CN106408811B - Thief-proof electric alarm circuit - Google Patents

Abstract

The invention belongs to the technical fields of warning circuit, and in particular to thief-proof electric alarm circuit；The technical issues of solution is：There is provided one kind being capable of easy for installation, the lower power circuit of cost Keep Clear-High Voltage warning alert circuit；The technical solution used for：Thief-proof electric alarm circuit, including contact sensor, control chip, relay KJ1 and control circuit board, the control circuit board is equipped with power circuit, regulator circuit and control circuit, the output end of the contact sensor is connected with the input terminal of control chip, the output end of the control chip is connected by relay KJ1 with the input terminal of power circuit, the output end of power circuit is connected with the input terminal of regulator circuit, and the output end of the regulator circuit is connected with the input terminal of control circuit；The present invention is suitable for power domain.

Description

Anti-theft alarm circuit

technical field

The invention belongs to the technical field of alarm circuits, and in particular relates to an anti-stealing alarm circuit.

Background technique

At present, electric meters need to be installed in municipalities, residential areas, telecommunications, electric power, rural power grids, factories, enterprises, institutions, heating, fire protection, and other public facilities, and a meter box is required. The meter box is generally a terminal along the power facility to the household. For laying, each household needs a meter box, that is, a set of electric meter box shells, so the consumption is huge. However, many people take risks and steal electricity in various ways to reduce the amount of personal electricity bill payment. Among them, the phenomenon of transforming electric energy meters is particularly prominent, which has caused great economic losses to the power supply industry and seriously disrupted the normal power supply of the country. order. Effectively preventing electricity theft is of great significance to saving energy and protecting the rights and interests of the power supply department. Continuously improving the anti-theft technology of electric energy meters is also a concern of the power supply department and the public.

Contents of the invention

The invention overcomes the deficiencies in the prior art, and the technical problem to be solved is: to provide an anti-stealing electricity alarm circuit which is easy to use and low in cost.

In order to solve the above technical problems, the technical solution adopted in the present invention is: an anti-theft alarm circuit, including a contact sensor, a control chip, a relay KJ1 and a control circuit board, and the control circuit board is provided with a power supply circuit, a voltage stabilizing circuit and a control circuit circuit, the output end of the touch sensor is connected to the input end of the control chip, the output end of the control chip is connected to the input end of the power supply circuit through the relay KJ1, and the output end of the power supply circuit is connected to the input end of the voltage stabilizing circuit, so The output terminal of the voltage stabilizing circuit is connected with the input terminal of the control circuit;

The power supply circuit includes an inductor L1 and a bridge rectifier T1, the voltage stabilizing circuit includes a diode D1, a diode D2, a diode D3, a diode D4, a capacitor C7 and a capacitor C8, and the control circuit includes an NPN transistor Q1, an NPN transistor Q2 and a buzzer device M1.

One end of the normally closed contact KJ1.1 of the relay KJ1 is connected to the positive pole of the power supply, the other end of the normally closed contact KJ1.1 of the relay KJ1 is connected in series with a resistor R1 and connected to one end of the inductor L1, and the other end of the inductor L1 One end of the capacitor C2 is connected to the positive input terminal of the bridge rectifier T1, the other end of the capacitor C2 is connected to the negative input terminal of the bridge rectifier T1 and the negative pole of the power supply, and the capacitor C1 is connected in parallel to both ends of the resistor R1;

The positive output end of the bridge rectifier T1 is connected to one end of the capacitor C7, the other end of the capacitor C7 is connected to the negative pole of the diode D1 and the positive pole of the diode D2, the negative pole of the diode D2 is connected to the positive pole of the diode D3, one end of the capacitor C8, the resistor One end of R2, one end of resistor R3, and the collector of NPN transistor Q2 are connected, the cathode of diode D3 is connected to the anode of diode D4, the other end of resistor R2 is connected to the base of NPN transistor Q1, and the collector of NPN transistor Q1 The electrode is connected to the other end of the resistor R3 and the base of the NPN transistor Q2, the emitter of the NPN transistor Q2 is connected to one end of the buzzer M1, and the other end of the buzzer M1 is connected to the emitter of the NPN transistor Q1, the capacitor The other end of C8, the cathode of diode D4, the anode of diode D1 and the output negative terminal of bridge rectifier T1 are connected.

