LED & charge plug
I also brought out the pins required for charging. I adapted the charger connection to fit this. Now my Seguino can be quickly charged when needed.
Below you can see the LED display used for heartbeat and also battery status.
Here you can see how the cover box for the seguino has been adapted to include a hinge and simple locking mechanism to allow simple opening and closing of the cover box. This makes it much easier to make small changes to the Seguino as you go.
Here you can see the modifications recommended by Gerold – Elektronik built in to the driver circuit.
- Change C1, C2 and C3 from 470uF to very good 1000uF Elkos. This absorbes the extreme ripple currents better and eliminates strange shutdowns.
For each RC element (R 0.47 and 100nF in series) on each H-bridge branch. Very close and short upper transistor from drain to source lower transistor. (Drain to source T5 T6, T7 drain to source T8, drain to source T1 T2 T3 drain to source T4). It’s always from 24V to ground, but the extreme proximity of the transistors is critical, otherwise they are useless.
Install an over-voltage protection diode between drain and source (SMCJ33A MOSFETs) cathode to drain. The MOSFETs only tolerate a reverse voltage of 55V. The diodes protects against higher spikes.
On the motor driver print change R5 from 6k8 to 4k7. This increases the voltage of the MOSFET driver from 12V to 15V. This speeds up the transistor swiching and reduces losses.