tailieunhanh - Circuits & Electronics P24

Power Conversion Circuits and Diodes Fall 2000 Lecture 24 1 .Power Conversion Circuits (PCC) PCC 110V 60Hz + – 5V DC solar cells, battery 3V DC PCC + – 5V DC DC-to-DC UP converter Power efficiency of converter important, so use lots of devices: MOSFET switches, clock circuits, inductors, capacitors, op amps, diodes R Reading: Chapter 16 and of A & L. Fall 2000 Lecture 24 2 .First, let’s look at the diode iD + vD – v ⎛ VD ⎞ ⎜ e T − 1⎟ iD = I S ⎜ ⎟ ⎠ ⎝ I S = 10 −12 A VT = Boltzmann’s constant temperature in Kelvins charge of an electron kT VT = q iD iD − IS vD mV vD V Can use this exponential. | CIRCUITS AND ELECTRONICS Power Conversion Circuits and Diodes Fall 2000 Lecture 24 1 Power Conversion Circuits PCC PCC 5V DC 110V 60Hz solar cells X 3V battery y DC PCC 5V DC DC-to-DC UP converter Power efficiency of converter important so use lots of devices MOSFET switches clock circuits inductors capacitors op amps diodes Reading Chapter 16 and of A L. Fall 2000 Lecture 24 2 First let s look at the diode iD O I Y VD Vd Ï iD Is eVT -1 I J IS 10 S 12 A VT kT Boltzmann s constant VT - temperature in Kelvins VD V Can use this exponential model with analysis methods learned earlier analytical graphical incremental Our fake expodweeb was modeled after this device Fall 2000 Lecture 24