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"ABSTRACTThe importance of power electronics has significantly increased in the last few decades. Many applications such as electric vehicles and renewable energy systems would not be possible without them. Power electronics is based primarily on the switching of power semiconductor devices. One of the most important power semiconductors used is silicon-controlled rectifier or thyristor. Its characteristics allows for control of electric power. However, thyristors operating in DC systems requires an additional circuit to turn off. This circuit is called an extinction circuit. This thesis used the software LTspice to simulate the circuit and analyze the waveforms produced by it and the software EAGLE to design the printed circuit broad. The developed ignition circuit produced a current of 27 mA on the gate of the thyristor which is controlled manually by a push button to turn on the thyristor. During the measurement of the extinction circuit, the supply voltage and load current were varied to see its effects on the circuit turn off time. The measurement results show that an increasing supply voltage cause the circuit turn off time to increase while increasing the load current resulted in a lower circuit turn off time.

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ABSTRAKPentingnya elektronika daya telah meningkat secara signifikan dalam beberapa dekade terakhir. Banyak aplikasi seperti kendaraan listrik dan sistem energi terbarukan tidak akan mungkin diporduksi tanpanya. Elektronika daya didasarkan pada penggunaan perangkat semikonduktor daya. Salah satu perangkat semikonduktor yang paling penting digunakan adalah Silicon Controlled Rectifier atau thyristor. Karakteristiknya memungkinkan untuk mengontrol tenaga listrik. Namun, thyristor yang beroperasi dalam sistem DC membutuhkan rangkaian tambahan untuk dimatikan. Rangkaian ini disebut extinction circuit. Skripsi ini menggunakan perangkat lunak LTspice untuk mensimulasikan rangkaian dan menganalisis bentuk gelombang yang dihasilkan olehnya dan perangkat lunak EAGLE untuk merancang PCB. Ignition circuit yang dikembangkan menghasilkan arus sebesar 27 mA di gate thyristor yang dikendalikan secara manual dengan menekan tombol untuk menyalakan thyristor. Selama pengukuran extinction circuit, tegangan suplai dan arus beban divariasikan untuk melihat efeknya pada circuit turn off time. Hasil pengukuran menunjukkan bahwa peningkatan tegangan suplai menyebabkan circuit turn off time untuk meningkat sedangkan meningkatkan arus beban mengakibatkan circuit turn off time yang lebih rendah."

"Sumber 220V AC satu fasa dari PLN harus terlebih dahulu dikonversikan dengan menggunakan rangkaian penyearah, sehingga dapat digunakan dalam pengisian energi pada baterai. Rangkaian penyearah dengan tegangan keluaran yang dapat dikontrol dapat digunakan untuk mengisi berbagai jenis tipe baterai. Salah satu cara untuk mengatur nilai tegangan keluaran penyearah adalah dengan menggunakan IGBT sebagai switch. Sedangkan tipe rangkaian penyearah yang dipakai dalam simulasi menggunakan software PSIM adalah penyerah gelombang penuh transformator CT dengan menggunakan filter kapasitor untuk memperkecil besarnya riak tegangan. Transformator CT dengan perbandingan lilitan primer dan sekunder 11:4 dan kapasitor sebesar 0.833 F digunakan dalam simulasi. Terdapat dua mode pengaturan output penyearah yaitu variasi tegangan dengan arus konstan 60A yang dilakukan dengan mengatur rentang sudut penyalaan IGBT dan variasi arus dengan mengatur besarnya nilai variabel kapasitor. Pada mode variasi tegangan diperoleh tingkat error maksimum sebesar 2.94% pada VDC ref 72 V dengan sudut penyalaan (0o-64.75o) dan (180o-244.75o).

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Source 220V AC single phase from PLN must first be converted using the rectifier circuit, so it can be utilized in charging the energy in the battery. Rectifier circuit with output voltage that can be controlled can be used to fill various types of batteries. One way to set the value of the output voltage rectifier is to use IGBT as switches. While type rectifier circuit used in the simulation using PSIM software is the full wave rectifier transformer CT by using the filter capacitors to minimize the magnitude of the voltage ripple. CT transformer with primary and secondary windings ratio 11: 4 and capacitor of 0.833 F used in the simulation. There are two modes, namely rectifier output setting voltage variation with a constant current of 60A is performed by adjusting the firing angle range IGBT and current variation by adjusting the value of the variable capacitor. In mode voltage variation obtained the maximum error of 2.94% at 72 VDC ref with the firing angle (0o-64.75o) and (180o-244.75o)."

