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3 жыл бұрын
3 жыл бұрын
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3 жыл бұрын
Пікірлер
@nutcrackerscrack9861 Ай бұрын
Thank you
@zeljkoadzic1692 3 ай бұрын
Hi. Does this apply to inductive loads as well as to the logic level signal?
@pauljstar 12 күн бұрын
Inductive loads are going to respond to whatever signal you put into them. The point of the FET is to translate the low level decision making to the heavy lifting portion that makes sense for the induction (solenoids, motors, etc). If the logic level side of the FET is protected, then the load side won't notice a different. However, if levels breach or the nature of the waveform changes from what you're intending then the motor will react to the frequency content. Hope that helps!
@davidjackson2115 6 ай бұрын
Volumes low. But youve got one of those very few voices that I can listen to and lap what yr saying without getting pissed off. kudos.
@DecaDecaMusic 8 ай бұрын
Are you aware of a MOSFET design that could work if there was a load on the high side or low side? Like one circuit that can handle both load configurations
@pauljstar 7 ай бұрын
I would just use a high side MOSFET for one application and a low side MOSFET for the other application. It's unusual to move the load's highside or lowside position dynamically in the application (there isn't a lot of reason to do so). Switching between highside power directions is the basis of H-bridges for clockwise and counterclockwise applications.
@markkushrov4248 9 ай бұрын
Hi Paul, I want to talk with you about something. can you share your email with me, can find it.
@TarihveDoga Жыл бұрын
Can you help me? Transient Analysis Limits , V(OUT1) . V(OUT2) error , What can I do? which is it operator?
@pauljstar Жыл бұрын
well, with the way you've communicated, it's a very generic question. If you can narrow it down for me I'd appreciate it. Usually, problems with limits tend to be about naming things. It's likely that you don't have an "OUT1" or "OUT2" node in you circuit...so MC12 would choke in that case because its trying to process something that isn't there.
@cristianstoica4544 Жыл бұрын
I'm just learning Microcap right now. Thanks for the series. I(N1,N2) is the notation that you missed during the recording. However, it seems to get wrong results if there are multiple paths between the nodes (it does not give the total current but only the current through one of the paths)
@Sh4dowHunter42 Жыл бұрын
Great tutorial, is there anyway you could go through some comparator circuits in MC12?
@charleschandlertornadoelec6231 Жыл бұрын
Micro-Cap 12 won't let me put a conditional statement in its capacitance parameter to vary its capacitance per conditions. I'm using this capacitor as a throttle which I name: 'tcap' ... .define tcap {100f + STOP} .define STOP if(I(IndLoad) > 300, 30p, 0) The intention is to raise the capacitance of tcap to 30pF (or, more) if its current should rise to a minimum of 300 amperes. Its default capacitance is 100 femto Farads. What do I do?
@pauljstar Жыл бұрын
Great question! I'll study and get back with you. I'm traveling now
@sc0or Жыл бұрын
Learn W shortcut ) That's not a noise simulation. That's a 2+2 example
@natewelch6490 Жыл бұрын
Is there a way to do an FFT and see the frequency response of the filter?
@user-vk8jn5br1f Жыл бұрын
Thank you so much
@jeffreylangford962 Жыл бұрын
Like your vid thank you
@pauljstar Жыл бұрын
Glad to help
@CircuitShepherd Жыл бұрын
👍
@marcinfisior1932 Жыл бұрын
Remember that like every diode zener diode have a capacitance so with series driver resistance you create an RC filter that slows down MOSFET switching time and therefore you increase switching losses. Moreover in real world circuits with proper layout and if driver have stable power supply the overvoltage doesn't come from driver but from upper MOSFET switching in Half-Bridge that charges miller capacitance of bottom MOSFET.
@Sh4dowHunter42 Жыл бұрын
Thanks for another great video!
@pauljstar Жыл бұрын
Glad it was helpful to you!
@ljay0778 Жыл бұрын
I am learning something!
@Sh4dowHunter42 Жыл бұрын
Awesome tutorial thanks!
