Power management technology of low power LED lighting applications

When the control to implement a set of LED lighting applications, LED brightness and the relationship between the electric power is a key technical index in determining the quality of visible light. In low power applications, due to current source co. , LTD. , at the same time LED to light up a whole set of Yun brightness may not be possible. In order to get better Yun brightness when using low power sources, must be effective management of power consumption of each LED. This requires a power management technology, to achieve in a given period of time for a set of LED a group of power supply. To manage the time interval, in order to achieve the required luminous intensity, and on the vision not found between groups of the LED is lit alternately.

to determine whether a given time interval the number of the LED light must determine the application of the available power and luminous intensity. Must take a closer look at the LED luminous intensity in the data manual relations with forward current characteristics, to select the meet the required level of brightness of LED. Determine the application to achieve the required number of LED brightness level and need, can be calculated by the following way LED the total current and the current ratio are available, and to determine in a given time interval the number of the LED power supply

= the number of the LED a group of LED the total current/available power total current

in addition, must adjust a LED light/put out a set of frequencies. Light time should be enough to make a set of all leds light up, go out time is limited by the group LED before starting the obvious dark time. Extinguishing time limit when a group of leds are in a state of quench, applications can control the number of other LED group. Therefore, the extinguishing time limit by time interval management group, the number of LED.

the technology of low-cost implementation requires a clock source, is used to control the number of groups LED digital monostable trigger, and through a simple On/Off switch to detect start conditions or gate.

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