CN205230229U

CN205230229U - Alarm

Info

Publication number: CN205230229U
Application number: CN201520989877.8U
Authority: CN
Inventors: 张湘杰; 郑道
Original assignee: GUANGZHOU JIANCHEM AUTO ACCESSORIES CO Ltd
Current assignee: GUANGZHOU JIANCHEM AUTO ACCESSORIES CO Ltd
Priority date: 2015-12-01
Filing date: 2015-12-01
Publication date: 2016-05-11
Anticipated expiration: 2025-12-01

Abstract

The utility model discloses an alarm, including warning trigger circuit, power amplification circuit, loudspeaker and power, warning trigger circuit includes audio output circuit and the thimble of being connected with door and window, the one end of thimble with the power electricity is connected, the other end of thimble with the input electricity of audio output circuit is connected, the output of audio output circuit with power amplification circuit's input electricity is connected, power amplification circuit's output with the loudspeaker electricity is connected, power amplification circuit's input still with the power electricity is connected. Adopt the embodiment of the utility model provides a, it is high to consume low battery and security.

Description

A kind of alarm

Technical field

The utility model relates to electronic technology field, particularly relates to a kind of alarm.

Background technology

At present, the door and window alarm kind on market is very many, but major part is the composite aircraft of infrared emission, or infrared monitoring formula.It is trigger alarm that this two classes alarm can disturb by human body in the separated rear generation warning of composite aircraft or infrared monitoring signal.But this two classes alarm all needs standby, needs standby power to be in detected state at any time.Although standby power is low, battery is still lossy, need regularly replace the battery of the inside to maintain the work of alarm.After electricity in the battery exhausts, user does not change battery in time, and alarm quits work, and thief cannot be reported to the police through out-of-date, meanwhile, treats that chance causes the wasting of resources and potential safety hazard.

Summary of the invention

Technical problem to be solved in the utility model is, provides a kind of alarm, and power consumption is low and security is high.

For solving above technical matters, the utility model embodiment provides a kind of alarm, comprises alarm trigger circuit, power amplification circuit, loudspeaker and power supply; The thimble that described alarm trigger circuit comprises audio output circuit and is connected with door and window;

One end of described thimble is connected with described power electric, the other end of described thimble and the input end electrical connection of described audio output circuit, the output terminal of described audio output circuit and the input end electrical connection of described power amplification circuit, the output terminal of described power amplification circuit and the electrical connection of described loudspeaker; The input end of described power amplification circuit is also connected with described power electric.

Further, described audio output circuit comprises audio frequency pio chip U1; Described audio frequency pio chip U1 comprises power input VDD and audio signal output end b;

One end electrical connection of described power input VDD and described thimble, the input end electrical connection of described audio signal output end b and described power amplification circuit.

Further, described audio output circuit also comprises the first switch S 1, second switch S3 and the 3rd switch S 4; Described audio frequency pio chip U1 also comprises first mode selecting side SEL1 and the second mode selection terminal SEL2;

One end and the described second mode selection terminal SEL2 of described first switch S 1 are electrically connected, and the other end and the described power input VDD of described first switch S 1 are electrically connected; One end and the described first mode selecting side SEL1 of described second switch S3 are electrically connected, and the other end and the described power input VDD of described second switch S3 are electrically connected; One end and the described first mode selecting side SEL1 of described 3rd switch S 4 are electrically connected, the other end ground connection of described 3rd switch S 4.

Further, described audio output circuit also comprises resistance R1; Described audio frequency pio chip U1 also comprises first frequency control end OSC1 and second frequency control end OSC2;

One end and the described first frequency control end OSC1 of described resistance R1 are electrically connected, and the other end and the described second frequency control end OSC2 of described resistance R1 are electrically connected.

Further, described power amplification circuit comprises audio frequency amplification chip U2; Described audio frequency amplification chip U2 comprises audio signal input end INL, high level output end OUT_L+ and low level output end OUT_L-;

Audio signal output end b and the described audio signal input end INL of described audio frequency pio chip U1 are electrically connected, and the positive pole electrical connection of described high level output end OUT_L+ and described loudspeaker, described low level output end OUT_L-is connected with the negative electricity of described loudspeaker.

The alarm that the utility model embodiment provides, thimble and door and window physical connection can be made, when door and window is opened, alarm trigger circuit switches on power, and then output audio signal is to power amplification circuit, send chimes of doom to control loudspeaker, when circuit does not work without the need to loss power supply, thus reduce power consumption and improve security.

