It is connected to the positive terminal of the d.c. Hence, it acts as a voltage regulator. 2. Zener diode. When the minimum input voltage and the maximum load current is applied, the Zener diode current should always be minimum. CO-ED SCHOOL BHOPAL MOTHER TERESA SR. SEC. Ans. A 4V7 zener diode is used as a voltage regulator as shown in the diagram below. This video is extremely helpful for understanding the basic concepts of zener diode, how it works and how it is used as a voltage regulator. Zener diode is connected parallel to the load to make it reverse bias and once the Zener diode exceeds knee voltage, the voltage across the load will become constant. The reason behind this is, an ordinary diode may get damaged if you apply a voltage greater than its breakdown voltage in reverse bias. For example, if you happen to pass a 6V reverse voltage through a diode of 3V, then the measure of voltage across the diode will be 3V only. The action of the circuit can be explained as given below: Load current varies, the input voltage is constant: Let us consider that the load current increases. Ans. Fig 2:Zener diode characteristic curve The forward bias region of a Zener diode is identical to that of a regular diode. Zener diode has the property of behaving like a dc battery in ‘on’ state (i.e. (ii)Explain with the help of a circuit diagram, the use of a Zener diode as a voltage regulator. This silicon semiconductor is designed to function in the condition of reverse bias. Function of Zener Diode in Voltage Regulator Abstract The strength property which we use may not be capable to grant us normal voltage. Zener diode is a silicon semiconductor with a p-n junction that is specifically designed to work in the reverse biased condition. Explain, giving reason. Furthermore, you must refer to the image below to see how Zener diode can be used as voltage regulator. When the input voltage is less than the breakdown voltage (V z), very small current flows through the diode and the whole input appears across the output terminals. (Actually, to be certain the zener diode could handle the power, I placed two 12 volt zeners in parallel. regulation is to be made. 3 Zener diode applications. Here, in this circuit the input voltage V i is regulated at a constant voltage, V z (Zener voltage) at the output represented as V 0 using a Zener diode. Zener diode as a voltage regulator: The function of a regulator is to provide a constant output voltage to a load connected in parallel with it in spite of the ripples in the supply voltage or the variation in the load current and the zener diode will continue to regulate the voltage until the diodes current falls below the minimum I Z(min) value in the reverse breakdown region. The Zener diode specially made to have a reverse voltage breakdown at a specific voltage. Zener diodes are widely used as voltage references and as shunt regulators to regulate the voltage across small circuits. The current flows without much restriction while there can be a voltage drop of about 0.3 to 0.7 Volts. Zener diode as a voltage regulator. (iii)A photo diode is operated under reverse bias although in the forward bias, the current is known to be more than the current in the reverse bias. The exciting part of this diode is that we can choose the Zener diode with a suitable breakdown voltage to work as a voltage regulator in our circuit. I clamped the voltage of the transformer with a 12 volt zener diode and the crosstalk problem disappeared. Refer to the voltage reference circuit to set the resistance R 1. Zener Diode as a Voltage Regulator. Let us say if Zener voltage of 5 V is used then, the voltage becomes constant at 5 V, and it does not change. Hence, VZ = VL. The zener diode will continue in regulating the voltage till the zener diode current falls below the minimum I z min value in the reverse breakdown region. when the voltage across the zener diode exceeds its zener voltage rating VZ) . Furthermore, choosing a Zener diode becomes easy as the required output voltage and the input voltage is known from the beginning. The voltage drop across R L is 12 V, V in has values between 20 V and 35 V. The minimum current through R However, this would not be possible with a standard diode. Due to this feature, it is used as a voltage regulator in d.c. circuit. In this video, let's explore how a Zener diode can be used to regulate voltage. Figure 2 shows the current versus voltage curve for a Zener diode. Here is a link to step by step physics experiment of Zener diode as a voltage regulator and how its made. Video. Pro Lite, Vedantu Theory. 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