Patents by Inventor Vipin Madhani
Vipin Madhani has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7686486Abstract: An LED lamp (10) has a housing (12) with an interior wall (14) defining a cavity (16). An LED light source (26) is positioned in the cavity (16) and project light in a forward direction. A reflector (28) having a reflective surface (30), a forward opening (32) and a rear opening (34) surrounds the light source (26) and a complex lens (38) closes the forward opening. The lens (38) comprises a first optical refractive element (40) arranged around a peripheral edge (42) and a second optical refractive element (44) centrally located on the lens (38); the first optical refractive element (40) including a plurality of flute lenses (40a) and the second optical refractive element (44) comprising a concavo-convex lens (44a).Type: GrantFiled: January 30, 2008Date of Patent: March 30, 2010Assignee: OSRAM SYLVANIA Inc.Inventors: Thomas Tessnow, Mike Tucker, Vipin Madhani, Peter Frey
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Publication number: 20090003009Abstract: An LED lamp (10) has a housing (12) with an interior wall (14) defining a cavity (16). An LED light source (26) is positioned in the cavity (16) and project light in a forward direction. A reflector (28) having a reflective surface (30), a forward opening (32) and a rear opening (34) surrounds the light source (26) and a complex lens (38) closes the forward opening. The lens (38) comprises a first optical refractive element (40) arranged around a peripheral edge (42) and a second optical refractive element (44) centrally located on the lens (38); the first optical refractive element (40) including a plurality of flute lenses (40a) and the second optical refractive element (44) comprising a concavo-convex lens (44a).Type: ApplicationFiled: January 30, 2008Publication date: January 1, 2009Inventors: Thomas Tessnow, Mike Tucker, Vipin Madhani, Peter Frey
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Patent number: 7230349Abstract: A high intensity discharge (HID) assembly comprises ballast circuits which includes a micro-controller, and an HID headlamp. In order to deter theft of the HID assembly from a vehicle, the micro-controller communicates with a vehicle computer, checks the VIN of the vehicle, and if the micro-controller does not recognize the VIN, causes the HID headlamp to operate in a flickering power output mode. The ballast circuits include a power control circuit, a lamp current regulator, a 400v regulator, a current sense circuit, a turn-on synchronization circuit, a shut down circuit, and a pulse width modulator.Type: GrantFiled: October 12, 2005Date of Patent: June 12, 2007Inventors: Andrew O. Johnsen, Vipin Madhani, Guy P. Bouchard
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Patent number: 7211965Abstract: A circuit for operating a high intensity discharge (HID) lamp includes an H-bridge connected between a common terminal and a power line, and a control circuit connected to the H-bridge. The control circuit includes a transformer having a primary winding connected between the common terminal and a power terminal and a secondary winding connected between the common terminal and the power line, and a current sense resistor connected in series between the secondary winding and the common terminal. The HID lamp is connected to the common terminal and to the second winding so as sense a current across the current sense resistor.Type: GrantFiled: November 10, 2004Date of Patent: May 1, 2007Assignee: Osram Sylvania Inc.Inventors: Andrew O. Johnsen, Bernhard Ertl, Guy P. Bouchard, Vipin Madhani
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Patent number: 7059748Abstract: An LED light source (10) has a housing (12) with a base (14). A central heat conductor (18) is centrally located within the hollow core (16) and is formed of a suitable heat-conducting material, such as copper. A cap (36) is fitted over a second printed circuit board (24), and a heat sink (38) is attached to the base (14) and in thermal contact with a first printed circuit board (20). The heat sink (38) has a bottom (40) with an upstanding side wall (42) terminating in a plurality of fingers (44), the fingers (44) being formed to overlie an upper surface (46) of the base (14). The heat sink (38) is preferably formed from black-anodized aluminum.Type: GrantFiled: May 3, 2004Date of Patent: June 13, 2006Assignee: OSRAM Sylvania Inc.Inventors: Charles M. Coushaine, Kim Albright, Thomas Tessnow, Vipin Madhani
