Young H Kang

US Patent:

6552498, Apr 22, 2003

Filed:

Sep 28, 2001

Appl. No.:

09/967191

Inventors:

Himamshu V. Prasad - Rolling Meadows IL
Young G. Kang - Vernon Hills IL
John G. Konopka - Deer Park IL
Warren Moscowitz - Ipswich MA

Assignee:

Osram Sylvania Inc. - Danvers MA

International Classification:

H05B 3702

US Classification:

315244, 315224, 315307

Abstract:

A circuit for controlling current during run-up of a high pressure discharge lamp ( ) comprises a buck converter ( ) for generating a buck current to drive the high pressure discharge lamp and a control circuit ( ) coupled to the buck converter ( ) for varying the duty cycle of the buck current during run-up is disclosed. A method for controlling current in an electronic ballast during run-up of a high pressure discharge lamp comprises steps of detecting ( ) lamp ignition, providing ( ) a buck current to drive the lamp, and varying ( ) the duty cycle of the buck current during run-up to control ( ) the current in the lamp is also disclosed.

US Patent:

7145293, Dec 5, 2006

Filed:

Apr 8, 2005

Appl. No.:

11/101390

Inventors:

Alois Braun - Neuburg, DE
Young G. Kang - Vernon Hills IL, US
Walter Limmer - Munich, DE
Joachim Muhlschlegel - Grobenzell, DE

Assignee:

Patent-Treuhand-Gesellschaft fur Elektrisch Gluhlampen mbH

International Classification:

H05B 41/36
H05B 37/02

US Classification:

315224, 315291

Abstract:

The invention relates to an electronic ballast, to an illumination device including the electronic ballast and an associated high-pressure discharge lamp, and to a corresponding operating method for a high-pressure discharge lamp, in which resonance excitation is used to generate a voltage-increased power for a transfer phase of the lamp Lp after starting.

US Patent:

7432663, Oct 7, 2008

Filed:

Sep 25, 2006

Appl. No.:

11/534926

Inventors:

Young G. Kang - Vernon Hills IL, US
Mustansir H. Kheraluwala - Lake Zurich IL, US
Sivakumar Thangavelu - Round Lake IL, US
Markus Ziegler - Schaumburg IL, US

Assignee:

Osram Sylvania Inc. - Danvers MA

International Classification:

H05B 37/02

US Classification:

315209R, 315209 T, 315246

Abstract:

A circuit () for igniting a high intensity discharge (HID) lamp comprises input terminals (), output terminal (), a charging circuit (R,C), a transformer () having a primary winding () and a secondary winding (), a MOSFET (), and a clamping diode (D). During operation, ignitor circuit () provides a high voltage (V) for igniting an HID lamp. Ignitor circuit () provides an ignition voltage (V) having a peak magnitude that is more predictable and less prone to degradation due to the influences of parasitic components. Additionally, ignitor circuit () may be realized in a manner that is significantly more cost-effective than comparable prior art circuits.

US Patent:

57507244, May 12, 1998

Filed:

Oct 30, 1996

Appl. No.:

8/739912

Inventors:

Young H. Kang - Robbinsville NJ
Gary P. Stack - Ambler PA

Assignee:

American Home Products Corporation - Madison NJ

International Classification:

C07D40500

US Classification:

548454

Abstract:

The compounds of formula I: ##STR1## wherein R. sup. 1, R. sup. 4 and R. sup. 5 are, independently, hydrogen, alkyl, alkoxy, aralkoxy, alkanoyloxy, hydroxy, halo, trifluoromethyl, amino, mono- or di-alkylamino, alkanamido, or alkanesulfonamido; or, R. sup. 1 is defined as above and R. sup. 4 and R. sup. 5, taken together, are ortho substituted methylenedioxy, ethylenedioxy, or propylenedioxy; R. sup. 2 and R. sup. 3 are, independently, hydrogen or alkyl; n is 3 or 4; or pharmaceutically acceptable salts thereof, are useful in the treatment of depression and related disorders.

US Patent:

20160079862, Mar 17, 2016

Filed:

Sep 16, 2014

Appl. No.:

14/487228

Inventors:

- Auburn Hills MI, US
Young G. Kang - Glenview IL, US

International Classification:

H02M 3/335

Abstract:

An output voltage of an LLC resonant converter circuit is received. The received output voltage is analyzed to determine whether the received output voltage is within an acceptable operational range. When the output voltage is not within the acceptable operational range and the operational frequency is below a maximum predetermined frequency, the operational frequency of the LLC resonant converter circuit is adjusted. The adjustment of the operational frequency is effective to change the output voltage to a value that is within the acceptable operational range. When the output voltage is not within the acceptable operational range and the operational frequency is above the maximum predetermined frequency, a phase shift in the LLC resonant converter circuit is adjusted. This adjustment is effective to change the output voltage to a value that is within the acceptable operational range.