Slide điện tử tương tự chapter 1 diodes and applications

PRACTICAL Diode CuuDuongThanCong.com https://fb.com/tailieudientucntt cuu duong than cong... PRACTICAL Diode - multimeter CuuDuongThanCong.com https://fb.com/tailieudientucntt cuu duong

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Electronics Circuits I Chapter 1: Diodes and applications

Dr Pham Nguyen Thanh Loan

Ha Noi, 21/8/2013

CuuDuongThanCong.com https://fb.com/tailieudientucntt

cuu duong than cong com

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Chapter 1: Diode & applications

Contents

 Diode – Structure, operation and equivalent circuit

 Rectifiers circuits

 Limiters circuits

 Double voltage and so on

 Zener diode and its applications

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Diode structure

 PN Junction

 Depletion region: no carriers

 Ion located at the interfaces with P/N  barrier voltage V D  drift current I S (i drift )

 Diffusion phenomenon: flow of charges from high concentration region to lower concentration region  I D (i diff )

 Equilibrium of PN junction: Is + I D = 0

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PN junction and its symbol: Diode

Kathode (K) Anode (A)

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Model of ideal diode

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Model of practical diode (VD ≠ 0)

 FORWARD BIAS : applied voltage > V D

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PRACTICAL Diode

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PRACTICAL Diode

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PRACTICAL Diode (VD ≠ 0)

0.3(Ge) 0.7(Si)

(Ge) (Si)

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PRACTICAL Diode

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PRACTICAL Diode - multimeter

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PRACTICAL Diode - multimeter

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Large signal model

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Small signal model

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Rectifiers

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Half wave

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Half wave: 1 st half positive periode

 Diode: OFF, I D =0

 V out = 0

 Diode: ON

 V out = V in - V D

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Half wave with transformer

 Example: Analyze the following circuit

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Fullwave rectifier

Waveform of input and output signal

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Fullwave rectifier: schematic

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Fullwave rectifier: operation

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Determine PIV

 PIV = V P(sec) + 0.7V

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Ex: Determine PIV

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Bridge rectifier

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Bridge rectifier

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PIV = V P(OUT) + 0.7V

Bridge rectifier

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Bridge rectifier

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Filters

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Roles of Capacitor

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 Input: Sinusoidal waveform, imput f: 60Hz

Output frequency

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 Ripples observed on output signals

Same filter cap, load and input signal

Ripple consideration

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A supply voltage

 Used in most electronics devices

 Simple, cheap and easy to construct

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Limiters

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Different operation of diodes

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Similar Zener diode operation

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Limiters associated with voltage divider

Ex: Analyze this circuit

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 Resistor and capacitor are chosen how to

guarantee a τ = RC big enough so that the

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R Vo

-+ -

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Results from Circuit Maker

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Results from Circuit Maker

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Positive Clamp circuit

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Negative clamp circuit

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Negative clamp circuit

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voltage doubler

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voltage doubler

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Triple voltage

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Mạch nhân bốn

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Supply voltage

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Signals at different nodes

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Signals at different nodes

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Homeworks

37, 42, 47, 49, 52

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