@siddhantpurohit4989 Жыл бұрын
Can you provide the calculation for resistor used for zener protection
@pauljstar Жыл бұрын
I'll try on a new video if possible. It's a bit more than what can be conveyed easily for inline on comments
@dharmakissoon Жыл бұрын
Very nice well explained video....hey i need about 140 volts transformerless about 60 amps.any suggestions? Thanks
@dharmakissoon Жыл бұрын
@@pauljstar hello thanks for replying. Scratch those numbers im looking for 40 amp 90 volt dc charger with current variable.its for a e bike if you design and put it on ebay ill gladdy purchase it thanks.
@alocin110 Жыл бұрын
Your are mumbling and chewing words in your nose. It sounds as the voice coming from your as s . I disliked and blocked your channel by putting your channel id in my firewall to never to watch stupid things ever again. disliked.
@Dc_tech386 Жыл бұрын
What about inverter circuit this would apply or not
@Dc_tech386 Жыл бұрын
Can’t this circuit applies to high and low side in a inverter circuit
@Dc_tech386 Жыл бұрын
What am worried about with the 100k at the gate to driver the mosfet won’t get enough current to charge up the gate
@pauljstar Жыл бұрын
100 ohms was used in this example. You are correct 100 kOhms would potentially cause the MOSFET to be slow at turn ON. 100 kOhm would form a RC network with the innate input capacitance of the gate and source.
@Dc_tech386 2 жыл бұрын
Interesting I love building circuit but indeed help with understanding how mosfet work in inverter why I ask is because I build and inverter circuit but I can’t get the mosfet to switch in conditions mood to power the transformer I flow all the right instructions on a circuit i same on KZfaq but I can get the mosfet to conduct is it the transformer why the mosfet not inverting I use a low frequency transformer and high frequency transformer to the high one only buzzz and no voltage so I need some information about what am doing wrong
@pauljstar Жыл бұрын
What inverter see you using? What are you trying to do?
@prabalrana5981 2 жыл бұрын
Current flows from Source to drain in PMOS so how you can connect it''s drain to Vin and source to Vout ....
@kunalburman2895 2 жыл бұрын
Hello, Thank you for your explanation. I wanted to know how can you protect 50 v in the Output?
@pauljstar 2 жыл бұрын
I have a video on this. As in protecting the load from 50V and higher? Often you can use overvoltage protect circuits at the power supply's input. This would mean placing a pchannel in the highside or nchannel in the low side. Nchannels in the highside work also but must be enhanced by another driver circuit. This function is called "load switching" Sample the power supply input using resistor dividers (hundred kilo-ohm scale) and compare that to a voltage reference circuit (say 35 V). When the comparison proves an overvoltage event has occurred, shutdown the load switch and prevent access to the load. An analog is when someone keeps asking you for money or services...a little is ok but eventually you have to cut them off. For other kinds of overvoltage protection use a transient voltage suppressor (TVS) diode for events like electrostatic discharge (ESD). They are designed to handle the higher rate of voltage change (dv/dt) where the OVP circuit handles slower transient events.
@kunalburman2895 2 жыл бұрын
@@pauljstar Thank you for your reply. Please can you share that circuit?
@moonswhite1409 2 жыл бұрын
Also make video on how to use Crystal in micro cap
@pauljstar 2 жыл бұрын
Crystal oscillator you mean right?
@moonswhite1409 2 жыл бұрын
Can you make video on basic and. Power full things to know in micro cap software for beginners
@moonswhite1409 2 жыл бұрын
@@pauljstar How to probe multiple points in Schematic and view it on graph at same time
@jaredp4478 2 жыл бұрын
Hey! Great video, i'm excited to check out the rest of your channel. I'm reverse engineering a electric power steering pump driven by a quite large BLDC motor. The input is fused for 80A of 14V. The pump is controlled by some sort of microcontroller that uses CAN inputs for steering angle and vehicle speed. I want to simplify it's control to just take vehicle speed so I can use this pump in retrofit applications without CAN. This control board interfaces with a daughter power gate board with very large mosfets and capacitors. That board has 6 inputs for P and N channel control of the 3 phases, and 4 other IO pins that I can't really determine, likely for BEMF feedback to the control board, there are no hall sensors so I assume BEMF control. I came across this IC because I want to replace the CAN control board with my own microcontroller and an IC to drive the power gate board, utilizing the existing large mosfets that are heatsinked to the pump case. I plan to do this retrofit numerous times so I'm trying to be as pragmatic as I can and reuse expensive components if possible. I'm also decently out of my element here, so I would like the set up to be as simple as possible. Vehicle speed to my microcontroller, PWM from my microcontroller to an IC that runs my motor. Would you recommend this IC as the simplest way to control this motor? You mentioned that you need to use some trickery to get >100W motors to run, and I'm expecting this to be in the 1kW range. Also, how do you determine what is absolutely required for supporting electrical components for this IC? There are many pictured resistors, capacitors, diodes in the block diagrams in datasheets but I am totally unaware of how to select them or what they do. I understand many people reading this kind of datasheet would have intuition on what is makes sense, but I have no idea. Thanks for any help.
