Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
I was basically referring to the usual technique in today's low and medium power boost (e. g. PFC) and flyback (e. g. isolating off-mains) SMPS. As a matter of fact, they mainly use current sense resistors.
Obviously other techniques are available as well. Current sensing by MOS Rds,on is an interesting alternative particularly for low voltage synchronous buck regulators. It has to consider parameter variations and Rds,on TC, however.
Hall sensors are good for power electronics beyond several 10 A.
I don't yet understand, how a current mirror could have a meaningful application in this regard. Can anyone suggest a principle circuit?
O.K., I see. I regarded this technique as resistor sensing as well.
High-side current sensing is mainly used with buck converters. I assumed (in silence), that the boost switch current shall be sensed, so there's no need for a current-mirror level-converter. High-side current sensing may be needed however, if the total input current is the interesting measurement, e. g. for a PFC boost converter.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
