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.

353 questions with no upvoted or accepted answers
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1answer
585 views

Safety Capacitor Selection

When selecting an X2 safety capacitor what must be taken into consideration. There are only a few types of capacitance ranges and seem to be chosen based on voltage rather than capacitance. Take ...
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3answers
3k views

Calculating the ESR of Capacitor

I try to calculate the ESR of a capacitor. I checked this datasheet: http://www.farnell.com/datasheets/2245214.pdf?_ga=2.167304311.817060034.1534770853-676261198.1531404202 I can see from the ...
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2answers
380 views

Clearance through pcb

I've become fairly familiar with the clearance and creepage requirements of UL/IEC/etc 60950, 60730 and derived/related standards. I've just realised, though, that they only refer to distances through ...
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0answers
29 views

Switching load with changing polarity

From a bespoke board I'm receiving 18vdc that I need to switch. This 18vdc will usually be +18vdc but at times can be -18vdc. The load is .35A. The polarity is being changed via a H-Bridge and ...
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0answers
69 views

2KW - 48V - 240v / 50Hz UPS - Unknown Topology

I am refurbishing a 2kw ups that a friend gave to me. It had failed and had been left in a shipping container on a site and the PCB had suffered some low level corrosion. The PCB is a 2 layer board, ...
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2answers
67 views

MOSFET pinchoff reduce current

I understand that in an n channel MOSFET as Vgs increases, electrons are attracted towards the gate forming an n channel. These electrons are responsible for the conduction of the MOSFET. As Vds ...
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0answers
66 views

Alternate uses for Gate Driver - Driving a Load without External IGBT or FET

What issues would one encounter by using a gate driver IC to directly drive a load instead of using it to drive transistors? For consideration would be the very affordable Infineon 2EDN752x series ...
3
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2answers
335 views

Why do I get high DC current in grid tied inverter output?

Edit: Added gating signal waveforms. Changed some of the graphs, I accidentally put a test circuit waveforms the first time. Current is not that high but offset is there and current is high for a ...
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0answers
48 views

Generating +65 V (positive) and -65 V (negative) voltages from two 12 V batteries using cheap step-up converters?

I need to power a 300 W class D amplifier with positive and negative 65 V. As I'm a do-it-yourself guy, I didn't know about positive and negative voltage and ordered a bunch of these normal step-up ...
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0answers
41 views

TRIAC driver circuit behavior when switching low current loads

I'm doing a project that involves switching different kinds of loads (edit: by that I mean loads that go from just a couple mA, up to 5A or so) using the usual TRIAC + opto-isolator combo (in my case, ...
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1answer
63 views

Powering buck converter using charged capacitor

Is it possible to design a buck converter using a charged capacitor to get regulated voltage output? When the capacitor voltage falls below some threshold value the inductor should be able to provide ...
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0answers
48 views

Switching between power sources with microcontroller

I need a way to switch a load(a high power LED) between two different power sources(50v and 100v) using a logic signal, quickly(<500us) and repeatably. I was going to use an n-channel high side ...
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0answers
87 views

Is my IIR implementation (in C) correct for this difference equation?

I recently started developing a digital regulator for a DCM boost (Digital regulator for DCM Boost - How does it relate to duty cycle?) And I've implemented the difference the following controller in ...
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0answers
52 views

Methods for increasing output power and efficiency of a ZVS flyback driver

I have built the following ZVS driver: I am using this circuit at a resonance frequency of 150kHz. My hope is to be able to modify this circuit for wireless power transmission. With that being said, ...
2
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1answer
33 views

Attenuators in Waveguides

Let's consider for instance a rectangular waveguide with TE01 mode. As shown here, a possible attenuator may be realized with a metal card placed so that it is tangential to the electric field. Here ...
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0answers
166 views

How to connect Electret Microphone module and OPAMP?

I am trying to build a circuit that gets electret microphone input and maps into 0-1V for utilizing in ADC. The microphone module suggests using such circuitry When I tried that circuit and talked ...
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0answers
57 views

Can a Capacitance Multiplier be used with high voltage outputs?

