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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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9 views

Maximum current rating of resistor

I have a fusible resistor 3.3 ohm ,2 watt In some situation resistor will damaged. How can I calculate the maximum current a resistor can handle with a safe limit?
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2answers
48 views

24v dc High current variable speed Voltage regulator

I’m in need off a high current voltage regulator. I know a little about electronics, but not on an engineering level of designing stuff. I have a few stuff on scrap boards that I can use that lying ...
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177 views

Problem in capacitor size on PCB

I have a PCB circuit where I want to include a 4.7 µf 400 V capacitor but it's big in size, so the PCB looks bulky. Could you please suggest some other package smaller in size? The figure ...
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2answers
26 views

Extracting information from inductance matrix

I have a 7*7 inductance matrix that looks like Where M represents the mutual inductance of two inductors and L represents the self inductance of an inductor. The goal is to find the coupling ...
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1answer
49 views

What happens when a 4-20mA sensor is connected in reverse to receiver?

simulate this circuit – Schematic created using CircuitLab I need to build a 4-20ma to 1-5v converter circuit. I have a working model with a 24v supply and a 250 ohm resistor. Now I need to ...
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1answer
23 views

Correct Thyristor IV characteristics

I saw two different IV characteristics of thyristor on the net. First: Second: So far I know, that when the voltage reaches breakdown value, the avalanche breakdown happens in the thyristor ...
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1answer
25 views

Voltage line switcher?

If I have two voltage lines, say 5V and 12V, and I want to switch between using these two, is there such a device that can be controlled to connect one line, then connect the other? I was thinking of ...
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3answers
65 views

How can I control TRIAC firing angle automatically with a DC voltage?

I have to build an analog proportional controller for a 127 V, 1 kW AC heating resistance. The power delivered to the heating element must be proportional to the difference between a set point ...
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1answer
42 views

Should I tie my various DC power supply 0 V rails to ground?

I'm putting together the controls for a CNC router table I'm building. In the enclosure I've got some DIN rail power supplies, contactors, and terminal blocks. Also in the enclosure is the VFD for ...
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1answer
87 views

Buck-Boost converter without low side switch

Please look at the buck -boost converter below. It is 2 outputs, one buck and one boost output. Would the circuit work as describe in the picture? In what condition the circuit will it work? If so how ...
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1answer
115 views

Help me identify power issues with this PCB

I bought the following UPS module for my Raspberry Pi: Power Pack Pro The module kinda works, when I unplug the power cable, the module instantly switches to battery powered mode without restarting ...
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1answer
28 views

LTC7813 buck-boost IC max output power

I am developing a power supply for a 24V 10A BLDC motor, which has to work with car and truck batteries (12V-24V). The real thing is that those batteries never have 12V nor 24V, instead, they could be ...
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2answers
69 views

How can I get FROM and TO times of trig on measure statement of LTSPICE?

I need to measure the voltage on two signals which have a difference of phase, so in order to do the measure that I need I have to get V1 (t) and V2 (t + delay_between_signals). One way to that is by ...
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35 views

How to choose a DC-DC Converter for a motor with inrush current? (Theory)

I am wondering how to choose a DC-DC converter for a motor. This is a theoretical question for understanding. For example, if I have a converter that can output 5V with a maximum current of 1A. ...
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1answer
44 views

Why fast inner current loop and slow outer loop of DC-DC converter

Let say we have a DC-DC converter operates with double loop control (inner and outer) , and with switching frequency of Fs= 20000 Hz. Please ,if you could answer the two following questions: 1- ...
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0answers
52 views

Volt knob with consistent current

I need a device that can maintain the current of an variable electrical signal while manipulating current and overall power. Example 10a 0-24v 0-240w. And the theory behind a device which will work ...
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2answers
44 views

Backup power supply using capacitors to help esp8266 run for 3-4 seconds after power failure [closed]

I need to make a circuit with introduction of capacitors in parallel with input supply of esp8266(3.3Vdc) to run it extra 3-4 secs after power failure, Is it possible to gain extra 3-4 secs just ...
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1answer
71 views

Is Inductive Kickback Protection not necessary for AC?

