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Old 29th June 2020, 05:44 AM   #31
tvicol is offline tvicol  Europe
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Ideal Bridge second GB
analog_sa,

The bridge was tested at the input o 2 different SMPS, one 1,2KW and one 400W. Both have input choke filters. Regulators will deal just fine with spikes generated at power on/off.
My amplifier have the 1,2KW SMPS and Saligny HV bridge will stay there. There is no way to come back to a normal or Schottky bridge.

The HVHV limitations have been presented in the first thread.
With on board regulators, I consider safe his use up to 300Vac This mean you will get at the output 425V.
Over this voltage the bridge may be used, with external un/regulated 15V power supply, up to 400Vac, respectively at 565Vdc output.

Those limitations are imposed by board internal regulators - 450V - and by the mosfet type used - 650V.

Regards,
Tibi
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Old 29th June 2020, 06:43 AM   #32
tvicol is offline tvicol  Europe
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Ideal Bridge second GB
One very important observation.
In order to work properly, Saligny LC, Stantard and HVHF need output filter capacitors.
This bridges are self-powered. At very first start internal body MOSFET diodes are used as rectifiers. As soon output voltage reach threshold operation, MOSFET's are activated. In order for this to happen, an output capacitor filter is needed.

Saligny HC have a different mode of operation and may be used without output capacitors.

Regards,
Tibi
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Old 29th June 2020, 06:46 AM   #33
analog_sa is offline analog_sa  Europe
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Thank you!

Not sure if the smps choke input is directly comparable to what is typically used with valves. Do you have any data on the chokes? Are they above critical inductance?

Otoh, the spikes are not nearly as high as i feared as these boards have output caps, perhaps around 1uF which makes true choke input impossible.


Ha, ha. I wrote this at the same time as your post.
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Old 29th June 2020, 06:55 AM   #34
tvicol is offline tvicol  Europe
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In tube rectifiers, usually large chokes, are used after rectifier in CLC filters.
Saligny HVHF have two fast diodes that will protect board regulators in case any spike output voltage will exceed input.

Except SMPS, if you know any specific application where choke is before rectifier, please let me know.

Regards,
Tibi
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Old 29th June 2020, 07:46 AM   #35
analog_sa is offline analog_sa  Europe
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Assuming 1uF at the board output, this is what i have in mind. A short spike exceeding 700v.

It is probably better to simulate in Ltspice with proper choke/transformer parameters but this gives an idea.
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Old 29th June 2020, 05:06 PM   #36
tvicol is offline tvicol  Europe
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I can do better than a simulation.

Saligny HVHF directly connected to 220V mains, a huge 5H choke a 220uF/450V cap and HMN regulator.
Seems that I have to adjust some resistors on that HMN regulator.

Regards,
Tibi
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Last edited by tvicol; 29th June 2020 at 05:10 PM.
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Old 30th June 2020, 01:10 AM   #37
meanie is offline meanie  Singapore
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Quote:
Originally Posted by tvicol View Post
analog_sa,

The bridge was tested at the input o 2 different SMPS, one 1,2KW and one 400W. Both have input choke filters. Regulators will deal just fine with spikes generated at power on/off.
My amplifier have the 1,2KW SMPS and Saligny HV bridge will stay there. There is no way to come back to a normal or Schottky bridge.

The HVHV limitations have been presented in the first thread.
With on board regulators, I consider safe his use up to 300Vac This mean you will get at the output 425V.
Over this voltage the bridge may be used, with external un/regulated 15V power supply, up to 400Vac, respectively at 565Vdc output.

Those limitations are imposed by board internal regulators - 450V - and by the mosfet type used - 650V.

Regards,
Tibi
Hi,

Any chance this can be used with our local main supply to be 230Vac?
If so, i would like to buy some.

Thanks.
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Old 30th June 2020, 04:49 AM   #38
tvicol is offline tvicol  Europe
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Yes, will work.

Regards,
Tibi
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Old 30th June 2020, 06:51 AM   #39
analog_sa is offline analog_sa  Europe
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Quote:
Originally Posted by tvicol View Post
Saligny HVHF directly connected to 220V mains
It will be more convincing @320v AC and a series of on/offs, preferably automated as this is the only instance of risk. What is the choke dc resistance?

Looks like i shall be ordering a few boards with the explicit intention to find out the limits of safety with inductive inputs following the attached circuit. Transistor types are different from the indicated, only used those for the footprints.
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Old 30th June 2020, 07:25 AM   #40
tvicol is offline tvicol  Europe
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130ohm.

The grid of X20 must be connected to Vcc2.
BSS123 is not the right choice here.
Otherwise you are on the right track!

Regards,
Tibi
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Last edited by tvicol; 30th June 2020 at 07:31 AM.
 

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