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    GLOBAL CLOSED LOOP CONTROL SYSTEM WITH DV/DT CONTROL AND EMI/SWITCHING LOSS REDUCTION
    36.
    发明专利
    GLOBAL CLOSED LOOP CONTROL SYSTEM WITH DV/DT CONTROL AND EMI/SWITCHING LOSS REDUCTION 未知

    公开(公告)号：AU2003256840A1

    公开(公告)日：2004-02-16

    申请号：AU2003256840

    申请日：2003-07-25

    Applicant: INT RECTIFIER CORP

    Inventor： TAM DAVID ,  TAKAHASHI TOSHIO ,  HO EDDY YING-YIN ,  LI YONG PERRY ,  HONDA JUN

    IPC: H02M1/08 ,  H02M1/44 ,  H02M5/458 ,  H02P27/06 ,  H03K17/16 ,  H02M7/5387 ,  H02M7/12

    Abstract: A motor drive system control provides global closed loop feedback to cooperatively operate system components to adaptively reduce noise and provide noise cancellation feedback. An active EMI filter reduces differential and common mode noise on an input and provides a noise level indication to a system controller. Power switches in both a power converter and power inverter are cooperatively controlled with dynamic dv/dt control to reduce switching noise according to a profile specified by the controller. The dv/dt control is provided as an analog signal to a high voltage IC and codified as a pulse width for a level shifting circuit supplying control signals to the high voltage gate drive. A noise extraction circuit and technique obtain fast noise sampling to permit noise cancellation and adaptive noise reduction.

    Active emi filter with feed forward cancellation
    37.
    发明专利
    Active emi filter with feed forward cancellation 未知

    公开(公告)号：AU2003202223A8

    公开(公告)日：2003-07-24

    申请号：AU2003202223

    申请日：2003-01-03

    Applicant: INT RECTIFIER CORP

    Inventor： PELLY BRIAN ,  TAKAHASHI TOSHIO ,  HONDA JUN

    IPC: H03H11/04 ,  H02M1/12 ,  H02M1/15 ,  H02M1/44 ,  H02M5/458 ,  H03B1/00 ,  H02M5/45

    Abstract: An active EMI filter for reducing common mode current in a circuit comprising a rectifier coupled to an AC network, the rectifier supplying DC power to a DC bus, the DC bus feeding an inverter stage for providing AC power to a load, the load having a ground return line to a ground connection of the AC network, the active filter comprising: a transistor switching stage coupled across the DC bus, a current sensor coupled to the DC bus for sensing the common mode current flowing in the DC bus and proportional to the common mode current flowing in the ground return line from or to the load, the current sensor having inputs coupled to respective legs of the DC bus and an output driving the transistor switching stage, the transistor switching stage comprising two transistors driven by said output of the current sensor whereby one of said transistors is turned on by said current sensor output depending on the direction of common mode current in said DC bus, a capacitor coupling said transistor switching stage and said ground return line and wherein said current sensor and said switching stage are coupled in a feed forward arrangement whereby the switching stage is coupled across said DC bus between said rectifier and said current sensor, said capacitor providing a cancellation current to said ground return line from said transistor switching stage to substantially cancel the common mode current in said ground return line, said transistor switching stage and said current sensor having an amplitude gain of approximately unity, said current sensor comprising a current transformer having a primary connected in series with a respective leg of said DC bus, said two transistors of said transistor switching stage comprising two complementary type transistors coupled such that a corresponding main electrode of each transistor are coupled together in a common connection, another corresponding main electrode of each transistor being coupled to a respective secondary of each of said current transformer and wherein the control electrodes of said transistors are coupled to respective legs of said DC bus.

    Dynamic motor drive torque control based on power switching device temperature feedback
    38.
    发明专利
    Dynamic motor drive torque control based on power switching device temperature feedback 未知

    公开(公告)号：AU7129001A

    公开(公告)日：2001-12-24

    申请号：AU7129001

    申请日：2001-06-07

    Applicant: INT RECTIFIER CORP

    Inventor： TAKAHASHI TOSHIO

    IPC: H02P27/04 ,  H02P27/08 ,  H02P29/02 ,  H02H7/04

    Abstract: A circuit and method for permitting uninterrupted operation of a motor, even in the event of an over temperature condition, by dynamically controlling the motor torque based on the temperature of switching devices in the motor controller circuit. The circuit limits the torque current to either a fixed limit value if the temperature of the switching devices (or a current feedback signal for estimating the temperature of the switching devices) is below a predetermined value, or to a variable limit value which is inversely proportional to the temperature signal if the temperature of the switching devices (or the current feedback signal) exceeds the predetermined value. Accordingly, in the event of an over temperature condition, the motor continues to operate, but at a reduced torque, allowing the switching devices to cool.

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