a diy led diagram/plan

[rolandgelo]

uy sali ako dito sa project na to ..I can bring in LEDs from the US and China, yung mga benta sa ebay

[thurrmac]

question, pwede rin bang mag diy ng drivers?

[obet_carlos]

if you have a background in electronics.. preferably power electronics.. maraming iba ibang pwede drivers..

[khelz]

[thurrmac]

@ obet
ty bro

@khelz
galing ng link mo... ty

[obet_carlos]

that is for super bright LEDs.. not power LEDs.. for 1W LEDs you need around 320-350mA and for the 3W LEDs you need around 700-750mA.. two kind of drivers ang naisip ko, 1 yung parang buck puck.. well essentially its a buck puck nga.. from a certain DC level, lets say 32V, it will regulate the current of the LEDs to what is needed.. yung 1 yung diretso from the meralco outlet.. 220V input output mo is a constant current supply to a series of LEDs..

[thurrmac]

[khelz]

@sir obet: bkit po nka series ung led.. indi nka parallel? in series connect pagbusted isang light mu patay din ung ibang lights.. then you need to troubleshoot which light is busted.. unlike in parallel connection makikita agad ung busted light.

info:
In series connection there is voltage drop per load/lights but the current will still be equal.
In parallel connection there is current drop per load/lights but the voltage will still be equal.

[kentpoy23]

game ako dito... sana pati price malaman ko... hehehe... para makapag ipon para dito...

[thurrmac]

[kentpoy23]

same tayo ng problem sir... hehehe, naawa tuloy ako sa tank ko, insufficient yung light... sana mura lang mga to...

[obet_carlos]

bro kasi yung LED dapat maregulate mo yung current.. yung output brightness niya is proportional sa current.. para mamaximize mo yun LED dapat mabigay mo yung tamang operating current niya.. 700mA for the 3W.. kaya yung mga drivers, usually nakaseries, para 1 lang yung current passing thru them.. too much current, masisira in time yung LEDs.. too little, hindi mo makukuha yung optimum output niya, although may output din..

kung tingnan mo sa mga datasheet ng LEDs, yung voltage drop nila at a given operating current is not the same.. range ang bibigay.. lets say na 3W na LED, yun voltage drop nito, typical is yung 3.5 V pero pwedeng umabot ng 3.9V or 3.2V.. so kung nakaparallel lahat ng LEDs mo, hindi parepareho yung current nila.. plus kailangan mo pa ng biasing resistor each parallel LED para malimit yung current, which is lossy..

pwede naman din nakaparallel pero we are aiming for efficiency, eto naman yung reason kung bakit tayo nagleds diba? kaya gumagamit tayo ng switching power supply (eg. buckpuck (stepdown converter), laptop charger, cellphone charger, etc.).. pulse width modulation din yung gamit dito.. pero may feedback network para naadjust niya yung on-time nung transistor..

if your worried about the power LEDs getting busted, bihira lang mangyari yun compared sa superbright.. yung cree ko nga, na patakbo ko ng 1.3A ok pa din for a few minutes.. although uminit at medyo humina.. i used a lux meter, d pansin sa mata lang.. pero pati china LEDs matibay naman..

now the key is to find how many LEDs in series and how many drivers in parallel.. parang yung nasa first page ng diagram..

[Sea Turtle]

[kentpoy23]

[thurrmac]