1,Figure 1 is for capacitance ballast circuit.The C1 Values determine the size of the working current .Working current normally is 12mA-15mA,and Within this scope LED is safe.We can cancel R2,C3 according to the situation .
2, Figure 2 is for the constant current source circuit.The R3 Values determine the size of the working current .When it is 30Ω,the Working current is 12mA.The VT1 voltage at the ends of the collector and emitter=the voltage for the two ends of C2 -The LED pressure drop*N .More the quantity of LED the is , lower VT need resistance to pressure and power.When the quantity of LED the is more ,We can use MJ13001 for VT1.
3, If the quantity of LED the is less ,We can use Figure 1 circuit .While the quantity of LED the is more ,We can use Figure 2 circuit .In terms of cost performance, Figure 2 circuit is the first selection.
4, The quantity of LED the is more ,the higher the energy utilization efficiency is .For example,Working current normally is 15mA(This value not only can make sure the brightness ,but also make sure the LED security)However the quantity is 1 or 90,Electric current is equal because led is In series .The power of the circuit P=220V*1.414*0.015A=4.67W.If 10 LED is used,and the pressure drop is 3.1V,then the power is 10%.While the rest is lost on the ballast or constant current source .But if 90LED is used,then the power will up to 90% .So it’s better to use more LED ,which can increase brightness In proportion,reduce the financial burden on the power part and Increase the reliability.
5, Leds classified two types :concentrated and astigmatism .For the concentrated type,Brightness is concentrated , range is far but it has a halo,which is applicable to the emergency light, flashlight, etc.While for astigmatism type ,Brightness is Scattered and soft,but it own a shorter distance,which is suitable for indoor lighting, desk lamp, etc. (can be mixed with a certain amount of concentrating)
6, There is a trick to choose LED:The bigger Light emitting chip ( visible phosphors in the LED)is ,the brighter the light will be .
2, Figure 2 is for the constant current source circuit.The R3 Values determine the size of the working current .When it is 30Ω,the Working current is 12mA.The VT1 voltage at the ends of the collector and emitter=the voltage for the two ends of C2 -The LED pressure drop*N .More the quantity of LED the is , lower VT need resistance to pressure and power.When the quantity of LED the is more ,We can use MJ13001 for VT1.
3, If the quantity of LED the is less ,We can use Figure 1 circuit .While the quantity of LED the is more ,We can use Figure 2 circuit .In terms of cost performance, Figure 2 circuit is the first selection.
4, The quantity of LED the is more ,the higher the energy utilization efficiency is .For example,Working current normally is 15mA(This value not only can make sure the brightness ,but also make sure the LED security)However the quantity is 1 or 90,Electric current is equal because led is In series .The power of the circuit P=220V*1.414*0.015A=4.67W.If 10 LED is used,and the pressure drop is 3.1V,then the power is 10%.While the rest is lost on the ballast or constant current source .But if 90LED is used,then the power will up to 90% .So it’s better to use more LED ,which can increase brightness In proportion,reduce the financial burden on the power part and Increase the reliability.
5, Leds classified two types :concentrated and astigmatism .For the concentrated type,Brightness is concentrated , range is far but it has a halo,which is applicable to the emergency light, flashlight, etc.While for astigmatism type ,Brightness is Scattered and soft,but it own a shorter distance,which is suitable for indoor lighting, desk lamp, etc. (can be mixed with a certain amount of concentrating)
6, There is a trick to choose LED:The bigger Light emitting chip ( visible phosphors in the LED)is ,the brighter the light will be .
没有评论:
发表评论