"Miller" solar engine

Published:2013/6/27 21:23:00 Author:muriel | Keyword: "Miller" solar engine | From:SeekIC

The Miller solar engine uses a 1381* voltage detector (a.k.a., a voltage supervisor) IC to drive a voltage-based (type 1) solar engine. The 1381 is normally used to reset CPUs and Micros when the power supply drops too low for reliable operation. So 1381s detect and switch when the input voltage crosses the rated upper and lower threshold voltages. The upper- and lower-switching voltages are slightly overlapped so that the turn-on voltage is a few hundred mV above the turn-off voltage. This hysteresis keeps input noise (around the switching threshold) from resulting in multiple output cycles as the transition occurs. The Miller SE is designed to increase the 1381 hysteresis to a larger value. This is done by putting a small capacitor across the input legs of the 1381, and a diode between the 1381 and the true ground. Here's the basic circuit (I show it as a modification to the vanilla 1381 circuit, where added components are red, deleted components are grayed out, and common components are in black):



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