Re: [doc] Re: LED-lights flickering (Was: Re: Who can supply correct LEDs?)

[Nick Tomlinson <nickandkathryntomlinson@xxxx>]

That is true.
 
I program the PLC logic controllers that control large plant drives/ automation for industry/ chemical plant/ water works/ nuclear fuel etc. Now these2000 Amp motors are really big to drive pumps that are twice as big as me to supply mega-litres per minute. Top heavy stuff. They need thier own cable 4 inch thick. I'd hate to touch one of these bare cables and fry myself. Mind you getting the code wrong makes it expensive to put right !
 
Makes the alternator on the delorean look even more puny !
 
Nick.

Martin Gutkowski <webmaster@xxxx> wrote:
It's also the method behind speed controlling large DC motors, like in 
our robot. Here's a challenge for you Nick: A full H bridge power 
(speed) controller capable of running anything up to 350A _continuous_ 
and still switching (ie not 100% duty) at up to 36V with adjustable 
dynamic current limiting. We have two in Draven that my friend Joe built 
- each are in a box 150mm x 100mm x 35mm and put out no appreciable heat 
even after the drive motors are too hot to touch. We're really rather 
proud of them.

BTW the term I know is Pulse Width Modulation - PWM.

Best Wishes

Martin

Nick Tomlinson wrote:

>Jan, the block wave (or square wave) control principle is exactly the sameas that which controls the frequency valve of the fuel injection wrt the cycle time' duty cycle. The simple ideas are the best.
> 
>Nick.
> 
>
> 
>



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