CN202049566U - Loop antitheft protection circuit - Google Patents
Loop antitheft protection circuit Download PDFInfo
- Publication number
- CN202049566U CN202049566U CN2011200277374U CN201120027737U CN202049566U CN 202049566 U CN202049566 U CN 202049566U CN 2011200277374 U CN2011200277374 U CN 2011200277374U CN 201120027737 U CN201120027737 U CN 201120027737U CN 202049566 U CN202049566 U CN 202049566U
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- CN
- China
- Prior art keywords
- circuit
- loop
- comparator
- comparison
- alarm control
- 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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- Burglar Alarm Systems (AREA)
Abstract
The present utility model discloses a loop antitheft protection circuit which comprises a sampling circuit, a reference circuit, a comparison circuit and an alarm control circuit. The sampling circuit is used for providing state signals of the protection circuit to the comparison circuit, the reference circuit is used for providing comparison signals needed by comparison to the comparison circuit, and the comparison circuit is used for indicating the state of the protection circuit according to the input conditions of the sampling circuit and the reference circuit. The alarm control circuit is operated according to the different output states of the comparison circuit, when a loop is destroyed, an alarm is given out instantly by the alarm control circuit, since a detection resistor is connected in series in the loop, the method of simply connecting damaged parts of the loop with conducting wires or cutting off the loop is of no use, thus the aim of warning thieves can be effectively realized.
Description
Technical field
The utility model relates to a kind of loop anti-theft protection circuit.
Background technology
Stolen phenomenon often appears in the countryside circuit, and the one, destroy the circuit normal power supply, influence productive life; The 2nd, when the robber steals electric operation, there is certain potential safety hazard.Prior art also has when detecting loop to be destroyed, and the caution robber promptly reports to the police; But when the robber couples together the loop breakage with lead or simply loop cut off, then alerting signal disappears; Be that prior art can not effectively solve the antitheft problem of loop.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of loop anti-theft protection circuit, and this circuit is reported to the police after detecting loop and being destroyed immediately; And the robber couples together the loop breakage with lead simply or simply loop is cut off, and reports to the police still to continue.
For achieving the above object, following technical scheme is adopted in the invention:
A kind of loop anti-theft protection circuit comprises sample circuit, reference circuit, comparator circuit and alarm control circuit;
Described sample circuit is used for providing to comparator circuit the status signal of holding circuit;
Described reference circuit is used for providing the comparison that relatively needs signal to comparator circuit;
Described comparator circuit indicates the state of holding circuit according to the input condition of sample circuit and reference circuit;
The output state that described alarm control circuit is different according to comparator circuit moves.
Be better implement the invention, described reference circuit comprises that short-circuit ratio is than the reference circuit and the benchmark circuit that opens circuit.
Be better implement the invention, described comparator circuit comprises the short circuit comparator circuit and the comparator circuit that opens circuit.
Be better implement the invention, described alarm control circuit comprises alarm control circuit, ann reset circuit, warning driving circuit and warning self-hold circuit.
During concrete enforcement, sample circuit is sampled to holding circuit, and the signal that comparator circuit comes the sample circuit sampling and the reference signal of reference circuit output are relatively.When short-circuit conditions appearred in holding circuit, the short circuit comparator circuit can output signal arrive warning circuit, and warning circuit sends alerting signal; When open circuit conditions appearred in holding circuit, the comparator circuit that opens circuit can output signal arrive warning circuit, and warning circuit also can send alerting signal.
Owing to adopted aforesaid technical scheme, the invention has following beneficial effect:
The characteristics of the loop anti-theft protection circuit of the invention are: as long as loop is destroyed, warning circuit just sends warning immediately; One is detected resistance owing to connected in loop, just with lead the loop breakage is coupled together simply or simply loop is cut off, of no avail fully.Thereby effectively warn the robber.
Description of drawings
Fig. 1 is the structural representation that the utility model inserts electric power system;
Fig. 2 is an electrical schematic diagram of the present utility model;
Embodiment
In conjunction with Fig. 1 and Fig. 2, constitute the loop with a four high guaily unit chip LM324 (IC1) and a small amount of discrete component, ICl only uses wherein two amplifier IC1A and IC1B to constitute voltage comparator.Resistance R and R1 are depressed into 6V with 12V power supply average mark, the anti-phase pin of delivering to amplifier IC1A again 2. with the homophase pin of amplifier IC1B 5.; The homophase pin of IC1A 3. at ordinary times voltage be lower than 6V, the anti-phase pin of IC1B 6. at ordinary times voltage then be higher than 6V; Under the normal condition, the output of two amplifiers is electronegative potential.
When the robber in protected location outside during with the loop short circuit, the output of amplifier IC1A just uprises, transistor T l conducting, circuit sends warning after the relay R Ll adhesive.In like manner, as the robber loop is disconnected, amplifier IC1B output just uprises, and transistor T 2 conductings make the relay adhesive equally and send warning.
RL1 adopts the relay of 12V, double-contact type, and should there be the suitable current capacity contact.Circuit supply can adopt 12V battery or 12V voltage stabilizing AC adapter.Before circuit connects power supply, answer the printed board of scrutiny welding whether correct and firm.First contact of relay is connected to the 220V emergency alarm bell, and second contact is connected to the reset switch Sl on the box panel outside the circuit, finishes loop with thin plain conductor and connects; Need during connection loop is connected with detecting resistance R, and R is placed in the protected location.
Claims (4)
1. a loop anti-theft protection circuit comprises sample circuit, reference circuit, comparator circuit and alarm control circuit;
Described sample circuit is used for providing to comparator circuit the status signal of holding circuit;
Described reference circuit is used for providing the comparison that relatively needs signal to comparator circuit;
Described comparator circuit indicates the state of holding circuit according to the input condition of sample circuit and reference circuit;
The output state that described alarm control circuit is different according to comparator circuit moves.
2. loop anti-theft protection circuit according to claim 1 is characterized in that: described reference circuit comprises that short-circuit ratio is than the reference circuit and the benchmark circuit that opens circuit.
3. loop anti-theft protection circuit according to claim 1 is characterized in that: described comparator circuit comprises the short circuit comparator circuit and the comparator circuit that opens circuit.
4. loop anti-theft protection circuit according to claim 1, it is characterized in that: described alarm control circuit comprises alarm control circuit, ann reset circuit, warning driving circuit and warning self-hold circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200277374U CN202049566U (en) | 2011-01-27 | 2011-01-27 | Loop antitheft protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200277374U CN202049566U (en) | 2011-01-27 | 2011-01-27 | Loop antitheft protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202049566U true CN202049566U (en) | 2011-11-23 |
Family
ID=44989867
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200277374U Expired - Fee Related CN202049566U (en) | 2011-01-27 | 2011-01-27 | Loop antitheft protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202049566U (en) |
-
2011
- 2011-01-27 CN CN2011200277374U patent/CN202049566U/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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111123 Termination date: 20130127 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |