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Ex. No. 6STEP UP AND STEP DOWN MOSFET BASED CHOPPERSAIM:To construct Step down & Step up MOSFET based choppers and to draw its output response.APPARATUS REQUIRED:S.NoApparatusRangeQuantity1Step up & Step down MOSFET based chopper kit12CRO20 MHz13Patch chords15PROCEDURE (STEP UP CHOPPER & STEP DOWN CHOPPER) :Initially keep all the switches in the OFF positionInitially keep duty cycle POT in minimum positionConnect banana connector 24V DC source to 24V DC inputConnect the driver pulse [output to MOSFET inputSwitch on the main supplyCheck the test point waveforms with respect to ground.Vary the duty cycle POT and tabulate the Ton, Toff & output voltageTrace the waveforms of Vo Vs & IoDraw the graph for Vo, Vs, Duty cycle, KCIRCUIT DIAGRAM (STEP UP CHOPPER) :TABULAR COLUMN (STEP UP CHOPPER):Vs = ____________ VS.NoTon(Sec)Toff(Sec)T(Sec)Duty Ratio, k=Ton/TVo=Vs/(1-k)TheoreticalVoPracticalTABULAR COLUMN (STEP DOWN CHOPPER):Vs = ____________ VS.NoTon(Sec)Toff(Sec)T(Sec)Duty Ratio, k=Ton/TVo= k Vs(1-)TheoreticalVoPracticalMODEL GRAPH:STEP UP CHOPPER:STEP DOWN CHOPPER:RESULT:Thus the output responses of Step down & Step up MOSFET based choppers were drawn.Ex. No. 7IGBT BASED SINGLE PHASE PWM INVERTERAIM:To obtain Single phase output wave forms for IGBT based PWM inverterAPPARATUS REQUIRED:S.NoApparatusRangeQuantity1IGBT Based PWM inverter Kit220V/10A12CRO20 MHz13Patch chords154Load rheostat50?/5A1PROCEDURE :Make the connection as per the circuit diagram.Connect the gating signal from the inverter module.Switch ON D.C 24 V.Keep the frequency knob to particulars frequency.Observe the rectangular and triangular carrier waveforms on the CRO.Obtain the output waveform across the load Rheostat.CIRCUIT DIAGRAM:TABULAR COLUMN:S.NoVin (Volts)Amplitude(Volts)Time Periods (ms)Time (ms)Output VoltageTonToffMODEL GRAPH:RESULT: Thus the output waveform for IGBT inverter (PWM) was obtained.Ex. No. 8IGBT BASED SINGLE PHASE PWM INVERTERAIM:To obtain three phase output wave forms for IGBT based PWM inverterAPPARATUS REQUIRED:S.NoApparatusRangeQuantity1IGBT Based PWM inverter Kit220V/10A12CRO20 MHz13Patch chords154Load rheostat50?/5A1PROCEDURE :Make the connection as per the circuit diagram.Connect the gating signal from the inverter module.Switch ON D.C 24 V.Keep the frequency knob to particulars frequency.Observe the input and output waveforms for 180o conduction mode and 120o conduction mode in the CRO.Obtain the output waveform across the load Rheostat.CIRCUIT DIAGRAM:TABULAR COLUMN:S.NoOutput Voltage Vout (Volts)Time Periods (ms)Time (ms)Conduction ModeTonToffMODEL GRAPH:RESULT:Thus the output waveform for IGBT inverter (PWM) was obtained.Ex. No. 9 SINGLE PHASE AC VOLTAGE CONTROLLER USING TRIAC AIM: To study the Single phase AC voltage control using TRIAC with DIAC or UJT Firing Circuit.APPARATUS REQUIRED:S.NoApparatusRangeQuantity1Lamp60W12Resistor100?/1W13Potentiometer100k?14Capacitor0.1F/400V15DIACDB316TRIACBT 13617CRO20 MHz18Patch chords15CIRCUIT DIAGRAM:CIRCUIT OPERATION:When potentiometer is in minimum position drop across potentiometer is zero and hence maximum voltage is available across capacitor. This Vc shorts the diac (Vc > Vbo) and triggers the triac turning to ON – state there lamp glows with maximum intensity.When the potentiometer is in maximum position voltage drop across potentiometer is maximum. Hence minimum voltage is available across capacitor (Vc < Vbo) hence triac is not triggered hence lamp does not glow.When potentiometer is in medium position a small voltage is available across capacitor hence lamp glows with minimum intensity.PROCEDURE :Connections are given as per the circuit diagramInitially potentiometer kept at minimum position so lap does not glow at this instant.Note the voltage across the diac and triac.Capacitor and potentiometer using multimeter and CRO.Potentiometer is now placed at medium and then to minimum position and their voltages were noted.TABULAR COLUMN:S.NoInput Voltage Vin(Volts)Output Voltage Vout (Volts)Time Periods (ms)Firing Angle (Degree)Ton(ms)Toff(ms)MODEL GRAPH:RESULT:Thus the operation and performance of the single phase AC voltage control using TRIAC is done and output verified.Ex. No. 10SWITCHED MODE POWER CONVERTERAIM:To construct a switched mode power Converter and find its efficiency.APPARATUS REQUIRED:S.NoApparatusRangeQuantity1Switched Mode Power Converter Kit(0-30)V, AC Input12Loading Rheostat100?/2A13Ammeter(0-1)A,MI24Voltmeter(0-30)V,MI15Connecting Wires-ReuiredPROCEDURE:Make the connections as per the circuit diagram.Connect the mains card to the 220V AC and note the regulated DC output as 10V in the voltmeter.Connect a Rheostat of 100Ω / 2A across output voltmeter and measure the load current in the Ammeter.Increase the load from the rheostat and note that there is no decrease from the output voltage 10V DC.Note down the voltmeter reading.Switch off the power supply and disconnect.BLOCK DIAGRAM:TABULAR COLUMN:To Find Line Regulation:S.NoVin(Volts)Vout(Volts)It(Amps)Regulation(%)To Find Load Regulation:S.NoVin(Volts)Vout(Volts)It(Amps)Regulation(%)RESULT: Thus a Switched mode power converter was constructed and found out the efficiency. ................
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