EECS314_W08_HW9 - EECS 314 Winter 2008 Homework set 9...

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EECS 314 Winter 2008 Homework set 9 Student’s name ___________________________ Discussion section # _______ (Last, First, write legibly, use ink) (use ink) Instructor is not responsible for grading and entering scores for HW papers lacking clear information in the required fields above © 2008 Alexander Ganago Page 1 of 2 Scores for the HW set: Problem 1 2 3 4 5 6 7 Total Score Problem 1 Power supply: Ripples in the output voltage The Big Picture For The big picture , refer to the file Power Supply and Voltage Regulation on CTools . The Assignment Part 1 (25 points = 5 points for each correct sketch) Consider a Full-Wave Rectifier with a transformer and a bridge circuit with four diodes as in Problem 1 of this set; assume offset diode model with V DO = 0.7 V. Consider the 60-Hz sinusoidal input and the peak amplitude of the sinusoidal voltage across the secondary coil V IN, PEAK = 5 V. Use the provided sketch of the input voltage and add the following waveforms (three periods of each): Indicate the time in msec A. Output voltage measured across the resistor, without any capacitor in the circuit; indicate the peak output voltage in volts B. Output current through the load resistor, in the circuit without any capacitor Part 1 2 3 Total
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EECS 314 Winter 2008 Homework set 9 Student’s name ___________________________ Discussion section # _______ (Last, First, write legibly, use ink) (use ink) Instructor is not responsible for grading and entering scores for HW papers lacking clear information in the required fields above © 2008 Alexander Ganago Page 2 of 2 Problem 1, continued Part 1, continued Sketches (continued) Now, consider the complete circuit with both the capacitor and resistor connected to the rectifier. Sketch: C. The output voltage measured across the load resistor, to which a capacitor is connected in parallel (for clarity, show the ripple voltage of about ¼ of the peak output voltage) D. The current through the load resistor, in the same circuit E. The current through the capacitor (positive when the capacitor is charging, and negative when the capacitor is discharging), in the same circuit. Clearly label the intervals of time (do not calculate the moments of time; a qualitative picture is enough) during which the diode conducts and charges the capacitor, and during which the diode does NOT conduct and the capacitor is discharged. Write a brief explanation of each sketch, based on KVL, KCL, etc. Part 2 (10 points) Calculate what capacitance C is needed to ensure that the ripple voltage in the output of the Full-Wave Rectifier is within 0.5% of the peak voltage, with the load resistance equal to 1 k Ω . Your answer: C = __________ Determine the ripple voltage (as % of the peak voltage), which will be obtained in the circuit with a Half-Wave rectifier, the same load resistance and capacitance. Your answer: Ripple voltage with a Half-Wave rectifier =_____ %
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EECS314_W08_HW9 - EECS 314 Winter 2008 Homework set 9...

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