Apparatus for calculating an effective voltage

Details Apparatus for calculating an effective voltage Apparatus for calculating an effective voltage

2006-01-10

2006-01-10

Nghiem, Michael (Department: 2863)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Electrical signal parameter measurement system

C322S028000, C324S525000

Reexamination Certificate

active

06985821

ABSTRACT:
An apparatus for calculating an effective voltage is provided, which includes a voltage reducer, an analogue to digital converter, a first detector, a second detector and a calculator. The voltage reducer steps down instantaneous output voltages of a generator. The analogue to digital converter converts each analogue signal of the instantaneous output voltages into a digital signal. The first detector detects a first signal of digitized instantaneous output voltage. The second detector detects a second signal, which differs in terms of phase by 120 deg. from the first signal. The calculator calculates an effective voltage according to the first and second signals, by executing a calculation with an expression: E={2(Va2+VaVb+Vb2)/3}1/2, where E represents the effective voltage, Vathe first signal of instantaneous output voltage and Vbthe second signal, respectively.

REFERENCES:
patent: 2003/0112015 (2003-06-01), Takakamo et al.
patent: 2005/0104561 (2005-05-01), Kawabata
patent: 10-010163 (1998-01-01), None

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