Abstract: A digital AC/DC power converter comprises an active PFC module, a single switch module having a single switch, a power output module having a transformer, a digital control module having a microcontroller, and a rectifying and filtering module having a full-bridge rectifier, an EMI filter, and a capacitor that is less than 1 ?F. The single switch is electrically connected to the active PFC module, and a primary winding of the transformer is electrically connected to the active PFC module. The microcontroller provides a PWM signal to control the switching state of the single switch, so that the active PFC module transforms AC frequency from less than 300 Hz into over 30,000 Hz and outputs a rectified AC voltage waveform. The EMI filter blocks high electromagnetic frequencies and the capacitor smooths a variation in the rectified voltage waveform and output the smoothed rectified voltage waveform to the active PFC module.

Abstract: A digital AC/DC power converter comprises an active PFC module, a single switch module having a single switch, a power output module having a transformer, and a digital control module having a microcontroller. The single switch is electrically connected to the active PFC module, and a primary winding of the transformer is electrically connected to the active PFC module. Moreover, the microcontroller provides a PWM signal to control the switching state of the single switch, so that the active PFC module transforms AC frequency from no more than 300 Hz into at least 30,000 Hz and outputs a rectified AC output voltage waveform to improve power factor.

Abstract: The invention provides an LED lighting device having a plurality of LED modules. Each LED module includes a housing structure, a plurality of LEDs disposed on the housing structure and a power converter that provides power to the LEDs. Each power converter of the LED modules operates independently. The LED lighting device of the present invention is more difficult to fail and may effectively reduce maintenance costs.