Patent ID: 7750881

Claim:
A voltage conversion device having a non-linear gain for converting analog voltage provided by an analog voltage source, the voltage conversion device comprising: a gain decision module comprising: an analog to digital (A/D) converter coupled to the analog voltage source, for converting analog voltage provided by the analog voltage source into digital signals; and a gain selector coupled to the A/D converter, for determining a gain according to the digital signals outputted from the A/D converter; a voltage reception module for receiving analog voltage provided by the analog voltage source and outputting the analog voltage after transforming a polarity of the analog voltage according to a polarity-selection signal; a voltage selection module coupled to the voltage reception module and the A/D converter, for outputting a direct-current (DC) voltage selected from a plurality of DC voltages according to an outputted voltage of the voltage reception module, the digital signals outputted from the A/D converter, and the polarity-selection signal; and a voltage output module having a first input end coupled to the gain selector, an output end coupled to the gain selector, and a second input end coupled to the voltage selection module, for outputting an amplified result of the DC voltage outputted from the voltage selection module according to the gain determined by the gain selector.