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Registered Member #11591
Joined: Wed Mar 20 2013, 08:20PM
Location: UK
Posts: 556
a turns ratio of 6 is very, very low. A turns ratio of 1000 solves all your problems. Burden resistor of 10 ohms, 1 A maps to 10 mV, no nasty explodyness, negligible phase shift.
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1714
As Hen and Uspring pointed out, something in those Falstad animated simulations led Avi astray (no pun intended). How can we see the invisible details, like voltage source amplitude or transformer parameters?
If CT burden were a pair of antiparallel diodes, as mentioned above, then one could be replaced with the LED of an optoisolator. Then optical receiver speed becomes the challenge. Many fiber-coupled receivers work at many gigabits per second.
Those ACS732 hall-effect current sensors come with linear full-scale ranges up to +/- 75 amperes, and aren't damaged by out-of range current. As long as the RMS current (figured over a whole DRSSTC burst-to-burst interval) doesn't overheat the device. It was a surprise to see "1 MHz" devices spec'd with 220 pF capacitance on the output! Risetime and prop delay: 0.7 and 0.14 microseconds typical, unspecified max and min.
Let's wait and see if anyone takes up my challenge about effect of 1 nanohenry on a 1 milliohm traditional current shunt or ACS732 primary-side leadframe.
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Phase accurate primary current sensing
Or just use a smaller resistance.
Then optical receiver speed becomes the challenge. Many fiber-coupled receivers work at many gigabits per second.