CN205921362U - Take instruction function's overvoltage crowbar - Google Patents

Abstract

The utility model discloses a take instruction function's overvoltage crowbar, including NAND gate F1, NAND gate F2, resistance R1, potentiometre RP1, relay J and triode VT1, the relay J that contacts 1 do you connect input vi, the relay J that contacts 1 the potentiometre RP1 one end summation potential ware RP2 other end is connected respectively to the other end, and the potentiometre RP2 other end and ground connection are connected to the potentiometre RP1 other end, and input of NAND gate F2 is connected to potentiometre RP1 gleitbretter, and input of NAND gate F1 is connected to potentiometre RP2 gleitbretter. The utility model discloses take instruction function's overvoltage crowbar adopts the control of gate circuit cooperation triode, not only in under -voltage excessive pressure LED instruction occasionally, can also turn -off the power automatically under the excessive pressure condition, and the security is high, and circuit structure is simple, and is with low costs, small, need not the programming.

Description

A kind of overvoltage crowbar with instruction function

Technical field

This utility model is related to a kind of protection circuit, specifically a kind of overvoltage crowbar with instruction function.

Background technology

With the popularization of present electrical equipment, bring revolutionary change to industrial and agricultural production, Defence business, science and technology, Accelerate the development of society, people have stepped into Electrification Age, so that the quality of life of people is greatly improved, Increasingly it be unable to do without these electric equipments.With scientific and technological development, the precision of electric equipment also gradually steps up, and there occurs overturns the heavens covers The change on ground, but how to protect the not interfered by outside of these electric equipments, become the master of current development in science and technology concern Want problem.The electrical network of China is popularized at present, and it is many convenient that huge network system gives us.But it is as accessing electrical network User increase, and the variation of consumer electronics, also result in the unstable of line voltage, voltage fluctuated, also become Damage the principal element of electric equipment.How to protect electrical equipment when change in voltage is larger, become people's research now One direction.The multiplex Single-chip Controlling of prior art, not only control algolithm is complicated, and price is high.

Content of the invention

The purpose of this utility model is to provide a kind of overvoltage crowbar with instruction function, to solve above-mentioned background skill The problem proposing in art.

For achieving the above object, the following technical scheme of this utility model offer:

A kind of with instruction function overvoltage crowbar, including NAND gate f1, NAND gate f2, resistance r1, potentiometer rp1, Relay j and audion vt1, described relay j contact j-1 connects input vi, and the relay j contact j-1 other end connects respectively Connect potentiometer rp1 one end and the potentiometer rp2 other end, the potentiometer rp1 other end connects the potentiometer rp2 other end and is grounded, electricity Position device rp1 slide plate connects mono- input of NAND gate f2, and potentiometer rp2 slide plate connects mono- input of NAND gate f1, NAND gate Another input of f1 connects resistance r1 and electric capacity c1 respectively, NAND gate f1 outfan connect respectively the resistance r1 other end and with non- Door another input of f2, NAND gate f2 outfan connects the electric capacity c1 other end, resistance r2, relay j contact j-2 and three respectively Pole pipe vt2 base stage, audion vt2 emitter stage connects grounding relay j coil, and audion vt2 colelctor electrode connects resistance r4, resistance The r4 other end connects power supply vcc, the relay j contact j-2 other end and triode vt1 emitter stage respectively.

As further program of the utility model: described relay j contact j-1 is normally-closed contact.

As this utility model further scheme: described relay j contact j-2 is normally opened contact.

Compared with prior art, the beneficial effects of the utility model are: the overvoltage protection of this utility model band instruction function Circuit adopts gate circuit cooperation audion to control, and not only has led to indicate in under-voltage overvoltage, can also automatically close under overpressure situation Power-off source, safe, circuit structure is simple, low cost, and small volume need not program.

Brief description

Fig. 1 is the circuit diagram of the overvoltage crowbar with instruction function.

