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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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48 views

Can someone help me design a circuit that will open when power is applied and close after power is removed?

I am using an air conditioner thermostat transformer which provides power to my circuit. When the thermostat powers up, the door opens. I want the door to remain open until the thermostat shuts off, ...
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2answers
46 views

Ic-Vge IGBT Curve

In the figure below, presented in the manufacturer datasheet, you can see the Ic-Vge curve of an IGBT device. As mentioned, it has been drawn at Vce=20V. What does this equality mean? Can we have such ...
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3answers
93 views

Power of audio amplifier not matching specifications

I have a Cerwin-Vega CV-2800 audio amplifier which is rated for 600 watts at 8 ohms, 900 watts at 4 ohms, and 1400 watts at 2 ohms. I also have two PWR247T-100-1R00F 1 ohm resistors rated for 100 W; ...
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1answer
40 views

Driving multiple loads with a single TRIAC and multiple optoisolators

I simulated this circuit in multisim. It is working fine. However, I am just curious to know if it is possible to drive multiple loads with multiple opto-isolators with single TRIAC? Something like ...
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2answers
311 views

Why is it bad to have an inductive load (context: dc-dc converter)?

In the book I'm studying from Power Electronics - Mohan he says: (...) has two drawbacks (1): In practice the load would be indictuve. Even with a resistive load, there would always be certain ...
2
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4answers
442 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 ...
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1answer
514 views

How is the extinction angle for a half wave rectifier with RL load calculated?

I have a couple of notes about the half wave rectifiers with the RL load, but I dont quite undestand how is obtained the extinction angle \$\beta\$ ? simulate this circuit – Schematic created ...
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1answer
40 views

Series RL AC circuit Laplace analysis

Question: Find the complete expression for i(t) in a series RL circuit with source \$Vsin(\omega t)\$. simulate this circuit – Schematic created using CircuitLab So to attack this I thought to ...
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1answer
42 views

Driving an RL circuit with an audio power amplifier

I'm using a Cerwin-Vega CV-2800 audio amplifier to drive the RL circuit depicted in the diagram below: simulate this circuit – Schematic created using CircuitLab The amplifier is rated for ...
32
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3answers
5k views

Why does power dip during a lightning storm?

If lightning were to strike power lines, wouldn't you expect it to increase the power, and hence your room lights get brighter? Why do they go dim for 1 second at a time?
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6answers
501 views

Why plug is polarized in the US? What are the benefits?

I could not get a good hold of it, I searched online quite a bit. This must have to do with safety but then non-polarized switches are used through out the world with no issues are risks, so my ...
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1answer
119 views

why in case of dc neither of terminal is at zero potential? [closed]

why in case of dc neither of terminal is at zero potentialpotential while in case of ac ground is at zero potential ,let us consider negative terminal of the dc is at zero potential then why we use ...
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3answers
131 views

Should I add bypass capacitor for every IC and Microcontroller?

I am expecting a noise from a Power Source caused by motors. However my setup already includes a buck-converter, and have the input and output capacitors. Should I add bypass capacitors for the ...
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0answers
95 views

I want to make a heating element

I am going to buy a nickel-chromium wire for my heating element. I want to power it with one li-ion battery (20A 3000mAh) Intuition tells me that 84W (Draining the battery to its limit) might be ...
0
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1answer
44 views

relay control with network and sms with main controller [closed]

I need this project for a melting plant. There must be two relays in the control (connected to the device), so if one of them is in trouble, another will work to disconnect. In the (current check) ...
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1answer
45 views

How to safely connect multiple switching power supplies to one single cold device socket?

I apologize in advance, for only quickreading howtos, and, since I am only hobbyist, I actually don`t tinker with ac power generally. Today I can`t bypass this : I need to connect 3 switching power ...
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3answers
204 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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1answer
63 views

How could the Gate-Source potential difference be neglected?