I am designing an SMPS which two output voltages of 5kV and 2.5kV. My transformer is split into four equal sections, each feeding a FB multiplier, connected in series to form the final voltages. ...
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0answers
77 views

Bipolar transistors that only connect via base to emitter

I am trying to understand how to use this configuration of the LTC2992 power measure IC and the only part I am confused with so far is the two transistors which I have circled. What I know so far ...
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0answers
109 views

How does a electropermanent magnet work?

I’m trying to wrap my head around electropermanent magnetism. I read this wonderful PhD Thesis by Ara Knaian as well as details the history of this concept as well as Kyle Gilpin, Ara Knaian, and ...
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0answers
275 views

2 Switch Forward Converter Volt-Sec/Charge Balance

I am attempting to design a 2 switch forward converter. I understand how to do the volt-sec balance and charge balance when the converter is as shown in the ideal 2 switch forward converter below. I ...
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0answers
95 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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0answers
63 views

How does a MOSFET conduct in saturation region?

It is a simple question but I could not find a straightforward answer. When a MOSFET enters saturation region, the channel length starts to decrease, and the channel width is the smallest near the ...
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0answers
310 views

What is happening to this vacuum tube?

I’m trying to repair a 63 year old record player. Opening it up, all of the electronics have aged badly, except for the drive motor, which is basic enough that it operates properly. I know enough ...
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1answer
423 views

Average current mode control compensation

This is the structure of average current mode control (source here). Please look at signal \$V_{com}\$ at the positive input of PWM modulator. For proper operation, in steady state the magnitude of ...
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1answer
218 views

Transformer Design Using AP Method and Construction

I am designing a transformer for a traction inverter using the AP method. 1) I have chosen a Metglas core with a saturation flux of 1.56 Tesla. I have chosen a operating flux density of 0.6 Tesla. ...
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0answers
338 views

Ceramic capacitor in High voltage DC link

In motor drive application the high voltage dc link between the rectifier and the inverter usually have: a bank of aluminium electrolytic capacitor a film capacitor near the inverter Is there a ...
2
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1answer
417 views

How to connect four different ground planes in the same PCB?

I am working on a project which uses the LTC4020 multi-chemistry battery charger from Linear Technology. The design includes a microcontroller ( NXP KL25Z) to provide additional outputs and ...
2
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1answer
1k views

Designing a DC 12V 80A Power Distribution PCB panel and heat sinking

Background I'm trying to build a small hobby grade ROV for an underwater robotics competition held at the university I'm studying. And I have used eight brushed dc motors each of which consumes 8A on ...
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0answers
59 views

Will adding a DC-DC converter affect how a modern car operates?

I'm thinking of adding a wireless charger to my car, and adding a Buck Converter to step down the 12V source to 5V for efficiency sake. However, I am worried about the emissions from the DC-DC ...
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1answer
34 views

Finding practical solutions for discharging and charging a capacitor

I am wondering can I charge and discharge a supercapacitor at the same time like a battery. I have 1.3V going into a 10F 2.7V capacitor in series with a 0.5 ohm resistor. I calculated it will take ...
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2answers
52 views

Understanding Buck Converters and Solar Panels

I have a solar panel rated at 5V 80mA and want to increase the output current significantly higher to around 500mA and decrease the voltage to either 3V or minimum of 2.7V, how can I go about this? I ...
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3answers
103 views

How to design low pass filter using Sallen-Key architecture?

I have hard time to design a 4th order low pass filter using Sallen-Key architecture with corner frequency 33kHz and overall DC gain of 0dB. I have f01 (normalized) =1, Q1= 0.541, fo2(normalized)=1 ...
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0answers
54 views

Calculating capacitor discharge time constant with dc source and constant current source

I have a 1.8V dc source with 40 ohms series resistance, which models a battery. In parallel, there is a 10uF capacitor. At t<0, the mosfet is off and there is no load delivered to the output, so ...
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1answer
66 views

State Space Average Model of Non-Ideal Buck Converter

I've been learning power electronics and am trying to design a dual-switch forward converter. One of the things I've been trying to do is derive the small-signal equivalent circuit of the non-ideal ...
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0answers
32 views

What is the value of this shunt resistor from a drone power distribution board?

