Author Topic: Phase Lead Tuning without differential probes?  (Read 1638 times)

Offline GrantV

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Phase Lead Tuning without differential probes?
« on: April 09, 2021, 01:37:33 PM »
Hi there,

Is it possible to do phase lead tuning (UD2.7C) using a scope without differential probes?

Yes, I am feeding my inverter from a isolation transformer and my scope is mains powered. As such I am ok with scoping the EC on one of my IGBT's but do not know what to do about the current sense scope lead hookup?

« Last Edit: April 09, 2021, 06:04:37 PM by GrantV »

Offline Hydron

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Re: Phase Lead Tuning without differential probes?
« Reply #1 on: April 09, 2021, 08:24:55 PM »
Current sense should be via a CT (current transformer), with no galvanic connection = already isolated. Use the same CT setup as you use for feedback except with 10 ohms or something across the output as a burden (measure the voltage across this with the scope, output will be input current * burden resistance / CT turns ratio).

You don't actually need to isolate the inverter to scope the voltage either (especially if it's a voltager double config with neutral feeding the capacitor centre-point), just scope from earth to the bridge output with a 100x probe and you'll see enough to tune the phase lead (output may be riding ontop of a mains voltage however, depending on the rectifier setup).

Offline Da_Stier

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Re: Phase Lead Tuning without differential probes?
« Reply #2 on: April 09, 2021, 08:28:46 PM »
Not quite a real answer but if you have a somewhat modern scope you could use two channels and a math trace to show A-B for a differential signal.
Like this you could avoid using a differential probe.

Offline davekni

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Re: Phase Lead Tuning without differential probes?
« Reply #3 on: April 10, 2021, 04:14:05 AM »
If you are using UD2.7 or similar, you can scope across R1 (the 51-ohm feedback CT load resistor on the UD2.7 ECB) to measure current.  That along with Vce of one of the low-side IGBTs is all you need.

Often you can see the IGBT switching glitch capacitively-coupled to the current signal across R1 when phase lead is insufficient.  There are usually much worse switching spikes when phase is lagging, as IGBT diodes are conducting when the opposite IGBTs turn on, forcing rapid reverse-recovery of the diodes.  It is often possible to adjust phase lead looking at only the current signal by monitoring the switching glitch position and amplitude.
David Knierim

Offline GrantV

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Re: Phase Lead Tuning without differential probes?
« Reply #4 on: April 11, 2021, 11:23:47 AM »
Hi guys,

Hydron, Da_Stier and Dave, thank you very much for your answers! That is exactly the info I was looking for :-)

Really just wanted to make sure that I was on the right track and not about to blow my scope  ;D

Should have some sparks soooon!

High Voltage Forum

Re: Phase Lead Tuning without differential probes?
« Reply #4 on: April 11, 2021, 11:23:47 AM »

 


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