CN2145413Y - Doorbell capable of being used as anti-theft alarm at night - Google Patents

Abstract

The utility model discloses a can double as burglar alarm's doorbell, especially a can be at the doorbell that automatic switch got into alert state night. The device mainly comprises a switch circuit, an astable circuit, an audio signal generating circuit and a buzzer. The main characteristic is that the original doorbell circuit and the alarm circuit are organically combined together, which is beneficial to saving elements and reducing cost. Meanwhile, the switch circuit can be formed by photosensitive elements, can automatically transfer the state of the doorbell according to the intensity of light, and has the advantage of more convenient use.

Description

Door bell cabable as anti-theft siren on night

But the utility model relates to a kind of electronic door bell of double as burglar alarm, the particularly a kind of doorbell that can change the state of alert at night automatically.

But sell the doorbell that a kind of double as burglar alarm is arranged on the existing market, it mainly is battery, loudspeaker and doorbell circuit to be coupled together or battery, loudspeaker and warning circuit are coupled together by a switch, making different circuit---doorbell circuit and warning circuit are shared same battery and same loudspeaker, this switch is arranged on the panel, people must stir switch at night, doorbell is on the alert, in the daytime then must turn back switch again, make doorbell recover common effect.

There is following deficiency in this burglar alarm doorbell:

At first, the same with existing other burglar alarm doorbells, its warning circuit partly is that integrated structure that independent employing can be sent the siren sound signal is taken and formed, thereby causes the increase of the whole cost price of product;

Secondly, when doorbell is on the alert, when promptly switch coupled together battery, loudspeaker and warning circuit, doorbell then can not be brought into play common cry effect;

Moreover this doorbell switch that must often fiddle with makes troubles to the user.

The purpose of this utility model is warning circuit and doorbell circuit organically to be combined and propose a kind of novel burglar alarm doorbell, it is integrated that this burglar alarm doorbell is removed the warning of usually being adopted from, and still remain with common cry effect under it is in state of warning.

The purpose of this utility model also is to be provided doorbell can be changed automatically and enter the state of alert night.

Its purpose realizes like this: this doorbell comprises that signal that astable circuit that a battery to doorbell power supply, on-off circuit, signal that provides according to on-off circuit vibrate, one provide according to astable circuit or extraneous button produces the audio signal generating circuit of sound signal and one transformer of conversion and the buzzer that sound signal that provides according to transformer is sent the sound are provided sound signal.Like this, when on-off circuit during according to the external condition conducting, the signal that produces will cause the astable circuit vibration as alerting signal, a series of square waves that audio signal generating circuit provides according to astable circuit will produce the sound signal of a series of interruptions, thereby, can obtain the sound of a series of interruptions from the buzzer, with this as chimes of doom, in addition, because no matter when, extraneous button all can provide signal to audio signal generating circuit, and the sound signal of generation makes buzzer send the sound, thereby no matter which kind of state doorbell is in, and all can keep the common cry effect of performance.

It is desirable to, the energy of on-off circuit system employing in the such scheme is changed the on off operating mode of this on-off circuit automatically and can be produced the back in this switch conduction, alerting signal according to the power of light and regularly attempt to make on-off circuit to recover the circuit of off state, elimination alerting signal.

Fig. 1 is a kind of concrete outside drawing of the utility model;

Fig. 2 is a kind of concrete circuit diagram of the utility model;

Fig. 3 is the another kind of concrete circuit diagram of the utility model.

The utility model is described in further detail below in conjunction with accompanying drawing:

With reference to the described doorbell of Fig. 1, comprise the button 1 that is fixed in outdoors, be loaded on behind the door with the magnetic switch 2 of doorframe and be loaded on indoor, in keep the shell 3 of circuit, wherein, button K ₁, K ₂Be arranged on the outside surface of shell 3.

