Prediction current control at time of driving load in pulse width modulation mode
    27.
    发明专利
    Prediction current control at time of driving load in pulse width modulation mode 有权
    脉冲宽度调制模式下驱动负载时的预测电流控制

    公开(公告)号:JP2010148349A

    公开(公告)日:2010-07-01

    申请号:JP2009281976

    申请日:2009-12-11

    CPC classification number: H02M3/157 H02M2001/0019 H02M2003/1555

    Abstract: PROBLEM TO BE SOLVED: To provide a method for controlling a load current even when a current ripple significantly varies. SOLUTION: The method includes: (A) a step of setting a threshold value of a comparator in correspondence to a reference current value for a load; (B) a step of measuring a first time interval from an active ON state of an ON phase of a power stage to a point of time when the load current reaches the reference current value; and (C) a step of continuously maintaining the power stage in the ON phase. Step (C) is performed while the power stage is further maintained in the predictive ON state for an additional time interval. The additional time interval is determined based on an average value of the first time interval and a time interval of the active ON state measured during a past PWM (pulse width modulation) cycle. COPYRIGHT: (C)2010,JPO&INPIT

    Abstract translation: 要解决的问题:即使当电流纹波显着变化时,也提供用于控制负载电流的方法。 该方法包括:(A)与负载的基准电流值对应地设定比较器的阈值的步骤; (B)从功率级的导通相的有效接通状态到负载电流达到基准电流值的时刻的第一时间间隔的步骤; 和(C)在ON阶段连续地保持功率级的步骤。 在功率级进一步保持在预测接通状态下进行另外的时间间隔时,执行步骤(C)。 基于第一时间间隔的平均值和在过去的PWM(脉冲宽度调制)周期期间测量的有效接通状态的时间间隔来确定附加时间间隔。 版权所有(C)2010,JPO&INPIT

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