Bridge rectifiers revisited:

This article discusses an extension of the well-known single-phase, full-wave bridge rectifier to provide a high-efficiency voltage multiplier. The extension is based on a circuit developed by Dip.Eng. Th. Gisper, a Swiss engineer, who described his design in a paper entitled HF-DC-Converter-Schaltung in der passiven Telemetrie (Eidgenössische Technische Hochschule-ETHZürich 26 February 1988).