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9/28/2011

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DC to DC converterKuliah 5

Aripriharta

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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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9/28/2011

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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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9/28/2011

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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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