CN2205978Y - Anti-theft alarm transmitter for power line - Google Patents
Anti-theft alarm transmitter for power line Download PDFInfo
- Publication number
- CN2205978Y CN2205978Y CN 94213397 CN94213397U CN2205978Y CN 2205978 Y CN2205978 Y CN 2205978Y CN 94213397 CN94213397 CN 94213397 CN 94213397 U CN94213397 U CN 94213397U CN 2205978 Y CN2205978 Y CN 2205978Y
- Authority
- CN
- China
- Prior art keywords
- circuit
- power
- radio transmitter
- utility
- model
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model belongs to an anti-theft alarm transmitter for power lines. The utility model is used for anti-theft and alarm for the power lines at the countryside, composed of a checking resistor which is distributed at the terminal of a power circuit, a checking circuit installed in a machine shell, an alarm circuit and a wireless transmitting circuit. The utility model can alarm in time under the two conditions that the power line is cut off and short-circuited. Accordingly the utility model has the advantages of high reliability, simple structure, low power consumption, flexible operation, and convenient operation.
Description
The utility model relates to a kind of power circuit burglar alarm, particularly a kind of rural power circuit burglar alarm transmitter.
The power circuit in rural area, power line especially for the farmland is distributed on the meagrely-populated field, in farm slack season, on the shelf mostly, this has caused the opportunity of stealing power circuit just for some lawless persons, in some areas, the phenomenon that power circuit is stolen happens occasionally, and has caused very big economic loss to agricultural.But, up to the present, also do not have a kind of effective means to prevent that the phenomenon of stealing power circuit from taking place.
The purpose of this utility model provides a kind of power circuit burglar alarm transmitter that can in time notify the power circuit maintainer when power circuit is stolen.
The utility model comprises the detection resistance that is distributed in the line of electric force terminal, it is characterized in that also comprising the testing circuit, warning circuit and the radio transmitter that are contained in the casing; Testing circuit has two groups of direct-coupled on-off circuits of two-stage and is serially connected in two groups of relays in the direct coupled switch circuit output end of the two-stage electric power loop, and 3 input terminals of testing circuit join with three-phase power line respectively; Warning circuit has the oscillatory circuit and the loudspeaker of two serial connections, and the normal opened contact of its power input and above-mentioned relay joins; Radio transmitter has one and is arranged on the microphone at a place with above-mentioned loudspeaker, a prime amplifier that is used to amplify microphone input signal, the modulation circuit that the prime amplifier input signal is modulated, a power amplifier and the emitting antenna that the modulation signal of being sent into by modulation circuit is amplified, the power input of radio transmitter and above-mentioned relay normally open contact join.When power circuit is stolen, the equivalent resistance resistance of testing circuit input end changes, relay power, its normal opened contact closure, power up for warning circuit, radio transmitter, warning circuit sends chimes of doom, and this chimes of doom is sent into radiating circuit and is modulated into amplitude-modulated signal by microphone and launches.
The utility model is cut off at power circuit, can both report to the police under two kinds of situations of short circuit, thereby the reliability height, in addition the utility model also have simple in structure, the characteristics that power consumption is low, flexible and convenient to use.
Fig. 1 is a circuit diagram of the present utility model.
Below in conjunction with accompanying drawing the utility model is further described.
Detecting two of resistance is one group, as RX
1, RX
6Be attempted by between two lines of a three-phase power line terminal, RX is arranged in the drawings
1-RX
10Totally 10 are detected resistance, so just can carry out burglar alarm, RX to five line of electric force
1-RX
5, RX
6-RX
10As three the input terminal Ss of two biasing resistors by power circuit and testing circuit
1, S
2, S
3Join.
Testing circuit has by capacitor C
1, resistance R
1, R
4, potentiometer W
2, triode BG
1, BG
3The direct coupled switch circuit of one group of secondary that constitutes, capacitor C
2, potentiometer W
2, resistance R
2, R
5Triode BG
2, BG
4Another that constitutes organized two extremely direct coupled switch circuit and is serially connected in two groups of relay J in the on-off circuit output end power loop, R in the drawings
3Be dropping resistor, capacitor C
3, diode D
1Be the protecting component of relay J, when power circuit just often, by adjusting potentiometer W
1, W
2Make BG
1, BG
2Place's conducting state, BG
1, BG
2Conducting make BG again
3, BG
4Be in cut-off state, like this, the winding of relay J does not have electric current to pass through, and its contact is in normally open.When power circuit is cut off (as RX
1Disconnect) time, make by detecting the biasing resistor resistance increase that resistance constitutes, BG
1End BG
2Conducting, the winding of relay J passes through BG
3Collector current, relay work, its normal opened contact closure adds working power for warning circuit and radio transmitter, makes its work.When power line short-circuit (as RX
1By short circuit), make BG
2Base current reduce BG
2End BG
4Conducting, the relay J winding passes through BG
4Collector current, its normal opened contact closure adds working power for warning circuit and radio transmitter.