Specific embodiment

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

Refer to Fig. 1, in this utility model embodiment, a kind of overvoltage crowbar with instruction function, including NAND gate F1, NAND gate f2, resistance r1, potentiometer rp1, relay j and audion vt1, described relay j contact j-1 connects input Vi, the relay j contact j-1 other end connects potentiometer rp1 one end and the potentiometer rp2 other end, the potentiometer rp1 other end respectively Connect the potentiometer rp2 other end and be grounded, potentiometer rp1 slide plate connects mono- input of NAND gate f2, potentiometer rp2 slide plate is even Connect mono- input of NAND gate f1, another input of NAND gate f1 connects resistance r1 and electric capacity c1 respectively, NAND gate f1 exports End connects the resistance r1 other end and another input of NAND gate f2 respectively, and it is another that NAND gate f2 outfan connects electric capacity c1 respectively End, resistance r2, relay j contact j-2 and audion vt2 base stage, audion vt2 emitter stage connection grounding relay j coil, three Pole pipe vt2 colelctor electrode connects resistance r4, and the resistance r4 other end connects power supply vcc, the relay j contact j-2 other end and three respectively Level pipe vt1 emitter stage；Described relay j contact j-1 is normally-closed contact；Described relay j contact j-2 is normally opened contact.

Refer to Fig. 1, by pre-adjusting rp1, rp22, when monitored input vi voltage is normal value, make rp2 The voltage of sampling is slightly above the threshold level of f1, and the voltage of rp1 sampling is slightly below the threshold level of f2, and now, f1 value goes out 0, f2 Output 1, vt1 and vt2 is turned off, and led does not work, and when input vi voltage is higher than normal value, the voltage of rp1 and rp2 sampling is equal More than the threshold level of f1, f2, export all 0, vt1 saturation conductions, vt2 is also to maintain cut-off state, led Chang Liang；When defeated When entering to hold vi voltage to be less than normal value, the voltage of rp1 and rp2 sampling is below the threshold level of f1, f2, and f1, f2 are equivalent to instead Phase device, constitutes low-frequency oscillation with rc, and oscillator signal drives led flashing through vt1, and drives vt2 to open, relay j adhesive, The power supply of cut-out input vi, after turning off input vi, audion vt1 and vt2 base stage pass through power supply vcc triggering and conducting, make Input vi is held off.

In sum, this utility model band indicates that the overvoltage crowbar of function adopts gate circuit cooperation audion to control, Not only have led to indicate in under-voltage overvoltage, under overpressure situation can also automatically cutting off power source, safe, circuit structure is simple, Low cost, small volume, need not program.

It is obvious to a person skilled in the art that this 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, this practicality can be realized in other specific forms new Type.Therefore, no matter from the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, this practicality is new The scope of type is limited by claims rather than described above, it is intended that the containing of equivalency that will fall in claim All changes in justice and scope are included in this utility model.Any reference in claim should not be considered as limiting Involved claim.

Moreover, it will be appreciated that although this specification is been described by according to embodiment, not each embodiment only wraps Containing an independent technical scheme, only for clarity, those skilled in the art should for this narrating mode of description Using description as an entirety, the technical scheme in each embodiment can also form those skilled in the art through appropriately combined Understandable other embodiment.

Claims (3)

1. a kind of overvoltage crowbar with instruction function, including NAND gate f1, NAND gate f2, resistance r1, potentiometer rp1, continues , it is characterised in that described relay j contact j-1 connects input vi, relay j contact j-1 is another for electrical equipment j and audion vt1 End connects potentiometer rp1 one end and the potentiometer rp2 other end respectively, and the potentiometer rp1 other end connects the potentiometer rp2 other end simultaneously Ground connection, potentiometer rp1 slide plate connects mono- input of NAND gate f2, and potentiometer rp2 slide plate connects mono- input of NAND gate f1, Another input of NAND gate f1 connects resistance r1 and electric capacity c1 respectively, and NAND gate f1 outfan connects the resistance r1 other end respectively With another input of NAND gate f2, NAND gate f2 outfan connects the electric capacity c1 other end, resistance r2, relay j contact respectively J-2 and audion vt2 base stage, audion vt2 emitter stage connects grounding relay j coil, and audion vt2 colelctor electrode connects resistance R4, the resistance r4 other end connects power supply vcc, the relay j contact j-2 other end and triode vt1 emitter stage respectively.

2. the overvoltage crowbar with instruction function according to claim 1 is it is characterised in that described relay j contact J-1 is normally-closed contact.

3. the overvoltage crowbar with instruction function according to claim 1 is it is characterised in that described relay j contact J-2 is normally opened contact.