Nitin Kumar, Age 508 Margaret Pl, East Brunswick, NJ 08816

7986111, Jul 26, 2011

May 28, 2009

12/474049

Shashank Bakre - Woburn MA, US
Nitin Kumar - Burlington MA, US

Osram Sylvania Inc. - Danvers MA

H05B 37/02

315308, 315224, 315247

A control circuit for use in a ballast configured for powering a first lamp set and a second lamp set. The second lamp set is operated via a controller and a second lamp driver circuit. The controller enables the second lamp driver circuit as a function of a monitored value corresponding to a current through a lamp of the second lamp set. The control circuit includes first and second input terminals for selectively connecting to the power supply. The control circuit reduces the monitored value as a function of a connection state of the first and second input terminals of the control circuit to the power supply. Thus, the control circuit causes the controller to selectively operate the second lamp driver circuit in order to energize the second lamp set in combination with the first lamp set.

8004198, Aug 23, 2011

May 28, 2009

12/474080

Shashank Bakre - Woburn MA, US
Nitin Kumar - Burlington MA, US

OSRAM SYLVANIA Inc. - Danvers MA

H05B 37/02

315 86, 315224, 315360, 315247, 315308

A ballast for driving one or more lamps includes a controller and a current reduction circuit for accelerating a controller reset. Upon detecting a fault, the controller disables the ballast for a preset period of time, and resets. The controller additionally resets when the ratio of a supplied second value to a supplied first value falls below a threshold value. The current reduction circuit reduces the supplied second value in less than the preset period of time, such that the ratio falls below the threshold value and the controller resets. An emergency lighting system includes the ballast as a primary ballast, a backup ballast, and a primary power source. The controller detects a fault if the primary power source de-energizes and the backup ballast disconnects the one or more lamps from the primary ballast. The current reduction circuit accelerates the reset of the controller when the primary power source de-energizes.

8008873, Aug 30, 2011

May 28, 2009

12/474141

Shashank Bakre - Woburn MA, US
Nitin Kumar - Burlington MA, US

OSRAM SYLVANIA Inc. - Danvers MA

H05B 37/02

315308, 315224, 315247, 315291, 315225

A restart circuit for causing an electronic ballast to perform a restart in response to reconnecting any lamp of a multiple lamp configuration of the electronic ballast to the electronic ballast is disclosed. The electronic ballast includes a filament health check circuit for providing a first current through a monitored filament of the lamps to a controller of the ballast. The controller restarts the electronic ballast when a determined ratio of the first current to a reference current indicates that the monitored filament has been disconnected or broken (i. e. , the first current substantially decreases) and is subsequently replaced or reconnected to the ballast (i. e. , the first current returns to a predetermined level). The ballast further comprises a dv/dt circuit for reducing the first current for a transient time period in response to reconnecting a filament other than the monitored filament to the ballast, causing the controller to restart the ballast.

8410713, Apr 2, 2013

Jan 7, 2011

12/986596

Nitin Kumar - Burlington MA, US
Shashank Bakre - Woburn MA, US
Christian Breuer - Newburyport MA, US

OSRAM SYLVANIA Inc. - Danvers MA

H05B 41/16
H05B 41/24
H05B 37/00
H05B 39/00
H05B 41/14
H05B 37/02
H05B 39/02
H05B 39/04

315254, 315200 R, 315209 R, 315212, 315246, 315247, 315291

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.

8487555, Jul 16, 2013

May 11, 2011

13/105095

Nitin Kumar - Burlington MA, US
Shashank Bakre - Woburn MA, US

Osram Sylvania Inc. - Danvers MA

H05B 37/02

315312, 315201, 315294, 315205

A bi-level lamp ballast to selectively operate two lamps is provided. The ballast includes a control circuit having an input, connected to a switching network, and an output, which provides a particular control signal based on the state of the switching network. The ballast also includes respective lamp control switches, each having respective outputs. The first switch is connected to the output and a ballast power supply. In its first state, it connects the ballast power supply to its first output, and in its second state, it connects the ballast power supply to its second output. The second switch is connected to the output and a ground. In its first state, it connects the ground to its first output, and in its second state, it connects the ground to its second output. The state of each lamp control switch depends on the control signal generated by the control circuit.

8547029, Oct 1, 2013

Jan 18, 2012

13/352429

Nitin Kumar - Burlington MA, US
Shashank Bakre - Woburn MA, US
Driss Baba - Swampscott MA, US

OSRAM SYLVANIA Inc. - Danvers MA

H05B 37/00

315201, 315209 R, 315291, 315307

A ballast for dimming a lamp is provided. The ballast includes an inverter circuit for providing a lamp current for energizing the lamp and a dim interface for receiving an input indicative of a selected lighting level. A control circuit is connected to the dim interface for generating a pulse-width-modulated signal having a duty cycle corresponding to the selected lighting level. A switching network is connected to the control circuit for receiving the pulse-width-modulated signal. The switching network operates between a conductive state and a non-conductive state as a function of the pulse-width-modulated signal. An impedance device is connected across the switching network and is configured for connecting in series with the lamp so that the impedance device receives the lamp current when the switching network is operating in the non-conductive state and the lamp current bypasses the capacitor when the switching network is operating in the conductive state.

8569966, Oct 29, 2013

Nov 22, 2011

13/302075

Nitin Kumar - Burlington MA, US
Shashank Bakre - Woburn MA, US
Markus Ziegler - San Pedro Garza Garcia, MX

OSRAM SYLVANIA Inc. - Danvers MA

H05B 37/02
H05B 41/36

315246, 315247, 315200 R, 315224, 315291, 315307

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.

8587208, Nov 19, 2013

Apr 30, 2012

13/460438

Nitin Kumar - Burlington MA, US
Shashank Bakre - Woburn MA, US
Ayan Choudhury - Danvers MA, US

Osram Sylvania Inc. - Danvers MA

H05B 37/02

315209R, 315224, 315247, 315291, 315307

A multi-strike ballast to ignite an electrodless lamp is disclosed, and includes an inverter circuit, an output voltage detection circuit (OVDC), and an inverter shutdown circuit. The inverter circuit, upon activation, sends an ignition pulse to the electrodeless lamp. The inverter circuit shut downs upon receiving a deactivation signal, and activates upon receiving an activation signal, triggering another ignition pulse. The OVDC detects an output voltage across the lamp. The inverter shutdown circuit includes a multi-strike diac and receives the detected output voltage. The multi-strike diac breaks upon the output voltage reaching a predetermined level. In response, a deactivation signal is sent to the inverter circuit. The multi-strike diac turns off upon the output voltage falling below the predetermined level. In response, an activation signal is sent to the inverter circuit, triggering a further ignition pulse.