CN201174160Y - Residential entry line anti-theft alarm - Google Patents

Abstract

The utility model discloses an anti-theft alarm for residential entrance lines, which includes a voltage dividing circuit composed of resistors R1, R2 and capacitor C1, a full-wave rectifier circuit, a filter circuit, an electrolytic capacitor and includes resistors R3, R4, triode N1 and N2 switching circuit. The power supply provides power for the full-wave rectification circuit through the voltage divider circuit, and the full-wave rectification circuit is filtered by the filter circuit, and the diode D1 charges the electrolytic capacitor E1, and the electrolytic capacitor E1 provides power for the buzzer FMQ through the switch circuit. The utility model does not call the police when the residents have electricity, but gives an alarm when the residents have a power outage, so as to remind the residents of the power outage at home, so that the residents can call the police to the power supply unit as soon as possible, and prevent the residents from being stolen of the wires and cables entering the house in time. The sound alarm can be delayed to more than 10 seconds, which is enough to wake up residents at night. It has long alarm time, high reliability and low power consumption.

Description

Residential entry line anti-theft alarm

1. Technical field

The utility model relates to an anti-theft alarm device for residential wires.

2. Background technology

The electric wires that enter the residential households, especially the cables, are often stolen, which not only brings troubles of power outages to the residential users, but also increases the maintenance workload and expense losses to the power supply units. Because the theft of wires and cables usually occurs at night, and the wires must be cut first, the resident users of this line will inevitably have a power outage. Therefore, the power supply unit hopes that once the power outage occurs at night, the residents can contact them as soon as possible, so that they can check the cause of the power outage in time, and timely Prevent theft and prevent wires and cables from being stolen. But people are sleeping at night and don't know when the power goes out, so it's hard to achieve preventive behavior.

3. Contents of the invention

The purpose of this utility model is to solve the above-mentioned problems existing in the prior art, to provide a kind of anti-theft alarm for residents who can automatically alarm after a power failure and wake up residents.

In order to accomplish the above object, the technical solution of the present utility model is: a kind of burglar alarm for the residential entrance line of residents, which includes a voltage divider circuit, a full-wave rectifier circuit, a filter circuit, an electrolytic capacitor E1 and includes resistors R3, R4 and a triode N1 and N2 switching circuit; the voltage divider circuit is composed of resistors R1, R2, and capacitor C1. After one end of the power supply passes through the parallel resistor R1 and capacitor C1, one end of the series resistor R2 is connected to the other end of the power supply, and the other is connected to the full wave One input end of the rectification circuit, the other input end of the full-wave rectification circuit is connected to the other end of the power supply, the two output ends of the full-wave rectification circuit are respectively connected to both ends of the capacitor C2 of the filter circuit, and one output end of the full-wave rectification circuit After the terminal is also connected to the diode D1, it is connected to the positive pole of the electrolytic capacitor E1. This output terminal is also connected to the base pole of the triode N1 through the resistor R3. The negative pole of the electrolytic capacitor E1 is connected to the other output terminal of the full-wave rectification circuit. The two routes are respectively connected to the emitters of the triode N1 and N2, the positive pole of the electrolytic capacitor E1 is connected to the buzzer FMQ, and the other is connected to the collector of the triode N1 after passing through the resistor R4, and the collector of the triode N1 is also connected to the collector of the triode N2. The base and the collector of the transistor N2 are connected to the buzzer FMQ.

The above-mentioned full-wave rectification circuit of the present invention is a bridge rectification circuit A1 composed of diodes.

