Dynamic Load?

Abut 35 years ago I was a very junior tech wire wrapping "logic boards" for a hug security console that contained a drum printer, clock and annauciator panel consisting of hundreds of lights denouncing what the various portals in plant were open or closed. There was more to it but I don' remember. The project went smoothly and was delivered on time and within the budget. We invited the chief of security to the command post and briefed him on various operations. In the midst of getting familiar with various functions he asked "And what is this button marked LT do?" "Oh that is the Lamp Test button. It turns on all of the annauciator lamps on at once so that you can easily spot if any are burned out. Go ahead, try it I urged him wit confidence." So he pushes the button and there is a groan from underneath the console as the SCR regulated power supply struggles to keep up with the load. Every light ( there were hundreds of them) light up and he satisfyingly lets go of the button. There was tick sound followed by snap crackle and pop as every circuit board self destructed. Lots of smoke too. Although we tested the lamp test function we did not test it under the full load. Back in the lab we discovered that when the full load of 20 or so amps was suddenly reduced to 1Amp, the 5 volt "regulated" output shot up to 20 volts. That is when I learned the importance of verifying the dynamic load.

Regards,

Boris Mohar

Got Knock? - see: Viatrack Printed Circuit Designs (among other things)

void _-void-_ in the obvious place

Now I understand the term, Dynamic Load.

But what does it mean by dynamic load circuits > >

What happens to the power supply if you cycle the load from maximum to minimum every 5 seconds for 5 minutes, say?

Do you mean that it is the circuit designed to compensate the dynamic variation of the output load?

Regards

Homer J Simps>

It is a test you need to perform.

Ok

I would better chek it out in the designs I am studying.

Thanks for the h> > Do you mean that it is the circuit designed to compensate the dynamic

See if you can get the 50th anniversary issue of EDN magazine

Your article of interest

That whole issue is pretty good.

Regards,

Boris Mohar

Got Knock? - see: Viatrack Printed Circuit Designs (among other things)

void _-void-_ in the obvious place