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Publication number: 20060097661Abstract: A high intensity discharge (HID) assembly comprises ballast circuits which includes a micro-controller, and an HID headlamp. In order to deter theft of the HID assembly from a vehicle, the micro-controller communicates with a vehicle computer, checks the VIN of the vehicle, and if the micro-controller does not recognize the VIN, causes the HID headlamp to operate in a flickering power output mode. The ballast circuits include a power control circuit, a lamp current regulator, a 400v regulator, a current sense circuit, a turn-on synchronization circuit, a shut down circuit, and a pulse width modulator.Type: ApplicationFiled: October 12, 2005Publication date: May 11, 2006Inventors: Andrew Johnsen, Vipin Madhani, Guy Bouchard
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Patent number: 7042165Abstract: A first vehicle lamp driver circuit for a light emitting diode (LED) array, the LED array having a first string of four LEDs in series and a second string of four LEDs in series. A first LED driver drives the first LED string and a second LED driver drives the second LED string. In a STOP mode of operation, the current to both LED strings is controlled by the LED driver in series with the LED string. In a TAIL mode of operation, the current is provided to only one LED string via a series connected diode and resistor. When there is reduced input voltage, operation of the LED strings is provided by switching circuits that short-out one LED in each LED string. A second vehicle lamp driver circuit comprises a first LED string and a second LED string in series with a control switch having a feedback circuit for maintaining constant current regulation to control the sum of the current in each LED string and reduce switching noise.Type: GrantFiled: August 26, 2004Date of Patent: May 9, 2006Assignee: Osram Sylvania Inc.Inventors: Vipin Madhani, Andrew O. Johnsen
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Publication number: 20050243559Abstract: An LED light source (10) has a housing (12) with a base (14). A central heat conductor (18) is centrally located within the hollow core (16) and is formed of a suitable heat-conducting material, such as copper. A cap (36) is fitted over a second printed circuit board (24), and a heat sink (38) is attached to the base (14) and in thermal contact with a first printed circuit board (20). The heat sink (38) has a bottom (40) with an upstanding side wall (42) terminating in a plurality of fingers (44), the fingers (44) being formed to overlie an upper surface (46) of the base (14). The heat sink (38) is preferably formed from black-anodized aluminum.Type: ApplicationFiled: May 3, 2004Publication date: November 3, 2005Inventors: Charles Coushaine, Kim Albright, Thomas Tessnow, Vipin Madhani
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Publication number: 20050057179Abstract: A first vehicle lamp driver circuit for a light emitting diode (LED) array, the LED array having a first string of four LEDs in series and a second string of four LEDs in series. A first LED driver drives the first LED string and a second LED driver drives the second LED string. In a STOP mode of operation, the current to both LED strings is controlled by the LED driver in series with the LED string. In a TAIL mode of operation, the current is provided to only one LED string via a series connected diode and resistor. When there is reduced input voltage, operation of the LED strings is provided by switching circuits that short-out one LED in each LED string. A second vehicle lamp driver circuit comprises a first LED string and a second LED string in series with a control switch having a feedback circuit for maintaining constant current regulation to control the sum of the current in each LED string and reduce switching noise.Type: ApplicationFiled: August 26, 2004Publication date: March 17, 2005Applicant: OSRAM SYLVANIA INC.Inventors: Vipin Madhani, Andrew Johnsen
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Publication number: 20050040771Abstract: A circuit for operating a high intensity discharge (HID) lamp includes an H-bridge connected between a common terminal and a power line, and a control circuit connected to the H-bridge. The control circuit includes a transformer having a primary winding connected between the common terminal and a power terminal and a secondary winding connected between the common terminal and the power line, and a current sense resistor connected in series between the secondary winding and the common terminal. The HID lamp is connected to the common terminal and to the second winding so as sense a current across the current sense resistor.Type: ApplicationFiled: November 10, 2004Publication date: February 24, 2005Applicant: OSRAM SYLVANIA INC.Inventors: Andrew Johnsen, Bernhard Ertl, Guy Bouchard, Vipin Madhani