Patent ID: 7365528
Filing Date: 2008-04-29
Classification: G01R

Abstract:
1. A method of voltage measurement comprising the steps of: charging a capacitor with a voltage supply to be measured about voltage; converting a voltage between terminals of the capacitor charged or an equivalent voltage thereof from analog to digital value with an analog/digital (A/D) converter; evaluating a measured voltage value from the digital value; and calculating the voltage of the voltage supply from the measured value, wherein when the voltage between the terminals of the capacitor or the equivalent voltage is higher than a full scale of the A/D converter, the voltage is separated into a first voltage region corresponding to the full scale of the A/D converter and a second voltage region corresponding to a voltage exceeding the full scale of the A/D converter, and wherein voltages of the first and second voltage regions are converted from analog to digital with respective A/D converters.