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2 votes
1 answer
172 views

How to sense a varying current and voltage without affecting the load

I've been asked to build a circuit to switch a constant power (varying current & voltage) supply between two loads, for a research experiment the customer is carrying out. The loads are unknown ...
Joe Mills's user avatar
1 vote
1 answer
100 views

Choosing an adequate op-amp for shunt resistor sensing in SMPS applications

I would like to get some industry experts / design engineers opinion about potential methods to improve the proposed shunt resistor current sensing method below. The intention is to improve this ...
rbe's user avatar
  • 45
0 votes
1 answer
114 views

Power outage detection to kickstart a safe shutdown and data retention process

I plan a system that operates on a 5v rail. The power is supplied from an outside DC source. The 5 V powers an RPI CM4 and other components that are controlled by it. The whole system requires up to 5 ...
metsik's user avatar
  • 191
0 votes
1 answer
976 views

high side vs low side current sensing in isolated bench power supplies, does it matter?

I'm trying to make a couple of mains isolated, transformer based, bench power supplies. Considering that the current sense resistor will be in the PSU box and external loads will not have access to ...
Indraneel's user avatar
  • 2,197
0 votes
2 answers
314 views

Sensing presence of 220 Vac for MCU

I'd like to use an HCPL3700(M) (datasheet) to sense if a 220 Vac mains is present. In my application, the device needs to raise an alarm if the mains voltage is lost. Backup power will be provided by ...
Michael Larsen's user avatar