CN205319943U

CN205319943U - Adjustable voltage stabilizer with short -circuit protection function

Info

Publication number: CN205319943U
Application number: CN201620079469.3U
Authority: CN
Inventors: 王耿; 李泽平; 程伟
Original assignee: Hubei University of Science and Technology
Current assignee: Hubei University of Science and Technology
Priority date: 2016-01-27
Filing date: 2016-01-27
Publication date: 2016-06-15
Anticipated expiration: 2026-01-27

Abstract

The utility model discloses an adjustable voltage stabilizer with short -circuit protection function, including resistance R1, resistance R2, triode V1 and the adjustable reference source D1 of three -terminal, triode V2's collecting electrode is connected to the specified one end connecting resistance R2 of resistance R1, resistance R3, resistance R4, electric capacity C1, power E's positive pole and triode V1's projecting pole, resistance R1's the other end, and the adjustable reference source D1's of three -terminal the reference utmost point is connected to resistance R2's the other end, and triode V2's base is connected to the adjustable reference source D1's of three -terminal negative pole. The utility model discloses adjustable voltage stabilizer with short -circuit protection function simple structure, components and parts are few, and not only output voltage is adjustable, utilize essential electronic component to constitute short -circuit protection circuit moreover, and short -circuit fault can also auto -response after getting rid of, have consequently that the function is various, convenient to use and a strong advantage of practicality.

Description

A kind of adjustable voltage stabilizer with short-circuit protection function

Technical field

This utility model relates to a kind of manostat, specifically a kind of adjustable voltage stabilizer with short-circuit protection function.

Background technology

Along with improving constantly of people's living standard, electronic equipment has become as a requisite part in life, especially various household electrical appliance bring great convenience to the life of people, work, and this kind of electronic installation is desirable that a manostat that precision is higher, electric current is bigger. The constant voltage dc source of existing market is of a great variety; its mid and low-end products are especially many; although the relative high-end product of low-end product has the advantage of price; but quality is often as one wishes not to the utmost; once load generation open circuit may burn electrical equipment; minority there is also, with the manostat of open circuit protection, the operation needing manual reset, uses very inconvenient, therefore needs to be improved.

Utility model content

The purpose of this utility model is in that to provide the adjustable voltage stabilizer with short-circuit protection function of a kind of simple in construction, stable performance, with the problem solving to propose in above-mentioned background technology.

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

A kind of adjustable voltage stabilizer with short-circuit protection function, including resistance R1, resistance R2, audion V1 and three end adjustable reference source D1, the specified one end of described resistance R1 connects resistance R2, resistance R3, resistance R4, electric capacity C1, the positive pole of power supply E and the emitter stage of audion V1, the colelctor electrode of the other end connecting triode V2 of resistance R1, the other end of resistance R2 connects the reference pole of three end adjustable reference source D1, the base stage of the negative electrode connecting triode V2 of three end adjustable reference source D1, the plus earth of three end adjustable reference source D1, the emitter stage of audion V2 connects the negative electrode of diode D2, load A, the colelctor electrode of audion V3 and one of potentiometer RP2 fixing end, the emitter stage of the other end connecting triode V3 of resistance R3, the base stage of another fixing end connecting triode V3 of potentiometer RP1 and the emitter stage of audion V4, the base stage of the sliding end connecting triode V1 of potentiometer RP1, the base stage of the other end connecting triode V4 of resistance R4 and the colelctor electrode of audion V5, the colelctor electrode of audion V1 connects resistance R6, the anode of diode D2 and the emitter stage of audion V5, the colelctor electrode of audion V4 connects resistance R5, the other end of electric capacity C1 connects the other end of resistance R5, the other end of resistance R6, another fixing end of potentiometer RP2, the other end of load A and the negative pole of power supply E, the base stage of audion V5 connects the sliding end of potentiometer RP2.

As preferred version of the present utility model: the model of described three end adjustable reference source D1 is TL431.

Compared with prior art; the beneficial effects of the utility model are: it is few that this utility model has the adjustable voltage stabilizer simple in construction of short-circuit protection function, components and parts; not only output voltage is adjustable; and utilize basic electronic component composition short-circuit protection circuit; and can also automatically reply after short trouble eliminating, therefore there is diverse in function, easy to use and practical advantage.

Accompanying drawing explanation

Fig. 1 is the circuit diagram of the adjustable voltage stabilizer with short-circuit protection function.

Detailed description of the invention

Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is clearly and completely described, it is clear that described embodiment is only a part of embodiment of this utility model, rather than whole embodiments. Based on the embodiment in this utility model, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of this utility model protection.

