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8 records (took 0.026 seconds)

    1.
    发明专利
    未知

    公开(公告)号：DE602008000771D1

    公开(公告)日：2010-04-22

    申请号：DE602008000771

    申请日：2008-01-11

    Applicant: ST MICROELECTRONICS SRL

    Inventor： D ANGELO GIUSEPPE ,  MOSELLI GIOVANNI

    IPC: H02M7/5387

    Abstract: A method of estimating the current flowing through a winding of a poly-phase electric load at a certain instant while keeping constant the duty-cycle of the PWM driving signals and without increasing relevantly the THD comprises the steps of imposing that between two consecutive edges of the control phases there is at least a certain minimum time, sufficient for measuring the current flowing through a DC_LINK line, but keeping symmetrical all control phases in respect to the instant of the cycle at which the current is to be determined. It is checked whether or not, in the switching cycle during which the current measurement is to be made, the edges of the control phases are sufficiently spaced one from the other. If not, switchings are purposely generated such that the control phases be always symmetrical in respect to the instant 0 or T/2, but with edges spaced one from the other by a certain minimum time.

    6.
    发明专利
    未知

    公开(公告)号：DE69619509D1

    公开(公告)日：2002-04-04

    申请号：DE69619509

    申请日：1996-07-24

    Applicant: ST MICROELECTRONICS SRL

    Inventor： DI GUARDO MARIO ,  D ANGELO GIUSEPPE ,  LO PRESTI MATTEO

    IPC: G06F7/68 ,  H02M7/5395 ,  H02P27/08 ,  H03K7/08 ,  H02M7/5387

    Abstract: In a fully digital PWM controller employing a sine-triangle modulating technique, the step of linearizing the dependence of the selected scanning frequency of the memory containing the digital samples of the modulating sinusoid, from the value of the digital selection datum, improves regulation at low speed by improving the resolution of selectable frequency values. The PWM driving signals produced by a fully digital controller implementing the linearization step of the invention show an F.F.T. extremely close to the F.F.T. of comparable PWM driving signals produced through a conventional analog technique.

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