Patent ID: 9030112
Filing Date: 2015-05-12
Classification: H05B

Abstract:
1. An illumination system comprising: a first light emitting component; a signal receiver device configured to, in response to a coupling signal that includes control information corresponding to said first light emitting component, generate a receiver-side signal frame based on the control information of the coupling signal, the receiver-side signal frame including a first control code portion corresponding to said first light emitting component; and a driving device including wherein said first current providing unit includes a first pulse-width modulation (PWM) signal generator connected electrically to said code extracting unit for receiving the first control code portion from said code extracting unit, and operable to generate a first PWM signal having a duty cycle dependent on the first control code portion received by said first PWM signal generator, the magnitude of the first driving current being dependent on the duty cycle of the first PWM signal; wherein said first current providing unit further includes: a first buffer connected electrically to said first PWM signal generator for receiving the first PWM signal from said first PWM signal generator, and operable to perform signal amplification upon the first PWM signal received by said first buffer so as to generate a first amplified PWM signal, which has a duty cycle corresponding to that of the first PWM signal; and a first current control circuit including: an operational amplifier having a first input terminal connected electrically to said first buffer for receiving the first amplified PWM signal from said first buffer, a second input terminal, and an output terminal; a resistor; and a transistor having a first terminal connected electrically to said first light emitting component, a second terminal connected electrically to ground via said resistor and connected electrically to said second input terminal of said operational amplifier, and a control terminal connected electrically to said output terminal of said operational amplifier, said operational amplifier controlling switching of said transistor to control provision of the first driving current through said first light emitting component according to the duty cycle of the first amplified PWM signal received by said operational amplifier, the magnitude of the first driving current being dependent on the duty cycle of the first amplified PWM signal.