On PME it is not a lot of use, I agree, but oranges are not the only fruit, and many places are not TNC-s.
The design I have seen somewhere showed a six diode bridge, (like this 3 phase example here ) albeit with series resistance to two of the lines - so the 3 wires are not connected to each other, except by back to back diodes, but voltage between any two would create some DC to keep the circuits alive. In normal use the diodes on the FE path are not needed, as they do the same as the ones on neutral, and the circuit collapses to a normal 4 diode bridge here.
On PME it is not a lot of use, I agree, but oranges are not the only fruit, and many places are not TNC-s.
The design I have seen somewhere showed a six diode bridge, (like this 3 phase example here ) albeit with series resistance to two of the lines - so the 3 wires are not connected to each other, except by back to back diodes, but voltage between any two would create some DC to keep the circuits alive. In normal use the diodes on the FE path are not needed, as they do the same as the ones on neutral, and the circuit collapses to a normal 4 diode bridge here.
