Patent ID: 8106623

Claim:
A battery charger comprising: a. an inductor circuit that has a first associated reactance, wherein the inductor circuit is comprised of at least two windings; and said at least two windings comprising a first winding and a second winding; b. a capacitor circuit that is coupled in series in between at least said two windings, wherein the capacitor circuit has a second associated reactance, wherein the capacitor circuit and said at least two windings are arranged in a series parallel combination circuit that operates over the on and off time of a complete cycle, wherein the apparatus is arranged that during on-time, the inductor circuit is charged with electro-magnetic power by pushing electrical energy through the first winding and pulling electric energy through the second winding, and that during off-time, the electro-magnetic power in the inductor circuit discharges into a battery and; c. an AC drive circuit that is arranged to selectively charge the inductor circuit, wherein the AC drive is comprised of: a first capacitor, wherein: a first power line node and a second power line node is coupled to the first capacitor; the first capacitor is coupled in parallel with the positive end of the first winding and the negative end of the second winding; the negative end of the first winding and the positive end of the second winding are coupled in parallel with a full-wave rectifier; the full-wave rectifier is coupled in parallel to a second capacitor that is coupled in series with a filter; and the second capacitor is coupled in parallel to a positive terminal of the battery and a negative terminal of the battery, in combination with other elements of the claim.