Help on building a more sophisicated Dc to Dc boost converter

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System
System Posts: 2,511 admin
in Solar Beginners Corner #1
Hi all,

I wanted to build a dc-to-dc boost converter that can boost up the output voltage to around 10 times the input voltage. But currently my design can only boost up the voltage to only 4 times the input voltage and the input current of my converter is quite high which is not desired. Could someone kindly guide me or better recommendation to realise my design. My current specification are as follow:

1) IGBTs rated at 15V ( As switches)

2) I have design a Gate signal circuitry using the electronic chips below:

=>>NE555 Chip: PWM signal pulses are generated from the NE555 timer. The generated pulses are then input to the TLP250 chip.

=>>TLP250: It has the capability to boost the voltage up to 15V and also function as an opto-isolatior to provide signal isolation and break up the electrical contact.

==>NME0515SC:It has the capability to provide power isolation and also voltage of 5V and 15V so as power up the other IC chips in the circuitry.

=>>IR2111: As the output of TLP250 complements the signal pulses generated by NE555, the use of IR2111 chips produces the required PWM signal pulses at 15V.

As such, the signal pulses produced can be used as input for the IGBT.

Please Help...Thank you very much!
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  • mike95490
    mike95490 Solar Expert Posts: 9,583 ✭✭✭✭✭
    #2
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    Re: Help on building a more sophisicated Dc to Dc boost converter

    I usually just buy my DC-DC converters. So much to consider and so many failure modes that end in fire. What's your input voltage, and what's your desired output voltage - and how many watts ? Why not use a DC-DC IC and just add the external caps and driver?
    Powerfab top of pole PV mount | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
    || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
    || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

    solar: http://tinyurl.com/LMR-Solar
    gen: http://tinyurl.com/LMR-Lister ,

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  • System2
    System2 Posts: 6,290 admin
    #3
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    Re: Help on building a more sophisicated Dc to Dc boost converter

    My Vin=12Vdc and the desired Vout=230Vdc.Please help.Really appreciate!
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  • mike95490
    mike95490 Solar Expert Posts: 9,583 ✭✭✭✭✭
    #4
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    Re: Help on building a more sophisicated Dc to Dc boost converter
    Solarmanics wrote: »
    My Vin=12Vdc and the desired Vout=230Vdc.Please help.Really appreciate!


    How many watts ? Gotta know that too.
    Powerfab top of pole PV mount | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
    || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
    || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

    solar: http://tinyurl.com/LMR-Solar
    gen: http://tinyurl.com/LMR-Lister ,

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  • mike95490
    mike95490 Solar Expert Posts: 9,583 ✭✭✭✭✭
    #5
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    Re: Help on building a more sophisicated Dc to Dc boost converter

    Regardless of the watts, this would only be low power. After bumping up the power, either by boost transformer, or capacitor stack, you are looking at miliamps, not amps. The output filter caps will be fairly massive at 300V 100uF.
    vendors:
    http://www.picoelectronics.com/dcdclow/pe62_63.htm 12A200 or 12A250 @ $85
    http://www.acopian.com
    http://www.lambdapower.com/
    Powerfab top of pole PV mount | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
    || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
    || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

    solar: http://tinyurl.com/LMR-Solar
    gen: http://tinyurl.com/LMR-Lister ,

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  • Roderick
    Roderick Solar Expert Posts: 253 ✭✭
    #6
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    Re: Help on building a more sophisicated Dc to Dc boost converter

    I have some small experience with switching power supplies. What you're looking for is almost a 20:1 boost ratio, so you're going to need a transformer in there.

    Possibly your best route would be to get one of those cheap car inverters (maybe one designed for Europe - 220V), open it up, and try to tune the voltage down for your needs. Then rectify the AC to DC.

    I have a concept design for a high voltage solar regulator, which you are welcome to look at, if you like. I make no claims as to performance or safety, though. It wouldn't work directly for what you need, as the intended input voltage is 100-300 volts or so. Best way to get in touch is to email me at roderick.young @ lycos.com, as I don't check the forum very regularly, anymore.
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