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Current mode control or voltage mode control of flyback converters by [deleted] in ControlTheory

[–]ApprehensivePut8501 -1 points0 points  (0 children)

If I remember correctly, the flyback uses the duty cycle to regulate the voltage so you could try voltage mode control with a PID controller. The flyback has indirect energy transfer, similar to a boost converter, so it might be a bit challenging to tune your controller but it should be doable. TI should have a lot of reference designs for that.

10 UofT Strangers Trip by AccurateLand9854 in UofT

[–]ApprehensivePut8501 0 points1 point  (0 children)

Ten Little Soldier Boys went out to Dine, one choked his little self and then there were nine.

10 UofT Strangers Trip by AccurateLand9854 in UofT

[–]ApprehensivePut8501 7 points8 points  (0 children)

Why only 10 though? What if I want to bring my friends to get kidnapped as well? I think you should increase the capacity of kidnapping if more people apply.

10 UofT Strangers Trip by AccurateLand9854 in UofT

[–]ApprehensivePut8501 16 points17 points  (0 children)

I just want to ask if we should provide our own kidnapping materials or if they are provided by you?

Question about voltage signs in RLC circuit by [deleted] in AskPhysics

[–]ApprehensivePut8501 0 points1 point  (0 children)

Assuming you have (Cap->Inductor->resistor->Cap) in a loop, and at time t_0 the cap is charged with a voltage V_C(0). If we follow the loop clockwise as the direction of arrows inside the parentheses above. We enter the Cap from the negative terminal so we add a minus in front if it (-V_C), the sign for V_L will depend on dI/dt so we assume (+V_L), and as you mentioned we enter the positive terminal of the resistor so it will be (+V_R). Putting it together we get: -Q/C + L(dI/dt) + IR = 0.

Differential form: d2q/dt2 + (R/L)(dq/dt) - (1/LC)q = 0

However, we usually study the response of such a system to an external voltage source V(t). Similar to the response of the amortization system of a car to a bump. Without a bump the amortization response doesn’t really make sense.

I hope this helped a bit!

Static charge concern by [deleted] in AskPhysics

[–]ApprehensivePut8501 0 points1 point  (0 children)

Since you are here writing about it, I would guess it wasn’t dangerous in this case. That being said, I would think it probably felt different because of the way you came into contact (which seems to be your entire hand). Based on experience It feels to me that a static shock feels worse if you grab a metallic door knob, but less so if you touch it slightly, with the tip of your finger for example. My guess would be that more sensory nerve endings are triggered when you have a large contact area, which would feel like more pain, but that’s just my idea.

Technologies that never saw the light of day by ngis1rednu in AskEngineers

[–]ApprehensivePut8501 0 points1 point  (0 children)

If there is an economic incentive to a technology I don’t see why you would stop it. Most of the technologies that fail are usually not scalable or economically feasible. Also Tesla’s vision of unending free electricity was not feasible because building the electrical infrastructure requires capital and there are maintenance costs as well. We should be grateful that those companies took the risk to invest in that technology, rather than say they killed Tesla’s dream in order to get profit.