If the multi-string controllers are switched-mode, then we have the RFI
problem again.
Or, can the switching frequency be set to 500 Hz, so the 10th harmonic
becomes 5 kHz which is below 9 kHz ?
twisting the wires will also help for the frequency range 9 kHz to 30 MHz.
Rene Charton
"Brian Oconnell"
<oconnellb@TAMURA
CORP.COM> To
Sent by: <[email protected]>
[email protected] cc
Subject
03/02/2013 03:06 RE: LED Chamber Lighting - drivers
AM outside the chamber
Please respond to
<oconnellb@TAMURA
CORP.COM>
Most mondo very mucho correct about string current imbalance. Look at
reference designs by TI and others that use multi-string controllers.
Brian
-----Original Message-----
From: [email protected] [mailto:[email protected]]On Behalf Of John
Woodgate
Sent: Friday, March 01, 2013 10:33 AM
To: [email protected]
Subject: Re: LED Chamber Lighting - drivers outside the chamber
In message <[email protected]>,
dated Fri, 1 Mar 2013, "ce-test, qualified testing bv - Gert Gremmen"
<[email protected]> writes:
>I know the topics about LED current sourcing and temp coefficient, but
>as my power source is limited at 3 amps, which also is the full load
>current of the LEDs, there is no risk of dead LEDS due to temp runaway.
>There are 10 LEDS in series and 10 of these chains in parallel.
I hope you are right but 'NTC' plus 'parallel' can spell 'current
hogging'.
Incidentally, it's not 'luminary' (a sort of up-market celebrity) but
'luminaire'.
--
OOO - Own Opinions Only. See www.jmwa.demon.co.uk
SHOCK HORROR! Dinosaur-like DNA found in chicken and turkey meals
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
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