CN206274336U - A kind of voltage alarm circuit for computer - Google Patents

Abstract

The utility model discloses a kind of voltage alarm circuit for computer, including diode D1, triode V2, electric capacity C1 and resistance R3, one end connection electric capacity C1 and 220V alternating current of the resistance R3, the other end of the other end connection electric capacity C1 of resistance R3 and the port 1 of rectifier bridge T, the port 2 of rectifier bridge T connects the contact K 1 of electric capacity C2 and relay K, the other end connection computer A of the contact K 1 of relay K, the anode of resistance R1 and diode D1.A kind of voltage alarm circuit structure for computer of the utility model is simple, component is few; in circuit there is provided voltage detection module; and the purpose of under-voltage protection is realized with reference to relay; circuit also has the function of alarm simultaneously, therefore has the advantages that low cost, control are accurate and easy to use.

Description

A kind of voltage alarm circuit for computer

Technical field

The utility model is related to a kind of warning circuit, specifically a kind of voltage alarm circuit for computer.

Background technology

With continuing to develop for power industry, increasing household electrical appliance enter ordinary people family, especially desk-top The live and work that computer, notebook computer etc. give people brings great convenience, and this kind of computer equipment is required to stabilization Power supply, it may be said that the stability of domestic electric network is directly connected to daily life, and power circuit is being transferred to family Often occur the phenomenons such as electromagnetic interference, power network fluctuation when power network, especially in the peak times of power consumption of summer, it is easy to cause There is under-voltage situation with electric loading, cause burning for computer, the most complex structure of traditional protection circuit, cost of manufacture Height, and function is more single.

Utility model content

The purpose of this utility model is to provide a kind of voltage alarm circuit for computer, to solve above-mentioned background skill The problem proposed in art.

To achieve the above object, the utility model provides following technical scheme：

A kind of voltage alarm circuit for computer, including diode D1, triode V2, electric capacity C1 and resistance R3, institute State one end connection electric capacity C1 and 220V alternating current of resistance R3, the other end and rectifier bridge of the other end connection electric capacity C1 of resistance R3 The port 1 of T, the port 2 of rectifier bridge T connects the contact K-1 of electric capacity C2 and relay K, the other end of the contact K-1 of relay K Connection computer A, the anode of resistance R1 and diode D1, the negative electrode connection resistance R2 of diode D1, resistance R4, electric capacity C3 and after The base stage of the other end connecting triode V1 of electrical equipment K, resistance R1, the other end of the emitter stage connection resistance R2 of triode V1, electricity Hold the port 4 of the other end, resistance R5, loudspeaker B, the colelctor electrode of triode V2 and the rectifier bridge T of the other end connection electric capacity C3 of C2, The base stage of the other end connecting triode V1 of resistance R1, the other end of the emitter stage connection resistance R2 of triode V1, resistance R4's The negative electrode and resistance R5 of other end connection diode D2, the base stage of the anode connecting triode V2 of diode D2, triode V2's The other end of emitter stage connection relay K.

As preferred scheme of the present utility model：The triode V1 and triode V2 are PNP triode.

As preferred scheme of the present utility model：The relay K is normally opened contact relay.

As preferred scheme of the present utility model：The rectifier bridge T is that the all-wave being made up of 4 IN4007 type diodes is whole Current circuit.

As preferred scheme of the present utility model：The resistance R3 and electric capacity C1 composition capacitance-resistance voltage reduction circuits.

Compared with prior art, the beneficial effects of the utility model are：A kind of voltage for computer of the utility model Warning circuit simple structure, component are few, voltage detection module are provided with circuit, and realized with reference to relay under-voltage The purpose of protection, while circuit also has the function of alarm, therefore has the advantages that low cost, control are accurate and easy to use.

Brief description of the drawings

Fig. 1 is a kind of circuit diagram of the voltage alarm circuit for computer.

Specific embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made The every other embodiment for being obtained, belongs to the scope of the utility model protection.

Refer to Fig. 1, a kind of voltage alarm circuit for computer, including diode D1, triode V2, electric capacity C1 and One end connection electric capacity C1 and 220V alternating current of resistance R3, the resistance R3, the other end connection electric capacity C1's of resistance R3 is another End and the port 1 of rectifier bridge T, the port 2 of rectifier bridge T connect the contact K-1, the contact K- of relay K of electric capacity C2 and relay K 1 other end connection computer A, the anode of resistance R1 and diode D1, the negative electrode connection resistance R2 of diode D1, resistance R4, The base stage of the other end connecting triode V1 of electric capacity C3 and relay K, resistance R1, the emitter stage connection resistance R2's of triode V1 The other end, the other end, resistance R5, loudspeaker B, the colelctor electrode and rectifier bridge of triode V2 of the other end connection electric capacity C3 of electric capacity C2 The port 4 of T, the base stage of the other end connecting triode V1 of resistance R1, the other end of the emitter stage connection resistance R2 of triode V1, The negative electrode and resistance R5 of the other end connection diode D2 of resistance R4, the base stage of the anode connecting triode V2 of diode D2, three The other end of the emitter stage connection relay K of pole pipe V2.