With reference to circuit shown in Figure 2, wherein, on-off circuit comprises by transistor Q ₂, complex pipe Q ₁The switch basic circuit that constitutes and by resistance R ₁, magnetic switch, photoresistance, diode D ₁Constitute the threshold values change-over circuit of this basic circuit and by resistance R ₃, capacitor C ₁Constitute the ReSet Circuit of this basic circuit; Audio signal generating circuit is by integrated LM5201, transistor Q ₅, Q ₆And button K ₃Etc. formation.

Be the course of work of foregoing circuit major part below:

When the magnetic switch of on-off circuit breaks away from (according to above-mentioned setting, then door is opened), complex pipe Q ₁Conducting with by by A point current potential decision, when light becomes clear (be equivalent to daytime or night owner turn on light), photoresistance LDR resistance is very little, so A point current potential deficiency makes complex pipe Q ₁Conducting, transistor Q ₂Still end, the B point is an electronegative potential; (be equivalent to owner's light-off at night) when light is dark, the resistance of LDR increases, and A point current potential rises, when equaling or exceeding complex pipe Q ₁The critical conduction current potential time, complex pipe Q ₁Conducting, transistor Q ₂Also conducting, this moment, the B point presented noble potential, and with this alerting signal as on-off circuit output, meanwhile, the noble potential that B is ordered passes through resistance R ₃To capacitor C ₁Charging is simultaneously to complex pipe Q ₁Base current is provided, makes Q ₁Saturated, therefore, at this moment the thief closes door or owner turns on light and the photoresistance resistance is affected can not change complex pipe Q then ₁Conducting state, can not change transistor Q then ₂Conducting state, promptly the B point keeps noble potential, regulates resistance R ₃Resistance, make capacitor C ₁Duration of charging be about 60 seconds, like this, when charging finishes after 60 seconds, complex pipe Q ₁No base current and end transistor Q ₂Also end diode D thereupon ₃At Q ₂By the back is C ₁Discharge loop fast is provided, and subsequently, whether the B point presents that noble potential depends on again then whether magnetic switch disconnects and the photoresistance resistance is greatly whether bigger again, when owner shuts the door or turns on electric light, has then changed the condition that the B point continues to present noble potential.

This on-off circuit owing in the daytime enough light is arranged, makes that the resistance of photoresistance is very little, and therefore, even magnetic switch breaks away from, the current potential that A is ordered still deficiency makes complex pipe Q ₁Conducting, promptly switch is in off state all the time; Because night, light was darker, made the resistance of photoresistance bigger, as long as magnetic switch breaks away from, A point current potential rises at once and makes switch conduction, and just on-off circuit is on the alert doorbell, prepares to send warning at any time.

As the button K that presses audio signal generating circuit ₃The time, make the capacitor C that charges to supply voltage originally ₄Short circuit, at this moment, the H point presents electronegative potential, transistor Q ₅The positive potential of emitter is through emitter junction, diode D ₄, resistance R ₇To earth point formation electric current, make transistor BG ₅Saturated, provide operating voltage to integrated LM5201, the output terminal OUT output audio signal of integrated LM5201 and through transistor Q ₆Amplify.

Transistor Q ₃, Q ₄, capacitor C ₂, C ₃, resistance R ₄, R ₅, R ₁₀, R ₁₁The astable circuit of forming when the B point presents noble potential, then produces vibration, and from a series of square wave of F point output.

Below be the course of work of this doorbell:

1, when pressing the button K ₃The time, the sound signal of the output terminal OUT output of audio signal generating circuit is through transistor Q ₆Be added to after the amplification on the transformer, make buzzer take place " to sting through the sound signal of transformer conversion

" the sound.

2, when between night, when door was opened by the thief, the B point of on-off circuit presented noble potential, thereby caused the astable circuit vibration, and a series of square waves of exporting from the F point are added to audio signal generating circuit transistor Q ₅Base stage H point on, when the H point presented electronegative potential, audio signal generating circuit was output audio signal, and when the H point presents noble potential, transistor Q ₅End, therefore LM5201 absence of audio signal output owing to there is not operating voltage, can obtain the sound of a series of interruptions from the buzzer, until the external condition that changes on-off circuit.

