L18_diode - ESC102 Introduction to Electronics DC Power...

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DC Power Supply ESC102 : Introduction to Electronics A R. Harish Dept. of EE, IIT Kanpur Sep 7, 2010
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Peak Inverse Voltage V S D N 1 N 2 V O C R L - + V M M V PIV = I V
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V S N 1 N 2 R L V O D1 D2 V M + - + - V M OFF γ V V PIV M - = 2
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Peak Inverse Voltage D1 D2 D3 D4 V S V O R L + V M - γ γ γ V V V V V V V M M 2 0 0 3 0 1 - = = + + + - ( 29 γ γ γ γ V V V V PIV V V V V V V M D D - = + = + - = = + + 0 0 2 2 3 0 0 - +
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Zener Diode + V Z - I Z I V |V Z | A diode specially designed to operate in reverse bias and in ‘breakdown’ region + V Z - I Z V Z Off State V γ
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Model + V Z - I Z V Z Example
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Model + V Z - I Z V Z
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Zener diode: Important Characteristics I V |V Z | Z V (max.) Z I (min.) Z I Z P
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Voltage Reference Circuit R i V PS V L + V Z - R L R i V PS V L + V Z - R L
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Power supply with regulator R i V PS V L + V Z - R L D V S C R L V ps
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Zener diode as Voltage Regulator V S N 1 N 2 D1 D2 R L C V O V S N 1 N 2 D1 D2 V O C R L R i
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V S N 1 N 2 D1 D2 V O C R L R i
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Voltage Reference Circuit V S N 1 N 2 D1 D2 V O C R L R i Design Problem: Determine R i and zener diode specifications such that output voltage is +12V, load current can vary between 0 to 0.1A. The input voltage may vary between 18 to 15.5V. R i V PS V L + V Z - R L I L I Z I I
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R i V PS V L +
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  • Spring '10
  • A.R.Harish
  • Volt

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