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According to the control of the LED drive current output terminal, it can be divided into three kinds of dimming modes. The control circuit can also be divided into analog control and PWM control. The control circuit is usually realized by a microcontroller.
First, the main dimming technology of LED lamps The first mode of dimming is to adjust the LED driving current to achieve dimming of LED lights, because the brightness of LED chips is proportional to the LED driving current.
The second type of dimming is often referred to as analog dimming or linear dimming. The advantage of the dimming mode is that when the driving current is linearly increased or decreased, the influence of the driving current overshoot on the LED chip is relatively reduced, and the control circuit has strong anti-interference. The disadvantage is that the magnitude of the drive current will have a certain effect on the color temperature of the LED chip.
The third mode of dimming is pulse-light modulation (PWM). In this way, the driving current is square wave-shaped by a certain control, and the pulse width is variable. The pulse width is adjusted to change the time during which the LED lamp is continuously lit, and the output power is also changed, thereby achieving the purpose of energy saving. The frequency is generally controlled at 200 Hz to 10 kHz. Due to the retention of human eye vision, the flicker of the light source during the dimming process is not felt. The advantage of this dimming method is that it can improve the heat dissipation of the LED. The disadvantage is that the overshoot of the driving current has a certain influence on the life of the LED chip.
Second, the composition of the dimming system and the future development of intelligent control should have manual control, intelligent control, light control, time control and fault alarm control. When the sun goes down, the sky will automatically light up. After 12 o'clock in the morning, the illumination of the lamp can be automatically halved. After dawn, the lamp can be automatically extinguished; in special cases, the person can manually control; in the event of a malfunction of the lamp, the control system Can automatically alarm.
The intelligent dimming system is mainly composed of a server, a central controller, a single-chip controller and a signal detection circuit.
Server: It consists of upper computer and upper computer software, mainly realizes monitoring operation and alarm function. The server is located in a control center such as street lamp management, and its connection with the central controller can be by power carrier, network or wireless.
PP plastic, polypropylene, commonly known as "baijiao",Scientific name: polypropylene.
Description:
PP Plastic is a kind of semi crystalline material. It is more hard than PE and has a higher melting point. Due to the high crystallinity, the surface of the material stiffness and resistance to scratch characteristics very well. PP Plastic don't have the problem of environmental stress cracking.Polypropylene (PP Plastic) is a semi-crystalline thermoplastic.PP Plastichas high impact resistance, strong mechanical properties, resistance to many organic solvents and acid and alkali corrosion.
PP Plastic is widely used in industry and is one of the most common polymer materials.
Australian COINS are also made of polypropylene.
Polypropylene bonding:
K-720 is suitable for polypropylene PP plastic adhesion, suitable for large area plate lamination, high transparency, suitable for PP adhesion PP, PP adhesive PC, PP adhesive ABS,PP adhesive PVC, PP adhesive acrylic, PP sticky metal, PP stick wood.
K-7007 adhesion performance is roughly the same as k-720, light yellow and more economical.
K-620 is adhesive small area polypropylene PP glue, must be used with the k-650 treatment agent, the instant positioning, the strength is high.
Advantages:
1. Low density;
2. Heat resistance ;
3. Non deformation;
4. High stiffness;
5. High surface strength;
6. Good chemical stability;
7. Nontoxic and safe.
Disadvantage:
The main disadvantage of the fault polypropylene is that the high temperature rigidity is not enough, and the low temperature is brittle.
Poor environmental tolerance, outdoor use, easy to turn yellow and brittle.
Tensile strength of anisotropy, the products are easy to deform, continuous use of low temperature, high creep performance, and long - term load.
Poor printing performance.
Application:
1,Valve part, drinking water and sewage water pipe,
2,Sealing element, spraying carrier,
3,Corrosion-resistant trough and barrel, industrial applications that have acid and alkali-resistant requirement; wastewater and gas discharge equipment for industrial purpose,
4,Scrubbing tower, clean room, semiconductor plant and other related industrial equipment and machinery, food machinery and chopping board,
5,Electroplating process, toy part
Combustion characteristics: PP Plastic easy to burn, polypropylene from continue to burn after the fire, with the top of the flame is yellow, the bottom made in blue, with a small amount of smoke generated, burning melt dripping, and oil.
Specification: the thickness of PP sheet material can be produced from 0.3mm to 2mm, and the PP sheet material is of rolling material and width of 500-1000mm.
The thickness of the plate can be produced from 2mm to 200mm. The specification is 600*1200mm 1000*1000mm 1000* 2000mm. Other specifications can be customized as needed,and The diameter of the PP rod can be produced from 2mm to 250mm, the length is 1 meter, PP rod can be ordered to be more than 3 meters in length.
Color: white and black, other colors can be customized
Modified varieties: PP sheet have various enhancers and other auxiliaries can be added to make modified varieties, depending on the requirements
Storage methods:
Keep in tight, cool and dry place to ensure good ventilation
Product certification: most environmental certification reports and safety reports for raw materials, such as SGS report, CTI report, UL report, MSDS safety information, etc.
Pp Plastic Rod,Polypropylene Plastic Rod,Extruded Polypropylene Plastic Rod,Pp Plastic Welding Rods
Dongguan Noegem Plastic Products Co.,Ltd , https://www.noegempLastic.com