CN205608073U - A over - voltage detection circuit for singlechip - Google Patents

Abstract

The utility model discloses an over - voltage detection circuit for singlechip, including diode D1, resistance R1, electric capacity C1, triode VT1, triode VT2 and diode D2, the diode D1 negative pole VCC that connects, the anodal connecting resistance R1 of diode D1, the resistance R1 other end is connecting resistance R3 and resistance R2 respectively, electric capacity C1 is connected respectively to the resistance R2 other end, resistance R4, resistance R6 and electric capacity C3 and ground connection, the electric capacity C3 other end is the connecting resistance R6 other end and triode VT2 projecting pole respectively, triode VT2 base is the connecting resistance R3 other end respectively, the electric capacity C1 other end, the resistance R4 other end and triode VT1 collecting electrode. The utility model discloses an over - voltage detection circuit for singlechip can send excessive pressure signal conversion to singlechip AD port for the low level to make the singlechip make corresponding control, circuit structure is simple, and is with low costs, small, and application scope is wide.

Description

A kind of over-voltage detection circuit for single-chip microcomputer

Technical field

This utility model relates to a kind of voltage detecting circuit, a kind of over-voltage detection circuit for single-chip microcomputer.

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, and the variation of consumer electronics, also result in the instability of line voltage, voltage fluctuated, also become to damage the principal element of electric equipment, how accurately to have detected when change in voltage is bigger and to be controlled, always the emphasis of research in industry.

Utility model content

The purpose of this utility model is to provide a kind of over-voltage detection circuit for single-chip microcomputer, 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 over-voltage detection circuit for single-chip microcomputer，Including diode D1、Resistance R1、Electric capacity C1、Audion VT1、Audion VT2 and diode D2，Described diode D1 negative pole connects power supply VCC，Diode D1 positive pole connects resistance R1，The resistance R1 other end connects resistance R3 and resistance R2 respectively，The resistance R2 other end connects electric capacity C1 respectively、Resistance R4、Resistance R6 and electric capacity C3 ground connection，The electric capacity C3 other end connects the resistance R6 other end and audion VT2 emitter stage respectively，Audion VT2 base stage connects the resistance R3 other end respectively、The electric capacity C1 other end、The resistance R4 other end and audion VT1 colelctor electrode，Audion VT1 base stage connects diode D2 positive pole respectively、Electric capacity C2 and resistance R5，Resistance R5 other end connecting triode VT1 emitter stage respectively、Diode D2 negative pole、The electric capacity C2 other end and output end vo.

As further program of the utility model: described power supply VCC is power supply to be detected.

As this utility model further scheme: described output end vo connects Chip Microcomputer A/D port.

Compared with prior art, the beneficial effects of the utility model are: overvoltage signal, for the over-voltage detection circuit of single-chip microcomputer, can be converted to low level and deliver to Chip Microcomputer A/D port by this utility model, so that corresponding control made by single-chip microcomputer, circuit structure is simple, low cost, volume is little, applied widely.

Accompanying drawing explanation

Fig. 1 is the circuit diagram of the over-voltage detection circuit for single-chip microcomputer.

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 over-voltage detection circuit for single-chip microcomputer，Including diode D1、Resistance R1、Electric capacity C1、Audion VT1、Audion VT2 and diode D2，Described diode D1 negative pole connects power supply VCC，Diode D1 positive pole connects resistance R1，The resistance R1 other end connects resistance R3 and resistance R2 respectively，The resistance R2 other end connects electric capacity C1 respectively、Resistance R4、Resistance R6 and electric capacity C3 ground connection，The electric capacity C3 other end connects the resistance R6 other end and audion VT2 emitter stage respectively，Audion VT2 base stage connects the resistance R3 other end respectively、The electric capacity C1 other end、The resistance R4 other end and audion VT1 colelctor electrode，Audion VT1 base stage connects diode D2 positive pole respectively、Electric capacity C2 and resistance R5，Resistance R5 other end connecting triode VT1 emitter stage respectively、Diode D2 negative pole、The electric capacity C2 other end and output end vo；Described power supply VCC is power supply to be detected；Described output end vo connects Chip Microcomputer A/D port.

Operation principle of the present utility model is: refer to Fig. 1, and when power supply VCC voltage is normal, Zener diode D1 ends, VT1 and VT2 is in cut-off state.When the VCC voltage voltage stabilizing value more than D1, D1 makes VT1 enter saturation after puncturing, then the b electrode potential of VT1 can be less than e electrode potential, VT2 is also into saturation conduction state, output end vo is low level, and send Chip Microcomputer A/D port by this signal, so that single-chip microcomputer sends command adapted thereto.

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 (3)

1. null1. the over-voltage detection circuit for single-chip microcomputer，Including diode D1、Resistance R1、Electric capacity C1、Audion VT1、Audion VT2 and diode D2，It is characterized in that，Described diode D1 negative pole connects power supply VCC，Diode D1 positive pole connects resistance R1，The resistance R1 other end connects resistance R3 and resistance R2 respectively，The resistance R2 other end connects electric capacity C1 respectively、Resistance R4、Resistance R6 and electric capacity C3 ground connection，The electric capacity C3 other end connects the resistance R6 other end and audion VT2 emitter stage respectively，Audion VT2 base stage connects the resistance R3 other end respectively、The electric capacity C1 other end、The resistance R4 other end and audion VT1 colelctor electrode，Audion VT1 base stage connects diode D2 positive pole respectively、Electric capacity C2 and resistance R5，Resistance R5 other end connecting triode VT1 emitter stage respectively、Diode D2 negative pole、The electric capacity C2 other end and output end vo.
2. Over-voltage detection circuit for single-chip microcomputer the most according to claim 1, it is characterised in that described power supply VCC is power supply to be detected.
3. Over-voltage detection circuit for single-chip microcomputer the most according to claim 1, it is characterised in that described output end vo connects Chip Microcomputer A/D port.