LED driver selection: HV LED VS DC LED

The current mainstream LED lighting applications, with a DC driven LED (DC) for the large, in fact the application environment of the terminal user observation, lighting more than 9 is to connect the power (AC) AC drive light emitting lamp, use DC LED AC/DC to convert the energy required by the potential to drive the lighting of lamps, the lamp not only increase the application of the cost, increase the complexity of products, energy conversion efficiency will also affect the overall energy efficiency, HV LED demand and benefit has been paid more and more attention...

At present, the use of LED lighting is most widely used, most are still based on DC LED, but LED think in light output enhancement, which must increase the driving power and increase the bias, while DC LED in drive voltage and current to a certain extent limit, resulting in power first through the AC-DC circuit to convert DC LED required the driving voltage, can drive LED light source for lighting purposes. Also because of the DC-LED drive voltage is small, the market will have a certain degree of loss of power conversion, energy conversion efficiency will be low, resulting in a significant impact on the overall use of lighting. In particular, is required for DC-LED to AC-DC conversion circuit or rectifier, will make the lamp or additional material cost to replace the LED bulb, panel lights and other lighting products, at the same time in order to lower the lighting costs can only use the low cost AC-DC conversion circuit, which makes for the key problem of low conversion efficiency of light conversion AC-DC circuit.

Pictured can support 50 volts, 60mA driver HV LED, HV LED can simplify the drive circuit design, so that the lamp life longer.

The influence of power supply design on LED lighting application

To limit the use of improved DC LED, the industry is also in the development of high voltage LED products, these products even in the end to electricity (AC) direct drive, lighting source less AC-DC conversion circuit, the driving circuit is equal to the cost of materials, but also because of AC, direct drive, energy the conversion efficiency can be greatly improved, the luminous efficiency of part design differences, compared with the same power products generally have better luminescence efficiency.

To examine the traditional lighting use situation, in the traditional lighting design, light emitting efficiency with fluorescent lamp - light energy conversion efficiency is highest, fluorescent lamp has at least 60 ~ 70 lm/W expression level, but the fluorescent lamp driving circuit such as electronic ballast, driving voltage conversion circuit will produce about 15 ~ 20% the energy conversion loss, and the lamp light scattering light for the week, the light output of the lamp on the edge of the lamp reflector which needs light refraction, the efficiency loss will have about 40% loss, check the overall light use situation observation, the luminous efficiency of fluorescent lamp lamp only about up to 30 ~ 35 lm/W level.

[1] [2] next page