Control circuit for a solar-powered rechargeable power source and load

  • US 5,041,952 A
  • Filed: 07/31/1989
  • Issued: 08/20/1991
  • Est. Priority Date: 07/31/1989
  • Status: Expired due to Term
First Claim
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1. A circuit for controlling the recharging of a rechargeable power source with a photovoltaic panel and for controlling the discharge of the rechargeable power source into a load, comprising:

  • a rechargeable power source;

    a photovoltaic panel operably connected to the rechargeable power source for supplying a charging current to the rechargeable power source whenever the voltage across the photovoltaic panel is greater than the voltage across the rechargeable power source by a predetermined amount;

    means for substantially blocking current flow from the rechargeable power source to the photovoltaic panel;

    a load; and

    switching means responsive too the voltage across the photovoltaic panel;

    for connecting the load across the rechargeable power source when the voltage across the photovoltaic panel drops below a load turn-on threshold, andfor disconnecting the load from the rechargeable power source when the voltage across the photovoltaic panel is above a load turn-off threshold, wherein said load turn-off threshold is unequal to said load turn-on threshold.

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