Warning circuit comprises by resistance R
6-R
11, capacitor C
7, transistor BG
5, BG
6The resistance-capacitance oscillator that constitutes and by potentiometer W
3, capacitor C
8, resistance R
12, R
13, triode BG
7, BG
8Another resistance-capacitance oscillator and the loudspeaker Y that constitute, two oscillators are connected in series mutually, and its working power is sent into by the normal opened contact of above-mentioned relay J, and after power supply was sent into, oscillator work was also sent chimes of doom by loudspeaker.
Radio transmitter has, a microphone MC who is arranged on the loudspeaker place, and one by potentiometer W
4, resistance R
14-R
16, capacitor C
10-C
13, the amplifier ic chip
1The prime amplifier that is used to amplify microphone input signal that constitutes, one by resistance R
17-R
20, capacitor C
14-C
16, triode BG
11, crystal X, inductance L
2What constitute is used to modulate the modulation circuit that prime amplifier is sent into signal, and one by transformer B
1, B
2, triode BG
9, BG
10, capacitor C
16, C
17Being used for of constituting, amplification modulating circuit was sent into the power amplifier of signal and by inductance L
3The antenna that constitutes.Its working power is sent into by the normal opened contact of relay J.Behind the power connection, microphone is converted to electric signal with the chimes of doom that warning circuit sends, after prime amplifier amplifies, becoming carrier frequency by modulating circuit modulates again is the amplitude-modulated signal of 30.75MHZ, launched by antenna through power amplifier, the maintainer just can pass through receiver (the same short wave receiver of circuit) and receive alerting signal.
In sum, can learn, when testing circuit detects the pilferage behavior, warning circuit and radio transmitter power up simultaneously automatically, on the one hand by near the maintainer the chimes of doom notice, by radio transmitter notice maintainer far away, therefore the utlity model has and use flexibly, easily characteristics on the other hand.
In addition, when detection resistance was sealed in the input end of power transformation device, according to above-mentioned principle, the utility model also can be used for the burglar alarm of electric power power transformation device.
Claims (1)
1, a kind of power circuit burglar alarm transmitter comprises the detection resistance that is distributed in the power circuit terminal, it is characterized in that also comprising the testing circuit, warning circuit and the radio transmitter that are contained in the casing; Testing circuit has two groups of direct-coupled on-off circuits of two-stage and is serially connected in two groups of relays in the direct coupled switch circuit output end of the two-stage electric power loop, and 3 input terminals of testing circuit join with three-phase power line respectively; Warning circuit has the oscillatory circuit and the loudspeaker of two serial connections, and the normal opened contact of its power input and above-mentioned relay joins; Radio transmitter has one and is arranged on the microphone at a place with above-mentioned loudspeaker, a prime amplifier that is used to amplify microphone input signal, the modulation circuit that the prime amplifier input signal is modulated, a power amplifier and the emitting antenna that the modulation signal of being sent into by modulation circuit is amplified, the power input of radio transmitter and above-mentioned relay normally open contact join.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94213397 CN2205978Y (en) | 1994-06-09 | 1994-06-09 | Anti-theft alarm transmitter for power line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94213397 CN2205978Y (en) | 1994-06-09 | 1994-06-09 | Anti-theft alarm transmitter for power line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2205978Y true CN2205978Y (en) | 1995-08-23 |
Family
ID=33829969
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94213397 Expired - Fee Related CN2205978Y (en) | 1994-06-09 | 1994-06-09 | Anti-theft alarm transmitter for power line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2205978Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100447823C (en) * | 2006-12-07 | 2008-12-31 | 时均泉 | Caution device of monitoring low voltage distribution line |
-
1994
- 1994-06-09 CN CN 94213397 patent/CN2205978Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100447823C (en) * | 2006-12-07 | 2008-12-31 | 时均泉 | Caution device of monitoring low voltage distribution line |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |