What is the difference between a soft start and a VFD?
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asked
Mar 15, 2018
by
anonymous

Advantages of Variable Frequency Drive (VFD)
Last Answer : Advantages of Variable Frequency Drive (VFD)
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98 views
2 answers
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Aug 9, 2017
by
anonymous

Describe with neat sketch the constructional details of IGBT.
Last Answer : Construction: Insulated gate bipolar transistor or IGBT, is a solid state devices primarily used as an electronic switch which, as it was developed, came to combine high efficiency and fast ... layer and p+ emitter constitute a BJT with a wide base region and hence small current gain.
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asked
May 21, 2020
by
anonymous
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Draw construction of IGBT.
Last Answer : construction of IGBT
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363 views
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asked
Oct 13, 2019
by
anonymous

Which phenomenon is present in thyristors but absent in BJT, MOSFET and IGBT ? (A) forward conduction (B) latching (C) forward blocking (D) reverse breakdown
Last Answer : Which phenomenon is present in thyristors but absent in BJT, MOSFET and IGBT ? (A) forward conduction (B) latching (C) forward blocking (D) reverse breakdown
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3.2k views
1 answer
asked
Apr 28, 2018
by
anonymous

Compare BJT, MOSFET and IGBT .
Last Answer : BJT MOSFET IGBT BJT is a current controlled device. MOSFET is a voltage controlled device. IGBT is a voltage controlled device. The input impedance of BJT is low. ... is minority carrier device. MOSFET is majority carrier device. IGBT is minority carrier device.
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asked
Nov 10, 2017
by
anonymous

Last Answer : Because it has a higher switching frequency and heat tolerance.
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Sep 15, 2017
by
anonymous

Justify the statements. 1. IGBT uses a vertically oriented structure. 2. IGBT is preferred as a power switch over both power BJT and MOSFET. 3. Punch through IGBT structure are more popular and are widely used.
Last Answer : 1. IGBT uses vertically oriented structure. IGBT use vertically oriented structure to reduce the resistance and to increase the current flow area. Hence IGBT uses vertically oriented ... DC circuit applications. Hence punch through IGBT structure are more popular and are widely used.
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3.0k views
1 answer
asked
Sep 15, 2017
by
anonymous

Also, highlight the problem faced during parallel operation.
Last Answer : Parallel operation of IGBT: Parallel operation of IGBT is done for obtaining high current rating. Paralleling of IGBT reduces conduction losses and thermal stress. IGBT combines the qualities of ... . IGBTs must share losses equally otherwise IGBT may get failure due to thermal differences.
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223 views
1 answer
asked
Sep 15, 2017
by
anonymous

Last Answer : No, IGBT is not the current controlled device. IGBT is a voltage controlled device. IGBT have combine qualities of MOSFET and BJT. The high switching speed of MOSFET and low conduction losses of BJT. Also, IGBT which stands for Insulated Gate Bipolar Transistor have high input impedance.
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asked
Sep 13, 2017
by
anonymous

Last Answer : IGBT is a bipolar device.
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Sep 13, 2017
by
anonymous

Last Answer : IGBT is a bipolar device because current is carried by both holes and electrons.
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asked
Sep 13, 2017
by
anonymous

Last Answer : ON state losses of IGBT is less as compared to MOSFET and BJT.
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142 views
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asked
Sep 13, 2017
by
anonymous

Give the applications of IGBT
Last Answer : 1) AC and DC motor drives 2) SMPS 3) Inverters 4) Choppers 5) Solid-state Relays 6) solid-state Contactors
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71 views
1 answer
asked
Oct 13, 2019
by
anonymous

The number of terminals present in IGBT is A) 2 B) 3 C) 4 D) 5
Last Answer : The number of terminals present in IGBT is 3
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asked
Jun 18, 2018
by
anonymous

Last Answer : Yes IGBT is costlier than BJT and MOSFET.
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asked
Sep 29, 2017
by
anonymous

what is variable frequency drive ?
Last Answer : .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }
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206 views
2 answers
asked
Aug 8, 2017
by
anonymous

Would you recommend putting a VFD on a fire pump?
Last Answer : I would not prefer to implement VFD with fire pump considering below points; Fire system is not continuously operating system, it is operated on occasional basis, just for operational testing or in case ... you may look for VFD option to eliminate PRVs, but compare your investment costs first..!!
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asked
Jan 23
by
anonymous

How VFD works in an electric car?
Last Answer : The variable frequency drive (VFD) can control both the speed and torque of a squirrel cage induction motor by varying the motor input frequency and voltage. The fundamentals components of a VFD system are an electric motor, modulator and controller.
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1 answer
asked
Jan 23
by
anonymous

