In another post, I have been trying to apply a voltage bias to one of two inputs fed into active bridge rectifiers, and into a comparator and have thought of a solution.
If I had a split power supply (as per screenshot), I could feed the first circuit using the 6v supply and the other via the 8v supply, which would give me the necessary bias.
I have created a sim and it works fine.
However, I havn't a clue how to build the split supply.
I have a DC 9v supply, which I wish to split as 0v - 2v - 8v (the 2v will be used as a ground for part A circuit, whilst true ground will serve as ground for Part B.
I tried resistors but it didnt work well and would prefer a regulated circuit.
Part A draws about 60mA whilst part B draws 10mA
But with this suggestion, I would be running one part on 6v and the other part on 8v which would not give me the 2v ground differential (ie I need the ground on one part of the circuit to be 2v higher than the other part of the circuit)
Ok, here it is. As you will see the ground on U3 and U4 is higher than that of U1 and U2, which enables me to maintain a bias voltage at 'Solar Out'.
The 2 inputs (V2 & V5) are Current Transformers, and the circuit is designed to switch on a water heater IF solar generated power exceeds what is being consumed.