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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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voltage variations

I have a project related to AC Voltage variation detection circuit. That is any variation in voltage detect, LED indication will come. SO I try to sense the current variations using a current ...
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2answers
158 views

Why this circuit may consume some extra current?

I have this transistor circuit with relay. Here the transistor input is connected to the GPIO pin of the micro controller. According to whether this relay is ON or OFF, then phase voltage is passed (...
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1answer
45 views

PTC thermister value

I am trying to find out specifications of a thermister on which "10P" is printed. Its resistance at room temp. is 18 Ohms when the circuit is power off. How can I find out its specifications? This is ...
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0answers
11 views

DQ transform on AC voltage source

I have a simple AC circuit made in Simulink where a dq transform is applied to a AC voltage source which is connected to a RLC load. I understand that dq transforms are used to convert synchronous ...
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1answer
69 views

Amplifying Sinusoid From Microcontroller to ~40V 3-5A

I’m investigating transient switch arcing that occurs in a 3 phase switching unit. I am planning on generating the phase signals with an STM32F4 using DAC and DMA with timing separation for the phase ...
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0answers
30 views

MOSFET pinchoff reduce current

I understand that in an n channel MOSFET as Vgs increases, electrons are attracted towards the gate forming an n channel. These electrons are responsible for the conduction of the MOSFET. As Vds ...
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1answer
39 views

H-Bridge freewheeling

I am building an H-bridge motor control for DC motor . I am using "SQD40N06-14L_GE3 " N_channel MOSFET. Did i have to add a rectifier in parallel with the mosfet (the mosfet already have one ...
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1answer
22 views

Slip Control vs Constant V/F Control for 3-Phase ACIM

I am trying to understand how is Slip Control different from Constant V/F control. If I need to control the speed of 3-phase ACIM then its slip would obviously change with its rotational speed then ...
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35 views

Using 19V, 3.4A power adaptor instead of prescribed 12V,3A power adaptor on an embedded box PC

I have an embedded box PC: Advantech Ark1122H. Instead of the prescribed 12V,3A power adaptor, I accidentally used a 19V,3.4A power adaptor that is supposedly for another embedded box PC. Now this PC ...
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1answer
44 views

MCB with electronic trigger-off [closed]

How can I design a system that gives the functionality of an MCB (overload protection, operates in an AC circuit) with an electronic trigger-off. So that once the device is in ON state, it should be ...
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2answers
67 views

I want to boost 0.45V and 0.6mA to 0.7V and 3mA suggest me a circuit which can do that [closed]

I'm doing a project that basically transfer the power from a laser and light up an led using it. The power output we are getting from the laser is at most 0.45V and 0.6mA (we used photodiode to ...
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0answers
29 views

Using a single battery for robot motors and electronics

Instead of using two separate 12V SLA batteries (one for motor controllers*, one for Arduino, LEDs, sensors ...), would they work in series as one 24V battery, with a step-down converter for each ...
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32 views

SCR reverse current during switch off

In the figure below is shown the dynamic behavior of an SCR in terms of its current during switch off. I'm interested in calculating the maximum reverse current (iR in the plot). The parameters that ...
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2answers
40 views

Sizing cables in pulsed power applications

I am looking for rules for sizing cables for short pulses. For example, if I were to run 2000A DC current for 0.5 seconds in a cable, what size would I need? Sizing as if it were continuous current ...
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1answer
58 views

Bootstrap cap value and how it relates to fsw and duty cycle?

I am designing a synchronous buck converter with mppt. I have a question about the bootstrap capacitor value. Knowing that the duty cycle and fsw are dependent on this value. What is the best approach ...
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0answers
53 views

Flyback Converter Switching MOSFET Breakdown

I am using a UC1845A to control the switching element MOSFET (FCB20N60F) which is used for a typical Flyback Converter circuit. MOSFET's drain is connected to transformer. Rarely MOSFET is not working ...
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0answers
28 views

Solar panel voltage with buck converter and mosfets?