I’ve been reading the book Electronic Principles by Malvino In the Voltage-Divider bias section of JFET, if gate current is negligible then how did Gate Voltage attain a negative value, given Vdd ...
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1answer
112 views

Can I drive a Low-Side MOSFET from a High-Side Driver?

I'm working on a power electronics project where it involves driving 4 different MOSFETs, (3 HighSide and 1 LowSide). Rather than using a different IC for the LowSide driver, I am thinking about using ...
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1answer
106 views

How much capacitance/joule/watt is needed on average household' energy storage system with supercapacitor?

I am on the process of making assumption how much capacitance/joule/watt is required on average supercapacitor as household' energy storage system. I plan the design for energy hub to be charged by ...
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4answers
134 views

I want to draw 20 amps from my home power outlet is there any way to do that safely?

I'm wanting connect up a bunch of Raspberry Pis (micro computers) to one power outlet in my home. At about .5 amps per computer * 40 computer means I will need to draw 20 amps. Now, I know that I'...
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1answer
1k views

Symbols: Double-arrow circle enclosed “10” on electronic appliances

What does the symbol that says 10 inside the double arrowed circle mean? I have seen a similar symbol on another appliance that had the number 25
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1answer
83 views

can SPDT relays replace SPST switch? Or does it depend on the particular implementation of the relay?

I am working on SKU consolidation and my concern right now is if I have a cheaper option of SPDT switch with all the ratings same as SPST switch which is currently used. Can I replace it? Or does it ...
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2answers
637 views

Diesel generator consumption formula

I am working on a project to monitor a power meter parameters like voltage, frequency, current and so on and this monitoring for both AC and DC. For DC we are using Cummins diesel generator, now I ...
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1answer
41 views

What load can i connect if data sheet is missing output voltage

I am looking at a DC to DC converter data sheet that has an input voltage of 0V-100V. The datasheet only mentions a max output current of 4 amps. Is it safe to assume I can place a load of any voltage ...
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0answers
43 views

Can a CM choke saturate due to the leakage inductance?

On a 3-phase common-mode choke, if the three currents sum to zero, then it will theoretically never saturate. I understand that the leakage inductance stores energy in the core. Can the three phases ...
0
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1answer
81 views

PCB key contact [closed]

Hi! anyone knows how to design a pcb like this in the photo with eagle? Someone has a guide to do it? I don't know how the resistor should be placed. It is basically a pcb for a synth, the key ...
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2answers
81 views

OpAmp Comparator Circuit Design for High/Low voltage measurement

I am new to this. I want to make a circuit to measure the voltage from (0 ~12 V), which can have 2 op-amps as comparator to give the output positive, when the voltage goes from 8 V to 12 V and give ...
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3answers
137 views

Circuit design with multiple voltage levels

I'm working on an art piece based around an Arduino Mega that essentially requires power for three types of devices: Solenoids (4): 24 V, ~100 mA a piece (400 mA, 9.6 W total) NeoPixel LEDs (1280): 5 ...
4
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2answers
501 views

Capacitor and inductor working principle

I want to know that there is opposition mechanism of current in inductor say back emf than what is opposition mechanism of voltage in capacitor ??? And also want to know that when inductor suddenly ...
0
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1answer
87 views

Power Supply wiring check

I'm not too confident with electronics and I'm currently working on a project where I need a 12V mains power supply. I got a switch for it and have wired it. I've shown pictures. Is this wiring ...
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0answers
86 views

Are there commonly used equations for short-term overpower of wirewound resistors?

