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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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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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1answer
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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2answers
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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1answer
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 ...
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1answer
58 views

Can Lead Acid and Lipo batteries be connected together to achieve higher resulting current?

I have a lead acid battery setup which has 3x12V 12Ah batteries connected in series resulting in 36V 12Ah output. I also have 3 LIPO batteries (1x11.1V 3300mAh, 1x11.1V 3000mAh and 1x12.6V 4500mAh). ...
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1answer
55 views

What is 'Nonrepetitive Peak Surge Current' in diodes?

I just went through many datasheets of diodes but didn't understand the term "Nonrepetitive Peak Surge Current". Can someone please explain this to me?
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0answers
49 views

Can a Capacitance Multiplier be used with high voltage outputs?

I am designing an SMPS which two output voltages of 5kV and 2.5kV. My transformer is split into four equal sections, each feeding a FB multiplier, connected in series to form the final voltages. ...
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27 views

Isolation voltage of a flyback transformer

How to calculate the isolation voltage of a planar flyback transformer? Or if there are any standards about it? I am designing a planar flyback transformer that need an isolation voltage of 1000V, ...
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1answer
49 views

Earth Leakage current understanding

In our design used TRIAC to control the load, As per the product field test setup i should short the neutral and earth connect together also the digital GND is connected with chassis. The input AC ...
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1answer
50 views

When IGBT is off what is the leakage current between collector and emiter?

When ı saw datasheet of IGBT, there are two terms of about leakage current between collecter and emiter. But ı can not be sure is these terms are about leakage current? These terms are Ices and ...
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2answers
41 views

How does Solar Cell efficiency relate to Band Gap/ Isc/ Voc?

I am trying to understand how does the band gap Eg relating to the solar cell efficiency. Efficiency is defined as VocIscFF/ Input power. if we have the same Voc * Isc product , that will translate to ...
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2answers
10k views

Weird resistor with dots around it on the schematic

I was looking through the LTC4041 datasheet and saw this: The 10mOhm resistor with the two nodes really close to it - is that a "special" resistor or something? Why have they drawn it like that?
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2answers
74 views

How to heat an e-cigaret coil

I am working on making my own "mod" for an e-cigaret (A mod is the device that controls when and how much the coil is heated up to) I have read a lot about it during the last couple of days, so i ...
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2answers
84 views

calculating Power

I wanted to ask, if I have a electrical component with a power rating of let's say 5W does this mean it would dissapate 10W after 2 hours and 15 W after 3 hours?? or is it correct to say it dissapates ...
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1answer
63 views

How to choose appropriate DC-DC converter for Electric Vehicle battery charging application? [closed]

I'm currently working on a project which requires building an EV battery-charger as a starting point. At present, I wish to design it for a 220 V, 50 Hz grid source input. The nominal voltage of the ...
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3answers
117 views

Can we connect Earth , Neutral and Digital Ground together in electronics system?

In our project has Digital Ground , Earth and Neutral. As per the requirement Digital Ground and Earth ground tied through Bead inductor. Is it advisable to connect Neutral with Chassis and Digital ...
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0answers
70 views

Bipolar transistors that only connect via base to emitter

I am trying to understand how to use this configuration of the LTC2992 power measure IC and the only part I am confused with so far is the two transistors which I have circled. What I know so far ...
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1answer
96 views

How to switch 220 VAC? (Magnetic relay, SSR relay or triac)? [closed]

I want to switch 220V AC with a microcontroller. Before I used magnetic relays or SSR relays, but now I want to use a triac for this function (like in this circuit) and my load can be any 220 V AC ...
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2answers
74 views

Under-power a peltier TEC1-12706 [closed]

Is it possible to power a peltier with 12 V and 1 or 2 A?
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0answers
37 views

Planar Transformer Design and Insulation Requirements

I am currently thinking of designing a planar transformer for my SMPS application. The input voltage will be somewhere in the region of 150V, the output voltage in the region of 1.5kV. First of all, ...
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0answers
19 views

Fixed Frequency Control of Multi-Resonant Converters

I am currently designing a SMPS based on the half-bridge LCC converter. Due to my application, it is desired to operate the converter at a fixed frequency. I also wish to optimize the passive ...
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1answer
60 views

How bad are 3 degrees Celsius for a lithium battery and electronics?

I have a PCB powered by a lithium battery , it works well inside the house, but when I leave it exposed to low temperatures with humidity the PCB or the battery stops working. I leave the PCB in the ...
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2answers
112 views

Power electronics DC DC converter question: What is the function of the capacitor and resistor connected between two series inductors?

This is a power electronics DC DC converter question: What is the function of the capacitor and resistor connected between two series inductors? This is part of the schematic from a photovoltaic ...
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1answer
38 views

Flyback Converter Transformer Leakage Inductance

We are in the process of designing an inverter , in which designing a step up flyback converter is crucial. The problem, we initially faced was there were more step down transformers available than ...
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1answer
45 views

By pass diode in PV cells

hope you all are well The bypass diode is usually connected in parallel with PV cell to avoid hot spot and prevent more PV output power losses. The bypass diode is connected in opposite direction to ...
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1answer
112 views

Why does collector current increase with base current in BJT?

The base current in the BJT is due to the recombination of holes and electrons. To neutralize the p region an electron leaves the p region. If we take it the other way round, the larger the base ...
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2answers
83 views

How to supply either 5V or 0V without the gradual PSU voltage bleed?

