Variable transmittance window system

  • US 10,359,682 B2
  • Filed: 10/03/2014
  • Issued: 07/23/2019
  • Est. Priority Date: 10/04/2013
  • Status: Active Grant
First Claim
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1. A variable transmittance window system of a vehicle, comprising:

  • at least one variable transmittance window;

    at least one energy harvesting device configured to generate electrical power;

    at least one energy storage device configured to be charged by the electrical power;

    window control circuitry configured to be powered by a power supply of the vehicle and at least one of the at least one energy harvesting device and the at least one energy storage device, the window control circuitry having processing circuitry and driver circuitry, the driver circuitry configured to receive control information from the processing circuitry to control a transmittance state of the at least one variable transmittance window;

    timer circuitry configured to control the supply of electrical power from at least one of the at least one energy harvesting device and the at least one energy storage device to the driver circuit until the expiration of a predetermined time period, wherein the timer circuitry is triggered to start timing of the predetermined time period upon the window control circuitry detecting that power is no longer being supplied from the power supply of the vehicle, and wherein the timer circuitry is configured to direct the driver circuitry to maintain the at least one variable transmittance window in at least a partially darkened state for the predetermined time period after power is no longer supplied by the vehicle;

    dropout detection circuitry for storing a charge on a dropout energy storage device while power is being supplied to the window control circuitry; and

    master control circuitry to monitor the window control circuitry.

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