Is a
Patent attributes
Patent Applicant
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Stefan J. Kristjansson0
Date of Patent
January 28, 2020
Patent Application Number
16394856
Date Filed
April 25, 2019
Patent Primary Examiner
Patent abstract
The present concepts relate to a negative rail generator that temporarily self-generates a negative voltage rail to increase the voltage difference across a light emitting diode (LED) to be greater than the positive source voltage that is available. As such, the voltage difference provides sufficient headroom to exceed the minimum forward voltage required to conduct the LED with constant current. In one example, the negative rail generator may include a capacitor, a diode clamp, and a transistor. The negative rail generator and the LED may be operated in synchronization by a common PWM signal. The negative voltage rail can be generated without adding a switched-mode power supply (SMPS) or a charge pump.
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