Sorry!, This page is not available for now to bookmark. Funded by MeitY (Ministry of Electronics & Information Technology) English हिंदी മലയാളം मराठी . When the Zener diode is given reverse bias feedback, there is a small leakage current until it attains the breakdown voltage or a constant voltage. Thus we will connect the zener diode parallel to the load such that the applied voltage will reverse bias it. Zener diodes are used in circuits to maintain a fixed voltage across a load. Its property of breakdown voltage which we have discussed earlier plays a key role in voltage regulation. you are here->home->Physics->Class 12->Zener Diode. Observe the nearly constant voltage in the breakdown region. In this video, let's explore how a Zener diode can be used to regulate voltage. 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. It can be understood how a zener diode acts as a voltage regulator by analyzing the below circuit. A 5 V stabilized power supply is required to be produced from a 12 V DC power supply input source. When connected in parallel with a variable voltage source so that it is reverse biased, a Zener diode conducts when the voltage reaches the diode's reverse breakdown voltage. Theory. Zener diode as voltage regulator. Similarly, the current through the diode decreases when the voltage across the diode tends to decrease. When the breakdown occurs in Rectifier as well as Zener diode, it is known as Zener breakdown. This voltage at which seamless current flow begins is known as the breakdown voltage. A Zener diode is used to get constant DC voltage from a DC unregulated output of a rectifier. It works in such a way the reverse-biased can also work in breakdown conditions. Zener Diodes have a sharp reverse breakdown voltage and breakdown voltage will be constant for a wide rang of currents. This silicon semiconductor is designed to function in the condition of reverse bias. Let us say if Zener voltage of 5 V is used then, the voltage becomes constant at 5 V, and it does not change. There is a series resistor connected to the circuit in order to limit the current into the diode. Design a Zener diode voltage regulator circuit as shown in Fig. (i)Zener diode is used as voltage regulator. A Zener diode can limit the voltage across it, making it a voltage regulator! Why is zener diode used as a voltage regulator? When forward biased, it behaves like a normal signal diode, but when the reverse voltage is applied to it, the voltage remains constant for a wide range of currents. Zener diode. How Zener Diode Act as a Voltage Regulator? The resistance box is connected as load across the zener diode and the regulated voltage across it is measured using the multimeter. To keep the output voltage constant at the desired value in spite of variations in the supply voltage. Due to this feature, it is used as a voltage regulator in d.c. circuit. when the voltage across the zener diode exceeds its zener voltage rating VZ) . Chapter: 11th 12th std standard Class Physics sciense Higher secondary school College Notes | Study Material, Lecturing Notes, Assignment, Reference, Wiki description explanation, brief detail | Posted On : 14.03.2016 05:16 am . Feedback. The output voltage of regulator system is fixed as the zener knee voltage of the zener diode and can be used in power devices requiring a fixed voltage of firm value. At this point, the current begins flowing seamlessly without any change in voltage. Determine the maximum supply voltage that may develop, for example a 12 V level, also ensuring that the minimum supply voltage is always = 1.5 V + Vz (the zener voltage rating). 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. 1. We are going use it's reverse breakdown characteristics. 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. In spite of changes in the load current or in the input voltage, the Zener diode maintains a constant voltage across the load. However, this would not be possible with a standard diode. Resources. Video. Pro Lite, CBSE Previous Year Question Paper for Class 10, CBSE Previous Year Question Paper for Class 12. CO-ED SCHOOL KOLAR ROAD BHOAPL DEPARTMENT OF PHYSICS PROJECT REPORT INVESTIGATORYPROJECT ON PN JUNCTION AND DIODES PROJECT REPORT Submitted by Govind Patel Submitted to Mrs Ratna Hajela … The Zener diode specially made to have a reverse voltage breakdown at a specific voltage. As Voltage Regulator 12. As Voltage Regulator In a DC circuit, Zener diode can be used as a voltage regulator or to provide voltage reference. 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