초록 ▼

An apparatus (20) to control a high intensity discharge lamp (24) by generating fuzzy logic transfer functions (360, 362) with a software package (368). The fuzzy logic transfer functions (360, 362) are applied by a controller (210) for controlling the operation of the lamp (24). The first fuzzy log

An apparatus (20) to control a high intensity discharge lamp (24) by generating fuzzy logic transfer functions (360, 362) with a software package (368). The fuzzy logic transfer functions (360, 362) are applied by a controller (210) for controlling the operation of the lamp (24). The first fuzzy logic transfer function (360) includes both of a lamp ignition membership function and a lamp steady state membership function. The second fuzzy logic transfer function (362) includes a first current error magnitude membership function and a second different current error magnitude membership function. Both of the first and second membership functions functionally related to both of the error current value and a PWM count change value. A current sense resistor (256) provides a signal indicative of lamp current to the controller (210). An internal real time clock (RTC) in the controller (210) measures the amount of time that the lamp (24) is operating and provides a real time signal for use in the controller (210). The controller (210) applies the first and second fuzzy logic transfer functions (360, 362) to control the operation of the lamp (24). The controller (210) provides a control signal on the output (230) in response to both of the signal from the current sense resistor (256) and the signal from the internal timer (RTC) in accordance with both the first and the second fuzzy logic transfer functions (360, 362).

대표청구항 ▼

[ Having thus described the invention, it is now claimed:] [1.] An apparatus for controlling a high intensity discharge lamp, said apparatus comprising:generating means adapted for generating a fuzzy logic transfer function for controlling the operation of an associated lamp;sensing means for sensin

[ Having thus described the invention, it is now claimed:] [1.] An apparatus for controlling a high intensity discharge lamp, said apparatus comprising:generating means adapted for generating a fuzzy logic transfer function for controlling the operation of an associated lamp;sensing means for sensing a lamp current and providing a signal indicative of lamp current;timing means for measuring lamp operation time, including means for generating a real time signal indicative thereof; andcontrol means adapted for applying the fuzzy logic transfer function to control the operation of the associated lamp, the control means including means adapted for providing a control signal in response to both of the signal from the sensing means and the signal from the timing means in accordance with the fuzzy logic transfer function.