Questions tagged [igbt]

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

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203 views

IGBT naming question

I was looking at this site http://www.electronics-tutorials.ws/power/insulated-gate-bipolar-transistor.html Here an IGBT is an NMOS with a BJT> But the BJT looks to be a pnp device. When the NMOS ...
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120VAC to 90VDC Power Supply (for DC Stepper Motors)

I'm currently an electrical engineering student working on building a 3 degree of freedom motion simulator using three 90V DC Stepper Motors. Each motor can draw up to 5 A so I need to find or build a ...
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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 ...
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1answer
495 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 ...
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2answers
733 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 ...
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1answer
755 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 ...
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2answers
835 views

Why this pair of IGBT's died silently?

Before some days I have taken a look at circuit which controls AC current's frequency. That circuit was a VFD which looks like: simulate this circuit – Schematic created using CircuitLab But ...
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1answer
1k views

How to set phase delay for a three phase igbt rectifier

I have a three phase igbt rectifier like so. three phase voltage = 690V. how to set the phase delay and DC link capacitor value(F) to get Vdc = 1070. I have updated the complete simulation with the ...
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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 ...
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2answers
4k views

IGBT vs. SCR rectifier

I simulated three phase rectifier using a thyristor like so: I get the expected result. But if I change the thyristors to IGBTs as shown below, it does not work. Why do these two circuits behave ...
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1answer
534 views

High side IGBT for negative voltages [closed]

I am trying to figure design a circuit using IGBT whose collector is connected to 0V (machine ground) and emitter is connected to -800VDC (negative). I am using IRS2113 high side low side driver. How ...
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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 ...
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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 ...
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2answers
143 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 ...
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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 ...
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343 views

Output characteristics of power transistors

The book about electronics that I'm currently reading only briefly mentions IGBTs and power mosfets(such as the VMOS, or the HEXFET), and gives no depiction of the output characteristics. The image ...
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1answer
579 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 ...
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1answer
1k views

High current Synchronous Buck Converter, MOSFET or IGBT?

I am supposed to design a synchronous buck converter (to be driven by micro controller control signals for switching purpose). The input Voltage range is 10V-15V, and output voltage range is 4V-5V but ...
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1answer
1k views

Simple High Side IGBT Switch

I'm trying to design a capacitor discharge circuit for a hobby rocket launching system. In some cases we have long wire runs with multiple rockets so a CD circuit seemed the way to go. I'm trying to ...
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1answer
555 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 ...
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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 ...
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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?
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1answer
271 views

Need help on proper circuit connection

I am trying to test IGBT switching using the following circuit but the IGBT smoked out. I am using MSP430 with g2553 chip, NMK0505SAC dc-dc converter, FOD3184 optocoupler and IRG4BC20UD. Please help ...
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2k views

How to drive an IGBT with an optocoupler?

What's the proper schematic for driving the IGBT (IRG4BC20UD) from a microcontroller (MSP430-g2553) pin through the optocoupler (FOD3184)? I am going to design a full bridge inverter to drive 9W CFLs (...
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1answer
708 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 ...
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0answers
114 views

MOSFET Behavior During Pulsed Operation

I am trying to use back-to-back MOSFETs/IGBTs to isolate my pulsed supply from my load. In theory, I will switch on the MOSFETs, and the pulsed supply will be attached directly to the load (but not on ...
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1answer
800 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 ...
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2answers
370 views

Can a digital input having internal pull up resistor drive a load?

simulate this circuit – Schematic created using CircuitLab I am working on MC56F8006 DSC . On power up or reset the default state of all GPIOs is inputs with internal pullups enabled. I am ...
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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 ...
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1answer
862 views

Capacitor discharge: Is gate voltage on IGBT proportional to collector?

I'm designing a capacitive discharge circuit. I'd like to get some feedback before I buy parts for testing. The output should be around 100v and thought an IGBT would work great in discharging the ...
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2answers
438 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 ...
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1answer
264 views

How does a true sinewave inverter work?

I am an Electrical Engineering student, and when we were taught about inverters (at a power electronics course) we studied inverters using Sinusoidal Pulse Width Modulation. My question is do the so-...
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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 ...
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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 ...
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3answers
317 views

Is it meaningful to describe an IGBT as desaturating?

I've heard IGBTs described as desaturating if too much current passes through them, particularly in the context of drivers with desat protection. My understanding of an NPN BJT is that it is in ...
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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 ...
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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 ...
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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 ...
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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 ...
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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." ...
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1answer
4k views

PWM switching in a 3-level inverter

I am new to the pwm switching technique. Here I have the output waveform of a 3 level inverter with normal switching and switching using pwm pulses. (a)Phase-A, (b)...
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2answers
713 views

IGBT's Ic (peak current): why always 2 times of Ic

I would like to know: 1) Why, almost on every IGBT datasheet that \$I_{cm}\$ (maximum peak current) is 2 times \$I_c\$? - for example see datasheet How, can I measure this \$I_{cm}\$, to verify that ...
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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 ...
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1answer
142 views

Temperature dependance of IGBT max collector current

I have an IGBT (datasheet), that I am using as a switch for a coilgun. How would I calculate the maximum pulse collector current in function of the ambiant temperature and time? Also, if we're ...
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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, ...
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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 ...
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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 ...
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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 ...
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1answer
560 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, ...
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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 ...