CN201037611Y

CN201037611Y - LED desk lamp with automatic light stabilizing function

Info

Publication number: CN201037611Y
Application number: CNU2007200695129U
Authority: CN
Inventors: 费子翔
Original assignee: FEI ZIXIANG DENG JING
Current assignee: FEI ZIXIANG DENG JING
Priority date: 2007-04-29
Filing date: 2007-04-29
Publication date: 2008-03-19
Anticipated expiration: 2017-04-29

Abstract

The utility model relates to a LED table lamp, particularly relating to a LED table lamp with automatic light stabilization capability. The utility model comprises a power circuit and LEDs, wherein, the power circuit which converts the alternating current to the direct current and is depressured by a voltage stabilizer tube powers the LEDs to glow; the utility model is characterized in that the LED table lamp with automatic light stabilization capability is also comprises a brightness control circuit, wherein, the brightness control circuit comprises a single chip processor, an infrared detecting module, a photosensitive testing circuit and a drive circuit; the infrared detecting module can detect a human body; if detected, the infrared detecting module outputs up level; if not detected, the infrared detecting module outputs low level; the output signals are transmitted to the single chip processor; the photosensitive testing circuit can test ambient lights, the output signals are also transmitted to the single chip processor; the single chip processor which is the main control unit processes the input signals and controls the LEDs to glow and go out by the drive circuit. The utility model has the advantages that the utility model can automatically regulate the brightness of the table lamp by testing the brightness of the ambient lights, which can protect eyes; the utility model can be automatically turned off when people leave, thereby saving energy.

Description

LED desk lamp with automatically steady light function

Technical field

The utility model relates to a kind of LED desk lamp (the LED desk lamp is hereinafter to be referred as the LED desk lamp), relates in particular to a kind of LED desk lamp with automatically steady light function.

Background technology

Existing desk lamp is generally incandescent lamp or fluorescent lamp, and wherein incandescent lamp has been realized with an automatic light meterly by photo resistance and controllable silicon, but its shortcoming mainly is: the first, and incandescent lamp is a thermal light source, and luminous efficiency is low, and energy waste is serious; The second, the desk lamp that this class is with an automatic light meter does not possess the infrared induction function, has wasted the unnecessary energy when forgetting to turn off the light.Although fluorescent lamp is than incandescent lamp luminous efficiency height, the resistance-type light modulation is adopted in its light modulation more, can not reach energy-conservation effect, and flicker from fluorescent lighting is more serious, is unfavorable for vision protection, and the function of automatically steady light does not have.

A kind of LED desk lamp that developed recently gets up be subject to people's attention with advantages such as its luminous efficiency height, no stroboscopic, life-span length, but because the LED lamp is a kind of newer light source, its product function is also more single.The LED desk lamp great majority that can see at present only possess switching function, can carry out the considerably less of manual light modulation, and not possess the infrared induction function.

The utility model content

The purpose of this utility model is to provide a kind of LED desk lamp with automatically steady light function, and this LED desk lamp can the brightness of testing environment light be adjusted desk lamp brightness automatically, and the energy eyeshield can be turned off the light after the people leaves, automatically with energy savings.

The utility model is achieved in that a kind of LED desk lamp with automatically steady light function, comprise power circuit and LED, after power circuit becomes alternating current into direct current, luminous through the voltage-stabiliser tube step-down for LED, it is characterized in that: described LED desk lamp with automatically steady light function also comprises intednsity circuit, and intednsity circuit comprises single-chip microcomputer, infrared detection module, photosensitive detection circuit, drive circuit; But infrared detection module perception human body, if there is the people then to export high level, nobody is output low level then, output signal is delivered to single-chip microcomputer and handles; But photosensitive detection circuit testing environment light, detection signal also is delivered to single-chip microcomputer; Single-chip microcomputer is a main control unit, to the input signal computing after drive circuit control LED light on and off.

