Connect with us

12 / 24 or 48v to 400V Boost Converter to charge electric car from solar panels

Discussion in 'Power Electronics' started by tantric, Mar 8, 2020.

Scroll to continue with content
  1. tantric

    tantric

    7
    0
    Mar 8, 2020
    hi guys, goes as follows...

    i have 4 x 150watt solar panels (600watts) each of 16v and 8,41 Ampere max (those at best conditions, but i can expect 400/500watts)

    and i need a circuit (at least 90% efficiency) to charge the 16kW battery of my electric car with the solar panels,
    the battery is 330v @ 50Ah with 400v charging voltage, i only need 400v @ 1Amp or 1.5 Amp at the output (400 / 500 Watt)
    (50Ah / 1A = 50 Hours needed to charge from completely empty to full)

    i found this schematic that will boost 12v to 400v, but the IRF450 only can handle with 15Amps,
    so im thinking in using 2 sets of 2 panels in series, and those 2 sets then connected in parallel to have around 24/32v 15Ampere input

    what modification do i need to do to this circuit so it can provide stable 400 v at the output,
    independent of the load and independent of input voltage (since the panels vary voltage from 12 to 16 depending on the current amps demand)

    i suppose i need a voltage divider from the output diode to the 555 chip, but not sure where to connect i

    [​IMG]
     
  2. Bluejets

    Bluejets

    3,764
    781
    Oct 5, 2014
    No problem paralleling mosfets as they do not have the same parallelling problems as transistors which need ballast resistors.
    So to summarise, simply add more mosfets in parallel.
     
  3. tantric

    tantric

    7
    0
    Mar 8, 2020
    cool much grateful bro

    and about my question? what modification do i need to do to this circuit so it can provide stable 400 v at the output,
    independent of the load and independent of input voltage (since the panels vary voltage from 12 to 16 depending on the current amps demand) , i suppose i need a voltage divider from the output diode to the 555 chip, but not sure where to connect i
     
  4. Bluejets

    Bluejets

    3,764
    781
    Oct 5, 2014
    Not in to designing boost converters.
    Tend to leave that to the manufacturers.
    Several reasons including cost and time.
     
  5. Hunter64

    Hunter64

    27
    10
    Nov 20, 2018
    Using a timer-ic for a voltage-converter like this is waiting for problems to happen. Please, search for a serious power-converter and read some datasheets and application notes before making smoke and sparks.
     
  6. tantric

    tantric

    7
    0
    Mar 8, 2020
    okey, will look for another solution, much grateful
     
  7. WHONOES

    WHONOES

    774
    168
    May 20, 2017
    If you are going to have a play with this idea, I would transformer couple the output .
    I have used the 555 for similar circuits and it works quite well. Its control pin can be used to provide feedback to control the O/P volts by altering the PWM mark space.
     
  8. tantric

    tantric

    7
    0
    Mar 8, 2020
    COOL, can you please provide a schematic brother? king regards
     
  9. WHONOES

    WHONOES

    774
    168
    May 20, 2017
    Hi. Sorry about the short delay. I had to rummage through a large number of simulations to find the attached circuit for an 800V generator showing the basics.
     

    Attached Files:

  10. tantric

    tantric

    7
    0
    Mar 8, 2020
    i just need 400volts output... can you give me more specifications on the transformer?
     
  11. tantric

    tantric

    7
    0
    Mar 8, 2020
    what modification i have to do on this circuit to output only 400vols?
     
  12. Alec_t

    Alec_t

    2,757
    733
    Jul 7, 2015
    What type of battery? Lead-acid, lithium, ......? Batteries generally need a type-dependent specific charging profile to charge them safely and efficiently. Just applying a fixed 400V to them is not ideal and could be dangerous.
     
  13. tantric

    tantric

    7
    0
    Mar 8, 2020
    lithium battery's... they already have built in protection circuit for over voltage... since they can be charged with 400 v half hour fast charge
     
  14. WHONOES

    WHONOES

    774
    168
    May 20, 2017
    Alec T is correct. You will need to profile the charge regime. Just pumping current into a set of batteries is not safe. But, presumably if you are as you say, charging batteries in your car, the charging circuits contained therein will take care of the charge profile.
    Designing a switch mode transformer is no mean feat. The one in my simulation is quite small and was not intended to produce a lot of current. I suggest you have a good read of the document in the link below and go from there.
    You could conceivably use the buck converter system proposed in your first post and apply the control functions shown in my simulation but, this would not provide any isolation which is not a good plan.
    You can alter the output voltage by setting the loop gain. Gain depends on the ratio of R7 and R6 multiplied by the value of Zener D7.
    Divide the required output voltage by the value of D7, in this instance 4.7V and add 1 to the result now, multiply R6 by the result which gives you the value for R7. In the likelihood of the result not falling on a standard fixed value, a potentiometer could be used to adjust the output to required value.
    You must also bear in mind that the voltage on the primary of the transformer will be much higher when the switching transistor is off.

    https://www.ti.com/lit/ml/slup126/slup126.pdf
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-