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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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15 views

Why is not the Thyristor reverse in Three phase VOltage controller

In the period indicated with red: The thyristor T6 is turned off upon zero -crossing then , re-fired , while it is instantaneous voltage is positive . How is that ? And why not fire T2 instead ? I ...
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44 views

Does 18650 cell voltage sag have a direct relationship with its internal resistance?

When a cell is connected to full load does it drop some of its voltage due to internal resistance and quickly jumps back to normal whenever the load is taken off??
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How stable is USB powerbank to power your circuit? [on hold]

If you have a circuit that requires 5 volts and 1 ampere. How stable do you think is a USB powerbank? Is there a possibility that the voltage can fluctuate when it's near the end the its life? What's ...
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37 views

Low Dropout Regulator Enable Delay

I have a main buck DCDC 5V that feeds to five different LDOs(3.3V). To create power sequencing, I would like to use a resistor and a capacitor at the input of the enable pin of each LDOs and by ...
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27 views

Charge and power distribution circuit with multiple batteries

I’m looking for solution for electric vehicle charge and power distribution system PCB. For some reasons I want to split battery to several Li-Ion packs in separated units (hulls). I see the next ...
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69 views

Current delivered by the vehicle alternator

I have a vehicle alternator with following parameters: 14V, 140A. In parallel to this alternator is connected 14.4V vehicle lead acid battery. The alternator is used as a power source for a load which ...
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1answer
38 views

Buck converter step response

I am simulating a current step in a buck converter with a resistive load that I designed. I am measuring the response while stepping the current up from 5A to 10A and stepping the current down from ...
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22 views

How to adjust the switching speed of Totem-Pole Bridgeless PFC? [closed]

How can I vary the switching speed of the totem pole PFC? Increasing the MOSFET gate area can vary switching frequency of the MOSFET. So does it mean it also vary the PFC rectifier switching speed? ...
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32 views

How to calculate V/f value for an Induction motor?

I want to implement constant V/f in variable speed Inverter of a 3-phase Induction motor, 1500 rpm, 4-poles. I also know the equation: V/f = 4.44 × N x Phi Phi is maximum value of flux, f is ...
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50 views

Improvising for a 5v 2A device [on hold]

My 5v 2A charger got damaged, my phone is a 5v 2A device. So I was wondering if connecting two 5v 1A chargers in parallel to give me 5v 2A to charge my phone will be a good idea?...
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30 views

How to measure correctly efficiency at high load with LT8646

i'm trying to measure efficiency of a LT Part LT8646 at high load with the attached schematic. i'm using a dynamic load and a power supply to give 12V. I'm using a digital multimeter to read the ...
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38 views

LTSpice buck converter output voltage too high

I am designing a 311V to 48V buck converter in LTSpice using ideal components for now. I am using a 48V/311V = 15.434% duty cycle in V2 which controls S1: This is the simulation output: Below is ...
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88 views

How DIAC works?

I edited my whole post for more refreshed information I learned about DIAC. Let's consider the following circuit and how it works. First of all the Vs must be higher than break voltage of diac, so ...
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72 views

Control of battery charging

I have been developing a control software for charging and discharging battery in a dc grid. The system consists of: 01) Three phase alternator with three phase diode bridge rectifier at its output ...
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24 views

Can I use a soft switching IGBT (FGA 25n120: given in specification) for my variable frequency drive power circuit (frequency around 10-20kHz)?

I am building a variable frequency drive from scratch. The design worked well with switching MOSFET. Now I need to increase the power output and DC bus voltage so that I would like to implement ...
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30 views

Should I charge an in-series 6-pack of Li-ion batteries at 4.2v 1A or 25v 1A?

I have a 6-pack of 18650 Li-Ion cells connected in series, so it gives around 22v dc output. To charge a single Li-Ion cell I need a 4.2v 1-1.5A charger, simple stuff. But to charge the whole 6-pack, ...
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39 views

Power devices max voltage, current, power, speed, etc. .. ratings

I want to know how to get the real world or the most recent or the reliable information about power devices max ratings in volt, ampere, power, speed .. etc., parameters. I found this picture that is ...
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How to change V and F in constant V/F control of an ACIM?

If I generate 3-Phase PWM outputs to drive a 3-phase ACIM and use constant V/F method for speed control then how will I change V and F of the generated PWM outputs? I will generate PWM's using LUT ...
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77 views

CAN BUS electrical characteristics

I know that CAN bus has two states. Dominant states where CANH goes 3.5V and CANL goes to 1.5V and in recessive state, both CANH and CANL goes to 2.5V. My question is, how much current does it draw in ...
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58 views

How triac acts as a diode and two transistor?

I'm constantly reading this fact that a Triac acts as a diode and two transistor. Can someone explain it.
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1answer
40 views

Using a Main Surge Protector for only branching out other surge protectors

Whenever I try to find information about this question it always says that it is not good to plug in a surge protector into a surge protector because you can overload or overheat the protector or ...
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1answer
41 views

Characteristic Impedance without transmission lines

let's consider this three port power divider: I saw somewhere that the reflection coefficient Г11 can be calculated with the formula Г11 = (Zin - Z0)/(Zin + Z0), where Z0 = 50 Ohm. Now my questions ...
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53 views

Input Protection Diodes Functioning with Circuit Breaker?

I was wondering if I was correct in assuming these diodes were being used for ESD protection on the input of a power circuit. I'm a little bit confused what the point of the diodes are when there's a ...
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38 views

polarised condensor microphone

Sir/Madam, Kindly explain how is the following equation derived for the polarised condenser microphone? The output voltage V0 fed from the microphone to the preamplifier will be how is it derived? ...
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26 views

Difference between magnetizing inductance and primary inductance

What is difference between magnetising inductance(Lm) and primary inductance(Lp) of transformer?
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75 views

How to classify power electronics components in 2 main groups?

