurs and converting it into electric signal.This bulk noise is small controllable System does not introduce this bulk noise when perceiving high-frequency and high-voltage interference sound signal, reduces the requirement of follow-up signal processing circuit；Frequency response Range is wide, can effectively cover the spectral range of high-frequency and high-voltage interference stealing electric discharge sound, it is ensured that perceptual signal is undistorted；Condenser type Voice signal is converted to electric signal by the variation of capacitance by sound pick-up, will not couple environment electromagnetic field as moving-coil pickup Variable signal, strong antijamming capability.

As shown in figure 1, signal conditioning circuit 2 includes the amplification for the small-signal of sound pick-up 1 to be converted to standard signal Circuit 20 and the filter circuit 21 that electric discharge voice signal is interfered for the non-high-frequency and high-voltage such as filtering environmental noise；Amplifying circuit 20 It is sequentially connected in series with filter circuit 21.The amplifying circuit 20 is constituted using reversed scaling circuit；The filter circuit 21 is adopted Bandwidth-limited circuit, and the electric discharge sound spectrum for interfering stealing process adjoint according to high-frequency and high-voltage are constituted with integrated operational amplifier Bandwidth-limited circuit frequency range is designed as 600~1200Hz by range.

As shown in Fig. 2, Fig. 1 total threshold value comparison circuit 3 is made of the step voltage of input circuit 30 and 10 comparison circuit 31. The input circuit 30 voltage follow in the same direction as composed by current-limiting resistance 301, limiter diode 302, operational amplifier 303 Device is constituted.The 10 step voltage comparison circuit 31 is compared by 10 precision resistances divider 311 and 10 reverse phase in series The tapping voltage comparison circuit 310 that voltage comparator is constituted forms, the non-inverting input terminal and electric resistance partial pressure of each reverse phase comparator Device is connected, and inverting input terminal is connected with the output end of input circuit 30, when input voltage is higher than the voltage of certain level-one, the grade And the output of following level voltage comparator is all low level.

In practical application, the selection of threshold value comparison circuit voltage is needed first according to determining pair of the performance of electric energy meter to be protected The high-frequency and high-voltage interference magnitude that electric energy meter impacts selects corresponding voltage class further according to determining amplitude, finally should The corresponding comparator output of voltage gradation is connected with late-class circuit realizes select andding set for threshold value.Pass through threshold value comparison circuit The low amplitude electromagnetic noise in batch meter external environment noise and batch meter inner part electric equipment operation can be filtered out.

As shown in Figure 1, repeatable triggering single stabilization delay circuit 4 includes monostable repeated trigger circuit 41 and pulse width detection electricity Road 42 is constituted, and 41 output end of monostable repeated trigger circuit is connected with the input of pulse width detection circuit 42, pulse width detection circuit 42 Output end is the output end of whole device, for being connected with other circuits.

In Fig. 1, monostable repeated trigger circuit 41 is real using the monostable integrated circuit CD4528 of the repeatable triggering in edge It is existing, primary output 20ms pulse signal is triggered, is repeatedly triggered in 20ms, the pulse for being longer than 20ms is generated；Pulse width detection electricity Road 42 is made of single-chip microcontroller, does not export pre-warning signal when detecting that monostable repeated trigger circuit 41 exports when pulse is less than 2s, Pre-warning signal is then exported when detecting that monostable repeated trigger circuit 41 exports when pulse is more than or equal to 2s.

In practical application, interference its intensity that whens electric equipment operations such as on-load switch generates be only possible to interfere occur when It is primary to carve at most triggering, 2S is not achieved；The high frequency very noisy interference of batch meter ambient enviroment other machines equipment operation, noise Intensity can not be multiple in 20ms triggering, to guarantee that it will not generate always the movement output signal of 2S；And in high-frequency and high-voltage It interferes in stealing ancient city under stepwise derivation environment, the interference sound signal strength generated is enough repeatedly to trigger monostable trigger The action signal for generating 2S, thus reliable alert.Repeatable triggering single stabilization delay circuit is repeated by monostable The time cooperation of trigger circuit and pulse width detection circuit can effectively exclude generate relatively strong electric discharge etc. in the batch meters such as on-load switch The false-alarm for the high frequency very noisy interference that other machines equipment is run around false-alarm caused by electromagnetic interference and batch meter, to guarantee The accuracy of alarm.

In Fig. 1, the pre-warning signal that output par, c is exported is the switching signal of low and high level, switching signal anti-interference ability By force, signals transmission can be effectively prevent to introduce interference, influence the accuracy of device operational reliability and early warning.

