I broke physics

164

01:43:11

Averaging the sawtooth waves:
407 / 4 = 101.75mA * 5V = 508.75mW input
210.5V into 1MΩ = 44.3mW positive output
857V into 1MΩ = 734.4mW negative output
Total output 778.7mW

Maybe I misunderstood the shapes of the graphs, but I don't think so. Perhaps the simulator isn't reporting peak voltage correctly. The values do seem to change when I slow the simulation down, but I don't have the patience today.

published 1 year ago

1 year ago

Good day, you didn’t broke any law of physics, capacitors and inductors can store “energy” over the time in some way, take a look at these subjects in order to get the full view on this circuit (capacitors, inductors in DC and AC, buck converter circuits, boost converters). Good luck

Nicholasmart

1 year ago

graph looks good!

eekee

1 year ago

@D1, check the numbers: 509mW in, 779mW out. :)

592azy2circuitdude

1 year ago

Perhaps it has something to do with instantaneous power: p(t) = v(t) × i(t). Then integrating p(t) over the time interval will give a more accurate number for the power than a simple average.

592azy2circuitdude

1 year ago

Here's another thought... As soon as the relay flips, most of the energy (power) of the inductor is released into the capacitors, resulting in a negative power consumption. The capacitors then give back some of that power to the resistors, which is the number you calculated. These 2 powers could combine to give the same number as power in. Is this the same principle at work in charge pumps or boost power supplies?

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