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Practical 6 IGBT 1

The document outlines an experiment to investigate the switching behavior of an IGBT by recording load current as a function of gate-emitter voltage. It includes instructions for setting up the circuit, measuring devices, and analyzing the lamp's response to potentiometer adjustments. The findings indicate that the lamp's brightness is only controllable in a narrow region of the IGBT's conduction range, and it discusses the implications of gate power and triggering behavior.

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ROHIT
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29 views4 pages

Practical 6 IGBT 1

The document outlines an experiment to investigate the switching behavior of an IGBT by recording load current as a function of gate-emitter voltage. It includes instructions for setting up the circuit, measuring devices, and analyzing the lamp's response to potentiometer adjustments. The findings indicate that the lamp's brightness is only controllable in a narrow region of the IGBT's conduction range, and it discusses the implications of gate power and triggering behavior.

Uploaded by

ROHIT
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Experiment recording the characteristic

The following experiment investigates the switching behaviour of the IGBT. The load current as a
function of the gate-emitter voltage will be recorded.

Assemble the circuit as shown in the following circuit diagram and animation.

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1/4 Experiment recording the characteristic 08 March 2025
Open the DC Power Supply from the menu Instruments/Power
Supply.
Set to the following settings:

DC Voltage V1: 12 V
DC Voltage V2:
DC Voltage V3:

Press the POWER button.

Open voltmeter A from the menu Instruments/Measuring Devices or by


clicking on the image on the left.
Make the following settings:

RANGE: 10 V
MODE: RMS
DC

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2/4 Experiment recording the characteristic 08 March 2025
Open the dual amperemeter in the
menu Instruments/Measuring Devices
Perform the following settings for both channels:

CHANNEL E:
CHANNEL F:

RANGE: 300 mA
RANGE:
MODE: RMS
MODE:
DC

How does the lamp respond when the potentiometer is varied over its entire range?

The brightness of the lamp cannot be controlled over the


potentiometer's range.
The lamp stays off.
Over a wide range the lamp is either fully off or fully on. Only
in one narrow region where the IGBT just begins to conduct
can the brightness be controlled.

For the next measurement, remove the lamp from the load circuit.

Record the load current as a function of the gate-emitter voltage. Insert your measurement results in
the table below. By clicking on the 'Chart' icon you can display the I/U characteristic resulting
from the values in the table.
300
I(L) in mA

250

200

150

100

50

0
0 1 2 3 4 5 6 7 8 9 10
U(GS) in V

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3/4 Experiment recording the characteristic 08 March 2025
What is the triggering threshold of the transistor?

The triggering threshold is VGE ≅ ____V

Measure the gate current and the gate emitter voltage when the MOSFET is fully switched through.

What can be concluded about this kind of triggering as well as the gate power?

When the transistor is fully on, no current flows at the gate


and the transistor can be controlled without any power
dissipation.
When the transistor is fully off, a small current flows in the
gate. The transistor dissipates 20% of the power.
Gate triggering is not possible with this type of transistor. The
power is totally dissipated.

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4/4 Experiment recording the characteristic 08 March 2025

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