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Synchronous Rectification
Synchronous Rectification
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Old 25th May 2010, 09:43 PM   #1
mgm2000ro is offline mgm2000ro  Romania
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Default Synchronous Rectification

Hello, this method from synchronous rectification is good ?
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Old 26th May 2010, 02:07 AM   #2
Sch3mat1c is offline Sch3mat1c  United States
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No, this is better.
http://myweb.msoe.edu/williamstm/Ima...409_Schem2.png
http://myweb.msoe.edu/williamstm/Ima...409_Schem3.png
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Old 26th May 2010, 02:12 PM   #3
mgm2000ro is offline mgm2000ro  Romania
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Hello and thank you for the schematics.
I've looked at them and from what I can tell the differences are the mosfter polarity and the
direct command of the mosfets from the totempole, with a ground common to the PWM integrated circuit.

The reversed polarity of the mosfets works in my case but I can't use a common ground, that's why
I went with a GDT command.

To me they look mostly identical, please correct me if I'm wrong.
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Old 27th May 2010, 05:49 AM   #4
Sch3mat1c is offline Sch3mat1c  United States
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The two sets of rectifier transistors have to be on simultaneously, while the inverter transistors are off. A GDT cannot provide this action.

Tim
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Old 27th May 2010, 06:27 AM   #5
mgm2000ro is offline mgm2000ro  Romania
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I'm confused, do you mean whit GDT i have no power to turn off large input capacitance of rectifier mosfet? I can add an pnp transistor to turn off rectifier mosfet.
What is your opinion?
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Old 28th May 2010, 10:50 PM   #6
Sch3mat1c is offline Sch3mat1c  United States
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No.

The required waveform is fundamentally different.

This is the inverter waveform (top), and drain waveform at the rectifier, with gate drive disconnected.
Click the image to open in full size.
Both rectifier transistors must be turned on during dead time (shown here at +12V).

Tim
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Old 29th May 2010, 06:47 AM   #7
orfeus is offline orfeus  Greece
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I suggest you the LTC3722. It's expensive but it gives much more design flexibility. It can be cooperate with a second stage controller to make various modifications. The problem is that you will have to deal with full bridge rectification. Download and the software. It will help you.
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