- Видео 80
- Просмотров 1 395 676
Biricha
Канада
Добавлен 30 сен 2014
Easy to Follow Voltage Mode vs Current Mode vs Voltage Mode + Voltage Feedforward Control Methods
When applied to switch mode power supplies, the most common control methods are Voltage Mode Control, Peak Current Mode Control and Voltage Mode Control with Input Voltage Feedforward.
In this video, Dr Seyed Ali Shirsavar of Biricha Digital will explain, in his easy to follow way, how these control methods work, what their advantages and disadvantages and which one is most suitable for your application.
A more detailed presentation including an easy to follow Power Supply Control Method Selection Flowchart can be downloaded from here:
www.biricha.com/psudf-vimode
For our current sense circuit design video please visit here:
ruclips.net/video/OORRDhLAUEE/видео.htmlsi=Ds9sgSEUlD6YBMiz
In this video, Dr Seyed Ali Shirsavar of Biricha Digital will explain, in his easy to follow way, how these control methods work, what their advantages and disadvantages and which one is most suitable for your application.
A more detailed presentation including an easy to follow Power Supply Control Method Selection Flowchart can be downloaded from here:
www.biricha.com/psudf-vimode
For our current sense circuit design video please visit here:
ruclips.net/video/OORRDhLAUEE/видео.htmlsi=Ds9sgSEUlD6YBMiz
Просмотров: 2 712
Видео
Synchronous, Asynchronous, Diode Emulation! Which Switching Strategy is Best for your Application?
Просмотров 1,9 тыс.14 дней назад
There are several popular switching strategies when it comes to switch mode power supplies such as Asynchronous, Synchronous and Synchronous with Diode Emulation. In this video, Dr Seyed Ali Shirsavar from Biricha will explain how these three strategies work based on a Buck topology, what their purpose is, and how to chose the most suitable strategy for your application. A detailed presentation...
MOSFET Gate Drive Resistor Selection - Part 2: Turn Off
Просмотров 3,1 тыс.21 день назад
In this is Part 2 of our mini-series on Power Supply MOSFET Gate Resistors Selection, Dr Seyed Ali Shirsavar of Biricha Digital describes how control to turn off speed of our MOSFET independently of its turn on speed. We show how to design a popular MOSFET turn off circuit, how to select the turn off diode and show some nice experimental results. For resistor selection please see Part 1 of this...
Current Transformer based Current Sense Circuit Design for Current Mode Power Supplies
Просмотров 1,9 тыс.Месяц назад
In this video Dr Seyed Ali Shirsavar from Biricha explain the operation of a current sense transformer and how we select the correct one for our power supply. We also discuss "current gain" of our current sense circuit for loop disguises and how incorrectly selected current transformer could cause a flattening of the current sense signal and subharmonic oscillations. As it is customary in our v...
How does an EMC Current Clamp Estimate Radiated Emission?
Просмотров 1,9 тыс.5 месяцев назад
In this video Dr Ali Shirsavar from Biricha Digital explains, in simple terms, how an EMC current works and how we use it to estimate radiated emissions to before going to the EMC test chamber. As it is usual in our videos, there will be a practical demo at the end. In a future video will also show how to use the Transfer Impedance plot to calculate the exact value of our measured currents.
Easy Explanation of Units Used in EMC Measurements (dBm / dBuV )
Просмотров 3,2 тыс.6 месяцев назад
Units used in EMC test and measurement such as dBm, dBuV etc. can be confusing. Using numerical examples, in this video Dr Ali Shirsavar from Biricha Digital explains these units in simple terms shows a practical example using real life measurement. A presentation with all the relevant equations can be downloaded from here: www.biricha.com/psudf-dbm
PSU Design Fundamentals: Experimental Demonstration of Inductor Back EMF
Просмотров 2,1 тыс.7 месяцев назад
In one of our previous videos we explained the action of an inductor in a switch mode power supply. This is the second part of our introductory videos about inductors. In this video, we will demonstrate just how big an inductor back EMF can get even when energised with a tiny battery. By simply breaking the current path of an inductor we light up, albeit momentarily, a 230V lightbulb with a sin...
