标签：high output white led

Using high output white led to improve bulb efficiency

Using high output white led to improve bulb efficiencyUsed as the light bulb to replace the threaded-in incandescent bulbs has many advantages. In general, Small (5-9) LED series, led high bay, the use of a power line voltage is converted to low voltage (typically a few tens of volts), when the current is about 350 to 700mA. In determining how best to to let the user to the same line voltage isolation process, we need careful consideration, weighing the pros and cons. We can achieve power isolation, such isolation can also be in the LED installation process. In some low-power design, high output white led, the LED physical isolation is a common method, because it allows the use of lower cost non-isolated power. high output white led

LED manufacturers to create a higher voltage by the number of LEDs in series in a public light. These high-pressure light to bring power efficiency or lower cost or higher.Use of these high-pressure product, we simply use a rectifier and a steady flow resistance in order to achieve a more low-cost power. While this power can produce a very good power factor, low efficiency, because a large part of the input voltage is used in the steady flow resistance, high output white led, resulting in 30% -50% of the LED power loss. However, it can be used for small-volume, low-power applications. However, in some high-power applications, the low efficiency is allowed to no avail. Figure 3 shows an alternative method: the use of a boost power supply. Most of the circuits with the same method as above. However, the loss of the switch, diode and current sense is much smaller, up to 90% to 95% efficiency. In addition, high output white led, the circuit also has a good power factor of 97%.

In short, high voltage LED because of its low power consumption, temperature characteristics of small, can help to increase the service life of LED bulbs screw. It is the alternative step-down power, thereby improving the power efficiency achieved through the use of the boost power supply. Boost power loss is about half of the buck regulator. In addition, fewer components of the boost power supply, power factor is better,high output white led, smaller and easier to achieve dimming and triac switch components.

High output white led’s big trouble: over heating

 

High output white led’s big trouble: over heating

 

LED industry in the past in order to get the full white LED beam, once the development of large-size LED chips trying to take this way to achieve the desired goals. But, in fact, exert power white LED lasts for more than 1W beam but will drop 20 ~ 30% reduction in the relative luminous efficiency. In other words, if the brightness of the High output white led is several times larger than traditional LED power consumption characteristics beyond the fluorescent , you need to overcome the following four topics: inhibit the temperature rise to ensure that the service life, improve the luminous efficiency, and luminescence Properties of equalization.

Temperature rise solution to the problem is to reduce the package thermal impedance; to maintain the service life of led high bay is to improve the chip shape, a small chip; improve the LED luminous efficiency of the method is to improve the chip architecture, small chip; The luminescence properties homogenizationthe method is to improve the LED packaging methods, these methods have been developed one after another.

For light-emitting characteristics of uniformity, is generally believed to improve High output white led uniform concentration of fluorescent material and the phosphor production technology should be able to overcome this trouble. As described above to improve the applied power at the same time, it is necessary to try to reduce the thermal resistance, improved heat dissipation problem. The specific contents are: to reduce the chip to the package thermal impedance, inhibiting the thermal resistance of the package to the printed circuit board, chip cooling smooth.

3-point shot like high output white led

Usually “pointers” refers to a basketball game, shooting outside the three-point line and hit the goal. Specific requirements for take-off feet beyond the three-point line, landing in less than three-point line, but also outside the three-point line. Take-off can not step on the three-point line.

3-point shot like high output white led

high output white led is one of led streetlight. But 3-point shot like high output white led? I think,  high output white led should be more useful for our life.

20 years ago, the NBA decided to draw a three-point line on the pitch, the bottom line of the three-point line distance is 22 feet (6.71 meters), the arc distance is 23 feet 9 inches (7.24 meters). Since then, the three-point shot to bring a revolutionary change of the NBA game. Three-point shot originated in the United States Basketball League (ABL ,1961-63 years), and later adopted by the ABA (1967-76), the NBA until the 1979-80 season, before the formal introduction of pointers mechanism, when the three -point shot is just the regular season experimenting. This new approach to shooting a great impact in the NBA, the 1980-81 NBA season to fully accept the system of three-pointers, only in the 1994-95 season and 1995-96 season, there are some small changes, the two season three-point line is 22 feet from the unified are. (FIBA international competitions in 1984 the introduction of three-pointers mechanism, the distance of the three-point line is 20 feet 6 inches, about 6.25 m.)

Thirds vote the ball the most critical points; a movement of the hands must pay attention to the forearm and after the arm into a 90 degree angle, the direction of the elbow and you and the basket between a straight line. Another is the strength of the wrist. The beginning of the wrist are not strong enough, then you can borrow a little arm strength to pitch. Usually do an action – “hands flat on the wrist clasp wrist up and down, as if waving wings. Of course, very important point, that is, adhere to the “.

Display, traffic signal light application of high output white led have a seismic impact resistance, optical response speed, power saving and long life characteristics, widely used in various indoor and outdoor display, divided into full-color, two-color and monochromedisplay, a total of over 100 units in the development and production. Traffic lights with ultra-high brightness red, green, yellow LED, because high output white led is energy saving, high reliability, nationwide, traffic lights are gradually upgrading, and promotion speed is in great demand. is a good market opportunity.

1, three-pointers is the amateur’s easy to overlook, but in fact a very important technical and tactical use of three-pointers to give the team’s play a considerable number of changes for individuals to master the three-pointers the creation of the individual scoring opportunities in the regular game and increase the defense difficulty. , Any technology comes from the extremely hard training and time to accumulate only the harvest, a daily average of 100 pointers to vote to improve their technical, showing that the training is to cast the pointers to the core.
3-pointers is very particular about the feel, but the real feel almost culture rely on every day of shooting training for a professional athlete, one day without training is not shooting it means their own hands feeling down and have to pay more days to make up for the day the vacancy, for the amateur, three-pointers every day training, then the best, but there are no conditions to have a lot to practice, to ensure the training times, especially specifically the time to practice. Do not mix, and other specialized practice this technology. If the conditions allow, the best continuous shooting many times (like NBA third of Competition) as most beneficial to the dynamic stereotype.
4, the time of the game to have the awareness to look for the opportunity to shoot threes, in particular, and teammates, outlined thirds vote tactics used to improve the capacity of their actual tactical.