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Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
No. The Weinberg converter doesn't store any energy in the transformer. The energy is supplied to the secondary during the time that the FETs are on, which makes it a forward converter. Any stored energy is stored in what that paper calls the "Weinberg inductor", which is basically a boost inductor.
The "improved" version puts a secondary winding on the Weinberg inductor that connects to the output rectifier, so I guess the Weinberg inductor is now a flyback transformer that discharges to the output when both FETs are off. But this mode only contributes part of the output power.
Boost converters don't have the efficiency issues of flyback converters, because the inductor has only one winding, hence there's no leakage inductance to cause losses.
Registered Member #2901
Joined: Thu Jun 03 2010, 01:25PM
Location:
Posts: 837
When the FETs are on the magnetic fields in the primaries of the push-pull transformer cancel each other out, all the energy is stored in the flyback transformer..
Registered Member #2901
Joined: Thu Jun 03 2010, 01:25PM
Location:
Posts: 837
I linked it because it was a one of the few free papers I could find. There is a step by step explanation of the operation, for boosting, of a ZVS version in ... "A New Active Clamping Soft Switching Weinberg Converter" which is only on IEEEXplore.
wrote ... Interval 1: In this interval both main switches are on. Since magnetic fluxes of push-pull transformer are in opposite direction of each other , this transformer is short circuited. Therefore Vin is applied across the flyback transformer and the energy is stored in flyback magnetizing inductor.
Interval 2: When S1 is turned off, this interval starts and after this instant the energy stored in previous mode is transferred to the load through D3. The voltage applied across the flyback transformer changes its polarity and the current through this inductor decreases.
There are other people who made normal flyback designs at >>100 Watt for various reasons at >90% efficiency.
(I'm not in love with the design, sure, the diodes provide a very fast clamp in this configuration ... but you need a lot more windings on the secondary for the same output voltage as a traditional flyback, because you don't actually want the clamp to kick in much.)
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
I still think they could have got some more optimal combination of cost, component count and efficiency if they had used a forward-derived converter instead of a flyback.
I also don't believe that any power supply by Glassman etc. ever used a flyback-derived converter to drive its CW stack.
I'm not going to argue it any more, maybe Richie Burnett will drop by and smack you round the head.
Registered Member #1938
Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 701
Finally the schematics. Plain & simple, the caps are 2.2nF/7.5KV the diodes have no markings (probably they were custom-made for these supplies), the HV resistors for the divider are 150MOhm.
With your help I trust I can revive them. As I said I have 2 half wave Glassman multipliers, one a negative and the other a positive (I also have a full-wave Glassman multiplier, there's a photo in the first post).
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
radhoo wrote ...
Finally the schematics. Plain & simple, the caps are 2.2nF/7.5KV the diodes have no markings (probably they were custom-made for these supplies), the HV resistors for the divider are 150MOhm.
With your help I trust I can revive them. As I said I have 2 half wave Glassman multipliers, one a negative and the other a positive (I also have a full-wave Glassman multiplier, there's a photo in the first post).
.
I think the diodes you want are EDI RM800B, these are apparently the closest standard diode to the custom diodes manufactured for Glassman by EDI.
Registered Member #1938
Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 701
Thanks, Ash.
On the schematics I've also printed the board's ID. Do you perhaps have access to the original schematics, including the driver?
I still try to resist the temptation of connecting a 555 timer driver to this board, but I should come with a better solution soon, since I really want to power it up.
Registered Member #2901
Joined: Thu Jun 03 2010, 01:25PM
Location:
Posts: 837
radhoo wrote ...
What would be a good start for creating a driver for this supply?
If you could make two switch flyback work and spite mr. McConner you'd be my hero :) (I have changed my mind, all the other circuits to regenerate energy from leakage induction are hopelessly complex.)
Realistically though some kind of oscillator. Couldn't you just use an existing LLC driver IC? They come with current limiting build in.
wrote ... How to efficiently use the divider to 1) measure the output
What kind of bandwidth do you want? If <MHz is enough use another Rdd/Rdb/Cd circuit, with Rdd replaced by a resistive divider. Maybe a JFET opamp buffer depending on what is going to be hanging off it.
Ooops, scratch that ... didn't see it was connected to the bottom of the multiplier ... hmm, don't immediately see how that is supposed to work.
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Glassman HV Supply
