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Therefore, the loss factor (df) of electrolytic capacitors is also known as loss angle tangent in many technical literatures. The main voltage indexes of aluminum electrolytic capacitor are rated dc voltage, rated surge voltage, instantaneous overvoltage and reverse voltage, and dc voltage, vr voltage, dc voltage vr is the continuous operating voltage of capacitor in the range of rated temperature. It includes the sum of DC voltage, pulsating voltage or continuous pulse voltage between two electrodes of a capacitor. Generally, the rated voltage of tantalum capacitors is marked on the surface of capacitors. Usually rated voltage ≤ 100v t491b107m004at is "low voltage" tantalum capacitor, and rated voltage ≥ 150v is "high voltage" capacitor [1].