What is the value of the shunt resistor shown below? It is from the drone power distribution board, rated for up to 120 A. I am guessing, that the value is 0.25 mOhm. However, even with this value, at ...
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0answers
41 views

Inverter EMI filter design

I'm designing an inverter with a switching frequency range of 10-40kHz. The inverter will run off of a DC power supply at a relatively low voltage (30-80VDC) and low power (~100W) for motor control ...
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2answers
62 views

Transformer Secondary Discontinuity

I am using a step up transformer and I am getting a weird discontinuity in the secondary output. Has anyone seen anything like this before? I cant figure out what might cause this. In a one test setup ...
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0answers
25 views

Currents injected in the grid, connecting a wind turbine

I'm studying the connection to the grid of a wind turbine through a three-phase inverter. Now I understand that , in normal operating conditions, in the connection to the grid, the reference for id ...
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1answer
58 views

How to effectively avoid current drops while stepping down the voltage?

We are using a PC power supply to power our project, which is a Robotic arm. Since our power supply has a 12V output voltage, can anyone please advise how to step down the voltage (12V) to 6V. Using ...
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0answers
27 views

Practical Issues with Surface Mount Heatsinks?

I'm considering using surface mount heat sinks for D2PAK devices on a PCB. These heat sinks are bent sheet metal frames with tin/lead plating in tape/reel packaging which are suitable for soldering ...
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0answers
50 views

PWM for three phase induction motor control

I have been implementing control software which shall control the three phase voltage source inverter for controlling the induction motor. There are two requirements as far as the pulse width ...
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1answer
51 views

Need help with power supply in my project

I am a mechanical engineer. I need some help with my project I am building a water sampling device that has 11 solenoid valves and a vacuum pump to distribute water to various containers on the device....
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3answers
50 views

what is causing this ring effect on my MOSFET testing circuit and how would I be able to calculate the MOSFET power losses?

So I have the following circuit This is the data sheet for the MOSFET enter link description here Using equations, I worked out what my Rgate to be 2.36 ohms. where Rtest was a 470ohm ceramic block ...
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1answer
47 views

what is the importance of input and output impedance of a RL low pass filter?

I read from the book that for a good voltage coupling, the input impedance must be larger than the output impedance of the previous stage, which requires a min value of Zin since the frequency of the ...
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0answers
43 views

How to charge multiple 3.7V LiPo batteries in parallel?

let's say I have 4x 3.7V LiPo batteries connected parallel. I want to use TP4056 charger boards to charge them. (see picture) As a power supply, I use a 5V 15A adapter, so there is plenty of power ...
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0answers
36 views

Can anyone properly explain me the characteristic curve of the p-type JFET?

I know how a MOSFET works. But recently I wanted to know details about JFET. When V(GS) = 0 volts there will obviously a current flowing through the p-type channel. What confuses me is how the ...
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0answers
46 views

How exactly does a matrix converter work? Is this even a question that could be answered without months of study?

I learned a while ago about the matrix converter, a type of power electronic device that, I'm told, does direct AC-to-AC conversion without an intermediate DC step. I'm told it can convert input AC ...
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1answer
92 views

Flyback converter can't power load

I'm working on a Nixie tube clock and I'm having issues with the power supply. It's a flyback converter based on the LT3757 and the Coilcraft DA2032-AL flyback transformer. I designed to work with an ...
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0answers
20 views

Non-ideal inductor effect on inductor current in a quadratic boost converter

I'm studying a quadratic boost converter and I'm expecting to see in the lab a constant current in the inductors, with a small ripple associated with energy exchanges between the capacitive and ...
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0answers
26 views

Does transformer line side voltage varies with backup generator on load side running at from 0 to 100%?

We have a transformer of 750 KVA with 5.75% impedance. On the load side we have loads and a back-up emergency generator. This emergency generator is capable of supplying the loads and still export ...

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