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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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PID vs Bang-Bang - which one is more stressing on components?

This question is regarding a 3D printer, specifically its heat bed. The head bed is a PCB heater with a resistance of 0.9 Ohms, so it's drawing around 13 Amps when supplied with 12 Volts. I recently ...
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1answer
67 views

How is calculated the average current?

I was given a problem, the conditions are: The voltage and current for a device (using the passive sign convention) are periodic functions with \$T=100 ms\$ described by \$v(t)=\begin{cases} ...
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1answer
76 views

How to connect the power planes of 2 PCBs with the least stray inductance?

By the nature of my project, I am designing 2 power electronic boards that are supposed to have its high power main voltage and ground plane connected together. Can you recommend a type of connector ...
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1answer
71 views

3.7V Li-Ion battery powered LED step-up/boost driver

Most quality COB LEDs are driven with around 35V. Are there any quality constant current step-up drivers available that allow a 3.7V Li-Ion battery to be used? Or would I have to use TI's WEBENCH ...
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2answers
162 views

In SMPS , why does peak current mode control have lower gain for inner loop compared to average current mode control?

This has been bothering me for a while. In some of the design notes of power management ICs , it is mentioned that peak current mode control has 'lower gain - wider bandwidth' inner loop compared ...
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0answers
24 views

IGBT Power Calculation in motor control application

My DC motor's nameplate says: VOLTS: 125 AMPS: 27A HP: 4 HP RPM: 5000 RPM DUTY: CONT. I chose this IGBT IKW50N60DTP to drive the motor with a PWM frequency of 5 kHz using a single-quadrant ...
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1answer
164 views

AC MOSFET switching without any diodes? [Low-Cost AC Solid-State Relay With MOSFETs]

Is it possible to switch an AC load using two MOSFETs in anti-series such as the picture below? In this mode, each MOSFET is on during one half of the wave and the other's body diode conducts to ...
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3answers
48 views

Bipolar transistor. Unknown graphs

I read a course about power transistors and I encountered these graphs The chapter is talking about safe operation of BJT. Can anyone tell me what those graphs are ? (And how to read them).
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1answer
39 views

Why on shutdown the SCR can be compared to a power diode?

I have this as a homework question and can't seem to find the answer in my notes, book or internet. I know they will behave similarly when there is a reverse polarity on both, but the way my professor ...
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3answers
80 views

Design of synchronous buck converter: What's “ripple voltage”?

I am designing a synchronous buck converter for variable input from 12 to 36 V and output fixed at 14.4 V. The power is 400 W and switching frequency is 50 kHz. While designing I came across 2 terms. ...
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1answer
71 views

DC link capacitor for induction motor drive

I am simulating FOC drive for a 5kW,400V, 50Hz 3-phase induction motor. The drive algorithm worked fine when inverter was fed from proper DC source of suitable value. However, in practice, the drive ...
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1answer
39 views

Half wave rectifier input voltage and current waveforms

ok so i am having a problem in power electronics in my book there is a circuit for a single phase half wave rectifier as shown below and also its related waveforms and then its performance ...
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1answer
33 views

0-5 to 0-12 volt level shifter at high frequency

what is the best way to shift PWM at 500kHZ from logic level 0-5 volt to 0-12 volt to drive a mosfet? answers here were no good they only work for lower frequency and pwm is distorted at 500kHZ ...
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1answer
53 views

Voltage controlled versus current controlled Inverter

I would like to ask about the voltage and current controlled inverters. In a current controlled inverter, the control target is the output current and they provide high quality current to the grid. ...
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3answers
59 views

How to turn on high-side MOSFET of a buck converter

I'm trying to simulate some buck converters with real MOSFETs instead of ideal switches. The problem is that I don't know exactly how to properly turn on the transistor. The simple buck converter ...
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1answer
57 views

Determining Battery Charging and Discharging Rate Based on Max Current and Nominal Voltage

I am having difficulty in figuring out some basic stuff and confused with multiple equations. I am working on a simulator which simulate a hybrid vehicle journey for some period of time. During ...
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1answer
216 views

