Patent ID: 6906498
Filing Date: 2005-06-14
Classification: G01R,H02J

Abstract:
1. Device for the detection of a charging voltage of a plurality of rechargeable batteries, the device comprising: a voltage converter for converting the voltage of the rechargeable batteries into a voltage signal, an analog/digital converter for converting the voltage signal of the voltage converter into a digital signal, and an evaluation and control device for evaluating the digital signal of the analog/digital converter and for controlling the charging process of the at least one rechargeable battery based on the evaluation of the digital signal of the analog/digital converter, wherein the voltage converter comprises an amplifier circuit with a variable gain controlled by at least one control output terminal of the evaluation and control device such that the gain applied for the generation of the voltage signal is adjusted to an input voltage range of the analog/digital converter according to a transfer function, and wherein the evaluation and control device is adapted to define a number of ranges, each range having a gain to adjust the voltage signal of the voltage converter to the input voltage range of the analog/digital converter, the gain being determined by a maximum number of rechargeable batteries the device is capable to charge and a predetermined minimum accuracy for the conversion of the voltage signal of the voltage converter into a digital signal, the evaluation and control device adapted to adjust the transfer function of the amplifier circuit for each of the ranges based on the number of rechargeable batteries to be charged and the predetermined minimum accuracy.