Uniform intensity led driver circuit
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United States of America Patent
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-
Jan 5, 1988
Issued Date -
N/A
app pub date -
Jun 11, 1986
filing date -
Jun 8, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A unique driver circuit for providing constant average current through a driven element or elements having varying impedance first samples the impedance at the drive terminal in order to determine impedance of the driven elements. For increasing impedance of the driven elements, the duty cycle of the driving signal is increased, thereby resulting in a near-constant average current through the driven elements when the number of driven elements in series is changed.
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