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为什么电源模块不能并联使用?

2020-08-15

ZAIDAGONGLVYINGYONGCHANGHE,WANGWANGDANGEDIANYUANMOKUAIBUNENGMANZUYAOQIU,TONGCHANGXUYAOBINGLIANSHIYONG。DANSHI,HENDUODIANYUANMOKUAIJUNBUKEYIBINGLIANSHIYONG,RUOCHULIBUHAOHUIDAOZHIZHENGGEXITONGDESHIXIAO。XIAMIANFENXIXIAWEISHENMEDIANYUANMOKUAIBUNENGBINGLIANSHIYONG。

 

上图为电源模块的内部等效与输出负载特性曲线:VO=fIO),R为模块的输出阻抗(包含导线电阻和接触电阻等),空载时,模块输出电压为最大值VOmax)。当负载电流变化△IO时,负载电压变化量为△VO,△VO=R*IOR*IO也表示模块的负载调整率。负载电压VO与负载电流IO的关系可表示为:VO=VOmax-R*IO

 

RUSHANGTUSUOSHI:DANGLIANGGEMOKUAIXIANGHUBINGLIAN,ZEYOU:

安徽快3走势图 VO1=VO1(max)-R1*IO1

VO2=VO2(max)-R2*IO2

IO=IO1+IO2

 

如果两个模块的参数完全相同时,即:VO1(max)= VO2(max)R1=R2,则两条负载特性曲线重合,能实现负载电流均匀分配。但在实际应用中,两个具有相同容量的模块,VO1(max)VO2(max)R1R2的参数也不可能完全做到相同。从图中可以看出,由于输出到负载RL的等效阻抗R1R2很小,输出电压即便出现很小的差别也会引起输出电流很大的变化。例如当负载RL电流由IO= IO1+ IO2增大到IO=IO1+IO2时,负载特性曲线斜率小的模块1将承受大部分负载电流,模块1将运行在满载或过载限流状态,影响模块的可靠性。

安徽快3走势图  

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电源模块并联电路的设计,要比串联电路设计复杂得多,需要考虑输出电压差、输出阻抗匹配、输出电流均衡等问题,常见有电阻并联法、二极管并联法、电流均流并联法。