Patent ID: 9261540
Filing Date: 2016-02-16
CPC Classification: G01K,G01R

Claim Text:
1. A device for measuring voltage of a power supply, the device comprising: a resistor; a capacitor having one end connected with the resistor and another end connected to ground; and a control unit connected with the power supply, the control unit including a comparator connected with the capacitor, a reference power supply connected with the comparator, a timer, and a computing unit; wherein the reference power supply includes an absolute reference power supply and a relative reference power supply; wherein the control unit is operable for controlling the comparator to connect to the absolute reference power supply or the relative reference power supply, such that: wherein the computing unit is operable for calculating the voltage of the power supply based on the first time interval, the second time interval, and the voltage of the absolute reference power supply.