DC coupled electronic ballast with a larger DC and smaller AC si

Details DC coupled electronic ballast with a larger DC and smaller AC si DC coupled electronic ballast with a larger DC and smaller AC si

1994-07-13

1996-12-03

Pascal, Robert

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315209R, 315DIG7, H05B 3702

Patent

active

055811612

ABSTRACT:
A low cost, high efficiency electronic larger DC/smaller AC ballast for fluorescent lamps and other gas discharge devices uses fast react feedback and constant power sources to power a fluorescent lamp at a stable working point and to reduce the accuracy requirements of related components. An input-side chopper regulator provides a DC supply voltage. A voltage multiplier in combination with the input-side chopper smoothly and reliably starts the lamp, providing high voltage at low current during startup, and minimal loading thereafter. A second constant power source drives the bulb via an output side chopper coupled to a storage capacitor and inductor, maintaining larger DC/smaller AC operation while reducing harmonics. The operational voltage applied to the load has a large DC component and a smaller AC component, thereby reducing electrophoresis effects. The constant power sources can be adjustable manually or automatically, for dimming control.

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