Analysis of low power application management technology for controlling LED lighting

In order to obtain good brightness in Yun use low power supply, power consumption must be effective management of each LED. This requires a power management technology to achieve a given time only for a set of LED power supply. It is also necessary to manage the time interval to achieve the required luminous intensity, and it is not visually apparent that each group of LED is alternately lit.

When a group of LED is used to realize the lighting application, the relationship between the brightness of the LED and the electric power is the key technology to determine the quality of the visible light. In low power applications, because the current source is limited, in order to achieve the set of LED light brightness may not achieve the greatest. In order to obtain good brightness in Yun use low power supply, power consumption must be effective management of each LED.

Analysis of low power application management technology for controlling LED lighting

This requires a power management technology to achieve a given time only for a set of LED power supply. It is also necessary to manage the time interval to achieve the required luminous intensity, and it is not visually apparent that each group of LED is alternately lit. To determine the amount of LED that is lit during a given interval, the available power and luminous intensity must be determined. You must look closely at the relationship between the luminous intensity and the forward current characteristics of the LED data sheet to select the LED to meet the desired brightness level.

The application in order to achieve the required brightness level and the number of LED required, the ratio can be calculated the total current required for LED and the available current through the following ways, to determine the number of LED power supply in a given time interval:

A set of LED =LED is required for the total current / available power supply current

In addition, the frequency of a set of LED must be adjusted to light / extinguish.

Lighting time should be sufficient to make a group of LED all lit, the time is limited by the time of the group of LED before the start of a significant dark time. The blanking time limits the number of other LED groups that can be controlled when a group of LED is in the out state. Therefore, the blanking time limits the number of LED groups that can be managed by interval. The low cost implementation of this technique requires a clock source, a digital monostable trigger for controlling a plurality of groups of LED, and a gate or gate that can be detected by a simple On/Off switch.