| 摘要 |
The present invention provides a high frequency electronic ballast with rail voltage switching which adjusts the DC rail voltage output ( 208 ) to account for different voltages of mains power ( 210 ), improving efficiency. The rail voltage switching comprises a mains power supply ( 200 ) providing mains power ( 210 ) and a mains voltage signal ( 212 ); a ballast microcontroller ( 206 ) responsive to the mains voltage signal ( 212 ) and generating a power factor correction (PFC) voltage signal ( 214 ); and a converter ( 204 ) operably connected to the mains power supply ( 200 ) and responsive to the PFC voltage signal ( 214 ) to generate a DC rail voltage output ( 208 ). For an embodiment using power factor control, the converter ( 204 ) comprises a coil ( 218 ), power factor correction ( 224 ), a switch ( 220 ), and a rectifier ( 222 ).
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