power electronics

  1. S

    Low frequency oscillation induced during CCPS discharge.

    Hello all, I am designing a CCPS and using a phase-shifted, series-resonant bridge as the switching topology. There is a DC block capacitor in series with the transformer primary winding. When the target voltage is reached, the H-bridge switches are turned off until a command for the next...
  2. riccmez

    Can't find out what component it is exactly

    Hello, I'm trying to simulate an AC/DC converter for a class project. Now, this was an assigned circuit there isn't much I can do about the design. There's on component that I can't quite figure out. as far as I researched I understand that it is a sort of bidirectional thyristor but don't...
  3. VektorElektor

    Buck Converter Simulation in Python

    Hey everybody, first time here! As a personal project I am implementing a Buck Converter simulation in Python. My basic idea is to give a constant Vs supply and simulate the switch on/switch off steps in each switching period, calculate the increase/decrease in inductor current and calculate an...
  4. dr3iz

    How to connect PMOS in parallel

    Hi, we are designing a 48V high side MOSFET switch and we realised that the our mosfet gets too hot. Our solution is to connect additional mosfets in parallel to distribute the load/heat. But I'd like to ask your how to properly connect PMOS in parallel. I read somewhere that the gates should...
  5. -live wire-

    DIY E-Scooter help - electronic breaking, pcb design

    Hi, I'm a rising freshman at Case Western University, and I would like to make an an electronic scooter to get around campus before I move in in about two months (mid august 2023). I already have a lot of the parts I would need for the project, like motors and motor controllers, among other...
  6. S

    4-20ma to 0-3.3V conversion using Rail to rail Opamp

    I am trying to convert 4-20 mA current loop signal to 0-3.3/0-3 V output for my 10 bit ADC IC that is connected to a Raspberry pi 3B+. Schematic: The input sensor is a 12 V loop powered 4-20 mA output humidity sensor. The op-amp is an MCP6002 rail-to-rail. The output of the op-amp is...
  7. B

    LLC converter working above resonance

    Hello I am designing LLC Half-Bridge converter. Pout = 500W Out= 12V Vin=390V Fr = 80kHz Lr = 30 uH, Cr = 120nF , Lp = 190uH The converter is working always above resonant frequency. The oscillographs you see are measured in 200W Pout. As you can see the green channel is Lr current, red channel...
  8. A

    Gate-source voltage waveform in brushless motor drive

    What should be the gate-source voltage waveform of the high side MOSFETs in a brushless motor drive with a trapezoidal control method? Are these parts marked in red in the picture above normal? There is no such thing at the bottom side MOSFETs Schematic: When I reduce the value of R47 and...
  9. kwoki

    Power dissipation of synchrononous buck converter cannot be reduced with gate drivers?

    Hi guys, For this project, I had to want to reduce the power dissipation (< 2 mW) when the Rload is 54 Ω. These are the two circuits that I have employed. When I sweep the pwm frequency vs Pdiss (power dissipation of the buck converter), without/with the gate driver, I have the following...
  10. jbHardwareDev

    Dual mosfet switch problem

    Hi. I plan to make a pcb that drives peltier and heating pad. Only one of those works at the same time. Load elements are parallel to capacitors. I have very little space on pcb so it would be nice if I could use only one inductor as it is in screenshot. I know it would be easier just to put...
  11. C

    The Question about MOSFET Library Parameters in LTSpice

    Hi I am doing a double pulse test of MOSFET (PN: IAUS300N08S5N012TATMA1). Since we have high voltage spikes and oscillation of Vds in hardware testing, I am also working on LTSpice of double pulse test. I am so confused about the parasitic parameter of the MOSFET lib, I know the MOSFET has...
  12. C

    Thermal Design Question about Multiple MOSFETs paralleled for Single Cold Plate

    I am a student in power electronic filed. When I design PCB and calculate the junction temperature of MOSFET, I am very confused about the thermal design question. My PCB design is here: (in the middle of the figure) : three MOSFETs in parallel, so 12 MOSFETs(Rthj-c=0.4 from datasheet) in one...
  13. AhmedKhouaja

    MOSFET Power Loss calculation ?

    Dear All About Circuits Team, I hope everyone is doing well, I have a question about the MOSFET's behaviour, How can I figure out how much heat the Mosfet produces per amp and how much current it can consume when acting as a load? Below, the Mosfet application shown in the figure, it's an...
  14. S

    Capacitor calculation with real and imaginary parts for a resonant converter

    Hi All, I have designed a resonant LCC converter for my thesis. It has been some time since I visited the theory and believe I used the following document by Robert Steigerwald to select the resonant components: IEEE Xplore Full-Text PDF: I was attempting to rearrange this equation for the...
  15. A

    How to Choose Best 650 V , 60A GaN Transistors for Switching Losses ?

    Hi , I will calculate GaN transistors switching losses in Dc DC converter Systems. The formula is , Psw= Vds*Id*fsw*((Ton+Toff)/2) . Vds and Id are drain-source voltage and drain current of the device at OFF and ON intervals respectively. fsw switching frequency and Ton is switching time...
  16. sego_sk8

    Having Trouble with multiplier in PSIM

    Hi everybody. I’m trying to simulate a circuit with a PI PB control, the problem is when i use the multiplier block the result isn´t correct. For the purpose to explain what´s going on please look the image below. There are 3 voltage probes (V1, V2, V3). In the simulation you can see the...
  17. L

    Determine Instant Time on IGBT

    Hello everyone, i found an appilcatin note to appyling IGBTs and there are Formulas to calculate turn-on/off switching Energy on IGBTs my question is, how can i determine t1,t2,t3 and t4? Thanks
  18. ashokraj

    what is the difference between these two supplies

    I am wondering how will these two differ, One is Ac to DC converter module, second one is SMPS. Link1(AC to DC module) Link2(SMPS) when link 1 is available in a small size than Link2(SMPS). Under what circumstance we have to use Link1 and link2. I understand that SMPS is 5watt, Link1/Module...
  19. ashokraj

    Is it better to specialize in one area( Hardware or software) or is it better to learn about everything(power electronics, Digital electronics, Analog

    Hi, In my first job I have worked as an Embedded systems engineer (with major focus on software) for 1.5 years. I am currently working as a hardware engineer for 2 years. Considering the long term success, is it better to specializing in one area( Specifically analog electronics or...
  20. F

    Best DC-DC Converter Topology

    Hi, I'm looking for a DC-DC converter topology with the following characteristics: Input Voltage Range 2.7-5V Output Voltage: 12V Output Power: 1kW It is not of primary importance the isolation. Do you have any suggestions about the most suitable DC-DC converter topology (high power and high...
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