CN203435209U - Single rechargeable battery light-emitting diode flashlight - Google Patents

Abstract

The utility model relates to a single rechargeable battery light-emitting diode flashlight. The single rechargeable battery light-emitting diode flashlight is characterized by comprising a 1.2V direct current power supply, a self-excited oscillator circuit, a rectification and filter circuit and a light-emitting component loop, wherein the self-excited oscillator circuit is composed of a transformer T, a resistor R1, an NPN type triode VT1, an NPN type triode VT2 and a resistor R2; the rectification and filter circuit is composed of a Schottky diode D1 and a capacitor C1; and the light-emitting component loop is composed of four light-emitting diodes LED1-LED4 and current-limiting resistors R3-R6. A storage battery of a common rechargeable light-emitting diode flashlight is short in service lifetime, and by means of redesign, the service lifetime of the rechargeable light-emitting diode flashlight is greatly prolonged. The circuit boosting part of the single rechargeable battery light-emitting diode flashlight is manufactured of common components, so that the cost is low; and nickel-cadmium batteries or nickel-hydrogen batteries can serve as the 1.2V direct current power supply.

Description

Single-unit rechargeable battery LED torch

Technical field

The utility model belongs to light-emitting diode application, is about a kind of single-unit rechargeable battery LED torch.

Background technology

Common chargeable LED torch, the light-emitting diode with 4 ￠ 5mm, carries charging plug, a lead-acid accumulators is used in the inside, flashlight with storage battery be not durable very much, less than 2 years just dying.The most of just storage battery wherein of this not reusable flashlight has been scrapped in fact, and other parts are all also intact, and the utility model redesigns circuit, and LED torch is significantly extended useful life.

Although there is light-emitting diode to have the special-purpose integrated circuit that boosts, as: BL8532, but its price is high and be not easy to have bought, therefore single-unit rechargeable battery LED torch circuit described in the utility model boosts, part is used common components and parts to make, price is also very cheap, and 1.2V DC power supply is used NI-G or Ni-MH battery all can.

Because light-emitting diode operating voltage is generally at 2.5～3.5V, and in flashlight, can not hold any more 3 batteries, so the utility model design increases a booster circuit, the voltage of 1.2V rechargeable battery is elevated to the operating voltage of light-emitting diode, for lighting 4 light-emitting diodes.

Below describe single-unit rechargeable battery LED torch described in the utility model related correlation technique content in implementation process in detail.

Utility model content

Goal of the invention and beneficial effect: common chargeable LED torch with storage battery be not durable very much, the most of just storage battery wherein of this not reusable flashlight has been scrapped in fact, other parts are all also intact, the utility model redesigns circuit, and LED torch is significantly extended useful life.The single-unit rechargeable battery LED torch circuit described in the utility model part of boosting is used common components and parts to make, and price is also very cheap, and 1.2V DC power supply is used NI-G or Ni-MH battery all can.

Circuit working principle: form self-excited oscillator by components and parts such as NPN type triode VTl～VT2, transformer T, Schottky diode D1, resistance R 1～R6 and electrochemical capacitor C1.

During NPN type triode VT1 cut-off, on the step-up coil L2 of transformer T, producing higher flyback voltage, after Schottky diode D1 rectification, electrochemical capacitor C1 filtering, is 4 light-emitting diode power supplies.The operating current of light-emitting diode is generally at lO～20mA, and after light-emitting diode operating current surpasses 25mA, can reduce useful life.In order to make the operating current of light-emitting diode stable, in circuit, set up by NPN type triode VT2 and resistance R 2 and formed constant-current circuit, to guarantee that rechargeable battery is when voltage just changes, can there is not too large variation in the operating current of light-emitting diode.

The resistance of current-limiting resistance R3～R6 is 8.2～1O Ω, be mainly used to the operating current of every light-emitting diode of balance, if the operating voltage consistency of 4 light-emitting diodes is very good, can directly use wire short circuit, need not connect these current-limiting resistances, the operating efficiency of circuit can be higher like this.

Technical scheme: single-unit rechargeable battery LED torch, it comprises 1.2V DC power supply, self-excited oscillator circuit, rectification and filter circuit, light-emitting component loop, it is characterized in that:

Self-excited oscillator circuit: it is by transformer T, resistance R 1, NPN type triode VTl, NPN type triode VT2 and resistance R 2 form, the anodal VCC of the different name end of transformer T feedback coil L1 and the Same Name of Ends connection circuit of step-up coil L2, the Same Name of Ends of transformer T feedback coil L1 connects the collector electrode of NPN type triode VTl and the base stage of NPN type triode VT2 by resistance R 1, the emitter connection circuit ground GND of NPN type triode VTl, the base stage of NPN type triode VTl is by resistance R 2 connection circuit ground GND, the collector electrode of NPN type triode VT2 connects the different name end of step-up coil L2, the emitter connection circuit ground GND of NPN type triode VT2,

Rectification and filter circuit: it is comprised of Schottky diode D1 and electrochemical capacitor C1, the positive pole of Schottky diode D1 connects the collector electrode of NPN type triode VT2, the negative pole of Schottky diode D1 connects the positive pole of electrochemical capacitor C1, the negative pole connection circuit ground GND of electrochemical capacitor C1;

Light-emitting component loop: it is comprised of 4 LED 1～LED4 and current-limiting resistance R3～R6, the positive pole of LED 1 connects the negative pole of Schottky diode D1 by current-limiting resistance R3, the negative pole of LED 1 connects the base stage of NPN type triode VT1; The positive pole of LED 1 connects the negative pole of Schottky diode D1 by current-limiting resistance R3, the negative pole of LED 1 connects the base stage of NPN type triode VT1; The positive pole of LED 2 connects the negative pole of Schottky diode D1 by current-limiting resistance R4, the negative pole of LED 2 connects the base stage of NPN type triode VT1; The positive pole of LED 3 connects the negative pole of Schottky diode D1 by current-limiting resistance R5, the negative pole of LED 3 connects the base stage of NPN type triode VT1; The positive pole of LED 4 connects the negative pole of Schottky diode D1 by current-limiting resistance R6, the negative pole of LED 4 connects the base stage of NPN type triode VT1;

The positive pole of described 1.2V DC power supply is by the anodal VCC of mains switch SW connection circuit, and the negative pole of 1.2V DC power supply is connected with circuit ground GND.

