Zener Diode In A Voltage Regulator Circuit

**Strings (S _{i}P_{j}A_{jk}) = S_{7}P_{7}A_{72} Base Sequence = 12735 String Sequence = 12735 - 7 - 72**

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Zener Diode In A Voltage Regulator Circuit

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*Zener diodes* (symbol in 121.10(a)) are voltage regulator devices. They help to keep the rectifier DC voltage output constant. They are deliberately designed to operate in the *reverse-breakdown region*.

The voltage regulator circuit of figure 121.10(b) has the following characteristics:

Constant reverse breakdown Zener voltage, V_{Z} = 8.2 V.

Allowable range of operational Zener current: 75 mA≤ *i _{Z}* ≤1 A.

Load resistance, R

Size R

**The strings**:
S_{7}P_{7}A_{72} (Dynamic Equilibrium).
**The math**:

Pj Problem of Interest is of type *equilibrium* (dynamic equilibrium). The objective of a Zener diode voltage regulator circuit is to maintain a stable (constant) voltage across a load.

The two most important characteristics of a Zener diode are the Zener voltage and the rated power dissipation. Zener diode behaves like any other reverse-biased diode for variable DC V_{s} ≤ reverse breakdown voltage V_{z}. When V_{s} is > V_{z} (occurrence of *avalanche voltage*), Zener diode will conduct current. This transition point is called the *avalanche point*. Zener voltage is kept constant at and beyond the *avalanche point*. So, load connected in parallel to the Zener diode will have a constant load voltage equal to V_{z} as long as V_{s} is > V_{z}.

Now, by Ohm's law

*i _{L}* = v

By KVL

R

So, sizing R

R

Now, for

So, since

v

The *point* **.** is a mathematical abstraction. It has negligible size and a great sense of position. Consequently, it is front and center in abstract existential reasoning.

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