The LED general lighting market has hanged everyone's appetite today, attracting so many people's attention, the reasons are nothing more than the following three aspects, first, its market is large enough; second, the end of this year or early next year, LED universal The first year of the lighting market will come, that is, LED lighting will account for more than 10% of the total lighting fixtures; third, the market for incandescent, fluorescent and energy-saving lamps is basically supplied by GE, Philips and OSRAM. Different commercial monopolies, today's LED lighting manufacturers produce only about 10% of the total lighting market, that is, the LED general lighting market is not a monopoly market, everyone has a chance to play inside.
However, most LED chip suppliers today are at risk of being out of the market because the low-voltage LED chips they produce today will become increasingly difficult to sell into the LED general lighting market. why? Because high-voltage LEDs appear, high-voltage LEDs have two distinct competitive advantages over low-voltage LEDs:
First, at the same output power, the drive current required for the high voltage LED is much lower than that of the low voltage LED. For example, the high-voltage blue 1WLED of the crystal photoelectric photoelectricity has a forward voltage drop of up to 50V, that is, it can output 1W power with only 20mA driving current, and a normal forward voltage drop of 3V 1W LED requires 350mA driving current. In order to output 1W power, the high-voltage LED with the same output power dissipates much less power than the low-voltage LED during operation, which means that the cost of the heat-dissipating aluminum casing can be greatly reduced.
Second, high voltage LEDs can significantly reduce AC-DC conversion efficiency losses. Taking 10W output power as an example, if a 1W high-voltage LED with a forward voltage drop of 50V is used, the output can be configured in 2 and 4 strings, and the forward voltage drop of 4 series LEDs is 200V, which means only from the city. Electric 220V AC (AC) can be bridged and reduced by 20V. But if we use a 1W low-voltage LED with a forward voltage drop of 3V, even 10 strings with a forward voltage drop is only 30V, which means that it needs to be stepped down from 220VAC to 30VDC. We know that the lower the input and output voltage difference, the higher the conversion efficiency of AC to DC. It can be seen that if high voltage LED is used, the efficiency of the transformer can be greatly improved, which can greatly reduce the power loss during AC-DC conversion. A reduced heat consumption can further reduce the cost of the heat sink.
Therefore, if high-voltage LEDs are used to develop LED general-purpose lighting products, the overall power consumption can be greatly reduced, thereby greatly reducing the design requirements for the heat-dissipating casing. For example, we can meet the heat-dissipating requirements of LED lamps with a thinner and lighter aluminum casing. Since the cost of the heat-dissipating aluminum casing is one of the main cost components of the LED lighting fixture, the effective reduction of the cost of the aluminum casing also means an effective reduction in the cost of the overall LED lighting fixture.
It can be seen that the high-voltage LED can bring about an effective reduction in the cost and weight of the LED lighting fixture, but its more important significance is to greatly reduce the design requirements for the heat dissipation system, thereby effectively clearing the maximum entry of the LED lighting fixture into the indoor lighting market. Technical barriers. Therefore, high-voltage LEDs will dominate the future LED general lighting market.
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