The bedside table lamp is a bedside lighting fixture that can be seen everywhere in a modern family bedroom. At night, the bedside lamp is lit, a warm, romantic atmosphere is born instantaneously, and you can also meet the need of reading on the bedside. Modern desk lamp styles are endless, and are very creative, adding a lot of fun to family life. The following is a detailed introduction to the relevant knowledge of the bedside lamp and I hope to help you.
How bedside lamps work
The 220V power supply voltage is stepped down by the transformer T and the output AC voltage of 12V is filtered by the diode VD1 ~ VD4 rectifier capacitor C1. After the adjustable voltage regulator integrated block LM317 voltage regulator output stable adjustable voltage is used for the white light emitting diode LED1~LEDl5. Make the light adjustable This is composed of triode VT and potentiometer RP1 etc. The output voltage adjustment circuit uses triode as the adjusting element because the potentiometer with low insulation value and good resistance value is difficult to find the potentiometer that can only use the general dimming desk lamp Impedance is about 500kΩ, so it is impossible to adjust the voltage directly. Therefore, the transistor is used to adjust the voltage because the current through the resistor R1 and the collector of the transistor is 5mA, and the collector-emitter voltage of the transistor VT can be changed by adjusting the bias current. When the resistance value of the potentiometer RP1 is adjusted, the resistance of the resistor RP1 is set large, the emitter voltage becomes smaller, the output voltage becomes smaller, the collector voltage becomes larger, and the output voltage also becomes larger. Thus, the output voltage can be varied between 8 to 10V by adjusting. To realize the brightness adjustment of the luminous tube, the luminous tube is composed of three series connected in groups of five groups in parallel, since the maximum luminous efficiency of the white luminous tube is achieved. Pressed three 3.5V to 10.5V series arc tube into consideration each slightly different from the operating voltage of the arc tube so that the output power supply voltage takes a 10V.
Bedside lamp purchase tips
1. There is no ultraviolet light and infrared light in the spectral components
2, the color temperature of light should be close to nature
3, the light is no flash
There are three types of incandescent lamps for bedside table lamps: halogen lamps and fluorescent lamps. Three types of light sources have different pros and cons. Different people may like the light color and brightness of different light sources should be suitable for people to be able to project most of the light onto the desktop. Bedside lamp light source installation position is usually horizontal or down to the bedside table lamp in the normal working position, the main optical performance requirements are three points
1. When a person with shading is in a normal sitting position, the eyes of the shade and the light source should not be seen when looking from the horizontal direction
2, the desktop illumination requirements of the lamp work area should be ≥ 250lx minimum illumination should be ≥ 120lx
3, the illumination uniformity requirements should ensure that the illumination in the working area illuminated by the lamp is relatively uniform and does not produce a special light or dark spot. Only by ensuring the basic optical performance requirements of these three points can reduce the eye fatigue can be called a desk writing lamp. In addition to checking the optical performance of the table lamp, you should also check whether the other performance is acceptable. One pull, two shakes, three shakes, and four touch pulls means pull the power cord plug away from the socket and pull the power cord out of the socket to see the power cord. Whether the line is firm or not The power cord cannot be removed from the lamp compartment Adjusting the various working positions of the desk lamp No sound can be adjusted When adjusting The working position should be easily and reliably locked The panning means that the desk lamp is adjusted to the most unfavorable position Then gently shake the table lamp placed on the table to see if it is easy to overturn the table lamp is not good, it is easy to overturn the touch is to light the lamp for a period of time after 2 hours touch the lamp cover, etc. easy to touch when the heat-generating components are hot to It was accidentally burned when it was used in future.
Editor's summary: The bedside lamp work principle and bedside lamp purchase techniques are introduced here. For more information, you can follow this site information.
Table lamp bedroom bedroom lamp bedroom lamp
What about AC Cooling Fan?lLet's talk about it.
AC, referred to as AC. also known as " alternating current", referred to as "exchange." Generally refers to the size and direction of the cyclical changes over time voltage or current. Its most basic form is a sinusoidal current.Hippolyte Pixii created the first AC motor based on the principle of Michael Faraday by Michael Faraday in 1832
Frame:Aluminum Alloy
Impeller:PBT+30%GF
Lead Wire:AWG#22 UL 1007 (Optional)
Motor:Shaded Pole Induction Motor
Insulation:CLASS B
It can be used for ventilating or enhancing the heat dissipation in metallurgy, chemical industry, light industry, foodstuff, medical equipment, machinery equipment and civil buildings, etc. If the case is removed, it can also be used as a free fan, The pipes are installed in series in order to increase the pressure in the pipes.
cooling fan features:
Small cooling fans: low power consumption, fast cooling, low noise, energy saving and environmental protection. Because of its small size and more extensive use.
Large-scale cooling fan has a simple structure, solid and reliable, low noise, air volume, wide selection of features and so on.
Ac Cooling Fan,Ac Axial Cooling Fan,Mini Ac Ac Cooling Fan,Computer Accessories Ac Cooling Fan
Shenzhen Fusheng Motor Co.,Ltd , http://www.fushengfan.com