SIGNAL CONVERSION DEVICE OF A WATT HOUR METER SYSTEM, A SIGNAL CONVERSION METHOD OF A WATT HOUR METER SYSTEM AND A WATT HOUR METER SYSTEM CAPABLE OF REDUCING POWER CONSUMPTION THROUGH UP-CONVERTING OF CURRENT AND VOLTAGE SIGNALS

摘要

PURPOSE: A signal conversion device of a watt hour meter system, a signal conversion method of a watt hour meter system and a watt hour meter system are provided to convert two or six voltage and current signals in a single phase or three-phase power system through one analog-digital converter by up-converting a frequency of current and voltage signal and to reduce power consumption and a size of system.;CONSTITUTION: A frequency shift unit(10) shifts a frequency of at least one signal by a shift frequency to make detected current and voltage signals have different frequency range. A signal combination unit(30) combines current and voltage signals having different frequency range in one signal. An analog-digital conversion unit(50) converts the analog signal combined to be one signal into a digital signal.;COPYRIGHT KIPO 2013