LISN Construction - What is inside of a LISN and why the DUT sees a 50 ohm impedance only
Просмотров 3 тыс.7 месяцев назад
In one of our previous videos, we explained the purpose of using a LISN (Line Impedance Stabilisation Network) and how it functions. In this video we open one up, look inside and see why the load sees 50 ohms only. We then measure the impedance of the LISN in the lab with a Bode100 and show that at high frequencies LISN impedance is indeed 50 ohms. You can download a presentation with more deta...
LISNs Explained in Simple Terms: What Is the Job of a LISN & Why Do We Need it for EMC Testing
Просмотров 5 тыс.7 месяцев назад
A LISN (Line Impedance Stabilisation Network) is by far simpler than its complicated name suggests. In this video, Dr Ali Shirsavar from Biricha Digital explains the purpose of using a LISN, its functions, its circuit and why we have to use one when doing EMC measurements. In the next video we are going to dissect a LISN and see what is inside You can download a presentation with more details f...
When to Use Average Values When to Use RMS Values for Power Calculations
Просмотров 4 тыс.8 месяцев назад
In this video, Dr Ali Shirsavar from Biricha Digital explains when we should use Average values and when we should use RMS values in our power calculations and why.
Input Capacitor Selection for Power Supplies (Part 3 - Electrolytics/Bulk)
Просмотров 3,6 тыс.8 месяцев назад
Input Capacitor Selection for Power Supplies (Part 3 - Electrolytics/Bulk) This is Part 3 of our 3 part video series on Input Capacitor Selection. In this video we will discuss how to calculate the size for our energy storage/bulk electrolytic capacitors including voltage rating and ripple current rating. We will then use REDEXPERT online tool to narrow down our choice down and select a suitabl...
Input Capacitor Selection for Power Supplies (Part 2 - Ceramics)
Просмотров 3,8 тыс.8 месяцев назад
This is Part 2 of our 3 videos about Input Capacitor sizing and selection for switch mode power supplies. In this video we show how to calculate exactly how much ceramic capacitance we need on our input in order to reduce our input voltage ripple to a specified value. In the next part we will do the same for Electrolytics You can download the detailed presentation from www.biricha.com/psudf-inp...
Input Capacitor Selection for Power Supplies (Part 1)
Просмотров 7 тыс.8 месяцев назад
This is Part 1 of our 3 videos about Input Capacitor sizing and selection for switch mode power supplies. In this video we talk about why we need input capacitors, what roles ceramics and electrolytics play and we will show on an oscilloscope, how the noise on our input voltage changes with varying amount of capacitance. In the next 2 videos we will show exactly how to calculate the amount cera...
Impact of MOSFET Gate Resistor on the EMI & Noise Spectrum of a Switch Mode Power Supply
Просмотров 10 тыс.8 месяцев назад
In this video we will demonstrate why slowing down our MOSFET in a switching power supply can help us pass the EMC test. We will change our turn on and turn off times of our FET by changing our Gate Resistor and show its impact on the power supply's noise spectrum on a spectrum analyser Please visit our website below to download the accompanying presentation PDF: www.biricha.com/psudf-mosfet-gate
MOSFET Gate Drive Resistor Selection - Part 1: Turn On
Просмотров 23 тыс.9 месяцев назад
In this video, we will describe how to quickly select a "near optimum" value of your Gate Drive resistor in a MOSET driven switch mode power supply during turn on. The methodology described here should give you a good comprise between fast switching speed, low EMI and low time to market without difficult measurements. For detailed mathematical analysis and accurate equations, we highly recommen...
