Abstract: A digital power control device includes a power input terminal, power converter, regulator, power output terminal, feedback voltage detecting unit, feedback voltage encoder, PWM control unit, and a digital PWM output module 8. The feedback voltage encoder includes at least a resistor array, switch array, a resistor, a first comparator, and a second comparator. The feedback voltage encoder will provide a compare signal by processing the comparison between a feedback voltage detected by the feedback voltage detecting unit and a predetermined reference voltage. The PWM control unit will provide a control signal by processing the above compare signal. The digital PWM output module will control the DC converter to produce an analog pulse train with required duty cycle by the control signal of the PWM control unit so that the power output terminal can provide proper power to the electric equipment connected.

Abstract: An LED driver circuit includes a power controller, a voltage regulator, a detecting resistor, a light emitting device, and a voltage detecting circuit. The voltage detecting circuit has a first input end connected to a higher potential end of the detecting resistor, and a second input end thereof is connected to a lower potential end of the detecting resistor. The output end of the voltage detecting circuit is connected to a feedback end of the power controller so as to output a detected voltage signal to the power controller for adjusting the output voltage and supplying a stable and proper value of current to the light emitting device. The voltage detecting circuit is a differential amplifier capable of detecting the voltage difference between the detecting resistor and amplifying it as a feedback to the power controller. Therefore, the output current from the power controller is precisely controlled.

Abstract: An LED driver circuit includes a power controller, a voltage regulator, a detecting resistor, a light emitting device, and a voltage detecting circuit. The voltage detecting circuit has a first input end connected to a higher potential end of the detecting resistor, and a second input end thereof is connected to a lower potential end of the detecting resistor. The output end of the voltage detecting circuit is connected to a feedback end of the power controller so as to output a detected voltage signal to the power controller for adjusting the output voltage and supplying a stable and proper value of current to the light emitting device. The voltage detecting circuit is a differential amplifier capable of detecting the voltage difference between the detecting resistor and amplifying it as a feedback to the power controller. Therefore, the output current from the power controller is precisely controlled.