IGBTs explained Pt 2. and IGBT Induction Heater

Explaining more about IGBTs; Gate driving and Cooling
Plus chiller cooled (refrigerated water) IGBT Induction heater
If you haven't seen the first video (IGBTs explained and IGBT based heater controller) watch it before you watch this.
Once again the video didn't turn out like I wanted it to, I tried, but I might have to make another one.
All images used were found on google images. No copyright infringement intended. used for education only, no profit.

[@PearlofRocketland]

Nice introduction to IGBTs! My PhD involves some power electronics. It's good to see people talking about them on youtube

[@high1voltage1rules]

DAMN your channel is AWSOME!!! wish to god I wish I new as much about IGBT as you!! Ya awsome dude!!! BIG THUMBS UP*

[@MYNICEEV]

Great. I look forward to seeing your results.

[@MYNICEEV]

Great video once again. Could you use a bath of mineral oil? Thanks for sharing.

[@victoryfirst2878]

I have a question for you about controlling four items sequentially on for one second two seconds three seconds four seconds, all items have been turned on and off. The voltage is 120 and the amperes are 15. How would I be able to control the four items using analog methods ??? Thanks

[@subcooledheatpump]

For electroplating, you could built an IGBT chopper with a regular diode rectifier front end. I suspect what you would want is an SCR/Thyristor front end that uses PWM to "chop" the output of a transformer (12 volts)or even the mains directly. Since an inverter isn't needed for electroplating (I assume since it isn't usually) you could use more robost and cheaper semiconductors like SCRs to give a high current DC output

[@subcooledheatpump]

Experience. I buy alot of used IGBTs and other electronics from surplus stores( they are dirt cheap surplus or used ) and experiment until I can make something useful. I try to show what I make in the videos after explaining. The heater control in the previous video, and the induction heater in this video. Both learned from the internet and from experience. Using the PC as a signal generator was just an idea I had for an induction heater. It worked

[@ajayvagadiya3934]

You are using impedance matching transformer in this circuit? Can we hook up directly work coil without impedance matching transformer? I made one induction furnace but that can't reach 8s full performance around 100v that limits the ip current around 12amps can i hook up work coil directly i have 22:5 ratio of transformer

[@Rctrilogy]

Besides the internet How did you learn about all of this electronic knowledge?

[@zeraytekola1093]

Vary helpful video, thank you.Can I use a gate drive manufactured by say Toshiba for an IGBT manufactured by Mitsubishi.

[@subcooledheatpump]

I haven't used Peltier modules specifically for IGBT cooling, but I have experimented with them before. The only thing I really don't like about Peltier modules is their efficiency. A vapor compression refrigeration system is more efficient than a Peltier module, and their efficiency is increasing. A peliter module though is alot more compact so it would be useful where space is tight. Thanks for watching

[@subcooledheatpump]

@definitionofis Yes, I have used them before and I've never had any luck with them. Because they get power right from the DC bus they are prone to noise and therefore I can't say I'd recommend using them. Whenever I've opend up a VFD (motor controller) I've always seen a small high frequency transformer with seperate windings for seperate power supplies for the gate drivers. It's only in lower end electronics that these are good for, the serious stuff never uses them. Thanks

[@badass2063]

hey culd i use IGBT Bricks n a zvs flyback driver?

[@sweetguy19762]

subcooledheatpump Are you running everything on 220?

[@subcooledheatpump]

I have been researching using mineral oil for power electronics cooling. My results are inconclusive. It is possible that I will do my own research with IGBTs in mineral oil. If I do, I will upload my results

[@mbunds]

I would have loved to have seen the temperature delta of the IGBT as you loaded and unloaded the coil...

[@jamest.5001]

hello. I hope you still like talking about power electronics. and helping ppl. because I need help. or advice. I need to build a inverter to power my off grid house. I have basically decided to build multiple inverters. to power a typical 20a 120v circuit. so 24v and 2500w. I was told igbt modules would be best. instead of paralleling MOSFETs. but I must admit. I am intimidated after I checked out a few of your videos. I have a better understanding of MOSFETs. but I don't really see how a MOSFET can carry the current some are rated for. the small legs on the to 220 package. and similar. if I go with MOSFETs what would be the safest way to parallel the FETs. and what's the most current the package can truly handle? on a to220 or to247 package FET? your help is greatly appreciated. thanks

[@subcooledheatpump]

SCRs and Thyristors don't switch fast enough for a high frequency induction heater. They are good for frequencies up to around 500 Hz but IGBTs can usually go to 20 to 30 kHz

[@subcooledheatpump]

I would say that is very possible. I would also agree that generally speaking, household appliances are poorly made. A real quality IGBT induction heater is actually very expensive, and would probably be out of the question for a household budget. So a sacrifice is made in quality to lower the price of many household appliances. This is also true for air conditioners and heat pumps that use IGBT inverters for their motor drives. They work for a while but often times fail prematurely

[@bikefarmbikes]

Cool! Awesome! Fantastic!

[@DriftHyena]

+subcooledheatpump Is it possible to use cooling blocks on IGBTs with a forced air radiator as the heat dissipator, or is a chiller required?

