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BattMan II: Build a Computer Controlled Battery Manager

2016-05-11 11:31  
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BattMan II: Build a Computer Controlled Battery Manager
BattMan II consists of five subsystems: power supply, current control, battery connection, voltage measurement, and logic power. The power supply I used is a commercial off-the-shelf model that can supply 18 Volts at 2.2 Amps. I purchased mine at a surplus store. Any similar power supply will do, so long as it produces 18 to 20 Volts, and enough current for the maximum charge rate you want to be able to use. Points labeled V+ in the schematic are connected to the positive terminal of the power supply. CMOS buffers Z2a through Z2d together with resistors R26 through R34 form an R-2R ladder digital-to-analog converter. R34 is used to adjust the output voltage range so that it spans 0 to 0.2 Volts (which can be measured at test point TP2). The input to the converter is taken from the four low-order data bits (D0 to D3) of the parallel printer port that BattMan is connected to.