专利汇可以提供Pwm system inverter专利检索,专利查询,专利分析的服务。并且PURPOSE:To prevent core saturation of a motor and the like by excluding an even harmonic wave ingredient by a method wherein synchronization is obtained in such way that the phase and the direction of a carrier wave signal and a control signal, to be used for sine wave approximation, are coordinated and a switching frequency of a control element is unified. CONSTITUTION:An output frequency control signal FS is given to a sine wave generator 1, a zero cross point of its output is detected by a zero-point detecting circuits 2-4, an output of a delta wave generating circuit 11 is reset at a zero cross point by having analog switches 8-10 in a conducted status with a timing output and at the same time a synchronization, which is giving an integrating direction in accord with the direction of the control signal, is performed. Therefore, synchronization with a carrier wave signal is obtained by a control signal of a polarity inverting device and an even harmonic wave ingredients of an output voltage can be removed, because the direction of the carrier wave signal is put in accord with the polarity of the control signal.,下面是Pwm system inverter专利的具体信息内容。
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