There is two pin in the power input port of 7sj62 siemens numerical overcurrent relay. The two pin of the port can be energized by both 110 V DC and 230 V ac. There is electronics product in the relay, so a dc to dc converter must be there. My question is how can the power supply differentiate wheather a DC or AC supply is given in the same port and take necessary action accordingly. (Such as if 230 VAC is given how can it realise and use a rectifier and then DC to DC converter and when 110av DC is given how can it realise and skip the rectifier and directly fed to dc to dc converter?)
Taking ground as reference for 220 AC and Negative for DC supply via Peak detector, could refer my paper’s…….
It can use a rectifier for both AC voltages as well as for DC voltages like this:
AC voltage.... rectifier.....DC voltage
DC voltage....rectifier......DC voltage
But, it is a complicated device, which has a microcontroller. I suppose it measures the input voltage and computes the mean value. if it is zero, the input voltage is AC. If it is a positive value, it is a DC voltage
Thank You @Bhupendra Desai. Please can you give your research title?
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