I always pondered about modeling a thermal breaker or fuse using a single RC circuit like this and using a low-pass filter of current flow through a shunt and a comparater controlling a pass transistor to make an active fuse, though such chips already exist of course
Better than being electrified as I was as a kid🤣. You may be surprised, but many engineers think that a 1A fuse will blow at a little above 1A or that it can protect a MOSFET against overcurrent.
Considering the case of open loop voltage mode PWM smps..the inverse...i.e. I (current) ×√time (in secs) (1000*1000u secs) can be implemented similarly for a " pulse by pulse" protection thereby emulating the actual I^2t function..... Please share your comments on this..
@@sambenyaakov existing V. mode pwm usually have "peak" C.L. as a protection feature..this is on a pulse by pulse basis.....in an over current fault situation, where over an extended period of time..if this is active..the I^2t of the device or load may be still exceeded, eventually leading to some failure... therefore my reasoning is if such similar protection can be implemented in pwm control , with I(avg/rms)*√t.. , since I is in A/mA and t(on) is in uSecs. such may be easily done with transistor/opamp circuits..
