CN2435799Y

CN2435799Y - Antistatic alarm

Info

Publication number: CN2435799Y
Application number: CN 00234195
Authority: CN
Inventors: 戚有奕
Original assignee: CHANGPING INTELLIGENT SCIENTIFIC INSTRUMENT FACTORY BEIJIGN
Current assignee: CHANGPING INTELLIGENT SCIENTIFIC INSTRUMENT FACTORY BEIJIGN
Priority date: 2000-05-08
Filing date: 2000-05-08
Publication date: 2001-06-20
Anticipated expiration: 2010-05-08

Abstract

The utility model relates to an antistatic alarm, which comprises a sampling circuit and an alarm circuit. The utility model is characterized in that the alarm also comprises a frequency-selecting circuit; the output terminal of the sampling circuit is used for the input terminal of the frequency-selecting circuit; the output terminal of the frequency-selecting circuit is connected with the input terminal of the alarm circuit; the sampling circuit is a loop-shaped antenna and the frequency-selecting circuit is a band pass filter band-pass filter. The utility model has the advantages of strong interference resistance, particularly antistatic interference, low power consumption, high sensitivity, no external antenna, small volume, convenient installation, etc. and can be used for a safe protective device in industries, electric power industries, building fields, etc. as well as in household.

Description

A kind of alarming in short range of electric power device

The utility model relates to a kind of warning device, particularly a kind ofly can the people during near high-tension line, send the safety alarm device of alerting signal.

At present, electric power industry development is rapid, and transmission voltage is more and more higher, and thing followed safety problem also becomes increasingly conspicuous.Especially for the maintenance of city power transmission network, usually be difficult to distinguish which transmission line of electricity is in the outage service mode.Although in the industry working specification electrical verification is had clear and definite regulation, electric shock accidents is still continuous, causes irremediable loss for individual and country.For this reason, the alarming in short range of electric power device arises at the historic moment, and it can during near the electrification in high voltage circuit, send alerting signal in advance personnel, avoids the generation of accident.

But there are many disadvantages in the alarming in short range of electric power device of Xiao Shouing in the market, mainly contains the following aspects: 1. be subjected to the interference of the interference, particularly static of external environment easily, cause false alarm, influence is worked normally; 2. though they can be coiled in the safety helmet, need external antenna even ground wire, in some arduouser operation occasions coming off of antenna or ground wire being taken place easily, thereby loses warning function; 3. complex structure: generally adopt field effect transistor (as 3DJ6) or CMOS small scale integration 4011 to take collection and form, be equipped with many peripheral circuits, device is many, and the circuit structure complexity is damaged easily; 4. power consumption is big: adopt multiple batteries, also need often to change; 5. volume is big: account for certain volume in safety helmet, can influence the security of safety helmet.

Goal of the invention of the present utility model just is to overcome above-mentioned many shortcomings of existing alarming in short range of electric power device, a kind of strong interference immunity is provided, can need not the backguy antenna, available, the simple in structure alarming in short range of electric power device small and exquisite, low in energy consumption of a plurality of sensitivity gears is arranged.

In order to realize above-mentioned goal of the invention, the utility model has adopted following technical scheme: a kind of alarming in short range of electric power device, comprise sample circuit and warning circuit, it is characterized in that, also comprise frequency selection circuit, the output terminal of described sample circuit is as the input end of frequency selection circuit, and the output terminal of frequency selection circuit is connected with the input end of warning circuit, and this frequency selection circuit is used for filtering out from numerous undesired signals the voltage signal of required warning.

Of the present utility model being further characterized in that, described sample circuit is a coil antenna, described frequency selection circuit is a bandpass filter.

Of the present utility model another is characterised in that, described coil antenna can be the toroidal conductor that directly is etched on the printed-wiring board (PWB), also can be the tours antenna that is coiled on the warning device shell.

Of the present utility model another is characterised in that, also comprises several shunt resistances between described sample circuit and frequency selection circuit, is used to set several different warning sensitivity gears.

Below in conjunction with accompanying drawing the utility model is further elaborated.

Fig. 1 is a schematic appearance of the present utility model;

Fig. 2 is a circuit block diagram of the present utility model;

Fig. 3 is the circuit theory diagrams of a preferred embodiment of the present utility model;

Fig. 4 is the circuit theory diagrams of integrated circuit I1 in the preferred embodiment shown in Figure 3.

Circuit block diagram in conjunction with Fig. 2 can be seen, because the utility model has increased frequency selection circuit between existing sample circuit and warning circuit, at first the various signals that obtained by antenna induction are screened, the selection of its frequency can be decided as required, for example only select the ac signal of 30～80Hz, particularly 50Hz.Can prevent the interference of static and other electric signal so effectively, improve the reliability of alarm.This frequency selection circuit can be realized with existing conventional bandwidth-limited circuit, as forming by the discrete component overlap joint, can also realize with integrated chip.

For fear of the drawback of external antenna, a kind of preferred embodiment of the present utility model is to utilize the toroidal conductor A that directly is etched on the printed-wiring board (PWB) sampling receiving antenna as alarm, so both can simplified structure, can reduce the generation of fault again.Certainly, also can substitute toroidal conductor on the printed-wiring board (PWB) with being coiled in external tours antenna on the body case of annunciator.

