the company in the semiconductor and hard disk (hdd) used aluminum die-casting impressive performance heat sink area. aluminium adc12 die-casting heat sink materials such as commonly used, but die casting alloys "ht-1" (manufactured by large aluminum indusy record). although the ht-1 less than the casting of adc12, but comba used in the semiconductor and hard drive heat sink, etc. have accumulated rich experience, so in the use of ht-1 were casting no problem. however, the heat sink very deep, so the manufacturing mold wire edm cutting wire bending made great efforts.with the energy saving, environmental protection, light, high-quality image quality requirements.
banner sign led requires a valid driver circuit. the driver must rely on imprecise stable power supply rails, but must also be cost-effective and space efficiency. in order to maintain a long working life, we must first ensure that no more than led current and temperature limits. no matter what changes the input voltage, led driver is able to provide constant current led sing to maintain constant light output and color, so usually a constant frequency, current mode led driver topologies. compared with voltage mode conol, current mode conol improves loop dynamics and provides by-cycle current limit, which provides a constant current to the led. finally, led driver must provide more than 90% efficiency, to minimize the need for external cooling measures, and maintain the high efficiency lighting systems. figure 1 shows the led driver ic using a single 50w.
neon light signlead in lead glass ingredients are added by the red lead or lead silicate inoduced, red lead dust, glass melting process of smoke emissions on the environment of lead pollution. elecic light source products abandoned after use, if free, the lead oxide in glass would be replaced gradually precipitated and pollute the environment. elecic light source products also contain harmful substances arsenic, mainly glass melting process using arsenic ioxide as a clarifying agent into the. the final residue of arsenic in the glass content is generally .
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