Accompanying drawing explanation

Accompanying drawing is the embodiment circuit working schematic diagram that the utility model provides a single-unit rechargeable battery LED torch; In accompanying drawing, the other pore of transformer T coil is expressed as coil Same Name of Ends.

Embodiment

According to single-unit rechargeable battery LED torch circuit working schematic diagram shown in the drawings and accompanying drawing explanation, and according to annexation between components and parts in the each several part circuit described in utility model content, and the components and parts technical parameter described in execution mode requires and circuit production main points are implemented to realize the utility model, below in conjunction with embodiment, correlation technique of the present utility model is further described.

The selection of components and parts and technical parameter thereof

β >=110 such as VT1 is NPN type triode, and the model of selecting is 2SC1815; VT2 is NPN type triode, and the model of selecting is 2SC9013 or 2SC8050 etc., ICM >=300mA, β >=160;

D1 is Schottky diode, and the model of selecting is 1N5819, also the 1A high-frequency rectification diode such as available FRI04;

C1 is electrochemical capacitor, and its capacity is 47 μ F, withstand voltage >=6.3V;

R1 is resistance, and its resistance is that 470 Ω, power are 1/4W; The resistance of resistance R 2 is 10 Ω; The resistance of current-limiting resistance R3～R6 is 8.2～10 Ω;

LED1～LED4 is 4 ￠ 5 white light-emitting diodes, requires technical parameter basically identical;

1.2V DC power supply requires the rechargeable battery that single-unit capacity is 500～1300mAh, uses NI-G or nickel-hydrogen chargeable cell all can.

Making main points and the circuit debugging of circuit

The making of transformer T: transformer T magnetic core uses high frequency bead, is used enamelled wire or the thin plastic wire coiling of diameter 0.2～0.3mm, and feedback coil Ll is around 10 circles, and step-up coil L2 is around 20 circles;

Whether, when circuit debugging, the adjustable stabilized voltage power supply of available output current >=0.1A replaces single-unit 1.2V rechargeable battery, observe LED 1～LED4 and be lit, if light-emitting diode does not work, carefully checks whether circuit welding is wrong;

If LED 1～LED4 still can not normally light, the two ends of the feedback coil Ll of transformer T or step-up coil L2 can be exchanged and tried it;

The brightness of LED 1～LED4 can regulate by resistance R 1, span 300～680 Ω of resistance R 1, and the recommendation resistance of the present embodiment resistance R 1 is 470 Ω;

If the operating voltage consistency of 4 LED 1～LED4 is very good, can directly use wire short circuit, need not meet current-limiting resistance R3～R6, the operating efficiency of circuit can be higher like this.

Claims (1)

1. a single-unit rechargeable battery LED torch, it comprises 1.2V DC power supply, self-excited oscillator circuit, rectification and filter circuit, light-emitting component loop, it is characterized in that:

Described self-excited oscillator electricity routing transformer T, resistance R 1, NPN type triode VTl, NPN type triode VT2 and resistance R 2 form, the anodal VCC of the different name end of transformer T feedback coil L1 and the Same Name of Ends connection circuit of step-up coil L2, the Same Name of Ends of transformer T feedback coil L1 connects the collector electrode of NPN type triode VTl and the base stage of NPN type triode VT2 by resistance R 1, the emitter connection circuit ground GND of NPN type triode VTl, the base stage of NPN type triode VTl is by resistance R 2 connection circuit ground GND, the collector electrode of NPN type triode VT2 connects the different name end of step-up coil L2, the emitter connection circuit ground GND of NPN type triode VT2,

Described rectification and filter circuit are comprised of Schottky diode D1 and electrochemical capacitor C1, the positive pole of Schottky diode D1 connects the collector electrode of NPN type triode VT2, the negative pole of Schottky diode D1 connects the positive pole of electrochemical capacitor C1, the negative pole connection circuit ground GND of electrochemical capacitor C1;

Described light-emitting component loop is comprised of 4 LED 1～LED4 and current-limiting resistance R3～R6, the positive pole of LED 1 connects the negative pole of Schottky diode D1 by current-limiting resistance R3, the negative pole of LED 1 connects the base stage of NPN type triode VT1; The positive pole of LED 1 connects the negative pole of Schottky diode D1 by current-limiting resistance R3, the negative pole of LED 1 connects the base stage of NPN type triode VT1; The positive pole of LED 2 connects the negative pole of Schottky diode D1 by current-limiting resistance R4, the negative pole of LED 2 connects the base stage of NPN type triode VT1; The positive pole of LED 3 connects the negative pole of Schottky diode D1 by current-limiting resistance R5, the negative pole of LED 3 connects the base stage of NPN type triode VT1; The positive pole of LED 4 connects the negative pole of Schottky diode D1 by current-limiting resistance R6, the negative pole of LED 4 connects the base stage of NPN type triode VT1;

The positive pole of described 1.2V DC power supply is by the anodal VCC of mains switch SW connection circuit, and the negative pole of 1.2V DC power supply is connected with circuit ground GND.

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