CN2211678Y - Telephone circuit protector - Google Patents
Telephone circuit protector Download PDFInfo
- Publication number
- CN2211678Y CN2211678Y CN 94237609 CN94237609U CN2211678Y CN 2211678 Y CN2211678 Y CN 2211678Y CN 94237609 CN94237609 CN 94237609 CN 94237609 U CN94237609 U CN 94237609U CN 2211678 Y CN2211678 Y CN 2211678Y
- Authority
- CN
- China
- Prior art keywords
- circuit
- telephone
- triode
- oscillator
- protector
- 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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- Devices For Supply Of Signal Current (AREA)
Abstract
The utility model discloses a telephone circuit protector composed of the connection of a polarity protective circuit, an operating circuit and a power circuit. The input end of the polarity protective circuit is connected with the local telephone line, and the output end of the polarity protective circuit is connected with the power circuit. The power circuit is connected with the operating circuit. The operating circuit is composed of the connection of resistor, a transistor, an optical coupler, an oscillator and capacitance. The output end of the oscillator is connected with the transistor, and is connected with the output end of the polarity protective circuit via the feedback resistor of the transistor. The input end of the optical coupler is connected with the input end of the telephone set of the validated user. The telephone circuit protector has the advantages of reasonable structure, and can efficiently restrict the telephone use of illegal user, and protects the telephone line not to be embezzled. The telephone circuit protector is a rare telephone circuit protector.
Description
The utility model belongs to the anti-protector of usurping of a kind of telephone line.
The present telephone line protector that uses; generally be used in the superpotential protection more; and at random and in disabled user's telephone set of telephone line; also there is not special protector to be limited; usually monitor, investigate and prosecute by main exchange; because administration face is big and randomness, is difficult to the use of the strong disabled user of strike telephone set.
The purpose of this utility model is to provide a kind of telephone line protector, with the use of restriction disabled user telephone set.
The utility model is connected and composed by polar protective circuit, operating circuit, power circuit.The input termination local telephone of polar protective circuit; its output is connected with power circuit; power circuit is connected with operating circuit again; operating circuit is connected and composed by resistance, triode, photo coupler, oscillator, electric capacity; the output of oscillator is connected with triode; and the feedback resistance by triode is connected with the output of polar protective circuit, and the input of photo coupler is connected with the input of validated user telephone set.
Accompanying drawing is the utility model electrical block diagram.
Now further specify in conjunction with the accompanying drawings:
The utility model is connected and composed by polar protective circuit (1), operating circuit (2), power circuit (3).The input (4) of polar protective circuit (1) connects local telephone, and its output (5) is connected with power circuit (3), and power circuit (3) is connected with operating circuit (2) again; Polar protective circuit (1) is made of bridge heap rectification circuit; power circuit (3) is connected and composed by diode, electric capacity; operating circuit (2) is by resistance, a plurality of triode (6; 7; 8; 9), two photo couplers (10), oscillator (11), electric capacity connect and compose; oscillator (11) is formed by connecting by resistance, electric capacity, integrated package; its output (12) is connected with triode (9), and is connected with output (F) point of polar protective circuit (1) by the feedback resistance (13) of triode (9).(C, D) input with the validated user telephone set is connected the input of photo coupler (10).
Adjust resistance, when making the on-hook of validated user telephone set the current potential of anode (F) point greater than 15 volts, triode (6) conducting, this point (F) current potential is less than 15 volts during off-hook, triode (6) ends.Working condition is as follows:
When 1, the current potential of point (F) is greater than 15 volts, triode (6) conducting, triode (7,8) ends, oscillator (11) failure of oscillation, output (12) is a low level, and triode (9) ends, and the current potential of point (F) is constant.
When 2, the current potential of point (F) is less than 15 volts, triode (6) ends, triode (7) conducting: (1) is if the validated user telephone set is in off hook state, then the light-emitting diode of two photo couplers (10) must have one tunnel conducting, point (E) is a low level, and triode (8) ends, oscillator (11) failure of oscillation, triode (9) ends, and the current potential of point (F) is constant.(2) if disabled user's telephone set is in off hook state, and the validated user telephone set is in hook state, then photo coupler (10) ends, and point (E) is a high level, triode (8) conducting, oscillator (11) starting of oscillation, when output (12) was high level, triode (9) conducting was because the resistance of feedback resistance (13) is very little, cause the current potential of point (F) to reduce, make disabled user's telephone set can't normal talking.When output (12) is low level, triode (9) ends, at this moment operating circuit (2) detects electricity (F) current potential again, to judge the whether on-hook (promptly whether removing out from telephone line) of disabled user's telephone set, if not on-hook, then oscillator (11) keeps vibration, if on-hook, then oscillator (11) failure of oscillation.
The utility model is rational in infrastructure, can limit the use of disabled user's telephone set effectively, has protected telephone line not stolen, and do not influence the validated user telephone set simultaneously yet and normally call, be a rare telephone line protector.
Claims (2)
1, a kind of telephone line protector; connect and compose by polar protective circuit, operating circuit, power circuit; the input termination local telephone that it is characterized in that polar protective circuit; its output is connected with power circuit; power circuit is connected with operating circuit again; operating circuit is connected and composed by resistance, triode, photo coupler, oscillator, electric capacity; the output of oscillator is connected with triode; and the feedback resistance by triode is connected with the output of polar protective circuit, and the input of photo coupler is connected with the input of validated user telephone set.
2, telephone line protector according to claim 1; it is characterized in that polar protective circuit is made of bridge heap rectification circuit; power circuit is connected and composed by diode, electric capacity; operating circuit is connected and composed by resistance, triode, photo coupler, oscillator, electric capacity, and oscillator is formed by connecting by resistance, electric capacity and integrated package.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94237609 CN2211678Y (en) | 1994-06-17 | 1994-06-17 | Telephone circuit protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94237609 CN2211678Y (en) | 1994-06-17 | 1994-06-17 | Telephone circuit protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2211678Y true CN2211678Y (en) | 1995-11-01 |
Family
ID=33845254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94237609 Expired - Fee Related CN2211678Y (en) | 1994-06-17 | 1994-06-17 | Telephone circuit protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2211678Y (en) |
-
1994
- 1994-06-17 CN CN 94237609 patent/CN2211678Y/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 |