The present invention provides an APLC which has improved common-mode disturbance rejection capability when compared with similarly-sized devices constructed according to current teachings. The need for an isolation transformer is, in many cases, eliminated by the invention. The invention alters the...http://www.google.com/patents/US5319535?utm_source=gb-gplus-sharePatent US5319535 - Active power line conditioner having capability for rejection of common-mode disturbances
