Patent ID: 7817148

Claim:
A voltage generating system comprising: a first voltage generating device for generating a plurality of voltages between a maximum voltage and a minimum voltage as a first set of voltages; and a second voltage generating device for generating a plurality of voltages between the maximum voltage and the minimum voltage as a second set of voltages, the second set of voltages being different from the first set of voltages, wherein the first voltage generating device generates the maximum voltage, and supplies the first set of voltages and the maximum voltage to the second voltage generating device, the second voltage generating device generates the minimum voltage, and supplies the second set of voltages and the minimum voltage to the first voltage generating device, and the first and second voltage generating devices each select a voltage from the first and second sets of voltages, and output the selected voltage, wherein the first voltage generating device comprises: a first voltage generating section for generating the maximum voltage; a first intermediate voltage generating section for, based on the maximum voltage and the minimum voltage, generating as the first set of voltages a plurality of voltages which are lower than or equal to the maximum voltage and are higher than a voltage at a middle point between the maximum voltage and the minimum voltage; and a first voltage selecting section for selecting a voltage from the first and second sets of voltages and outputting the selected voltage, and the second voltage generating device comprises: a second voltage generating section for generating the minimum voltage; a second intermediate voltage generating section for, based on the maximum voltage and the minimum voltage, generating as the second set of voltages a plurality of voltages which are higher than or equal to the minimum voltage and are lower than or equal to the voltage at the middle point; and a second voltage selecting section for selecting a voltage from the first and second sets of voltages and outputting the selected voltage.