I'm working on preparing a course about power electronics, and with my basic search conclusions. I thought that if it's possible or acceptable to classify the power electronics components in 2 main ...
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46 views

Using an X or Y rated cap in DC link

I'm wondering if I can use an X or Y rated film cap for high frequency DC link filtering/snubbering. The system will be a rectifier+inverter, so the cap in question will go on the DC link between the ...
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115 views

Multiplication of average voltage and current?

Multiplication of \$V_{rms}\$ and \$I_{rms}\$ gives average power. What things we get if we multiply \$V_{avg}\$ and \$I_{avg}\$??
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35 views

Controlling multiple floating power supplies from a single point

I have assembled a power supply from five HP dps-750rb common slot power supplies. All five units are in series. I have the first grounded electrically and have the other four units modified and ...
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2answers
41 views

AD8318 Maximum Input Voltage

let's consider AD8318, a chip which contains a logarithmic amplifier, often used for power measurements. I have read its datasheet and there is a thing that I do not understand: no maximum input RF ...
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19 views

Peak Current in a transmission line

Let's consider a transmission line (which drives a generic load ZL) connected to an AC voltage source. If we know that the peak voltage of the source is equal to Vp, how can we evaluate the peak ...
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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 ...
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78 views

Wave Propagation in Transmission Lines

let's consider this image (from AAC book, see here) The author wanted to show that a transmission line propagates not only voltage and current waves, but also an electromagnetic wave in the space ...
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42 views

Current Transformer Rated primary current vs Max. Primary current

I've been reading up alot on how to work with a CT. Basicly you have a primary current (eg: 100A) and a turns ratio (eg:1:2500) and a load resistance (eg:5 ohms) so now things are straight forward we ...
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86 views

How is the impedance of a circuit calculated when non linearity is introduced from a switch

What is the impedance of the following circuit if the switch operates at the same frequency with the input voltage. Since the switch introduces non-linearity to the circuit, how can I calculate the ...
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96 views

An ideal op amp is given (with infinity gain), what is the current flowing through all the resistance for the given circuit?

my problem is that do the output terminal of the op-amp behaves like short circuit of output terminal of the op-amp to its reference ground as shown in the ideal op-amp internal circuit?
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32 views

How to activate FP6293 converter from EN pin?

I'm making a portable device which is powered by a lithium battery and boosted with a FP6293 boost converter IC. I want to turn on and off the device from a switch that activates and deactivates the ...
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2answers
247 views

Is it possible to make an IGBT to work at duty cycles up to 100%?

I am designing an IGBT based chopper with single Low side switching IGBT (chosen low side switching because ease of driving the IGBT.) There are plenty of resources available for SMPS (buck, boost, ...
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48 views

MP1584 5v regulator voltage drop problem

I was debugging the MP1584 module, 5v regulator circuit in the PCB. I have attached my debug circuit below. I have completed my circuit in breadboard and PCB also, but I was connected to any load ...
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103 views

Voltage doubler and power

Lets consider for instance this voltage doubler: It was told that a practical limit of this circuit is the fact that we cannot absorb too much current from it. But I wanted to verify (if it is true) ...
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1answer
45 views

Identify specs of this filter coil and enable independent use of PSUs fed through it?

Shown in the pictures is a power supply and distribution system from an old Fuji Xerox all-in-one copier/printer/binder/etc. In the image that shows multiple components you will see the components ...
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101 views

Is this an active or a passive circuit?

Is this an active or a passive circuit?
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2answers
70 views

TMS320F280049C: Unwanted pulse on GPIO during power on/off

I'm using the TI TMS320F280049C microcontroller. While testing its GPIO behavior during power on/off, I found a high to low transition on GPIO pin, on every power on/off. I'm checking the waveform ...
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1answer
32 views

An On/Off switch that can be controlled by an Arduino

I am a complete newb in electronic, so excuse me if I'm asking something completely basic, but here's the problem - I have an Arduino UNO board, a battery and a motor. The arduino itself can't power ...
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20 views

Swapping Park and Clark Transforms

In the 3-phase Vector Control of AC motor if we swap the order of Park and Clark transforms (as well as their inverse transforms) will we get the same result or will we get meaningless output?
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43 views

How can I connect a Peltier Element?

I need help to anyone who can help me 🙂 A peltier can be reversed. So If I supply + to RED and - to BLACK it works as expected. But if I reverse the polarity, ( - to RED, + to BLACK), it will also ...
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48 views

What is the expression for collector current (Ic) in function of CTR for optocoupler?

I'm just asking about expression for collector current (Ic) of optocoupler in function of CTR because my simulation results doesn't fit with the CTR=Ic/If equation. Simulating the part CNY17-3 with ...
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2answers
52 views

Effect of output inductor DCR on switching power supply

I'm not an EE but I'm attempting to gain hobby levels of the skill. So I'm building a DC/DC power supply as an exercise. I built a PCB design for a TI chip (TPS560200) with associated passives based ...
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81 views

Need a processor to be able to turn off its own power

I have a processor that is powered by a mains 5V power from a wall adapter, and has a short term battery backup. I need the processor to turn on automatically and immediately when 5V mains supply is ...
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57 views

What is the effect of doubling the airgap in a flyback converter?

If I understand correctly it would flatten the hysteresis curve. So it would allow to store more energy and it would also decrease the permeability of the core. Would it have another effect or will ...