I have a 200W 5VDC power supply (Meanwell LRS 200-5). When I shut off the AC it takes about 60s for the supply to drain fully through the connected sensitive components (processors and storage drives)....
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5answers
3k views

Why/when is AC-DC-AC conversion superior to direct AC-AC conversion?

I am currently studying wind power and the power electronics used for it. In wind power a generator is driven by wind, thus the resulting power is of widely varying frequency and amplitude. The power ...
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0answers
16 views

Unexpected battery float voltage in BQ2057WSN charging circuit

We have designed a changing module using BQ2057WSN IC to charge a 7.4V, 6600mAH Li-ion battery. My supply power is 12V,2A SMPS. I have set my charging current to 600mA. The battery is charging, but ...
2
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1answer
240 views

Why is the output from this regulator not a constant DC?

I have built a link switch. The output is DC 5V but, when measured with an oscilloscope, itis not constant. Why does this happen? How do I get constant DC output? Any design problem? ...
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2answers
852 views

For a MOSFET, does capacitive gate current only flow through to the source?

Everywhere states that a MOSFET has no current at the gate. However, this is not true since, during the time the gate capacitance charges up to reach the certain voltage threshold, the current is ...
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 ...
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2answers
136 views

Contactor: when and how to use it

I hope my question is not too stupid. I'm controlling a brushed 48V 50A motor with a motor controller and I use two gel batteries as a power supply. I would like to use a low power signal to switch ...
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0answers
39 views

BQ2057WSN Circuit Heating issue

We are using BQ2057WSN charging IC to charge a 7.4V, 6600mAh Li-Ion Battery by providing 12VDC,2A power supply. According to my calculation the charging current is set at 625mA. But while charging, ...
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2answers
109 views

(THEORY QUESTION) If a diode was not placed in a buck convertor, when the switch is off would the load still be powered on?

(For Theoretical Purposes and Understanding assume the diode is not in the circuit) I just have a bit of confusion regarding the buck convertor when the switch is off. Since an inductor cannot change ...
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5answers
3k views

why neutral does not shock. how can a neutral be neutral in ac current? [duplicate]

When I probe my city mains with one probe in the live and one in earth (which should be 0 volt) it shows a voltage of around 250v. But when I probe the neutral and the earth it shows no voltage. I ...
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2answers
70 views

How to easily power multiple components with differing requirements?

I'm a long-term software developer who hasn't touched a soldering iron since Uni. I've been mulling an idea for a hardware project for some time, and have cajoled a raspberry pi into managing the ...
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3answers
94 views

Wind turbine charger controller

I need help on my design which includes a wind turbine, charge controller, battery and load. The question is, what will happen to the load if the wind turbine is charging the battery and while it is ...
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0answers
41 views

High Voltage Active Rectification using Silicon Carbide MOSFET

This is a purely theoretical question, please forgive me if I am being stupid. Synchronous rectification and secondary side control of DC/DC converters is very commonplace in low voltage, high ...
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4answers
70 views

Momentary Over-Excitation Voltage Circuit

I want to control an electromagnetic brake (fail-safe brake) used along with servo motor. Microcontroller will control the trigger signal for the electromagnet coil. Electromagnet Requirements: ...
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2answers
93 views

How to Size Line Reactors and Understanding Reactor Specifications

I've got a 600 VAC, 75 HP VFD that I want to place line and load reactors in series with. Usually, I find charts like this that give me a horsepower table to follow as they are the easiest to use. ...
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4answers
171 views

Removing output voltage ripple in high voltage outputs

I am looking to reduce the voltage ripple on a DC/DC converter operating at 5kV. I have looked extensively on the internet and have found multiple ways to reduce output voltage ripple, an ...
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2answers
25 views

DC Fault Characteristics of a Voltage Source Converter

According to this paper, the three stages in the DC Fault characteristic of a VSC are Capacitor-Discharge State (Natural Response) Diode Freewheeling Stage (When source AC gets disconnected and \$...
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1answer
62 views

How to detect MOSFET's open or not

In case Vgs is supplied and equal or above of its threshold level so that I expect it's open, but how about a fault occured which I don't know, how can I understand it's open or not by looking on its ...
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0answers
41 views

Understanding Phase Shift Full Bridge DC-DC Converter

I am studying PSFB DC DC converter. I am a bit confused in understanding the topology. For reference of the functionality I am taking UCC28950 Controller IC's circuit, From TI which have provided in ...
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1answer
21 views

Average Voltage of a 3phase full wave bridge diode rectifier derivation

Why three phase bridge rectified waveform is integrated over the half period \$\pi/6\$\ to find the average voltage? Should it not be integrated over \$\pi/3\$\, as the wave form repeat itself after \$...
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0answers
47 views

Questions regarding Gallium Nitride semiconductor devices in Switched Mode Power Supplies

I have a couple of questions regarding the use of Gallium Nitride MOSFET devices in a DC/DC converter design of mine. My topology is an LCC full bridge converter. My knowledge is not at expert level ...
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2answers
54 views

Half Bridge Low Side Mosfet vs. Flyback Diode

I intend to use this high side switch in a PWM application with a brushed 12V motor drawing 8A steady state max: https://www.nxp.com/docs/en/data-sheet/MC33981.pdf The switch allows for a half bridge ...
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2answers
55 views

Ćuk Converter circuit analysis

I am confused by the current path of the Ćuk converter when it is at position one where the mosfet is conducting The circuit analysis results in the two circuits below. What is the current path? Why ...