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大功率開關電源工作原理

2019-05-18 09:07:03      點擊:
  大功率開關電源就是用通過電路控制開關管進行高速的導通與截止.將直流電轉化為高頻率的交流電提供給變壓器進行變壓,從而產生所需要的一組或多組電壓!
  轉化為高頻交流電的原因是高頻交流在變壓器變壓電路中的效率要比50Hz高很多.所以開關變壓器可以做的很小,而且工作時不是很熱!成本很低.如果不將50Hz變為高頻開關電源就沒有意義。
  開關電源的工作原理是:
  1.交流電源輸入經整流濾波成直流;
  2.通過高頻PWM(脈沖寬度調制)信號控制開關管,將那個直流加到開關變壓器初級上;
  3.開關變壓器次級感應出高頻電壓,經整流濾波供給負載;
  4.輸出部分通過一定的電路反饋給控制電路,控制PWM占空比,以達到穩定輸出的目的
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