PARALLEL-TYPE LED LIGHTING DEVICE

摘要

The present disclosure provides an AC-direct-type LED-lighting device including compensation circuit for AC input compensation, including a compensation inductor and first compensation capacitor parallelly connected to one terminal of AC input and a second compensation capacitor connected in series; rectifying unit for rectifying output from second compensation capacitor terminals to obtain direct current; and LED array driven by the rectifying unit output, wherein capacities of the first and second compensation capacitors and the compensation inductor and LED array output voltage are determined to cause 0.9 or larger cosine value of a phase, with respect to the AC input voltage, of resulting current obtained by dividing AC input voltage by sum of (i) parallel value of an equivalent impedance Re of the rectifying unit and LED array and an impedance of the second compensation capacitor and (ii) parallel value of impedances of the compensation inductor and first compensation capacitor.

主权项

1. An AC-direct-type LED lighting device, comprising:
a compensation circuit including a compensation inductor and a first compensation capacitor parallelly connected to one terminal of an AC input and a second compensation capacitor connected in series to the parallelly-connected compensation inductor and first compensation capacitor, and configured to compensate the AC input; a rectifying unit configured to rectify an output from terminals of the second compensation capacitor to obtain a direct current; and an LED array configured to be driven by an output of the rectifying unit, wherein capacities of the first compensation capacitor, the second compensation capacitor and the compensation inductor, and an output voltage of the LED array are determined to cause 0.9 or larger cosine value of a phase, with respect to a voltage of the AC input, of a resulting current, obtained by dividing the voltage of the AC input by a sum of (i) a parallel value of an equivalent impedance Re of the rectifying unit and the LED array and an impedance of the second compensation capacitor and (ii) a parallel value of an impedance of the compensation inductor and an impedance of the first compensation capacitor.