Obviously, the above embodiments of the present invention is only to clearly illustrate example of the present invention, and not to be It is the restriction to embodiments of the present invention.For those of ordinary skill in the art, on the basis of the above description It can also make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all Made any modifications, equivalent replacements, and improvements etc. within the spirit and principles in the present invention should be included in right of the present invention It is required that protection scope within.

Claims (10)

1. a kind of high-frequency and high-voltage based on voice signal interferes fraudulent use detection device, which is characterized in that including sound pick-up (1), letter Number conditioning circuit (2), threshold value comparison circuit (3) and repeatable triggering single stabilization delay circuit (4)；The wherein input of sound pick-up (1) End obtains voice signal, and output end is electrically connected with the input terminal of signal conditioning circuit (2)；The output end of signal conditioning circuit (2) It is electrically connected with the input terminal of threshold value comparison circuit (3)；The output end of threshold value comparison circuit (3) and the monostable delay electricity of repeatable triggering The input terminal on road (4) is electrically connected, and the output end for repeating triggering single stabilization delay circuit (4) exports pre-warning signal.

2. a kind of high-frequency and high-voltage based on voice signal according to claim 1 interferes fraudulent use detection device, feature exists In the sound pick-up (1) is condenser pick-up.

3. a kind of high-frequency and high-voltage based on voice signal according to claim 1 interferes fraudulent use detection device, feature exists In the signal conditioning circuit (2) includes amplifying circuit (20) and filter circuit (21)；The wherein input terminal of amplifying circuit (20) It is electrically connected with the output end of sound pick-up (1), output end is electrically connected with the input terminal of filter circuit (21)；Filter circuit (21) it is defeated Outlet is electrically connected with the input terminal of threshold value comparison circuit (3).

4. a kind of high-frequency and high-voltage based on voice signal according to claim 3 interferes fraudulent use detection device, feature exists In the filter circuit (21) is the bandwidth-limited circuit of frequency range 600-1200Hz.

5. a kind of high-frequency and high-voltage based on voice signal according to claim 1 interferes fraudulent use detection device, feature exists In the threshold value comparison circuit (3) includes input circuit (30) and voltage comparator circuit (31)；Wherein input circuit (30) is defeated Enter end to be electrically connected with the output end of signal conditioning circuit (2), output end is electrically connected with the input terminal of voltage comparator circuit (31)；Electricity The output end of comparison circuit (31) and the input terminal of repeatable triggering single stabilization delay circuit (4) is pressed to be electrically connected.

6. a kind of high-frequency and high-voltage based on voice signal according to claim 5 interferes fraudulent use detection device, feature exists In the input circuit (30) includes that current-limiting resistance (301), limiter diode (302) and operational amplifier (303) are constituted；Its One end of middle current-limiting resistance (301) is electrically connected with the output end of signal conditioning circuit (2), the other end and operational amplifier (303) Anode electrical connection；The cathode of limiter diode (302) and the anode of operational amplifier (303), plus earth；Operational amplifier (303) output end is electrically connected with the input terminal of voltage comparator circuit (31).

7. a kind of high-frequency and high-voltage based on voice signal according to claim 5 interferes fraudulent use detection device, feature exists In the voltage comparator circuit (31) is 10 step voltage comparison circuits, by 10 precision resistances divider (311) in series Tapping voltage comparison circuit (310) composition constituted with 10 reverse phase comparison voltage comparators, the same phase of each reverse phase comparator Input terminal is electrically connected with resitstance voltage divider, and inverting input terminal is electrically connected with the output end of input circuit (30).

8. a kind of high-frequency and high-voltage based on voice signal according to claim 1 interferes fraudulent use detection device, feature exists In the repeatable triggering single stabilization delay circuit (4) includes monostable repeated trigger circuit (41) and pulse width detection circuit (42)； Wherein monostable repeated trigger circuit (41) output end is electrically connected with the input of pulse width detection circuit (42), pulse width detection circuit (42) output end is the output end of whole device.

9. a kind of high-frequency and high-voltage based on voice signal according to claim 8 interferes fraudulent use detection device, feature exists In the monostable repeated trigger circuit (41) includes the monostable integrated circuit CD4528 of repeatable triggering, wherein triggering one Secondary output 20ms pulse signal repeatedly triggers in 20ms, generates the pulse for being longer than 20ms.

10. a kind of high-frequency and high-voltage based on voice signal according to claim 8 interferes fraudulent use detection device, feature exists In, the pulse width detection circuit (42) is made of single-chip microcontroller, when detect monostable repeated trigger circuit (41) output pulse it is small Pre-warning signal is not exported when 2s, is then exported when detecting that monostable repeated trigger circuit (41) output pulse is more than or equal to 2s Pre-warning signal.