Bicycle Dynamo Usb Charger Circuit

I couldn t find dynamo powered usb charger so i decided to try and make one.

Bicycle dynamo usb charger circuit. This circuit has been developed to add a usb charging port to a bicycle for charging a mobile phone. I used what i could find and cobbled it together based on information from instructable and. Rx 0 6 charging current. Interestingly this light also has a charger priority mode which will provide the minimum brightness to the leds and will send the rest of the power to the usb plug.

But they assume the person making the charger knows how to read a circuit diagram. If you re like me then this blog post is for you. I tried to build the usb charger very professionell and waterproof so that it will look great on my bicycle. How to calculate current limit for this bicycle dynamo battery charger circuit.

For off road use such as 24 hour mountain bike racing the use revo is a neat solution that fastens to the handlebars and. Often just one person are designing. I ve looking for a way to charge my electronics while i excercise on my bike. The third dynamo usb charger from sinewave is an led light with 750 lumens output and an integrated switch for charging.

I cannot understand a circuit diagram. 2 charging 1 2 v ni cd cells for science projects the second. The next idea below explains how to simply charge ni cd cells quickly using a dynamo device. Very small companies ie.

However hub dynamos don t produce a regulated 5v voltage to charge my devices over usb so i created a simply circuit that will transform the unregulated ac voltage from the dynamo to regulated dc 5v. The ultracapacitor stores energy to continuously charge the usb device even while the bike is not in motion. There is a wide array of dynamo usb chargers available 24 of em in fact and while most do an adequate job of keeping your electronics charged at high speeds there is only a select few which can provide a decent charge at touring speeds dynamo usb charger technology is actually improving at an incredibly fast rate. The beacon uses the same internals as the revolution and reactor so you can expect 2 5w at 17km h.

The circuit uses few components which help in keeping the size weight and cost of the unit down. The idea came from multiple sources including mr. Rx is the current control resistor which must be selected as per the charging current specifications by using the following formula. In this post i describe how i made a diy bicycle dynamo usb charger for smartphones and battery packs.

This circuit reduces the 6 volts from the motor to 2 5 volts. We use hub dynamos systems all the time and on all kinds of bikes. Lights and hubs and usb charging oh my. There are too many good lights out there for us to list on our little website but we mostly use busch müller as they have proven themselves well made and reliable.

This allows the motor to charge the boostcap 140 f which in turn supplies power to the mintyboost circuitry.