Method for reading data from a document, reader, document and electronic system

摘要

The invention relates to a method for reading data (120) from a document (104) using a reader (102), wherein the reader forms the primary side of a transformer (110), wherein the document has an electronic memory (118) for storing the data, processor means (114) for reading the data from the memory and at least one electrical load (128, 130, 132) which can be actuated by the processor means, wherein the document forms the secondary side of the transformer, and wherein the processor means and the at least one load are coupled to the secondary side for the purpose of supplying power, having the following steps: a primary-side voltage (U) is applied to the primary side for the purpose of injecting power into the secondary side, the at least one load is actuated by the processor means, as a result of which a time-variant secondary-side load is formed which prompts the primary-side voltage to undergo modulation, the modulation of the primary-side voltage is evaluated by the reader in order to execute read access for the purpose of reading the data on the basis of a result of the evaluation.