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Set - DC / DC converter 9A XL4016 and panel meter DSN-VC288, assembly, test

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  • #91
    CMS
    Administrator of HydePark
    In such an application, the multiturn is very cumbersome to operate.
  • #92
    lukiiiii
    Level 28  
    Note that when there is no connection in the current potentiometers, the inverter operates at the maximum current setting.
  • #93
    CMS
    Administrator of HydePark
    There is absolutely nothing strange about it.
  • #94
    brofran
    Level 39  
    lukiiiii wrote:
    when there is no connection in the current potentiometers, the inverter works at the maximum current setting.
    And what happens with the voltage regulating potentiometer?
  • #95
    ArturAVS
    Moderator of HydePark/Cars
    brofran wrote:
    And what happens with the voltage regulating potentiometer?

    Output voltage at max.
  • #96
    D¿yszla
    Level 42  
    Weird no, but dangerous :) Better if it worked the other way around.
  • #97
    marcinlas
    Level 12  
    Oh, this inverter for xl4016 is terribly emergency, two pieces have just burned and without load.
    I used an old AC 24V / 300W transformer 20A bridge and the circuit described above on xl4016.
    I received 34V at the input of the converter (and of course I gave several 1000uF / 63V capacitors and foil capacitors for 100nF and 1.5nF / 100V), additionally I replaced the capacitors in the converter so that they were all at 50V and not 35V.
    I replaced these small multi-turn potentiometers with large multi-turn potentiometers (2pln / pc + shielded 20cm cables) such as in the avt store.
    Well, after several dozen switching on, the systems burned themselves without the load applied, first a small balloon flew from where I didn't even notice, then it was impossible to set any value of the output voltage - just the input voltage at the output (probably a mos-fet burned up in xl4016). A terrible embarrassment - apparently with voltages above 30V, the straightener breaks down.
    I do not advise you to buy it, I do not know why these converters are burning like that - actually without fire - you do not even know what has fallen.
    Many Chinese people advise against using these converters above 32V - I wonder why ???
    Some people write that it works up to 40V, and others only up to 32V ???
    I thought it was only the fault of these 1000uF / 35V capacitors, but as you can see, probably not.
  • #98
    ArturAVS
    Moderator of HydePark/Cars
    Mine has been working for over a year with various loads (sometimes even as a battery charger) and nothing. No problems. The only thing I noticed was catching RF. . As a friend turned on the transmission in the hand towel for 2m (5W), the output voltage went to max. .
  • #99
    D¿yszla
    Level 42  
    Transformer, bridge and capacitors? Without any voltage control / equalization? How do you know that the input is 34V and it is always there? How do you know if 50V is not present when switching on and off (and this is when there is no load)?
  • damian1115
    Level 34  
    E8600 wrote:
    If someone has the opportunity, let him read what diodes they put there.

