DCS550-S02-0200-05-00-00

DCS550-S02-0200-05-00-00   3ABD00026912  现货
直流斩波是将固定的直流电压变换成可变的直流电压，也称为DC/DC变换。

斩波器的工作方式有两种，一是脉宽调制方式，Ts（周期）不变，改变Ton（通用，Ton为开关每次接通的时间），二是频率调制方式，Ton不变，改变Ts（易产生干扰）。

其具体的电路由以下几类：

1、Buck电路：降压斩波器，其输出平均电压Uo小于输入电压Ui，输出电压与输入电压极性相同。

2、Boost电路：升压斩波器，其输出平均电压Uo大于输入电压Ui，输出电压与输入电压极性相同

3、Buck-Boost电路：降压或升压斩波器，其输出平均电压Uo大于或小于输入电压Ui，输出电压与输入电压极性相同，电感传输。

4、Cuk电路：降压或升压斩波器，其输出平均电压Uo大于或小于输入电压Ui，输出电压与输入电压极性相反，电容传输。

用直流斩波器代替变阻器可节约电能(20~30)%。直流斩波器不仅能起调压的作用(开关电源)， 同时还能起到有效地抑制电网侧谐波电流噪声的作用。

当今软开关技术使得DC/DC发生了质的飞跃， 美国VICOR公司设计制造的多种ECI软开关DC/DC变换器，其 较大输出功率有300W、600W、800W等，相应的功率密度为(6、2、10、17)W/cm^3，效率为(80-90)%。 日本NemicLambda公司较新推出的一种采用软开关技术的高频 开关电源模块RM系列，其开关频率为(200-300)kHz，功率密度已达到27W/cm^3，采用同步整流器(MOS-FET代替 肖特基二极管)，是整个电路效率提高到90%。


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