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Old 25th December 2016, 01:51 PM   #1
kartino is offline kartino  Indonesia
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Default Fullbridge Class D PA ultra high power

Guys,
Sorry that I have no much time for this forum. Here is my fullbridge. Capable to be supplied +/- 90Vdc. Plenty power output. Yes... you need to tweak by yourself such as dead time by adjust R gate mosfet. And maybe uH inductor to suit your speed. But this topology is working.

.asc file is attached to PDF.
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File Type: pdf D2KFB - Fullbridge V.1a.pdf (136.7 KB, 293 views)
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Old 25th December 2016, 02:09 PM   #2
kartino is offline kartino  Indonesia
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DC Protection and Front panel signalling.
It can use same bias supply so no extra supply for relay
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File Type: pdf DC Protection FullBridge v.2.pdf (27.4 KB, 131 views)
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Old 9th January 2017, 06:23 AM   #3
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hi
very good
have tested pcb for this?
i want to test it
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Old 9th January 2017, 01:35 PM   #4
Eva is offline Eva  Spain
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No current limiting and no way to implement it without changing to a different driver IC scheme or a different supply/ground topology, or adding a few dozen parts either as rail sense or floating sense. Pre-filter feedback, so more useful for LF duty.

TL07x is not the best choice for this application because that kind of chips are OK for their pricing but have a funny -PSRR charactetistic: around crossover frequency (3Mhz) the output exhibits amplification for the voltage difference between the output and negative rail, so any fast spike either as input command or as output load causes HF output bounce. In practice TL07x is OK when the spikes and related inaccuracy do not matter (linear circuits with no spikes, or proper consideration with spikes at the input and/or (100r,1n) to GND at the output to avoid disturbance entering. LM83x and MC3307x is a different kind of audio op-amp in the same price range that does not have the vulnerabilities of TL07x but have other, high input noise current, dictating the use of low value resistors, but this is always less trouble than bounce at the output of an op-amp used as class D modulator.
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Last edited by Eva; 9th January 2017 at 01:53 PM.
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Old 9th January 2017, 01:55 PM   #5
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And?
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Old 9th January 2017, 07:05 PM   #6
Pafi is offline Pafi  Hungary
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Eva,

Are you back? Nice to see you!

Have you seen the "decoupling" caps of OPA? :-)
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Old 9th January 2017, 07:41 PM   #7
Eva is offline Eva  Spain
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And? Even TPA chips have a basic short circuit detector. Otherwise in case of output short DC protection relay opens but it does not open until output stage is toasted enough to produce DC.

I'm ubiquitous, I'm never leaving or coming back.
Yes, seen the decoupling, some superstition taking place hehe
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Last edited by Eva; 9th January 2017 at 07:47 PM.
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Old 9th January 2017, 09:40 PM   #8
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Thanks.
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Old 10th January 2017, 03:24 AM   #9
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Looks good, if not allowed to clip and output shorted.
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Old 10th January 2017, 04:34 AM   #10
kartino is offline kartino  Indonesia
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Quote:
Originally Posted by Eva View Post
No current limiting and no way to implement it without changing to a different driver IC scheme or a different supply/ground topology, or adding a few dozen parts either as rail sense or floating sense. Pre-filter feedback, so more useful for LF duty.

TL07x is not the best choice for this application because that kind of chips are OK for their pricing but have a funny -PSRR charactetistic: around crossover frequency (3Mhz) the output exhibits amplification for the voltage difference between the output and negative rail, so any fast spike either as input command or as output load causes HF output bounce. In practice TL07x is OK when the spikes and related inaccuracy do not matter (linear circuits with no spikes, or proper consideration with spikes at the input and/or (100r,1n) to GND at the output to avoid disturbance entering. LM83x and MC3307x is a different kind of audio op-amp in the same price range that does not have the vulnerabilities of TL07x but have other, high input noise current, dictating the use of low value resistors, but this is always less trouble than bounce at the output of an op-amp used as class D modulator.
Eva,

Thanks for your comments
I fully agree.
For current limiting, as this is just started, not.yet impemented.
TL071 can be swapped with better op amp.

It is still on test. Still problem with mosfet shoot thru on heavy loading. It needs carefuly layout and to stabilize switching behaviour. Your suggestion is welcome
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