Driver for electrochromic glass unit
First Claim
1. A method for controlling an electrochromic device, comprising:
- applying a constant supply current to the electrochromic device;
determining an amount of charge transferred to the electrochromic device, as a function of time and current supplied to the electrochromic device;
ceasing the applying the constant supply current, responsive to a sense voltage reaching a sense voltage limit;
applying one of a variable voltage or a variable current to the electrochromic device to maintain the sense voltage at the sense voltage limit, responsive to the sense voltage reaching the sense voltage limit; and
terminating the applying the variable voltage or the variable current to the electrochromic device, responsive to the determined amount of charge reaching a target amount of charge.
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Accused Products
Abstract
A method for controlling an electrochromic device is provided. The method includes applying a constant supply current to the electrochromic device and determining an amount of charge transferred to the electrochromic device, as a function of time and current supplied to the electrochromic device. The method includes ceasing the applying the constant supply current, responsive to a sense voltage reaching a sense voltage limit and applying one of a variable voltage or a variable current to the electrochromic device to maintain the sense voltage at the sense voltage limit, responsive to the sense voltage reaching the sense voltage limit. The method includes terminating the applying the variable voltage or the variable current to the electrochromic device, responsive to the determined amount of charge reaching a target amount of charge.
25 Citations
30 Claims
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1. A method for controlling an electrochromic device, comprising:
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applying a constant supply current to the electrochromic device; determining an amount of charge transferred to the electrochromic device, as a function of time and current supplied to the electrochromic device; ceasing the applying the constant supply current, responsive to a sense voltage reaching a sense voltage limit; applying one of a variable voltage or a variable current to the electrochromic device to maintain the sense voltage at the sense voltage limit, responsive to the sense voltage reaching the sense voltage limit; and terminating the applying the variable voltage or the variable current to the electrochromic device, responsive to the determined amount of charge reaching a target amount of charge. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An electronic driver for an electrochromic device, comprising:
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a power supply; and a power supply control module configured to perform actions comprising; supplying a constant current from the power supply to the electrochromic device; stopping the supplying the constant current when one of a sense voltage of the electrochromic device attains a sense voltage limit or an amount of charge transferred to the electrochromic device attains a target amount of charge; and controlling one of a variable voltage or a variable current from the power supply to the electrochromic device to maintain the sense voltage at the sense voltage limit while the amount of charge transferred to the electrochromic device is less than the target amount of charge. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. An electronic driver for an electrochromic device, comprising:
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a voltage detecting circuit configured to measure a sense voltage of sense voltage terminals of the electrochromic device; a reversible constant current supply configured to supply a constant current to the electrochromic device until one of the sense voltage achieves a sense voltage limit or an amount of charge transferred to the electrochromic device achieves a target amount of charge; and a reversible variable voltage supply configured to supply a variable voltage to the electrochromic device to keep the sense voltage at the sense voltage limit, responsive to the sense voltage achieving the sense voltage limit, until the elapsed time reaches a predetermined time duration. - View Dependent Claims (25, 26, 27, 28, 29, 30)
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Specification