CN2862527Y - Theft-using protection alarming device for telephone - Google Patents
Theft-using protection alarming device for telephone Download PDFInfo
- Publication number
- CN2862527Y CN2862527Y CN 200520059310 CN200520059310U CN2862527Y CN 2862527 Y CN2862527 Y CN 2862527Y CN 200520059310 CN200520059310 CN 200520059310 CN 200520059310 U CN200520059310 U CN 200520059310U CN 2862527 Y CN2862527 Y CN 2862527Y
- Authority
- CN
- China
- Prior art keywords
- circuit
- telephone
- expense
- embezzling
- free call
- 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 discloses a warning device guarding against telephone's being embezzled by means of an on-line with the exterior line. It comprises an embezzling identification circuit, an interference generation circuit, a power constant circuit. The input end of the embezzling identification circuit is the input end of the device. The output end of the power constant circuit is the output end of the device. The input end of the embezzling identification circuit is connected with a pressure drop sensing circuit which is connected with a voltage compensation circuit. The voltage compensation circuit comprises a built-in power supply and a electricizing control. The utility model telephone's anti-embezzling warning device can guard against the telephone' being embezzled in the case that the telephone embezzler can by-pass the common anti-embezzling unit sold in market through reducing the voltage of the telephone's exterior line. Comprising only a few of component groups, featuring a simple structure and a low cost. Furthermore, capable of prompting the user in time in the event of being wired illegally.
Description
Technical field
The utility model relates to phone, relates in particular to prevent that the outside line parallel operation from carrying out the anti-free call on sb. else's expense through illegal means warning device of fraudulent use of telephone.
Background technology
At present, existing preventing telephone from dialing without admission warning device is mainly by circuit such as antitheft identification circuit, interference generation circuit, sound and light alarms, its operation principle be when detecting that telephone line voltages is improper to be reduced to the release disturbing wave of doubling free call on somebody else's expense through illegal means, and send sound and light alarm information simultaneously.But some free calls on somebody else's expense through illegal means are provided with the voltage automatic regulating apparatus, artificially line voltage distribution is reduced to the existence whether 10V has interference signal to produce when following to judge anti-free call on sb. else's expense through illegal means device by automatic monitoring, and further according to testing result dynamically reduce line voltage distribution at 1V between the 5V, making common anti-free call on sb. else's expense through illegal means warning device can't operate as normal because voltage is low, simultaneously real user when using phone also because of phone voltage is low, phone cisco unity malfunction and do not know to have the people just in free call on sb. else's expense through illegal means.So the anti-free call on sb. else's expense through illegal means device of prior art can not prevent completely that phone is by the doubling free call on sb. else's expense through illegal means.
Summary of the invention
It is a kind of can be lower than operating voltage at the voltage of telephone line the time that the utility model purpose is to provide, and still can keep the preventing telephone from dialing without admission warning device of anti-free call on sb. else's expense through illegal means function.
A kind of preventing telephone from dialing without admission warning device of the present utility model, comprise the free call on sb. else's expense through illegal means identification circuit, disturb circuit, power invariability circuit take place, free call on sb. else's expense through illegal means identification circuit input is the device input, the power invariability circuit output end is the device output, it is characterized in that: free call on sb. else's expense through illegal means identification circuit input also connects voltage drop detection circuit, and voltage drop detection circuit connects voltage compensating circuit.
Described voltage drop detection circuit is made up of voltage stabilizing didoe D2 and triode T1; Described voltage compensating circuit is made up of built-in power and charge controller.
Described free call on sb. else's expense through illegal means identification circuit input also connects the wiring check circuit, and this wiring check circuit is made up of light-emitting diode D1.
During use, earlier outside line is connected input,,, then show wiring error, need two outside lines are exchanged if light-emitting diode D1 does not work in the wiring check circuit then with power connection.Output connects the phone phone again, and when doubling and line drop situation occurring, the voltage compensation line start is kept this circuit interferance generator and power controller normal working voltage partly, guarantees the alarm operate as normal; Disturb the generation circuit to send the interference oscillatory signal, and by sound and light alarm signal alarm, call user's attention.The power invariability circuit is to disturb in order to adapt in the interference signal that level such as all providing when what degree the hitter drop to line voltage distribution is provided, but can carry out effective self-protection during circuit dead short circuit.
