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開關電源和變壓器的區別

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開關電源和變壓器的區別

發布日期:2018-08-15 作者:江蘇鶴都電器有限公司 點擊:

首先,開關電源是直流---直流,變壓器是交流---交流;其次,開關電源工作的頻率較高(一般在幾十千赫茲),而變壓器有高頻,也有低頻,開關電源里用到的脈沖變壓器就是高頻變壓器,鐵芯是鐵氧體之類的磁芯,其體積小,效率高(頻率越高效率就越高),說變壓器大家首先想到的是工頻變壓器,它的工作頻率50赫茲,就屬于低頻變壓器了,其鐵芯必須用軟磁性材料的硅鋼片疊加起來(防止渦流產生焦耳熱);再次之:二者功能范疇不盡相同,開關電源包含了脈沖變壓器,同時也包含了上下端整流部分,而不論是哪個頻率段的變壓器也只是變壓而已,沒有整流功能;

如果說案例,咱就說說電視機的電源電路吧!彩電的電源部分就是典型的開關電源;過去的黑白電視機電源電路部分就是工頻變壓器加上整流濾波穩壓電路組成的。彩電電源是將220V的交流電直接整流為300V左右的直流電,再由開關三極管切割成高頻脈沖,再通過脈沖磁芯變壓器降壓,再整流濾波輸出低壓直流(它的整個過程也解決了穩壓問題);這些過程的總和才稱得起開關電源。而黑白電視機里的工頻變壓器老哥一個就代表了你所說的變壓器,它不包含整流濾波電路。所以說二者的功能范疇不盡相同。


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