Questions tagged [igbt]

Insulated-gate bipolar transistor, voltage-driven power transistor with fast switching times

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14
votes
4answers
6k views

Driving highly inductive loads destroys mosfet driver

Background I am attempting to generate some relatively high voltages (>200KV) using a system of ignition coils. This question deals with a single stage of this system which we are attempting to make ...
14
votes
2answers
3k views

IGBT vs. Power MOSFET for switching applications. Where to draw the line?

For lower breakdown voltages, a power MOSFET is clearly the device to go for, in view of its higher efficiency, higher commutation speed and lower price. Where should the line be drawn, upwards of ...
12
votes
2answers
3k views

What is the difference between driving a MOSFET gate and an IGBT gate?

Can I use an suitable IGBT gate driver for driving the MOSFET, and vice versa? Which parameters (threshold, plateau, and turn on voltage ratings, gate capacitance, etc) must be the same for this ...
9
votes
4answers
1k views

IGBT ratings, I don't understand how this is possible

I found the IXGX400N30A3 at Digikey. The datasheet says the device is rated for 400A @ 25C, 1200A @ 25C for 1ms, with a voltage rating of 300V and PD of 1000W. Really? This TO-264 package can ...
9
votes
6answers
20k views

What caused this IGBT failure?

I connected the circuit below, a transistorized ignition circuit, and it worked for a couple minutes, then it stopped working (engine quit, wouldn't restart). When it stopped working, I couldn't feel ...
9
votes
1answer
559 views

Need help understanding and interpreting IGBT datasheets

When it comes to motor control, I understand that we have the option of using discrete MOSFETs or IGBTs. Also, there are some products in the market where 6 IGBTs are placed in one single package, ...
5
votes
3answers
3k views

What happens with transistor outside max temperature range?

Suppose I have an IGBT transistor rated for 60A, that has junction temperature range of -55 to 175C. What happens if I do not exceed max current, but I do exceed max temperature? The characteristics ...
5
votes
1answer
1k views

What is this circuit equivalent to?

Connecting a small-signal N-channel MOSFET and a power NPN BJT like this darlington-ish configuration, what does it produce? Is it equivalent to what people call IGBT? What about its P-channel ...
4
votes
4answers
1k views

Why is this BJT not going into saturation?

I built a project based off of this description, but substituted an STGP7NC60HD IGBT. See the schematic below (Note: IGBT symbol doesn't exist as of this post, so JFET was substituted). The coil and ...
4
votes
3answers
9k views

IGBT as a switch

I've searched over the net on this issue but found no answers. In your own experience or thought, is it possible to use igbt as a switch? If yes, please provide schematic as an example. EDIT: This ...
4
votes
1answer
1k views

Current source with IGBT

A simple current source using a bipolar transistor uses the voltage over an emitter resistor as feedback of the current. The current is given by the base voltage, the \$U_{eb}\$ of the transistor, ...
4
votes
2answers
71 views

n Gate to source capacitor in gate drive?

I'm designing a gate drive and I saw in a reference design this circuit, what would be the explanation for placing a capacitor between gate-source of the MOSFET (or IGBT)? I've read that a resistor is ...
4
votes
4answers
12k views

H-bridge driver circuit

I am trying to use the IGBT driver IR2184 to drive a H-bridge made of powerpack CM100DU-24F. Here is the circuit I built: simulate this circuit – Schematic created using CircuitLab a) How do ...
3
votes
1answer
551 views

Can multiple IGBTs share voltage?

I'm building a solid state tesla coil, which requires me to switch very high voltages at high speed to achieve resonance. The problem: I can't find any IGBTs that can switch the voltage I need. In ...
3
votes
2answers
142 views

MOSFET/IGBT Current capacities and SOAs

I need to switch off a 20V 60A DC current electronically. I don't want to use a relay, due to the environment (vibrations etc.). It is not a switching supply, just a switch that turns everything off ...
3
votes
2answers
367 views

What does this IGBT data sheet mean by “transient” gate voltage?

