Laser pointer discussion. Read/write reviews of laser pointers and laser pointer companies. Learn about all types of laser pointers and lasers





Welcome to Laser Pointer Forums! If you are looking for a laser pointer or want to compare different laser pointer companies, you may want to check out the LPF Laser Pointer Company Database. The link will open in a new window for your convenience.








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes
Laser Technology Laser Pointer Parts Lasers by Wavelength
Top 10 Laser Pointer Companies Laser Pointer Company Database Visible Beam Laser Pointers


One laser store meets all your needs

























Go Back   Laser Pointer Forums - Discuss Laser Pointers > Lasers > Drivers, Test-load, Power Supply, & Batteries



LPF List of Laser Pointer Companies (link opens new window)



Reply
 
LinkBack Thread Tools Display Modes
Old 08-26-2012, 10:06 PM #1
Junior Member
 
Join Date: Aug 2012
Location: London, UK
Posts: 1
Rep Power: 0
Buriedcode is on a distinguished road
Buriedcode Buriedcode is offline
Junior Member
 
Join Date: Aug 2012
Location: London, UK
Posts: 1
Rep Power: 0
Buriedcode is on a distinguished road
Default Circuit protection for UV diode

Hi,

First post here so please be gentle. I've read the sticky's and searched the forum, got some great info but can't find anything specific.

I have a PHR-805 diode, 405nm, in a TO18 package. Along with a 'Aixiz' module housing, which came my first UV laser that has long since departed (over current, ESD who knows). Originally it just had two wires coming form it, directly soldered to the laser diode - not ideal.

So, whilst replacing the diode with the PSR, I thought about putting in a small circuit board in there, with some form of protection circuit. I realise there are driver circuits available that can fit, but for the sake of versatility, I wish to be able to plug this laser in to one of my own drivers - be they buck, boost, battery, or DC driven.

However, given how fragile these are (killed two already!), I need a small circuit that'll do a fair job of protecting the diode whilst its not plugged into anything - but not a driver circuit per se. As well as ESD, on the off chance I get over-zealous with drive current, perhaps some kind of small basic current limiter would be good as well. The threshold of which doesn't need to be 'dead on' accurate, but I could set it below the 120mA max. rated for these diodes.

I'm thinking, in parallel with the diode terminals, a TVS diode, reverse shottky for reverse polarity protection (the TVS wil do that as well..), a small ceramic cap, and a small active circuit that perhaps should shunt the diodes terminals in case of over current and/or over voltage. Should the shunt circuit 'blow' because of over current, it should short circuit the lasers terminals. Not ideal, but its easier/cheaper to replace a transistor than it is to replace the laser.

Of course, the 'active circuit' is kind of optional, nothing is easier than a small but of stripboard, with devices in parallel with the diode, and perhaps a series diode for good measure.

As you can see, because it won't always be directly soldered to a driver circuit, its a bit different. As you guys seem to know much more about laser diodes than I do, thought I'd come here to ask advice.

Btw, I do electornics, and can deal with buck/boost, constant current power supplies, and analogue/digital stuff. But you have much more experience than myself.

Cheers,

BuriedCode.


Buriedcode is offline   Reply With Quote







LPF List of Laser Pointer Companies (link opens new window)







Old 08-27-2012, 03:59 AM #2
Class 1M Laser
 
Join Date: Apr 2011
Location: A random place in north dakota.
Posts: 213
Rep Power: 20
random person has much to be proud ofrandom person has much to be proud ofrandom person has much to be proud ofrandom person has much to be proud ofrandom person has much to be proud ofrandom person has much to be proud ofrandom person has much to be proud ofrandom person has much to be proud ofrandom person has much to be proud ofrandom person has much to be proud of
random person random person is offline
Class 1M Laser
 
Join Date: Apr 2011
Location: A random place in north dakota.
Posts: 213
Rep Power: 20
random person has much to be proud ofrandom person has much to be proud ofrandom person has much to be proud ofrandom person has much to be proud ofrandom person has much to be proud ofrandom person has much to be proud ofrandom person has much to be proud ofrandom person has much to be proud ofrandom person has much to be proud ofrandom person has much to be proud of
Default Re: Circuit protection for UV diode

A 0.1uF ceramic cap should be all you need for ESD protection. The low ESR on those should protect the diode from any ESD event. I'd tie that directly to the leads coming from the module. Then after the cap i'd just throw in a standard diode such as a 1n4001 and you should be all set to go. Everything else such as current limiting...ect i'd do at the driver end. Nothing overly fancy is necessarily needed for basic diode protection.

Its surprising that you have killed 2 already. I'd ensure that you got the polarity correct for the particular diode that your using and that your staying well below the recommended current max for that diode as well as ensuring proper heatsinking. Also, sounds like you might got access to an oscilloscope. Make sure you verify that the driver that your using is indeed outputting the proper current and that your driver doesn't have any turn-on transients.

Well... thats all I could think of off the top of my head. Do all that and your diode should last awhile.
__________________



Last edited by random person; 08-27-2012 at 04:00 AM.
random person is offline   Reply With Quote
Old 08-27-2012, 09:47 AM #3
lasersbee's Avatar
Class 4 Laser
 
Join Date: Sep 2008
Location: Quebec, Canada
Posts: 15,717
Rep Power: 40861
lasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond repute
lasersbee lasersbee is offline
Class 4 Laser
lasersbee's Avatar
 
Join Date: Sep 2008
Location: Quebec, Canada
Posts: 15,717
Rep Power: 40861
lasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond repute
Default Re: Circuit protection for UV diode

You could try one of these...

LASORB - ESD absorber for laser diodes


Jerry


You can contact us at any time on our Website: J.BAUER Electronics
__________________

J.BAUER Electronics Home Page

LaserBee Laser Power Meter Products meet your needs
at affordable Prices:
See them all here on LPF

LaserBee Power Meter products ALWAYS in Stock
and ready to ship

Also available on eBay:Check availability here..

Subsidary: Pharma Electronic Solutions


This banner is available to and can be copied/used FREE by any LaserBee owner
lasersbee is offline   Reply With Quote
Reply





Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On











Loading








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes






Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 08:50 PM.


Powered by: vBulletin
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
Privacy Policy | Advertising Disclaimer | Terms of Use
Copyright (C) 2017 Laser Pointer Forums, LLC