I have a bicycle that can produce 4V and wanted to know if I hook it up to a 12V battery, with it charge?
2007-02-24 11:19:55 · 6 answers · asked by Buddy 2 in Science & Mathematics ➔ Engineering
It's possible but not by connecting directly. If you connect the 4V source directly to a 12V battery, the battery will discharge rather than be charged up. You may even damage the 4V source if it is a cheap one which does not have reverse over-voltage protection.
You need a charge-pump circuit. Basically for your case you would need 4 large capacitors. Each charge pump cycle has two steps: first you connect the 4 capactors in parallel to and to the 4V source to charge them up to 4V; then, second, you alter the wirings to connect the 4 charged capacitors in series which makes 16V which is then connected to and charge the battery.
Can you think of a way to do the charge-pump swiching using the spinning of a bycicle wheels?
2007-02-24 11:37:18 · answer #1 · answered by Anonymous · 0⤊ 0⤋
If the 12 volt battery has any energy left in it, it will tend to make the generator run as a motor. If you want to charge the battery with a 4 volt source, then you need a voltage multiplier that will take the 4 volts and boost it to 12 volts, or more likely, about 16 volts. Current output will be quite low however. It would be more of a trickle charge than a full rate charge. No, I am not kidding, there are circuits available that will multiply a voltage. Such devices were used in television sets to boost the horizontal output up to the anode voltage needed to provide the needed voltage for the picture tube to operate properly.
While all of this is theoretically possible, save yourself a lot of time and frustration, go buy a regular battery charger.
2007-02-24 11:31:22 · answer #2 · answered by Anonymous · 1⤊ 0⤋
definitely there are 3 techniques which incorporate your present day charger: a million) use the 12 V placing for a quick volume of time; or 2) use the 8.4 v placing for an prolonged volume of time; or 3) biff the charger and use the excellent suited one. a million) Any voltage above the present voltage placing of the batteries will fee them, the better the voltage the better the enter present day. subsequently, the 12v placing is particularly a severe enter voltage, so the batteries will fee very promptly. 2) If the battery voltage is below 8.4, then the battery will fee. reckoning on the layout of the charger, the 8.4 v dc output must be "flat" or it ought to have a ripple. If there's a ripple, then it is going to intend it rather is obtainable for the charger to fee the batteries to a miles better voltage than the charger could enable, subsequently the choose for an prolonged volume of time to fee the battery. 3) via fact that neither charger looks the excellent suited one for the job, you're able to throw the two away and use one that has an output voltage of around 10 - 10.5 vdc.
2016-11-25 21:26:59 · answer #3 · answered by ? 4 · 0⤊ 0⤋
No this will not work. If the 12v battery is dead then perhaps you can charge it to 4v but nothing more, you really do need at least a 12v source.
2007-02-24 11:24:38 · answer #4 · answered by mr.answerman 6 · 1⤊ 0⤋
It'll charge to 4 V
2007-02-24 11:22:54 · answer #5 · answered by arbiter007 6 · 1⤊ 0⤋
no
just buy 12v solor charger for the battery there pretty cheep and work good
2007-02-24 11:29:36 · answer #6 · answered by twocenst 3 · 0⤊ 0⤋