CN205540376U - Electric power precision component wire voltage limiting controller - Google Patents

Abstract

The utility model discloses an electric power precision component wire voltage limiting controller, including resistance R1, resistance R2, electric capacity C1, electric capacity C2, triode VT1, controllable accurate steady voltage source VS and triode VT2, triode VT1 projecting pole is connected respectively to resistance R1 one end, resistance R5, resistance R9 and power VCC, the resistance R1 other end is connecting resistance R2 respectively, controllable accurate steady voltage source VS's the K utmost point and load component RL, the resistance R2 other end is connecting resistance R3 and triode VT1 base respectively, triode VT1 collecting electrode is connecting resistance R4 respectively, electric capacity C2 and resistance R8, the resistance R4 other end is the connecting resistance R5 other end respectively, the load component RL other end, resistance R6 and controllable accurate steady voltage source VS's the R utmost point. The utility model discloses electric power precision component wire voltage limiting controller can continuously detect input voltage, effectively carries out the voltage limiting to the load component, and circuit structure is simple, and application scope is wide.

Description

A kind of electric power precision element limited-voltage control device

Technical field

This utility model relates to a kind of controller, specifically a kind of electric power precision element limited-voltage control device.

Background technology

Along with popularizing of present electrical equipment, bringing revolutionary change to industrial and agricultural production, Defence business, science and technology, accelerate the development of society, people have stepped into Electrification Age, also the quality of life making people is greatly improved, and the most increasingly be unable to do without these electric equipments.Along with the development of science and technology, the precision of electric equipment also gradually steps up, and there occurs earth-shaking change, but how to protect the most interfered by outside of these electric equipments, has become the subject matter that current development in science and technology is paid close attention to.The electrical network of China is popularized at present, and it is many convenient that huge network system gives us.But the user being as accessing electrical network increases, variation with consumer electronics, also result in the instability of line voltage, voltage fluctuated, also become to damage the principal element of electric equipment, the research of D.C. regulated power supply was never terminated by people, how to take into account stability and low cost, the direction that always people pursue, existing a lot of regulated power supply all use stabilivolt voltage is carried out stable, but the most still there will be the situation of superpressure, additionally also has the design using feedback regulation, these designs all can have transient voltage to exceed the situation of voltage limiting value, for a lot of accurate electronic components, it is sufficient for the most in a flash damaging.

Utility model content

The purpose of this utility model is to provide a kind of electric power precision element limited-voltage control device, with the problem solving to propose in above-mentioned background technology.

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

nullA kind of electric power precision element limited-voltage control device，Including resistance R1、Resistance R2、Electric capacity C1、Electric capacity C2、Audion VT1、Controllable accurate source of stable pressure VS and audion VT2，Described resistance R1 one end connecting triode VT1 emitter stage respectively、Resistance R5、Resistance R9 and power supply VCC，The resistance R1 other end connects resistance R2 respectively、The K pole of controllable accurate source of stable pressure VS and load elements RL，The resistance R2 other end connects resistance R3 and audion VT1 base stage respectively，Audion VT1 colelctor electrode connects resistance R4 respectively、Electric capacity C2 and resistance R8，The resistance R4 other end connects the resistance R5 other end respectively、The load elements RL other end、Resistance R6 and the R pole of controllable accurate source of stable pressure VS，Described resistance R8 other end connecting triode VT2 base stage，Audion VT2 emitter stage connects resistance R10 and electric capacity C1 respectively，The electric capacity C1 other end connects the resistance R10 other end respectively、The electric capacity C2 other end、The resistance R6 other end、The A pole of controllable accurate source of stable pressure VS and the resistance R3 other end.

As this utility model further scheme: described controllable accurate source of stable pressure VS uses TL431.

Compared with prior art, the beneficial effects of the utility model are: input terminal voltage can persistently be detected by this utility model electric power precision element limited-voltage control device, effectively load elements is carried out pressure limiting, and circuit structure is simple, applied widely.

Accompanying drawing explanation

Fig. 1 is the circuit diagram of electric power precision element limited-voltage control device.

