CN205540558U - DC power supply on -off controller - Google Patents

Abstract

The utility model discloses a DC power supply on -off controller, including resistance R1, electric capacity C1, key switch SB, triode VT1, MOS pipe VT3 and emitting diode LED, the resistance R1 one end VCC that connects respectively, resistance R5 and MOS pipe VT3's the S utmost point, triode VT1 collecting electrode is connected respectively to the resistance R1 other end, resistance R3 and resistance R4, key switch SB and electric capacity C1 are connected respectively to the resistance R4 other end, triode VT1 base and resistance R2 are connected respectively to the key switch SB other end, the resistance R2 other end is the connecting resistance R5 other end respectively, triode VT2 collecting electrode, MOS pipe VT3's the G utmost point and electric capacity C3, MOS pipe VT3's the D utmost point is connected respectively to the electric capacity C3 other end, output vo and resistance R6. The utility model discloses DC power supply on -off controller adopts the break -make of key switch cooperation triode and MOS control oil pipe power, and circuit structure is very simple, can effectively control switch, realizes the standby zero -power.

Description

A kind of DC power supply switch controller

Technical field

This utility model relates to a kind of controller, specifically a kind of DC power supply switch controller.

Background technology

Switching Power Supply is to utilize modern power electronics technology, control the time ratio that switching tube turns on and off, maintain a kind of power supply of regulated output voltage, Switching Power Supply is typically made up of pulse width modulation control single chip computer and MOSFET, development and innovation along with Power Electronic Technique so that switch power technology is also innovated constantly.At present, Switching Power Supply is widely used almost all of electronic equipment with small-sized, light weight and high efficiency feature, it is that current electronics and information industry develops rapidly indispensable a kind of power mode, and single-chip microcomputer is as the miniature control of modern society requisite control element, its power switch controls the emphasis of the interior research of always industry, in existing a lot of Single Chip Microcomputer (SCM) system on-off circuit, it is impossible to accomplish to complete switch off power supply, it is achieved Zero-power-consumption standby.

Utility model content

The purpose of this utility model is to provide a kind of DC power supply switch controller, 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 DC power supply switch controller，Including resistance R1、Electric capacity C1、Key switch SB、Audion VT1、Metal-oxide-semiconductor VT3 and LED，Described resistance R1 one end connects power supply VCC respectively、The S pole of resistance R5 and metal-oxide-semiconductor VT3，Resistance R1 other end connecting triode VT1 colelctor electrode respectively、Resistance R3 and resistance R4，The resistance R4 other end connects key switch SB and electric capacity C1 respectively，The key switch SB other end connecting triode VT1 base stage and resistance R2 respectively，The resistance R2 other end connects the resistance R5 other end respectively、Audion VT2 colelctor electrode、The G pole of metal-oxide-semiconductor VT3 and electric capacity C3，The electric capacity C3 other end connects the D pole of metal-oxide-semiconductor VT3 respectively、Output end vo and resistance R6，Resistance R6 other end connecting luminous diode LED positive pole，LED negative pole connects resistance R7 respectively、Electric capacity C2、The electric capacity C1 other end and audion VT1 emitter stage，The resistance R7 other end connects the electric capacity C2 other end and audion VT2 emitter stage respectively.

As this utility model further scheme: described power supply VCC voltage is 5V.

Compared with prior art, the beneficial effects of the utility model are: this utility model DC power supply switch controller uses key switch to coordinate audion and metal-oxide-semiconductor to control the break-make of power supply, circuit structure is very simple, effectively can be controlled on and off switch, it is achieved standby zero-power-consumption.

Accompanying drawing explanation

Fig. 1 is the circuit diagram of DC power supply switch controller.

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 DC power supply switch controller，Including resistance R1、Electric capacity C1、Key switch SB、Audion VT1、Metal-oxide-semiconductor VT3 and LED，Described resistance R1 one end connects power supply VCC respectively、The S pole of resistance R5 and metal-oxide-semiconductor VT3，Resistance R1 other end connecting triode VT1 colelctor electrode respectively、Resistance R3 and resistance R4，The resistance R4 other end connects key switch SB and electric capacity C1 respectively，The key switch SB other end connecting triode VT1 base stage and resistance R2 respectively，The resistance R2 other end connects the resistance R5 other end respectively、Audion VT2 colelctor electrode、The G pole of metal-oxide-semiconductor VT3 and electric capacity C3，The electric capacity C3 other end connects the D pole of metal-oxide-semiconductor VT3 respectively、Output end vo and resistance R6，Resistance R6 other end connecting luminous diode LED positive pole，LED negative pole connects resistance R7 respectively、Electric capacity C2、The electric capacity C1 other end and audion VT1 emitter stage，The resistance R7 other end connects the electric capacity C2 other end and audion VT2 emitter stage respectively；Described power supply VCC voltage is 5V.

Operation principle of the present utility model is: refer to Fig. 1, VT1, VT2 form bistable circuit, due to the effect of C1, the when of powering on, VT1 first turns on, and VT2 ends, if not pressing SB, circuit will maintain this state, and VT3 is P-channel enhancement type metal-oxide-semiconductor, because VT2 cut-off, VT3 is also switched off, and system can not get power supply；Now about the current collection of VT1 extremely low level 0.3V, the voltage on C1 is also about 0.3V, and after pressing SB, VT1 base stage is moved to 0.3V by C1, ends rapidly.VT2 begins to turn on, and the state of circuit overturns, and the gate pole of VT3 is moved to after VT2 conducting electronegative potential, and VT3 turns on, and power supply passes through VT3 to system power supply；After VT2 conducting, C1 is charged by R1, R4, and voltage rises to about 1V, and the voltage the most again pressing SB, C1 is added to VT1 base stage, and VT1 turns on, and VT1 current collection extremely low level forces VT2 to end by R3, and VT3 is also switched off, system closedown.

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. a DC power supply switch controller，Including resistance R1、Electric capacity C1、Key switch SB、Audion VT1、Metal-oxide-semiconductor VT3 and LED，It is characterized in that，Described resistance R1 one end connects power supply VCC respectively、The S pole of resistance R5 and metal-oxide-semiconductor VT3，Resistance R1 other end connecting triode VT1 colelctor electrode respectively、Resistance R3 and resistance R4，The resistance R4 other end connects key switch SB and electric capacity C1 respectively，The key switch SB other end connecting triode VT1 base stage and resistance R2 respectively，The resistance R2 other end connects the resistance R5 other end respectively、Audion VT2 colelctor electrode、The G pole of metal-oxide-semiconductor VT3 and electric capacity C3，The electric capacity C3 other end connects the D pole of metal-oxide-semiconductor VT3 respectively、Output end vo and resistance R6，Resistance R6 other end connecting luminous diode LED positive pole，LED negative pole connects resistance R7 respectively、Electric capacity C2、The electric capacity C1 other end and audion VT1 emitter stage，The resistance R7 other end connects the electric capacity C2 other end and audion VT2 emitter stage respectively.
2. DC power supply switch controller the most according to claim 1, it is characterised in that described power supply VCC voltage is 5V.