Accompanying drawing explanation

Fig. 1 is the structural representation of an embodiment of the alarm that the utility model provides;

Fig. 2 is the structural representation of an embodiment of alarm trigger circuit in the alarm that provides of the utility model;

Fig. 3 is the structural representation of an embodiment of power amplification circuit in the alarm that provides of the utility model.

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described.

See Fig. 1, it is the structural representation of an embodiment of the alarm that the utility model provides.

The present embodiment provides a kind of alarm, comprises alarm trigger circuit 1, power amplification circuit 2, loudspeaker 3 and power supply 4; The thimble 12 that described alarm trigger circuit 1 comprises audio output circuit 11 and is connected with door and window;

One end and the described power supply 4 of described thimble 12 are electrically connected, the other end of described thimble 12 and the input end electrical connection of described audio output circuit 11, the output terminal of described audio output circuit 11 and the input end electrical connection of described power amplification circuit 2, output terminal and the described loudspeaker 3 of described power amplification circuit 2 are electrically connected; The input end of described power amplification circuit 2 is also electrically connected with described power supply 4.

It should be noted that, in alarm trigger circuit 1, the top of thimble 12 is fixed on the frame of door and window by steel wire or cord.When thief opens door or window, the pull-out of thimble can be driven, make audio output circuit 11 switch on power 4, audio output circuit 11 output audio signal after power up, sound signal transfers to loudspeaker 3 after being amplified by signal by power amplification circuit 2, and loudspeaker 3 carry out reminding user by sending chimes of doom.When thimble is not drawn out, circuit is not connected with power supply, without the need to loss power supply, thief open door and window illegally enter time, pull-out thimble, circuit is just connected with power supply reports to the police, thus reduces the loss of power and raising security.

Further, as shown in Figure 2, described audio output circuit 11 comprises audio frequency pio chip U1; Described audio frequency pio chip U1 comprises power input VDD and audio signal output end b;

Wherein, after thimble A1 is drawn out, power supply Battery powers to audio frequency pio chip U1, makes audio frequency pio chip U1 by audio signal output end b output audio signal to power amplification circuit.Wherein, audio frequency pio chip U1 inside is integrated with storer and demoder, thus directly can pass through audio signal output end b output audio signal.

Wherein, the first switch S 1, second switch S3 and the 3rd switch S 4 can control the first mode selecting side SEL1 of audio frequency pio chip U1 and the height of the second mode selection terminal SEL2 place level by switch, thus control loudspeaker send different alarm sounds.

Wherein, the resistance by changing resistance R1 changes the frequency that loudspeaker send chimes of doom.

Further, as shown in Figure 3, described power amplification circuit comprises audio frequency amplification chip U2; Described audio frequency amplification chip U2 comprises audio signal input end INL, high level output end OUT_L+ and low level output end OUT_L-;

Wherein, the audio signal input end INL of power amplification circuit, after input audio signal, carries out amplification process to this sound signal, then exports loudspeaker Speaker to by high level output end OUT_L+ and low level output end OUT_L-.Wherein, the loudspeaker of audio frequency amplification chip U2 and left and right two sound channels are connected, but in the present embodiment, audio frequency amplification chip U2 only uses L channel port to be connected with L channel loudspeaker, thus control the work of L channel loudspeaker.

The above is preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the utility model principle; can also make some improvements and modifications, these improvements and modifications are also considered as protection domain of the present utility model.

Claims

1. an alarm, is characterized in that, comprises alarm trigger circuit, power amplification circuit, loudspeaker and power supply; The thimble that described alarm trigger circuit comprises audio output circuit and is connected with door and window;

2. alarm as claimed in claim 1, it is characterized in that, described audio output circuit comprises audio frequency pio chip U1; Described audio frequency pio chip U1 comprises power input VDD and audio signal output end b;

3. alarm as claimed in claim 2, it is characterized in that, described audio output circuit also comprises the first switch S 1, second switch S3 and the 3rd switch S 4; Described audio frequency pio chip U1 also comprises first mode selecting side SEL1 and the second mode selection terminal SEL2;

4. alarm as claimed in claim 2, it is characterized in that, described audio output circuit also comprises resistance R1; Described audio frequency pio chip U1 also comprises first frequency control end OSC1 and second frequency control end OSC2;

5. the alarm as described in any one of claim 2 to 4, is characterized in that, described power amplification circuit comprises audio frequency amplification chip U2; Described audio frequency amplification chip U2 comprises audio signal input end INL, high level output end OUT_L+ and low level output end OUT_L-;