| 摘要 |
<p>A power supplying system (100) for an electrical appliance device includes an illumination detecting unit (1) for detecting the illumination of environment and outputting a corresponding illumination level signal (S1), an illumination judgment circuit (2) which modulates an adjusted voltage (S2) with the illumination level signal (S1) and outputs it to a pulse width modulating and control circuit (3) and outputs a modulated signal (S3), a current switching unit (4) which is controlled by the modulated signal (S3) and outputs a DC voltage (Vdc) when turned on, a DC-to-AC conversion unit (5) for converting the DC voltage (Vdc) into an AC voltage and supplying it to the electrical appliance device, and a power supply circuit (6) which mainly comprises an electric energy storing unit (62), a DC-to-AC conversion circuit (61), a path switching unit (63) and an electric power abnormality judgment unit (64). The path switching unit (63) has several connection nodes (631, 632, 641) respectively connected with a first AC power supply (ACV1), the DC-to-AC conversion circuit (61), and the electric energy storing unit (62). When the first AC power supply (ACV1) supplies power abnormally, the power needed by the electrical appliance device is supplied by a battery supply (DC+).</p> |