Also comprise the voltage-stabiliser tube that the control circuit operating voltage is provided in the described mu balanced circuit, power voltage supply single-chip microcomputer, infrared detection module and the photosensitive detection circuit of this voltage-stabiliser tube output.

Described photosensitive detection circuit comprises modulus conversion chip U2, photo resistance R3, fixed value resistance R5, potentiometer R4 and fixed value resistance R6, photo resistance R3 and fixed value resistance R5 are connected into bleeder circuit, the CH1 passage of output termination modulus conversion chip U2 in the middle of this bleeder circuit; Potentiometer R4 and fixed value resistance R6 also form bleeder circuit, and output connects the CH0 passage of modulus conversion chip U2 in the middle of it.

Described drive circuit is a Darlington transistor.

The utility model makes it compared with prior art owing to adopted above-mentioned technical scheme, and the utility model can if extraneous light is darker, then can be adjusted desk lamp brightness and strengthen thereupon by the brightness of photo resistance testing environment light, reaches then no longer increase after the predetermined value; Vice versa, realized the constant of environmental light intensity.Also have manual dimming function simultaneously, can be according to the concrete hand-operated forced property of needs adjusting desk lamp brightness.Whether the someone existed around the utility model can also be responded to it, if after the people left, through a little time-delay, desk lamp can extinguish automatically with the conservation of power resource.

Description of drawings

Fig. 1 is the control principle figure that the utlity model has the LED desk lamp of automatically steady light function;

Fig. 2 is the LED desk lamp circuit diagram that the utlity model has automatically steady light function.

The specific embodiment

The utility model is described in further detail below in conjunction with the drawings and specific embodiments.

Referring to Fig. 1, Fig. 2, a kind of LED desk lamp with automatically steady light function, comprise power circuit, single-chip microcomputer, infrared detection module, photosensitive detection circuit, drive circuit, LED, single-chip microcomputer, infrared detection module, photosensitive detection circuit, drive circuit have been formed intednsity circuit.

Power circuit comprises power module, two voltage-stabiliser tubes, diode, electric capacity, power module U4 changes the 220V alternating current into the 12V direct current, with a voltage-stabiliser tube U5 12V is reduced to 8V again, then through diode D33 step-down, 7.2V voltage to LED power supply has just been arranged, and voltage-stabiliser tube U6 provides other circuit as 5V operating voltage that single-chip microcomputer, infrared detection module and photosensitive detection circuit use.U4 selects 220S12 integrated power supply module for use, and U5 selects MC78L08 for use, and U6 selects LM7805 for use, and D33 is 4148.The voltage-stabiliser tube two ends connect an electric capacity respectively can the filtering clutter, obtains voltage stably.

But infrared detection module U3 perception human heat, 1 pin of infrared detection module U3 connects positive source, and 3 pin connect power cathode, and 2 pin are signal output port.Output signal directly being linked the P1.3 port of single-chip microcomputer handles.Nobody the time, the 2 pin output low levels of infrared detection module U3 lost efficacy the PWM ripple after single-chip microcomputer is handled, LED extinguishes.Man-hour is arranged, the 2 pin output high level of infrared detection module U3, single-chip microcomputer makes the PWM ripple effective after handling, thus LED lights.

But photosensitive detection circuit testing environment light.Photosensitive detection circuit comprises modulus conversion chip U2, photo resistance R3, fixed value resistance R5, potentiometer R4 and fixed value resistance R6.Photo resistance R3 and fixed value resistance R5 are connected into bleeder circuit, the CH1 passage of output termination modulus conversion chip U2 in the middle of this bleeder circuit; When extraneous light deepening, the R3 resistance increases, R3 and R5 tie point voltage can change, get data signal after the modulus conversion chip U2 output conversion, the P1.7 port that is input to single-chip microcomputer U1 with serial mode is handled, single-chip microcomputer compares input value and the standard value that is stored in the single-chip microcomputer, and relatively the bright dark of LED controlled at the PWM ripple of the 9th pin output different duty of single-chip microcomputer in the back, the effect of realization stable environment light.Modulus conversion chip U2 selects ADC0832 for use.Simulate the variation of photosensitive resistance with a potentiometer, equally this analog signal is carried out analog-to-digital conversion and be input to single-chip microcomputer and just can realize manual dimming function.Its circuit is achieved in that potentiometer R4 and fixed value resistance R6 also form bleeder circuit, and output connects the CH0 passage of modulus conversion chip U2 in the middle of it.

