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DC Power supply

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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DC Power supply

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  1. DC Power supply AC ~ 110V ±10% 60 Hz DC Vout RL

  2. AC ~ 110V ±10% 60 Hz DC out ? RL

  3. 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

  4. Vin Vout = VZ – 0.6 V I max = *I RS Ib VZ Add an emitter follower I

  5. A convention Vin I RS Ib VZ

  6. Adjustable Vout Vin I RS

  7. R3 + R4 VBE R4 Using feedback Vout = +Vin Vout R1 R3 R4

  8. R3 + R4 (VBE + Vz) R4 Improvement Vout = +Vin Vout R1 R3 R4

  9. R4 Current limiting +Vin Vout

  10. R2 + R3 VZ R3 Using an op. amp. Vout = +Vin R2 R1 R3 VZ

  11. 2 1 V+ in LM78 XX 3 Available XX : 05, 08, 09, 10, 12, 15, 18, 24 (V), and etc.

  12. V- out V- in LM79 XX

  13. Vout Vin LM117/317

  14. n n p p Transistors A review of JFET n p

  15. - + + + n + + + - Transistors MOSFET D G S - + - + SiO2 Al n-Si

  16. +Vin Vout = R3 + R4 VBE R4 R1 Vout R3 R4

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