UC知道自动化专业的译文，高手出招!!!!!!
来源：百度知道 编辑：UC知道 时间：2024/06/05 07:52:55
3.1 Sine-Triangle PWM of Three Phase Inverteres
One commonly used PWM scheme is called carrier based modulation. This uses a carrier frequency usually between 10 to 20 kHz to produce positive and negative pulses of varying frequency and varying width [5]. The pulse widths and spacings are arranged so that their weighted average produces a sine wave. Increasing the number of pulse per half cycle reduces the frequency of the output sine wave whilst, increasing the pulse widths increases the amplitude [1].
In sine-triangle PWM a triangular carrier waveform of frequency fs establishes the inverter switching frequency. This is compared with three sinusoidal control voltages that comprise the three phase system. The output of the comparators produces the switching scheme used to turn particular inverter MOSFETS on or off. These three control voltages have the same frequency as the desired output sine wave which, is commonly referred to as the modulating frequency, f1. The modulat
One commonly used PWM scheme is called carrier based modulation. This uses a carrier frequency usually between 10 to 20 kHz to produce positive and negative pulses of varying frequency and varying width [5]. The pulse widths and spacings are arranged so that their weighted average produces a sine wave. Increasing the number of pulse per half cycle reduces the frequency of the output sine wave whilst, increasing the pulse widths increases the amplitude [1].
In sine-triangle PWM a triangular carrier waveform of frequency fs establishes the inverter switching frequency. This is compared with three sinusoidal control voltages that comprise the three phase system. The output of the comparators produces the switching scheme used to turn particular inverter MOSFETS on or off. These three control voltages have the same frequency as the desired output sine wave which, is commonly referred to as the modulating frequency, f1. The modulat
3.1 三相逆变器的正弦-三角波脉冲宽度调制（PWM-Pulse Width Modulation 脉冲宽度调制）
一种常用的PWM调节机制被称作基于载波的调制。这种基于载波的调节机制利用频率通常在10-20kHz的载波来产生变频率变波长的正负脉冲[5]。如此设置的脉冲宽度和间距使它的加权平均值恰好是正弦波。增加每半个周期内的脉冲数量将减小输出正弦波的频率，同时，增加脉冲宽度将增加输出正弦波的幅值[1]。
在正弦-三角波脉冲宽度调制中，频率为fs的三角载波确定了逆变器的开关频率。将这个载波与组成三相系统的三相正弦控制电压相比较，比较仪的输出结果将产生关断逆变器特定MOSFET管的开关机制。这三相控制电压与期望输出的正弦波频率相同，这个频率通常被称为调节频率f1。调控比率定义为mf=f1/fs。mf的值应该是一个奇数，最好是3的倍数，这样可以消除主要的谐波，因为主要是这些谐波造成逆变器的损耗[3]。这种正弦-三角波调控方法的一个局限是，它只有有限的调节指数，所以无法充分利用直流源。通过使用只含有三次谐波的波形作为载波可以提高这个调节指数。这就形成了零序系统，在零序系统中，谐波的消除导致没有铁耗。
厉害啊,