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Questions tagged [igbt]

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

0
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1answer
834 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 ...
3
votes
1answer
497 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 ...
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
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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
260 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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2answers
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 (...
2
votes
1answer
597 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 ...
1
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0answers
106 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 ...
2
votes
1answer
710 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 ...
1
vote
2answers
361 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 ...
2
votes
1answer
6k 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 ...
0
votes
1answer
796 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 ...
2
votes
2answers
401 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 ...
0
votes
1answer
250 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-...
3
votes
2answers
341 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 ...
1
vote
2answers
666 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 ...
1
vote
3answers
284 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 ...
2
votes
1answer
584 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 ...
9
votes
6answers
18k 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 ...
4
votes
4answers
948 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
4answers
11k 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 ...
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." ...
1
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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)...
1
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2answers
653 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 ...
13
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 ...
1
vote
1answer
139 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 ...
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, ...
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 ...
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 ...
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 ...
9
votes
1answer
538 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, ...
2
votes
2answers
675 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 ...