{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Lecture 8_v2

Lecture 8_v2 - Lecture 8 Diode circuits LEDs photovoltaics...

This preview shows pages 1–5. Sign up to view the full content.

Spring 2011 ECE 2100, A. Molnar, Cornell University 1 Lecture 8 Diode circuits, LEDs, photovoltaics

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Spring 2011 ECE 2100, A. Molnar, Cornell University 2 Some more diodes Ideal diode I V I V Rev. Fwd. Bias Bias Turn-on voltage More realistic I V Turn-on voltage With series R Real diode I V I=I o (exp(V/V T )-1) Real diode with resistor I V + V - I Turn-on V is ~0.7V in Silicon
Spring 2011 ECE 2100, A. Molnar, Cornell University 3 Vout Vin simple diode circuit + Vin - I + Vout - Turn-on V Vin -4 -2 0 2 4 0 2 4 6 8 10 12 14 time Volts Vout -4 -2 0 2 4 0 2 4 6 8 10 12 14 time Volts 2 cases: Vin< Vto Æ I=0, Vout=Vin Diode is an open circuit Vin>Vto Æ Vout = V to , I=(Vin-Vto)/R Diode is a V-source = Vto R Note this is called a “half wave rectifier” : It converts an alternating (AC) signal with zero mean into a signal with non-zero mean Vto

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Spring 2011 ECE 2100, A. Molnar, Cornell University 4 Vout Vin simple diode circuit Turn-on V + Vin - I + Vout - R Vin -4 -2 0 2 4 0 2 4 6 8 10 12 14 time Volts Vout -4 -2 0 2 4 0 2 4 6 8 10 12 14 time Volts Note this is also a “½ wave rectifier” + Vto -
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 7

Lecture 8_v2 - Lecture 8 Diode circuits LEDs photovoltaics...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online