What are the advantages/disavantages on using CCM or DCM in boost converter? [closed]

When should we choose continuous conduction mode (or discontinuous) when designing a boost converter?
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1answer
70 views

Power issue on connecting controller to FTDI programmer

Hi, I have connected my controller (ATMEGA2560) input to 5V power supply. At the VCC terminal 5V is shown. The VCC, TX,RX, RESET and GND pins are connected to a FTDI programmer port as shown in figure....
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2answers
59 views

How to maintain a stable voltage on a Wind Turbine for Inverter

I'm doing some experiments on a wind turbine in my spare time. At the moment, my system runs well and I can measure good output values from my generator. For example: 38V @18Hz at 30 RPM 97V @37Hz ...
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1answer
31 views

How could i calculate the voltage induced in a detector circuit by picking up RF signals from a Mobile phone?

Is there any formula/equation i could use to estimate the voltage induced at the input from the RF signals?
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1answer
69 views

What resistor type is best suited to constantly dissipate 10W?

I am trying to decide on the best resistor type for a 50V system with ~470 Ohm resistance. This resistor will constantly be dissipating power. Is a wirewound resistor the right choice? Should I be ...
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1answer
73 views

Transistor Video Amp Circuit Help

I built the below video amp & it worked nicely.But it is One in One out video amp. http://www.learningelectronics.net/circuits/video-amplifier.html Now I want One in TWO out Video distributor.I ...
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1answer
77 views

Why does my power diode have 4 terminals?

I am using a high voltage diode (APTDF400U120G) to freewheel an inductor in a switching circuit. It has four terminals, two for either side of the diode. I cannot figure out why this is. If I only ...
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2answers
48 views

do I have to separate grounds when using opto-coupler in boost converter?

I have a DC-DC boost converter: where the mosfet is driven by PWM signal generated with a PIC18F4550. However, the PWM isn't directly feed in the mosfet. It passes through an opto-coupler first. ...
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1answer
66 views

Strange component with marking SE-B3

I salvaged both of these parts and the one in the left has a schematic symbol that I've never seen before. I have spent hours trying to look up, but don't know what it is. The markings on it look like ...
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1answer
23 views

Understanding Undervoltage in LTC2965 - 100V Micropower Single Voltage Monitor?

The undervoltage specifications for this IC is a bit confusing to me as this is the first time I'm working with these kind of circuits. Aim : I want to monitor the voltage of a battery pack (...
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1answer
28 views

Unable to supply FONA 32u4 3.5 v through circuit

I am relatively inexperienced when it comes to circuitry and electronics. However I am trying to create a simple device in which with a press of a button, the device turns on and calls a specific ...
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2answers
185 views

Why sometimes some PCB designer add extra traces to connect two pin to each other?

I've checked a PCB board which has designed by very famous company and I saw something weird.They connected two pin to each other 2 times and from the top and the bottom of the board I am going to ...
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1answer
62 views

what is the German/Austrian nomenclature(Voltage and current direction) in electronic circuit?

AS I came from a country where we use the french system in defining the voltage current arrows in electronic circuit, I am confused about the German/Austrian system where I see the voltage arrow is ...
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2answers
82 views

How to deal with “peaks” voltages in mosfet in boost converter?

I'm designing a Boost Converter to go from 5 [V] to 12 [V]. The design I came with is the following: To understand better the design, please note the following: 1) To drive the mosfet I'm using a ...
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1answer
59 views

Difference series resonant and LLC DC/DC converter

What is the exact difference between a series LC resonant converter and an LLC converter. From a topological perspective, they seem to be exactly the same. I believe that for an LLC, also the ...
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1answer
95 views

Can i use an AC 15A 250V / 30A 125V rocker in place of a 15A 125V / 10A 250V one?

