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Device for energy load control

  • US 5,903,213 A
  • Filed: 11/04/1996
  • Issued: 05/11/1999
  • Est. Priority Date: 07/28/1994
  • Status: Expired due to Term
First Claim
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1. An apparatus for receiving inputs including ripple signals, and operating on the information contained therein, said apparatus including:

  • a micro-controller having at least one serial communication port; and

    means for receiving said ripple signal, including an analogue to digital converter which is operated in conjunction with said micro-controller such that said signal is digitally band-pass filtered, said ripple signal having a frequency in the range of 50-2000 Hz;

    said means for receipt of said ripple signal further including program code contained in said micro-controller means which controls said converter and contains an algorithm which uses a discrete Fourier transform-implemented bandpass filter of sin(x)/x response at a ripple signal frequency, wherein the programmable sampling rate of said converter is set at a minimum of four times said ripple signal frequency and samples of said signal are taken at 0°

    , 90°

    , 180° and

    270°

    ;

    signal power is determined by summing the squares of the contents of a real and an imaginary accumulator wherein said contents have accumulated over a programmable sampling time which is dependent on the bandwidth of said filter;

    the contents of said real accumulator is the sum of samples taken at 0°

    less the sum of samples taken at 180°

    , and the contents of said imaginary accumulator is the sum of samples taken at 90°

    less the sum of samples taken at 270°

    ;

    wherein said micro-controller is for operating on one or more of a plurality of output ports according to at least one option in a range of programmable options, said selection being dependent on the information contained in said received inputs, andeach output port is capable of acting as an interface with other peripheral devices.

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