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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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57 views

how rubber keypad works [closed]

Press on the keyboard, how does he connect the circuit of this key? Two thin films, coated with conductive rubber circuit, with a thin film in the middle, with holes, used to isolate two thin films ...
0
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2answers
116 views

Virtual Short Concept in an Op-Amp

By virtue of the open-loop gain being infinity for an ideal op-amp, the two input terminals are said to be virtually shorted. Yet, the virtual short concept is only applied to op-amps in negative ...
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3answers
174 views

Is this a selenium rectifier?

The item below is one of two components of an old (c 1950?) electric chisel. (The other part is a reciprocating solenoid.) The name tag on this part says "Electric Converter", with a 6 amp rating. ...
3
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1answer
72 views

Problem while simulating EMI Filter for power lines

I was designing an EMI Filter for the CE102 standard. I was a bit confused on how to provide noise source to the circuit, since (as of my knowledge) EMI noise enters our system by parasitic ...
0
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1answer
35 views

Enhancement type MOSFET - channel formation

In an enhancement type MOSFET (an n channel one assumed here), when a positive gate to source voltage is applied, the holes of the substrate near the gate move deeper into the substrate away from the ...
0
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1answer
43 views

Question on MOSFET - small signal model

In the small signal model of a MOSFET, the current from the drain to the source (for an n channel MOSFET) is a function of the gate to source voltage only. But, if a positive voltage was not applied ...
0
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2answers
65 views

Rectifier, Flyback vs Transformer, Rectifier, Buck

I've just finished doing my first off-line flyback, which proved a success. A simple block diagram is as follows: I know this topology seems common now, for example it is used in Apple USB Charger ...
1
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1answer
79 views

Placement of feedback line on DC DC converter, before or after cap? (and dropout problem with LT8390)

I am using an LT8390 DC to DC converter, I have a highly inductive load and it is causing dips. The dips are shown here (and about a 6V drop for 7ms): I need to get rid of the dips, which I will ...
0
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1answer
53 views

Why the voltage suddenly reduces when thyristors change from forward blocking to conduction mode

As per the diagram: v-I characteristics of SCR is a graph of anode current I A on y-axis & anode to cathode Voltage plotted on x-axis v-I characteristics can be split into two parts namely ...
0
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1answer
24 views

Can a DFIG operate in a synchronous speed?

A DFIG can operate in both sub and super synchronous modes. Can a DFIG also operate (stable) in a synchronous speed? If so, would the rotor current (as decided by IGBT switching) be DC since the rotor ...
0
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1answer
45 views

Reactive Power in grid side converter for Doubly fed induction generator

Does the grid side converter in a DFIG absorb/provide reactive power or is it reactive neutral? Also, what can we say about reactive power exchange in the rotor side converter?
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1answer
46 views

How to wire together 3 power supplies for 3 different pd rails with the same reference 0v

How would I wire together 3 bench power supplies to get potential differences of +12, +24 and -6V, all with respect to the same 0V? All 3 of the bench power supplies have positive, negative and ground ...
1
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1answer
70 views

Power Switching using MOSFET and opamp

I'm trying to understand the Arduino design. LM358 and FDN306P is connected in between USB input and primary source input. In presence of USB and primary supply the Arduino mega board is drawing ...
2
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2answers
107 views

Feed-forward capacitor in SMPS feedback

I was looking at the TPS63700 DC-DC inverter datasheet and stumbled across the schematic below. It is a more or less usual buck-boost inverter topology schematic, except for the weird R4 and C3 ...
1
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1answer
43 views

Is there an industry-wide name for anti-parallel diodes across an IGBT module's collector and emitter?

For example, this datasheet refers to a 'freewheeling' diode and a 'boost' diode. The upper diode is the freewheeling diode, right? If you wanted to switch an inductive load with a single such module,...
2
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1answer
132 views

Zeta topology DC-DC converter unstable

So I've tried to build a Zeta topology DC-DC converter based on a simple buck converter IC XL4016, which works perfectly in a regular buck topology. However, when hooked up in a Zeta topology as shown ...
1
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1answer
42 views

Do thermal cutoffs exist that would work with a line that is 40-75V 0.5A and a max temp of ~85°C?

