This is a regulator for a 6V/3W bicycle hub generator system. The purpose is to manage the powering of bicycle lights from the hub generator and from rechargeable batteries, to charge the batteries using excess power from the generator, and to provide intelligent charging of the batteries from an AC adapter, when needed.
The switch has three positions: charge-off-light. In the charge position, the bicycle dynamo charges five AA NiMH batteries if those are drained. If the batteries are reasonably full, then the circuit draws virtually no power. In the light position, if the dynamo’s average voltage is below some threshold value, then the bicycle lamps are fed by the batteries aided by the rectified dynamo If the dynamo voltage is high, the lamps are fed directly by AC from the dynamo and the dynamo excess power is used to recharge batteries. The direct use of AC maximizes efficiency. Additional circuitry is provided for an intelligent charging of the batteries from an outlet using a 12V AC or DC adapter. Practice shows that that additional circuitry may be redundant. A flickering green LED indicates the activity of the dynamo in the charge mode and the fact that the light is fed by AC in the charge mode. A red LED indicates the fast charge state when the charging is done from an outlet.
Source: http://www.nscl.msu.edu/~daniel/sreg.htm
Related Links
See other circuit on power supply regulator
See other circuit on Battery Backup Supply
See other circuit on bicycle dynamo circuit
6V backup battery power supply regulator with IC 7805
Battery Backup Supply with IC 7812 and 7805
6V to 12V Converter by transistor
SG3525 DC Converter 12V to +35V,-35V
This entry was posted on Sunday, September 23rd, 2007 at 11:10 pm and is filed under Automotive, Power supply.
