Patent ID: 6137238
Filing Date: 2000-10-24
Classification: H05B

Abstract:
A high-efficiency self-regulated electronic ballast with a single characteristic curve for operating high-pressure sodium-vapor lamps, comprising:an alternating-current to direct-current converter circuit with overcurrent and overvoltage protective devices;a voltage regulator circuit, which corrects the power factor and reduces harmonic distortion;a direct-current to high-frequency alternating-current converter circuit;a reducing autotransformer circuit with a current limiter inductor and ignitor,a photocontrolled switching circuit including an integrated photocell;wherein said high-efficiency self-regulated electronic ballast is arranged to supply a regulated high-frequency alternating voltage to a limiter inductor-lamp unit (L2), which thereby causes the ballast to have a single ballast characteristic curve; andwherein said ballast is fixed to operate the lamp within a frequency range of 10 kHz to 20 kHz, in order to produce a maximum luminous flux emission.