Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2002-12-03
2011-12-06
Santana, Eduardo Colon (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S810000, C318S811000
Reexamination Certificate
active
08072180
ABSTRACT:
A device for filtering a carrier frequency of a PWM waveform. The device includes a low-pass filter for converting the PWM waveform into an analog signal. The device further includes a sampling analog-to-digital converter receiving the analog signal from the low-pass filter and the device also includes a controller for causing the non-integrating analog to digital converter to sample the PWM waveform at the pulse frequency rate thereby rejecting the carrier frequency. As already stated the PWM waveform includes a pulse which has a leading edge, a top portion, and a trailing edge. In one embodiment, the controller causes the A/D converter to sample during the top of the pulse. Preferably, the controller causes the A/D converter to sample at substantially the center of the pulse.
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Blasko, Vladimir “Sampling of Discontinuous Voltage and Current Signals in Electrical Drives: A System Approach,”IEEE Transactions on Industry Applications, vol. 34, No. 5, pp. 1123-1130 Sep./Oct. 1998.
Heinzmann John David
Sachs Jason M.
Colon Santana Eduardo
DEKA Products Limited Partnership
McCormick Paulding & Huber LLP
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