Re: proposed circuit for bicycle battery recharger



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
..



.