Question

Draw the circuit diagram of zener diode as a voltage regulator and briefly explains its working ?

Answer 1

 Zener diode as voltage regulator

• After the break down voltage, a small change in the voltage across the zener diode produces a large change in the current through the circuit.

• If the voltage is increased beyond the zener voltage, then the resistance of the zener diode drops considerably.

• A zener diode and a resistor are connected to a fluctuating DC supply such that the zener diode is reverse biased.

• When the voltage across the diode tends to increase, the current through the diode rises out of proportion and causes a sufficient increase in voltage drop across the resistor. Therefore, the O/P voltage lowers back to normal.