Apparatus for the control of an electrochromic window
First Claim
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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Abstract
An apparatus for the control of an electrochromic window having a three-electrode structure (2, 8, 5) comprises a comparator (12) to maintain within safe limits the potential difference of the electrode (2) and the reference electrode (5), and a shunt unit (16) to switch off the power supply when the current falls below a lower limit and a unit for controlling the coloring density on the basis of the quantity of charge supplied or the optical density of the coloring (FIG. 2).
59 Citations
16 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification