<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Hi River,</div><div id="AppleMailSignature">just a quick word on this.</div><div id="AppleMailSignature">I am getting 12 dc buck / boost constant current LED drivers with PWM dimming</div><div id="AppleMailSignature">control off a rotary switch potentiometer, made up for me in China.</div><div id="AppleMailSignature"> Max input voltage is I think 50V. & output is 38V with variable Amps up to 3 Amps. </div><div id="AppleMailSignature">Most Psubbers seem to have a 36V system & when fully charged that is well over 36V.</div><div id="AppleMailSignature">So I would revise the maximum input voltage. A lot of electric bikes also have 36V</div><div id="AppleMailSignature">systems with lithium iron batteries. That may be an application.</div><div id="AppleMailSignature">I went to a different LED that is smaller round but still a Verolux. Max of 80W.</div><div id="AppleMailSignature">Smaller is advantageous in lots of ways.</div><div id="AppleMailSignature">You can email me on <a href="mailto:alanlindsayjames@yahoo.com">alanlindsayjames@yahoo.com</a> if you want to discuss anything</div><div id="AppleMailSignature">privately.</div><div id="AppleMailSignature">Alan</div><div id="AppleMailSignature"><br></div><div id="AppleMailSignature"><br></div><div id="AppleMailSignature"><br>Sent from my iPad</div><div><br>On 22/04/2017, at 5:03 PM, River Dolfi via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><div dir="ltr"><div><div>Hey everyone,<br></div>I've managed to convince a professor at
the University to let me tackle developing a high power LED driver for
psubs purposes for a grade. I'm just curious which features everyone
would like in an LED driver. I am designing a driver for the Bridgelux
Vero 29 LED array and will hopefully package it into a form factor so
that all of the electronics fit into the enclosures Cliff designed and
presented at the last convention. <br><br>So far I plan on using a small
microcontroller (probably an ATTiny for those who are interested) to
generate a PWM signal that will switch a MOSFET, to control the amount
of power delivered from an off the shelf constant current LED driver
chip. The chip I found, the LT3478, seems to be ideal for PSUBS
purposes, as it contains it's own converter that will accepts anything
between 5 and 36 volts. <br><br>I'm also probably going to incorporate a
temperature sensor that will shut the light down if it gets too hot
(running the light for too long out of the water) and killing the
electronics/melting the lens. The microcontroller will accept a 0-5 volt
analog signal from either a potentiometer or a PLC in order to convert
that to a PWM signall to dim the lights.<br><br></div>Are there any
major features that I'm missing? It seems that PWM dimming and
application specific temperature control are the big ones. Curious to
get input from those that are running LED rigs right now.<br clear="all"><br>-- <br><div class="gmail_signature"><div dir="ltr">-River J. Dolfi<div><br><div>412-997-2526</div><div><a href="mailto:rdolfi7@gmail.com" target="_blank">rdolfi7@gmail.com</a></div><div><a href="mailto:rwd5301@psu.edu" target="_blank">rwd5301@psu.edu</a></div></div></div></div>
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