How to Connect Arduino and TLP to Drive Series IGBTs Without Pulse Transformer or Extra PSU

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How can I drive back-to-back IGBTs from an Arduino with a TLP optocoupler without using a pulse transformer or separate gate-drive supply, and how should the emitter ground be connected?

You cannot drive the IGBT gates from the TLP without an isolated gate-drive supply; use the TLP as the isolated driver and power its output side from a small isolated DC-DC converter instead [#21680425] A pulse transformer is not a good substitute here, because the TLP already provides isolation and a pulse transformer only provides pulses, not a constant gate drive [#21680429] For back-to-back IGBTs used as an AC switch, tie the emitters together and connect them to the negative side of the DC-DC converter [#21680431] Rick reported a working implementation using an FOD3184 optocoupled driver, an SPU01L-15 isolated supply, 10 ohm resistors from the driver output to each gate, and SS14 Schottky diodes across the resistors as Miller clamps [#21680431] Use one DC-DC converter plus one driver per IGBT pair [#21680433]

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#1 21680424 07 Aug 2018 10:02

jacob thomas jacob thomas

Anonymous

Post #1
21680424 07 Aug 2018 10:02

Hi i a need to drive a series of IGBT using arduino and TLP , but i am doubtful about the common emitter ground link of IGBT and TLP. Kindly suggest me a design without pulse transformer and separate power supplies.
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Need a separate isolated gate-drive supply
#2 21680425 08 Aug 2018 18:04

Rick Curl Rick Curl

Anonymous

Need a separate isolated gate-drive supply
Post #2 21680425 08 Aug 2018 18:04

Hi Jacob-The TLP series is an isolated driver- and for good reason- to keep the high power (and possibly high voltage) stuff separate from the control circuitry. You will need a separate supply for the gate drive. this is not terribly complicated, though. You don't need much (average) current to drive an IGBT gate, so a very small isolated DC-DC converter will work. As a starting point, take a look at an SPU01L-15. You can power it from the Arduino.-Rick.
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Emitter grounding issue with back-to-back IGBTs
#3 21680426 08 Aug 2018 21:33

jacob thomas jacob thomas

Anonymous

Emitter grounding issue with back-to-back IGBTs
Post #3 21680426 08 Aug 2018 21:33

Thank you Rick, I am not sure about the availability of that dc dc converter. Can i use separate dc sources for the output power supply of TLP , how about a pulse transformer .Apart from what you have mentioned the problem i faced is the emitter ground of IGBT, since i had some back to back IGBT connections with feedback diodes. it looked like a short when connected to a common ground
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Request for schematic and clarification on pulse transformer use
#4 21680427 09 Aug 2018 18:09

Rick Curl Rick Curl

Anonymous

Request for schematic and clarification on pulse transformer use
Post #4 21680427 09 Aug 2018 18:09

Hi Jacob-The SPU01L-15 is in stock at Arrow, Digi-Key, Chip 1 Stop, Mouser, Allied, Online Components, and Master, so it shouldn't be hard to get one.Are you suggesting a pulse transformer as an alternative to the TLP? It may be possible, but I'll need to know more about your circuit. If you're suggesting a pulse transformer as a way of getting isolated power for the TLP, that's probably not a good idea.If you can post a schematic of what you've got so far I can offer more help.-Rick
#5 21680428 09 Aug 2018 19:30

jacob thomas jacob thomas

Anonymous

Post #5
21680428 09 Aug 2018 19:30

No i am asking whether its possible to connect a pulse transformer at the output side of TLP.thanks in advance
Optocoupled driver preferred over pulse transformer
#6 21680429 10 Aug 2018 01:36

Rick Curl Rick Curl

Anonymous

Optocoupled driver preferred over pulse transformer
Post #6 21680429 10 Aug 2018 01:36

Probably not. The TLP is an isolated driver, and the pulse transformer also provides isolation. You can use a non-isolated driver to drive the pulse transformer.In my opinion, pulse transformers are much trickier than an opto-coupled driver. As its name implies, the pulse transformer can only provide a pulse, while the opto driver can be constantly on. Can you provide more information about your circuit? I may be able to offer a better solution.-Rick
Using isolated DC supplies for each IGBT gate
#7 21680430 10 Aug 2018 14:36

jacob thomas jacob thomas

Anonymous

Using isolated DC supplies for each IGBT gate
Post #7 21680430 10 Aug 2018 14:36

The circuit consists of back to back connected igbt with fly back diodes ..so now i am tryng with isolated dc supplies to each igbt to avoid any common ground problem...i left the idea of using pulse transformer since it is diminishing my pulses. The driver circuit is getting pulses from controller at the input of tlp and at the output separate dc sources are powering the igbt gate through tlp.
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FOD3184 and SPU01L-15 IGBT driver setup
#8 21680431 11 Aug 2018 04:39

Rick Curl Rick Curl

Anonymous

FOD3184 and SPU01L-15 IGBT driver setup
Post #8 21680431 11 Aug 2018 04:39

One of my more recent designs uses two back-to-back IGBT's with Copack diodes as an AC switch. I used an FOD3184 optocoupled driver and the SPU01L-15. It worked great!
I have the emitters tied together and to the negative side of the DC-DC converter. I have a 10 ohm resistor from the output of the FOD3184 to each of the gates. I added an SS14 Schottky diode across each of the resistors to act as a Miller clamp. Very simple and very reliable. I'm switching 240 volts, 50 amps at a 19.5Khz rate.

-Rick
#9 21680432 11 Aug 2018 18:53

jacob thomas jacob thomas

Anonymous

Post #9
21680432 11 Aug 2018 18:53

Dats great, i think it will work, but what if you have multiple dc sources along with back to back switches .thanks
#10 21680433 13 Aug 2018 19:16

Rick Curl Rick Curl

Anonymous

Post #10
21680433 13 Aug 2018 19:16

You mean multiple AC sources? Just use one DC-DC converter (plus one driver) per IGBT pair.-Rick
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Topic summary

The discussion addresses driving series-connected IGBTs using an Arduino and TLP optocoupler drivers without employing pulse transformers or separate power supplies. The TLP series provides galvanic isolation between control and power circuits, necessitating isolated gate drive power. A recommended solution involves using small isolated DC-DC converters such as the SPU01L-15 to supply the gate drive voltage. Pulse transformers at the TLP output are discouraged due to complexity and pulse distortion. For back-to-back IGBT configurations with flyback diodes, common emitter grounding can cause short circuits; thus, isolated DC supplies per IGBT or IGBT pair are advised. A practical design example uses FOD3184 optocoupled drivers with SPU01L-15 converters, tying emitters together to the negative side of the isolated supply, including gate resistors and Schottky diodes as Miller clamps for stability. For multiple AC sources or IGBT pairs, separate isolated DC-DC converters and drivers per pair are recommended to maintain isolation and proper operation.
AI summary based on the discussion. May contain errors.

How to Connect Arduino and TLP to Drive Series IGBTs Without Pulse Transformer or Extra PSU

How can I drive back-to-back IGBTs from an Arduino with a TLP optocoupler without using a pulse transformer or separate gate-drive supply, and how should the emitter ground be connected?

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Topic summary