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Solar Charge Controller

Discussion in 'Renewable Energy' started by Sonia123, Dec 7, 2012.

  1. Sonia123

    Sonia123 New Member

    Sep 21, 2011

    Following is the circuit I took from a site which I successfully built. But here's the question, I desire to compute transfer function of this feedback circuit. It would have been great if I would be having only R L C stuff. But since I am having 555 timer also, I am badly in need of your valuable suggestions for numerical computation of the transfer function i.e., Output voltage / Input Voltage.
  2. MikeMl

    MikeMl Well-Known Member Most Helpful Member

    Mar 17, 2009
    AZ 86334
    The 555 is being used as a voltage sensor switch with separately adjustable cut-in and cut-out. The 7805 provides a 5V (poor) voltage reference to the 555, including biasing the two voltage comparators inside the 555 to (5/3)V and (2*5/3)V. The transfer function is left to you, but it is non-linear, and includes hysteresis.

    The circuit is poorly thought out. Overly complicated for what it does. The adjustments overlap in way that makes it extremely difficult to get it set up initially. I would have done it differently.
    Last edited: Dec 7, 2012

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