1. Introduction to solar cells
Solar cells are developing rapidly. In the next 10 years, the average conversion efficiency of solar cells will reach about 30%, while the price will drop by more than half. Half of the lighting power can come from solar energy, reaching true green lighting from PN junctions to PN junctions. The solar cell is a huge PN junction. The LED is a PN junction that can convert electrical energy into light. Its conversion efficiency will be able to reach the level of energy-saving lamps in the future, and its service life can reach more than 100,000h. This is the real green. illumination.
2. The function of the solar battery
Solar cells mainly have the following functions:
1) Battery overcharge and overdischarge protection;
2) Automatically restore the discharge function after charging;
3) Anti-reverse charge (battery charging to solar battery);
4) Temperature compensation function;
5) Automatically turn on and off the light function (turn on at night and cut off load during the day);
6) Maximum 5A discharge current.
3. Solar green lighting circuit
The core of time-sharing and voltage-dividing control solar lamp technology is to control the input power of solar lamps according to the different requirements of people's contrast at different time periods in the night and the size of solar cells' energy absorption sites during the day, so as to meet the requirements of designing with minimum cost. The purpose of the most basic requirements for solar lights under the worst weather conditions.
The control circuit is suitable for a lawn lamp with 12 LEDs as a light source. Ul includes circuits such as turbulence, light control detection, pulse width modulation, and battery voltage detection. The pin 1 is the enable terminal, the pin 2 is the power supply voltage, the pin 4 is the load current adjustment port, the pin 5 is the opening and closing door, the pin 8 is the grounding terminal, and the pins 3, 6 and 7 are all floating. Changing the resistance of R4 can change the operating current of the LED. The most allowable current is 50OmA, and the current is the lowest when R4 is grounded.
J1 is a solar battery, J2 is a power switch, and J3 is a 2-cell Ni-MH battery. In order to reduce the tube voltage drop, Schottky diodes can be used for vDI and VDZ. Change R5, R6 can adjust the partial pressure protection value of the battery, change Chuan, RZ adjustable time-sharing value. This circuit can guarantee the lighting time on the basis of reducing the solar battery cost as much as possible, and has a very high cost performance.
The purpose of door and window sealing strip Pvc Strip,Transparent Pvc Strip is divided into three categories: glass sealing strip (rubber strip), door leaf and door cover sealing strip and wool strip. The glass sealing strip is used for the sealing between glass and leaf and frame, the door leaf and door cover sealing strip is mainly used for the sealing between door panel and door frame, and the wool strip is mainly used for the sealing between frame and leaf. In the production and installation of plastic steel doors and windows, broken bridge aluminum doors and windows and wooden doors, sealing strip is an essential accessory.
The sealant strip plays an important role in waterproof, sealing and energy saving in plastic steel doors and windows, bridge broken aluminum doors and windows and wooden doors and windows, with sound insulation, dust prevention, antifreeze and warmth preservation. It must have strong tensile strength, good elasticity, and good temperature resistance and aging resistance. In order to ensure the fastening of the rubber strip and the profile, the section structure size of the rubber strip must match the profile of plastic steel doors and windows. Sealant strips are generally used for flat doors and windows, suspended windows and folding doors and windows. The main functions are dust prevention, insect prevention, waterproof, sound insulation, sealing, etc.
The installation position of the wool top is generally on the sliding window (door) leaf, the circumference of the frame leaf or the sealing bridge (wind block) to enhance the sealing between the frame and the leaf. Top specification is an important factor affecting the and watertight performance of push-pull doors and windows, and it is also an important factor affecting the switching force of doors and windows. If the wool top specification is too large or the vertical wool is too high, it will not only make assembly difficult, but also increase the moving resistance of doors and windows, especially the initial resistance when opening and the final positioning resistance when closing. If the specification is too small, or the height of the vertical top is not enough, it is easy to fall out of the groove, which greatly reduces the sealing performance of doors and windows.
There are two kinds of tops: silicified and non silicified. The top after silicified treatment has better effect in use. The appearance of the top with qualified quality is that the surface is straight, the bottom plate and vertical hair are smooth and free of bending, and there are no pits on the bottom plate, which meets the requirements of 0.2mm.
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