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Matching Type. Match column A with Column B. Write the letter of the correct answer on the blank provided. B Power Device A. Bipolar Junction...

  • Calculate the approximate output of the power supply (fig.5) when it is not loaded.
I. Matching Type. Match column A with Column B. Write the letter of the correct answer on the blank provided. B Power Device 1. A. Bipolar Junction Transistor (BJT) B. Insulated Gate Bipolar Transistor (IGBT) C. MOSFET Controlled Thyristor (MCT) D. Gate Turn-O± Thyristor (GTO) E. Silicon Controlled Recti²er (SCR) F. Field E±ect Transistor (FET) G. Triac H. Diode 2. 3. 4. 5. II. Answer the following brie³y and concisely. 1. State the important application of power electronics. 2. Give the function and discuss the principle of operation of the following semiconductor devices used to convert and control electrical power. a. Power Diodes b. Thyristors c. Static Induction Devices 3. For the control of electric power supplied to the load or the equipment/machinery or for power conditioning, the conversion of electric power from one form to another is necessary and the switching characteristic of the appropriate power semiconductor devices facilitate
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these conversions. Using power electronic components and devices, discuss ways on how to convert and control electrical power from: a. AC to DC b. DC to AC Support your discussion with the aid of a circuit diagram. Also, label the circuit components. III. Problem Solving. Show your complete solution to the given problem. Label your Fnal answer. (30 marks) 1. The BJT is speciFed to have a range of 8 to 40. The load resistance in R C =10 Ω. The dc supply voltage is V CC =220V and the input voltage to the base circuit is VB=12V. If V CE(sat) =1.0V and V BE(sat) =1.5V. (Refer to the circuit in Fgure 3) ±ind a. The value of R B that results in saturation with an overdrive factor of 6; b. The forced β f ; c. The power loss P T in the transistor. ±igure 3 2. A single phase half-wave ac voltage controller (Fgure 4) has a load resistance R=100Ω; input ac supply voltage is 220V RMS at 60Hz. The input supply transformer has a turn’s ratio of 1:1. If the thyristor T 1 is triggered at α= 60 o . Calculate: a. RMS output voltage; b. Output power; c. RMS load current and average load current; and d. Input power factor.
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