Working principle of desk lamp and function

< p > < / p > < p > lamp principle of work < / p > < p > after the 220 v power supply voltage by the step-down transformer T output 12 v ac voltage, the diode VD1 ~ VD4 rectifier, capacitor C1 after filtering, the adjustable voltage regulator integrated piece of LM317 voltage stability, adjustable output stable voltage for the use of white light-emitting tube LED1 ~ LEDl5. In order to make the light adjustable, here consists of triode VT and potentiometer elements such as RP1 output voltage regulation circuit. With triode adjustment is due to the switch, insulation performance is good, low resistance and the potentiometer is difficult to find, can only use the general dimmer lamp potentiometer, impedance at about 500 k Ω, so I can't to adjust the voltage directly, so use the triode. Adjust voltage method is: by resistor R1 and the transistor's collector current is 5 ma constant, this transistor VT set an emitter voltage can be adjusted by drift resistance to change. Emitter voltage decreases, the output voltage is smaller; Conversely, set a emitter voltage and output voltage is bigger. By regulating such output voltage can be change between 8 ~ 10 v, realize to adjust the brightness of the light tube. Luminous tube is composed of three series as a set, only five groups in parallel. Most of the white light-emitting tube working voltage in 3. 5 v, three light-emitting tube in series to 10. 5 v, considering each luminous tube working voltage is slightly different, so the regulated power supply output voltage from 10 v. < / p > < p > < / p > table lamp table lamp function, according to the use function classification are: reading lamp, decoration lamp, portable lamp. : < / p > reading lamp body shape concise light, is specially used to read and write desk lamp, the desk lamp general can adjust the height of the light pole, the direction of the light and brightness, mainly lighting reading function; < / p > decoration, luxurious appearance, materials and diverse styles, the lamp body structure is complex, used for ornament space effect, decoration and lighting are equally important. The desk lamp of bedroom already have gone beyond the value of the lamp itself, the desk lamp has become a rare works of art. Under the concept of light heavy adornment decorate, lamp decoration function is more obvious. < / p > entertainment: reading lamp in addition to reading, decoration. The latest science and technology also like robots, movement, can dance. Automatically adjust the light. Play music. Clock, video, touch, and other functions. < / p > < p > chaozhou xiang li electrical appliance factory specializing in the production of small night light light and night light, LED rechargeable small desk lamp socket. < / p > < p > the article source: li 3 c electric light a night light ea - gl。 com

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