I'm using IXGH45N120 to discharge some capacitors. The gate voltage is derived from the capacitor voltage, through some resistors and a zener. The circuit has worked fine for a long time, many ...
3
votes
1answer
306 views

Choosing a suitable power supply for a MOSFET driver chip

I would like to use the TC4427 MOSFET driver chip, in order to switch the current through the IGBT AUIRG4PH50S, which will be placed in series with a resistive load. The power supply providing the ...
3
votes
1answer
748 views

Testing parallel IGBT module

A single NPN IGBT chip can usually be tested by a 9V battery between gate and emitter. However opening up a larger module reveals many IGBT modules in parallel. I`ve seen some inverters using ...
3
votes
1answer
134 views

Buck converter simulation

I am having some troubles to simulate a Buck converter in LTSpice. I added a picture of my schematic in which a use an IGBT (IRGP20B120U-EP from International Rectifier) and a fast recovery diode ...
2
votes
2answers
724 views

IGBT transistor with auxiliary emitter

Recently I discovered, that some IGBT transistors in IGBT modules have the second pin for an emitter, called auxiliary emitter. In the picture above 2nd and 4th pins are auxiliary emitters. This is ...
2
votes
2answers
181 views

What limits the number of MOSFETs/IGBTs in Series / Parallel

I was looking at HVDC systems out of curiosity and I have a question that I have not exactly found an answer for. In HVDC converter, because of the high voltage (Tens/Hundreds of kV) they have to ...
2
votes
1answer
426 views

Difference between Vth and Vge?

What is the difference between the threshold voltage (Vth) and gate-emitter voltage (Vge) for IGBT devices? How can I calculate Vth of an IGBT chip?
2
votes
2answers
251 views

Risks of using device body as heat sink for IGBT and Bridge rectifier

I want to know is any risk factor (electrical shocking or ... ) for using one aluminum (4mm) device body which is used as heat-sink for IGBT and Bridge rectifier that are working with 220 volt power? ...
2
votes
1answer
7k views

Bidirectional AC Switch with IGBTs

I came across a "IGBT Bi-directional Switch" on the web while looking for a solution to my problem of protecting a TRIAC/SSR from a short-circuit. Since TRIAC/SSR turn-off is not in my control, I'm ...
2
votes
2answers
694 views

Was this a high IGBT gate current?

I'm controlling an IGBT inverter with a DSP. I'm pretty sure I turned on two IGBT's at the same time which made a short circuit. The PCB I'm using to step up the PWM signal to drive the IGBT's let the ...
2
votes
4answers
63 views

Isolated Power Supplies for Inverter Gate Drivers

I am using a 3-Phase IPM IGBT Inverter Module in motor driver. This module has built-in gate drivers which require 4 Isolated power supplies for their operation. In all I have to design 5 Isolated ...
2
votes
1answer
491 views

Is this the correct way to calculate IGBT power loss?

I am having trouble obtaining the power dissipation of IGBTs. It does not have a buit in diode and it isn't driving an inductive load. So I read in an application note that IGBT power losses are ...
2
votes
1answer
578 views

Problems with IGBT driving

this is my first question, so please be patient with me :-) The problem is with IGBT we are using, IRG4PC40S datasheet available here> link It has to control a 1kW heat block to keep a temperature ...
2
votes
2answers
437 views

Stray-inductance and capacitance of non-isolated heat-sink

I read an application-note that says the heat-sink (when not electrically isolated), is one of major source of EMI. Well I think this can be corrected at some point by good EMI filters and a good case ...
2
votes
1answer
3k views

High side N-Channel IGBT/Mosfet drive methods

According to this paper http://www.fairchildsemi.com/an/AN/AN-9742.pdf "However, a transformer may cause half bridge crossconduction due to the offset voltage of gatepulse deadtime stage." ...
2
votes
1answer
533 views

DC bus inversion to 3 phase AC modified sine wave using IGBTs

I'm working with a variable voltage inverter. I have 3 phase AC voltage coming in at 480V RMS line to line. It hits a full wave SCR front end, has a DC bus link, and is inverted with IGBTs to created ...
2
votes
6answers
485 views

Controlling the frequency of AC used to energize an electromagnet

I am trying to build an electromagnetic pendulum which essentially has a pendulum arm with a permanent magnet at its end which is 'kicked' by an electromagnet placed at the mean position to drive the ...
2
votes
1answer
493 views

adjustable IGBT current?