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 are obtained under not making creative work premise, broadly fall into the scope of this utility model protection.

nullRefer to Fig. 1，In this utility model embodiment，A kind of electric power precision element limited-voltage control device，Including resistance R1、Resistance R2、Electric capacity C1、Electric capacity C2、Audion VT1、Controllable accurate source of stable pressure VS and audion VT2，Described resistance R1 one end connecting triode VT1 emitter stage respectively、Resistance R5、Resistance R9 and power supply VCC，The resistance R1 other end connects resistance R2 respectively、The K pole of controllable accurate source of stable pressure VS and load elements RL，The resistance R2 other end connects resistance R3 and audion VT1 base stage respectively，Audion VT1 colelctor electrode connects resistance R4 respectively、Electric capacity C2 and resistance R8，The resistance R4 other end connects the resistance R5 other end respectively、The load elements RL other end、Resistance R6 and the R pole of controllable accurate source of stable pressure VS，Described resistance R8 other end connecting triode VT2 base stage，Audion VT2 emitter stage connects resistance R10 and electric capacity C1 respectively，The electric capacity C1 other end connects the resistance R10 other end respectively、The electric capacity C2 other end、The resistance R6 other end、The A pole of controllable accurate source of stable pressure VS and the resistance R3 other end；Described controllable accurate source of stable pressure VS uses TL431.

Operation principle of the present utility model is: refer to Fig. 1, load elements RL voltage delivers to the R end of VS through R5, R6 dividing potential drop, this partial pressure value is when below 2.5V, the K end of VS is equivalent to open circuit (having the leakage current of about 400uA) and does not the most produce parasitic pressure drop on R1, so, not enough so that VT1 conducting by R1, R2, R3 dividing potential drop in VT1 base stage, therefore VT2 is not turned on, and circuit is in static (high resistant) state；When working as R5, R6 dividing point equal to 2.5V, the effect amplified due to VT1, make the K pole tension of VS decline (more than electric current 100mA can be drawn) and pressure reduction will be produced on R1, make VT1 conducting enter magnifying state, and drive VT2 conducting to enter magnifying state；I.e., owing to the R pole tension of U1 and the span of VT2 collector current are the biggest, when the resistance R9 that the potential-divider network connect and the VT2 colelctor electrode of the R end of VS are connect is connected in same point, the characteristic of circuit is similar to Zener diode characteristic, to a certain extent terminal voltage is limited in " voltage stabilizing value " below, it is ensured that load elements RL in use will not overvoltage.

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 in the case of without departing substantially from spirit or essential attributes of the present utility model, it is possible to realize this utility model in other specific forms.Therefore, no matter from the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, scope of the present utility model is limited by claims rather than described above, it is intended that all changes fallen in the implication of equivalency and scope of claim included in this utility model.Should not be considered as limiting involved claim by any reference in claim.

In addition, it is to be understood that, although this specification is been described by according to embodiment, but the most each embodiment only comprises an independent technical scheme, this narrating mode of description is only for clarity sake, description should can also be formed, through appropriately combined, other embodiments that it will be appreciated by those skilled in the art that as an entirety, the technical scheme in each embodiment by those skilled in the art.

Claims (2)

1. null1. an electric power precision element limited-voltage control device，Including resistance R1、Resistance R2、Electric capacity C1、Electric capacity C2、Audion VT1、Controllable accurate source of stable pressure VS and audion VT2，It is characterized in that，Described resistance R1 one end connecting triode VT1 emitter stage respectively、Resistance R5、Resistance R9 and power supply VCC，The resistance R1 other end connects resistance R2 respectively、The K pole of controllable accurate source of stable pressure VS and load elements RL，The resistance R2 other end connects resistance R3 and audion VT1 base stage respectively，Audion VT1 colelctor electrode connects resistance R4 respectively、Electric capacity C2 and resistance R8，The resistance R4 other end connects the resistance R5 other end respectively、The load elements RL other end、Resistance R6 and the R pole of controllable accurate source of stable pressure VS，Described resistance R8 other end connecting triode VT2 base stage，Audion VT2 emitter stage connects resistance R10 and electric capacity C1 respectively，The electric capacity C1 other end connects the resistance R10 other end respectively、The electric capacity C2 other end、The resistance R6 other end、The A pole of controllable accurate source of stable pressure VS and the resistance R3 other end.
2. Electric power precision element limited-voltage control device the most according to claim 1, it is characterised in that described controllable accurate source of stable pressure VS uses TL431.