| 摘要 |
A high efficiency, electronic ballast is taught for high intensity discharge (HID) lamps in wattages of 50W to 1000W or greater. The ballast is powered by either 240 or 115 volts, 50-60 hertz, of alternating current. The input alternating current is rectified so that 320 - 340 VDC powers the lamp. The ballast maintains constant wattage to the lamp and constant line wattage. The ballast also has an undervoltage protection circuit, a voltage spike protector, and a radio frequency interference (RFI) filter. |
