Patent ID: 9588153
Date: 2017-03-07
CPC Classifications: G01R

Claim:
1. An apparatus for detecting over voltage and/or under voltage in an electronic/electrical device, the apparatus comprising: a reference voltage receiving unit configured to receive a reference voltage; a gradient measuring unit configured to measure a gradient value at a point in a waveform of the reference voltage; a pulse conversion unit configured to convert the gradient value obtained from the gradient measuring unit into a first pulse width corresponding to the gradient value; an electrical power receiving unit configured to receive an input voltage from an external power source; a voltage detection unit configured to compare the first pulse width with a second pulse width corresponding to the input voltage to detect an over voltage condition or an under voltage condition, wherein information about a third pulse width corresponding to a high voltage and a fourth pulse width corresponding to a low voltage is accessible to the voltage detection unit, and wherein the voltage detection unit is further configured to determine that the input voltage is in a normal range for the high voltage if the second pulse width is larger than the first pulse width but smaller than the third pulse width, and is also configured to determine that the input voltage is in a normal range for the low voltage if the second pulse width of the input voltage is smaller than the first pulse width but larger than the fourth pulse width.