Single-chip microcomputer is a main control unit, and single-chip microcomputer is selected AT89C2051 for use, and its crystal oscillator adopts 12MHz.Switch S 2 is used for selecting manual light modulation or automatically steady light, and when S2 pressed, single-chip microcomputer P1.2 port obtained high level, and single-chip microcomputer is handled the back modulus conversion chip U2 is carried out the initialization setting, selects for use the CH0 port to carry out manual light modulation.When S2 does not press, single-chip microcomputer P1.2 port is a low level, and it is with an automatic light meter that single-chip microcomputer initialization modulus conversion chip U2 selects for use the CH1 port to carry out.Button S3 and S4 are used for setting the steady light effect of user's expectation.S3 presses, and stablizes light and strengthens; S4 presses, and stable light dies down.

Because the P3.5 port of single-chip microcomputer output PWM ripple can not directly drive the LED desk lamp of being made up of 32 LED lamp pearls, comes this pwm signal is amplified and driving LED lamp pearl array so use a Darlington transistor Q1, Darlington transistor Q1 selects 2N7053 for use.LED lamp pearl is selected the astigmatic luminous tube diode of high brightness for use, and the voltage of each lamp pearl is 3.6V, and lighting operating current is 30mA, adopts 2 LED fluorescent tube series connection, carries out parallel connection with 16 groups again and drives.

Above-mentioned modulus conversion chip U2 also can adopt 8 integrated modulus conversion chips of TLC0832CP two passages.

Above-mentioned Darlington transistor Q1 also can adopt TIP41C NPN type Darlington amplifying triode.

The automatically steady photocontrol that the utlity model has the LED desk lamp of automatically steady light function is not only applicable to the LED desk lamp, and can also be applied to chamber lamp, corridor lamp and street lamp etc., has wider range of application.

Claims

1. A kind of LED desk lamp with automatic light stabilizing function, comprises power supply circuit and LED, after the power supply circuit changes alternating current into direct current, provides LED to emit light through voltage regulator tube step-down, it is characterized in that: described with automatic light stabilizing function The LED desk lamp also includes a brightness control circuit. The brightness control circuit includes a single-chip microcomputer, an infrared detection module, a photosensitive detection circuit, and a driving circuit; the infrared detection module can sense the human body. It is sent to the single-chip microcomputer for processing; the photosensitive detection circuit can detect the ambient light, and the detection signal is also sent to the single-chip microcomputer; the single-chip microcomputer is the main control unit, and after the input signal is calculated, it is controlled by the driving circuit to turn on and off the LED.

2. The LED desk lamp with automatic light stabilizing function according to claim 1, characterized in that: the voltage stabilizing circuit also includes a voltage stabilizing tube that provides the working voltage of the brightness control circuit, and the output voltage of the voltage stabilizing tube supplies power to the microcontroller, infrared A detection module and a photosensitive detection circuit.

3. The LED desk lamp with automatic light stabilizing function according to claim 1, characterized in that: the photosensitive detection circuit includes an analog-to-digital conversion chip U2, a photosensitive resistor R3, a fixed value resistor R5, a potentiometer R4 and a fixed value resistor R6, The photosensitive resistor R3 and the fixed value resistor R5 are connected in series to form a voltage circuit, and the middle output terminal of the voltage divider circuit is connected to the CH1 channel of the analog-to-digital conversion chip U2; CH0 channel of digital conversion chip U2.

4. The LED desk lamp with automatic light stabilizing function according to claim 1, characterized in that: the driving circuit is a Darlington tube.