A smoothing device for a power supply is provided comprising a rectifier for rectifying an output of an alternating current power supply and at least a pair of electrolytic capacitors for smoothing an output of said rectifier. The pair of electrolytic capacitors have a non-polarized structure in which...http://www.google.de/patents/US5379181?utm_source=gb-gplus-sharePatent US5379181 - Smoothing device for a power supply
