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Solar Boost Charger Circuit with LED Driver Dimmer

Last Updated on May 24, 2022 by Swagatam 6 Comments

caution electricity can be dangerous

The article explains a simple solar boost charger with LED driver circuit which also includes a single push dimmable feature. The idea was requested by Mr. Ashutosh.

Technical Specifications

Hi swagatam,

Myself Ashutosh. I m very new to ur website, n i ll say u r superb, u r doing one of the best thing by helping hobbyists. Thank you very much. I want an LED driver cum charger circuit for our project. i know u already have thousands of request pending and at the same time u might be working on different circuits, even though i want to ask for it, my circuit details are as below-

1. It's an LED lamp
2. Having 3volt (0.5watt) of solar panel for charging the battery.
3. Have to charge 3.6 volt battery from the solar panel (for this may be some boost ic is required ).
4. Regarding switching---> have one switch---> when all the connection are there the LED should be in off mode---> after 1st press it should glow in full brightness i mean 100% duty cycle----> 2nd time when i press 2nd time the switch the LEDs brightness should decreased by 40-50%---> when i press the switch 3rd time the LED should get more dimmed(say the brightness should decreased by 70-80%)----> and when i press the switch 4th time the LED should get off.
5. Circuit should be very compact(made up of very few components) and no use of microcontroller plz as, i dnt have that much idea about the microcontroller.
6. Also suggest the best LED for brightness whether it ll be an SMD LED and it's specification.

it won't be so difficult for u sir. i m bookmarking you this page for your reply, as i know from ur site, ur best thing is u used to reply almost everyone  keep doing it. A positive reply is expected from you. Thank you very much.

The Design

  • When an input is applied, the transistor instantly goes into an oscillating mode inducing a relatively stepped up voltage across the connected battery.
  • The process starts charging the battery and depending upon the position of the IC 4017 output illuminates the connected LED with a certain intensity.
  • The IC 4017 operates in three modes as requested above.
  • The modes can be selected by pressing the given button momentarily.
  • The above toggling sequences the output from the pin2 to pin7 in steps producing different glow intensities on the LED.
  • At the first pin out pin#3 (not shown) the LED shuts down completely as it's not associated with the switching network in anyway.

How to build the TR1 transformer?

The circuit is a simple joule thief circuit which is used as a boost charger or a step up charger. To get all the details of the TR1 transformer you an refer to the first design from the following article:

Joule thief Circuit

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About Swagatam

I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer. I am also the founder of the website: https://www.homemade-circuits.com/, where I love sharing my innovative circuit ideas and tutorials.
If you have any circuit related query, you may interact through comments, I'll be most happy to help!

Reader Interactions

Comments

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  1. Nelio Abreu says

    November 7, 2020

    Hi Swag,

    What’s the value and type of the capacitor?
    Best Regards.
    Nelio Abreu

    Reply
    • Swagatam says

      November 9, 2020

      Hi Nelio, capacitor value can be 1uF/25V

      Reply
  2. Bibin Edmond says

    August 28, 2013

    oh….! ok.. thanx swagatam.. !

    Reply
  3. Swagatam says

    August 28, 2013

    Hi Edmond,

    It's for enabling the switching only after at least 1V passes through push button as it's pressed, so that the IC responds only to legit pushes and not accidental leakages.

    Reply
  4. Bibin Edmond says

    August 27, 2013

    Hi swagatam,

    what's the use of two 1N4148 diodes on the circuit.. ?

    Reply
  5. Swagatam says

    August 6, 2013

    You are welcome Ashutosh,

    TR1 is wound over a toroid type ferrite core with 20:20 turns of any thin super enameled copper wire.

    The switch is an ordinary push-to-ON type of switch or simply a push button which should switch ON only momentarily when pressed and disconnect when released.

    The boost circuit is explained here more elaborately:

    https://www.homemade-circuits.com/2012/10/1-watt-led-driver-using-joule-thief.html

    Reply

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