CN201074735Y - LED flashlight circuit - Google Patents

Abstract

The utility model discloses a LED flashlight circuit, which comprises a filter rectifier circuit and an LED lighting circuit, wherein the filter rectifier circuit can be connected with an external alternating current power supply; the input end of the booster circuit is connected with the anode of one battery, and the output end of the booster circuit is connected with the high-voltage end of the LED lighting circuit; the low-voltage end of the LED lighting circuit is grounded. The utility model discloses be connected with a battery and boost circuit between filter rectifier circuit and LED lighting circuit, the voltage of a battery is 1.2V, through boost circuit's the effect of stepping up, rises the required voltage of LED lighting circuit with 1.2V voltage, and the voltage that like now adopts the three section battery is 3.6V, so will save two batteries, and this will practice thrift a large amount of energy.

Description

A LED flashlight circuit

[technical field]

The utility model relates to an LED flashlight circuit.

[Background technique]

The flashlight is an indispensable lighting appliance in people's life. The bulbs of the flashlights are gradually using LEDs, which can save a lot of power consumption and increase the service life of the batteries. However, the current LED flashlights generally use three batteries connected in series. , will consume the electric power of three batteries, if only one battery can be developed to power the flashlight, it will be a great progress to deliver a large amount of energy.

[utility model content]

The utility model overcomes the disadvantages of the above-mentioned technologies, and provides an LED flashlight circuit which saves electric energy.

In order to achieve the above object, the utility model adopts the following technical solutions:

An LED flashlight circuit includes a filter rectifier circuit capable of being connected to an external AC power supply, and an LED lighting circuit, which is characterized in that it also includes a battery and a boost circuit, and the positive pole of the battery is connected to the high voltage of the filter rectifier circuit. The negative terminal of a battery is connected to the low-voltage terminal of the filter and rectifier circuit; the input terminal of the boost circuit is connected to the positive terminal of the battery, and the output terminal of the boost circuit is connected to the high-voltage terminal of the LED lighting circuit; The low-voltage end of the LED lighting circuit is grounded.

A LED flashlight circuit as described above is characterized in that a single-pole double-position switch is connected between the negative pole of the filter rectifier circuit and the low-voltage end of the LED lighting circuit, and the movable contact of the single-pole double-position switch is connected to the negative pole of a battery ; The first static contact of the single-pole double-setting switch is connected to the negative pole of the filter rectifier circuit; the second static contact of the single-pole double-setting switch is connected to the low-voltage end of the LED lighting circuit.

An LED flashlight circuit as described above is characterized in that the LED lighting circuit is composed of multiple LEDs and resistors connected in parallel.

The beneficial effects of the utility model are: the utility model connects a battery and a boost circuit between the filter rectifier circuit and the LED lighting circuit, and the voltage of a battery is 1.2V, and after the boost function of the boost circuit, the The 1.2V voltage rises to the voltage required by the LED lighting circuit. Like the current three-cell battery, the voltage is 3.6V, so two batteries will be saved, which will save a lot of energy.

[Description of drawings]

Below in conjunction with accompanying drawing and embodiment of the present utility model, further describe in detail:

Fig. 1 is the circuit diagram of the present utility model;

[Detailed ways]

As shown in the figure, an LED flashlight circuit includes a filter and rectifier circuit 1 that can be connected to an external AC power supply, and an LED lighting circuit 2. The LED lighting circuit 2 is composed of multiple LEDs and a resistor R3 connected in parallel.

The utility model also includes a battery 3 and a boost circuit 4, the positive pole of the battery 3 is connected to the high voltage end of the filter rectifier circuit 1, and the negative pole of the battery 3 is connected to the low voltage end of the filter rectifier circuit 1 The input terminal of the boost circuit 4 is connected to the positive pole of the battery 3, and the output terminal of the boost circuit 4 is connected to the high voltage end of the LED lighting circuit 2 (ie, the positive pole of the LED); the low voltage of the LED lighting circuit 2 Terminal (that is, the negative pole of the LED) is grounded. The filter and rectifier circuit 1 can filter and rectify the external AC power supply to charge a battery 3, and the voltage of a battery 3 is boosted by the booster circuit 4 to the voltage required by the LED lighting circuit 2, thus avoiding the use of three batteries. battery, saving a lot of power.

A single-pole double-set switch K is also connected between the negative pole of the filter rectifier circuit 1 and the low-voltage end of the LED lighting circuit 2, and the movable contact K1 of the single-pole double-set switch K is connected to the negative pole of a battery 3; The first static contact K2 is connected to the negative pole of the filter rectifier circuit 1 ; the second static contact K3 of the single pole double switch K is connected to the low voltage end of the LED lighting circuit 2 . When the moving contact K1 of the single-pole double-setting switch K is on the first static contact K2, an external AC power supply can charge a battery 3, and when it is fully charged, the moving contact K1 of the single-pole double-setting switch K is on the first static contact K2. Two static contacts K3, at this time, a battery 3 will supply power to the LED lighting circuit 2 for lighting.

Claims (3)

1. A LED flashlight circuit, comprising a filter rectifier circuit (1) capable of being connected to an external AC power supply, an LED lighting circuit (2), characterized in that it also includes a battery (3) and a boost circuit (4) , the positive pole of the one battery (3) is connected to the high voltage end of the filter rectifier circuit (1), and the negative pole of one battery (3) is connected to the low voltage end of the filter rectifier circuit (1); the booster circuit (4 ) is connected to the positive pole of the battery (3), the output end of the booster circuit (4) is connected to the high voltage end of the LED lighting circuit (2); the low voltage end of the LED lighting circuit (2) is grounded. 2. A LED flashlight circuit according to claim 1, characterized in that a single-pole double-set switch (K) is also connected between the negative pole of the filter rectifier circuit (1) and the low-voltage end of the LED lighting circuit (2). The moving contact (K1) of the double switch (K) is connected to the negative pole of a battery (3); the first static contact (K2) of the single pole double switch (K) is connected to the negative pole of the filter rectifier circuit (1) ; The second static contact (K3) of the single-pole double-setting switch (K) is connected to the low-voltage end of the LED lighting circuit (2). 3. The LED flashlight circuit according to claim 1, characterized in that the LED lighting circuit (2) is composed of a plurality of LEDs and resistors connected in parallel.

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