In the such scheme, the cycle of regulating astable circuit is 05～1 second, make integrated LM5201 take place after sending " stining " sound " " before the sound, the F point has become noble potential by electronegative potential, makes transistor Q ₅End, cut off the power supply of LM5201, make "

" sound do not send, along with the oscillation frequency of astable circuit, by transistor Q ₅Repeated cutting is connected integrated, " stining ", " stining ", " stining " sound signal that integrated only output is continued, and like this, different sound will take place in buzzer, and especially a kind of sound different with the police car alarm is convenient to people's difference.

Astable circuit in the such scheme, its resistance R ₁₀, R ₁₁Can be respectively red, green light, make when reporting to the police, alternately flicker takes place in red, green light.Obviously, this will help making things convenient for the deaf person, also in another way to people's alarm, receive better effect simultaneously.

Consider from the integrality angle of product, can similarly connect a button switch K between the point at 2 at B, the G of foregoing circuit or other ₁, this button switch K ₁Be arranged on the panel, be used for test simulation and report to the police.

More reasonably be, at on-off circuit complex pipe Q ₁Base stage and ground between be connected to a button switch K ₂And be arranged on the panel, in dark, open door and make circuit alarm, after door is closed again or drawn back electric light, press the button K ₂, can end reporting to the police in advance.

Theft-defencing alarm door-bell of the present utility model, because warning circuit and doorbell circuit are organically combined, compared with prior art, have compact conformation, save the advantages such as element and cost price are low, simultaneously, under it is in the state of warning, still remain with common cry effect, the deficiencies in the prior art have been overcome, in addition, the utility model can also automatically be changed at night and enter the state of alert, brings convenience to users.

Claims (8)

1. But 1, a kind of night the double as burglar alarm doorbell, it is characterized in that it comprises:

   Battery to the doorbell power supply;

   An on-off circuit;

   The astable circuit that the signal that provides according to said switching circuit vibrates;

   A signal that provides according to above-mentioned astable circuit or extraneous button produces the audio signal generating circuit of sound signal;

   A transformer that above-mentioned sound signal is carried out conversion;

   An audio frequency that provides according to transformer sends the buzzer of the sound.
2. According to the doorbell of claim 1, it is characterized in that 2, described astable circuit its oscillation period is 0.5～1 second.
3. 3, according to the doorbell of claim 1 or 2, it is characterized in that described on-off circuit is that an energy is changed the on off operating mode of this on-off circuit automatically and can be produced the circuit that on-off circuit recovery off state, elimination alerting signal are regularly attempted to make in the back in this switch conduction, alerting signal according to the power of light.
4. According to the doorbell of claim 3, it is characterized in that 4, described on-off circuit comprises by transistor Q ₂, complex pipe Q ₁The switch basic circuit that constitutes and by resistance R ₁, magnetic switch, photoresistance, diode D ₁Constitute the threshold values change-over circuit of this basic circuit and by resistance R ₃Capacitor C ₁Constitute the ReSet Circuit of this basic circuit.
5. According to the doorbell of claim 4, it is characterized in that 5, described audio signal generating circuit is by integrated LM5201, transistor Q ₅, Q ₆And button K ₃Etc. formation.
6. 6, according to the doorbell of claim 5, it is characterized in that the resistance R of described astable circuit ₁₀, R ₁₁Be respectively red, green light bubble.
7. According to the doorbell of claim 6, it is characterized in that 7, the B of circuit, G or other similarly are connected with a button switch K between the point at 2 ₁
8. 8, according to the doorbell of claim 7, it is characterized in that, be connected with a button switch K between the complex pipe base stage of described on-off circuit and the ground ₂

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