公开(公告)号：EP3262897A1

公开(公告)日：2018-01-03

申请号：EP16708336.9

申请日：2016-02-25

申请人： Osram Sylvania Inc.

发明人： WEI, Jinsheng ,  JOHNSEN, Andrew ,  JAYABALAN, Ranjit ,  KUMAR, Nitin

IPC分类号： H05B33/08

CPC分类号： H05B37/0209 ,  H05B33/0815 ,  H05B33/0842

摘要： An active damping circuit and system including the same are disclosed. The active damping circuit includes a first resistor, a second resistor, a third resistor, a first transistor, a second transistor, a capacitor, and a microcontroller. The first resistor is connected to a base of the first transistor, and to the microcontroller output. The second resistor is connected to a positive voltage, and to a collector of the first transistor and a gate of the second transistor. The third resistor is connected to a logic ground, and to a source of the second transistor. The capacitor is connected to the collector of the first transistor, the second resistor, and the gate of the second transistor. A drain of the second transistor, and the first capacitor, and the second capacitor, and the microcontroller output, are also connected to the logic ground. An emitter of the first transistor is connected to ground.

公开(公告)号：EP3262898A1

公开(公告)日：2018-01-03

申请号：EP16708906.9

申请日：2016-02-25

申请人： Osram Sylvania Inc.

发明人： WEI, Jinsheng ,  JOHNSEN, Andrew ,  JAYABALAN, Ranjit ,  KUMAR, Nitin

IPC分类号： H05B33/08

CPC分类号： H05B37/0209 ,  H05B33/0815 ,  H05B33/0842

摘要： An active damping circuit and system including the same are disclosed. The active damping circuit includes a first resistor, a second resistor, a third resistor, a first transistor, a second transistor, a capacitor, and a microcontroller. The first resistor is connected to a base of the first transistor, and to the microcontroller output. The second resistor is connected to a positive voltage, and to a collector of the first transistor and a gate of the second transistor. The third resistor is connected to a logic ground, and to a source of the second transistor. The capacitor is connected to the collector of the first transistor, the second resistor, and the gate of the second transistor. A drain of the second transistor, and the first capacitor, and the second capacitor, and the microcontroller output, are also connected to the logic ground. An emitter of the first transistor is connected to ground.

公开(公告)号：EP2783552B1

公开(公告)日：2016-02-03

申请号：EP12795927.8

申请日：2012-11-06

申请人： Osram Sylvania Inc.

发明人： KUMAR, Nitin ,  BAKRE, Shashank ,  ZIEGLER, Markus

IPC分类号： H05B41/28 ,  H05B41/04

CPC分类号： H05B41/042 ,  H05B41/2806 ,  Y02B20/22

公开(公告)号：EP2522205B1

公开(公告)日：2015-08-26

申请号：EP11732252.9

申请日：2011-01-07

申请人： Osram Sylvania Inc.

发明人： KUMAR, Nitin ,  BAKRE, Shashank ,  BREUER, Christian

IPC分类号： H05B41/298 ,  H05B41/46 ,  H05B41/285

CPC分类号： H05B41/2855

公开(公告)号：EP2783552A1

公开(公告)日：2014-10-01

申请号：EP12795927.8

申请日：2012-11-06

申请人： Osram Sylvania Inc.

发明人： KUMAR, Nitin ,  BAKRE, Shashank ,  ZIEGLER, Markus

IPC分类号： H05B41/04

CPC分类号： H05B41/042 ,  H05B41/2806 ,  Y02B20/22

摘要： A ballast to energize a lamp is provided. The ballast comprises a buck converter connected to an inverter via a switching component. The buck converter includes a transistor, a capacitor, a diode, and an inductor. The switching component has a predetermined breakover voltage value and is configured to provide a start up signal to the inverter when voltage at the switching component increases to the predetermined breakover voltage value. A control circuit is configured to monitor the voltage at the switching component while the voltage at the switching component increases to the predetermined breakover voltage, and is configured to generate a gate drive pulse at a gate terminal of the transistor when the voltage at the switching component reaches a predetermined voltage that is less than the breakover voltage of the switching component.

公开(公告)号：EP2522205A2

公开(公告)日：2012-11-14

申请号：EP11732252.9

申请日：2011-01-07

申请人： Osram Sylvania Inc.

发明人： KUMAR, Nitin ,  BAKRE, Shashank ,  BREUER, Christian

IPC分类号： H05B41/298 ,  H05B41/46

CPC分类号： H05B41/2855

摘要： A lamp driver circuit to selectively energize one or more lamps is provided. The inverter circuit has a transformer with primary and secondary windings to provide voltage to the lamps. A filter is connected to the primary winding to receive a primary winding signal representative of the voltage across the primary winding. The primary winding signal has a frequency spectrum and the filter detects a particular characteristic of the frequency spectrum that is indicative of an end of life (EOL) condition of the one or more lamps. A control circuit is connected to the inverter circuit and to the filter. The control circuit is configured to discontinue energizing of the one or more lamps by the inverter circuit when the particular characteristic of the frequency spectrum of the primary winding signal is detected by the filter.