ELEX_4420_-_Lab_08_-_Switch_Mode_Power_Supply_SMPS

Design rectifier circuits to provide an output of100 VDC using a.) HWR b.) Center-tappedFWR and c.) Bridge-Type FWR circuits. For each circuit, calculate the transformer peakvoltage rating, the diode PIV ratings, and thetransformer turns ratio, if power is taken fromthe 220V line ac supply

for the above boost converter, what is the max voltage stress on the MOSFET and diode? what is the output voltage peak to peak ripple?

Explain the two types of MOSFETs (draw the physical structure as well). Also explain themajor difference between them regarding mode of operation?

QUESTION 1 By referring to Figure Q1, determine: a) The Q-point values of Ic and VCE. b) Draw the DC load line and plot the Q-point based on answer from Q1(a). c) The diode emitter resistance, re and draw re transistor model (AC equivalent circuu). d) The input impedance, Zi as seen from the input voltage. e) The output impedance, Z, as seen from output. f) The voltage gain, Av and the current gain, A¡.

What is mean by phase angle control method?. Differentiate Natural and forced commutation method. Is it possible to construct rectifier circuits by MOSFET? Justify.                                           ( short anser only plases )

8-The waveform of output voltage of half-controlled three phase bridge rectifier in each cycle contains: Two- pulse six- pulse three- pulse 9-The DC supply voltage of single phase bridge inverter is 300V. For quasi-square wave output voltage with a 60 percent ON time, the RMS value of output voltage is: 232.37V 220.5V 270.9V 10-For three phase bridge inverter with 120° conduction and resistive star-connected load, the waveforms of: (a) The load current and line voltage are quasi-square. (b) The load current is quasi-square and line voltage is a six- step. (c) The load current is six- step and line voltage is quasi-square. 9.

3. Is it possible to construct rectifier circuits by MOSFET? Justify.

A 3.3-V, 30-A dc power supply is to be designed with a ripple of less than1.5percent. Assume that a half-wave rectifier circuit (60 Hz) with a capacitor filter is used. (a) What is the size of the filter capacitor C? (b)What is the PIV rating for the diode? (c)What is the rms value of the transformer voltage needed for the rectifier?(d) What is the value of the peak repetitive diode current in the diode? (e) What is the surge current at t =0+?

Design rectifier circuits to provide an output of 100 Vpc using a.) HWR b.) Center-tapped FWR and c.) Bridge-Type FWR circuits. For each circuit, calculate the transformer peak voltage rating, the diode PIV ratings, and the transformer turns ratio, if power is taken from the 220V line ac supply.

(a) The bridge full-wave rectifier with R-L load is designed using such parameters: input voltage = 230Vrms, 50 Hz, R = 13.32 and L = 98 mH. If the firing delay angle is set to 25, then determine: i). current mode operation of this rectifier ii). output current iii). power absorbed at the load iv). power factor

Operate the Buck converter circuit in discontinuous conduction mode. Identify the parameter values that needs to be modified in order to do so

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.

The waveforms shown in figure (1) the output waveforms of as an astable multivibrator using 555 timer. From these waveforms and for each output cycle answer the following: 1) The value of the charging time interval of the capacitor is. . second. 2) The value of the discharging time interval of the capacitor is. . second. 3) The value of the time interval that the transistor remains ON is. . seconds 4) The value of the time interval that the transistor remains OFF is. . seconds 5) The S input of the S-R flip flop = logic (1) when. . 3.3v No A 44545 Foorus

I need a diagram of a circuit by the transform and rectification block, using the bridge rectifier circuit (KBJ1008). It can be a source of any value. You don't need to do any calculations, just a drawing of how this circuit will look, please.

1) Explain the Voltmeter PMMC instrument and the Ammeter PMMC instrument in AC?2) What are the benefits of using an Auto Transformer instrument in AC?

How do we know current flows in source terminal? Is this common for n-type mosfet? What is an n-type mosfet?

6-If the collector resistance is shorted,the ac output voltage will a-Decrease. b-Increase. c-Remain the same. 9 d-Equal zero. 7-If input impedance of the second stage decreases, the voltage gain of the first stage will a-Decrease. b-Increase. c-Remain the same. d-Equal zero. 8-If the load resistance of second stage opens, the voltage gain of the first stage will a-Decrease. b-Increase. c-Remain the same. d-Equal zero. 9-The feedback resistor a-Increases voltage gain. b-Reduces distortion. c-Increases collector resistance. d-Decreases input impedance. 10-when the emitter resistance Rp doubles the ac emitter resistance a-Increases. b-decreases. c-Remains the same. d-Cannot be determined. 11-To reduce the distortion in a CE amplifier, reduce the a-DC emitter current. b-Base-emitter voltage. c-Collector current. d-AC base voltage. 12-The output voltage of a CE amplifier is a-Amplified. b-Inverted. c-180° out of phase with the input. d-All of the above.

Determine the ripple factor for the filtered bridge rectifier with a load as indicated in the figure below.

A 10 V Zener diode is used to regulate the voltage across a variable loadresistor. The input voltage Vs varies between 13 and16 V. The loadcurrent (??) varies between 10 and 85 mA. The minimum Zener current is15 mA. Findi. The maximum value of Rsii. The maximum power dissipated by the Zener diode, using the value ofRs.

FETs have similar properties to ___. a. Scotty diodes b. NPN transistors c. PNP transistors d. uni-junction transistors

A single phase, fully controlled bridge rectifier supplies a series connected resistor- inductor load (R = 20, L = 0.02H) from 220V, 50HZ AC supply. The triggering angle of the thyristors is 60°. (Assume the circuit is ideal.) a. Sketch the circuit. b. Develop the load current expression and check the continuity of the load current. c. Sketch the load voltage and load current waveforms. d. Calculate the mean values of the load voltage and load current. e. Sketch the inductor voltage and calculate its mean value. f. Calculate the FF (form factor) and RF (ripple factor) of the load voltage.

A Bipolar junction Transistor with curreat amplification factor being 100, Input Base current  is 50μA. Collector voltage is 10 V and biasing voltage being +20 V. Find followings a. Collector current   b. Resistance (R1) c. Collector voltage , Emitter voltage , Base Voltage & Collector-Emitter Voltage.

The mode of operation for the D-MOSFET is Select one: a. the ohmic region only b. the enhancement mode only c. both the depletion and enhancement modes d. the depletion mode only

4. Add a 100uF tilter capacitor. Analyze the filtered rectifier circuit. Find the indicated values. 10:1 120 Va 10 ka Voc Vrlpp) ripple factor

A thyristor half-wave controlled converter has a supply voltage of 240V at 50Hz and a load resistance of 100 ohms. What are the average values of load voltage and current when firing delay angle is; 1. 140 degrees. 2. 30 degrees.

A 4.7 zener diode is connected to the base resistor. The left side of the resistor sits at about 12V. The right side of the biasing resistor is connected to the Zener and npn transistor. The Zener bias is 5mA. The base current needed is 80uA. What is the appropriate resistor for this circuit? (In kohms) I

Instruction: Show complete solution. Use at least two decimal places. Express your answer in engineering notation. Determine the voltage and current operating values for the following BJT bias circuits and draw the DC load line.