Electric lamp and discharge devices: systems – Current and/or voltage regulation
Reexamination Certificate
2007-10-01
2009-11-24
Owens, Douglas W (Department: 2821)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
C315S307000
Reexamination Certificate
active
07622871
ABSTRACT:
A LED driver circuit avoids undesirable light generated by a LED due to leakage current by shunting the output terminal to the feedback terminal during periods when it is desired that the LED remain turned off. The shunting operation is achieved by providing a switch (e.g., a FET) that is connected between the output and feedback terminals of the LED, and is controlled by the user supplied reference signal. During active operation (i.e., when the user supplied reference signal is “enabled” and the LED is lit), the switch remains open, allowing the driver circuit to generate the desired driving voltage across the LED. During inactive periods (i.e., when the user supplied reference signal is “disabled” and the LED is intended to be off), the switch is closed, which couples the output and feedback terminals to generate an essentially zero voltage drop across the LED.
REFERENCES:
patent: 6586890 (2003-07-01), Min et al.
patent: 6867757 (2005-03-01), Nakamura
patent: 7317403 (2008-01-01), Grootes et al.
patent: 2007/0229001 (2007-10-01), McIntosh et al.
Awalt Thruston
Patel Hardik Dineshchandra
Bever Patrick T.
Bever Hoffman & Harms LLP
Micrel Incorporated
Owens Douglas W
Vu Jimmy T
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