An electric load driving device including an SMPS, switching mode power supply, the electric load driving device comprising: a rectifying unit configured to rectify a current on an output path of the SMPS; a current limiting unit configured to limit the current output from the rectifying unit to a value equal to or less than a predetermined magnitude so as to prevent ripple current runaway of an electrolytic capacitor (C11, C21, C51) due to thermal runaway of the electrical load; a smoothing unit configured to supply a power to a load by smoothing a current output from the current limiting unit ; and a floating prevention unit configured to be installed between an output terminal of the rectifying unit and an input terminal of the current limiting unit and to prevent an output of the rectifying unit from floating when the current limiting unit is interrupted, wherein the smoothing unit includes the electrolytic capacitor (C11, C21, C51) and the floating prevention unit includes a film capacitor (C12, C22, C52), wherein the current limiting unit is connected in series between the output terminal of the rectifying unit and an input terminal of the smoothing unit, the film capacitor (C12, C22, C52) has one terminal connected to a common junction of the output terminal of the rectifying unit and the input terminal of the current limiting unit , and the other terminal grounded and connected in parallel with the electrolytic capacitor (C11, C21, C51), and wherein the predetermined magnitude is a maximum allowable ripple current of the electrolytic capacitor (C11, C21, C51), as an input to the electrolytic capacitor (C11, C21, C51) of the smoothing unit. a rectifying unit configured to rectify a current on an output path of the SMPS; a current limiting unit configured to limit the current output from the rectifying unit to a value equal to or less than a predetermined magnitude so as to prevent ripple current runaway of an electrolytic capacitor (C11, C21, C51) due to thermal runaway of the electrical load; a smoothing unit configured to supply a power to a load by smoothing a current output from the current limiting unit ; and a floating prevention unit configured to be installed between an output terminal of the rectifying unit and an input terminal of the current limiting unit and to prevent an output of the rectifying unit from floating when the current limiting unit is interrupted, wherein the smoothing unit includes the electrolytic capacitor (C11, C21, C51) and the floating prevention unit includes a film capacitor (C12, C22, C52), wherein the current limiting unit is connected in series between the output terminal of the rectifying unit and an input terminal of the smoothing unit, the film capacitor (C12, C22, C52) has one terminal connected to a common junction of the output terminal of the rectifying unit and the input terminal of the current limiting unit , and the other terminal grounded and connected in parallel with the electrolytic capacitor (C11, C21, C51), and wherein the predetermined magnitude is a maximum allowable ripple current of the electrolytic capacitor (C11, C21, C51), as an input to the electrolytic capacitor (C11, C21, C51) of the smoothing unit. <EOS>