Warning device of the present utility model also provides the sensitivity selecting switch of many gears, promptly can be according to the difference of working environment, select different alarm distances, for example, set three different sensitivity gears by toggle switch S3 by being arranged on three shunt resistance R1, R2, the R3 (referring to Fig. 3) on the sample circuit.A kind of preferred embodiment of the present utility model is: the resistance of R1, R2, R3 is respectively 60 megaohms, 10 megaohms and 2 megaohms, at this moment, the relation of pairing alarm voltage of gear wherein (R2) and alarm distance is referring to table 1, and the alarm distance of corresponding low-grade location or high tap position is respectively half of middle gear or doubles.

Table 1

Gear is selected	The alarm voltage that is suitable for	Alarm distance
Gear is selected	The alarm voltage that is suitable for	Alarm distance	Middle-grade	220V	〉=3 millimeters
Middle-grade	6KV	〉=0.5 meter	Middle-grade	220V	〉=3 millimeters
Middle-grade	6KV	〉=0.5 meter	Middle-grade	10KV	〉=1 meter
Middle-grade	35KV	〉=2 meters	Middle-grade	10KV	〉=1 meter

For the alerting signal that alarm is changed, the utility model has also been set up a quartz (controlled) oscillator, as using the conventional wrist-watch quartz crystal L1 that can produce the 32.768KHz oscillation frequency, utilize a frequency divider (as 14 grades of frequency dividers) simultaneously, the frequency that oscillator is produced is divided into several required different frequencies, as 2048Hz and 2Hz, be used to drive alarm, thereby produce the alarm sound effect that height changes.

In order to reduce the power consumption of alarm effectively, the while is simplified structure further, and an embodiment preferred of the present utility model has adopted the integrated circuit die I 1 (as shown in Figure 3) of design voluntarily, and the circuit theory of this chip is illustrated in Fig. 4.Frequency selection circuit wherein can adopt conventional bandwidth-limited circuit, and frequency dividing circuit can adopt the chip core such as models such as CD4060 or MC14060, and employed each gate circuit is low power cmos element.This structural design scheme, on the one hand can with the volume-diminished of alarm to long * wide * high=4 * 3 * 1.3 centimetres; Power consumption can be reduced to such level on the other hand: working current at ordinary times is 1 microampere, alarm current≤3 milliampere, and required power supply can adopt the button cell of 1.5V.Calculate by theoretical, adopt the sort circuit design, battery can continuous working more than 3 years, and its sensitivity simultaneously and reliability have also obtained enhancing.

In conjunction with Fig. 3 and preferred embodiment of the present utility model shown in Figure 4, principle of work of the present utility model now is described: the various induced signals that induction antenna A receives are through different shunting (decay) resistance (R1, R2, R3) after, enter integrated circuit die I 1 by pin one, through the 50Hz frequency selection circuit, take out the induced signal identical with ultra-high-tension power transmission line, when signal intensity during greater than certain predefined threshold voltage, triggering the low-and high-frequency oscillator of LI quartz crystal and corresponding gate circuit composition starts working, intermittently the alarm audio signal that continues is by pin 4 outputs, after power amplification and inductance (T2) lifting, promote hummer BU1 and send alarm sound.Pin two is designed to the self check input end, can report to the police by self-test switch S4 simulation.This pin inside is provided with pull down resistor R4, the misoperation that noise jamming causes in the time of can avoiding unsettled.

Employed alarm element can be the miniwatt alarm appliance of any model, as: hummer can also be the suitable element that produces light signal or other electric signal.

For the ease of installing, can utilize two-sided sticker, stick on the safety helmet alarm of the present utility model or inside.

The utility model not only can be used for power industry, can also be used for such as building or other industrial circles, even can be used as the safety guard of family.

Claims

1. alarming in short range of electric power device, comprise sample circuit and warning circuit, it is characterized in that, also comprise frequency selection circuit, the output terminal of described sample circuit is as the input end of frequency selection circuit, the output terminal of frequency selection circuit is connected with the input end of warning circuit, and this frequency selection circuit is used for filtering out required frequency signal from numerous undesired signals.

2. warning device as claimed in claim 1, it is further characterized in that described sample circuit is coil antenna (A), described frequency selection circuit is a bandpass filter.

3. warning device as claimed in claim 1 or 2, it is further characterized in that described coil antenna (A) is the toroidal conductor that directly is etched on the printed-wiring board (PWB).

4. warning device as claimed in claim 3, it is further characterized in that, also comprises several shunt resistances between described sample circuit and frequency selection circuit, is used to set several different warning sensitivity gears.

5. warning device as claimed in claim 4, it is further characterized in that described shunt resistance quantity is three, its resistance preferably is respectively 2 megaohms, 10 megaohms and 60 megaohms.

6. warning device as claimed in claim 5, it is further characterized in that, described warning circuit be by a crystal oscillation circuit behind the frequency divider frequency division, reconfigure again, as the drive signal of alarm.

7. warning device as claimed in claim 6, it is further characterized in that, described frequency divider and described frequency selection circuit and corresponding gate circuit together are integrated in the integrated circuit (IC) chip (I1), wherein each circuit component all adopts the cmos element of low-power consumption, the selected frequency range of described frequency selection circuit is between 30～80Hz, 50Hz preferably, described crystal oscillation circuit adopts the quartz crystal (L1) of 32.768KHz.

8. warning device as claimed in claim 1, it is further characterized in that, can be fixedly mounted on the safety helmet this warning device or its inside by the double-sided adhesive band that sticks on this warning device shell.

9. as claim 1 or 7 described warning devices, it is further characterized in that the employed power supply of this warning device is 1 joint 1.5V coin shape battery.

10. warning device as claimed in claim 6, it is further characterized in that, also comprises a self-test switch S4 in this warning circuit.