CN202907266U - Slide touching-type dimming LED electric torch - Google Patents

Abstract

The utility model discloses a slide touching-type dimming LED electric torch comprising a LED string, a circuit drive unit and a dimming control unit, an input terminal of the circuit drive unit is connected with the dimming control unit, an output terminal of the circuit drive unit is connected with the LED string, the dimming control unit employs a slide touch induction strip as a control member, the slide touch induction strip is a capacitive touch induction strip, the circuit drive unit outputs corresponding PWM signals to control duty ratio of an external MOS transistor switch, and dimming of the LED is realized. Dimming technology without machinery movable members is employed, operation is more convenient, wearing and faults of the members can be prevented, simultaneously sealing property is good, waterproof dustproof function is provided, and practicality is strong.

Description

A sliding touch dimming LED flashlight

technical field

The utility model relates to an LED flashlight, in particular to a sliding touch-type dimming LED flashlight.

Background technique

At present, the LED flashlight dimming technology adopts magnetically controlled stepless dimming. The principle is to adjust the distance between the Hall element and the magnet, so that the Hall element can sense the strength of the magnetic field to change the size of the output signal, and then through the single-chip microcomputer (MCU). ) to control the duty cycle of the PWM signal after AD conversion to realize the dimming of the LED. This solution needs to use a mechanical mechanism, such as a rotating ring, to adjust the distance between the magnet and the Hall element. The moving process is prone to wear and mechanical failure, and it is difficult to achieve a waterproof design; Circuits are complex and expensive.

Utility model content

In order to solve the above problems, the utility model provides a sliding touch dimming LED flashlight, which applies sliding touch dimming technology to the flashlight, which is convenient to operate, adopts no mechanical moving parts, avoids mechanical wear, and has good sealing performance and practicality.

In order to achieve the above object, the technical solution adopted in the utility model is:

A sliding touch-type dimming LED flashlight, comprising an LED string, a circuit driving unit and a dimming control unit, the input end of the circuit driving unit is connected to the dimming control unit, the output end is connected to the LED string, the dimming The control unit is a sliding touch sensor bar, which adopts the dimming technology without mechanical moving parts, which makes the operation more convenient, avoids the wear and tear of the parts, and has good sealing performance.

Preferably, the sliding touch sensing bar is a capacitive touch sensing bar, and a plurality of touch capacitive switches are arranged on the sliding touch sensing bar, including a touch capacitive main switch and a plurality of touch capacitive brightness switches, and the touch capacitive switches depend on Sequentially arranged and combined into a sliding touch sensor bar, when the finger slides on the switch group, the capacitance of the touched capacitor changes, and the switching action is generated through internal circuit recognition, thereby realizing the output corresponding to different brightness.

Preferably, an LED indicator corresponding to the touch capacitive switch is also provided on the sliding touch sensing bar. A tiny LED indicator light can be designed on each switch to indicate the current brightness level.

Preferably, the sliding touch-sensitive strip is in the shape of a strip or a roller, which can be made into a ring to surround the flashlight, and its surface is covered under the shell material, and the sliding touch-sensitive strip can be hidden under the shell of the flashlight without damaging the appearance beauty.

Preferably, a MOS transistor is also connected between the circuit driving unit and the LED string, the output terminal of the circuit driving unit is connected to the control terminal of the MOS transistor, and a corresponding PWM signal is output to control the duty ratio of the MOS transistor switch to realize LED dimming.

The beneficial effects of the utility model are: the sliding touch dimming LED flashlight adopts the sliding touch dimming technology, adopts no mechanical moving parts, avoids mechanical wear and tear, has good sealing performance, and the surface of the capacitive touch strip is covered with a layer of shell material , so that the sliding touch sensor bar can be hidden under the shell of the flashlight, which not only maintains the aesthetics of the appearance design, but also does not affect the operation, making the operation more convenient, with waterproof and dustproof function and strong practicability.

Description of drawings

Fig. 1 is the schematic circuit diagram of the utility model sliding touch dimming LED flashlight.

Fig. 2 is a schematic diagram of the PCB layout of the sliding touch sensing bar of the present invention.

Fig. 3 is a circuit diagram of the utility model LED indicator light.

Detailed ways

Referring to Fig. 1, a sliding touch-type dimming LED flashlight includes an LED string 1, a circuit driving unit 2 and a dimming control unit 3, the input end of the circuit driving unit 2 is connected to the dimming control unit 3, and its output end is connected to the LED The string 1 is connected, and the dimming control unit 3 uses a sliding touch sensing bar 30 as a control component. The sliding touch sensing bar 30 is a capacitive touch sensing bar, and adopts a dimming technology without mechanical moving parts, which makes the operation more convenient and can Avoid wear and failure of components, and at the same time have good sealing, waterproof and dustproof functions, and strong practicability.