If the input voltage of the solar panel as Vin in the picture below. if Vin is in the range of 10 V to 37V.The average voltage value in the node in yellow during switch 1 is on and switch 2 is off is ...
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2answers
115 views

Drive 12V Automotive Relay from 3.3v ESP32

I am working on a project to start a vehicle using Automotive Relays. And I am following this circuit in the tutorial to do so. Everything works fine on Arduino UNO. But I want to use ESP32 of this ...
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1answer
52 views

driving high and low side mosfet for synchronous buck converter?

I am designing an MPPT charge controller. I have chosen my MOSFETs to be both NMOS https://www.sparkfun.com/products/10213 (FQP30N06L) 60V, 30A. Since the gate voltage is 3 to 5V. I can drive the low ...
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1answer
46 views

Simulation of a chopper type E (four quadrants) in pspice

Im trying to make a chopper working in the four quadrants based on these idea translated to this circuit But it cant be simulated, psice gives the next log ...
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1answer
46 views

What is the difference between commutation number and pulse number in?

My question is about bridge rectifiers in power electronics. I guess the jargons are too vague, so i quote the exact definitions from my book which i don't understand at all: m represents the ...
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0answers
23 views

What does 'Rectifier Loading Effect and Loading Factor' mean

I came across the terms 'Rectifier Loading Effect' and 'Rectifier Loading Factor' when reading IEEE Std 421.5-2005 Recommended Model for Power Stability Studies, mentioned in those ACxA models. What ...
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1answer
29 views

Can you charge a NIMH battery with a trickle charge NiCad battery charger

Purchased older RC airplane complete kit Air Tronics transmitter in kit not made anymore old NiCad battery (10 plus yes) was replaced with new 9.6v NIMH battery can the old NiCad trickle charger that ...
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2answers
81 views

Buck Converter won't switch properly

I'm trying to use TI's LMR16006 Simple Switcher Buck Converter to regulate 48V down to 5V on my circuit. I used TI's WebBench tool to calculate component values for their reference design, and had a ...
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3answers
49 views

Parasitic elements at circuit level

In power electronics, when we build the important circuits like Totem pole PFC circuit or Quadrant VII converters etc, how do we start looking into parasitic elements (inductance and capacitances ) ...
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1answer
27 views

is it possible to take diffrent voltage at fan manual regulator output?

I have a manual fan regulator , if i am applying input to 230v to input , output will be get different voltage (by turning regulator prob). is it possible to take different voltage?
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1answer
30 views

Increasing TPS63001 Under Voltage lockout from 1.8V to 2.5V for use with LiFePO4 cell

The Under Voltage Lockout threshold for this chip ranges from 1.5 V to 1.8 V. I want to use this with a LiFePO4 cell, whose minimum voltage is 2.5 V. With reference to the datasheet here, the VINA ...
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1answer
50 views

Digital DC DC Converter for Power Control

I want to find a way to control a power device from a microcontroller. I must control a power device from the microcontroller, making the voltage to vary betwen 0 and 28 VDC, knowing that the power ...
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2answers
27 views

Synchronous rectification name explanation

In different power supply topologies synchronous rectification is used to improve efficiency. The diode is then replaced with a MOSFET, which emulates the behaviour of the diode . My question might ...
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4answers
200 views

Why this 100k resistor is placed?

I got a status taken circuit (as shown) from Google .. My doubt is why this 100k is placed in neutral line? any other way can modify the input ?
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1answer
75 views

How do I connect an LED with floating DC voltage?

