Electric lamp and discharge devices: systems – Plural load device systems
Reexamination Certificate
2006-10-24
2006-10-24
Chen, Shih-Chao (Department: 2821)
Electric lamp and discharge devices: systems
Plural load device systems
C315S247000
Reexamination Certificate
active
07126290
ABSTRACT:
The light output intensity of incandescent lamps and LEDs connected to a common lamp power bus are controlled using a composite waveform having two power components: a pulse-width modulated (PWM) component and a direct current DC component. The DC component is maintained below the turn-on voltage for the LEDs. The PWM component controls the light intensity of the LEDs; and the DC component is calculated as a quadrature power series, taking into account that the PWM component contributes to the light intensity of the incandescent lamps. The frequency and slew rate of the PWM component are selected to minimize EMI. A small steady state power component is provided to keep the LEDs slightly turned on to minimize EMI.
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A Minh Dieu
Chen Shih-Chao
Linden Gerald E.
Radiant Power Corp.
Stauffer Dwight A.
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