Goodmorning all, Here my very first question so I may be asking something that is may be already answerd but I couldn't find, My question is : How is current limiting achieved in modern IGBT based ...
2
votes
1answer
1k views

Igbt for AC 32A switch

I have been around this forum, and I am not sure I found my answer. I would like to realize a small and cheap AC switch. Relays being too big, I got interested in IGBT. The goal is to turn on and off ...
2
votes
1answer
706 views

half bridge IGBT not switching high side on

I have designed a PCB with a FAN73933 half bridge driver. It is designed to drive 2 IGBTs (FGH40N60SMD) with +- 170V rails. I have attached a schematic for better understanding. The problem is I can ...
2
votes
1answer
634 views

IGBT Logic Switch

I am trying to make a switch with an IGBT STGP19NC60HD. Here is a link to the data sheet. My simple circuit looks like this: simulate this circuit – Schematic created using CircuitLab Im sorry ...
2
votes
2answers
820 views

IGBT-based capacitor charge transfer and thyristor-based capacitor discharge

simulate this circuit – Schematic created using CircuitLab I am designing a circuit to provide a couple of strong and fast current pulses (~1000 A, more current is better, ~100 us, half-sine) ...
2
votes
1answer
796 views

Synchronous rectification in IGBT

simulate this circuit – Schematic created using CircuitLab In above standard 3-ph IGBT based inverter circuit suppose Diode D4 is carrying current because of inductive nature of load. If ...
2
votes
2answers
2k views

Safely driving a high power h bridge with optocouplers

I was looking into some high power H bridges (I was hoping to make an induction heater or at least a high voltage power supply). Some I came across are: this, this and this, to name a few. I noticed ...
2
votes
2answers
7k views

How to check an IGBT

I want to check an IGBT FGA25N120ANTD whether it is broken or not. I have a good multimeter. I followed some online videos I cannot figure out the right way. Could you please help?
1
vote
3answers
689 views

Transistor Amplifier Classes

There are many different power amplifier classes for transistors, like: A, B, A/B, C, D, etc. But as I searched through the internet and I only found those classes referring to BJTs. What about JFETs,...
1
vote
3answers
2k views

High current, low voltage switch

I have a serious hobby coilgun project powered by a 6S (25V) LiPo Battery. Currently i have the LiPo, capable of at least 600A burst current connected to a ~75mOhm circuit for some 300+A of peak ...
1
vote
1answer
58 views

TO-247 High Voltage pin clearance

I am using IXYH16N170CV1 IGBT's mounted at the edge of a PCB. The legs will be long and bent back to reach the heatsink shown in the image. This device is rated for 1700 V and 16 A. My nominal ...
1
vote
1answer
352 views

How to create high voltage levels for high side input of a driver?

I need to charge and discharge a capacitor up to supply Voltage and down to GND level. Supply voltage of the system may change between 120V and 60V. Also, to drive capacitor charge/discharge switch, I ...
1
vote
2answers
205 views

IGBT destroyed. Help me identify any potential problems

I am trying to build an inductive oven control (for temperatures up to 1500 C), that controls the temperature by turning on the the inductive oven on and off like a commercial inductive hotplate. ...
1
vote
1answer
1k views

How does carrier frequency and pulse width modulation in a VFD work together to control AC motor speed?

There is a lot of online information about this but there is also a lot of contradictory information. What is carrier frequency exactly and does it stay the same or does it vary? I understand the ...
1
vote
2answers
79 views

Repairing failed board trace

I am replacing some igbt transistors on a circuit board from my Samsung TV. While de-soldering one of the 4 components one of the traces from the gate lead fell off. I am looking for the best ...
1
vote
2answers
93 views

How can earth fault meter work through inactive IGBTs

I have a setup with a Bender IRDH375 connected to the DC bus of an IGBT based inverter. If I connect a 50kOhm resistor to earth while running the inverter, it detects it well. That part is reasonably ...
1
vote
2answers
729 views

How can an active rectifier block current?

This is a 2 part question for my understand about how an MOSFET/IGBT based active rectifier controls current. 1) Assuming a 3 phase active front end to a DC bus, and some huge load on the DC bus ...
1
vote
2answers
724 views

What transistor or combination of transistors should I use to make a fully controllable AC switch?

Suppose I want to switch AC. I want to control (allow, prevent, or interrupt) current flow in either direction. SCRs won't do because I want to interrupt current, and I don't recall seeing many IGBTs ...