Patent ID: 7312587
Filing Date: 2007-12-25
Classification: H05B,Y02B

Abstract:
1. A control device for a high intensity discharge bulb, in which by applying drive pulses to said high intensity discharge bulb which is mounted on a vehicle a predetermined target electric power is supplied to said high intensity discharge bulb, said device comprising: first pulse generating means for outputting a first number of pulses per unit time to said high intensity discharge bulb during a first period; second pulse generating means for outputting a second number of pulses per unit time to said high intensity discharge bulb during a second period, said second number of pulses being different from said first number of pulses; drive voltage detecting means for detecting a drive voltage of said high intensity discharge bulb; assumed electric power setting means for setting an assumed drive current for said drive voltage detected by said drive voltage detecting means and setting an assumed supply electric power based on said assumed drive current and said drive voltage detected by said drive voltage detecting means; error calculating means for determining an error between said assumed supply electric power set by said assumed electric power setting means and said target electric power; and correcting means for determining a number of pulses output from said first pulse generating means and a number of pulses output from second pulse generating means so as to minimize said error determined by said error calculating means.