Device and method for detecting zero crossing and voltage...

Details Device and method for detecting zero crossing and voltage... Device and method for detecting zero crossing and voltage...

2009-04-22

2011-11-15

Berhane, Adolf (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Zero switching

Reexamination Certificate

active

08058852

ABSTRACT:
A device and method for detecting a zero crossing and voltage amplitude of a commercial power source voltage inputted to an electronic device, from a single pulse signal are disclosed. The apparatus for detecting a zero crossing and a voltage amplitude from a single pulse signal includes: a first calculation unit that compares the commercial power source voltage to a first reference voltage to determine whether or not the commercial power source voltage is smaller than the first reference voltage; a second calculation unit that compares the commercial power source voltage to a second reference voltage smaller than the first reference voltage to determine whether or not the commercial power source voltage is larger than the second reference voltage; a pulse output unit that outputs a pulse if the commercial power source voltage is smaller than the first reference voltage but larger than the second reference voltage; and a detecting unit that detects a zero crossing and a voltage amplitude by analyzing the pulse which has been outputted from the pulse output unit.

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