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    • 6. 发明授权
    • Inverter control apparatus using a two-phase modulation method
    • 变频调速装置采用两相调制方式
    • US5650708A
    • 1997-07-22
    • US401988
    • 1995-03-10
    • Takeshi SawadaHiroshi FujitaHiroya TsujiKanji TakeuchiTsuneyuki Egami
    • Takeshi SawadaHiroshi FujitaHiroya TsujiKanji TakeuchiTsuneyuki Egami
    • B60L11/18H02M7/5387H02P7/00
    • B60L11/1803H02M7/53875Y02T10/7005
    • An inverter control apparatus for driving a polyphase AC motor for preventing abrupt changes in motor drive currents when switching of one phase is stopped. The apparatus includes a signal generator for generating duty signals of drive signals of respective phases on the basis of a generated reference waveform and a signal modifier for selecting one of the duty signals of one phase, holding it at a predetermined level, and modifying the duty signals of other phases according to the value required to hold the selected duty signal. On the basis of three-phase signal voltage levels, a decision is made on voltage fixing phase intervals by a phase decision circuit, and shift values are determined by an adder at every voltage fixing phase interval. Shift values are selected by a multiplexer according to the outputs of the phase decision circuit and added to triangular wave voltage. Resultant sum values are compared with the three-phase signal voltages to form a three-phase PWM signal.
    • 用于驱动多相交流电动机的逆变器控制装置,用于防止一相切换时电动机驱动电流的突然变化。 该装置包括:信号发生器,用于基于产生的参考波形产生各相的驱动信号的占空比信号;以及信号修正器,用于选择一个相位的占空比信号,将其保持在预定电平,并修改占空比 根据保持所选择的占空比信号所需的值的其他相位的信号。 基于三相信号电压电平,通过相位判定电路对电压固定相位间隔进行判定,并且在每个电压固定相间隔时由加法器确定偏移值。 移位值由多路复用器根据相位判定电路的输出选择,并加到三角波电压上。 将结果和值与三相信号电压进行比较,形成三相PWM信号。