For DC inductive loads, typically a flyback diode is placed over the motor so that when the current changes instantaneously it doesn't have a chance to build upon the switch contact and then create a ...
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0answers
46 views

What component is best for a voltage follower amp (specs given in question)?

I am wanting an op amp that can act as a voltage follower. Essentially the project is speed control of a motor and since PWM is being used, the following circuit was going to be implemented: ...
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1answer
91 views

What chips can be used to design an Anti-Counterfeit /Authentication circuit? [closed]

I am an intern within the R&D branch of a company that designs tools that must operate with low noise at extremely high external temperatures (upwards of 175C). My boss asked that I look into ...
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2answers
42 views

Inrush Current effect on a Relay

I am confused about inrush current for a relay. For example, if I had 12A as the inrush current due to a motor, if the contact rating of a relay is only 6A, does a new relay need to be chosen? As in ...
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0answers
34 views

high power servo motor for an automotive enviroment [closed]

As you know already most high power servo motors in the range of 1.5Kw to 3KW and their respective drivers are AC powered and come mostly in 3phase for reasons beyond the scope of the question. But ...
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2answers
50 views

SVPWM: Does setting modulation index to 0 still consumes power?

I've implemeneted a 3rd harmonic injection SVPWM (Space Vector PWM) scheme and it performs quite well. One peculiarity i have noticed was, when i set the modulation index to 0, the motor stops as ...
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1answer
38 views

Measure Power Consumption of Battery Charger?

I want to ask how to measure power consumption of battery (Li-On 18650) charger module (TP4056 and USB Boost) and the total power consumption, if i have this circuit: I have already know the power ...
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2answers
57 views

How to extract minimum supply voltage from the datasheets

I am relatively new to electronics and need to know What is the minimum supply voltage (Vcc) for LM1875 and for LF347 and how do I extract it from the datasheets? In LM1875 it is written that the ...
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1answer
60 views

Questions about Inductive Kickback and what causes an inductor to discharge?

This is most likely a dumb question, just for some reason I have just forgotten the fundamentals about how charging and discharging work. Essentially my question is for this simple circuit: When the ...
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1answer
48 views

Compensated vs uncompensated Op Amps [closed]

What are the advantages/disadvantages of compensated and uncompensated op amps? Thank you in advance.
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1answer
23 views

Pulse frequency modulation mode in buck converter MAX15062

I am modelling MAX15062 DC-DC buck converter using datasheet in PSpice, initially i worked on control loop. This buck converter has two modes PWM and PFM mode. With MODE pin unconnected works on PFM ...
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2answers
157 views

Why don't they use more than 12v in high power car audio?

In every single high-powered car audio system I've seen, in person and on the internet, the amplifier has been run off of the main 12 volt power system. Such systems feature multiple parallel runs of ...
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1answer
63 views

How to calculate gate charge time for a mosfet?

I am designing the circuit shown above using mosfet NDS355AN. MCU is 5 V. However, I have become stuck as I am unsure of how to calculate the gate charge time of the mosfet. Hence what is the formula ...
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0answers
38 views

How to account for the low voltage when designing a Step Down Switching Regulator

Datasheet: http://www.ti.com/lit/ds/slvs569f/slvs569f.pdf Design procedure: **Essentially my question is say I have an input voltage that can range from 7-15V. When designing this converter (must ...
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1answer
32 views

PV battery connection

1)What happen if a PV array of 30 Vmp is connected to a 12 volt battery(lead acid)? 2)Do i need a buck converter to 12 volt between the pv array and the battery to connect them together?
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1answer
35 views

SiC Avalanche Voltage

It has been mentioned in some articles that, in SiC (silicon carbide) diodes, as the temperature increases, avalanche voltage decreases and leakage current increases. What exactly does that mean?
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2answers
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If a short circuit occured across the mosfet would anything happen in this scenario?

