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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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MAX17205 battery pack fuel gauge configuration

I am working on the fuel gauge by MAX17205 for my project. https://www.maximintegrated.com/en/products/power/battery-management/MAX17205.html I am able to communicate with the chip using I2C protocol ...
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2answers
59 views

Poles of induction motor rotor

For a three phase squirrel cage induction motor (IM,) we can have 2 or 4 or 6 etc. pole pairs on its stator and when these stator windings are energized by 3 phase mains supply then we get a rotating ...
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2answers
35 views

Induction Motor Poles and Drive Configuration

If an IM is driven by a VVVF drive and the poles of the motor do not match with the drive configs.. eg., IM is 4 poles but the drive setting is 2 poles.. or the other way around.. then can it create a ...
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1answer
81 views

Why can't certain isolated DC/DC converters operate at over 50% duty cycle?

I am currently studying two switch isolated DC/DC converters, more specifically the Push-Pull, the Half-Bridge and the Full-Bridge DC/DC converters. Several books say that these converters cannot ...
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1answer
27 views

DQ Currents in the Induction Motor Model

While studying the Induction Motor modelling and also its Vector control using DQ currents decoupling method.. I am finding it hard to see which current is which on the model diagrams. Can anyone ...
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1answer
110 views

Torque-Speed Equation for Induction Motor

I am looking for the Torque-speed equation on an Induction Motor that is used to draw the curve.
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48 views

This is a basic question but I'm confused please help [duplicate]

I need to power my circuit. I have a power supply of 12v 8.5 amp my circuit needs 12v 1 amp. What do I need to do?
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1answer
85 views

Arduino 2 power source - auto switch?

I'm planning to switch between two power sources DC and USB with an Arduino like below diagram. What I'm going to do is cut off the DC V+ wire when I insert the USB jack to the Arduino for uploading ...
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2answers
112 views

DC 12 V to 2000 V circuit

I want to design a battery operated pest trap (electrocuter). So far I have found out that the electrocuter snaps the insect at about 2000 V when it completes the circuit by landing on 2 nearby wire-...
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1answer
93 views

Flyback discontinuous mode, double voltage over the switch

Considering the following simplified flyback schematic. Which has the following voltage current graphs Why is there 2*Vin over the switch when the switch is turned off? And why is that change to Vin ...
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27 views

Air core design

what is the appropriate air core design for inductive power transfer that is suitable for 30khz? I used 200 turns and 7 inches diameter.
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1answer
55 views

Is there a PCB coplanar edge connector made for high power transmission instead of data transmission? [closed]

Looking for a PCB-to-PCB coplanar edge connector that can carry ideally 40V and 30A.
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1answer
44 views

motor slip vs rotational speed

In Induction motor theory the term slip is used as normalized relative speed of the rotor to the synchronous speed and it depends on the physical rotational speed of the rotor. Is there any special ...
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41 views

What connector can be used for dimmer output?

I have some poorly designed PCB board (LED dimmer), through-hole mounting. The output is in the left corner, it have 8 x 0.1" pitch pin mounting holes for connecting line-in, power, and output (H,M,L,+...
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1answer
94 views

FOC sensor vs sensorless

I am trying to understand the hardware difference between the sensored and sensorless FOC 3-phase Induction Motor Drive circuit. So far what I understand is that FOC require following sensors: 1. ...
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1answer
114 views

What is the practical use of Laplace Transform?

I am trying to understand the electrical model of 3-phase Induction Model. The rotor of the motor is modeled as a variable resistor in s-domain. I fail to understand how that works practically. Can ...
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3answers
80 views

MOSFET for revrerse voltage protection

I have used the following circuit to for the purpose of reverse voltage protection. But, I am a little bit confuse about the working of the zener diode in combination of the 100k resistor in this ...
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2answers
67 views

Is there a dual row edge connector that is connected a the edge of the PCB, with one row connecting to top side, the other to bot side?

I do not want a card edge connector that sits on neither the top or bottom of the PCB, I need one that sits parallel to the PCB board.
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1answer
46 views

Installing Samsung electric range oven on 110V [closed]

I just purchased a Samsung electric range oven, NE59M4320SS. It has a connector cable, https://www.bestbuy.com/site/smart-choice-6-range-cord/8929671.p?skuId=8929671 As you can see the cord has 3-...
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3answers
140 views

Active (P), Reactive (Q, D) and Apparent (S) Power from Instantaneous Power (p)

I am having a difficultly with producing \$S, P, Q \$ and \$D\$ from Instantaneous Power \$p(t)\$. Let's say that both voltage and current are clear sine waves. Then: \$p(t) = Vsin(ωt+φ_V) \cdot ...
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3answers
132 views

Power of the Zener diode

In this circuit there are several things required like the inductor and diode current, and the average power of the inductor, but what does really puzzle me is how can calculate the zener average ...
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0answers
40 views

How to deduce the current function from the graph?

I want to express the current function based on the next graph So using the slope and the coordinates in the third interval the current will be \$i(t)=\begin{cases} 0\,A & 0\,s<t<t_{1}\,s\\ ...
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2answers
84 views

Why the led isn't glowing? [closed]

Why doesn't the led glow? I am trying to glow my LED For Making Project Of Detectore but it doesn't glow. When i connect this circuit with my full project that time LED Wasn't Glowing After I ...
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0answers
61 views

Discrepancy between simulation and measurement for a voltage doubler/ rectifier design at 5.8 GHz

I am designing a pretty straight-forward voltage doubler at 5.8 GHz with MACOM's MA4E1317 diode, which I have used before and know from previous experience that matches pretty well with the spice ...
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1answer
87 views

5 to 12 V boost converter not boosting

For my power electronics course, I need to design a basic boost converter that is converting 5 V to 12 V with 0.5 A output current. Below you can see the simulation results. MOSFET is driven by 20 kHz ...
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0answers
77 views

Commutation techniques in SCR

I read in a textbook that "Commutation Time is more in Current Commutation compared to Voltage Commutation".Kindly Elaborate.
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1answer
120 views

Majority Carrier Devices

Why majority carrier devices have higher ON state resistance compared to the ON state resistances of minority carrier devices?
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2answers
118 views

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
68 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
85 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
132 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
178 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
29 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
282 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
55 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
42 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
102 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
113 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
46 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
38 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
117 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
66 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
68 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
358 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
80 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
97 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
45 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
72 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
82 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 ...