If I have a wirewound resistor rated for 250 W that might need to dissipate, say, 400 W for several seconds, is there a commonly used equation for finding its temperature rise or time to failure under ...
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1answer
28 views

HID Lamp Ballast Using TI UCC2305

I am trying to control an OSRAM XENARC 66140 35W HID (High-intensity discharge) Lamp with a circuit which contains Texas Instruments UCC2305. I have obtained 4 original lamps from OSRAM and tried on ...
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1answer
100 views

Advice for a LiPo UPS

I want to make an UPS using a LiPo battery for a SIM800l cellular module, I have an SIM800l module attached to a 3.7V wall adapter but I also have connected the SIM800l to a 3.7V LiPo Battery, I want ...
0
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1answer
124 views

Analog to Digital conversion for an old analog synth

I'm trying to convert an old analog synth into a digital one. I'd like to bypass the speaker and read the values of the speaker with my arduino. But I don't know how to do it
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2answers
517 views

Buck converter design (311V to 3.3V)

I'm trying to make a buck converter which produces an output voltage of 3.3V with a load of around 1 amps when the input is around 220v AC. This basically means converting from 311v DC to 3.3v DC. I'm ...
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4answers
72 views

What stabilizes the alternators/generators?

I've completed my intern in hydroelectric power plants. I've seen large generators working to maintain voltage in 50Hz. They were turning at 187,5 rpm with 32 poles. But I wondered what stabilizes ...
1
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2answers
107 views

boost converter for ultra low power application

I want to design a dc-dc boost converter and manage power (MPPT) for an ultra-low power fuel which contains input voltage < 1 V and input current < 500 uA. if I choose simple boost converter, I ...
0
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1answer
43 views

Testing short in circuit

I think it is a very simple test to perform, but I do not know the correct equipment for this. I just have a basic LED circuit, resistor before LED, but I want to test a short in parallel with the ...
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1answer
77 views

What is this? Could this help aid in creating an electromagnetic field [closed]

out of a Carvin Dcm1500 amp, and I was wondering if you guys could maybe tell me what it is, what it does, and what the connectors do? Thank you!
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2answers
256 views

What causes SMPS voltage ripple?

In many datasheets and application guides there is always an equation for ripple current, because it is fundamental to the operation of a buck or boost converter, but I never see a direct equation for ...
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2answers
104 views

How do I understand the effect when the load current is over the inductor's saturation current?

Got a question about the effect after the current over the saturation current in a buck DC-DC regulator. I'm thinking of a theory that due to the fact that the inductance will be downgraded if Isat ...
0
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1answer
33 views

What does it mean to have dual input range?

Hi guys I am looking for a wide range input voltages DC-DC Converter as my inputs would vary from 12,24,36,42Vdc. I found this, the Murata NCS12 series which have an input ranges of 9-36V and 18-75V. ...
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1answer
37 views

Relationship between heat coefficient and conductance

I'm involved in a project and part of it involves heat coefficient and heat conductance. What's the relationship between the two, given that the SI unit for heat coefficient is \$W/mK\$ and the SI ...
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1answer
253 views

Why does a wind turbine deliver reactive power to the grid during no winds or when turbine is stopped?

An answer to a previous question explained that a turbine in stop mode may deliver reactive power to the grid. It also takes active power from the grid to run its control system, lighting system and ...
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0answers
70 views

What do you think about my PSU design?

I have designed a symetrical PSU using LM317, LM337 plus power BJTs. The desired output range is at least 24V-2V @ 6A max. Altough not shown in the schematic, i plan to add power resistors and a ...
2
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2answers
357 views

How do designers know about kilowatt power of wind turbine generators like 1.5 MW?

Generators and transformers are always designed in kVA because designers never know about the load it will provide power to. Then how do we know the wind turbine generator will deliver 1500 kW or 2 MW ...
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0answers
34 views

Automatic Battery Charger that disconnects battery from load ciarcuit when charging. (Power protection)

I am struggling to find resources to guide me in how I learn about power protection. My board draws current from a battery. When I plug in a USB to this circuit, I would like the battery to charge ...
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2answers
58 views

Selecting suitable relay for car fuel pump

I am working on a project in which i will control the car fuel pump using relay to turn it on or off. I want the relay to be suitable for keeping the fuel pump continously working for over 15 hours ...
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4answers
286 views

Question regarding ripple factor

For the pictures above, I am confused as how to how they got/derived the formulas for the peak to peak ripple voltage (VrPP) and Vdc. So far, I got the output voltage, which is 14.9 volts. However, I ...