VAWT 035 - LM2596 Based Controller Update Dec 27, 2014

We finally had enough wind to test the LM2596 controller. I wanted to highlight two improvements over the MC34063 controller. This controller limits the current on a cycle-by-cycle basis so I believe the current reading on the Watts-Up meter is closer to reality. The previous controller used a low frequency PWM signal to turn it full-on and full-off. So when it was on, the controller was hitting its current limits while the capacitors discharged. The Watts-Up meter would pick up on the current peaks and display a false peak current. The second improvement is in the software. As the input voltage nears the point where it will trip the SCR, the controller starts calling for higher levels of current (a more aggressive current vs. RPM curve) in order to slow the turbine and delay shutting it down with the SCR.
This video is the last in my series on the 0.35 m^2 vertical axis wind turbine. My hope was to be able to produce them for a reasonable price. But I don't think it would be worthwhile to make and sell them for less than $800, and there did not appear to be a market. I gave this one away and have since moved on to other projects and turbines. (9/16/18)