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.
@electronichome11535 ай бұрын
Finally a good video regarding the melting integral I²t! Thanks Mr.Yaakov, again!
@sambenyaakov
5 ай бұрын
👍🙏
@Zetex20005 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.r94464 ай бұрын
thank you ❤
@power-max5 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😊
@petarsimic40975 ай бұрын
great video! as always...
@sambenyaakov
5 ай бұрын
🙏🙂
@MegaMoriarti5 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
4 ай бұрын
It can be done by a variale resistor of course. Yes, it might change the shape. This is home work.
@analoghardwaretops39765 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..
Пікірлер: 20
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.
Finally a good video regarding the melting integral I²t! Thanks Mr.Yaakov, again!
@sambenyaakov
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.
thank you ❤
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😊
great video! as always...
@sambenyaakov
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
4 ай бұрын
It can be done by a variale resistor of course. Yes, it might change the shape. This is home work.
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..
👍🙏❤️
@sambenyaakov
5 ай бұрын
🙏😊👍