1. Field of the Invention
The present invention relates to a control circuit, and more particularly, to an LED control circuit.
2. Description of Related Art
In recent years, Light Emitting Diode (LED) has been widely used in lighting application. Comparing to traditional fluorescent tube, LED tube conserves more energy and is in smaller size. Accordingly, the use of LED can save cost and space. Currently, the power for lighting an LED is provided by a power source; however, if over power flows through the LED lamps, the life of the LED lamps is reduced easily.
A typical fluorescent control circuit of prior art is presented in FIG. 1. The circuit creates a high AC voltage to ignite a fluorescent lamp, and then a AC current flows through the fluorescent tube, and a regulation circuit will regulate the AC current to maintain the desired luminous. But the LEDs transfer electricity into light by using different method, the LED lamps usually need less power to have similar luminous compared to the fluorescent lamps. In other words, typical blaster delivers more power than LED lamps need. The life cycle of LED will be shorten if LED consumes power higher than its rating.
Therefore, there is a need to provide an improved LED control circuit that can help LED tubes to work with all variable light fixtures directly and help the blasters to regulate LED currents without further modifications.