Preventing telephone from dialing without admission warning device of the present utility model, on existing Device for anti-fraudulent use telephone line basis, increase built-in power and charge controller, power invariability circuit, anti-free call on sb. else's expense through illegal means function is improved greatly, thereby can prevent that free call on somebody else's expense through illegal means person from do not work common alarm by reducing outside line voltage, reaches the purpose of free call on somebody else's expense through illegal means.Preventing telephone from dialing without admission warning device of the present utility model only is made up of several elements, and simple in structure, cost is lower, not only can thoroughly prevent phone by free call on sb. else's expense through illegal means, and when occurring stealing the link situation, can in time remind the user.
Description of drawings
Fig. 1 is the workflow schematic diagram of the utility model preventing telephone from dialing without admission warning device;
Fig. 2 is the circuit connection diagram of the utility model preventing telephone from dialing without admission warning device.
Embodiment
Below in conjunction with accompanying drawing the utility model preventing telephone from dialing without admission warning device is described further.
The utility model preventing telephone from dialing without admission warning device by voltage drop detection circuit, voltage compensating circuit, free call on sb. else's expense through illegal means identification circuit, disturbs five most of compositions of circuit, power invariability circuit takes place, the input outside line of answering the call, the output phone of answering the call.Whether voltage drop detection circuit detection line voltage changes, voltage compensating circuit is inoperative under the normal condition, when line voltage distribution reduces, and the voltage compensating circuit starting, keep the normal working voltage of interferance generator and power controller part, guarantee the alarm operate as normal; Whether free call on sb. else's expense through illegal means identification circuit decision circuitry has by the free call on sb. else's expense through illegal means situation, when free call on sb. else's expense through illegal means occurring, disturbs the circuit starting takes place, and the free call on sb. else's expense through illegal means circuit is produced disturb.
Referring to Fig. 2, voltage compensating circuit is made up of built-in power and charge controller, and this charge controller is little electric current.Voltage drop detection circuit and free call on sb. else's expense through illegal means identification circuit merge, and are made up of voltage stabilizing didoe D2, triode T1, capacitor C, diode D4 and triode group T2, T3.Triode T2 emitter connects to disturb circuit takes place, and this disturbs the generation circuit to be made up of an interferance generator, connects warning light-emitting diode D3 simultaneously.Interferance generator connects the power invariability circuit, should be made up of the APC automatic power controller the power invariability circuit.
Free call on sb. else's expense through illegal means identification circuit input also connects the wiring check circuit, and this wiring check circuit is made up of light-emitting diode D1.
The utility model preventing telephone from dialing without admission warning device is applicable to family, the anti-free call on sb. else's expense through illegal means of office telephone.This device can be produced and sold as alarm separately, also can merge with telephone set and produce and sell, and performance is affluent, practical, use is quite convenient.
Claims (2)
1. preventing telephone from dialing without admission warning device, comprise the free call on sb. else's expense through illegal means identification circuit, disturb circuit, power invariability circuit take place, free call on sb. else's expense through illegal means identification circuit input is the device input, the power invariability circuit output end is the device output, it is characterized in that: free call on sb. else's expense through illegal means identification circuit input also connects voltage drop detection circuit, and voltage drop detection circuit connects voltage compensating circuit.
2. preventing telephone from dialing without admission warning device according to claim 1 is characterized in that: described free call on sb. else's expense through illegal means identification circuit input also connects the wiring check circuit, and this wiring check circuit is made up of light-emitting diode D1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520059310 CN2862527Y (en) | 2005-06-07 | 2005-06-07 | Theft-using protection alarming device for telephone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520059310 CN2862527Y (en) | 2005-06-07 | 2005-06-07 | Theft-using protection alarming device for telephone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2862527Y true CN2862527Y (en) | 2007-01-24 |
Family
ID=37660156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520059310 Expired - Fee Related CN2862527Y (en) | 2005-06-07 | 2005-06-07 | Theft-using protection alarming device for telephone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2862527Y (en) |
-
2005
- 2005-06-07 CN CN 200520059310 patent/CN2862527Y/en not_active Expired - Fee Related
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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 |