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Power & Energy
Forum Raising the voltage to use a photocell
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Forum Thread Details
  • State Suggested Answer
  • Replies 35 replies
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  • solar-powered
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Related

Raising the voltage to use a photocell

Former Member
Former Member over 11 years ago

Anyone know how can i raising the voltage of a photocell?, from 0.5 volts to 5 volts, the photocell give me 0.5 volts and 9 amp, the problem is that if i use operational amplifier, i don't have the power to energize a small engine, i appreciate any information that  could be usefull or component that resist the power.image

¿Alguien sabe como puedo utilizar esta celda solar?, entrega 0.5 v y 9 amp, por ende la potencia es de 4.5 Watts, necesito subir el voltaje a 5 V aunque se reduzca la corriente, pero los diseños con operacionales no me resultan funcionales ya que tendria que darme alrededor de medio amper, y no resisten la corriente, ¿tienen alguna idea de como puedo hacerlo?

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  • Former Member
    0 Former Member over 11 years ago

    Hola si  he entendido bien la pregunta necesitas tener 5  voltios y la celda solar te da 0.5v tendrías de usar 10 celdas para conseguir el voltaje y los watios serán los que te da una única celda.

     

    también puedes subir el voltaje con unos diodos y unos condensadores se les llaman bomba que no deja de ser un multiplicador de voltaje pero no tendrás muchos watios

    creo que tengo un pequeño esquema tendré de buscarlo

    Saludos

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  • johnbeetem
    0 johnbeetem over 11 years ago

    I think what you want to look for is a boost-mode switching regulator also known as a step-up DC-to-DC converter.  They use an external inductor or transformer to boost a small input voltage.  For example, here's a Linear Technology LTC3105 which takes input from 0.25 to 5.0V and produces 1.5V to 5.25V.  However, this particular part doesn't produce much current with a 0.5V input, and its efficiency at that input voltage is poor, so I'm showing this as the kind of part to look for.  TI and Maxim also offer these kinds of parts.

     

    The Linear Tech page has some articles on solar energy harvesting showing what you can expect from solar cells.

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  • Former Member
    0 Former Member over 11 years ago in reply to Former Member

    Gracias Gabriel por la respuesta, así es encontré celas solares, solo que entregan poco voltaje y bastante corriente, por lo que ocupo aumentar el voltaje, se que se disminuira la corriente, pero  si logro hacer que quede en 5 v con al corriente en proporción sería bastante útil y de las celdas más eficientes que eh visto.Te agradecería si tienes el diagrama con capacitores y diodos para ver si puede funcionar, de antemano gracias.

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  • Former Member
    0 Former Member over 11 years ago in reply to johnbeetem

    Thanks John i never hear about that divice, i hope i can get one here in mexico,i'm visiting de web site to check the logistic sending for a few devices.

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  • jw0752
    0 jw0752 over 11 years ago in reply to Former Member

    Hola Jose'

    El circuito para aumentar el voltaje con diodos y condensores solo funciona con corrient de AC asi que no funcionara con celda solar.

    John

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  • D_Hersey
    0 D_Hersey over 11 years ago

    Why not just stack a few of the photocells?

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  • Former Member
    0 Former Member over 11 years ago in reply to jw0752

    Gracias por la aclaración, si me imagine ya que los condensadores en DC no se cargan y se descargan, solo que estuvieran en paralelo funcionan como filtros.

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  • Former Member
    0 Former Member over 11 years ago in reply to D_Hersey

    I need to used only one or two cell, because we don't have a lot of space to mounting, and for not raise de production cost,if i stack a few photocell i'll need ten to have five volts.But thanks for the opinion.

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  • D_Hersey
    0 D_Hersey over 11 years ago

    It is going to be very difficult to power an SMPS from 0.5V.  One problem is that the 'back of the envelope' drop across a typical power switch is about 1V.  The lowest Vgs-th, the potential needed to switch a practical mosfet, is around a V as well.

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  • Former Member
    0 Former Member over 11 years ago

    hola estoy buscando el esquemático que te comente y no lo localizo mirare en otro ordenador para ver si esta allá.

    estuve haciendo un proyecto en corriente continua y necesitaba subir el voltaje y lo probé y funciono correctamente con 5 v conseguí 15v para conseguir una fuente simétrica de una batería de 24 v para el proyecto también provee otro prototipo con un 555 y funciono con mas 12v y menos 12v. cuando lo encuentre te lo paso

    saludos

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