Specifically, a plurality of touch capacitive switches 31, 32 are provided on the sliding touch sensing bar 30, and the inside thereof is a switch based on a capacitor. Touching a capacitor with a conductive object (such as a finger) can change the capacitance, and this change will be built-in The basic principle, as detected by the circuitry inside the microcontroller, is a relaxation oscillator that is constantly charging and discharging. Without touching the switch, the relaxation oscillator has a fixed charge and discharge cycle, and the frequency is measurable. If we touch the switch with a finger or a stylus, the dielectric constant of the capacitor will increase, the charging and discharging cycle will become longer, and the frequency will decrease accordingly. Therefore, by measuring the change of the period, the touch action can be detected. The touch capacitor switches 31 and 32 on the sliding touch sensor bar 30 are divided into a touch capacitor master switch 31 and a plurality of touch capacitor brightness switches 32, and the touch capacitor switches 31 and 32 are arranged in sequence to form a sliding touch sensor bar 30. The switch 31 is responsible for opening and closing the circuit. When the finger slides on the switch group, the capacitance of the touched capacitor changes, and the switching action is generated through the internal circuit recognition, thereby realizing the output corresponding to different brightness.

2 to 3, a touch bar layout with seven-level dimming function, the first touch capacitive switch 31, 32 from the left is the master switch, and the second to eighth touch capacitive switches 31, 32 are respectively Corresponding to seven brightness switches with different ratios, the sliding touch sensor bar 30 is also provided with LED indicator lights 33 corresponding to the touch capacitance switches 31, 32, and a miniature LED indicator light 33 can be designed on each switch for Indicates the current brightness level. The size of the sliding bar PCB should be suitable for the size of the human finger and the size of the flashlight. When the finger touches the two sensing areas at the same time, the internal circuit can choose one of them.

Specifically, the sliding touch-sensitive strip 30 can be in the shape of a strip or a roller, and can be made into a ring to surround the flashlight. The sliding touch-sensitive strip 30 will not be directly exposed to contact with fingers, and its surface is covered with a certain thickness of plastic, glue, etc. Under the same shell material, the appearance design of the flashlight is kept beautiful.

Specifically, a MOS transistor 4 is also connected between the circuit driving unit 2 and the LED string 1, and the circuit driving unit 2 outputs a corresponding PWM signal, which controls the duty ratio of the switch of the external MOS transistor 4 to realize the regulation of the LED. Light.

Among them, the circuit with seven-level dimming function constructed by using SJT2012 capacitive touch sliding LED dimming IC, its working voltage is 2.5-5.5V, has seven-level sliding dimming and switching, status display, multiple button elimination, automatic memory , quick start, anti-interference and other functions. When the finger touches the switch K1-K7, the microcontroller recognizes the position of the effective switch and outputs the corresponding PWM signal, which controls the duty cycle of the switch of the external MOS transistor 4, so that the brightness of the LED string 1 changes. The number and voltage of the LED string 1 can be appropriately selected according to the purpose and power of the flashlight, and the circuit can also drive micro-power LED indicator lights 33 (LED1-LED7) to display the current brightness level position.

It can be seen from the above that the utility model applies the sliding touch dimming technology to the LED flashlight, adopts the capacitive touch sensing strip as the control switch, does not have any mechanical parts, does not wear out, prolongs the service life, and reduces the later maintenance cost. Its sensing part can be placed behind glass or plastic materials, and it is easy to make a touch-sensitive button that is sealed with the surrounding environment and is more convenient to use.

The above is only a preferred embodiment of the utility model, and the utility model is not limited to the above-mentioned embodiment, as long as it achieves the technical effect of the utility model by the same means, it should belong to the protection scope of the utility model.

Claims (6)

1. touch dimming LED (Light Emitting Diode) flashlight that slides, comprise LED string (1), drives unit (2) and dimming control unit (3), the input of described drives unit (2) is connected with dimming control unit (3), its output is connected with LED string (1), it is characterized in that: described dimming control unit (3) is slip touch sensible bar (30).

2. the touch dimming LED (Light Emitting Diode) flashlight of a kind of slip according to claim 1, it is characterized in that: described slip touch sensible bar (30) is capacitance touch induction bar, be provided with a plurality of touch capacitance switchs (31,32) on the described slip touch sensible bar (30).

3. the touch dimming LED (Light Emitting Diode) flashlight of a kind of slip according to claim 2 is characterized in that: described capacitance touch induction bar comprises that one touches electric capacity master switch (31) and a plurality of touch electric capacity luminance switchs (32).

4. according to claim 1 to the touch dimming LED (Light Emitting Diode) flashlight of 2 each described a kind of slips, it is characterized in that: described slip touch sensible bar (30) is provided with the LED light (33) corresponding with described touch capacitance switch (31,32).

5. according to claim 1 to the touch dimming LED (Light Emitting Diode) flashlight of 2 each described a kind of slips, it is characterized in that: described slip touch sensible bar (30) is strip or roller shape, and there is the covering of sheathing material on its surface.

6. the touch dimming LED (Light Emitting Diode) flashlight of a kind of slip according to claim 1, it is characterized in that: also be connected with a MOS transistor (4) between described drives unit (2) and the LED string (1), the output of described drives unit (2) connects the control end of MOS transistor, the duty ratio of output signal control MOS transistor.

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