packaging should be anti-static shielding bags, it is used the device packaging, ansport and storage, has a moisture-proof effect.typical cv characteristics of led light curve shown in figure 1, led's normal work area is the figure vf (0) --- vf section. work can be seen from the paragraph, to make led's work stability, the most effective way is to use current methods to conol their work to achieve a stable operating point led, so the led modules for a single sing, using current source driving or achieved by adjusting the operating current to the most reliable dimming is the preferred method. however, if the constant pressure circuit, and then applied or the use of led modules in the constant current circuit, but also to achieve the purpose of the led stability, this time, constant voltage circuit and re-applied or the use of led modules should be integrated in the constant current circuit together as a led conol device.
vinyl signs we observed a 10-speed to improve the thermal conductivity (heat afer coefficient); and in these nano-suctured surface energy is also measured to 4 speed improve the critical heat flux (critical heat flux). "pacific northwest national laboratory, said the ad hoc host terry hendricks; he is happy with the ausalian high state university professor chih-hung chang conducted the study with. the kinds of nano-coating method called "micro-nano-materials assisted deposition reactor (microreactor aisted nanomaterial deposition, mand), is a zinc oxide particles deposited on aluminum and copper subsates; with nano suctured paint blessing, to become more efficient heat ansfer.
led scrolling sign framework of the main advantages are obvious. output capacitor is usually provided by the load power. supply current is very low, only occasionally by the output capacitor charge pump to recharge. in short, the voltage charge pump in a wide input range can not maintain high efficiency, because the input - output current voltage conversion ratio according to the basic regulation, any more than the input voltage multiplied by the gain from the value of the charge pump output voltage lower will result in an additional power converter, and the efficiency will be reduced in proportion. converter according to the input / output ratio allows the ability to change the gain in the entire input voltage range of the best efficiency. ideally, the gain should be a linear-type changes. in reality, given the number of fixed capacitors and switches, may reach only a limited gain configuration. in figure 4, the input voltage is adjusted, and was fed to three comparators positive nodes.
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