Patents by Inventor Johnny D. ENGFELDT

Johnny D. ENGFELDT has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for controlling an electrochromic device and an electrochromic device
    Patent number: 10649300
    Abstract: A method for controlling an electrochromic device comprises obtaining (210) of a target colouring level and a measure of an initial colouring level. A measure of an initial open circuit voltage between electrodes of the electrochromic device is obtained (220). A voltage applied between the electrodes is calibration ramped (230). A calibration charging current is measured (232) during the calibration ramping of the voltage. The calibration ramping of the voltage is interrupted (236), intermittently and temporarily and a calibration open circuit voltage is measured (238). The calibration ramping is stopped (240) when a calibration condition is met. A constant main charging/discharging voltage between the electrodes of the electrochromic device is applied (250). The voltage is selected in dependence of the ramped voltage when stopped. Application of a voltage between the electrodes is removed (270) when target colouring level is reached. An electrochromic device capable of performing such procedure is disclosed.
    Type: Grant
    Filed: January 9, 2017
    Date of Patent: May 12, 2020
    Assignee: CHROMOGENICS AB
    Inventors: Johnny D. Engfeldt, Greger Gregard
  • METHOD FOR CONTROLLING AN ELECTROCHROMIC DEVICE AND AN ELECTROCHROMIC DEVICE
    Publication number: 20190018298
    Abstract: A method for controlling an electrochromic device comprises obtaining (210) of a target colouring level and a measure of an initial colouring level. A measure of an initial open circuit voltage between electrodes of the electrochromic device is obtained (220). A voltage applied between the electrodes is calibration ramped (230). A calibration charging current is measured (232) during the calibration ramping of the voltage. The calibration ramping of the voltage is interrupted (236), intermittently and temporarily and a calibration open circuit voltage is measured (238). The calibration ramping is stopped (240) when a calibration condition is met. A constant main charging/discharging voltage between the electrodes of the electrochromic device is applied (250). The voltage is selected in dependence of the ramped voltage when stopped. Application of a voltage between the electrodes is removed (270) when target colouring level is reached. An electrochromic device capable of performing such procedure is disclosed.
    Type: Application
    Filed: January 9, 2017
    Publication date: January 17, 2019
    Inventors: Johnny D. ENGFELDT, Greger GREGARD