Power source input device for both ac and dc power sources

A power source input device for both alternating current (AC) and direct current (DC) power sources, comprising:

• a first power source input unit that is provided at a power source input terminal of an electric power device to convert an AC or DC commercial power source selectively input from the outside of the first power source input unit into a DC driving power source and supply the converted DC driving power source to an accessory device;
• and
• a second power source input unit that is provided in the accessory device to supply the DC driving power source supplied from the first power source input unit to at least one load,
• wherein the first power source input unit comprises:
• a power source input unit that receives the AC or DC commercial power source;
• a filter circuit unit that filters the AC or DC commercial power source;
• a rectification circuit unit that rectifies the filtered AC or DC commercial power source;
• an amplification circuit unit that amplifies a voltage of the rectified AC or DC commercial power source;
• a smoothing capacitor that smoothes the amplified AC or DC commercial power source so that a DC driving power source is output;
• an output converter that supplies the DC driving power source to a self load,
• a sensing circuit unit that senses the AC or DC commercial power source rectified by the rectification circuit unit to output whether the rectified commercial power source is an AC commercial power source or a DC commercial power source;
• and
• a conversion setting unit that applies a switching signal to the amplification circuit unit so that the amplification circuit unit performs a boost converting operation when the AC commercial power source is sensed, and that turns off the switching signal so that the amplification circuit unit does not perform the boost converting operation when the DC commercial power source is sensed.