I2t. What? Why? When?: The electric fuse case

Рет қаралды 4,078

5 ай бұрын

Пікірлер: 20

@Chris_Grossman 5 ай бұрын

Thank you for the theory behind fuses. I have never looked into this. Your talk has inspired me to download and read the Kaufmann paper.

@sambenyaakov 5 ай бұрын

Thanks for sharing. The paper is old but still an eye opener.

@electronichome1153 5 ай бұрын

Finally a good video regarding the melting integral I²t! Thanks Mr.Yaakov, again!

@sambenyaakov 5 ай бұрын

👍🙏

@Zetex2000 5 ай бұрын

Thank you for video. Very interesting and new stuff for me. I always wondered as a kid, why a 1A doesn't melt at 1A. felt like a scam 😂

@sambenyaakov 5 ай бұрын

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.

@mojiiim.r9446 4 ай бұрын

thank you ❤

@power-max 5 ай бұрын

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

@sambenyaakov 5 ай бұрын

Yes, ST just came out with a controller. But modeling is still important😊

@petarsimic4097 5 ай бұрын

great video! as always...

@sambenyaakov 5 ай бұрын

🙏🙂

@MegaMoriarti 5 ай бұрын

Thanks for your explanation

@sambenyaakov 5 ай бұрын

So nice of you. Thanks

@MegaMoriarti 5 ай бұрын

Could you model the positive thermal coefficient of the fuse wire, I think the RT region could look like different @@sambenyaakov

@sambenyaakov 5 ай бұрын

It can be done by a variale resistor of course. Yes, it might change the shape. This is home work.

@analoghardwaretops3976 5 ай бұрын

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 5 ай бұрын

Thank you for comment, but I don't follow. Please eleborate.

@analoghardwaretops3976 5 ай бұрын

@@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..