Price barriers continue to break through the LED lighting product recognition has increased year by year

Light emitting diode (LED) is used for the next generation of lighting components of buildings and indoor lighting, light emitting efficiency than incandescent lamp is much higher, however, it must take special electronic driving circuit, make sure not to suffer too much stress, so that they continue to provide that product specifications in long life. In this paper, we will discuss how to use the simple LED driver circuit to provide the necessary reliability and minimize the cost of the lamp.

LED features more efficient interior lighting design

The characteristics of LED lighting has been the designer of indoor lighting can further design a new lighting scheme, for example, LED small size, and can be arranged densely, be placed in the soft light, or easy to hide in the cupboard and stairs, a more flexible design. In addition, the main working parameters of the LED is relatively simple, as long as the current is kept constant, and is lower than the maximum current affordable, further work in the design parameter range and would not suffer too much stress, LED service life is one hundred times longer than incandescent bulbs, become another key advantage. Therefore, if the drive circuit conforms to the LED specification, the output of the light source can be kept constant, and the service life can be more than 50 thousand hours.

On the other hand, the design principles of building and interior lighting shall be in accordance with the global norm, and the luminaire shall be operated within 50 or 265VAC of the full range of voltage specifications in the range of 85 to 60Hz. The design of the power supply circuit, which covers the general voltage requirements, has been completed and is expected to be further developed in the future. It must be noted that these power supply design for the end product optimization, but not necessarily the best solution for the LED drive circuit.

Reduce the design burden to maintain the current constant rise of the program

Due to the traditional power supply to provide accurate voltage output and different current levels, it will be a resistor and LED serial, can limit the current. The prerequisite for such a design is a clear understanding of the LED (string) at both ends of the voltage, and this voltage does not change with the LED temperature changes. But the disadvantage is that the LED forward voltage usually varies with temperature, so the LED manufacturer must according to the components for encoding forward voltage, the lamp manufacturers can construct lighting design matching and LED forward voltage at a fixed temperature.

Under the consideration of this design, the circuit that does not have to pass the LED code is more attractive, because it can save the time of the LED manufacturer, and the price of the LED will be cheaper. Not only that, due to security problems, LED forward voltage also has a negative temperature coefficient (i.e. temperature when the forward voltage drop), may lead to overheating and out of control circuit, it must require designers to build protective circuit, and an additional cost.

Therefore, the best scheme of the LED drive circuit is to monitor the current and keep the current constant. This kind of circuit is not affected by the forward voltage of LED, without LED coding, and eliminates the influence of LED on the negative temperature coefficient of forward voltage. With this kind of circuit is widely used, can be a complex switching regulator or linear regulator with a feedback loop, and the switching regulator is very suitable for complex applications such as high light output, luminous efficiency main street lighting.

Thus, are suitable for buildings and indoor lighting with simple, economic and robust hybrid circuit design, although its performance requirements may not complex switching regulator is high, but low cost and simple design architecture makes it an attractive choice.

Niu Huiping said, LED lighting products raw materials with high investment, high production costs, have caused a high price, and therefore can not be in the most valued people's price advantage to find a breakthrough, in this case, the important role of government subsidies to show out, now we have large factories, city tunnel and other high-end clients to develop products for the company's service object, product acceptance is increasing year by year.