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Questions tagged [power-electronics]

Refers to the conversion of electric power by using solid state components such as semiconductors. Can also generally apply to the field of electrical engineering which works with power electronics.

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How should we calculate L (inductance) value for a transformer

I am trying to design a transformer using LTSpice with the following specifications: Vin = 230 V @ 50 Hz Vout = 12 V @ 50 Hz Power = 10 W The thing I do not understand is how to calculate the ...
TechnoLover's user avatar
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1 answer
23 views

SCR - Current Varies with constant firing time

Please bear with me as I am not a power electronics guy. I have a circuit in a battery charger that triggers SCRs, attached here. I am generating fire pulse from MCU at constant timing measured with ...
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Proteus 8 issue [closed]

I imported a Voltage Regulator model Library(AMS1117 3.3V) from Digikey/Snap-EDA. However, no matter what configuration I use, output voltage is always zero.
Soham Ghaisas's user avatar
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1 answer
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Using Microchip Technology MCP39F521 (I²C Power Monitor) with 240V

In the sample schematic Microchip Technology supplies in the data sheet for their MCP39F521 shown below, it appears that V1- is grounded. (V1- and V1+ are input pins for determining voltage.) Does ...
Eric Lindsey's user avatar
2 votes
1 answer
86 views

Do you know this circuit? [duplicate]

I was checking the flipper Zero Wi-Fi Developer Board schematics and in the power section I bumped with this circuit, but I've never saw it before. Someone knows the name of the circuit or its purpose....
A. V.'s user avatar
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Good Oscilloscope for Power Electronics [closed]

Hoping to get recommendations on a good oscilloscope for testing power electronics in the 20W-240W range. My main use case will be to troubleshoot AC/DC power supplies. A specific need I'm concerned ...
Perry's user avatar
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1 answer
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LiFEpo4 issues and concern

I have a 200AH LiFEpo4 battery and I bought an inverter, my inverter has 4 output AC socket if I connected the 1st socket to airconditioneer and and the 2nd socket to the charger continue charging ...
LOVE-LIGHT LIFE's user avatar
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0 answers
49 views

Explination for arcing noise coming from protected power tap devices?

For years now there has been a random occurrence that happens with seemingly any power tap device I have with protection circuitry in it where it will make a audible buzzing/arcing sound for a few ...
Jacob Jewett's user avatar
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61 views

Regarding the voltage in the resonant circuit of a Class F amplifier

When checking the operation, the secondary resonant circuit discharges. When I checked with ADS, I confirmed that the voltage was not high enough to cause a discharge at 150V or less. Regarding the ...
kimura's user avatar
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1 answer
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Confused about layout guidelines for TPS63710 buck converter

The TPS63710 is a low noise inverting buck converter capable of a relatively high efficiency conversion from 5V to -3.3V (according to TI's WEBENCH tool), but an aspect of the datasheet's layout ...
AJ-D2's user avatar
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How to use a LTC4120-4.2 charger with a 12.6 µH wireless charging coil? [closed]

I am working on a project where I need to charge an LIR1220 lithium-ion battery. This battery has a nominal voltage of 3.7 V and a fully charged voltage of 4.2 V. I am considering using the LTC4120-4....
Sean O'Sullivan's user avatar
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0 answers
22 views

Buck Average Modelling

I completed average modelling with Voreperian PWM switch model as described in Christophe Basso's book "Transfer Function of Switching Converters" and I compared the average model with ...
Power Path's user avatar
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0 answers
36 views

Help decoding weird Id current behavior at high motor speeds!

I have implemented a motor controller which employs FOC to control the speed of a PMSM motor, similar to this: Normally Id reference (IDref) is set to 0 and only the Iq reference (IQref) (quadrature ...
AK47's user avatar
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0 answers
37 views

Ground connection of power converter and MCU

I've designed an AC/DC power converter PCB, with input, and output voltage sensing, but I have problem connecting it to microcontroller board, i'm using F28379D launchpad as the microcontroller. I ...
Saif 's user avatar
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3 answers
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How to measure battery voltage during charging?

