Osram Sylvania Inc.

Patent-Treuhand-Gesellschaft Fur Elektrisch Gluhlampen Mbh

Osram Gmbh

Young G Kang

John G Konopka

Mustansir Kheraluwala

Markus Ziegler

Walter Limmer

Joachim Mühlschlegel

Sivakumar Thangavelu

Alois Braun

Himamshu V Prasad

Warren Moscowitz

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.

Circuit for igniting a high intensity discharge lamp

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.

Electronic ballast having resonance excitation for generating a transfer voltage

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.

Method and circuit for controlling current in a high pressure discharge lamp

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Vernon Hills, IL, United States of America

Young G Kang