@pauljstar 2 жыл бұрын
Jeez! Fused 80 A at 14 V hints at nearly a 1kW nominal application. That's why high voltage becomes really attractive to avoid waste heat. Anyway, reverse engineering is fun and also really frustrating at times! Maybe I'll do a video on it if you give me more info (that isnt NDA). The support material from Toshiba isn't really sufficient unless it's for cut and dry applications. So, doing what you're doing is in the realm of r&d experimentation (as I was). First I would investigate the feedback loops of the application. If the orginal control requires hall sensors, the TB9061AFNG cannot innately handle that (unless again, trickery). It's older brother (part number escapes me) can...just search for the hall effect sensor version if that was the case. If it is BEMF as you say, the control type is important also. It could be using field oriented control (FOC) methodology instead of squarewave... squarewave is baked into the TB9061AFNG control program. Look to see how many sense resistors are present on the board...you need at least two to use FOC methods . If there is only one sense resistor it may work. Personally, I would not use BEMF to control such a high current application. Consequences of even small control failure are blown switches (MOSFETS). You can replace them when they break but often they are applied with a massive heat sink in mind (because of high current). Typically, that's done with a lot of board real estate metal (often copper) to dissipate. So, practically you have to bake the whole board then locally desolder to reach temperatures that would yield the tab weld/adhesion of the FET package. Overall, I understand what you're doing and thinking down this track will probably get you to your reverse engineering goals. Take really good notes and collect information about every domain to learn most from each sample
@user-uj3vi2qx3o 2 жыл бұрын
Why don't you use Dynamic DC analysis? It will give you the numbers instantly, no need to hit Run for Transient analysis every time!
@pauljstar 2 жыл бұрын
I use transient most of the time because it's a good habit to look at the waveforms. Real products in the lab almost always have frequency content to observe. Simulation in purely DC framework can mislead. But otherwise yes, that function absolutely saves time that way
@kimpoyguerrero 2 жыл бұрын
What is the advantage and disadvantage of using N channel on the low side over P channel on the top side side for reverse polarity protection?
@buffplums 2 жыл бұрын
Why don’t you just do a real world dead bug… bloody sims are nothing like real life
@pauljstar 2 жыл бұрын
Perhaps I will! I like doing theoretical models first and then updating with empirical model data. The theory gives you a range of what to expect and then the lab gives you reality haha
@PT-ij9hc 4 күн бұрын
If your simulation doesn't replicate real world conditions you are either... 1). Using a poor component model 2). Your simulation is wrong.
@Antyelektronika 2 жыл бұрын
It is possible to change theme in microcap, from white to more black, it is better to eyes :) thanks a lot
@marcin8132 2 жыл бұрын
Very good video!
@pauljstar Жыл бұрын
Thanks!
@marcin8132 2 жыл бұрын
Great tutorial!
@pauljstar Жыл бұрын
Thanks!
@jayturcotte1999 2 жыл бұрын
Your video is great thank you that actually helped me a lot.
@pauljstar Жыл бұрын
Great! Glad it helped!
@anondusery1271 2 жыл бұрын
Hello, does this data sheet specification "Vgs - Gate-Source Voltage: - 10 V, + 10 V" apply to what you are showing in the video? As in, do not supply more than plus or minus 10V to the gate from the driver? Gate-Source is confusing due to the MOSFET having a "source" pin. Does it really mean Driver-Gate Voltage?
