fontes de tensão 4
DESCRIPTION
Fontes de TensãoTRANSCRIPT
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Fontes
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Fontes
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Fontes Em uma caixa dagua, consumindo dentro de
certa faixa, temos o nvel da gua constante. Como obter isso? Resposta: Elemento de controle
Boia
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Fontes
Fonte de Tenso
Tenso permanece constante
Fonte de corrente
Corrente permanece constante
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Estagios de uma Fonte de Tenso
Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8e
Copyright 2002 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 18-1 Block diagram showing parts of a power supply.
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Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8e
Copyright 2002 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 18-2 Filter voltage waveform showing dc and ripple voltages.
Tenso de sada filtrada. Tenso CC e Ripple.
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Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8e
Copyright 2002 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458
All rights reserved.
Ondulao
OBS: Tenso de ondulao somente a componente ac da tenso, ou seja, o que se obtem da forma de onda aps subtrair o valor cc. Ento Vr(rms) o valor RMS das componentes de tenso ac (e no da forma de onda completa com a componente cc).
r = valor eficaz (rms)do componente ca do sinalvalormdio do sinal
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Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8e
Copyright 2002 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458
All rights reserved.
Ondulao
Pobre
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Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8e
Copyright 2002 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458
All rights reserved.
Ondulao
Melhor
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Caso de Real de Uso
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Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8e
Copyright 2002 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458
All rights reserved.
Regulao
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Filtro a Capacitor
Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8e
Copyright 2002 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 18-3 Simple capacitor filter.
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Retificador de onda completa sem capacitor de filtro
Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8e
Copyright 2002 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 18-4a Capacitor filter operation: full-wave rectifier voltage.
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Retificador de onda completa sem capacitor de filtro
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Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8e
Copyright 2002 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458
All rights reserved.
Retificador de onda completa com capacitor de filtro
FIGURE 18-4b Capacitor filter operation: filtered output voltage.
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Tenso de saida e corrente nos diodos retificadores - Capacitor pequeno
Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8e
Copyright 2002 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 18-7a Output voltage and diode current waveforms: small C.
Corrente pequena
Riple grande
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Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8e
Copyright 2002 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458
All rights reserved.
Tenso de saida e corrente nos diodos retificadores - Capacitor Grande
FIGURE 18-7b Output voltage and diode current waveforms: large C.
Riple pequeno
Corrente grande
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Tenso de sada aps capacitor de filtro de onda completa retificada.
Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8e
Copyright 2002 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 18-5b Capacitor filter: output voltage waveform.
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Aproximao da tenso de sada aps capacitor de filtro de onda completa retificada.
Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8e
Copyright 2002 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 18-6 Approximate output voltage of capacitor filter circuit.
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Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8e
Copyright 2002 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458
All rights reserved.
Tenso RMS
Tenso CC
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EXEMPLOCalculo do Valor RMS de sada de retificador
de onda completa com capacitor:
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EXEMPLO:Calculo do Valor CC de sada de retificador
de onda completa com capacitor:
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Essa ripple seria permitido para carregar uma bateria chumbo
acida em flutuao?
Ondulao = 100* 1,2/27.9 = 4.3% > 0.5% => NO OK
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Resumo (Boylestad - cap18)
Estgios de uma fonte de tenso
Ondulao (ripple)
Regulao de tenso
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Resumo (Boylestad - cap18)
Estgios de uma fonte de tenso
Ondulao (ripple)
Regulao de tenso
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Resumo (continuao)
Tenso RMS
Tenso CC
Filtro a capacitor
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Estagio de Filtro Adicional
Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8e
Copyright 2002 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 18-8 RC filter stage.
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Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8e
Copyright 2002 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458
All rights reserved.
Estagio de Filtro (adicional)
FIGURE 18-9 Full-wave rectifier and RC filter circuit.
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FIGURE 18-10 (a) DC and (b) ac equivalent circuits of RC filter.
Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8e
Copyright 2002 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458
All rights reserved.
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Reguladores de Tenso
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Regulador Srie
Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8e
Copyright 2002 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 18-12 Series regulator block diagram.
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Circuito Regulador Srie
Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8e
Copyright 2002 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 18-13 Series regulator circuit.
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Circuito Regulador Srie
Vb = Vz => ~ constante Vo Vbe I Vo Vo Vbe I Vo
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Exemplo 18.8 (Boylestad cap 18)
Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8e
Copyright 2002 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 18-14 Circuit for Example 18.8.
Calcule a tenso de sada e a corrente no zener do circuito regulador abaixo, para R
L = 1Kohm.
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Regulador tipo srie aperfeioado
Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8e
Copyright 2002 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 18-15 Improved series regulator circuit.
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EXEMPLO 18.10 (Boylestad cap 18)
Qual a tenso regulada de sada fornecida pelo circuito da figura com os seguitnes elementos:R1 = 20Kohm, R2 = 30Kohm, Vz = 8.3V ?
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Regulador Tipo Srie om Amp-op
Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8eCopyright 2002 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458All rights reserved.
FIGURE 18-16 Op-amp series regulator circuit.
Amp-op com realimentao negativa: V+ = V
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Amp-op com realimentao negativa: V+ V
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Ento VR2
= Vz
Vo = (Vz / R2)(R1 + R2)
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EXEMPLO 18.10
Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8e
Copyright 2002 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 18-17 Circuit for Example 18.10.
Calcule Vo.
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Resumo
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Relembrando:Regulador Srie
Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8e
Copyright 2002 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 18-12 Series regulator block diagram.
Atuador em srie
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Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8e
Copyright 2002 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458
All rights reserved.
