Circuits for photovoltaic applications

A photovoltaic array circuit comprising:

• a first electrical transmission safety system for connection of a first photovoltaic cell to a load, the first electrical transmission safety system comprising:
• a first connection from the first photovoltaic cell to the load, the first connection comprising a positive terminal;
• a first solid state switch electrically connected between the first photovoltaic cell and the positive terminal;
• and
• a first switch-control isolation block comprising a first optocoupler, the first optocoupler providing electrical isolation from the first photovoltaic cell for generating a first isolated switch-control signal in response to a switch-control input signal, the first switch-control isolation block connected to provide the first isolated switch-control signal to the first solid state switch to thereby control an ON or OFF conduction state of the first solid state switch and corresponding current flow between the first photovoltaic cell and the load through the positive terminal;
• a second electrical transmission safety system for connection of a second photovoltaic cell to the load, the second electrical transmission safety system comprising:
• a second connection from the second photovoltaic cell to the load, the second connection comprising a negative terminal;
• a second solid state switch electrically connected between the second photovoltaic cell and the negative terminal;
• and
• a second switch-control isolation block comprising a second optocoupler, the second optocoupler providing electrical isolation from the second photovoltaic cell for generating a second isolated switch-control signal in response to the switch-control input signal, the second switch-control isolation block connected to provide the second isolated switch-control signal to the second solid state switch to thereby control an ON or OFF conduction state of the second solid state switch and corresponding current flow between the second photovoltaic cell and the load through the negative terminal;
• the first photovoltaic cell connected to output a first DC potential between a first positive node connected to the first solid state switch on a side of the first solid state switch opposite the positive terminal and a first negative node;
• the second photovoltaic cell connected to output a second DC potential between a second negative node connected to the second solid state switch on a side of the second solid state switch opposite the negative terminal and a second positive node;
• and
• the first negative node electrically connected to the second positive node.