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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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2
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2answers
164 views

High-side driver IC use of diode in the npn transistor BE

I would like to know why is used a diode between the BE of the npn in this circuit. The npn is used to boost the current to deliver to M2 gate in this bootstrap circuit. Is it maybe needed to get rid ...
2
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3answers
393 views

Parametric stabilizer circuit optimization for reducing ripple

We have a TV mainboard that will be used in cars. The input voltage will have lots of noise and not be regulated well. So we want to use a parametric stabilizer at the 12V input. Acumulator voltage ...
2
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2answers
606 views

thyristor equation

I know how does an I-V curve of a thyristor look like, but is there any thyristor equation that can represent the curve?
2
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1answer
185 views

Which type of amplifier has feedback? BJT, FET or both

The answer to this question is given in the picture shared but I am not able to understand the answer or rather I would prefer to say I do not agree to the answer given. So I need to know what will be ...
2
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1answer
3k views

How to calculate the dead time to incorporate in the complementay PWM input to an H-Bridge designed using MOSFETs?

I am working on making an autonomous robot. Right now, I am involved in designing an H-Bridge using discrete components for my robot. I am almost done with the H-Bridge design, and want to test it ...
2
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1answer
2k views

What is the rectifier's role in this AC dimmer circuit?

Here is a typical AC dimmer circuit: http://www.eleccircuit.com/wp-content/uploads/2010/09/light-ac-dimmer-120watt.jpg I just came across another variant which uses a rectifier: http://www....
2
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1answer
148 views

Is BJT amplifier a viable option if the design needs to be replicated without calibration?

||Sorry for messing this up the first time. This is my first post ever in a technical forum. Need to pick up the ways of the crowd. Thanks for all the feedback and help. Well appreciated|| I intend ...
2
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1answer
2k views

wiring AC switch with DC led

This is a follow up to a previous question I had answered. I'd like to show the following diagram. Here, I have laid out (crudely) a diagram that has 120v-110vAC from the wall going to a push button ...
2
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1answer
358 views

Inverting buck-boost converter

I'm not really sure why an inverting buck-boost might be disadvantageous compared to a non-inverting converter. If the load has a particular polarity, then can't you just connect it backwards to ...
2
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1answer
346 views

How can I prototype an Aluminum-clad board?

I have a fairly thermal-heavy design that I want to prototype on something resembling an aluminum-clad (or -core) board. Alas, it's not FR-4 and the low-volume run costs are exorbitant. What is a ...
2
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1answer
171 views

Unstable 96V DC to 3.3V Supply

So I've got a huge battery at 96VDC with a couple of electric motors hooked up to it that can draw huge amounts of current -- up to 600 amps. I need to power a few small electronics for a data ...
2
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1answer
212 views

Why does a battery starts working on rubbing?

Whenever my TV remote or wireless keyboard/mouse stops working,I take the batteries out and rub the two terminals with some rough cloth and it works fine.I've observed that this works a lot of times(...
2
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1answer
75 views

Why don't we worry about reverse recovery voltage and current of a diode in a simple circuit application?

When the diode goes into reverse recovery, why don't we worry about the power supply in that specific time since the current will be increased? Will it not damage the power supply or is it since it is ...
2
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1answer
58 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 ...
2
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3answers
302 views

Does Thyristor (SCR ) works for Inrush current protection?

Does a SCR ie Thyristor work for Inrush current protection in a circuit ?
2
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1answer
122 views

Lossless Resistor model in PSpice?

Is it possible to make a lossless resistor model in spice? I want to test the large signal model of my DCM SEPIC converter (without linearizing it). OrCad's PSpice library doesn't seem to have it, but ...
2
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1answer
157 views

Transformer rectifier set. A question about the schematic diagram

This is a high voltage transformer (53kV) and rectifier that is used to power an Electrostatic Precipitator. The schematic shows a jumper between terminals H1 and H2 with a label "Remove jumper for ...
2
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4answers
742 views

How to implement mutually coupled inductor in SimuLink

I want to make a mutually coupled boost converter but I could not find any mutually coupled inductor block in MATLAB SimuLink. Please help, thanks in advance
2
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2answers
1k views

Junction to board thermal resistance

The Junction-to-case (bottom) thermal resistance of the TPS7A4701 LDO regulator is 1.7 °C/W. It is explained in the TI's app note "Semiconductor and IC package thermal metrics" that this metric refers ...
2
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1answer
2k views

freewheeling diode needed?