Refer to Fig. 1, in this utility model embodiment, a kind of adjustable voltage stabilizer with short-circuit protection function, including resistance R1, resistance R2, audion V1 and three end adjustable reference source D1, the specified one end of described resistance R1 connects resistance R2, resistance R3, resistance R4, electric capacity C1, the positive pole of power supply E and the emitter stage of audion V1, the colelctor electrode of the other end connecting triode V2 of resistance R1, the other end of resistance R2 connects the reference pole of three end adjustable reference source D1, the base stage of the negative electrode connecting triode V2 of three end adjustable reference source D1, the plus earth of three end adjustable reference source D1, the emitter stage of audion V2 connects the negative electrode of diode D2, load A, the colelctor electrode of audion V3 and one of potentiometer RP2 fixing end, the emitter stage of the other end connecting triode V3 of resistance R3, the base stage of another fixing end connecting triode V3 of potentiometer RP1 and the emitter stage of audion V4, the base stage of the sliding end connecting triode V1 of potentiometer RP1, the base stage of the other end connecting triode V4 of resistance R4 and the colelctor electrode of audion V5, the colelctor electrode of audion V1 connects resistance R6, the anode of diode D2 and the emitter stage of audion V5, the colelctor electrode of audion V4 connects resistance R5, the other end of electric capacity C1 connects the other end of resistance R5, the other end of resistance R6, another fixing end of potentiometer RP2, the other end of load A and the negative pole of power supply E, the base stage of audion V5 connects the sliding end of potentiometer RP2.

The model of three end adjustable reference source D1 is TL431.

Operation principle of the present utility model is: in this manostat, short circuit current is determined by adjunct circuit. The interlock circuit protective current being made up of audion V1 is from overload, and the interlock circuit being made up of audion V2 determines the size of short circuit current, when output voltage increases; audion V5 base bias reduces; its collector current reduces, and voltage raises, thus causing audion V4 base voltage to raise; electric current reduces; its emitter voltage raises, and electric current reduces, and V3 tube voltage drop increases; thus make output voltage reduce, reach the purpose of voltage stabilizing. Output voltage can be changed by regulator potentiometer RP2. When the load, pressure drop on resistance R3 increases, and makes audion V3 base bias reduce, thus causing protection pipe V1 slightly to turn on, audion V5 ends, and circuit transition is to the duty limiting load current.Regulator potentiometer RP1, it may be determined that current limliting threshold value. Having served as load when strengthening further, load is cut off. Automatic restoring circuit is determined by audion V2. In the short-circuit state, this pipe saturation conduction, limited by resistance R1 by its electric current. When, after load short circuits Failure elimination, occurring making the audion V5 voltage slightly turned on, cause the startup of manostat. Audion V2 base voltage is in advance by the given level less than 5v of Zener diode D1, and so when circuit enters duty, V2 ends, and load current is only by audion V3.

Claims

1. an adjustable voltage stabilizer with short-circuit protection function, including resistance R1, resistance R2, audion V1 and three end adjustable reference source D1, it is characterized in that, the specified one end of described resistance R1 connects resistance R2, resistance R3, resistance R4, electric capacity C1, the positive pole of power supply E and the emitter stage of audion V1, the colelctor electrode of the other end connecting triode V2 of resistance R1, the other end of resistance R2 connects the reference pole of three end adjustable reference source D1, the base stage of the negative electrode connecting triode V2 of three end adjustable reference source D1, the plus earth of three end adjustable reference source D1, the emitter stage of audion V2 connects the negative electrode of diode D2, load A, the colelctor electrode of audion V3 and one of potentiometer RP2 fixing end, the emitter stage of the other end connecting triode V3 of resistance R3, the base stage of another fixing end connecting triode V3 of potentiometer RP1 and the emitter stage of audion V4, the base stage of the sliding end connecting triode V1 of potentiometer RP1, the base stage of the other end connecting triode V4 of resistance R4 and the colelctor electrode of audion V5, the colelctor electrode of audion V1 connects resistance R6, the anode of diode D2 and the emitter stage of audion V5, the colelctor electrode of audion V4 connects resistance R5, the other end of electric capacity C1 connects the other end of resistance R5, the other end of resistance R6, another fixing end of potentiometer RP2, the other end of load A and the negative pole of power supply E, the base stage of audion V5 connects the sliding end of potentiometer RP2.

2. a kind of adjustable voltage stabilizer with short-circuit protection function according to claim 1, it is characterised in that the model of described three end adjustable reference source D1 is TL431.