    The diodes are STPS 2045 CTC
    I just picked up this inverter, it came from China.
    I'm going to make myself something like an auxiliary regulated power supply. I want to use a 24V / 7.5A switching power supply for this. I am wondering whether to use the capacitor that my colleagues mentioned earlier between the power supply and the inverter, or is it necessary? I have a multiturn potentiometer, also Chinese, to regulate the voltage, but I will use 10k and 1k to regulate the current. What do you think about it?
    I also have a DSN-VC288 panel meter. I have a question about this gauge. What do you think about connecting with this meter in place of the measuring resistor, or measuring the current on it? Will then a receiver be needed to set the current, or will it be possible to set the current dry?
  • brofran
    Level 39  
    damian1115 wrote:
    I also have a DSN-VC288 panel meter. I have a question about this gauge. What do you think about connecting with this meter in place of the measuring resistor, or measuring the current on it? Will then a receiver be needed to set the current, or will it be possible to set the current dry?
    The DSN-VC288 meter is a ready-made component that you plug into the output in accordance with the instructions in the 1st post. You don't have to worry about anything.
  • damian1115
    Level 34  
    Some time ago I made a "simple laboratory power supply", in this power supply I used the above-mentioned DNS-VC288, it works exactly on the principle described here. To read the current setting, I have to connect the receiver, or just short-circuit + and -, then the current value is displayed to me. Here I wanted to do it so as to be able to set the current without connecting the receiver, because a short circuit is probably out of the question.
    Is it possible?
  • brofran
    Level 39  
    damian1115 wrote:
    Here I wanted to do it so that I could set the current without connecting the receiver
    To do this, you need to lead the current limiter potentiometer from the inverter to the front panel of the power supply and scale it. Then during a short circuit (zero value of the receiver resistance) the VC288 meter will show no more A than the set limit.
  • damian1115
    Level 34  
    Thank you "brofan" for giving a hint, but I have a request for you. Could you describe it to me in a way that is more understandable to me. I am an amateur, I enjoy electronics because I like it, but I am far from advanced in this field. Potentiometers, as I mentioned before, I am going to lead to the front plate of the power supply. For this I want to use a multi-turn potentiometer for voltage, and 10k and 1k for current. So that the regulation will be outside the housing. the value of the limit, without connecting the receiver beforehand.
    How to do it, how am I supposed to scale it? Could you describe it to me?
  • brofran
    Level 39  
    damian1115 wrote:
    How to approach it now so that the meter shows the current limit
    The meter will not show you the limit value, but a graduated 1k? potentiometer (the ICC one).
    You connect everything as in the instructions from 1 post. You lead out the potentiometers to the faceplate. You set the 1k? potentiometer to the extreme position (of the minimum current). If you do not know which position it is, then you connect a receiver and check if the current is lower than it should result from the resistance of the receiver (with a fixed voltage, the receiver should consume e.g. 2A, and the real current will be e.g. 0.5 A). Then you know the current limitation has worked. Then you close the output and then the current should also be this value (0.5 A). Now, with the output shorted, you turn the potentiometer to get 1 A. You mark this position on the scale. Next, when the output is closed, you turn the potentiometer so that the current is 2A and mark it on the scale. And so you keep repeating up to 8 A which is the maximum efficiency of the inverter.
  • damian1115
    Level 34  
    Thank you mate "brofran" for your comprehensive answer.
    I will mark these values on the potentiometer scale, as you wrote.
    I only have concerns if I accidentally release this system as I scale it on a short circuit. Here, colleagues wrote differently on this topic.
    I happened to burn a similar circuit, but in a slightly different way. I touched the multimeter probe to the output minus of the converter, with the heat sink of the MBR 20100 CT diode. Then the XL 4016 burned down, he got a puncture. I repaired the inverter, ordered a few of these systems and replaced the burned one, it works again.
    Therefore, now these my fears of damaging again. I can be sure I won't burn again what do you think?
  • brofran
    Level 39  
    damian1115 wrote:
    I can be sure I won't burn again what do you think?
    You can protect yourself by connecting a 12V / 55W car bulb in series to the output of the power supply (up to 3A).
  • Heavy R
    Level 10  
    Hello, you can power this converters from a transformer. half-board? (trafo from a Chinese rectifier).
    If so, should insert a filter capacitor.
  • ArturAVS
    Moderator of HydePark/Cars
    CMS wrote:
    What is a one-way transformer?

    A hypothetical transformer / converter that outputs a half sine wave :D
  • CMS
    Administrator of HydePark
    I guess it's more of a half-wave rectifier :)
  • zybex
    Helpful for users
    Heavy R wrote:
    Hello, you can power this converters from a transformer. half-board? (trafo from a Chinese rectifier).
    If so, should insert a filter capacitor.

    What's the problem to insert a bridge and, of course, a filter capacitor instead of a one-way rectifier?
  • Heavy R
    Level 10  
    Yes, it is a kaufland single-half rectifier, it gives 15-16V at the start and immediately gasses the electrolyte so I wanted to convert it.
    How to connect the bridge now, as there are 3 leads from the transformer. The second time to straighten it, there will be big losses on 6 LEDs.
  • ArturAVS
    Moderator of HydePark/Cars
    Heavy R wrote:
    How to connect the bridge now, as there are 3 leads from the transformer.

    Show it luck, because probably two diodes + an electrolytic capacitor are enough.
  • CMS
    Administrator of HydePark
    You connect the bridge to the "extreme" leads of the transformer. The "middle" one is a half tap.
  • brofran
    Level 39  
    Heavy R wrote:
    he gives 15-16V at the start and immediately gasses the electrolyte so I wanted to convert it.
    What do you want to use this charger for. What alternating voltages does the transformer give 2x how many Volts at the output? Should the transformer work with the XL4016 converter?
  • coperfild
    Level 35  
    Quote:
    Someone may have the module damaged by too high current? (I suspect it at least)
    Voltage regulation works, but current regulation does not (current flows even higher than the nominal maximum). What could be damaged?

    I have the same, I replaced the lm358, tl431, I checked the potentiometer and resistors, everything is working and there is no current regulation. Mine died while charging the battery from the tablet, the battery had a short circuit.
    Someone will suggest what else to measure.
  • zybex
    Helpful for users
    I will connect to the topic with the question, has anyone made a battery charger on it? I mean the battery around 45Ah (Corsa C). Will this inverter be able to handle it and can it be left unattended without any worries?