For a BLDC driver I`m using this Mosfet: http://www.farnell.com/datasheets/526719.pdf?_ga=1.38505579.956125949.1445440291 on page 6 there are some diode data. Is this diode enough for my application? ...
2
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1answer
101 views

Calculating Op Amp gain with voltage divider

Is there a gain differences between schematic 1 and 2? For schematic 1, the gain would be $$-\frac{R2}{R1} = -\frac{100k}{1m} = -0.1$$ But what about the schematic 2? Schematic 1: simulate this ...
2
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4answers
2k views

Driving a fan using a mosfet, do I need a diode?

I am using this BS170 MOSFET to drive a fan using a pwm signal generated by a 3.3V MCU according to the following schematics: (I know about the wrong symbol it's just for the packaging on the PCB) ...
2
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2answers
2k views

AC Motor flyback diode

Both AC and DC motor are inductors, and flyback diodes are used to dissipate residual current when power is disconnected from the motor. Flyback diodes are always present in DC motors, do you need a ...
2
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2answers
376 views

What is the name of this DC-DC converter topology?

I spotted a circuit in the wild that generates symmetric (e.g. ±8 V) analog power rails from a single +5 V supply using a single boost converter and a single 10 μH inductor. This is a very ...
2
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1answer
2k views

BTA16 absolute maximum amperage at 220/240V 50hz and impact of snubbers on resistive loads?

Using a BTA16 600CW3 triac with the arduino uno with the following schematic. Can it derive a 1.5 ton Air Conditioner and what is the absolute maximum amperage and power it can handle safely at 220/...
2
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1answer
217 views

What does 'g' in switching converter input voltage \$V_g\$ stand for?

I'm studying switching converters and the input voltage of a Buck, Boost, or whatever is designated as \$V_g\$. I've racked my brain (and also searched Google), but I can't work out what the 'g' could ...
2
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2answers
366 views

Low power chopper and power inverter

I'm seeking advice for components I could use in my lab course. My goal is that my students understand experimentally the ideas (circuit as simple as possible) behind a chopper device and a power ...
2
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1answer
191 views

Design considerations for a high voltage boost converter?

I'm trying to figure out the best method to get around 200V @ 15mA from a LiPo battery, and had a few questions. Should I be converting down to some voltage (eg. my microcontroller supply rail) with ...
2
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1answer
826 views

Better to regulate voltage by supplying or subtracting base current to BJT pass transistor?

As a learning exercise, I'm designing new guts for one of my venerable HP 721A (circa 1959) DC bench power supplies. With help from members of this site I was able to vastly improve the reference ...
2
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1answer
653 views

Question regarding a resistor in optocoupler/TRIAC circuit

I'm building a ac motor starter with a optocoupler (FOD4218) and a TRIAC (BTA16), one for each phase in a three phase 400V system. I have a question regarding the circuits that can be found all over ...
2
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1answer
160 views

First steps in building Switching power supplies

I want to make a 50Amps switching power supply, I have already done 10A linear ones succesfully This time it has to be a switching power supply one so, any ideas or tips of where to start are ...
2
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3answers
848 views

Galvanic Isolation with Voltage Equalization?

I need to equalize the ground voltage between the input and output of an isolated DC-DC power supply while still maintaining galvanic isolation. Is there a way to do this? The reason I need this is ...
2
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2answers
3k views

Why my full-wave bridge type diode rectifier circuit begins an analysis from 8. second on Matlab Simulink?

Hi, I am working on Matlab Simulink's work page to get full-wave and half-wave bridge-type-diode rectifiers as could be seen in the picture. But, according to my Scope2 screen when I double clicked ...
2
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1answer
47 views

Filter before or after switching regulator?

