Chapter 12 Current Programmed Control

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Fundamentals of power Electronics1Chapter 12: Current Programmed ControlChapter 12Current Programmed Control + Buck converterCurrent- Programmed controllerRvg(t)is(t)+v(t) iL(t)Q1LCD1+ AnalogcomparatorLatchTs0SRQClockis(t)RfM easureswitchcurrentis(t)RfControlinputic (t)Rf +vrefv(t)CompensatorConventional output voltage controllerSwitchcurrentis(t) Control signalic(t)m1t0dTsTsonoffTransistorstatu s:Clock turnstransistor onComparator turnstransistor offThe peak transistor currentreplaces the duty cycle as theconverter Control of power Electronics2Chapter 12: Current Programmed ControlCurrent Programmed Control vs. duty cycle controlAdvantages of Current Programmed Control : Simpler dynamics inductor pole is moved to high frequency Simple robust output voltage Control , with large phase margin,can be obtained without use of compensator lead networks It is always necessary to sense the transistor Current , to protectagainst overcurrent failures.

Objectives of this section: • Stability analysis ... Fundamentals of Power Electronics 20 Chapter 12: Current Programmed Control The first-order approximation iL(t) Ts ... Fundamentals of Power Electronics 22 Chapter 12: Current Programmed Control Small-signal equations of …

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