I have a bunch of COB LEDs that I am going to wire in series using an LED driver. The driver gives off between 40-75V and 0.5A max. The circuit should run around 70V and 0.5A. Due to space ...
0
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1answer
205 views

Problem with IR2112 on Proteus

I am designing a pure sine wave innverter and am using IR2110 as a driver for the H-bridge. On protues however only IR2112 is available so i used it. I managed to get all the connections in a correct ...
3
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1answer
122 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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0answers
54 views

Problem opening a PLECS blockset in MATLAB

A friend of mine sent his simulation of a converter for which he had used PLECS. It is in the format "example.slx". I have MATLAB R2017b. I downloaded the PLECS block set for MATLAB and activated it ...
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2answers
87 views

Do electronic devices require more current when alkaline batteries goes low?

I know that alkaline batteries' voltages go down when they're at low charge (from 1.5V~1.7V to 1.0V). For typical electronic devices like remote controls or bluetooth mouses/keyboards (that uses two ...
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2answers
95 views

Why is my oscilloscope reading jittering, and how might I fix it?

I've made a simple inverter circuit and I've read the voltage across the load resistor using a RIGOL DS1104 oscilloscope. Here is the link to the screen capture. I'm using a full-bridge inverter ...
0
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1answer
380 views

How much current does an 1602 LCD draw? [closed]

I want to know how much current a 16x2 (1602) LCD draws when the backlight is OFF and ON? NB: My multimeter is broken.
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1answer
89 views

Need help to newbie to understand MIL-STD-461 [closed]

why only 10khz-10Mhz is used for CE102 test ? why not other frequency range is used for CE102 test ?
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1answer
160 views

Controlling the Spark plug using 555 IC

I built the circuit for ignition system using MOSFET, 555, ignition coil(specs unknown. But current rating is more than 2 A and less than 10 A), SMPS(12 V, 10 A for powering the the whole circuit). ...
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1answer
124 views

How were Power Bank limits decided by airlines?

Why is a 160Wh power bank considered safe to carry on board, but not 170Wh, for example? What defines this maximum safety limit, how was it determined? Obviously airlines across the globe have agreed ...
2
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3answers
333 views

What is the technical name for fan that produces electricity?

I'm wanting to create a wind powered LED similar to this one, but weather proof. I know there's tons of them out there, but I'm wanting to build it from scratch. My issue is that I'm completely ...
0
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1answer
52 views

RS485 Functionality difference

I would like to major difference between these ICS. Max 485 Low power Slew rate limited SN75176 :Differential Bus Transceiver ADM 2483 Differential Bus Transceiver ADM 2483 is Isolated type power ...
2
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0answers
54 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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3answers
102 views

Triac Dimmer Supplying a Purely Inductive load

I was asked a question in my lab viva today, on a triac switch supplying a fixed value inductor of 0.2 henry. How will the current and voltage of the inductor vary, if the triac's firing angle was ...
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0answers
31 views

DC DC converter opamp compensation

I have simple doubt. I am making a closed loop DC DC converter flyback, I am using opamp for compensation. It should be a single input single output network. Input voltage is 24-32 volt, output is 5V ,...
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3answers
212 views

Wireless power transfer - Inductive vs. resonant mode

When talking about how wireless power transfer is done, the standards (e.g Qi) distinguish between inductive and resonant mode. (Link) They claim that when the units are in very close proximity it is ...
3
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4answers
209 views

Burning a Power MOSFET

We are doing battery heat testing and want to be able to vary the current in the circuit to different test points up to 100A. Our circuit schematic is attached. The MOSFET is IXFN360N10T. We attached ...
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1answer
85 views

DC choppers output voltage in ccm and dcm mode with no load

I was wondering what would happen to the steady state output voltages and currents of the Buck, Boost and the Buck-Boost converters, working in 1 - Continuous conduction mode (CCM), 2 - ...
0
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1answer
69 views

How to increase low voltages modified AC Sine wave up to 220 VAC with 0.25 Watt?

