Currently my group is working on how to use a 3.7v Lithium-ion polymer battery to power many led's simultaneously.
We use arduino with pwm outputs to control which circuit to activate.
(Total 5 circuits, one active at a time)
Circuit 1. 40 red leds ( 10 in series and 4 parallel)
Circuit 2. 20 yellow leds (10 in series and 2 parallel)
Circuit 3. 30 orange leds (10 in series and 3 parallel)
Circuit 4. 20 red leds (10 in series and 2 parallel)
Circuit 5. 20 green leds (10 in series and 2 parallel)
See attachment for boost converter design.
The question is how to make the Vout range from 18.3volt to 21.3 volt, and Iout range from 40mA to 80mA?
Since connection 40 red reds( 10 in series and 4 parallel) requires 18.3 volt and 80mA.
Connection 20 green leds(10 in series and 2 parallel) requires 21.3volt and 40mA.
The arduino is pwm outputting at a freqency of 100kHz, to the transistor base.
What should the value of the inductor(L1), Capactior(C1) and R2 be?
Is the 3.7v Lithium-ion polymer voltage stable?
Should I consider other battery types?
We use arduino with pwm outputs to control which circuit to activate.
(Total 5 circuits, one active at a time)
Circuit 1. 40 red leds ( 10 in series and 4 parallel)
Circuit 2. 20 yellow leds (10 in series and 2 parallel)
Circuit 3. 30 orange leds (10 in series and 3 parallel)
Circuit 4. 20 red leds (10 in series and 2 parallel)
Circuit 5. 20 green leds (10 in series and 2 parallel)
See attachment for boost converter design.
The question is how to make the Vout range from 18.3volt to 21.3 volt, and Iout range from 40mA to 80mA?
Since connection 40 red reds( 10 in series and 4 parallel) requires 18.3 volt and 80mA.
Connection 20 green leds(10 in series and 2 parallel) requires 21.3volt and 40mA.
The arduino is pwm outputting at a freqency of 100kHz, to the transistor base.
What should the value of the inductor(L1), Capactior(C1) and R2 be?
Is the 3.7v Lithium-ion polymer voltage stable?
Should I consider other battery types?
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