Electric lamp and discharge devices: systems – Discharge device and/or rectifier in the supply circuit – Flashers
Reexamination Certificate
2005-02-22
2005-02-22
Wong, Don (Department: 2821)
Electric lamp and discharge devices: systems
Discharge device and/or rectifier in the supply circuit
Flashers
C340S331000
Reexamination Certificate
active
06858994
ABSTRACT:
A traffic signal installation with an LED light source (2), comprising:an input (38, 40) for connection of a current source;furthermore, at potential levels between the upper potential (16) and the base potential (18):a plurality of LEDs (4) arranged in at least two series connections of several LEDs that are connected in parallel;a coil (6) provided in series with the LEDs (4);a recovery diode (8) provided in parallel to the LEDs (4) and the coil (6) and having its forward direction opposed to that of the LEDs (4); anda rapid electronic switch (10) provided in series with the LEDs (4), the coil (6) and the recovery diode (8) in parallel to the LEDs (4) and the coil (6); anda pulse generator (12) that is connected to the rapid electronic switch (12) and generates pulses that open and close the rapid electronic switch (10), said pulse generator (12) being a pulse-width modulator in particular in the form of an integrated component.
REFERENCES:
patent: 5850126 (1998-12-01), Kanbar
patent: 6629766 (2003-10-01), Cathel
patent: 6634779 (2003-10-01), Reed
patent: 6685339 (2004-02-01), Daughtry et al.
patent: 40 22 498 (1992-01-01), None
patent: 197 29 690 (1999-01-01), None
patent: 0 706 305 (2000-07-01), None
A Minh D
Kinney Michael K.
Rosenblatt Gregory S.
Sickinger Monika
Wiggin and Dana LLP
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