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.

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.

Abstract: A circuit (300) for igniting a high intensity discharge (HID) lamp comprises input terminals (302,304), output terminal (306,308), a charging circuit (RIGN,CIGN), a transformer (320) having a primary winding (322) and a secondary winding (324), a MOSFET (340), and a clamping diode (DCLAMP). During operation, ignitor circuit (300) provides a high voltage (VIGN) for igniting an HID lamp. Ignitor circuit (300) provides an ignition voltage (VIGN) having a peak magnitude that is more predictable and less prone to degradation due to the influences of parasitic components. Additionally, ignitor circuit (300) may be realized in a manner that is significantly more cost-effective than comparable prior art circuits.

Abstract: A circuit (300) for igniting a high intensity discharge (HID) lamp comprises input terminals (302,304), output terminal (306,308), a charging circuit (RIGN,CIGN), a transformer (320) having a primary winding (322) and a secondary winding (324), a MOSFET (340), and a clamping diode (DCLAMP). During operation, ignitor circuit (300) provides a high voltage (VIGN) for igniting an HID lamp. Ignitor circuit (300) provides an ignition voltage (VIGN) having a peak magnitude that is more predictable and less prone to degradation due to the influences of parasitic components. Additionally, ignitor circuit (300) may be realized in a manner that is significantly more cost-effective than comparable prior art circuits.

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.

Abstract: A circuit for controlling current during run-up of a high pressure discharge lamp (140) comprises a buck converter (120) for generating a buck current to drive the high pressure discharge lamp and a control circuit (202) coupled to the buck converter (120) 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 (501) lamp ignition, providing (502) a buck current to drive the lamp, and varying (504) the duty cycle of the buck current during run-up to control (506) the current in the lamp is also disclosed.

Abstract: A circuit for controlling current during run-up of a high pressure discharge lamp (140) comprises a buck converter (120) for generating a buck current to drive the high pressure discharge lamp and a control circuit (202) coupled to the buck converter (120) 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 (501) lamp ignition, providing (502) a buck current to drive the lamp, and varying (504) the duty cycle of the buck current during run-up to control (506) the current in the lamp is also disclosed.