IGBT is a voltage controlled device. Why?
Last Answer : Because the controlling parameter is gate-emitter voltage.
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1 answer

Why IGBT is very popular nowadays?
Last Answer : a. Lower hEAT requirements b. Lower switching losses c. Smaller snubber circuit requirements
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1 answer

What are the various parameters we have to consider, while selecting IGBT?
Last Answer : In IGBT datasheet, we have to focus on following parameters Collector to emitter voltage VCESCollector Current ICCollector Dissipation PCJunction Temperature Tj
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For High frequency applications will you prefer MOSFET or IGBT? Why?
Last Answer : For High frequency applications, MOSFET is the right choice of the device.Because MOSFET has low switching losses compare to that of IGBT.General rule of thumb is for low-frequency applications ... For high frequency applications having frequency range of more than 200kHz, we have to use MOSFET
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1 answer

For High voltage applications will you prefer MOSFET or IGBT?
Last Answer : For High voltage applications we have to use IGBT. Because MOSFETs are low voltage devices. ie, Their voltage rating is lesser than IGBT. General rule is MOSFETs are suitable for applications ... voltage less than 250V. The IGBTs are suitable for applications which has breakdown voltage upto 1000V.
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1 answer

A modern power semiconductor device IGBT is combines the characteristics of a) BJT and MOSFET b) FCT and GTO c) SCR and MOSFET d) SCR and BJT
Last Answer : Ans: BJT and MOSFET
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1 answer

IGBT uses IGBT uses
Last Answer : Applications of IGBT: 1. The insulated gate bipolar transistor (IGBT) is used Ac and DC motor drivers. 2. The IGBT is used in unregulated power supply (UPS) system. 3. The IGBT is used to ... an isolated-gate FET for the control input and a bipolar power transistor as a switch in a single device.
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1 answer
asked
Jun 11, 2020
by
anonymous

IGBT V-I characteristics
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Jun 11, 2020
by
anonymous

IGBT working principle
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Jun 11, 2020
by
anonymous

IGBT Construction
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asked
Jun 11, 2020
by
anonymous

What is IGBT (Insulated Gate Bipolar Transistor) ?
Last Answer : As compare to BJT and MOSFET, IGBT have very low on state voltage drop. IGBT require low driving power. IGBT have wide SOA (Safe Operating Area). The current conduction capability of ... very useful for improving dynamic performance and efficiency. IGBT also very good in reducing audible noise.
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367 views
2 answers
asked
May 18, 2018
by
anonymous

For IGBT, which of the following statement is true? (a) Switching speed of IGBT is more than bipolar transistor (b) IGBT is a current-controlled device (c) On-state collector- ... transistor (d) It combines voltage control features of MOSFET gate and high power capability of bipolar transistor
Last Answer : For IGBT, which of the following statement is true? (a) Switching speed of IGBT is more than bipolar transistor (b) IGBT is a current-controlled device (c) On-state collector- ... transistor (d) It combines voltage control features of MOSFET gate and high power capability of bipolar transistor
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300 views
1 answer
asked
May 15, 2018
by
anonymous

The requirement of the gate drive circuits for power MOSFET and IGBT is (a) high source capability (b) high sink capability (c) both (a) and (b) (d) high voltage capability
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asked
Apr 14, 2018
by
anonymous

An IGBT has three terminals called (a) Collector, Emitter and Base (b) Drain, Source and Base (c) Drain, Source and Gate (d) Collector, Emitter and Gate
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126 views
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asked
Apr 10, 2018
by
anonymous

Consider the following statements in respect of important features of IGBT. P. It has high input impedance gate as that of a MOSFET Q. It has low ON state voltage drop as that of a BJT R. Turn-off time is significantly less ... are correct? A) P and Q B) P and R C) Q and R D) P, Q and R
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asked
Apr 9, 2018
by
anonymous

The switching time (in µS) of IGBT is in the range of A) 20 B) 10 C) 2 D) 0.5
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asked
Apr 9, 2018
by
anonymous

Last Answer : IGBT is used as High frequency switching device.
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1 answer
asked
Mar 29, 2018
by
anonymous

Last Answer : Igbt alone cant convert dc to ac. igbt half bridge or full bridge or three phase topology could be used to convert dc to ac. also igbt gates should be driven by microcontroller or pwm/spwm gate driving signals ... e4(-) and g4 c2e1 and c4e3 pins are AC output pins. its name is igbt inverter.
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187 views
1 answer
asked
Feb 24, 2018
by
Amit Sharma