I am working on Multilevel Inverter and successfully achieved modified sine wave with 7 level, that is much better according to my requirement. But the problem is output AC voltages is too low which ...
2
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3answers
109 views

Can someone please help me with these questions on DC Chopper Circuits?

I had a quiz on power electronics and the following questions were asked: Question 1: Consider the buck chopper in Figure 1, operating at 100 kHz frequency, with the switch duty ratio of 0.5 and ...
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0answers
37 views

Design methodology - Single-Phase vs Three-Phase Inverter

I simulated a small DC Microgrid in Matlab/Simulink. In order to connect the DC bus of the microgrid to the AC grid, I used a three-phase - two-level inverter. I have done some research and I found ...
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3answers
259 views

How to power long (30 ft) nichrome wire from 120v AC wall socket

I am working on making a vacuum forming machine, and I need to power a significant length of nichrome wire off of a 120v AC wall socket. I have very little experience in electronics, but I have talked ...
0
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1answer
43 views

How deep does the depletion region in power diode penetrate the lightly doped n- layer under no bias?

I could find references for describing the depletion layer in a power diode under reverse bias and the consequent classification of Non-punch through and Punch-through diodes. But I couldn't find a ...
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1answer
616 views

Why do power diodes have a p+ n- n+ construction and why not p+ p- n+?

I've been learning about power diodes and how they differ from low power diodes with the addition of a lightly doped n-type layer. This n-type layer improves the breakdown voltage rating of the ...
0
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1answer
40 views

Ic and Vce equations of IGBT

I know in IGBTs while operating, parameters Ic (collector current) and Vce (collector-emitter voltage) are Tj (junction temperature) and Vge (gate-emitter voltage) dependent. Is there anything else ...
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1answer
40 views

Calculation of Vce from Ic-Vge Characteristic

We have found the Ic-Vge (collector current vs gate-emitter voltage) characteristic of an IGBT device as shown below at a high Vce (collector-emitter voltage) value (here 20V) from the datasheet (...
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1answer
103 views

How can I boost 1 Volts 30 Ampere input to 5V with maximum Current limit of 5A?

How can I boost 1 Volt 30 Ampere DC input to 5V DC with a maximum Current limit of 5A?
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1answer
63 views

Reactive power compensation through grid connected inverter

I recently designed a bidirectional DC-DC charger for an Electric Vehicle (EV) battery. I would like to focus on the inverter control. In this application, I designed the inverter to have unitary ...
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2answers
522 views

Is it safe to make a dual supply out of two wall adapters?

I am trying to design a guitar distortion pedal circuit and I need +9 / -9 V dual supply in my application. I have two 9 V adapters: https://www.phihong.com/assets/pdf/PSM03A-XXX.pdf Would ...
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1answer
65 views

How to prevent a low duty cycle load from flickering lights

This is a follow up question to this: Alternatives to Large Transformer or PSU for Driving DC Heater I've hooked up 120v AC to a zero crossing SSR and a 3.2 ohm resistive load. To get my desired ...
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0answers
183 views

IGBT failure and protection

I have a 3-phase bridge rectifier (shown below). I am using an IGBT (STGE200NB60S) to limit the inrush current from the capacitors at start up. I also added the NTC thermisters to help with the inrush ...
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3answers
116 views

I am trying to build a 0-42v Voltage measuring circuit that outputs to a 5v Micro! Failing badly

I am on to my next project which doesn't seem to be working as planned. At first I thought that I would find a boatload of pages on how to do this, but to my absolute surprise I couldn't find anything ...
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1answer
47 views

What kind of PMIC is this?

I found this circuit in a schematic I'm reviewing, which supposedly provides a regulated +5 V supply. The primary side of the transformer includes a flyback controller that switches ~340 VDC on the ...
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2answers
61 views

How does flyback converter with two MOSFETs work?

This is the schematic. Both switches are in phase (On and Off at the same times). When both SW are On, current flows through primary transformer coil, entering from the top side of it, and leaving ...