The light-emitting diode (LED) is used for building the next generation of lighting and interior lighting components, light-emitting energy efficiency incandescent lamp is much higher, however, must be dedicated electronic driver circuit to ensure not to be subjected to excessive stress, so that they continued provide long-life claims in the product specifications. The premise for this technology, this paper will explore how to use a simple LED driver circuit to provide the necessary reliability, and lighting costs to a minimum.
led 1w characteristics blessing interior lighting design more efficient
Characteristics of the LED lighting interior lighting design can be further designed a new lighting scheme, for example, small size, LED, and can be densely packed so that it can placed in the soft light, easy to hide in the cupboard and stairs reached more design flexibility. In addition, the main operating parameters of the led power 10w is relatively simple, just keep the current constant, and below can withstand the maximum current, further work within the parameters of design without suffering too much stress, LED service life than incandescent bulbs, a hundred times longer to become Another key advantage. Therefore, if the drive circuit the LED specifications, and its light output will remain constant, and basically the useful life of more than 50,000 hours.
On the other hand, buildings and interior lighting design guidelines are required for universal norms, the lamps shall be 50 or 60Hz frequency in the complete universal voltage specifications within 85 ~ 265VAC. Covered by the requirements of this universal voltage power supply circuit to complete the design, production which is expected this design based on further penetration of computer and mobile phone markets. It should be noted that, to optimize power supply design for the end product, but not necessarily the best solution of the led power 50w circuit.
Reduce the design burden to maintain a constant current program rise
Traditional power to provide precise voltage output and current levels, so a resistor and LED serial, you can limit the current. This kind of design is clearly a prerequisite for the voltage across the LEDs (string), and this voltage will not follow the led 10w temperature change. But the downside is that the LED forward voltage is usually with the temperature, LED manufacturers shall be encoded according to the forward voltage of its components, lighting manufacturers can build to match with the LED forward voltage at a fixed temperature lighting design.
Consider under this design, not subject to the LED circuit encoded with more attractive because it can save the time of the LED manufacturers, and the production of the LED prices will be cheaper. Moreover, due to security issues, the LED forward voltage with negative temperature coefficient (ie, the temperature rises, the forward voltage drop), may cause the circuit to overheat out of control, it also requires the designer to build a protection circuit, is a document the additional cost。
Therefore, the best solution of the High Power LED 50W circuit can monitor current programs and to keep current constant. Such circuits from the LED forward voltage, without LED coding, and removal of the LED in the negative temperature coefficient of forward voltage. Coupled with the extensive application of such circuits, can be complex switching regulator with a feedback loop linear regulator, the complexity of the switching regulator is very suitable for high light output applications, such as luminous efficacy-based street lighting .
Thus, building and interior lighting are suitable for using a simple, economic and robust hybrid circuit design, although its performance may be high, unlike the complex switching regulator, low-cost and simple design architecture to make it to be a very attractive option