I designed the following circuit on my emulator and it appears to put out more power then is put in.
Could someone run this on another emulator to check it out.
The transformer is 2 millihenreys 1:1 ratio.
Hi,
I wonder if your circuit simulator considers the current 852.06mA and voltage 119.29V as true RMS values? Or they are peak values? (the product of the two values gives the 101.64W) By the way, at WHICH circuit points are these two values shown? would you identify exactly all the current and voltage points that are shown?
Your output power in the 140 Ohm resistor (assuming it as the load) comes from two power quantities:
1) the supply voltage 11V continuosly feeds it with a DC power of (11*11)/140=0.8642W, this is very small of course
2) the switching transistor pumps power into it through the transformer in every half wave oscillation periode,
so the instantenous sum of these two power quantities constitutes the output power and this should be conpared to the total input power your oscillator transistor and the switching transistor consumes.
Is your simulator considering these?
rgds, Gyula
The circuit simulator applet I used is available at the following site:
http://www.falstad.com/circuit/
Anyone wanting to investigate it further need just download it and build this circuit with it.
Measurements from left to right:
573 mV is the 8mH Inductor
853mA, 119V and 101W is the 140 ohm resistor
-1.95W is measured at the +11V input
72.87mA is across diode
120.5V is across the transistor.
These measurements are given by selecting these points and telling the emulator to display them.
The main point is the input power is -1.98 Watts and the output across 140 ohm resistor is 101.79W
I also built this same circuit replacing the (Colpitts. Oscillator) with a 555 timer and an inverter.
The circuit simulator applet is free to download and comes in handy for many things, it was just updated last month.
.
Hi,
Thanks for the further infos.
I would like to draw your attention to a well supported yet free Spice based circuit simulator the LTSpice/SwitcherCAD from Linear Tech. It includes an efficiency calculation possibility too because originally they developed it for simulating their switch mode power supply IC circuits (DC-DC converters). If you feel like to have a look at it, here is a link: http://www.linear.com/designtools/software/
Support is available at a yahoo tech group: http://tech.groups.yahoo.com/group/LTspice/
I usually do not believe in simulators when they show something 'unusual'. Because they are designed to consider conventional electrical engineering where extra power cannot be created....
Personnaly I do not believe your circuit shown can develop 101W power across the 140 resistor in practice... sorry.
rgds, Gyula
I actually built a replica of it on my proto board and didn't get any excess energy from it.
The reason I posted this is to test other circuit simulators to see if they make the same errors.
If simulators are supposed to duplicate pure electronics theory then this would show a flaw in it.
But the second transistor section does resemble the Joule Thief circuit and this was before I knew about it.
I have designed other circuits with simular results. I even managed to design one that will run itself.
And if not regulated will run away producing more and more power. I haven't tried proto boarding that one yet. ;D
Hi!
Thank you for reporting this!
I think you may remember a switched circuit with capacitors called EMF recycler where capacitors were connected in series and then discharged to other capacitors in parallel, then the cycle reversed, all these controlled by relays then with transistor switches? Member drspark simulated it a lot by Circuitmaker software and got nice overunity simulations.
Several practical replications were made but none of them showed overunity, to my knowledge. Here is the link:
http://www.overunity.com/index.php?topic=1942.0 (a very long thread...)
rgds, Gyula
AbbaRue
Quote
I even managed to design one that will run itself.
And if not regulated will run away producing more and more power. I haven't tried proto boarding that one yet. ;D
End quote
AbbaRue
That sounds like a great project for the class :o
Chet