Now showing items 1-3 of 3
Discharge lamp lighting control device
(United States Patent and Trademark Office, 2008-06-24)
A discharge lamp lighting control device (100) having a DC power converter, a power factor improving power converter (1), a polarity reversing circuit (2), a starter circuit (3), and a controller (4). The power factor ...
Discharge lamp driving circuit having resonant circuit defining two resonance modes
(United States Patent and Trademark Office, 1999-06-22)
An improved discharge lamp driving circuit of a charge-pump type capable of suppressing a ripple in an envelop of a lamp current at the time of dimming the lamp or at a low environmental temperature. The circuit includes ...
Power supply for supplying AC output power
(United States Patent and Trademark Office, 2000-05-02)
High voltage stress on the semiconductor devices at light load conditions, high total harmonic distortion (THD) of the line current, and poor crest factor (CF) of lamp current of ''charge pump'' electronic ballast circuits ...