Over-voltage and over-current protection: An example of a discrete design

[@robson6285]

This kind of video's i love the most, these in wich you analyse a circuit or circuitidea for a solution for such often appearing problems in our own circuits

[@sambenyaakov]

Thanks Rob for expansion

[@Costin.O]

Hello professor, I appreciate your detailed example and explanations! Looking forward to see your past and future videos!

[@sambenyaakov]

Thanks. Keep watching.

[@power-max]

Once again you read my mind! I need such a solution for my Tesla coil to minimize damage to parts when I push it a little too far. Thanks for the reference material! I realized the difficulty in hard switching a high voltage DC bus When I was attempting to use an automotive contactor at 200VDC. Into a resistive or inductive load, an arc is established over the contacts and persists until I remove power, and melts the contacts if not extinguished asap. That capacitance following the switch helps with soft switching, as it prevents series inductance causing a persistent arc to be established, but too much of it also means hard at switching on and might nesesitate a precharge circuit So a MOSFET or IGBT makes sense for this application of a hyperfast efuse, rated for the voltage and current. And looking around, turns out there are several expensive ICs that do exactly this, but it also seems like something easy enough to implement with descrete components, so this video will come in handy for my PCB design. Thanks!

[@sambenyaakov]

Thanks for note and sharing your experience.

[@bangadu_billa]

Thank you professor this video is good to clear basics before starting with commerical design.

[@sambenyaakov]

Thanks

[@sagarkshatriya4688]

This will help a lot to understand how advanced power management IC works. The concept and its presentation to make us understand was also awesome. Thanks for making such deep concept based video.

[@sambenyaakov]

Thanks. Comments like yours keep me going.

[@monguskooklord7867]

Cool circuit! I like designing this kind of low-level "power interface control logic". It lacks some of the glamour of high speed control systems but I find the opportunity for creativity in clean, intuitive design is sometimes overlooked.

[@sambenyaakov]

Thanks for comment

[@OdedArlevski]

Thanks for the explanation, Shmuel! I had the same problem in my design 🙏🏼 😉

[@sambenyaakov]

😊

[@mohammadhassanzade6893]

Thank you professor This is a very useful information for design intelligent switches

[@sambenyaakov]

Thanks

[@hamidk4772]

Outstanding job.

[@sambenyaakov]

Thanks Hamid

[@bhavikparekh2044]

Excellent video and great explanation. It would be great if you can give some design topologies for Integrated version of these circuits.

[@sambenyaakov]

I do not believe that an IC based version wil be superior

[@keithking1985]

God that was very enjoyable to watch and listen to...

[@sambenyaakov]

Thanks

[@moriergael2023]

Thanks, very interesting 😊

[@sambenyaakov]

Thanks

[@Antyelektronika]

Hi Proffesor, thanks for this video, in minute 12:49 you have added a diode D1, in normal operation when we have voltage on the output of this comparator this diode will not make any problems with operation of this circuit?. This diode will delete locking of our circuit. once again thanks for analog way in digital world.

[@electrowizard2000]

I believe the goal is to have memory only while input is high, and only latch on rising edge. So yes when input goes low the memory is reset.

[@sambenyaakov]

Indeed

[@sambenyaakov]

When Vc is high the diode is reversed biased. When Vc is low it forces a zero output no matter what.

[@iblesbosuok]

Thank you, prof. Yaakob, sir

[@sambenyaakov]

Thanks

[@armangevorkyan1975]

Thank you! It seams that circuit will work w/o D2. The latch will work w/o D2 am I right? The purpose of diode D2 is to have higher input impedance when comparator out is off?

[@sambenyaakov]

Strictly speaking you are correct. I chose to put the diode so not to be dependent of the output impedance of the comparator when the pulse is delivered.

[@Exponential_wealth73]

Appreciated your effort for us Sam ben, you are making this video for us in the middle of rocket attacks and tension. Must appreciated. Please Stay safe and lots of love from us ❤️.

[@sambenyaakov]

Thank you for caring. For me video preparation is a relaxation, and. ..my office is in my home shelter 😊

[@fredflickinger643]

Thank you!

[@sambenyaakov]

Thanks.

[@ahmedquraishi6465]

How to implement cycle by cycle current control. Can you please do a video for that.

[@sambenyaakov]

Look up the papers by Smedley.

[@ahmedquraishi6465]

@@sambenyaakov Thank you

[@nachiketadeshmukh8444]

Hello Prof. Can you make a video on analog implementation of advanced linear controls? such as one cycle control or pole placement control?

[@sambenyaakov]

Will try. Did you see the control videos in my KZbin channel e.g. kzbin.info/www/bejne/gmSwg6F7jsmcbsk

[@amruthakn6419]

i have confusion in difference amplifier circuit. wt is it doing

[@sambenyaakov]

If you have a specific question you can ask.

[@wasifamashiyath8508]

Sir, will you please tell me which model file of MCP6541 you have used? Thanks in advance.

[@sambenyaakov]

HI, AS it happened I had to switch laptops and I do not have the older LT library so I can not get the model. But, you really do not need this particular unit you can use in its place the LT comparators shown.

[@sabbirahmed3034]

I am facing error using MCP6451 comparator in LTspice. It says "time step too small". I had to import the model as it was not found in the component section of LTspice. I would appreciate any advice on this.

[@sambenyaakov]

This is because of the fast transition Try to use relaxed tolerances (at the SPICE hammer in the Control Panel

[@sabbirahmed3034]

@@sambenyaakov Hello sir, I have set the tolerance values from control panel to values like 250, 100 etc, but I am facing the same probem.

[@sambenyaakov]

@@sabbirahmed3034 Just use another comparator from LTspice library.

[@sabbirahmed3034]

@@sambenyaakov I used the LTC6702 comparator from the LTspice library but the output I get is not what I expected.

[@sambenyaakov]

@@sabbirahmed3034 Not as expected - In what respect?

[@ahmadshahmohammadi7217]

Hello, Could you please share the simulation files here with us?