"The devices described in “Advanced MOS-Gated Thyristor Concepts” are utilized in microelectronics production equipment, in power transmission equipment, and for very high power motor control in electric trains, steel-mills, etc. Advanced concepts that enable improving the performance of power thyristors are discussed here, along with devices with blocking voltage capabilities of 5,000-V, 10,000-V and 15,000-V. Throughout the book, analytical models are generated to allow a simple analysis of the structures and to obtain insight into the underlying physics. The results of two-dimensional simulations are provided to corroborate the analytical models and give greater insight into the device operation."

"Industri Telekomunikasi terus berkembang, ditandai dengan masih terus dilakukan pembangunan infrastruktur telekomunikasi. DC Power Supply yang mencakup Rectifier dan Battery dibutuhkan untuk memberikan catuan DC bagi perangkat Telekomunikasi. PT. Tricipta adalah pemasok DC Power Supply bagi operator dan vendor telekomunikasi.Penjualan PT. Tricipta pada tahun 2009, yang menurun 17% dibanding tahun 2008 merupakan tantangan bagi PT. Tricipta untuk mencari strategi bersaing dalam bisnis DC Power Supply agar mampu bertahan dan meningkatkan pendapatan perusahaan. Dari hasil analisa kompetitif DC Power Supply Tricipta dengan menggunakan model Porter 5 Forces didapatkan bahwa DC Power Supply Tricipta memiliki potensi kompetitif yang MEDIUM.Dari hasil analisa SWOT didapatkan DC Power Supply Tricipta berada di kuadran 1 sehingga strategi yang sesuai adalah bertumbuh dan agresif. Sedangkan berdasarkan analisa Internal Eksternal DC Power Supply Tricipta berada di sel 5 yaitu strategi pertumbuhan yang horizontal.Berdasarkan metode QSPM strategi bersaing yang paling menarik bagi DC Power Supply Tricipta adalah Pengembangan Produk dengan menambah fitur perangkat berupa nilai tambah, mencari mitra baru untuk battery dari China, menjual Renewable Energy dan masuk dalam bisnis Sewa Daya, membangun Research and Development Center, merekrut karyawan baru untuk Renewable Energy serta memberikan pelatihan pada karyawan internal untuk produk-produk baru.

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Telecommunication Industry keep growing up, it is proven with contruction of telecommunication insfrasturcture still continue. DC Power Supply that consist of Rectifer and Battery needed to supply DC power for Telecommunication equipment. PT. Tricipta is Distributor of DC Power Supply for Telecommunication provider and vendor.Sales of PT. Tricipta during year 2009, decrease 17% compare to year 2008 and this is became challenge for PT. Tricipta to find out competitive strategic in DC Power Supply business to keep survive and gain company revenue.From the Competitive Analysis result for DC Power Supply Tricipta using Porter 5 Forces method, obtained that DC Power Supply Tricipta has MEDIUM competitive competency. From SWOT analysis, it is obtained that DC Power Supply Tricipta is placed at quadrant 1, then it should be supported with growth oriented and agressive strategy. Meanwhile base on Internal Eksternal analysis DC Power Supply Tricipta locate at cell 5 that should be supported with horizontal growth strategy.Base on QSPM method the most attractive competitive strategy is Product Development with adding feature as value added, find new partner for China battery, provide Renewable Energy product, enter Rental Power business, built Research and Development Center, recruiting new employee for Reneweable Energy and train current employee for new Product."

"ABSTRAKTelah dibuat SRC 3 fase dengan penyearah voltage doubler. SRC tersebut memiliki spesifikasi tegangan masukan 520VDC, tegangan keluaran 600VDC dan daya maksimum 2kW. SRC tersebut dikendalikan dengan algoritma kontrol soft start dan kontrol PI menggunakan mikrokontroler TMS320F28027. Pada pengujian secara open loop memiliki rentang error sebesar 2 hingga 2.2 . Pada pengujian secara close loop memiliki rentang error sebesar 7 hingga 9 .

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ABSTRACTThree phase series resonant converter with voltage doublers rectifier had been made. It had the spesification such as 520VDC input voltage, 600VDC output voltage and 2kW maximum power. The SRC controlled by microcontroller TMS320F28027 with soft start algorithm and PI controller. In opened loop testing, it has 2 until 2.2 of error. In the other hand, it has 7 until 9 of error when it tested in closed loop condition."

"Jahren has built three laboratories in which she's studied trees, flowers, seeds, and soil. She tells about her childhood in rural Minnesota with an uncompromising mother and a father who encouraged hours of play in his classroom's labs; about how she found a sanctuary in science, and the disappointments, triumphs and exhilarating discoveries of scientific work. Yet at the core of this book is the story of a relationship Jahren forged with Bill, who becomes her lab partner and best friend. Their sometimes rogue adventures in science take them over the Atlantic to the ever-light skies of the North Pole and to tropical Hawaii, where she and her lab currently make their home."