From February 2010, Sharp and Toshiba Lighting Technologies began to supply LED bulbs that are close to the shape of a small E17 bulb (Figure 1). The E17 bulb market is expected to increase significantly (the Toshiba Lighting Technology Headquarters LED product technology department LED product technology principal and co-worker Sakai) products, it is expected that E17 LED bulbs will account for 40% of the domestic domestic bulb market in 2012 Left and right (Figure 2).
In order to open up this promising market, Sharp and Toshiba Lighting Technology will use small-scale technology to challenge this field. Both companies have achieved miniaturization of their products through newly developed power circuits and LED packages.
Sharp uses LED bulbs for display Figure 1: Proximity to the shape of the E17 bulb
Sharp and Toshiba Lighting Technologies launched an LED bulb close to the shape of the E17 bulb in February 2010. The power consumption, life and support lamps of the two companies are different. The picture of the LED bulb is provided by two companies.
Figure 2: The proportion of E17 bulbs continues to increase
Use Sharp's data based on various data. Since the second decimal place is rounded off, the total value is not 100%.
Sharp invests in AQUOS TV's power development team
Design and re-development first (Deputy Director of the LED Lighting Business Promotion Center and Director of Commodity Planning, Tao Jing Heng Hao, Sharp Health and Environmental Protection System Business Division). Sharp uses a design that is infinitely close to the E17 bulb.
In order to achieve miniaturization of the power supply circuit, the company invested in the power development team of the LCD TV AQUOS. When using the power circuit used in the original E26 LED bulb, the transformer and electrolytic capacitor are too large to be stored in the E17 bulb. As a result, AQUOS's power development team has dramatically improved the power circuit and changed the previous step-down chopping method to a flyback mode. In this way, while the transformer is greatly miniaturized, the electrolytic capacitor is successfully replaced with a small ceramic capacitor (Fig. 3).
However, in order to achieve miniaturization, electronic components having a higher price than the original price have to be used. In order to control the increase in cost, Sharp reduced the purchase price of electronic components by increasing the output of LED bulbs. The previous LED bulb production scale was 200,000 per month, and this time it has increased to 500,000 per month. This is because lighting is the same as digital home appliances in terms of using semiconductors and electronic components. Mass production can reduce costs (Taojing).
Another driver for miniaturization is the newly developed LED package, which houses 40 blue LED chips in a 12mm 15mm package. However, the original mm-square package is arranged with a plurality of blue LED chips, so a sufficient number of injections 1) cannot be disposed on the E17 type LED bulb.
Note 1) The characteristics of the newly developed package are not only achieved by miniaturization. In addition to pre-adjusting the color unevenness of the blue LED chip on the package, the aging of the product can be suppressed by using a ceramic substrate instead of the original resin substrate.
Sharp has started mass production of blue LED chips since the beginning of 2010 before supplying E17 LED bulbs. First of all, it is supplied to the company. It is estimated that some of the E17 LED bulbs are equipped with this blue LED chip.
Miniaturization with 4-layer backplane
Toshiba's lighting technology has replaced the printed circuit board of the power supply circuit with a four-layer base plate from the original two-sided base plate, and also replaced electronic components such as electrolytic capacitors with small components, thereby achieving miniaturization (Fig. 4). According to reports, this is the first time the company has adopted a 4-layer printed backplane on LED bulbs.
Figure 3: Miniaturization of transformers and capacitors
Sharp realizes the miniaturization of the transformer and replaces the capacitors so that the power supply circuit can be housed in the E17 type product (a, b). A new package (c) for high-density mounting of LED chips has also been developed.
Figure 4: Switch to a 4-layer backplane
Toshiba Lighting Technology reduced the floor area (a) by replacing the two-sided base plate with a four-layer base plate. A self-developed mounting device (b) was used to make the LED package. The picture shows the data of Toshiba Lighting Technology.
The cost increase caused by the use of a 4-layer printed backplane and miniaturization of electronic components is offset by reducing the manufacturing cost of other components. For example, a method of manufacturing a hemispherical resin lampshade called Glove has been changed, and the amount of resin added for heat dissipation has been minimized. Note 2)
Note 2) Originally, in order to uniformly irradiate light, a blow molding technique in which the thickness of the resin is uniform is employed. This time, the use of locally thicker injection molding technology reduces costs. Thicker parts can also be used in places where there is no light.
The LED package is miniaturized by mounting 56 blue LED chips in a single package. In order to equip LED chips with high density, the company independently developed a product assembly device. Blue LED chips are sourced from other companies.
Toshiba Lighting's E17 LED bulbs are characterized by support for sealed appliances (3). In this regard, Sharp's Tao Jing said that it is difficult to verify various appliances because no lighting fixtures have been produced, so Sharp does not support sealed appliances. (Reporter: Hehe Jishen)
Note 3) In addition, the brightness (light flux) of the 1W power consumption of the LED bulb of Toshiba Lighting Technology is as high as 85.3 lm/W (昼 white product). In order to support the dimmer, Sharp's products consume slightly more power.
36V Ebike Battery,36V Ebike Battery Series,Bottle E-Bike Battery Pack,Electric Bicycle Lithium Lon Battery
ZHEJIANG TIANHONG LITHIUM-ION BATTERY CO.,LTD , http://www.tflbattery.com