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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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105 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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86 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 ...
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99 views

Can this push pull oscillator improved for experimental realization?

I am using the following push pull oscillator circuit is extracted from this Application Note for implementation of a wireless charging system. In simulations, it's efficiency is above above 85% when ...
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252 views

BQ24133, unable to charge the battery

I have designed the circuit around BQ24133 and in my humble opinion, chose the right components while following the datasheet. I had the PCB made, soldered the components and started testing. The next ...
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1answer
43 views

Sharing ground between devices connected to same power supply

Several Raspberry Pi projects I've seen, using two modules, have a jumper wire between both GND pins, when a physical connection between one or more pins is needed between both modules. What is the ...
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1answer
68 views

Low voltage control of 75V piezo actuator

I am looking to perform position control on a 75V piezo linear actuator with a Raspberry pi. To do so I intend to use a 5V output DAC and some kind of power amplifier to amplify the range between 0V ...
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995 views

Power factor and Harmonics associated with Electric Vehicle charging

What is the power factor associated with (typical) DC fast chargers and onboard chargers in electrical vehicles? Also, how much is the harmonic content (especially triple-N harmonics) associated with ...
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81 views

Driving MOSFETs with Bootstrap connections

I'm designing a type of a buck converter which has the following circuitry. Simulation runs fine on PLECS and I've added three bootstrap connections to drive these high-side MOSFETs (All top three ...
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1answer
49 views

Is it possible to charge/discharge this cap fast enough?

What I have, is a common 12-pulse rectifier with its bridges in series and I included a snubber between DC-link and rectifier output. Is important to note that all inductances before the rectifier are ...
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68 views

One lipo battery to supply multiple circuit boards

I want to supply all my circuit boards with one lipo battery. The design is like this. I need a battery connector cable. So, I made my own battery Y-cable like this. I use XT-90 connector to ...
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36 views

What is the best way to connect 6S lipo 22000mAh to step down converter?

Can I use below step down converters with the battery below? I will be using multiple step down converter to supply to other boards like (IntelUp_Squaredboard,motordriverboard).These are the links ...
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42 views

Power source with buck converter, load and supercap

I have the following circuit created in MATLAB Simulink: I have a power source (Vfc,Rfc) on the left. Its operating point is set by using a buck converter (mosfet,diode,L,C1), which controls the ...
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32 views

What is the diffrents in below MOSFET circuit considering control circuit?

What is the different in below MOSFET circuit considering control circuit? What is the charge pump involving ? Is it required charge pump for the both the circuit?
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55 views

What's wrong with this modified 12-pulse rectifier topology?

I added two capacitors downstream in order to absorb AC component from rectifier current. Both Subsystem blocks are meant to form "triangular" currents in order to have these currents at both HV ...
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96 views

What's the best way to detect zero crossing in this design?

The design that I am talking about: I want to be able to detect the zero point with an MCU of which pin can withstand only 3.3 V. I'll forgo optocoupler because A. I want everything to be as cheap as ...
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133 views

Determining Buck Converter's source voltage average value from current waveform

Dear all, Given that the above is the instantaneous source current drawn by a buck converter, may I know how I should go about determining the corresponding average value of the source voltage? Edit:...
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64 views

Add pulse to sinewave (high voltage)

I am looking to add a pulse to a sinewawave. The input is high voltage AC so I cant use an op-amp adder. I have also used tried to combine the signals through large resistors but that only averages ...
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224 views

Identifying an IC named MT6617

Can anyone help me how to identify the component in the following image ? It's found on a power supply circuit (LED driver) Thanks in advance
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582 views

SMPS power calculation

I am planning to design smps power supply that using flyback topology. It will have 12V@5A output values. But it is not clear for me how to estimate input power. It will supply from 220 AC input port. ...
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1answer
34 views

Temperature-Dependent Electrical resistance Si and SiC

In a power electronics device, it seems that silicon carbide (SiC) has a higher variation of electrical on-state resistance with temperature in comparison to silicon (Si). Does anybody know the reason?...
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106 views

How much voltage multiplication can boost converter produce?

I want to make a PWM based inverter for my college project to convert 12V DC to 220V AC. But as the PWM output is not exactly sine wave, it can not be stepped up using a transformer. So I need to ...
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100 views

How do I apply mosfet switching to this battery circuit

I have this circuit: The circuit consists of a charging voltage (C+=42V,C-=0V), ~42V battery(B+=42V,C-=0V), and a low side mosfet switching circuit with an output P. When SW1 is connecting C and B, ...
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133 views

Design and simulation of snubber and hysteresis current control

I want to do an hysteresis current control with this circuit: that have three operation modes: in order to make the output current to follow a triangle wave as reference. I made a simple C code to ...
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55 views

Triac doesn't triggering when the power jack pins switched?

I built a power circuit with MOC3063 & BTA40600 for controlling heating element (2000 watts) according to the image. when I plug the jack in let's say one direction the circuit works like a charm ....
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61 views

Why we can consider inductor as a current source when the current loop gain infinite?

