CN204668911U

CN204668911U - A kind of voltage protection circuit

Info

Publication number: CN204668911U
Application number: CN201520360889.4U
Authority: CN
Inventors: 林志明
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-05-30
Filing date: 2015-05-30
Publication date: 2015-09-23
Anticipated expiration: 2025-05-30

Abstract

The utility model discloses a kind of voltage protection circuit, comprise overvoltage crowbar and power failure warning circuit, described overvoltage crowbar comprises resistance R1, electric capacity C1, relay J 1, rectifier bridge T and chip IC 1; Power failure warning circuit comprises relay J 2, battery E, chip IC 2 and loud speaker B.The utility model voltage protection circuit adopts accurate integrated regulator TL431, and voltage definite value is accurate, reliable operation; Adopt capacitor store electrical energy to promote relay, therefore quiescent dissipation is low, adopts and adds cut-offing alarming circuit simultaneously, runs into powering-off state and reminds people in time, therefore have structure simple, control advantage that is accurate, low in energy consumption and diverse in function.

Description

A kind of voltage protection circuit

Technical field

The utility model relates to a kind of protective circuit, specifically a kind of voltage protection circuit.

Background technology

In recent years, the electric utility of China was flourish, and most regional electricity consumption is all secure; but in remote mountain areas and west area; supply power voltage is still very unstable, and during peak, only 170V is upper and lower, again can more than 250V during the late into the night; in order to protect increasing household electrical appliance; configure an overvoltage protector or necessary, the most complex structure of voltage protector in the market, function singleness, and quiescent dissipation is higher; cause larger waste of energy, therefore popularity rate is not high.

Utility model content

The purpose of this utility model is to provide the voltage protection circuit that a kind of structure is simple, quiescent dissipation is low, to solve the problem proposed in above-mentioned background technology.

For achieving the above object, the utility model provides following technical scheme:

A kind of voltage protection circuit, comprise overvoltage crowbar and power failure warning circuit, described overvoltage crowbar comprises resistance R1, electric capacity C1, relay J 1, rectifier bridge T and chip IC 1; Power failure warning circuit comprises relay J 2, battery E, chip IC 2 and loud speaker B;

One end of resistance R1 connects electric capacity C1, the contact J-1 of relay J 1 and 220V line voltage, the other end of resistance R1 connects the other end of electric capacity C1 and the port one of rectifier bridge T, the other end of the contact J-1 of relay J 1 connects load RL, the other end of load RL connects the port 3 of rectifier bridge T and the other end of 220V line voltage, the port 2 contact resistance R2 of rectifier bridge T, resistance R3 and electric capacity C2, the port 4 of rectifier bridge T connects the other end of electric capacity C2, electric capacity C3, resistance R4, the pin 3 of resistance R5 and chip IC 1, the other end of other end contact resistance R4 of resistance R2 and the pin 2 of chip IC 1, the other end of resistance R3 connects the negative electrode of diode D1, the anode of diode D2, the other end of electric capacity C3 and relay J 1, the anode of diode D1 connects the other end of relay J 1 and the pin 1 of chip IC 1, the other end of the negative electrode contact resistance R5 of diode D2,

The contact J2-1 contact resistance R6 of relay J 2, the pin 4 of chip IC 2 and the pin 8 of chip IC 2, the other end contact resistance R7 of resistance R6 and the pin 7 of chip IC 2, the other end of resistance R4 connects electric capacity C5, the pin 2 of chip IC 2 and the pin 6 of chip IC 2, the other end of the contact J2-1 of relay J 2 connects the positive pole of power supply E, the negative pole of power supply E connects electric capacity C4, electric capacity C5, the pin 1 of loud speaker B and chip IC 2, the pin 5 of chip IC 2 connects the other end of electric capacity C5, the pin 3 of chip IC 2 connects the other end of loud speaker B, the model of described chip IC 1 is TL431, the model of described chip IC 2 is NE555.

As further program of the utility model: described relay J 1 and relay J 2 are normally-closed contact relay.

Compared with prior art, the beneficial effects of the utility model are: the utility model voltage protection circuit adopts accurate integrated regulator TL431, and voltage definite value is accurate, reliable operation; Adopt capacitor store electrical energy to promote relay, therefore quiescent dissipation is low, adopts and adds cut-offing alarming circuit simultaneously, runs into powering-off state and reminds people in time, therefore have structure simple, control advantage that is accurate, low in energy consumption and diverse in function.

Accompanying drawing explanation

Fig. 1 is the circuit diagram of voltage protection circuit;

Fig. 2 is the circuit diagram of power failure warning circuit.

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.

Refer to Fig. 1, in the utility model embodiment, a kind of voltage protection circuit, comprises overvoltage crowbar and power failure warning circuit, and described overvoltage crowbar comprises resistance R1, electric capacity C1, relay J 1, rectifier bridge T and chip IC 1; Power failure warning circuit comprises relay J 2, battery E, chip IC 2 and loud speaker B;

Relay J 1 and relay J 2 are normally-closed contact relay.

Operation principle of the present utility model is: when supply power voltage is normal, and TL431 controls pole 2 pin voltage and is less than 2.5V, the not conducting of TL431 circuit, and relay J 1 does not work, and its contact J-1 conducting state, load RL normally works.When line voltage reaches 250V, rectifying and wave-filtering after-current reaches 3.3mA, and on R3 and voltage-stabiliser tube D1, voltage drop is respectively 11V and 26V.The A point voltage of voltage after R2, R3 dividing potential drop in circuit is 2.55V, TL431 circuit turn-on, and relay J 1 is energized, and its tactile J-1 disconnects, and play the effect of protection household electrical appliance, the multivibrator that power-off informer forms primarily of IC2 and R5, R6, C4 etc. controls.When mains failure, relay J 2 disconnects, its normally-closed contact J2-1 adhesive, IC2 because of electric and starting of oscillation, frequency of oscillation is about 1000Hz, and output signal drives loud speaker sounding, and the power supply failed to inform owner, circuit adopts accurate integrated regulator TL431, and voltage definite value is accurate, reliable operation; Adopt capacitor store electrical energy to promote relay, therefore quiescent dissipation is low, adopts and adds cut-offing alarming circuit simultaneously, runs into powering-off state and reminds people in time, therefore have structure simple, control advantage that is accurate, low in energy consumption and diverse in function.

Claims

1. a voltage protection circuit, comprises overvoltage crowbar and power failure warning circuit; It is characterized in that, described overvoltage crowbar comprises resistance R1, electric capacity C1, relay J 1, rectifier bridge T and chip IC 1; Power failure warning circuit comprises relay J 2, battery E, chip IC 2 and loud speaker B;

2. a kind of voltage protection circuit according to claim 1, is characterized in that, described relay J 1 and relay J 2 are normally-closed contact relay.