Compared with the prior art, the present invention has the following beneficial effects:

The anti-stealing alarm circuit of the present invention includes a contact sensor, a control chip, a relay KJ1 and a control circuit board. The control circuit board is provided with a power circuit, a voltage stabilizing circuit and a control circuit; the contact sensor senses external signals in real time, and when a person approaches , the contact sensor detects the signal and sends the signal to the control chip, the control chip controls the normally closed contact KJ1.1 of the relay KJ1 to disconnect, the NPN transistor Q1 changes from conduction to cut-off, and the NPN transistor Q2 changes from cut-off to conduction, the buzzer M1 sends out an alarm sound, and the present invention can play a warning role, prompting the approaching personnel to evacuate in time.

Description of drawings

Below in conjunction with accompanying drawing, the present invention is described in further detail;

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the circuit structural diagram of control circuit board of the present invention;

In the figure: 1 is a touch sensor, 2 is a control chip, 3 is a control circuit board, 4 is a power supply circuit, 5 is a voltage stabilizing circuit, and 6 is a control circuit.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, rather than All the embodiments; based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative work all belong to the protection scope of the present invention.

As shown in Figure 1 and Figure 2, the anti-theft alarm circuit includes a contact sensor 1, a control chip 2, a relay KJ1 and a control circuit board 3, and the control circuit board 3 is provided with a power supply circuit 4, a voltage stabilizing circuit 5 and Control circuit 6, the output end of the touch sensor 1 is connected to the input end of the control chip 2, the output end of the control chip 5 is connected to the input end of the power supply circuit 1 through the relay KJ1, and the output end of the power supply circuit 4 is connected to the voltage regulator The input end of the circuit 5 is connected, and the output end of the voltage stabilizing circuit 5 is connected with the input end of the control circuit 6;

The power supply circuit 4 includes an inductor L1 and a bridge rectifier T1, the voltage stabilizing circuit 5 includes a diode D1, a diode D2, a diode D3, a diode D4, a capacitor C7 and a capacitor C8, and the control circuit 6 includes an NPN transistor Q1 and an NPN transistor Q2 and buzzer M1.

One end of the normally closed contact KJ1.1 of the relay KJ1 is connected to the positive pole of the power supply, the other end of the normally closed contact KJ1.1 of the relay KJ1 is connected in series with a resistor R1 and connected to one end of the inductor L1, and the other end of the inductor L1 One end of the capacitor C2 is connected to the positive input terminal of the bridge rectifier T1, the other end of the capacitor C2 is connected to the negative input terminal of the bridge rectifier T1 and the negative pole of the power supply, and the capacitor C1 is connected in parallel to both ends of the resistor R1;

The positive output end of the bridge rectifier T1 is connected to one end of the capacitor C7, the other end of the capacitor C7 is connected to the negative pole of the diode D1 and the positive pole of the diode D2, the negative pole of the diode D2 is connected to the positive pole of the diode D3, one end of the capacitor C8, the resistor One end of R2, one end of resistor R3, and the collector of NPN transistor Q2 are connected, the cathode of diode D3 is connected to the anode of diode D4, the other end of resistor R2 is connected to the base of NPN transistor Q1, and the collector of NPN transistor Q1 The electrode is connected to the other end of the resistor R3 and the base of the NPN transistor Q2, the emitter of the NPN transistor Q2 is connected to one end of the buzzer M1, and the other end of the buzzer M1 is connected to the emitter of the NPN transistor Q1, the capacitor The other end of C8, the cathode of diode D4, the anode of diode D1 and the output negative terminal of bridge rectifier T1 are connected.

