Tài liệu Circuits & Electronics P24 pptx

6.002 Fall 2000 Lecture 1 24 6.002 CIRCUITS AND ELECTRONICS Power Conversion Circuits and Diodes 6.002 Fall 2000 Lecture 2 24 Power Conversion Circuits (PCC) Power efficiency of converter important, so use lots of devices: MOSFET switches, clock circuits, inductors, capacitors, op amps, diodes Reading: Chapter 16 and 4.4 of A & L. PCC 110V 60Hz + – 5V DC solar cells, battery PCC + – 5V DC 3V DC DC-to-DC UP converter R 6.002 Fall 2000 Lecture 3 24 First, let’s look at the diode Can use this exponential model with analysis methods learned earlier  analytical  graphical  incremental (Our fake expodweeb was modeled after this device!) D v D i D v D i S I− mV V D v + – D i ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ −= 1eIi T D V v SD A10I 12 S − = V025.0V T = q Tk V T = Boltzmann’s constant temperature in Kelvins charge of an electron 6.002 Fall 2000 Lecture 4 24 Another analysis method: piecewise–linear analysis P–L diode models: D v D i 0 Ideal diode model Æ i D = 0 “open” or off v D < 0 Æ v D = 0 “short” or on i D ≥ 0 6.002 Fall 2000 Lecture 5 24 D v D i V6.0 0v D = 0i D = “Practical” diode model ideal with offset V6.0 + – Another analysis method: piecewise–linear analysis Open segment Short segment 6.002 Fall 2000 Lecture 6 24 Another analysis method: piecewise–linear analysis  Replace nonlinear characteristic with linear segments.  Perform linear analysis within each segment. Piecewise–linear analysis method 6.002 Fall 2000 Lecture 7 24 (We will build up towards an AC-to-DC converter) R O v + – + – I v V6.0 + – Example Consider v I is a sine wave 6.002 Fall 2000 Lecture 8 24 0v O = 0i D = “Open segment”: R + – I v + – + – V6.0 6.0v I < R O v + – + – I v () R/6.0vi ID −= 6.0vv IO −= “Short segment”: R + – + – + – V6.0 6.0v I ≥ I v Example V6.0 + – Equivalent circuit 6.002 Fall 2000 Lecture 9 24 Example t 6.0 I v O v 6.002 Fall 2000 Lecture 10 24 Now consider — a half-wave rectifier I v R O v + – + – V6.0 + – C . 2000 Lecture 1 24 6.002 CIRCUITS AND ELECTRONICS Power Conversion Circuits and Diodes 6.002 Fall 2000 Lecture 2 24 Power Conversion Circuits (PCC) Power. of devices: MOSFET switches, clock circuits, inductors, capacitors, op amps, diodes Reading: Chapter 16 and 4.4 of A & L. PCC 110V 60Hz + – 5V DC solar