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# lect5 - AERO ASTRO 16.682 Prototyping Avionics Spring 2006...

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ASTRO AERO 16.682 - Prototyping Avionics Spring 2006 LECTURE 5 LECTURE 5 February 22, 2006 February 22, 2006 DEPARTMENT OF AERONAUTICS AND ASTRONAUTICS Alvar Saenz-Otero Alvar Saenz-Otero

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Outline Power Regulation Transformers Rectifiers Linear Regulators Switching Regulators How much power? Massachusetts Institute of Technology 2 16. 6 82 - Prototyping Avionics
Transformers Exchange voltage for current to reduce potential difference (voltage) across two points The difference in number of turns between the two windings determines the ratio of voltage input to voltage output v 1 = N 1 i 1 T i 2 v 2 N 2 + + i 1 = − N 2 i 2 N 1 v 1 v 2 - v 1 = − i 2 - v 2 i 1 N 1 N 2 Note: no conductive element between v 1 and v 2 ! Massachusetts Institute of Technology 3 16. 6 82 - Prototyping Avionics

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Transformers: Multiple Types + T + T Single-tap One voltage output v Multiple-taps/windings Provide multiple voltage outputs Multiple taps Must share common point Multiple windings Can use in series (like a tap) to get multiple voltages or in parallel to increase current output V+ Vpos 1 v 2 V- - - N 1 N 2 Single Tap Vneg T Vpos V+ T + + v 2 V- V0 v ref v 1 v 3 - - Vneg Center Tap Two Windings configured for +V & -V Massachusetts Institute of Technology 4 16. 6 82 - Prototyping Avionics
given in RMS value, which means the peak is at 1 V pp = V 0.707 ac AC Voltage Plot Rectifiers -1.5 -1 -0.5 0 0.5 1 1.5 0 2 4 6 8 10 12 14 0 V t V ac V ac DC vs AC DC = Direct Current: used in most electronics & batteries + AC = A lternating Current: used during common electricity

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lect5 - AERO ASTRO 16.682 Prototyping Avionics Spring 2006...

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