CN205622940U - LED table lamp control circuit of tape light - Google Patents

Abstract

The utility model discloses a LED table lamp control circuit of tape light, including triode VT1, resistance R1, electric capacity C1, emitting diode D1 and LED lamp, triode VT1 projecting pole is connected respectively to resistance R1 one end, electric capacity C1 and power VCC, triode VT2 base and triode VT4 collecting electrode are connected respectively to the resistance R1 other end, triode VT1 base is connected to triode VT2 collecting electrode, triode VT2 projecting pole is connecting resistance R2 and resistance R3 respectively, electric capacity C2 and triode VT3 base are connected respectively to the resistance R3 other end, electric capacity C4 and resistance R7 are connected respectively to triode VT3 projecting pole, triode VT3 collecting electrode connecting resistance R4. The utility model discloses LED table lamp control circuit of tape light adopts a plurality of triodes to control to having set up the start and having postponed the function, the surge current who probably produces when effectively preventing to start shooting is to the negative effects of circuit production, and have excessive pressure undervoltage protection function, the security height.

Description

A kind of tape light LED Lamp control circuit

Technical field

This utility model relates to a kind of desk lamp, the LED desk lamp control circuit of a kind of tape light.

Background technology

In recent years, semiconductor light source just steps into lighting field with the role of novel solid light source.By solid luminescence physics principle, close to 100%, luminous efficiency can have that running voltage is low, power consumption is little, response time is short, luminous efficiency is high, shock resistance, length in service life, light colour purity, stable and reliable for performance and low cost and other advantages.Along with the continuous reduction of LED price, improving constantly of luminosity, semiconductor light source presents the prospect of being widely applied in lighting field.The C-V characteristic of LED is identical with the C-V characteristic of general-purpose diode, and the relatively minor swing of forward voltage may result in the drastically change of forward current.The size of LED forward current can change with variation of ambient temperature, and environment reaches uniform temperature, and LED allows forward current to drastically reduce；In the case, if still leading to super-high-current, easily causing LED aging, reduction of service life, therefore LED needs one to have the reliable drive circuit driving function in application process.

Utility model content

The purpose of this utility model is to provide the LED desk lamp control circuit of a kind of tape light, 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 LED desk lamp control circuit of tape light，Including audion VT1、Resistance R1、Electric capacity C1、Light emitting diode D1 and LED，Described resistance R1 one end connecting triode VT1 emitter stage respectively、Electric capacity C1 and power supply VCC，The resistance R1 other end connecting triode VT2 base stage and audion VT4 colelctor electrode respectively，Audion VT2 colelctor electrode connecting triode VT1 base stage，Audion VT2 emitter stage connects resistance R2 and resistance R3 respectively，The resistance R3 other end connects electric capacity C2 and audion VT3 base stage respectively，Audion VT3 emitter stage connects electric capacity C4 and resistance R7 respectively，Audion VT3 colelctor electrode connects resistance R4，The resistance R4 other end connecting triode VT4 base stage and resistance R5 respectively，The resistance R5 other end connecting luminous diode D1 negative pole and diode D2 positive pole respectively，Diode D2 negative pole connects resistance R6，Light emitting diode D1 positive pole connecting triode VT1 colelctor electrode respectively、Electric capacity C3 and LED，The electric capacity C3 other end connects the resistance R6 other end respectively、Audion VT4 emitter stage、The resistance R7 other end、The electric capacity C4 other end、The electric capacity C2 other end、The resistance R2 other end and the electric capacity C1 other end.

As this utility model further scheme: described power supply VCC voltage is the 9V unidirectional current obtained after 220V electric main is changed.

Compared with prior art; the beneficial effects of the utility model are: the LED desk lamp control circuit of this utility model tape light; multiple audion is used to be controlled; and it is provided with starting-up delay function; the negative effect that when effectively preventing from starting shooting, circuit is produced by issuable surge current; and with over-and under-voltage defencive function, safety is high.

Accompanying drawing explanation

Fig. 1 is the circuit diagram of the LED desk lamp control circuit of tape light.

