3BHE036348R0101模 塊參詳
3BHE036348R0101模 塊參詳
3BHE036348R0101模 塊參詳
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DC/DC變換是將可變的直流電壓變換成固定的直流電壓,也稱為直流斬波。斬波器的工作方式有兩種,一是脈寬調制方式Ts不變,改變ton(通用),二是頻率調制(
(1)Buck電路——降壓斬波器,其輸出平均電壓U0小於輸入電壓Ui,極性相同。
(2)Boost電路——升壓斬波器,其輸出平均電壓U0大於輸入電壓Ui,極性相同。
(3)Buck-Boost電路——降壓或升壓斬波器,其輸出平均電壓U0大於或小於輸入電壓Ui,極性相反,電感傳輸。
(4)Cuk電路——降壓或升壓斬波器,其輸出平均電壓U0大於或小於輸入電壓Ui,極性相反,電容傳輸。還有Sepic、Zeta電路。
上述為非隔離型DC-DC變換器電路,隔離型DC-DC變換器有正激電路、反激電路、半橋電路、全橋電路、推挽電路。
當今軟開關技術使得DC/DC發生了質的飛躍,美國VICOR公司設計制造的多種ECI軟開關DC/DC變換器,其*大輸出功率有300W、600W、800W等,相應的功率密度為(6.2、10、17)W/cm3,效率為(80∼90)%。日本TDK-Lambda公司*新推出的一種採用軟開關技術的高頻開關電源模塊RM係列,其開關頻率為(200∼300)kHz,功率密度已達到27W/cm3,採用同步整流器(MOSFET代替肖特基二極管),使整個電路效率提高到90%。