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Diodes and Application 1. Identify the types of diodes.2. Discuss, illustrate and derive the related equations of various rectifier circuits.3. Discuss the block diagram of a power supply. You may illustrate it and the corresponding waveforms.4. State other applications of a diode. (rectifier circuit is an application of diode)I. IDENTIFY THE TYPES OF DIODES.a. Zener Diode      A passive element that works at zener breakdown. But it allows the current in reverse direction when the applied voltage reaches the breakdown voltage.b. Light Emitting Diode                            It is one of the most popular types of                                                             diode. If forward biased with current                          flowing through the junction, the light is                       produced.c. Schottky Diode         This diode has a lower  forward voltage drop than ordinary  silicon  PN junction diodes. d. Shockley Diode           First semiconductor devices that has four layers. It is also called as PN junction.e. Tunnel Diode            It is used as high speed switch of order nano-seconds.f. Photodiode            This type of diode is used for detecting light.II. RECTIFIER CIRCUITS.                    Half Wave Rectifier                                It eliminates the negative portions of                                                                                                       the input sinusoid.                                                                                      Vo = 0When   VS < VD    1.                                          Vo = VS - VD                                When   VS ? VD    2.VD = 0.7V                   Full Wave Rectifier                   Can utilize both negative and the positive portion of the AC input voltage.The voltage at the cathode of D2 is,                                  (VS – VD) The voltage at the anode od D2¬  is,                                        -vSThus, the PIV is,                              (VS – VD) - (-VS) :                                 PIV = 2VS - VDIII. DISCUSS THE BLOCK DIAGRAM OF A POWER  SUPPLY.                 The Fig. 1 shows the block diagram of a typical power supply. The dc power supply converts the standard 120V, 60 Hz ac voltage available at wall outlets into a constant dc voltage. AC input line voltage is stepped down, then the rectifier converts ac input voltage to a pulsating dc voltage and it is called half-wave rectified voltage. The filter now eliminates the fluctuations in the rectified voltage and it produces a smooth dc voltage. Lastly, the regulator will maintain a constant dc voltage for variation in the input line voltage or in the load.                                 Fig.1  Block Diagram of a Power SupplyIV. APPLICATION OF A DIODE.          While only two pin semiconductor devices, there are a number of applications of diodes that are vital in modern electronics. Diodes are known for only allowing current to move in one direction through the component.This lets a diode acts as a one-way valve, keeping signals where they need to be or routing them around components. While diodes only let current move in one direction, each type of diode acts differently, making a number of useful applications for diodes.Some of the typical applications of diodes include:• Rectifying a voltage, such as turning AC into DC voltages• Isolating signals from a supply• Voltage Reference• Controlling the size of a signal• Mixing signals• Detection signals• Lighting• Lasers diodesReferences1    https://www.google.com.ph/search?q=power+supply+diagram&dcr=0&source=lnms&tbm=isch&sa=X&ved=2        0ahUKEwi0trXSjOPXAhWCjLwKHSXrBQUQ_AUICigB&biw=1422&bih=743#imgrc=CvCGsvDb6SaUvM3    http://www.electronicshub.org/types-of-diodes/http://www.radio-electronics.com/info/data/semicond/diodes/types-of-diodes.php                                                                              4 T. Floyd , Electronic Devices, Ninth Edition                                                                                                                                    5 https://www.lifewire.com/applications-of-diodes-818815

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