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 LED desk lamp control circuit of tape light，Including audion VT1、Resistance R1、Electric capacity C1、Light emitting diode D1 and LED，Described resistance R1 one end connecting triode VT1 emitter stage respectively、Electric capacity C1 and power supply VCC，The resistance R1 other end connecting triode VT2 base stage and audion VT4 colelctor electrode respectively，Audion VT2 colelctor electrode connecting triode VT1 base stage，Audion VT2 emitter stage connects resistance R2 and resistance R3 respectively，The resistance R3 other end connects electric capacity C2 and audion VT3 base stage respectively，Audion VT3 emitter stage connects electric capacity C4 and resistance R7 respectively，Audion VT3 colelctor electrode connects resistance R4，The resistance R4 other end connecting triode VT4 base stage and resistance R5 respectively，The resistance R5 other end connecting luminous diode D1 negative pole and diode D2 positive pole respectively，Diode D2 negative pole connects resistance R6，Light emitting diode D1 positive pole connecting triode VT1 colelctor electrode respectively、Electric capacity C3 and LED，The electric capacity C3 other end connects the resistance R6 other end respectively、Audion VT4 emitter stage、The resistance R7 other end、The electric capacity C4 other end、The electric capacity C2 other end、The resistance R2 other end and the electric capacity C1 other end；Described power supply VCC voltage is the 9V unidirectional current obtained after 220V electric main is changed.

Operation principle of the present utility model is: referring to the series connection that Fig. 1, VT1 are colelctor electrode output and adjust pipe, VT2 is plus and blowup pipe, VT3 and VT4 is that differential type Wuchang amplifier, D1, D2 and resistance R6 constitute sample circuit.

The voltage stabilizing process of this utility model LED desk lamp control circuit is as follows: when the voltage in LED raises for a certain reason, voltage on the right side of resistance R5 can be made to raise, so that audion VT4 base voltage raises, VT4 collector voltage declines, the base voltage of VT2 declines, and VT2 collector voltage rises, and audion VT1 collector voltage declines, so that the voltage in LED declines, complete overvoltage voltage stabilizing process；If the voltage in LED declines for a certain reason, its voltage stabilizing process and said process contrast.

This utility model has following features: 1. formed delay circuit by R3, C2 and VT3, in the moment of start, VT1 turns on, in succession VT2 conducting, due to time-lag action, making BT3 end, VT4 first turns on, and establishes the supply voltage of LED, when the voltage in LED is increased to a certain degree, VT3 just begins to turn on, and the most just enters normal powered operation state, the overcurrent impact on whole circuit when effectively prevent start；2. closely similar with stabilivolt due to the characteristic curve of diode of giving out light, so D1 completely can be as stabilivolt, therefore this utility model is while utilizing D1 to do stabilivolt, also also serves as the dual function of power supply instruction；3. the effect of electric capacity C4 and resistance 7 series connection is the charging current utilizing C4, accelerates the conducting speed of audion VT3, after making start enter time delay, can enter stable duty as soon as possible, both prevent surge current, and the most do not affected the available machine time.

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. the LED desk lamp control circuit of a tape light，Including audion VT1、Resistance R1、Electric capacity C1、Light emitting diode D1 and LED，It is characterized in that，Described resistance R1 one end connecting triode VT1 emitter stage respectively、Electric capacity C1 and power supply VCC，The resistance R1 other end connecting triode VT2 base stage and audion VT4 colelctor electrode respectively，Audion VT2 colelctor electrode connecting triode VT1 base stage，Audion VT2 emitter stage connects resistance R2 and resistance R3 respectively，The resistance R3 other end connects electric capacity C2 and audion VT3 base stage respectively，Audion VT3 emitter stage connects electric capacity C4 and resistance R7 respectively，Audion VT3 colelctor electrode connects resistance R4，The resistance R4 other end connecting triode VT4 base stage and resistance R5 respectively，The resistance R5 other end connecting luminous diode D1 negative pole and diode D2 positive pole respectively，Diode D2 negative pole connects resistance R6，Light emitting diode D1 positive pole connecting triode VT1 colelctor electrode respectively、Electric capacity C3 and LED，The electric capacity C3 other end connects the resistance R6 other end respectively、Audion VT4 emitter stage、The resistance R7 other end、The electric capacity C4 other end、The electric capacity C2 other end、The resistance R2 other end and the electric capacity C1 other end.
2. The LED desk lamp control circuit of tape light the most according to claim 1, it is characterised in that described power supply VCC voltage is the 9V unidirectional current obtained after 220V electric main is changed.