专利汇可以提供Reactive-power meter专利检索,专利查询,专利分析的服务。并且PURPOSE: To enable a reactive power to be measured by each signal value regardless of frequency fluctuation of an AC voltage signal to be input along with the AC current signal.
CONSTITUTION: A phase of an AC voltage system which is input along with an AC current signal is shifted by 90 degrees by a 90-degree phase shifter 1 and then input to an analog switch 9, this analog switch 9 is turned on by a pulse signal with a fixed time width which is output from a counter 8 for allowing a 90-degree phase shifter output for a fixed amount of time to be input to a mark space modulator 2, a pulse train signal with a pulse width corresponding to the input signal level is input to an amplitude modulator 3 as a modulation signal, and an AC current signal is modulated, thus enabling a reactive power data to be generated. An output does not depend on a frequency of the input signal and a effect for improving a measurement accuracy of the reactive power meter can be obtained.
COPYRIGHT: (C)1992,JPO&Japio,下面是Reactive-power meter专利的具体信息内容。
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