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Thread: vacuum tube smsp

  1. #1

    vacuum tube smsp

    I am going to make smps to apply to vacuum tube amplifiers.
    So far, the sg3525 and ir2110 have been used to produce more than 450V 1A, but there are many defects.
    I want to hear advice from an expert.

  2. #2

    tube smps circuit

    This is the schematic I made.
    Check if there is a problem with the circuit.
    Attached Files Attached Files
    Last edited by eonscom; 03-04-2019 at 03:56 PM.

  3. #3
    The problem seems to be that the high frequency is distorted by the fine noise coming out of the output
    Attachment 6890

  4. #4
    .... Silvio's Avatar
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    Quote Originally Posted by eonscom View Post
    This is the schematic I made.
    Check if there is a problem with the circuit.
    Do you intend to regulate the output voltage?
    Did you check the dead time on the gates?
    What current draw is there on the HV output?
    What is the value of the output inductor?

  5. #5
    The output voltage only applies to rectified
    I am looking for a way to adjust the voltage

    There is enough dead time.
    I applied a 100 ohm resistor and there was no problem when viewed on a scope

    Not HV
    It is the power to heat HT tube heater
    Without vacuuming the tube heater power to dc
    Directly apply high-frequency power to heat

    It was manually wound on the ring core
    I do not know exactly what Henry is.
    See photos
    Last edited by eonscom; 03-05-2019 at 04:33 AM.

  6. #6
    .... Silvio's Avatar
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    If your maximum current lies on the tube heaters then you can sample the output voltage there. You can rectify the voltage only for sample. you can still feed the heater AC.

    The output inductor value is chosen according to the current it is going to handle. If the current is small then the value of the inductor rises.

    A feedback loop can be done with the heater voltage and regulate the pulse width to stabilize the output voltage.

    Something about the circuit. I see no snubber on the primary of the transformer. How pure are your wave forms at load?
    Last edited by Silvio; 03-05-2019 at 06:26 AM.

  7. #7
    The problem is the transformer.
    Bifilar winding of coil to rectify by center tap method
    I changed the end and made the final.
    Even though there is no load, the coil gets hot.
    I do not know what went wrong.

    Applied Trans: ETD49
    Primary: 0.45mm X 5 - 22 TURN
    Secondary: 0.32mm X 2 X 2 - 70 TURN : 450 V expected

  8. #8
    .... Silvio's Avatar
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    Be very careful when winding the secondary. Do not forget that a square wave tend to have a lot of harmonics and also tend to generate spikes. Spikes can also lead to high voltages and can be multiplied in the secondary windings by the turns ratio. (high voltage can arc and destroy the insulation and thus having shorted turns)
    In your case this must be the cause of the secondary winding heating up.

    Turns ratio look good and at 220vac you should have around 490v on the secondary when smoothed with the output capacitor. ( if you have spikes in the primary this can rise to over a 1000v)

    I suggest:-

    1) You insert a snubber across the primary winding this will suppress any spikes as the mosfet switches off.

    2) Post a scope shot of the waveform across the primary winding.

    3) Read this blog post and download the PDF. You will learn about winding practices.
    The link is here

    4) Rewind your transformer in the way explained by the PDF file.

    5) It will help a lot if you leave some space on the bobbin cheeks with the winding. Put a layer of Maylar tape between each winding layer.

    6) Take measurement of the input current and let me know what is it, If you have a watt meter it is better.

  9. #9
    Generating that number of output voltages with that PCB is a huge challenge.

    I also don't understand your idea behind the variable output voltages, i don't see a regulator.

    I think more work is needed to achieve your goal &

  10. #10
    The current image smps is rectified to about 315v and is used as the B + voltage of the tube amplifier
    HER 508 4 diodes are used by bridge rectification.

    Applied Trans: ETD49
    Primary: 0.85mm X 1 - 40 TURN
    Secondary: 0.32mm X 3 - 86 TURN : 315 V

    When applied to the above specifications, the output waveform has a lot of ringing and noise.

    I am making a new transformer to apply the center tap method.

    Excellent -SMPS Transfomer Tool Data
    Attached Images Attached Images
    Last edited by eonscom; 03-13-2019 at 07:50 AM.

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