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大功率充电机在铁路辅助电源系统中的应用

2019-3-18 14:53:44??????点击:
大功率充电机在行?#30340;?#37096;是较有优势且备受关注的一项,并在各行业广泛应用,那大功率充电机在铁路辅助电源系统中是怎样得以应用的呢?
SPWM(Sinusoidal PWM)法是一种比较成熟的,目前使用较广泛的PWM法。SPWM法就是以该结论为理论基础,用脉冲宽度按正弦规律变化而和正弦波等效的PWM波形即SPWM波形控制逆变电路中开关器件的通断,使其输出的脉冲电压的面积与所希望输出的正弦波在相应区间内的面积相等,通过改变调制波的频率和幅值则可调节逆变电路输出电压的频率和幅值。PWM的全称是Pulse Width Modulation(脉冲宽度调制),它是通过改变输出方波的占空比来改变等效的输出电压。广泛地用于电动机调速和阀门控制,比如我们现在的电动车电机调速就是使用这种大功率充电机。所谓SPWM,就是在PWM的基础上改变了调制脉冲方式,脉冲宽度时间占空比按正弦规率排列,这样输出波形经过适当的滤波可以做到正弦波输出。大功率充电机广泛地用于直流交流逆变器等,比如高级一些的UPS就是一个例子。三相SPWM是使用SPWM模拟市电的三相输出,在变频器领域被广泛的采用。上海施能电器设备有限公司始建于1984年,上海市高新技术企业,中国工业车辆优秀配套供应商,上海电器行业名优产品,主要生产工频系列充电机,高频系列充电机,锂电池充电机系列放电机系列充放电机等电器产品。
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