Fejemis battery control

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Introduction

The battery system is 24V, but split into 2x11.1V Lip batteries.

Each battery has a charger and a charge control board as shown in the schematic below.

Another board combines the two batteries and has a number of XT60 plugs for power distribution as shown below.

Charger board

Battery charge board: The battery is connected (with an XT60) at top-center called 'BAT' with the balancing cable at the pins just below. The charger is connected to the left (again XT60 and balance plug), The charge is disconnected using a relay, when not in use. The relay is activated with a small 6V supply from 230V mains (RELAY_6V). The battery meter is connected when power is on using Q3 and Q1. The AD3-CHARGE (lower-right) is for the u-processor to detect that we are charging.

Power distribution board

The power distribution board has 6 XT60 output plugs (left). The two battery charge boards are connected in the right-centre position. A fuse and Q4 transfer the battery voltage to the output plugs. The U1 block is a current sensor. The on-switch is in the lower-right corner. Q2 allows the processor to turn off the power.