* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Sathyabama Univarsity M.E Dec 2010 Analysis of Rectifiers and
Wien bridge oscillator wikipedia , lookup
Immunity-aware programming wikipedia , lookup
Oscilloscope history wikipedia , lookup
Yagi–Uda antenna wikipedia , lookup
Spark-gap transmitter wikipedia , lookup
Radio transmitter design wikipedia , lookup
Transistor–transistor logic wikipedia , lookup
Analog-to-digital converter wikipedia , lookup
Phase-locked loop wikipedia , lookup
Josephson voltage standard wikipedia , lookup
Standing wave ratio wikipedia , lookup
Valve audio amplifier technical specification wikipedia , lookup
Valve RF amplifier wikipedia , lookup
Wilson current mirror wikipedia , lookup
Power MOSFET wikipedia , lookup
Operational amplifier wikipedia , lookup
Schmitt trigger wikipedia , lookup
Resistive opto-isolator wikipedia , lookup
Surge protector wikipedia , lookup
Current source wikipedia , lookup
Integrating ADC wikipedia , lookup
Voltage regulator wikipedia , lookup
Current mirror wikipedia , lookup
Power electronics wikipedia , lookup
Switched-mode power supply wikipedia , lookup
Register Number SATHYABAMA UNIVERSITY (Established under section 3 of UGC Act, 1956) Course & Branch: M.E-W-PEL/PEL Title of the Paper: Analysis of Rectifiers and Choppers Max. Marks: 80 Sub. Code: SEEX5001 Time: 3 Hours Date: 09/12/2010 Session: FN ______________________________________________________________________________________________________________________ 1. PART - A (6 X 5 = 30) Answer ALL the Questions An RL load is fed from single phase supply through a thyristor. Derive an expression for load current in terms of supply voltage, frequency etc. 2. Explain the effect of source inductance on the performance of three phase controlled rectifiers. 3. Design the filter component for a buck converter which has an input voltage of 12V and output voltage of 5V. the peak to peak output ripple voltage is 20mV and peak to peak ripple current of inductor is limited to 0.8A. The switching frequency is 25 kHz. 4. For a single phase voltage controller connected to resistive load, draw the wave form of source voltage, gating signals, output voltage and voltage across an SCR. 5. Explain the principle and working of matrix converter. 6. Compare between circulating current mode and non circulating current mode of dual converter. PART – B (5 x 10 = 50) Answer ALL the Questions 7. 8. Analyze the work of single phase dual converter with a neat sketch and wave forms. (or) Derive an expression to find the average Value of output current of a single phase semi converter that delivers power to RLE load. Assume continuous conduction. Also find the same when R = 5, L = 10mH and E = 80V. 9. For a three phase dual converter, derive an expression for output using circulating current scheme. Sketch the relevant wave forms. (or) 10. A half controlled three phase bridge rectifier is supplied at 220V from a source of reactance 0.24/phase, neglecting resistance and device volt drops determine mean load voltage for level load current of 40A at a fixing delay angle of 45 and 90 degrees. 11. List the various types of switched mode regulators and explain the working of CUK converter in detail. (or) 12. With necessary circuit and wave forms explain the principles of step up chopper. Derive an expression for the output voltage in terms of input DC voltage and duty cycle. State the assumptions made. 13. Explain the operation of three phase bi-directional data connected controllers. (or) 14. A step down DC chopper has a resistive load of R = 10 and the input voltage is Vs = 220V. When the chopper switch remains on, its voltage drop is 2V and the chopping frequency is 1 kHz.If the duty cycle is 50%, determine (a) the average output voltage V0, (b) the rms output voltage, (c) the chopper efficiency (d) the effective input resistance of the chopper 15. Explain with circuit and wave forms, the operation of single phase to single phase step down cycle converter for the following (a) Discontinuous load current (b) Continuous load current (or) 16. Explain the current of controllers. Apply the same for explaining for the operation of AC voltage controllers.