Help with basic electronics theory

Discussion in 'General Electronics Chat' started by micktosin, Apr 7, 2013.

  1. micktosin

    Thread Starter New Member

    Mar 20, 2012
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    I have Dc-dc Boost converter designed to step up (12-24Volts) to 28.8Volts(10Amps). The converter is currently working perfectly(stepping up 24V-28.8voltage) with a dc power supply, however this Dc converter after completion, will be fed up to a max input power of 2400Watt(24V&100Amps) from a Dc generator. My question is, can the input power be pulsed width modulated from 2.4KW to 288Watt(28.8Volts &10Amps), by just reducing the duty cycle to the switching transistors? Because otherwise, i might be forced to buy a 2.4Kw rated load resistor, of which I'll rather not.

    Second question; Is there a way i can locked the output to 28.8Volts regardless of the input Voltage(12-24Volts). Because currently i am using a 555 timer as my pwm, and just like other Chip they can't take high input feedback available from the output of the converter.
     
    Last edited: Apr 13, 2013
  2. Metalmann

    Active Member

    Dec 8, 2012
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    Not trying to hijack, but what Program did you use for that circuit?:confused:

    Looks like something I need....:cool:
     
  3. kubeek

    AAC Fanatic!

    Sep 20, 2005
    4,670
    804
    I am not quite sure where you´re are loosing 2000W, but I think that using falstad simulator for anything more complex than a battery - LED - resistor circuit is a bad idea. Download LTspice and see what results you actually get.
    Anyway the output current will mainly depend on what is the dutycycle of the switch control voltage.
     
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  4. micktosin

    Thread Starter New Member

    Mar 20, 2012
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    Falstad simulation, not accurate tho.
     
  5. micktosin

    Thread Starter New Member

    Mar 20, 2012
    19
    0
    Hi there, (Please find attached diagram)
    To rephrase my question.
    I have Dc-dc Boost converter designed to step up (12-24Volts) to 28.8Volts(10Amps). The converter is currently working perfectly(stepping up 24V-28.8voltage) with a dc power supply, however this Dc converter after completion, will be fed up to a max input power of 2400Watt(24V&100Amps) from a Dc generator. My question is, can the input power be pulsed width modulated from 2.4KW to 288Watt(28.8Volts &10Amps), by just reducing the duty cycle to the switching transistors? Because otherwise, i might be forced to buy a 2.4Kw rated load resistor, of which I'll rather not.

    Second question; Is there a way i can locked the output to 28.8Volts regardless of the input Voltage(12-24Volts). Because currently i am using a 555 timer as my pwm, and just like other Chip they can't take high input feedback available from the output of the converter.
     
  6. kubeek

    AAC Fanatic!

    Sep 20, 2005
    4,670
    804
    No, not in this configuration. Each of the mosfets will get 25% duty cycle regardless of the pwm frequency.
    You would need to change the driving circuit to achieve any pwm modulation.
    ..And the counter is connected wrong.
     
    Last edited: Apr 13, 2013
  7. kubeek

    AAC Fanatic!

    Sep 20, 2005
    4,670
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  8. micktosin

    Thread Starter New Member

    Mar 20, 2012
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    Massive thanks for that link, that was helpful. However, i am lost from section 6.1 -6.3 onwards(Implementation wise). Firstly, please can you suggest how to integrate the following into my circuit.

    1. Simplified error amplifier section to get a constant output power
    2. Analog control section to regulate the circuit output voltage.

    Another question, hence i'm using a switch mode Dc converter, can a manipulation of the PWM duty cycle, reduce the output power to 288Watts from 2.4KW (Through averaging).
     
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