Miller Plateau effect within MOSFETs explained - a simple and intuitive approach
Просмотров 22 тыс.9 месяцев назад
Miller Plateau effect within MOSFETs explained - a simple and intuitive approach
Understanding Maximum Power Transfer in less than 3 mins
Просмотров 2,4 тыс.9 месяцев назад
Understanding Maximum Power Transfer in less than 3 mins
PSU Design Fundamentals: Inductor Behaviour in a Switching Power Supply
Просмотров 4,7 тыс.11 месяцев назад
PSU Design Fundamentals: Inductor Behaviour in a Switching Power Supply
Power Supply Noise Issues: Interwinding Capacitance vs Leakage of PSU Transformers
Просмотров 7 тыс.Год назад
Power Supply Noise Issues: Interwinding Capacitance vs Leakage of PSU Transformers
DC bias loss in ceramic capacitors: watch the resonant frequency move in real time!
Просмотров 4,6 тыс.2 года назад
DC bias loss in ceramic capacitors: watch the resonant frequency move in real time!
Does your PSU have a RHPZ? How to solve this problem
Просмотров 4,5 тыс.2 года назад
Does your PSU have a RHPZ? How to solve this problem
Mixing ceramic and electrolytic capacitors on the output of power supplies
Просмотров 18 тыс.2 года назад
Mixing ceramic and electrolytic capacitors on the output of power supplies
Power Supply Compensator Design without Equations
Просмотров 16 тыс.3 года назад
Power Supply Compensator Design without Equations
Digital PFC Design with STMicro & Biricha ST-PLD Free design tool
Просмотров 4,2 тыс.3 года назад
Digital PFC Design with STMicro & Biricha ST-PLD Free design tool
Designing a Digital Power Supply with STM32 Microcontrollers
Просмотров 15 тыс.4 года назад
Designing a Digital Power Supply with STM32 Microcontrollers
I heard that Current Mode is easier to compensate compared to Voltage Mode, for there is no complex conjugate poles. Is that correct?
Fabulous video. I recommend all your teaching videos, they are such a valuable resource. Thanks for producing and sharing them.
I have a question this way the turn off time is always faster than the tun on isn't it?
A pleasure to follow your teachings on all these subtleties and techniques of power electronics. Regarding your series on capacitors, which capacitor technologies would be most appropriate for the creation of compensation networks (error amplifier) of SMPS ? Thank you
I'm not the poster, but I believe ceramic caps are pretty common for the PI / compensation amp. They have good capacitance density so they can be quite small. X7R dielectrics are pretty common; they have good capacitance density (lot of capacitance in a small package), usually have a ±10% tolerance but the capacitance has some voltage dependence. C0G dielectrics are also available; they have lower capacitance density but have very little voltage dependence and are available with ±5% tolerance. X7R is usually good if you need a larger capacitance and / or precision is not too important like filtering applications and C0G is generally better for applications where precision is important like setting a precise delay time. There are other ceramic dielectrics available that you can check out if you're curious.
Awesome. Thank you for this direct explanation. It helps contextualize the control schemes I've seen and clarifies the advantages and disadvantages.
Every video is just great! You really have a gift for explaining these things.
Hi. I have trouble with my halfbridge inverter for induction heating. I get high voltage spikes that i cant seem to get under control, so voltages are building up on the gate of the mosfets. Can you please help or advise?
Thank you, Sir 🙂👍🇹🇷
What a beautiful explanation. I cant skip your video. You make learning more interesting. Thank you sir
Solid video. Just a few new points. Minimum 2 samples per RBW. This scope has a fixed 751 sample span. Thus, 9000/2 * 751 gives a max span of 3.38MHz. So you can't actually sweep from 1MHz to 30MHz all at once. Also, there is a minimum required sample time of 200s / MHz for the EMI filter. I think sample time is in the sweep menu?
Thank you. you are the best teacher.
Useful for me
Also, this diodes keeps the circuit alive during the dead between two MOSFETs.. Agree?
Do electrolytics need to be used to replace electrolytics??? Like if I want to recap electrolyics in a audio mixer or power supply can I use something that will fail clean rather than spilling its guts?