I will be passing a power line (12V-60Vdc depending on the circumstance) with a lot of noise, 300Hz and above, riding on it through a buck regulator. I want to remove this noise with a filter. I don't ...
2
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1answer
71 views

1500-6000V linear regulator (noise eater)

Is there any known approaches to regulate HV in the range of 1500-6000V in order to eat noise? Low-side regulation is a possibility. The idea is to get ~100V higher voltage than needed, and then ...
2
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1answer
54 views

Quarter-wave impedance transformer working principle

consider the following scheme: A transmission line of length lambda/4 has been put before the load ZL in order to get an impedance matching. But, I do not understand how it works. Precisely, by the ...
2
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1answer
195 views

Help me identify power issues with this PCB

I bought the following UPS module for my Raspberry Pi: Power Pack Pro The module kinda works, when I unplug the power cable, the module instantly switches to battery powered mode without restarting ...
2
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1answer
38 views

3 Phase PMSM Motor Current Measurement: Figuring out the 2 negative terminal currents with 1 positive current measurement

I am trying to implement F.O.C for a PMSM machine with a custom made inverter board. The H-bridges are from Infineon (IFX007T) and they provide current sensing capabilities. The problem is, i need the ...
2
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1answer
81 views

[Last Update]Simulating an RLC circuit with the 1N3880 in ngpice did not show any results or graph

Im trying to do a transient response analysis with ngspice/gnucap and gspice UI of the next RLC circuit (corrected the source polarity), to find the damping effect in the system. That with the next ...
2
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1answer
40 views

Distribution-side voltage regulation and Low voltage ride through (LVTR) curve

Nowadays, I see that photovoltaic systems have Low-voltage-ride-through capabilities. So in case of a fault, when the voltage is decreased, they remain connected to the grid and provide reactive power ...
2
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2answers
136 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 ...
2
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4answers
2k views

How do MPPT charge controllers curtail the power if the load is less than the solar generation?

I am trying to understand how MPPT charge controllers work when the load is less than the solar power generation. Let's assume an off-grid system with battery backup and no dump load. In my ...
2
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1answer
77 views

Driving a 12VDC solenoid from a 24VAC signal

I would like to put together a circuit that does the following function: 1) You input 24VAC. 2) It outputs 12VDC pulse to drive a 3W, 4Ω latched solenoid. 3) Once 24VAC is removed, it outputs a ...
2
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2answers
474 views

what does offline mean in flyback topology [closed]

What off-line means in flyback converter. is there any online also. if yes please describe
2
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2answers
86 views

High-Speed electronics - Reflections in T-intersection

I'm currently attending a course on "experimental problem solving" and we just started talking about TDR (time domain reflectometry). I do understand that reflections occur whenever there is a change ...
2
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1answer
182 views

Uncontrolled Bridge Rectifier

I am getting wrong answer for the above problem. My book says R should be 23ohms. Please guide me where I am doing the mistake.
2
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1answer
2k views

How sinewave pwm inverter filter output?

I know about inverters is as follows (correct me if I am wrong) DC source such as battery fed current into transformer by controlled switches such as mosfet or IGBT. This controlled current fed into ...
2
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1answer
199 views

Help with semi-controlled full wave monophasic rectifier using MOC3011 and SCR

I'm trying to build a full wave semi-controlled rectifier with this circuit: The zero's detection is working well and I am firing the TRIAC depending on the position of the potentiometer, the ...
2
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4answers
740 views

Mosfet Conventional current flow direction in the circuit

I am working on a project to control heavy loads with Arduino up to 10 Amperes. I found the circuit which is made using p-channel Mosfet and a p-type transistor. I am confused in the flow of current ...
2
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1answer
382 views

How to define working voltage class net to calculte the creepage?

I work of a project of single phase PFC converter and I need to define the working voltage to each each NET of Schematic to calculate creepage distance. I have a question about the low voltage of NET ...