| Electronics > Beginners |
| Pratical Hardware Questions for DIY Electronic Load |
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| t1d:
--- Quote from: Mechatrommer on September 24, 2018, 10:19:14 am --- --- Quote from: schmitt trigger on September 19, 2018, 04:36:11 pm ---Very interesting concept to include an external waveform generator input, to provide a a variable load to -let's say- test the a PSU stability. :-+ The maximum frequency would, of course, be limited to the frequency response limited by the integrating capacitor in the feedback loop. --- End quote --- the concept is more suited to 4 quadrant PSU/Load supply. with 1 quadrant load, you have to limit the FG signal to 1st quadrant region only. and you need to stick the V to A conversion formula in mind when adjusting FG magnitude so shunt wont go outside that region. --- End quote --- Hi, Mechatrommer. I have been studying on the needed converter and have realized that I don't know enough, to narrow my search, to be on point... For the quadrant converter, is what I need called a "Four Quadrant Converter?" Do you have a favorite circuit, for this purpose? I did breadboard just the driver circuit, with an LM741, to try the concept of reading the FG signal. That worked and all four quadrants, of the signal shape, did appear, on the oscilloscope, appropriately. But, you are saying a problem can arise, when you introduce the load, to the remainder of the circuit? For clarification, the shunt, that you speak of, is the current sink shunt, correct? Thank you, for the explanations. |
| Mechatrommer:
some explanation... http://www.epanorama.net/sff/Power%20Electronics/Power_Supplies-Linear/Four%20Quadrant%20Power%20Supply.pdf https://www.accelinstruments.com/Applications/TS200/Four-Quadrant.html but i think its not relevant to dynamic load circuit (1 quadrant aka +ve voltage and sink current). |
| t1d:
--- Quote from: Mechatrommer on September 27, 2018, 07:50:41 am ---some explanation... http://www.epanorama.net/sff/Power%20Electronics/Power_Supplies-Linear/Four%20Quadrant%20Power%20Supply.pdf https://www.accelinstruments.com/Applications/TS200/Four-Quadrant.html but i think its not relevant to dynamic load circuit (1 quadrant aka +ve voltage and sink current). --- End quote --- Thank you, for your super fast reply. I apologize, but I am not sure I understand... Are you saying that the information in the link is not relevant to fixing my circuit? Or, are you saying that the FG operation, of my circuit, will work, without any changes? I appreciate your continued help. |
| Mechatrommer:
--- Quote from: t1d on September 27, 2018, 08:35:30 am ---Are you saying that the information in the link is not relevant to fixing my circuit? --- End quote --- my reply to scmitt trigger concerning using FG to control dynamic load. since dynamic load only works as current sink (not current supply as in PSU) and +ve voltage (Vds), hence 1 quadrant... and a FG can generally output +ve and -ve voltage, ie 2 quadrant in your application (by applying "power source" to the dynamic load input), so we need some care on using FG in your circuit. for example if we feed -ve signal, by definition your dynamic load should supply current to DUT (-ve shunt voltage), but in reality its not (signal or current clipped will occur). --- Quote from: t1d on September 27, 2018, 08:35:30 am ---Or, are you saying that the FG operation, of my circuit, will work, without any changes? --- End quote --- it should work, not looking closely on your circuit, but user need to know what he is doing when applying FG signal into your circuit. btw, one good application to this is applying a suitable +ve volt PWM signal to the dynamic load to analyze DUT power transient respond, (as i've implemented internally in my dynamic load project) ymmv. |
| t1d:
Thank you, for straightening me out. "but user need to know what he is doing when applying FG signal into your circuit" Excellent advice. Obviously, I designed the circuit to work with my particular FG. But, for other folks' equipment... About pulsing... My FG has this feature. Good help... Thanks! |
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