High-power LED surface light source

Abstract

The invention discloses a high-power LED surface light source. A high-power LED light source with high color rendering and low color temperature is manufactured by mixing the light of white LEDs and the light of red LEDs into white light according to a certain ratio; a single white LED is coated with fluorescent powder; LED chips are fixed in respective independent metal grooves; the bottom and the lateral surface of the grooves are respectively provided with a layer of highly reflective membrane; a red LED groove is arranged in the middle of a white LED groove; the interval between the grooves is not more than 2 mm; a single groove can be provided with a lens or the grooves can be integrally covered by the lens; and different light effects are obtained by mixing the light of the white LEDs and the light of red LEDs according to different ratios. Under the condition of the same color temperature, the high-power LED surface light source has high luminous efficiency and good color rendering index compared with like products; the LED chips are welded with a soft circuit board on a substrate by a gold wire or a copper wire to reduce the impact on the chips in the welding process and improve the service life of the chips; the soft circuit board is directly attached on the substrate; the white LEDs and the red LEDs are provided with power in a shunting way; and the current can be adjusted.

Description

technical field [0001] The invention relates to a novel light source, in particular to a high-power LED surface light source. Background technique [0002] As a new type of semiconductor light source, LED has great advantages in energy saving, environmental protection and long life: energy consumption is 10% of incandescent lamps, 50% of fluorescent lamps; solid packaging, firm structure, life of 100,000 hours; environmental protection On the one hand, replacing incandescent or fluorescent lamps with LEDs does not require the use of glass vacuum packaging, and there is no pollution of poisonous gas and mercury. The luminous efficiency of high-power LED white light mass-produced in China is generally 80-90Lm / W. There are also LEDs with higher luminous efficiency in the laboratory, and the efficiency can reach 90-100Lm / W. Unable to mass produce. In terms of LED light decay, within 5000 hours, it is generally maintained within about 5%. There are also LED light decays produce...

AI Technical Summary

Problems solved by technology

[0003] 1. The color rendering index is low, the spectrum is discontinuous, and the light color displayed under LED illumination is not as true as that of incandescent lamps;

[0004] 2. The "spot" is generated, and the "yellow circle" problem is easily caused due to the matching error of the white light LED's own manufacturing process defects and lenses;

[0005] 3. The luminous efficiency is low, and the luminous efficiency of commercialized high-power LEDs above 3W is lower than that of high-intensity gas discharge lamps with a luminous efficiency of 100lm / W or higher, and is also lower than that of rare earth tricolor fluorescent lamps with a luminous efficiency of 60lm / W or higher

[0006] 4. The problem of thermal effect is not easy to solve. 75% of the electricity flowing into the LED chip will produce thermal effect, and only 25% will be converted into light. That is to say, as the power increases, the LED chip will generate higher heat, and it is difficult to manufacture more than 6W. At present, most of the high-power LEDs in the market are mainly low-power LEDs, which is not conducive to the development and development of the LED lighting market.

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