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9/28/2011
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DC to DC converterKuliah 5
Aripriharta
Aripriharta
Konsep Chopper
• Mengubah tegangan dc yang besarnya tetap menjaditegangan dc yang besarnyadapat diubah-ubah
• Disebut juga dc regulator atauchooper
• Komponen Utama:
–BJT/MOSFET/IGBT
–SCR/GTO
• Kontrol:
–PWM
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Aplikasi chopper
• Switched-mode power supply (SMPS)
• DC motor control
• Batere charger
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Block Diagram Chopper
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Topologi Chopper
• Tanpa Trafo switching (non-isolated)
– Buck
– Boost
– Buck-Boost
– Cûk
– CCM SEPIC
• dengan Trafo switching (Isolated)
– Forward converter
– Flyback Converter
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Review Regulator Linier
• BJT dioperasikanpada daerahliniernya
• Tegangankeluarannya
• BJT dapatdirepresentasikan sebagairesistor varibel
• Rugi-rugi dayabesar.
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Switching regulator (Chopper)
• BJT dioperasikansebagai saklar(switch)
• Rugi-rugi dayadapat diabaikan(saklar ideal rugidaya = 0)
• 100% daya yang dikirimkan olehsumber akanditerima olehbeban.
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Buck Converter
• Fungsi:
–Menurunkan tegangan masukkan kelevel tertentu tergantung padadutycycle dari pulsa gatenya.
• Rangkaian Konverter Buck:
Biasanya menggunakanBJT, MOSFET/IGBT
bebanbuck
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Prinsip Kerja Konverter Buck
ON
OFF
D
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Circuit operation when switch is turned on (closed)
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Analysis for switch closed
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Operation when switch turned off (opened)
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Analysis for switch opened
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Steady-state operation
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Arus Induktor
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Output voltage ripple
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Continuous current operation
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Gelombang Konverter Buck
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Design procedures for Buck
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Design procedures for Buck
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Examples of Buck converter
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Contoh RangkaianKonverter Buck
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Prinsip Kerja PWM
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Contoh Rangkaian PembangkitSinyal PWM
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IC PWM
• LM/UC/UG/SG/KA 3524/3525
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Block diagram SG3524
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Implementasi IC PWMpada Buck Converter
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Implementasi IC PWMpada Buck Converter
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Implementasi IC PWMpada Buck Converter
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References
• Slides:
– Chapter 3 DC to DC CONVERTER (CHOPPER) : F. rahman
– Lecture 12 - DC-DC Buck Converter: F. rahman
• Applications of the LM3524Pulse-Width-Modulator: National Semiconductor Application Note 292 April 1998
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Selanjutnya …
• Boost Converter ….
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