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Pulse drive circuit

2015-01-03 09:32  
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Pulse drive circuit
Figure shows the current waveform by pulse drive. The peak pulse drive current is about 4 times of the average current. The frequency is 100Hz and the duty cycle is 10%. This drive method has following advantages. As LED does not work most of the time in a cycle (90% of the cycle), the LED's heat is not necessary to be considered. Together with the reduction of the heat, LED’s light failure can be greatly reduced, thus extending the life of the LED. Therefore, the pulse-driven approach can be considered to be the most practical way for LED.