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Ideal bridge rectifier GB
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Old 9th November 2019, 04:08 PM   #321
The traveller is offline The traveller
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Originally Posted by analog_sa View Post
Thanks to a very observant friend who noticed the frequency of ripple, the mystery shrouding the weird synphase connection has finally been revealed

It is perhaps worth warning any adventurous synphasers that in this mode the 4320 works as a parallel half wave rectifier with the obvious increase in ripple. It may be appropriate for this info to also find a spot within the first post of this thread.

The 50Hz ripple can be seen in both simulation and measurements.

In the standard unipolar connection the 4320 applies out of phase control signals to the opposing fets in the bridge, emulating the behaviour of a standard diode bridge. In the synphase connection this changes and the opposing fets get synphase signals at their gates, effectively working in parallel.

Below is the 50Hz ripple waveform from the synphase simulation. In the standard connection this is of course 100Hz.

On the plus side this is an elegant way to achieve half wave rectification without passing dc through the transformer secondary.
Hi analog_sa
So you are saying that these boards produce a half rectified dc?
Is a full wave rectification possible with the 4320?
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Old 9th November 2019, 06:23 PM   #322
analog_sa is offline analog_sa  Europe
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Ideal bridge rectifier GB
I am not saying this at all. The standard datasheet connection certainly produces a full rectified output. It is only the centre tapped connection which produces half wave rectified output which is no big deal since factory made centre tapped transformers are incompatible anyway.

The only way possible to obtain a fully rectified bipolar supply is to use a transformer with separate secondaries and separate 4320 boards. In this sense the opening post in this thread is misleading and should be corrected.
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