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| The circuit analysis for 1 W high-power LED driver |
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High-power LED lamp has a higher efficiency and service life than the luminous. People should use the another installation of the radiator according to the actual radiator. In view of the working voltage of high-power LED is only 3V, through the whole bridge rectifier let AC 220V changed into DC, in all the bridge of the voltage drop to about 1.8 V, only drive a light emitting diode electricity use efficiency is only 60%. In order to make the total energy utilization efficiency over 80%, it must be more than 3 LED light in series to work.
The practical driver for 1w high-power utility as shown in figure, including: the C3 capacitance main effect is to prevent the large current through LED to cause damaged when connected to 220 V, VS1 open load is to prevent when the load opend the C3 two ends cause heat generated and make high pressure serious explosion. VDS1 trigger the turning point of the diode is 30 V ~ 40 V, normal conditions, on both ends of the C3 not exceed 10 V, VDS1always deadlines, VS1 also has been concluded. Only in load circuit broken or LED internal opened, C3 ends up to 30 V~ 40 V, VS1 just immediately conduction and maintain on-state. Troubleshooting, re-power, VS1 automatically restore the state deadline. With the B received DC positive end alone, will make VT8 conduction, VT5 and VT2 deadlines, then LED2 light working. Will C end received DC end alone,it will makes VT9 conduction, VT6 and VT3 deadlines, then LED3 work lighting. At the same time, the B or C received DC positive end,it can makes VT4 conduction, VT1 then conductivity, LED1 was doesn't work for VT1 short circuit. But it will A end receiving DC positive end, it will makes VT7 conduction,BG4 was forced deadlines, then VT1 deadlines, LED1 light working. So, no matter what is the state of A, B, C three end, it always at least a glowing tube work. And through the increase in A, B, C three-terminal on the level control, you can make 3 a combination of light-emitting light according the need. A, B and C three end of level can use common switch to control, also can use only 3 D flip-flop and a pressing buttons to achieve cycle transform. Of course it also can use 6 series LED in series to work, with special lights control IC to realize dynamic change. |