In the anti-stealing alarm circuit of the present invention, the circuit is installed on the top of the utility pole. During normal use, the power supply voltage is applied to the base of the NPN transistor Q1 through the normally closed contact KJ1.1 of the relay KJ1, so that the NPN The NPN transistor Q1 is turned on, so the base potential of the NPN transistor Q2 is pulled down, the NPN transistor Q2 is cut off, and the buzzer M1 does not work;

The anti-stealing alarm circuit of the present invention, during normal use, the power supply voltage is added to the base of the NPN transistor Q1 through the normally closed contact KJ1.1 of the relay KJ1, so that the NPN transistor Q1 is turned on, so the NPN The base potential of the NPN transistor Q2 is pulled down, the NPN transistor Q2 is cut off, and the buzzer M1 does not work;

When someone touches the meter box, the contact sensor 1 detects the signal and sends the signal to the control chip 2, the control chip 2 controls the normally closed contact KJ1.1 of the relay KJ1 to disconnect, the power supply is cut off, and the NPN transistor Q1 is activated The conduction becomes cut-off, the NPN transistor Q2 changes from cut-off to conduction, and the buzzer M1 sends out an alarm sound.

The anti-stealing alarm circuit of the present invention integrates the power supply circuit 4, the voltage stabilizing circuit 5 and the control circuit 6 on the control circuit board 3, has a simple structure, low cost, and can serve as a warning to remind people who want to steal electricity Evacuate in time to avoid unnecessary losses.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (1)

1. thief-proof electric alarm circuit, it is characterised in that：Including contact sensor（1）, control chip（2）, relay KJ1 and control Circuit board（3）, the control circuit board（3）It is equipped with power circuit（4）, regulator circuit（5）And control circuit（6）, described to connect Touch sensor（1）Output end with control chip（2）Input terminal be connected, the control chip（2）Output end pass through relay Device KJ1 and power circuit（4）Input terminal be connected, power circuit（4）Output end and regulator circuit（5）Input terminal be connected, The regulator circuit（5）Output end and control circuit（6）Input terminal be connected；

The power circuit（4）Including inductance L1 and bridge rectifier T1, regulator circuit（5）Including diode D1, diode D2, Diode D3, diode D4, capacitance C7 and capacitance C8, control circuit（6）Including NPN type triode Q1, NPN type triode Q2 and Buzzer M1；

One end of the normally-closed contact KJ1.1 of the relay KJ1 is connected with power supply anode, the normally-closed contact of relay KJ1 It is connected with one end of inductance L1 after the other end series resistor R1 of KJ1.1, the other end of inductance L1 and one end of capacitance C2, bridge-type The input positive terminal of rectifier T1 is connected, and the other end of the capacitance C2 and the input negative terminal of bridge rectifier T1, power supply are negative Extremely it is connected, the capacitance C1 is connected in parallel on the both ends of resistance R1；

The output plus terminal of the bridge rectifier T1 is connected with one end of capacitance C7, the other end of capacitance C7 and bearing for diode D1 Pole, diode D2 anode be connected, the cathode of diode D2 and the anode of diode D3, one end of capacitance C8, resistance R2 one End, one end of resistance R3, the collector of NPN type triode Q2 are connected, and the cathode of diode D3 is connected with the anode of diode D4, The other end of resistance R2 is connected with the base stage of NPN type triode Q1, and the collector of NPN type triode Q1 is another with resistance R3's End, the base stage of NPN type triode Q2 are connected, and the emitter of NPN type triode Q2 is connected with one end of buzzer M1, buzzer M1 The other end and the emitter of NPN type triode Q1, the other end of capacitance C8, the cathode of diode D4, diode D1 anode It is connected with the output negative terminal of bridge rectifier T1.