Amazon sent me the wrong replacement switch so i am wondering if i can use it? Original switch is AC 15A 125V / 10A 250V new one is AC 15A 250V / 30A 125V can i use it without damaging the ...
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15 views

Derive an expression for the current of a RLE rectifier

I'm trying to calculate an expression for this RLE rectifier: simulate this circuit – Schematic created using CircuitLab With \$R=2 \Omega\$ \$L=20 mH\$ \$V_{DC}=100 V\$ \$V_{m}=120 V\$ \$...
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1answer
39 views

How does the transistor topology look like for a gate of this logic inverter?

How does a single inverter gate of this hex inverter, look like in transistor level? I don't mean the actual photo, but how does the transistor topology look like? Does the BJT inverter (see below),...
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0answers
136 views

Overvoltage protection circuitry choice

I need to design a input overvoltage protection for a 45W DC-DC converter rated for a 9-24V wall wart input (so, 45W / 9V = 5A input current at max). So far I've seen two approaches (schematics below):...
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2answers
212 views

High-side vs low-side reverse polarity protection

I need to make a reverse polarity and over-voltage protection for a fairly powerful device (45W @ 12V input) and after some research I noticed a weird peculiarity. A typical reverse polarity ...
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1answer
51 views

how to design AC line filter for VFD?

I am working on VFD for single phase induction motor. I am rectifying AC 220V directly to DC link capacitor. There is no LC filter from AC mains. There are harmonics in the AC mains. Can you suggest ...
4
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2answers
178 views

Flyback Converter Capacitor Value selection with given ripple voltage limit

I need to design a flyback converter for my project. In my design the output voltage is 15 V. I calculated all the parameters including inductance values, diodes selection etc. However there is a ...
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2answers
117 views

Short-circuiting the primary coil of a transformer to keep it warm

I saw this problem somewhere and I wanted to give it a try, but the numbers I've got seem to be pretty outlying. We have a 25kV / 4160V transformer which is out of circuit for now. To protect it ...
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1answer
88 views

How can charging current be understood intuitively?

The charging current I’m talking about would be the one between un-shorted phases and ground when there is a short to ground in one of the phases in a distribution network or facility. I'm not talking ...
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2answers
41 views

How do the areas of the emitter, base and collector affect their respective currents?

I want to know what will be the effect on current if we change(increase or decrease) the area of the emitter, base, and collector. For example, if we double the emitter area what will be the effect on ...
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1answer
54 views

Inductor power choke

I'm looking for this inductor 10 µH. Need help to recognize series model of this IC's inductor.
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1answer
41 views

What happens to the low cut off frequency when replaced with a larger bypass capacitor?

When the emitter capacitance is increased to 100 microfarads. What would happen to the low frequency cut off of this amplifier?
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1answer
38 views

4.5µA Li-Ion Battery Protection Circuit

I tried to simulate the circuit given in your design note "https://www.analog.com/en/technical-articles/battery-protection-circuit.html" According to the designer, the cut off voltage is 3V but the ...
3
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1answer
126 views

What could cause the mosfet to burn out in my motor driver?

Here's the schematic: I've tried to make this motor driver as tough as possible, but I'm still seeing occasional failures where the MOSFET and the diode D1 are both failed short. Any ideas what ...
2
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1answer
167 views

Fourier Series Expansion of the phase current of a three phase full wave bridge rectifier

I am really struggling with this homework problem where I am asked to calculate the harmonic components as a ratio of the first fundamental harmonic of the phase current of a three phase rectifier ...
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1answer
38 views

Power converters Modelling - NPC versus no NPC

I am trying to simulate a three-phase inverter in Matlab/Simulink. So far I figured out that in the Simulink library there are two types of inverters. The first one is illustrated in the figure below ...
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1answer
51 views

Energy loss by Hysteresis

I recently did an experiment aiming to verify the magnetization curve of the cores of a single-phase electrical transformer. I applied a sine within one core and I observed this one and the other one ...
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0answers
61 views

High frequency switching applications

I was reading that for high frequency switching applications with semiconductors, the ratio of the electron to hole mobility should be high. Why is it so? Is it a necessary condition always? Or ...
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2answers
35 views

Bjt for trigger MOSFET

I my project MOSFET need 13 v 65% PWM to trigger but controller output is 5 volt then how can I amplify this in voltage