Patent ID: 6072286
Filing Date: 2000-06-06
Classification: H05B

Abstract:
An electrically isolated, universal auxiliary lighting control circuit suitable for use with different HID lamp types with a wide range of voltages connected in series with an a.c. power source and in parallel with a series connected auxiliary lamp and electromagnetic relay contacts comprising:(a) a current transformer having a primary winding in series with said HID lamp and a secondary winding operable to sense the passage of current through said HID lamp; and(b) a solid state control circuit non-responsive to HID lamp voltage operatively connected to said a.c. power source and to said secondary winding to effect the application of power to said electromagnetic relay to thereby effect the closing of said contacts during the absence of current in said HID lamp, and to prevent the application of power to said electromagnetic relay to thereby effect the opening of said contacts substantially always during the presence of current in said HID lamp.