Power supply selectively providing series and parallel regulation

US5262712A · kind A · utility

Assignee

• Eurosil electronic GmbH · DE

Inventors

• Gerold Klotzig · Unterschleißheim, DE
• Ernst Lingstaedt · Munich, DE

Key dates

• Filing date: Feb 6, 1992
• Grant date: Nov 16, 1993
• Expiry date: Feb 6, 2012

Classification

• Technology area (CPC G): Physics
• CPC primary: G05F1/618
• WIPO field: Control
• WIPO sector: Instruments

Abstract

The invention relates to a method and a circuit array for regulating the supply voltage of a load as may be found, for example, in the form of an integrated circuit in a chip card. An integrated circuit of this type contains a non-volatile memory and the control logic needed to read out the information stored in the non-volatile memory, but with the transmission of both energy and data being wireless, for example inductive. Data is transmitted by suitable modulation of the voltage supply. In order for the reader to clearly evaluate the read-out logic states, it is proposed in accordance with the invention that during output of the first logic level the supply voltage of the load is generated by serial regulation and that during output of the second logic level the terminal voltage of the voltage source is under parallel regulation.