I have a slight confusion regarding the battery. Suppose I have to charge a battery of initially 12V to 14.2V (full charge). My charger has open circuit voltage of 15V. When I connect it what voltage ...
kam1212's user avatar
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1 vote
1 answer
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Designing a 24 V output relay using PCF8575

For this project I am using a NUCLEO-F429ZI which interfacing with PCF8575 over I2C. I am operating the PCF8575 only as output. I have tested the PCF with NUCLEO and it works without any issues. But, ...
naman's user avatar
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1 answer
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I need a sensor setup to detect if something passes through an opening after I click a button [closed]

I am making a compartment that holds up to 7 different vitamin pills separately. Each of the 7 slots has a small doorway that allows the pills to exit from the slots (after I click the button) and ...
Mohamed Anwer's user avatar
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1 answer
53 views

PCB inverter design

While prototyping a inverter or a power converter on bread boards we use separate power supply for microcontrollers and separate supply for gate triggering. But how to design a PCB for an inverter or ...
Ranesh Subramani's user avatar
1 vote
0 answers
78 views

FTDI chip not working properly [closed]

I recently purchased an FTDI chip from AliExpress. However, every time I try to use it on Linux via the picocom command, it gives me a lot of unknown characters. I ...
Code Sir's user avatar
1 vote
1 answer
47 views

Peak Current in Electrical Discharge Switch FET

I am in the process of a designing an Electrical Discharge Machine (EDM) pulsed power supply. Many designs use a power FET to switch the voltage from a supply cap to appear across the spark gap where ...
Martin Bonfiore's user avatar
2 votes
0 answers
47 views

Input/ Output Impedance of Converter/Input Filter (SIMPLIS)

I'm trying to replicate an impedance plot showing the output impedance of the upstream filter and the input impedance of the downstream converter, but within the sample plot. Can I get help with: ...
RogerDodger's user avatar
1 vote
0 answers
130 views

Circuit works only when oscilloscope probe is connected and does not work otherwise

I have built the circuit shown below. The problem is that the circuit only works when I connect oscilloscope probes between node-A and the ground. If I remove or decouple the probe-ground from the ...
UTs's user avatar
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2 votes
2 answers
197 views

Designing Optocoupler circuit

I'm trying to learn how to design an optocoupler using 6N137. datasheet : https://www.vishay.com/docs/84732/6n137_vo2601_vo2611.pdf There is no CTR (current transfer ratio) value or graph in the 6N137 ...
Mhan's user avatar
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1 vote
1 answer
96 views

Connecting the LC circuit to dc voltage source without transient

Let's say I have following circuit where the transistors are controlled via a software in the microcontroller. I have been looking for a control algorithm how to achieve a state when both of the ...
Steve's user avatar
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1 vote
1 answer
53 views

Do we need MPPT in grid synchronization and string inverters? [closed]

I have two questions regarding the MPPT grid synchronization. I have seen that it takes a few minutes for the inverter to get synchronized with the grid. I want to ask that does the inverter first ...
kam1212's user avatar
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0 votes
3 answers
93 views

Help Needed with Compact Circuit Design for Pulse-Triggered Switch-Off Sequence

I am currently working on a small electronics project for my swimming club and could use some advice. Forgive me if this is basic, I'm really new to electronics. The project requires a compact circuit ...
Sean O'Sullivan's user avatar
5 votes
5 answers
1k views

How does MPPT maintain a constant voltage?

I have a slight confusion in the working of the MPPT algorithm in solar inverter. I am confused about how this converter maintains a constant 310V (required for H-bridge) with MPPT. MPPT is a maximum ...
kam1212's user avatar
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4 votes
1 answer
186 views

Switching between batteries and a power supply

I have a powerful system (can use up to 20A in max load when using batteries) that can be either powered by batteries, or when possible, by another power supply with the same voltage, so it stops ...
Gonzalo García's user avatar
1 vote
1 answer
56 views

How to determine the correct direction of the transformer winding (photo)

I'm winding a transformer for a DAB converter. Image link (MDPI - A DAB Converter with Common-Point-Connected Winding Transformers Suitable for a Single-Phase 5-Level SST System): https://www.mdpi....
Delta's user avatar
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0 votes
1 answer
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Yokogawa WT3000 don't boot

I have a Yokogawa WT3000 Power Analyzer which I was using with no problems and then I turned it off to take a break. An hour later, I tried to turn it on and I notice that it shows nothing on the ...
Franco Fischer's user avatar
3 votes
1 answer
113 views

Switching 5 kV for a neon sign

I have a project where I want to make something like a 7-segment display using neon tubes. Using neon tubes is a hard requirement, so I cannot use LEDs etc. I do not want to use one 12 ⇒ 5 kV ...
DarcyThomas's user avatar
0 votes
1 answer
46 views

How to control lightweight pull-up and pull-downs from GPIO-style pins?

I'm a novice at fine electrical theory. My daughter and I have a few micro:bit cards, and we're starting to branch out from basic servo robotics. One such project is controlling her train layout. We ...
Oli's user avatar
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1 vote
0 answers
45 views

Average Model of Buck Converter

I am trying to understand average model of Buck Converter for Peak Current Mode Control Topology. Below is a snapshot taken from the Christophe Basso Webpage https://powersimtof.com/Spice.htm, from ...
Power Path's user avatar
2 votes
2 answers
195 views

Calculating junction-to-ambient temperature rise for switching MOSFET

So I'm looking at datasheet's since I'm looking for a N-Channel MOSFET for a DC-DC Buck Converter that will be switching at 1.2MHz. Since the MOSFET will be used as a switch for the Buck Converter, I ...
J. Street's user avatar
2 votes
1 answer
95 views

What are the purpose of these components on my car ECU?

