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Based loosely on the Ainslie circuit, this oscillator exhibits a negative mean power computation when measured the same way.
Here is the schematic and some scope shots of the indicated points on the schematic. I'm sure a number of improvements can be made with this design. Also, I've not built this, so some tweaking may be necessary to get it to work for real. This is a simulation.
Total battery power is about 130mW. Negative mean is about -4W. The LED (simulated by 2x 1N4007 diodes) should be fully illuminated.
Here are the parts:
1) 2N7000 (1)
2) 1N4007 (1)
3) 3.3uH inductor (4)
4) 1uF film cap (1)
5) 9V battery (1)
6) 1 Ohm CSR (1)
7) LED or 100 Ohm (1)
8] 30k resistor (10k to 50k) (1)
9) 1N5226 3.3V zener (1)
Some "power measurements" of the portable negative mean power oscillator:
With the battery probe at the old familiar (but erroneous) measurement point as shown in the schema01, the mean battery power is -4.2W.
We can "improve" this already improved negative mean by moving the "battery" probe to the MOSFET Drain as shown in schema02. At this point the mean battery power is -6.3W.
When the battery probe is moved to measure directly across the battery with a differential probe (not shown), the mean power computation is +0.133W. This is the "actual" battery power being delivered to the circuit. See last scope shot.
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Topic: A Compact Low Power "Ainslie" Oscillator (Read 7601 times)
