G - Physics – 01 – R
Patent
G - Physics
01
R
324/59
G01R 19/00 (2006.01) G01R 19/04 (2006.01) G01R 19/10 (2006.01) G01R 31/34 (2006.01) H02H 3/46 (2006.01)
Patent
CA 1175487
ABSTRACT OF THE DISCLOSURE: A device for determining the AC line voltage amplitude/frequency characteristic of an AC network, comprising a circuit for integrating an input signal, having a certain voltage amplitude and frequency, and re- presentative of the line voltage and frequency of the AC network. The integrating circuit repeatedly integrates the input signal to obtain an integrated signal proportional to the maximum voltage amplitude of the input signal and representative of the voltage amplitude/frequency ratio of this input signal. The device also comprises a circuit responsive to the input signal for repeatedly generating control signals defining an initial and end points of the integration of this input signal as a function of its frequency such that a phase angle between the initial and end points, and a phase angle between each initial point and an immediately preceding zero passage of the input signal, are at least substantially constant. An electronic switch is responsive to the control signals for controlling the respective initiation and termination of the integra- ting of the integrating circuit to provide integration intervals between respective initial points and successive end points. An output signal of the device is provided by a circuit responsive to the integrated signal, which output signal is by itself representative of the voltage amplitude/ frequency ratio characteristic of the AC line.
350515
Asea Aktiebolag
Robic Robic & Associes/associates
LandOfFree
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