_EET-117 LAB 3 21F copy Centennial College (2)

In a rectifier circuit , DC output voltage and RMS output voltage is  0.3 V & 0.48 V respectively. The form factor of this circuit is ___________________.

QUESTION 1 Design a high efficiency 3.3 V, 5A d.c.to d.c. power converter from a 4 to 5.5 Vdc source. The maximum allowable inductor current ripple and output voltage ripple are 0.1A and 20 mV, respectively. Assume a switching frequency of 20 kHz. a) Design a suitable converter power circuit using a MOSFET switch, showing all calculation of inductor and capacitor values and drawing a circuit diagram of the final design including component values. Indicate the peak inverse voltage and forward current rating of any diode required, and the maximum drain- source voltage of the MOSFET. b) On the Schematic diagram, draw the path of the current flow during the ON time and the OFF time. c) Describe the effect of changing the values of the inductor and the capacitor in the circuit. d) What is the effect of switching frequency in the circuit? e) Draw the schematic diagram of a circuit with the output voltage higher than the input voltage.

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-Fill in the blank(s) with appropriate word(s): 1. The three –phase half - wave converter is not normally used in practical systems, because ___________________.2. The three –phase half - wave converter is provide _______________average output voltage.3. The frequency of output ripple voltage for three –phase half - wave converter is_____________.

Q1: The chopper circuit shown in Figure (1-a), delivered by 12 volts, the produced average load current is 1.25A where the switching signal is shown in Figure (1-b). L is 150µH and C is 220µF. Determine: a. The average output voltage. b. Peak-to-peak output voltage ripple. c. Peak-to-peak ripple current of inductor. d. Peak current flow in the switch (transistor). sit) +10+ 10 tlus) (a) Chopper circuit (b) Switching signal Figure (1)

The three-phase full-wave converter shown below is used to rectify the three phase (Y-connection) source signals. The six Thyristor are triggered in the sequence shown. Sketch for firing angle (a=90°) the output voltage (Vo), the phase current, the current for any two Thyristor in any one leg, and the load current (Ia). Then calculate (a) Thyristor average and r.m.s current. (b) Supply average and r.m.s current. (c) The normalized average output voltage. (d) The maximum output voltage. [Vdc = [1 - cos(60+ a)] Vml T If the line-to-neutral voltages are defined as 11 T, T T STA T. Load I sin od sin() ex-> Solve the question sin(with your own hands the corresponding line-to-line voltages are √31% sin (out + ) ---√(4)

High voltage

Design of a DC-DC Converter. The Circuit Below shows a basic Buck-Boost Converter with a highly inductive Load. With a Deliberate mistake in the configuration of the Circuit Connection. The Value of L1 is 22mH, C1 is 10uF, R1 is 220 and L2 is 10mH. The circuit operates with a switching frequency of 20KHZ. The Duty cycle of the Clock signal V2 is given by the function below: ( 17 ) х0.2 Duty Cycle, k = 0. 55 + 100 Your Unique Duty Cycle = %3D Buck-Boost Converter Q1 IRG4BC10U D1 R1 222 1N4009 C1 LV1 12V L1 22mH 10µF L2 10mH a) Find the mistake in the configuration of the circuit and correct the connection error.

write the specification of circuit breaker.

A step up chopper has 175 volts as input and the output required is 325 volts. If the non-conducting time of thyristor is 175 micro seconds-compute. ) Chopping frequency. ii) If the pulse width is (1/4)th of that in case () for constant frequency of operation, find the new output voltage. ii) If the frequency is increased 20% of that in case (i) keeping the conducting time constant, what is the new value of k and output voltage of the chopper.

A 3-phase half wave controlled AC to DC converter is supplied from a 250V, supply. Assume the thyristor voltage drop to be 1.6V and the load current to be continuous. Evaluate the mean output voltage when firing angle is varied at 45(degree) , 60(degree) and 90(degree)

What is the action of a capacitor in a Power Supply Circuit?*   a. To de-couple DC component of the rectified AC input b. To increase the DC component of the output wave. c. To remove DC component of the AC wave. d. None of the above.

Q5 (a) A centre tapped rectifier has the following parameters: Nsec = 0.2, Vp(pri) = 240 V, f = 120 Hz Npri Determine the ideal average voltage (Vpc), peak inverse voltage (PIV), rms ripple voltage (Vr(rms)) and ripple percentage (r) of this rectifier circuit.

Power electronics.   Describe different control schemes of AC regulators and derive the expressions of average and effective values of output voltage.

Please also answer question 2 and 3. The justifications … no cursive

2. Determine the TEC and NEC (Ans. RTH = 9 0; VTH = 8 V; IN = 0.89 A) 70 4A 60

List the steps to analyze the AC circuits.

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Q1/ Sketch and describe mathematically the even and odd components of the signal shown in Figure (1) -1-2-012345 Figure (1)

4. Explain the operation of a full-wave voltage quadrupler circuit (With proper explanation, equation, and diagram of each cycle).

1. Single phase half-wave converter has a purely resistive load of R and delay angle is a= n/2 determine: (a) Rectification efficiency (b) Form factor (c) Ripple factor.

A resistor Ra is in series with a voltage source Va. Draw the circuit. Label the voltage across the combination as v and the current as i. Draw and label the volt–ampere characteristic (i versus v).

Subject name: Signal processing measurement Question: Is there any difference between the metallic resistance and the semiconducting resistance?

What is the significance of commutation in power electronic systems? Explain the operation of a commutation circuit in a thyristor-based converter.

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