Re: proposed circuit for bicycle battery recharger

Fred Bloggs wrote: 


Tom (at tomsweb.net) wrote:



                          4700uF
                            ||+
        .------------|---o--||----o-->|--o-----o-------------.
        |            |   |  ||    |      |     |             |
        |            -   |        |      |     |             |+
        |            ^   |        |      |     |            ---
       .-.           |   '-->|--. |      |     |+            -
      ( ~ )     GND|-o          | |      |    ---           --- 4 cell
dynamo '-'           |          | |      |    --- 4700uF     -  NiMH
2.5-5V  |            V   .-->|--|-'      |     |            --- (4.8V)
RMS     |            -   |      |        |     |             -
        |            |   |      |        |     |            ---
        |            |   |  ||+ |        |     |             -
        '------------|---o--||--o---->|--'     |             |
                            ||                 |             |
                          4700uF               |             |
                                              ===           ===
                                              GND           GND

created by Andy´s ASCII-Circuit v1.24.140803 Beta www.tech-chat.de

This doubler circuit I found at:
http://www.kwarc.org/bulletin/99-04/tech_corner.htm


What's the matter with the conventional full-wave doubler, not enough diode drops? :

             View in a fixed-width font such as Courier.
.
.
.
.
.
.      dynamo
.      2.5-5V
.      RMS
.       .-------+--o-->|--o---+---------------o-------------.
.       |       |             |               |             |+
.      .-.      |             |+              |            ---
.     ( ~ )     |            ---              |             -
.      '-'      |            --- 4700uF       |+           --- 4 cell
.       |       |             |              ---            -  NiMH
.       '---------------------+              --- 4700uF    --- (4.8V)
.               |             |+              |             -
.               |            ---              |            ---
.               |            --- 4700uF       |             -
.               |             |               |             |
.               +--o--|<--o---+---------------+-------------+
.                                             |
.                                             |
.                                            ===
.                                            GND
.




Please explain the purpose of the rightmost cap????
Then explain why we need ANY of the caps????

Depending on the load vs available charge current, there may
still be the problem of overcharging and the pedaling effort
to just overheat the batteries.

Then there's overdischarging...
mike

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