I am just confused about understanding a simple concept. For the following circuit: Say the blue line acts as a short for whatever reason. If the LED has a forward voltage drop of 23 V and forward ...
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2answers
52 views

high voltage coil protection with epoxy resin [closed]

I have a high voltage cylinder coil with iron core. I want to protect it with epoxy resin. What is a good and easy way to do it for single use in a lab environment? What are the pitfalls?
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0answers
53 views

Tesla Coil / Slayer Exciter won't work

I need some help with troubleshooting a slayer exciter circuit or coils. I was following this youtube tutorial and doublechecked all the connections. The power supply I use is 12V 1.5A. My secondary ...
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0answers
27 views

How to design a feedback system for pulse generation in split-pi converter?

How do I design a split-pi converter with feedback and simulate it in Matlab? The main difficulty is in designing a feedback system that will compare the output of the converter with the reference ...
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2answers
31 views

Noise testing method

I have Electronic board with power supply , control board etc. I wanted to conduct noise test . Is there any standard procedure available. I wanted to check if i induce the noise into power line or ...
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2answers
52 views

Confused on when to use RMS current or voltage in calculations (regarding rectifiers)

For question a, why is the power absorbed by the DC source : P=Vo*Io However, for the same exact question, the power absorbed in the resistor is P = (Irms)^2 * R Hence when do we use RMS current/...
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0answers
26 views

(Very Basic) Confused on Reading a Datasheet and Calculating Inductor Ripple Current for a switching Regulator

I am using this component for a project, however, when reading the datasheet I have just become confused about a couple of things. Datasheet : http://www.ti.com/lit/ds/slvs569f/slvs569f.pdf I am ...
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1answer
39 views

Buck Converter - Closed Loop - Effect of decreasing inductance and increasing capacitance

Output voltage as a function of output current is plotted from oscilloscope data for a closed loop buck converter. Switching frequency is kept the same in both the cases. CASE 1 : Inductance = 2....
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0answers
40 views

Buck Converter MOSFET Output Voltage distorted (PWM)

The input to my buck converter MOSFET switch is a PWM signal with a certain duty cycle. However, upon observing the voltage waveform of the MOSFET, the voltage is a bit distorted. The input to ...
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4answers
1k views

PWM 1Hz on solid state relay

I'm about to build a pid heating controller with a 1kW heater and a solid state relay. The ESP8266 can go down to 1Hz pwm frequency. So hopefully I can vary the number of active cycles per second, ...
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1answer
47 views

Powering a compressor for an air horn

I am trying to build a circuit to power a compressor that blows an air horn: I put my DC power supply directly on the positive and negative ends of the compressor and while it does turn on, it most ...
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2answers
49 views

Altium 19 stack manager and Gerber file setup

I have installed Altium Designer 19 recently but I have two problems with this version: First of all, when I open the layer stack manager I can not see "save and load and advance" at bottom. I don't ...
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2answers
40 views

Isolated Power Supplies for Inverter Gate Drivers

I am using a 3-Phase IPM IGBT Inverter Module in motor driver. This module has built-in gate drivers which require 4 Isolated power supplies for their operation. In all I have to design 5 Isolated ...
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1answer
55 views

Brake Resistor in Regenerative Case for Elevator

I am trying to understand the switching pattern of Inverter and the Brake chopper while a 3-phase AC motor is in regenerative mode for example in Elevator case: When its Cabin is full and it is ...
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0answers
48 views

Not understanding current direction for this specific circuit (very basic question)

For the following circuit, I am for some reason just having troubles with understanding why the current (circled blue) moves in the up direction across the capacitor. Or for example, this following ...
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1answer
46 views

How to rapidly switch polarity of two plates?

If I have two metal plates, with P1 connected to V+, and P2 connected to GND, how can I alternate the polarity of these two plates? I wish to have P1 connected to GND, and P2 connected to V+. Then ...
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2answers
62 views

Harmonics in power system [closed]

I have seen in some text books that power converters produce harmonics in power systems. How do power converters inject harmonics in a power system?