Xiaoli potted culture method:
Potted plants: Small flowers should be selected for the dwarf varieties. The potting soil should be made up of 5 parts of garden soil, 3 parts of fine sand or slag, and 2 parts of stacking fertilizer. The bottom of the pot should be crushed with tiles as drainage layer. The seedlings are made of 10 cm pots, and the seedlings are poured with a thin cake of fertilizer. After the seedling height is 20 cm, the pots are changed twice before the buds are removed. Each time a new humus soil is added to fill the pots.
Sufficient light: Xiaolihua guarantees 6-10 hours of light every day. If it is blocked for a long time and the light is insufficient, it will grow poorly, with less flowers and easy to get sick.
The environment is cool: Xiaolihua is cold and hot, and the temperature in northern China is more suitable. It will bloom from summer to autumn, while the Yangtze River valley, in summer, is in a semi-dormant state. It must be shaded by leaves and sprayed to cool down.
Dry and wet evenly: Xiaolihua is flourishing and consumes a lot of water. If there is water shortage to strengthen the light, the leaves will be burnt and the leaves will be heavy. If the water is too much, the roots will be rotten, so the soil will not dry and not wet. In the summer, there should be more watering in the summer, less spring and autumn, anti-water accumulation in the rainy days, high pots, and no or no watering before the autumn harvest.
Diligent application of thin fertilizer: Xiaolihua Xifei, in addition to the application of base fertilizer, in addition to the midsummer, in the growing season, 10% of the cake every 10-15 days of fertilizer, after the bud, apply 1%-3% potassium dihydrogen phosphate to promote color Gorgeous.
Pruning: When cultivating a single small flower, remove the lateral buds and leave the main branches. The potted plants should control the height. All the axillary buds are removed from the base, and the flowers are picked up with the long buds. When cultivating four small flowers, when the seedling height is 10-15 cm, the base is left with 2 knots to make it form 4 side branches, and only one top bud is left for each side branch, and 4 flowers can be opened. If you want to bloom in the National Day, you can update the pruning after the flowering in early July, first break the branches to be cut, leave about 20 cm high, cut it after wilting, properly control the water after cutting, and according to the culture requirements. Topping, general care for 2 months, can bloom on National Day.
In the application process of high-power LED products and devices, heat dissipation, electrostatic protection, and welding have a great influence on their characteristics, and they need to be highly valued by application-side customers.
Heat dissipation
Due to the limitation of semiconductor light-emitting diode chip technology, the photoelectric conversion efficiency of LEDs needs to be improved, especially for high-power LEDs. Because of their higher power, about 60% of the electrical energy will be released as heat (with the development of semiconductor technology, The photoelectric conversion efficiency will gradually increase), which requires end customers to do a good job of heat dissipation when applying high-power LED products to ensure the normal operation of high-power LED products.
1. Heat sink requirements.
Appearance and material: If the sealing requirements of the finished product are not high, it can directly convection with the outside air environment. It is recommended to use finned aluminum or copper heat sinks.
2. Effective heat dissipation surface area:
For 1W high-power LED white light (other colors are basically the same), it is recommended that the total effective heat dissipation surface area of the heat sink is ≥50-60 square centimeters. For 3W products, it is recommended that the total effective heat dissipation surface area of the heat sink is ≥150 square centimeters. Higher power depends on the situation and test results. Try to ensure that the temperature of the heat sink does not exceed 60°C.
3. connection method:
When connecting the high-power LED substrate and the heat sink, please ensure that the two contact surfaces are flat and in good contact. In order to strengthen the combination of the two contact surfaces, it is recommended to coat the bottom of the LED substrate or the surface of the heat sink with a layer of thermal grease (thermal conductivity of thermal grease) ≥3.0W/mk), thermally conductive silicone grease shall be applied evenly and in an appropriate amount, and then fixed with screws.
welding
1. When soldering, please note that it is best to choose a constant temperature soldering iron, the soldering temperature is below 260℃, and the contact time between the soldering iron and the LED pad should not exceed 3S;
2. For high-power LEDs encapsulated by silicone, the maximum heat-resistant temperature of silicone is 180°C, so the soldering temperature of the LED should not exceed 170°C. Use low-temperature soldering iron and low-temperature solder paste (wire) for soldering, and the soldering iron is in contact with the LED pad at one time The time does not exceed 3S.
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