Do electrolytics need to be used to replace electrolytics??? Like if I want to recap electrolyics in a audio mixer or power supply can I use something that will fail clean rather than spilling its guts?
1) An inductor charges ( positive voltages) and discharge ( negative voltage) with the same direction. 2) A capacitor charges and discharges with opposite directions. During switch off, should the negative voltage/current go with the same direction with the "switch on one", from the load resistor -> the anode of the Free wheeling diode instead of counter clockwise?
Nice as always .
Very informative. Thank you Sir.
thank you
I am every time astonished by the ability of this man to explain things in a simple, short and totally clear way. IDK why this channel doesn't have thousands of subscribers.
When I watch these clips, I miss engineering
Everything clear now! Thank you! I wish i had teather like You in the past. 😊
Thanks, I like the explanation on paper, that's master.
I wanna clean up the ac mains from emi, rf and common amd differential mode noise ..can i do that by 4 seperated board ?and is it possible to clean up from 50hz to 30mhz?
Hi. Does this apply to inductive loads as well as to the logic level signal? is there any formula for gate resistance ?
These theory & practice videos are fantastic, thank you very much 🙏
Very well explained. Thank you!
Best explanation ever! You made so easy to understand. Thank you.
Thanks, master.
How to suppress the current spikes in the secondary of the current transformer I tried RC filter but the spikes are still there it effects the shape of the secondary wave form but not the spikes
I love this content! thanks!
So, you don't need compensation ramp, with big ratio of current transformer?
Hello sir, I would like to ask if there is any way to apply automatic control signal block diagrams to the design of electronic circuits using discrete components? For example, design a common E audio amplifier circuit using BJT.
Thank you for the great content. Can you also do a video about reverse recovery of diodes on power supplies? Much appreciated.
Dea sir, thank you for the video. What path the reverse current through the diode take? Can the gate driver absorb this current?
Very clear explanation! Great video!
Great video, really like it
In the turn OFF, there is only lets say 5V difference between the Gate and the source, instead of the 100V difference. Can someone explain that please?
Thank you ❤
Thanks, Dr. Seyed, I’m just starting in electronics and your explanation on a question that I had is very helpful . Thanks a lot for a great lesson.
Thanks a lot for the great video. Is it possible to use a whiteboard instead please? I understand that this is a weird request. But the marker on paper makes a sound that is hard for some people (not everyone) to tolerate. I am sorry for this strange comment. Thank you again. you rchannel is amazing.
but if there is no hall sensor in place, how is this useful for measuring the DC component of the current? I can see it will measure the AC component of the current waveform but the DC component seems to be lost while with the sense resistor you measure the whole waveform
Thank you Dr Seyed Ali Shirsavar, I saw such circuit in the B-G474E-DPOW1 Discovery kit from ST, in the Buck/Boost sub-system and I've always wondered why and how it works! Thank you very much for the explanation and the demo. You're a good teacher :)
Thanks Ali for your educational videos, this video like your previous videos was very informative, Questions: What modelwas the current probe? What was the model of your scope? Thanks
I have very large ferrite core it’s a 20kw transformer I use 24 gauge copper wire 6 together for a smps welder am building everything work but the transformer make a lot of noise when the overloaded senor reduces the duty I don’t have any issues when the arc welding but when it sticks the senor activate and the noise is there i gat wire space of 1 cm per turn and use glue to stop wire from moving when the high current is welder mother moves is a toroidal core but still the noise I rewind it for no space and wire all wound tightly the with the right phase but still noise the current sensor controller is the issues I use CT senor and a small ferrite ring to remove the frequency from getting into the ic the same thing happens the frequency is 50khz is there anything that can be down to stop the noise when current sensor activated
how the hell is biricha the only source of information for digital compensator design
What's the current clamp used?
BS app and all limited and give wrong info to take app? that is useless dont install
Very nice explanation!!
It just has a big like, thank you.