Triode V1 and triode V2 are PNP triode.The relay K is normally opened contact relay.Rectifier bridge T is The full-wave rectifying circuit being made up of 4 IN4007 type diodes.Resistance R3 and electric capacity C1 composition capacitance-resistance voltage reduction circuits

Operation principle of the present utility model is：Triode V2 in circuit is normally-closed contact relay, 220V line voltages By after the resistance-capacitance type step-down voltage step-down that resistance R3 and electric capacity C1 is constituted, carrying out rectification into rectifier bridge T, electric capacity C2 is filter Ripple electric capacity, the DC voltage exported from the port 2 of rectifier bridge T is powered by the contact K-1 of relay K to computer A, and now three The base stage of pole pipe V1 is obtained electric and ended, while voltage also charges by diode D1 to electric capacity C3, and voltage is by resistance R4 With the base stage that triode V2 is added in after diode D2 so that PNP triode V2 is not turned on, the contact K-1 of relay K is in normally closed State, run into civil power less than under-voltage critical value when, its by be insufficient to allow after resistance R4 and resistance R5 partial pressures diode D2 turn on, Triode V2 therefore and turn on, relay K obtains electric, its contact K-1 disconnection, electric capacity C3 to circuit discharging, due to triode V1's Base stage dead electricity, therefore V1 conductings, loudspeaker B work, while maintaining the conducting of relay K, after a period of time, electric capacity C3 electric discharges are tied Beam, circuit recovers to start, if continuing undervoltage condition occur, repeats above-mentioned action.

It is obvious to a person skilled in the art that the utility model is not limited to the details of above-mentioned one exemplary embodiment, and And in the case of without departing substantially from spirit or essential attributes of the present utility model, can in other specific forms realize that this practicality is new Type.Therefore, no matter from the point of view of which point, embodiment all should be regarded as exemplary, and is nonrestrictive, this practicality is new The scope of type limits by appended claims rather than described above, it is intended that the equivalency fallen in claim is contained All changes in justice and scope are included in the utility model.Any reference in claim should not be considered as limitation Involved claim.

Moreover, it will be appreciated that although the present specification is described in terms of embodiments, not each implementation method is only wrapped Containing an independent technical scheme, this narrating mode of specification is only that for clarity, those skilled in the art should Specification an as entirety, the technical scheme in each embodiment can also be formed into those skilled in the art through appropriately combined May be appreciated other embodiment.

Claims (5)

1. a kind of voltage alarm circuit for computer, including diode D1, triode V2, electric capacity C1 and resistance R3, it is special Levy and be, one end connection electric capacity C1 and 220V alternating current of the resistance R3, the other end connection electric capacity C1's of resistance R3 is another End and the port 1 of rectifier bridge T, the port 2 of rectifier bridge T connect the contact K-1, the contact K- of relay K of electric capacity C2 and relay K 1 other end connection computer A, the anode of resistance R1 and diode D1, the negative electrode connection resistance R2 of diode D1, resistance R4, The base stage of the other end connecting triode V1 of electric capacity C3 and relay K, resistance R1, the emitter stage connection resistance R2's of triode V1 The other end, the other end, resistance R5, loudspeaker B, the colelctor electrode and rectifier bridge of triode V2 of the other end connection electric capacity C3 of electric capacity C2 The port 4 of T, the base stage of the other end connecting triode V1 of resistance R1, the other end of the emitter stage connection resistance R2 of triode V1, The negative electrode and resistance R5 of the other end connection diode D2 of resistance R4, the base stage of the anode connecting triode V2 of diode D2, three The other end of the emitter stage connection relay K of pole pipe V2.

2. a kind of voltage alarm circuit for computer according to claim 1, it is characterised in that the triode V1 PNP triode is with triode V2.

3. a kind of voltage alarm circuit for computer according to claim 1, it is characterised in that the relay K It is normally opened contact relay.

4. a kind of voltage alarm circuit for computer according to claim 1, it is characterised in that the rectifier bridge T It is the full-wave rectifying circuit being made up of 4 IN4007 type diodes.

5. a kind of voltage alarm circuit for computer according to claim 1, it is characterised in that the resistance R3 and Electric capacity C1 constitutes capacitance-resistance voltage reduction circuit.