Regulao de Tenso em Paralelo
FIGURE 18-20 Block diagram of shunt voltage regulator.
Atuador Em
paralelo
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FIGURE 18-21 Transistor shunt voltage regulator.
Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8e
Copyright 2002 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458
All rights reserved.
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Serie x Paralelo
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Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8e
Copyright 2002 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 18-22 Circuit for Example 18.11.
EXEMPLO 18.11
Determine a tenso regulada (Vo) e as correntes (IL, IC e IS) para o circuito abaixo.
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Serie x Paralelo
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Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8e
Copyright 2002 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458
All rights reserved.
EXEMPLO 18.11
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Regulador Tipo Paralelo Aperfeioado
Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8e
Copyright 2002 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 18-23 Improved shunt voltage regulator circuit.
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Regulador de Tenso Tipo Paralelo Utilizando Amp-op
Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8e
Copyright 2002 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 18-24 Shunt voltage regulator using op-amp.
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Regulador de Tenso Utilizando Amp-opSrie X Paralelo
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CIs Reguladores de Tenso
Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8e
Em um nico CI Referncia; Amplificador Comparador; Dispositivo de controle; Proteo contra sobrecarga
Tipos Tenso fixa Tenso ajustavel De mW a dezenas de Watts.
FIGURE 18-26 Connection of 7812 voltage regulator.
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Regulador de Tenso de Trs Terminais
Entrada:- Faixa de Tenso de operao
FIGURE 18-27 + 12 V power supply.
Sada:- Faixa de corrente de operao- Regulao de linha- Regulao de carga
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FIGURE 18-28 Specification sheet data for voltage regulator Ics.
Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8e
Copyright 2002 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458
All rights reserved.
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Fonte Completa
Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8e
Copyright 2002 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 18-29 +5-V power supply.
Exerccio:Desenhe uma fonte de tenso utilizando um retificador em ponte de onda completa, um filtro a capacitor e um CI regulador para uma sada de 5V.
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Regulador de Tenso Ajustavel
Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8e
Copyright 2002 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 18-30 Connection of LM317 adjustable-voltage regulator.
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LM317
Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8e
Tenso de sada regulada, ajustada entre 1,2V e 37V
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LM317
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Exemplo 18.15
Determine a tenso regulada no circuito, com R1= 240ohm e R2 = 2.4Kohm
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FIGURE 18-31 Positive adjustable-voltage regulator for Example 18.16.
Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8e
Copyright 2002 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458
All rights reserved.
D1 protege contra curto na entradaD2 protege contra curto na sada.
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FIGURE 18-37b Battery charger circuits. (Continued)
Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8e
Copyright 2002 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458
All rights reserved.
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Regulador Srie com limitador de corrente
Robert L. Boylestad and Louis NashelskyElectronic Devices and Circuit Theory, 8e
Copyright 2002 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458
All rights reserved.
FIGURE 18-19 Foldback-limiting series regulator circuit.
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Fontes Fixas x Ajustaveis
Vz = 5V, R2 = 10KohmCalcule R1 para ter 10V na sadaCalcule R1 para ter 15V na sada
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Fontes Fixas x Ajustveis
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Fonte Simtrica
Slide 1Slide 2Slide 3Slide 4FIGURE 18-1 Block diagram showing parts of a power supply.FIGURE 18-2 Filter voltage waveform showing dc and ripple voltages.Slide 7Slide 8Slide 9Slide 10Slide 11FIGURE 18-3 Simple capacitor filter.FIGURE 18-4a Capacitor filter operation: full-wave rectifier voltage.Slide 14FIGURE 18-4b Capacitor filter operation: filtered output voltage.FIGURE 18-7a Output voltage and diode current waveforms: small C.FIGURE 18-7b Output voltage and diode current waveforms: large C.FIGURE 18-5b Capacitor filter: output voltage waveform.FIGURE 18-6 Approximate output voltage of capacitor filter circuit.Slide 20Slide 21Slide 22Slide 23Slide 24Slide 25Slide 26FIGURE 18-8 RC filter stage.FIGURE 18-9 Full-wave rectifier and RC filter circuit.FIGURE 18-10 (a) DC and (b) ac equivalent circuits of RC filter.FIGURE 18-12 Series regulator block diagram.Slide 31FIGURE 18-13 Series regulator circuit.Slide 33FIGURE 18-14 Circuit for Example 18.8.Slide 35FIGURE 18-15 Improved series regulator circuit.Slide 37FIGURE 18-16 Op-amp series regulator circuit.FIGURE 18-17 Circuit for Example 18.10.Slide 40Slide 41FIGURE 18-20 Block diagram of shunt voltage regulator.FIGURE 18-21 Transistor shunt voltage regulator.Slide 44FIGURE 18-22 Circuit for Example 18.11.Slide 46Slide 47FIGURE 18-23 Improved shunt voltage regulator circuit.FIGURE 18-24 Shunt voltage regulator using op-amp.Slide 50FIGURE 18-26 Connection of 7812 voltage regulator.FIGURE 18-27 + 12 V power supply.FIGURE 18-28 Specification sheet data for voltage regulator Ics.Slide 54FIGURE 18-29 +5-V power supply.FIGURE 18-30 Connection of LM317 adjustable-voltage regulator.Slide 57Slide 58Slide 59FIGURE 18-31 Positive adjustable-voltage regulator for Example 18.16.FIGURE 18-37b Battery charger circuits. (Continued)FIGURE 18-19 Foldback-limiting series regulator circuit.Slide 63Slide 64Slide 65