UPS簡介,IGBT在UPS中的應(yīng)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
標(biāo)簽: IGBT UPS 中的應(yīng)用
上傳時間: 2013-12-03
上傳用戶:ly1994
設(shè)計了一種以UC3863芯片為核心控制芯片的開關(guān)電源,其電路采用半橋結(jié)構(gòu)的LLC諧振電路,帶有PFC電路,且整個電路設(shè)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(xiàn)。結(jié)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(jié)果驗證了該設(shè)計的可行性。
上傳時間: 2013-10-13
上傳用戶:sdfsdfs1
隨著功率開關(guān)器件的發(fā)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(chǎn)生的高次諧波卻對電網(wǎng)造成嚴重污染。在電力電子設(shè)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(tài)感應(yīng)加熱電源對于電網(wǎng)呈現(xiàn)非線性特性,從電網(wǎng)中輸出的電流就不是標(biāo)準(zhǔn)的正弦曲線。高頻諧波電流對電力設(shè)施產(chǎn)生過熱或其他危害。 Boost電路應(yīng)用到功率因數(shù)校正方面已經(jīng)較為成熟,對于幾百瓦小功率的功率因數(shù)校正,常規(guī)的電路是可以實現(xiàn)的。但是對于大功率諸如感應(yīng)加熱電源,還存在很多的實際問題。為了解決開關(guān)器件由于二極管反向恢復(fù)時產(chǎn)生的沖擊電流而易損壞的情況,減少開關(guān)器件在高頻下的開關(guān)損耗,本文采用一種無源無損緩沖電路取代傳統(tǒng)的LC濾波電路。在分析了軟開關(guān)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(yīng)用Matlab軟件進行了仿真,并通過實驗結(jié)果驗證了理論分析的正確性。
標(biāo)簽: APFC 軟開關(guān) 倍頻 感應(yīng)加熱電源
上傳時間: 2014-12-24
上傳用戶:RQB123
01:開關(guān)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(guān)電源,其限流點為什么會隨輸入電壓變化? 04:開關(guān)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(dāng)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(wěn)定的開關(guān)電源,組成系統(tǒng)時,為什么會產(chǎn)生振蕩?
標(biāo)簽: 開關(guān)電源
上傳時間: 2013-10-21
上傳用戶:qingzhuhu
功率因數(shù)自動補償控制器是用于低壓配電系統(tǒng)進行無功功率補償?shù)膶S每刂破?,可以與電壓等級在400V 以下的靜態(tài)電容屏(柜)配套使用。輸出路數(shù)有6、8、10、12 四種規(guī)格。產(chǎn)品符合GB/T15576-2008 國家標(biāo)準(zhǔn),具有功能完善、運行穩(wěn)定可靠、控制精度高等特點。功率因數(shù)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(shù)、溫度可通過通訊接口傳送到其它外部設(shè)備。具備過電壓保護、欠流鎖定、電網(wǎng)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.
標(biāo)簽: Module 如何制作 降壓穩(wěn)壓器 輸入輸出
上傳時間: 2013-10-22
上傳用戶:ztj182002
v開關(guān)電源拓撲結(jié)構(gòu)綜述 v開關(guān)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
標(biāo)簽: 開關(guān)電源 拓撲結(jié)構(gòu)
上傳時間: 2013-10-12
上傳用戶:manlian
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