I want to connected an LED at the output of 500V DC. This DC power supply is made by 3phase DC rectifier and is floating. I would like to have a display on the front panel of the supply which will ...
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2answers
89 views

Protect Inverter from Transformer's Inrush Current

Consider a "small" autonomous grid, which is based mainly on RES and has a few diesel generators, like in the following figure Everything runs smoothly, feeding the small load. Suddenly, the big ...
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2answers
35 views

Variable Current Amplifier for Fan Control

I'm working on a project where I need to vary the current supplied to a DC fan. I am currently trying to use a BJT as a current amplifier to amplify a low current analog output (0 to 100 mA to vary ...
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2answers
111 views

MOSFETs blowing up on BLDC motor controller upon battery connection

I'm trying to build a sensors motor controller for a 500 watt bicycle hub motor. The problem I am having with it is when I connect power (4500 mAh 12s lipo) I usually destroy a transistor or two ...
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3answers
119 views

Will a resistor be damaged if power rating is surpassed momentarily?

I am using a power resistor to discharge an 82uF capacitor from 500V to 40V in 5 seconds. Using this online calculator, the peak power on the 24k resistor will be 10W. Because the capacitor is ...
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1answer
41 views

Zero Voltage in a power semiconductor chip

In an ON-mode silicon IGBT chip operating within a real power module, is the collector contact fixed at 0 V or emitter? What about Power SiC MOSFET? enter link description here
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1answer
127 views

AC mains rectifier issue

I built a simple full bridge rectifier with AC Mains input, but I noticed that: When the input is 220 V rms the DC output is only 293 V, but I expected the DC output voltage to be 220 x sqrt(2) = ...
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4answers
2k views

Indicator light circuit

I'm an electrician and my work is to maintain boats. I have a problem. On the boats are sailing lights, and for each sailing light is another light inside the boat that tells you if the sailing ...
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3answers
146 views

Current limit control using microcontroller

What I want is to open the MOSFET once the current passing through it exceeds 3A. A fuse is already being used, but more protection is needed. There are some options to do it. I could measure the ...
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1answer
39 views

Voltage of ESC of ebike to motor

I have 3 cables (blue,green,yellow) from my ESC to my motor. However I’m confused whether the voltage it provides is AC or DC. Does the nature of the voltage have anything to do with the kind of motor ...
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1answer
57 views

Fast 5V DC power monitoring

I am designing a camera that is powered by a 5 V DC power line. I need to evaluate the peak power consumption of the device during image capture. At a pixel clock period of 40 microseconds I expect ...
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2answers
35 views

Can I connect a 15A surge protector to a 13A extension cord?

As someone who’s studied engineering, I should be able to answer this question. However, a quick search online has me confused. Provided what I’m plugging in (a laptop drawing relatively little power)...
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2answers
86 views

What does this symbol on a contactor represent?

What does this symbol represent? It is connected to a contactor.
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2answers
70 views

Problem in IR2112 use

What is wrong in this connection diagram. I had provided pwm with 20kHz and 5volts. But at the R3 I am not getting results
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1answer
199 views

Fuse symbol on toroidal transformer

I was searching today for a new 24V transformer, and I found that some of them have a "fuse" symbol on their label, and I was wondering what this fuse symbol means? Does the fuse symbol on a ...
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1answer
54 views

Buck converter design issue

I want to design buck converter for 385VDC to 48VDC for that I calculated the values of component and simulated it with proteus but I am not getting the desired output. What is wrong? PWM has a 20v ...
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0answers
44 views

Equivalent Circuit of Howland current Pump

Why is at norton circuit for Howland current pump the current source is taken as vi/R1 instead of vi/R0? Because the formula for Norton current is IL=In*(Rn/(Rl+Rn))
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1answer
104 views

explain the working of this circuit [closed]

I'm basically trying to understand how this Dc to Dc step-up converter work. please help me.[![dc-dc step-up voltage converter 1v-9v][2]][2] I need to design a DC DC step up converter using bjts. ...
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1answer
143 views

[UPDATED, not solved]Simulating a Buck converter

Im trying to simulate a buck converter done in class to see if this fits what the theory says it would be, It must receive 110 V and send to the load around 60V and 20 A, the circuit is: And with ...