【经验】开关电源整流桥参数计算选型并举例说明
开关电源电路一般采用由整流管构成的整流桥,亦可直接选用成品整流桥,完成桥式整流。全波桥式整流器简称硅整流桥,它是将四只硅整流管接成桥路形式,再用塑料封装而成的半导体器件。它具有体积小、使用方便、各整流管的参数一致性好等优点,可广泛用于开关电源的整流电路。硅整流桥有4个引出端,其中交流输入端、直流输出端各两个。本文主要介绍如何对整流桥进行计算选型,并举例说明。
图1 整流桥后电压电流波形示意图
整流桥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(A)。整流桥的反向击穿电压URR应满足下式要求:
(1)
举例说明,当交流输入电压范围是85~265V时,UINMAX=265V,由式(1)计算出UBR=468.4V,可选耐压大于等于600V的成品整流桥。设输入有效值电流为IRMS,整流桥额定的有效值电流为IBR,应当至少满足IBR≥2*IRMS。计算IRMS的公式如下:
(2)
式中,PO为开关电源的输出功率,η为电源效率,UINMIN为交流输入电压的最小值,cosφ为开关电源的功率因数,取值可以为cosφ=0.5~0.7。
例如,设计一个15V/3A(45W)开关电源,交流输入电压范围是85~265V,要求η=80%。将Po=45W、η=80%、UINMIN=85V、 cosψ=0.7代入(2)式得到,IRMS=0.96A。实际则可以选用2A/600V的整流桥,以留出一定余量。
世强代理的丽正国际推出的单相整流桥产品2RS105M,反向击穿电压600V,正向压降1.1V,额定导通电流为2A,采用四脚立式直插封装,满足上面例子中的需求。
图2 2RS105M 外形尺寸
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目录- Company Profile SCHOTTKY RECTIFIERS/DIODES RECOVERY DIODES STANDARD RECOVERY RECTIFIERS SURFACE MOUNT BRIDGE GLASS PASSIVATED THRU-HOLE BRIDGE RECTIFIERS/ZENER DIODES GLASS PASSIVATED TRANSIENT VOLTAGE SUPPRESSORS SMALL SIGNAL SWITCHING DIODES TRANSISTORS/SILICON CARBIDE SCHOTTKY RECTIFIERS PRODUCTS IMAGES MOSFET POWER PORT ESD PRODUCTION DIODES REEL/BULK/TUBE/AMMO PACKAGING INFORMATION OUTLINE DRAWING
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定制液冷板尺寸5mm*5mm~3m*1.8m,厚度2mm-100mm,单相液冷板散热能力最高300W/cm²。
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可定制位移传感器量程范围10~600mm,该YWD型位移传感器表面有带刻度的透明窗☐,每毫米的变化量误差不超过3ue/mm,可在静态、准静态和低频动态下工作。主要指标:非线性<0.2%;供桥电压<10v;测试精度:0.01mm。
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