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AVR451
3 Main hardware blocks
The blocks of the BC100 used for battery charging are described below. For more
details on parts of the design not described below, please refer to the schematics.
3.1 Buck converters
The buck converters are used to generate a given output voltage that can be used to
e.g. charge batteries (or even control the speed of a DC motor). Since the choice of
components for the buck converter determines the maximum output voltage and
current three different buck-converters are included in the BC100 design. This can
give the application designer an idea of what kind of PCB size that should be
expected depending on the desired output voltage and current.
At set of jumpers are used to select which of the three buck converter circuits that are
used (refer to jumper section for jumper settings): these connect the board supply to
one of the buck converter circuits, connect the ATtiny PWM output to the switching
FET, and the output from the buck converters to the battery (through shunt and
relays). Please refer to Figure 3-1 to see the buck converter designs.
Figure 3-1. The three buck converters of the BC100 (section of the BC100 schematics).
3
8088A-AVR-09/07
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