What are these metal "cages" around the capacitors as seen in the circuit below (2x).
wgthompson's user avatar
0 votes
0 answers
81 views

Bessel Filter to separate AC and DC at Supply Level

I have a Supply Source composed of 150 VAC @ 400 Hz + 48 VDC. It is used to supply a big relay (~ 4 H, 1820 Ohm). I need to extract the 48 VDC, filtering out the 150 VAC. I designed the following 5th ...
g.mezzina23's user avatar
0 votes
0 answers
56 views

Middlebrook Stability Criteria for Input Filter

I am trying to apply Middlebrook input filter stability criteria for Active clamp forward converter .So for finding Input filter output impedance over the frequency range is quite straight forward in ...
Power Path's user avatar
1 vote
1 answer
62 views

How would I go about supplying the measurement circuit with multiple batteries ouputting microAmps of current

If I am doing a test for lithium-ion batteries where I am trying to measure a small current when I apply a small load (on the order of microAmps) How would I go about using this same current to power ...
rel's user avatar
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2 votes
1 answer
35 views

Implementing triangular ramp in simulation

I am using the UCC256301 in a project (I know it says it is not recommended for new designs). I am trying to simulate my system using PLECS and it needs the controller IC's behaviour implemented. From ...
SM32's user avatar
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0 votes
1 answer
51 views

Three-phase controlled rectifier power reversal issue in MATLAB Simulink

I have built a fully controlled three-phase rectifier in MATLAB Simulink. Now according to theory for RL load as I increase firing angle from 90 deg to 180 deg, the output voltage should become more ...
saqib khalid's user avatar
1 vote
1 answer
49 views

Closed Loop Buck-Boost converter, no load condition

My question is how can I close the loop with no load condition of my buck-boost converter, by using peak limiting current mode control? Is the bleeder resistor needed or is it possible just to close ...
usernamenenad's user avatar
1 vote
1 answer
50 views

Average Model of Peak Current Mode Buck Converter

I am trying to understand average model of Buck Converter for Peak Current Mode Control Topology. Below is a snapshot taken from the Christophe Basso Webpage, from file “PWM Switch LTspice: Mark ...
Power Path's user avatar
0 votes
1 answer
51 views

Electric field in power transistors

I had a question about power transistors, why are small fields used in power transistors? I think this question could be because the voltage is high, but mostly in terms of the transistor structure I ...
Sajadi's user avatar
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1 vote
1 answer
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Why is the BQ25895 default system voltage 3.5V not 3.3V?

Why is the default system voltage 3.5V, not 3.3V even though, for example, the STM32 maximum voltage is 3.6V, but nominal is 3.3V? BQ25895 datasheet.
Oleksandr Valentirov's user avatar
0 votes
0 answers
38 views

Switching between two power sources and charging a battery pack

I am designing a circuit, which can use either the power from the normal socket (230V) to charge a battery pack and power a arduno uno R3 at the same time when a spst switch is on. When the switch is ...
Mario Gabriel Radu's user avatar
1 vote
3 answers
80 views

Resistor after voltage divider changing the maths?

I would like to get the correct voltage value after a voltage divider. In some way R7 is affecting the estimated voltage output value but I don't know how. My math, (Vout) calculated after R7: Vout = (...
johnnytolengo's user avatar
0 votes
1 answer
60 views

Peak Current Mode Control Buck Converter Slope Compensation Info From datasheet

I am working on Buck Converter design based on LT8642S controller and trying to do average modelling ,so I contacted manufacturer regarding slope compensation info and they responded below. "The ...
Power Path's user avatar
0 votes
1 answer
101 views

Buck Converter Peak Current Mode Control Average Model

I am trying to understand average model of Buck Converter for Peak Current Mode Control Topology. Below snapshot taken from Christophe Basso Webpage(https://powersimtof.com/Spice.htm) from file "...
Power Path's user avatar
2 votes
1 answer
85 views

Simulation problem in half bridge leg of an inverter

I am simulating Half Bridge Leg on an inverter. From the simulation, I could not understand why I was not getting proper dead time between high and low side fets. However, I set a delay time of 150ns ...
krunal patel's user avatar
0 votes
1 answer
123 views

What is the difference between a 225j 400V capacitor and a 105j 400V capacitor? [closed]

I am trying to build an AC to 12V 1A DC power supply.
MMNZ's user avatar
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