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Controlling transitions in optically switchable devices

  • US 9,645,465 B2
  • Filed: 11/03/2015
  • Issued: 05/09/2017
  • Est. Priority Date: 03/16/2011
  • Status: Active Grant
First Claim
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1. An energy management system, the system comprising:

  • (a) a Building Management System (BMS);

    (b) one or more windows capable of undergoing reversible optical transitions, wherein at least one of the windows comprises a first conductive layer, a second conductive layer, and an electrochromic layer between the first conductive layer and the second conductive layer;

    (c) a window controller for controlling the one or more windows, the window controller comprising;

    (i) at least one input for receiving data,(ii) at least one output for transmitting data, and(iii) one or more processors configured to control functions comprising;

    measuring transmittance of at least one of the one or more windows,powering a reversible optical transition between at least a bleached end state and a colored end state of the at least one of the one or more windows, wherein powering is based on the measured transmittance of the at least one window, wherein powering the reversible optical transition comprises applying a DC voltage to the first conductive layer and to the second conductive layer to provide an electrical potential across the electrochromic layer establishing a load, wherein the load is floated, andcommunicating with a separate communication node; and

    (d) a network over which the window controller, the BMS, and the one or more windows capable of undergoing reversible optical transitions can communicate.

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