STEP UP AND STEP DOWN MOSFET BASED CHOPPER
10:13:00
AIM:
To construct step up and step down MOSFET chopper and by varying the duty cycle ‘k’ observe Ton,Toff and output voltage.
APPARATUS REQUIRED:
Incandescent lamp :60W,30W
Patch chords :1 set
Glass fuses :1 set
Main chord :1 no.
Power scope :20MHz -1 no.
PRINCIPLE:
A power MOSFET has 3 terminals called drain (D), source(S), and gate(G).In place of corresponding 3 terminals; collector, emitter and base BJT.The arrow in circuit symbol of MOSFET indicates the direction of electron flow.A power MOSFET is basically voltage controlled device as it’s operation depends upon the flow of majority charge carrier only. MOSFET is a unipolar device.As the gate circuit impedance is extremel high of the order of 10 Ohm and the control signal is much larger.
Power MOSFETs are of two types: n-channel enhancements and p-channel enhancement.Out of two, n-channel is more commen because of higher mobility electrons.A chopper is a static device that convert fixed input DC voltage into variable DC output voltage directly.A chopper may be thought of a dc equivalent of a transformer in an identical manner.The power semiconductor device used for a chopper circuit can be forced commutated thyristor, BJT,power MOSFET into an IGBT.
PROCEDURE:
Connections are done as per circuit diagram using kit.The lamp across D indicate conduction.By varying duty ratio output waveforms are obtained in CRO. Ton and Toff values are noted and tabulated.
RESULT:
Constructed stepdown and stepup chopper using MOSFET and observed waveform.
output waveforms
AIM:
To construct step up and step down MOSFET chopper and by varying the duty cycle ‘k’ observe Ton,Toff and output voltage.
APPARATUS REQUIRED:
Incandescent lamp :60W,30W
Patch chords :1 set
Glass fuses :1 set
Main chord :1 no.
Power scope :20MHz -1 no.
PRINCIPLE:
A power MOSFET has 3 terminals called drain (D), source(S), and gate(G).In place of corresponding 3 terminals; collector, emitter and base BJT.The arrow in circuit symbol of MOSFET indicates the direction of electron flow.A power MOSFET is basically voltage controlled device as it’s operation depends upon the flow of majority charge carrier only. MOSFET is a unipolar device.As the gate circuit impedance is extremel high of the order of 10 Ohm and the control signal is much larger.
Power MOSFETs are of two types: n-channel enhancements and p-channel enhancement.Out of two, n-channel is more commen because of higher mobility electrons.A chopper is a static device that convert fixed input DC voltage into variable DC output voltage directly.A chopper may be thought of a dc equivalent of a transformer in an identical manner.The power semiconductor device used for a chopper circuit can be forced commutated thyristor, BJT,power MOSFET into an IGBT.
PROCEDURE:
Connections are done as per circuit diagram using kit.The lamp across D indicate conduction.By varying duty ratio output waveforms are obtained in CRO. Ton and Toff values are noted and tabulated.
RESULT:
Constructed stepdown and stepup chopper using MOSFET and observed waveform.
output waveforms
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I am a diploma student please compare your answer to tech max power electronics book G scheme
ReplyDeleteBecause daigram of step up chopper using MOSFET is different....
DeleteWhat are the values of components
ReplyDeleteCan I get the values of all components used for making this circuit
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