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DC Power supply - PowerPoint PPT Presentation


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DC Power supply. AC ~ 110V ± 10% 60 Hz. DC V out. R L. AC ~ 110V ± 10% 60 Hz. DC out. ?. R L. Zener diode shunt voltage regulator. V in. I = (V in -V z ) /R s. R S. Drawbacks: Heat V z fixed. V out = V Z. Example: V in = 12 V V z = 6 V I = 1 A W = 12 w. V Z. V in.

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Presentation Transcript
slide1

DC Power supply

AC ~

110V ±10%

60 Hz

DC Vout

RL

slide2

AC ~

110V ±10%

60 Hz

DC out

?

RL

slide3

Zener diode shunt voltage regulator

Vin

I = (Vin-Vz) /Rs

RS

  • Drawbacks:
  • Heat
  • Vz fixed

Vout = VZ

Example:

Vin = 12 V

Vz = 6 V

I = 1 A

W = 12 w

VZ

slide4

Vin

Vout = VZ – 0.6 V

I max = *I

RS

Ib

VZ

Add an emitter follower

I

slide5

A convention

Vin

I

RS

Ib

VZ

slide7

R3 + R4

VBE

R4

Using feedback

Vout =

+Vin

Vout

R1

R3

R4

slide8

R3 + R4

(VBE + Vz)

R4

Improvement

Vout =

+Vin

Vout

R1

R3

R4

slide9

R4

Current limiting

+Vin

Vout

slide10

R2 + R3

VZ

R3

Using an op. amp.

Vout =

+Vin

R2

R1

R3

VZ

slide11

2

1

V+ in

LM78 XX

3

Available XX :

05, 08, 09, 10, 12, 15, 18, 24 (V), and etc.

slide12

V- out

V- in

LM79 XX

slide13

Vout

Vin

LM117/317

slide14

n

n

p

p

Transistors

A review of JFET

n

p

slide15

-

+

+

+

n

+

+

+

-

Transistors

MOSFET

D

G

S

-

+

-

+

SiO2

Al

n-Si

slide16

+Vin

Vout =

R3 + R4

VBE

R4

R1

Vout

R3

R4