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Apparatus for the control of an electrochromic window

  • US 5,654,736 A
  • Filed: 04/21/1995
  • Issued: 08/05/1997
  • Est. Priority Date: 04/27/1994
  • Status: Expired due to Fees
First Claim
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1. A control apparatus of an electrochemical electrochromic window for the control of the colour density thereof, said window including an electrolyte, a colouring electrode and a counter electrode in contact with said electrolyte, and a reference electrode showing a potential difference with respect to said colouring electrode, comprising:

  • an electronic comparator for comparing said potential difference with a potential selected in said comparator within safe working upper and lower limits for the transport of ions in said electrolyte and production of colouration or decoloration respectively of the window;

    a constant current supply of pre-selectable initial current value for supplying the colouring current to the window;

    a current regulator controlling the current supplied to the window according to the output of said comparator to maintain the potential difference within said safe working potential limits;

    a shunt unit controlling said current supply to switch it off when the current in the window falls below a pre-selectable lower limit; and

    means for pre-selecting the colour density of the window and switching said current supply (13) on or off to produce said colouring with said pre-selected density.

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