I am reading about current-mode control from this site. Please look at the excerpt below and especially the boldfaced part. Question: Why we can consider inductor as a current source when the ...
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44 views

Powering a 3 W DC/DC converter

I tried powering a XP Power IZ2415S and another similar converter with a power supply from an older laptop and it stopped working. I thought it would work because I assumed the laptop supply was ...
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1answer
141 views

Load position on triac ac circuit

I have simulated the following circuit and am curious to the position of the load resistor. The circuit switches an ac signal using a pulse. It seems to be common to have the load in the position or ...
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1answer
60 views

Equivalent one-output of a SIMO converter

The single-inductor multiple-output (SIMO) converter below is a dc-dc converter with one input, one inductor and n outputs Vo1, Vo2,..., Von and load currents Io1, Io2,...,Ion. Is there any theory, ...
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28 views

Power electronics problem: battery charger

Given the next circuit, I have to charge the battery of 12V with the one of 48V with a power transfer of 480W. simulate this circuit – Schematic created using CircuitLab Since inductors don't ...
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2answers
71 views

Ac dc circuits electronics

We know V(rms) is the equivalent dc voltage for same power decipation. But in half wave rectifier case wikipedia says V(dc) =V(avg) and not V(rms) . Why it is saying V(dc) =V(avg) and not V(dc) =V(rms)...
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1answer
43 views

SSR Switches Off Intermittently By Itself

I have a 24 ~ 380 V 100 Amp AC relay. It can be driven between 3 ~ 32 V, and I'm using a Raspberry pi to drive it with 5 V. The relay has a red LED that indicates it is "on". When checking up on the ...
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1answer
238 views

Average Inductor Current in RL Charging Circuit

Here's a switching circuit. The input Vs is a 24V rectangular pulse at 20kHz frequency with 75% duty cycle. Since the time constant L/R is very much greater than the pulse width, we expect the ...
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2answers
472 views

How does line impedance of a BLDC motor relate to the RPM of its rotor?

I am curious about the impedance of the three phase BLDC motor when it is in operation. If the speed of the rotor of a BLDC motor is proportional to the frequency of the three phase current, and the ...
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35 views

VI curve varistor and compere between varistor and arrestor

why we need to connect arrestor in parallel with varistor in some circuit ? and we know both is work to protect against high voltage? like this pic.
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1answer
141 views

Induction generator

I have an induction generator on the same shaft with induction motor. Both machines are same (have same nameplate: \$ U=400\,V\$, \$f=50\,Hz\$, \$n=1435\, rpm\$, \$P=9.3\,kW \$, \$ \cos(\phi) = 0.90 \$...
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184 views

IGBT SOA rating vs. Short Circuit rating

I have an IGBT (with integrated anti-parallel diode; forgive the BJT symbol in the diagram) that is switching an inductive load with a ~300 Vdc supply. The threshold voltage is ~5V and I'm driving it ...
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2answers
65 views

Battery testing and devices

I've been reading a lot, here as well, and from what I understand, your garden variety battery meter isn't truly accurate for telling you the voltage of a common household use battery at any given ...
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1answer
74 views

48V coupling into digital signal

I have a large thruster that requires 48V to operate, which I've provided through an isolated supply (Vicor DC/DC isolated converters). The thruster uses a Hall-effect sensor to adjust the speed (-5V ...
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243 views

Circuit Overvoltage Protection Using 12V Power Rail from Computer Power Supply?

I'm looking at building a circuit that is powered by the 12V power rail that is commonly provided with a desktop power supply. What would be a good rule of thumb for what an "overvoltage" scenario ...
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110 views

Isolating techniques for single power supply

Hello. I am working on a product which is used for measuring current from multiple channels(16 nos per device) using an onboard ADC. The device is powered by a 24VDC supply. Now even though the ...
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1answer
578 views

FOC Induction Motor Control - Rotor Flux Angle

In Field oriented control of induction motor it's necessary to do: Clark Transformation Park Transformation According to the note (page 3): http://ww1.microchip.com/downloads/en/AppNotes/ACIM%...
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1answer
348 views

Can MOSFETS work as perfect switching voltage dividers in practical?

Hi, I tried this circuit both in simulation and in practical manner. Below i used a gate driver IR2112 to drive the gates of the two mosfets, which boosts my PWM 5V amplitude signal to PWM 15V. My ...
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185 views

Is it true that inductors filter current harmonics and Capacitors filter voltage harmonics in SMPS?

In switch mode power supply applications, it is true that inductors filter current harmonics and Capacitors filter voltage harmonics? Is it true that in most applications we use LC filters due to the ...
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552 views

High-Frequency Transformer

I am trying to simulate a Dual Active Bridge DC-DC Converter in Matlab / Simulink So, I need to design a High-frequency Transformer with these characteristics: Vin = 350 V , Vout = 800 V, Pmax= 10 ...
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244 views

How this electric lighter works?

I have seen this type of electric lighter : But I don't really understand why the electric arcs are crossing each other instead of going straight.How is it possible?
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1answer
36 views

Are there methods to get the modulo of a variable voltage, with reference to another (constant) voltage?

If, for example, one has an input voltage of 5 Volts, and one wants to obtain this voltage modulo 3, as: $$V_\text{out} = 5\mod 3\text,$$ then how does one perform this operation using simple ...
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147 views

Switchable High Side and Low Side switch with FPF2700 & BTS3134N

I have had the bellow circuit designed with the intention of switching the high side of a 12v automotive relay: Now I've realised I need the option to switch the low side of relays, as sometimes I ...
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1answer
32 views

Does a datasheet paramaters of an IGBT gives you a DC , AC rms or an average value

For an example if you look at this datasheet for an IGBT datasheet , It has values for 1) Vces 2) Ic 3) VGes ect. Does these values give you a DC, or AC RMS or an average value?
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230 views

Selection of filters for an AC/AC chopper

I am involved in designing an AC/AC chopper circuit as shown in the above image. The details are as follows 1) The switching frequency is 10Khz and the input voltage is 240Vrms serving a load of 22 ...
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60 views

Is there a circuit that will take power from two sources and would use the second only if the first is down?

I'm looking for a specific circuit that would be connected to 2 power supplies. However, unless the first one fails e.g. power outage, the second one will not be used. I'm not familiar with the name ...