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CN110266209A 一种H桥逆变器的SVPWM调制方法 无效 - 撤回

一种H桥逆变器的SVPWM调制方法
摘要：
本发明属于电力电子技术领域，尤其涉及一种H桥逆变器的SVPWM调制方法。该方法包括：沿Vab建立β轴，α轴与β轴正交，将整个空间划分为扇区Ⅰ和扇区Ⅱ，扇区Ⅰ为H桥逆变器工作在[0，π]时间段，扇区Ⅱ为H桥逆变器工作在[π，2π]时间段；对于给定的期望输出矢量电压 根据“伏秒平衡”原理，得到每个扇区的调制时间Ta和Tb；输入三角载波与每个扇区的调制时间Ta、Tb，结合H桥逆变器输出的矢量电压分别为 和 时开关管的控制信号，获得开关管S1和开关管S3的驱动信号和驱动信号时间段。本发明提供的SVPWM调制方法，在调制的每个三角波的顶点与底点都进行重新计算调制时间Ta与Tb，改善H桥逆变器的某一相的开关器件导通时间过长，引发的功率以及热量不平衡问题。
摘要（英）：

The invention belongs to the technical field of power electronics, and particularly relates to an SVPWM modulation method of an H-bridge inverter. The method comprises the steps of building a Beta axis along Vab, allowing an Alpha axis to be orthogonal to the Beta axis, and dividing the whole space into a fan region I and a fan region II, wherein the fan region I is in a way that the H-bridge inverter works at [0, Phi] time frame, and the fan region II is in a way that the H-bridge inverter works at [Phi, 2Phi] time frame; obtaining modulation time Ta and Tb of each fan region from a given expected output vector voltage according to a volt-second balance principle; and inputting a triangular carrier and the modulation time Ta and Tb of each fan region, and acquiring driving signals and driving signal time frames of a switch tube S1 and a switch S3 by combining output vector voltages of the H-bridge inverter respectively used as control signals of the switch tubes. According to the SVPWM modulation method provided by the invention, the modulation time Ta and Tb is calculated again at a top point and a bottom point of each modulated triangular wave, and the problem of excessively long conduction time of a switch device of a certain phase of the H-bridge inverter to cause power and heat unbalance is solved.

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