Voltage disturbance and harmonics monitor

Details Voltage disturbance and harmonics monitor Voltage disturbance and harmonics monitor

2011-05-31

2011-05-31

Luu, An T (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Rectangular or pulse waveform amplitude control

C327S180000, C327S314000, C361S093900, C361S100000

Reexamination Certificate

active

07952407

ABSTRACT:
An electronic monitor for monitoring characteristics of an AC power line for swells, sags, RMS voltage, impulses, total harmonic distortion (THD) and frequency. The waveform is received at the monitor, scaled to a lower magnitude, rectified by an op amp with zero offset voltage, converted a digital form which is representative of the waveform and processed to determine the occurrence of any irregularity in the AC power waveform. Two DMA channels are used to store each cycle, or groups of cycles, of the waveform into two buffers for further processing. An input surge protective circuit limits impulse voltage to the power supply. Related methods are also disclosed.

REFERENCES:
patent: 4631627 (1986-12-01), Morgan
patent: 6111365 (2000-08-01), Mirskiy et al.
patent: 6385238 (2002-05-01), Nguyen
patent: 6411482 (2002-06-01), Funke
patent: 7129713 (2006-10-01), Katz
PCT Search Report, Dec. 6, 2008, International Application No. PCT/US2007/070426.

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