The full-wave rectification circuit of the utility model takes the voltage at both ends of the resistor R2, filters it through the capacitor C2 after rectification, and then charges the electrolytic capacitor E1 through the diode D1. When the electrolytic capacitor E1 is fully charged, the power storage work for power failure alarm is completed. When the residents have electricity, the DC voltage filtered by the capacitor C2 is divided by the resistor R3, and then added to the base of the transistor N1, so that the base of the transistor N1 is at a high level, the transistor N1 is turned on, and the transistor N1 is turned on. The base voltage of the transistor N2 is pulled down, so that the transistor N2 is turned off, so that the path of the buzzer FMQ is closed, and the buzzer FMQ does not sound. When the residents lose power, the base of the transistor N1 is at a low level, causing the transistor N1 to be turned off. At this time, under the action of the resistor R4, the base of the transistor N2 becomes a high level, and the transistor N2 is turned on, and the circuit of the buzzer FMQ is connected. , the buzzer FMQ starts to sound the alarm until the charge of the energy storage capacitor E1 is discharged, generally between 10 seconds and 30 seconds. In a word, the utility model does not alarm when the residents have electricity. When the residents have a power failure, the alarm can automatically send out a sound alarm to remind the residents of the power outage at home, so that the residents can call the police to the power supply unit as soon as possible, and prevent the residents from entering the house. steal. The sound alarm can be delayed to more than 10 seconds, which is enough to wake up residents at night. The alarm time is long and the reliability is high. The power consumption of the entire alarm circuit is within 0.05 watts, and the power consumption is low. The utility model can be used alone, preferably integrated in a night light, and used as a night light with an alarm function.

4. Description of drawings

Below in conjunction with accompanying drawing, the utility model will be further described:

Fig. 1 is the circuit schematic diagram of the utility model.

5. Specific implementation

As shown in Figure 1, this embodiment includes a voltage divider circuit composed of resistors R1, R2, and capacitor C1, a bridge rectifier circuit A1 composed of diodes, a filter circuit capacitor C2, an electrolytic capacitor E1, and resistors R3, R4, and transistors N1 and N2 switching circuit. One end of the 220V AC power supply is connected to the other end of the power supply after passing through the parallel resistor R1 and capacitor C1, and the other end is connected to an input terminal 1 of the bridge rectifier circuit A1, and the other input terminal of the bridge rectifier circuit The terminal 3 is connected to the other end of the power supply, and the two output terminals 2 and 4 of the bridge rectifier circuit A1 are respectively connected to the two ends of the capacitor C2 of the filter circuit. At the positive pole of the electrolytic capacitor E1, this output terminal 2 is also connected to the base pole of the triode N1 through the resistor R3, and the negative pole of the electrolytic capacitor E1 is connected to the other output terminal 4 of the bridge rectifier circuit A1, and the other two are respectively connected to the triode The emitters of N1 and N2, the positive pole of the electrolytic capacitor E1 are connected to the buzzer FMQ one way, and the other way is connected to the collector of the triode N1 after passing through the resistor R4, and the collector of the triode N1 is also connected to the base of the triode N2. The collector is connected to the buzzer FMQ.

Claims (2)

1, a kind of resident's house lead in burglar alarm is characterized in that: it comprises bleeder circuit, full-wave rectifying circuit, filtering circuit, electrochemical capacitor E1 and comprises the on-off circuit of resistance R 3, R4 and triode N1 and N2; Bleeder circuit is by resistance R 1, R2, capacitor C 1 is formed, after one end of power supply passes through parallel resistor R1 and capacitor C 1, be connected the other end of power supply behind one tunnel resistance in series R2, another road is connected an input end of full-wave rectifying circuit, another input end of full-wave rectifying circuit is connected the other end of power supply, two output terminals of full-wave rectifying circuit are connected to the two ends of the capacitor C 2 of filtering circuit, one output terminal of full-wave rectifying circuit is also along after meeting diode D1, be connected the positive pole of electrochemical capacitor E1, this output terminal also is connected the base stage of triode N1 by resistance R 3, the negative pole one tunnel of electrochemical capacitor E1 connects another output terminal of full-wave rectifying circuit, two-way is connected to the emitter of triode N1 and N2 in addition, the positive pole one tunnel of electrochemical capacitor E1 connects hummer FMQ, another road is connected the collector of triode N1 after by resistance R 4, the collector of triode N1 also is connected the base stage of triode N2, and the collector of triode N2 is connected on the hummer FMQ.

2, resident's house lead in burglar alarm according to claim 1 is characterized in that: described full-wave rectifying circuit is the bridge rectifier circuit A1 that is constituted by a diode.