UPS簡介,IGBT在UPS中的應用 DC/AC逆變器,BOOST升壓電路,AC/DC整流,充電電路 防止IGBT損壞措施
上傳時間: 2013-12-03
上傳用戶:ly1994
設計了一種以UC3863芯片為核心控制芯片的開關電源,其電路采用半橋結構的LLC諧振電路,帶有PFC電路,且整個電路設計有自限流功能。分析了LLC諧振變換器整個電路的工作原理及自限流功能的實現。結合交流220 V輸入1KW輸出電路,分別對PFC電路和主電路進行仿真,仿真結果驗證了該設計的可行性。
上傳時間: 2013-10-13
上傳用戶:sdfsdfs1
隨著功率開關器件的發展,電力電子裝置日益小型化和高頻化,電氣性能大幅提高,但是隨之產生的高次諧波卻對電網造成嚴重污染。在電力電子設備中,整流器(AC/DC變流器)占有較大的比例,是主要的污染源。由于固態感應加熱電源對于電網呈現非線性特性,從電網中輸出的電流就不是標準的正弦曲線。高頻諧波電流對電力設施產生過熱或其他危害。 Boost電路應用到功率因數校正方面已經較為成熟,對于幾百瓦小功率的功率因數校正,常規的電路是可以實現的。但是對于大功率諸如感應加熱電源,還存在很多的實際問題。為了解決開關器件由于二極管反向恢復時產生的沖擊電流而易損壞的情況,減少開關器件在高頻下的開關損耗,本文采用一種無源無損緩沖電路取代傳統的LC濾波電路。在分析了軟開關電路的工作原理以及逆變模塊的分時-移相功率控制策略后,應用Matlab軟件進行了仿真,并通過實驗結果驗證了理論分析的正確性。
上傳時間: 2014-12-24
上傳用戶:RQB123
01:開關電源的帶寬是不是越高越好? 02:為什么PFC的帶寬要控制在10~20Hz? 03:用UC3842~45控制的開關電源,其限流點為什么會隨輸入電壓變化? 04:開關電源的帶容性負載能力是不是越大越好? 05:在峰值電流控制中,當占空比大于0.5時,為什么要加斜波補償電路? 06:兩個完全穩定的開關電源,組成系統時,為什么會產生振蕩?
標簽: 開關電源
上傳時間: 2013-10-21
上傳用戶:qingzhuhu
功率因數自動補償控制器是用于低壓配電系統進行無功功率補償的專用控制器,可以與電壓等級在400V 以下的靜態電容屏(柜)配套使用。輸出路數有6、8、10、12 四種規格。產品符合GB/T15576-2008 國家標準,具有功能完善、運行穩定可靠、控制精度高等特點。功率因數自動補償控制器具備RS485 通訊接口,其所采樣得到的電壓、電流、頻率、有功功率、無功功率、諧波含量、功率因數、溫度可通過通訊接口傳送到其它外部設備。具備過電壓保護、欠流鎖定、電網諧波過大保護功能。
上傳時間: 2013-11-19
上傳用戶:ewtrwrtwe
DC/DC 升壓IC:The FP6291 is a current mode boost DC-DC converter. Its PWM circuitry with built-in 0.25 Ω power MOSFET make this regulator highly power efficient. The internal compensation network also minimizes as much as 6 external component counts. The non-inverting input of error amplifier connects to a 0.6V precision reference voltage and internal soft-start function can reduce the inrush current. The FP6291 is available in the SOT23-6L package and provides space-saving PCB for the application fields.
上傳時間: 2013-11-07
上傳用戶:3294322651
A number of conventional solutions have been available forthe design of a DC/DC converter where the output voltageis within the input voltage range—a common scenarioin Li-Ion battery-powered applications—but none werevery attractive until now. Conventional topologies, suchas SEPIC or boost followed by buck, have numerousdisadvantages, including low effi ciency, complex magnetics,polarity inversion and/or circuit complexity/cost. TheLTC®3785 buck-boost controller yields a simple, effi cient,low parts-count, single-converter solution that is easyto implement, thus avoiding the drawbacks associatedwith traditional solutions.
上傳時間: 2013-10-21
上傳用戶:ljt101007
Video cable driver amplifi er output stages traditionallyrequire a supply voltage of at least 6V in order to providethe required output swing. This requirement is usuallymet with 5V supplies by adding a boost regulator or asmall local negative rail, say via the popular LT®1983-3.Such additional circuitry is unnecessary in typical 1VP-Pvideo connections, such as HD component video, if thecable driver amplifi ers simply offer near rail-to-rail outputcapability when powered from 5V.
上傳時間: 2013-11-16
上傳用戶:yanyangtian
Linear Technology’s DC/DC step-down μModule®regulators are complete switchmode power supplies in asurface-mount package. They include the DC/DC controller,inductor, power switches and supporting circuitry.These highly integrated regulators also provide an easysolution for applications that require negative outputvoltages. In other words, these products can operate asinverting buck-boost regulators. As a result, the lowestpotential in the circuit is not the standard 0V, but –VOUT,which must be tied to the μModule regulator’s GND. Allsignals are now referred to –VOUT.
上傳時間: 2013-10-22
上傳用戶:ztj182002
v開關電源拓撲結構綜述 v開關電源分類 v非隔離式拓撲舉例 BUCK BOOST BUCK-BOOST v隔離式拓撲舉例 正激式 反激式
上傳時間: 2013-10-12
上傳用戶:manlian