[@subcooledheatpump]

Most basic industrial equipment, such as VFDs and welding machines, uses forced air cooling. However once you start trying for higher power output levels, such as required by an induction heater or an inverter for something like an electric car, then liquid cooling is usually used.

[@ajayvagadiya3934]

What is best for induction heating current fed or voltage fed topology? 🤔

[@subcooledheatpump]

Current source inverters require the load to match the current source, and also commutation diodes. The advantage is, the current is limited passively by the circuit, rather than actively through the power electronics. On the other hand, voltage source inverters require fewer components, and their performance isn't constrained by the load. The disadvantage is, because the current isn't controlled passively, the electronics will have to actively monitor the current to prevent dangerous overcurrents. So for an induction heater, a voltage source inverter has an advantage in that it can be made to use many different sized inductors, the disadvantage is that overcurrents could easily destroy it. A current source inverter in an induction heater has an advantage of being almost impossible to destroy from overcurrents, but the inductor size choices will be limited

[@arrshithrg5359]

Hello I am doing a similar experiment driving 20kw resistive load .The drive topology is neutral balanced halfbridge. The issue is that the capacitors would get hot when driven at higher power like 13kw. Will paralleling up multiple capacitors help?

[@subcooledheatpump]

Yes that would help. A fullbridge is technically a superior design, and you wouldn't need to do much more than what you've already done

[@arrshithrg5359]

@@subcooledheatpump thank you

[@arrshithrg5359]

@@subcooledheatpump when you were driving full bridge induction heater, what type of rectifier were you using, i ask this because I am using two different 3 phase half bridge rectifier to charge dc link capacitor for half bridge inverter driving resistive load and the power factor is 0.6 which is worst.

[@subcooledheatpump]

@@arrshithrg5359 You will need a boost power factor corrector to make it power factor 1, however an inductor or choke can improve the power factor

[@arrshithrg5359]

@@subcooledheatpump yess but inductor for 150hz operation would be really big and heavy right . so i thought of using 3 phase full bridge rectifier(8% ripple factor) without capacitor filter to give dc link voltage to full bridge inverter, what do you think and forgot to mention my load is resistive.

[@donovanpl]

+subcooledheatpump Question: In a MOSET application when would you use a snubber circuit vs a free wheeling diode?

[@subcooledheatpump]

+Donovan Lym You should always use a free wheeling diode unless your load is purely resistive. An inductive load with only a snubber across the power switch will stress the snubber capacitor

[@donovanpl]

I am looking a the IRFZ44N which has a built in diode. Do I need to place another one across the MOSFET?

[@subcooledheatpump]

+Donovan Lym A free wheeling diode is placed in anti-parallel across the load, not across the MOSFET. When the MOSFET switches on, it builds a magnetic field in the load circuit. This effectively charges the load inductance. When the MOSFET switches off, the inductance will reverse the voltage, the anti-parallel diode "catches" the inductance and dissipates it. That is what a free wheeling diode does. If you still don't understand, watch my video called "How to use an IGBT chopper to control DC motors" That should explain everything you need to know.

[@donovanpl]

+subcooledheatpump In one of your videos, you mention shorting out the two leads in the igbt and using that as the diode. Could I do the same with a MOSFET? I'll check on your video shortly.

[@subcooledheatpump]

+Donovan Lym Yes most MOSFETs have a built in body diode

[@representthemoment]

can u plz tell me how can i use the induction cooker circuit for wireless charging without heating of the secondary coil

[@subcooledheatpump]

Increase the number of turns on the coil. Increase the voltage and decrease the current. Induction heating and Wireless power work in a similar fashion to a transformer

[@representthemoment]

for wireless power transfer what is more important voltage or current? and what should i do to charge multiple devices?

[@HighVoltageProjects]

mate your brain is needed in my head ;-)

[@AalokBhatt1989]

Great..:).:)..thank you so much.:)

[@gouravjha2056]

actually I am from India...I am working on the buck convertor by using igbt...I have prepared the igbt pwm pulse from dsppic30f5015 and for driver I used the M57962L ic..when my DC input to the igbt is 325 v.i am getting proper soft start and proper buck voltage on DC capacitor..when DC input to the igbt is 625 v DC ..that time M57962l gives the blocking signal and I am not getting output...please solve my problem.. thanks in advance

[@feolender2938]

Solve your own problem. . . . . you might learn something

[@definitionofis]

I looked at the HCPL-3120 optocoupler and I notice it requires its own power supply. Have you ever used the optocouplers which draw power from across the igbt and store it in a small capacitor and do not need a power supply? Here is one: search digikey com/us/en/products/CPC1580PTR/CLA297CT-ND/1668877 I can guess the disadvantages/limitations. I am curious if you have experience with them.

[@kaptainkraken]

ah! young Hyperspace Pirate

[@naeemansar3524]

can u give circuit diagram with step by step explanation

[@nosuchthing4789]

At MIT yet?

[@srinivasankv6400]

Pls upload it's making video

[@normellow]

Use a cold plate

[@woutnme]

maybe i can help you....