@pauljstar 2 жыл бұрын
It may be in how you're understanding electronics terminology. There isn't really ever such a thing as a driver voltage without also specifying a driver return (or often called ground). Voltage always has two points of reference and that's why it is sometimes called "potential difference." So, if the voltage between the gate and source exceeds the limit for that device, then my recommendation is to avoid encroaching or tresspassing the border. Most MOSFETs have plus/minus 20 V limit between gate and source pins. Exceeding voltage limits between two places for most devices usually ends up in some kind of dieletric breakdown effects and several orders of magnitude change in resistance (failure mode: coerced permission; such as megaohms to single digit kilo-ohms). In applications which use MOSFETs in a highside position, it's possible to have voltages of gate to the system "ground" much higher than the limit between gate and source (because the source isnt connected to ground). The MOSFET only cares about itself...so if the application space or ecosystem that it's in is friendly to the device's limits, it'll behave the way it was designed or expected to.
@anondusery1271 2 жыл бұрын
@@pauljstar Thanks, I do understand potential difference, however I also appreciate the additional info you took time to share. Always willing to listen and learn.
@pauljstar 2 жыл бұрын
@@anondusery1271 of course, sorry if it felt weird. I never know where people are at or how they learned to speak about electronics. I taught some MSEEs while I was at ASC and you'd be surprised what crutch concepts were holding them together...so I don't like to assume anything anymore haha. Is there still something you wanted to know about gate-source limits? 🤔
@botak333 2 жыл бұрын
Hi sir its posible to use without mcu like a arduino?? Just for testing my motor run or no sir?? Because i buy second hand sir. Can u help me?
@Yash29Oct20 3 жыл бұрын
Hello sir, Can you please tell me how to assign parameters to a transformer. I tried to construct zener regulated power supply circuit, but was unable to execute because of above issue. Please reply.
@pauljstar 3 жыл бұрын
I'm not certain what transformer you might be talking about. It sort of depends what model you might be using. If you can send me that I can answer your question more specifically
@BS-my2ky 3 жыл бұрын
Thank you so much! Could you please so how to sweep a group components, e.g. R1 and R2 together from 1k to 20k by 1k steps.
@uvatham 3 жыл бұрын
Good
@pauljstar 3 жыл бұрын
Thank you!
@mygreatbigfoot1679 3 жыл бұрын
I was going to watch but instead of being kind and using type option you selected spider instead.
@jeditoto3441 3 жыл бұрын
A bit fast but great stuff
@piconano 3 жыл бұрын
I'm an LTSpice user for a few years now, and would like to move away and find a sw that has more ICs other than the ones made by AD. I tried Tina and didn't like it. Do you have a video or know of one that explains the advantages and disadvantages of Micro-cap compared to others? How difficult is it to find modern parts or make your own custom parts library?
@colingill9317 3 жыл бұрын
Great tutorial. I have a grid tie inverter that has 4 IGBTs FGL60N100BNTD and each one has a smd zener diode between gate and source. Would you know what value the diodes should be, please. Many thanks
@pauljstar 3 жыл бұрын
For an igbt that might be a little different...consult the datasheet for the transistor and determine the application context a little more tightly (like what kind of control signals are actuating these devices). I don't typically use igbts but the terminal vernacular is gate, emitter, and collector... igbts are basically a mosfet controlling a bjt. They do that because mosfets are fast and bjts conduct better in higher power applications (best of both worlds kind of thing). So, anyway, try to learn more about the drive system and design from there! Good luck!
@garrykraemer8993 3 жыл бұрын
Great presentation! Looking forward to watching more of your videos.
@bickyou4696 3 жыл бұрын
wow, just what i need now😘
@pauljstar Жыл бұрын
Great!
@Sh4dowHunter42 3 жыл бұрын
At 3:06 you drag your source voltage, and your wires in the schematic automatically update position, mine does not do that, is there a shortcut for that drag feature?
@pauljstar 3 жыл бұрын
Yes it's called rubberbanding
@pauljstar 3 жыл бұрын
It should be in the tool bar near by volatge/current/power indication toggles
@Sh4dowHunter42 3 жыл бұрын
@@pauljstar Ah, there it is Ctrl + Shift + R to toggle. Thank you.