LED solar lamp dimming choice of driving power supply applications

Application of LED in lighting lamps and lanterns is more and more widely, and is superior to the traditional way of lighting the uniqueness of, in addition to improving the quality of life, improve the light efficiency and extend the service life of lamps and lanterns, with its unique function of adjustable light the change of the light color temperature and brightness, and fully meet energy application for its greatest strengths. LED lighting lamps and lanterns of the adjustable light efficiency can be is depends on the collocation of LED light source and drive power supply. In general, the LED light source can be simply divided into two broad categories: LED diode light alone or with a resistance of LED diode light source, on application, sometimes LED light source is designed to contain DC - A DC converter module, as complex module is not in the scope of this article. If the LED light source module or as separate LED diodes itself, common dimming method to adjust the amplitude of input current in leds, so the selection of LED drive power supply should refer to this feature, Ming weft company HLG/characteristic of the family of ELG is current can be adjusted, and can be made of external 1 - VDC 10 * 10 VPWM pulse-width modulation or even only through an external a simple variable resistance to control the output current of the modulation. While another is equipped with a resistor LED diode light source ( Commonly referred to as article LED lights or LEDSTRIP) , article LED lights are widely used have LED diodes in series resistance, so the voltage is relatively stable, so users can access any sold the rated voltage of power supply to drive the leds. Common article LED lights are typically 12 VDC or 24 VDC driver, but also so in the article LED lights dimming applications can be a bit difficult. This paper illustrates the use current amplitude adjustable light way of the application of drive in the article LED lights, also discuss some common problems that move light, and introduced the output pulse width (at the same time 脉宽调制) Modulation adjustable light power LED drive, Ming weft companies have launched and recognition in national technical innovation product of series of the family of PWM, is currently on the market the most appropriate and most simple article LED lamp dimming solution. Common LED dimming adverse conditions: sounds that move light seems to be a simple thing to do, in fact, want to have good and smooth dimming performance is need to consider many factors, common LED dimming adverse situation has a lot of, the following table ( A) As shown in the table ( A) : a common problem that move light when using the output current is adjustable LED power driver for the LED lamp dimming, deadtravel is often happened. Although when LED drive power supply unit is in full load condition ( As figure 1 - a) Can work well is good, but when the LED driver is not in full, the light status is obviously not smooth. Figure 1: Ming weft LED drive HLG - In the different load (100 Length) Conditions in the article LED lights: ( a) Loaded with 100% - - Can produce the best performance that move light; ( b) 70% load - - - - - - - Shows the imperfect dimming effect; ( c) 30% load - - Dimming results showed poor, because the adjustable range of light is too narrow. The output pulse width modulation ( Output PWM) Solution if it is under the condition of full use of LED driver power supply for LED lamp dimming applications, that is no deadtravel issue. The above argument that's right, but not very practical. In fact, article LED lights are often in a variety of applications ( Decorative lighting/auxiliary lighting/advertising lighting) Length cannot be accurately estimated under the condition of use, so the application of the simplest and best solution is to should have the right to choose which has the function of the output pulse width of the PWM dimming LED drive power to realize the article LED lamp dimming demand. While the output brightness with dimming signal load cycle to reduce the brightness of the light changes, choose the important parameters of drive power supply is dimming parsing and the frequency of the output pulse width modulation PWM, dimming ability should be as low as zero. 1% to 8 bit dimmer resolution to comply with all the article LED lamp dimming applications, the output pulse width modulation PWM frequency is should be able to raise as much as possible, in order to prevent the table ( A) Light flicker problem, according to the relevant technical research literature reports, frequency suggest at least more than 1. 25 KHZ, ghost visible to reduce human eyes flashing. Conclusion the best article LED lamp dimming solution is the use of the output pulse width modulation PWM dimming function, to solve the problem of common deadtravel dimmer. Ming weft company provided by the PWM model covers 40/60 90/120 w/four series, such as article is very suitable for all kinds of LED lamp dimming LED drive power supply applications.