전자회로 넷째주 1강 - contents.kocw.netcontents.kocw.net/KOCW/document/2015/korea_sejong/ahnsangsik1/06.pdf · Figure 3.31 The “superdiode” precision half-wave rectifier

전자회로I

넷째주 1강

Chapter 3

Lecture Homepage : http://signal.korea.ac.kr

Signal Processing Lab., http://signal.korea.ac.krDept. of Elec. and Info. Engr., Korea Univ.

2016년 6월 27일2 pages

3.3) Modeling The Diode Forward CharacteristicSummary

Chapter 3




3.4) Operation In The Reverse Breakdown Region- Zener Diodes

Figure 3.20 Circuit symbol for a zener diode.

Figure 3.21 The diode i–v characteristic with the breakdown region shown in some detail.

Chapter 3




3.4) Operation In The Reverse Breakdown Region- Zener Diodes

Figure 3.22 Model for the zener diode.

0V V (3.20)Z Z z Zr I

Chapter 3




3.5) Rectifier Circuits

Figure 3.24 Block diagram of a dc power supply.

Chapter 3




3.5) Rectifier CircuitsThe Half-Wave Rectifier

00, <V (3.21a)O S D

0 0V , V (3.21b)O S D S DD D

R RR r R r

Figure 3.25 (a) Half-wave rectifier. (b) Equivalent circuit of the half-wave rectifier with the diode replaced with its battery-plus-resistance model. (c) Transfer characteristic of the rectifier circuit. (d) Input and output waveforms, assuming that rD ! R.

PIV = Vs

Chapter 3





(3.22) V 00 Dsvv

In many applications, rD<<R and the second equation can be simplified to


Chapter 3






Chapter 3




3.5) Rectifier CircuitsThe Full-Wave Rectifier

Figure 3.26 Full-wave rectifier utilizing a transformer with a center-tapped secondary winding: (a) circuit; (b)transfer characteristic assuming a constant-voltage-drop model for the diodes; (c) input and output waveforms.

PIV = 2V Vs D

Chapter 3




3.5) Rectifier CircuitsThe Bridge Rectifier

Figure 3.27 The bridge rectifier: (a) circuit; (b) input and output waveforms.

PIV = V 2V V V Vs D D s D

3 2(revers) = + (forward)D O D

Chapter 3




3.5) Rectifier CircuitsThe Rectifier with a Filter Capacitor

Figure 3.28 (a) A simple circuit used to illustrate the effect of a filter capacitor. (b) Input and output waveforms assuming an ideal diode. Note that the circuit provides a dc voltage equal to the peak of the input sine wave. The circuit is therefore known as a peak rectifier or a peak detector.

The Peak Rectifier(Detector)

Chapter 3




/ (3.23)L Oi R

(3.24)

(3.25)

D C L

IL

i i id

C idt


The Peak Rectifier

Figure 3.29 Voltage and current waveforms in the peak rectifier circuit with CR >> T. The diode is assumed ideal.

Chapter 3





The Peak Rectifier

VV (3.33)

2p

r fCR

(1 V / 2V ) (3.34)Dav L p ri I

max (1 2 V / 2V ) (3.35)D L p ri I

Figure 3.30 Waveforms in the full-wave peak rectifier.

Chapter 3




3.5) Rectifier CircuitsPrecision Half-Wave Rectifier

The Super Diode

Figure 3.31 The “superdiode” precision half-wave rectifier and its almost-ideal transfer characteristic. Note that when vI > 0 and the diode conducts, the op amp supplies the load current, and the source is conveniently buffered, an added advantage. Not shown are the op-amp power supplies.

0O I I

Chapter 3




3.5) Limiting and Clamping CircuitsLimiter Circuits

Figure 3.32 General transfer characteristic for a limiter circuit.

Figure 3.33 Applying a sine wave to a limiter can result in clipping off its two peaks.

Chapter 3




3.5) Limiting and Clamping CircuitsLimiter Circuits

Figure 3.35 A variety of basic limiting circuits.

Chapter 3




3.5) Limiting and Clamping CircuitsThe Clamped Capacitor or DC Restorer

Figure 3.36 The clamped capacitor or dc restorer with a square-wave input and no load.

+ O I C

Chapter 3




Figure 3.37 The clamped capacitor with a load resistance R.

3.5) Limiting and Clamping CircuitsThe Clamped Capacitor or DC Restorer

Chapter 3




3.5) Limiting and Clamping CircuitsThe Voltage Doubler

Figure 3.38 Voltage doubler: (a) circuit; (b) waveform of the voltage across D1.

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전자회로 넷째주 1강 - contents.kocw.netcontents.kocw.net/KOCW/document/2015/korea_sejong/ahnsangsik1/06.pdf · Figure 3.31 The “superdiode” precision half-wave rectifier