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ASEMI整流桥DB207的导通时间与参数选择
2022-07-06 09:44:00 【qyx3868】
编辑-Z
50Hz交流电压经过全波整流后变成脉动直流电压u1,再通过输入滤波电容得到直流高压U1。理想情况下,整流桥DB207的导通角应为180°(导通范围为0°到180°),但由于滤波电容C的作用,只能在很短的时间内接近交流峰值电压,输入电流才流过整流桥给C充电。50Hz交流电的半周期为10ms,整流桥的导通时间为tC≈3ms,其导通角仅为54°(导通范围为36°~90°)。因此,整流桥DB207实际通过的是窄脉冲电流。桥式整流滤波电路原理如图1(a)所示,整流滤波电压波形和整流电流波形分别如图1(b)和(c)所示。
总结几点:
(1)整流桥的上述特性可以相当于输入电压频率约为30%的占空比。
(2)整流二极管的初级导通过程可视为一个“门控脉冲”,其脉冲重复频率等于交流电网的频率(50Hz)。
(3)为了降低开关电源中500kHz以下的传导噪声,有时会用两只普通硅整流器和两只快恢复二极管组成整流桥。
整流桥DB207的参数选择
隔离式开关电源一般采用整流管组成的整流桥,也可以直接选用成品整流桥完成桥式整流。全波桥式整流器DB207称为硅整流桥,它是将四个硅整流管连接成桥式电路,然后用塑料封装而成的半导体器件。DB207具有体积小、使用方便、各整流管参数一致性好等优点,可广泛应用于开关电源的整流电路中。硅整流桥DB207有4个端子,包括两个交流输入端和两个直流输出端。
硅整流桥的平均最大整流电流分为0.5~40A等多种规格,最大反向工作电压有50~1000V等多种规格。小功率硅整流桥DB207可以直接焊接在印制板上,而大、中功率硅整流桥要用螺丝固定并安装合适的散热片。
整流桥DB207的主要参数有反向峰值电压URM(V)、正向压降UF(V)、平均整流电流Id(A)、正向峰值浪涌电流IFSM(A)、最大反向漏电流IR(μA)。
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