# Questions tagged [power-factor-correction]

A circuit that compensates the reactive characteristics of a load to make behave as close as possible to a resistive load in order to maximize the power consumption efficiency.

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1answer
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### Vienna rectifier Matlab simulation

I am trying to simulate the following case: A three-phase source in a Matlab is connected to a Vienna Rectifier which is supposed to supply power to a resistive load of 50KW. Output DC voltage to be ...
0answers
31 views

### Does active power factor correction help with internal radiated/conducted noise?

I am choosing parts for the supply of a device. The case will be a metal chassis and there will be an AC-DC (12 V) converter module inside mounted on the chassis. The total AC power draw will be less ...
1answer
34 views

### Generator Power factor Calculation with varying Output Power

We are operating a generator (Stirling engine in particular) that outputs a certain active power in the range of 6.5-8.9 kW. The power output is adjusted with pressure variation. The electrical ...
0answers
46 views

### Boost PFC Control

I am learning the Boost PFC control, and I read this Master thesis and I have some questions I want to ask you guys. 1.)In the PFC control why we need to multiple 1/x^2, can someone tell me? I think ...
1answer
55 views

### Current sensing in boost PFC controllers

I was going through the datasheets of a few active PFC controller ICs (like this: https://www.ti.com/lit/ds/symlink/ucc28019a.pdf?HQS=dis-mous-null-mousermode-dsf-pf-null-wwe&ts=1619350669153&...
0answers
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### Boost PFC with large leakage inductance

I would like to implement a boost PFC stage for an alternator that has a large leakage inductance (~40mH). When looking at the schematic, we can see that the boost inductance ...
8answers
1k views

### Need device with poor power factor

I'm looking to calibrate an energy meter. As a part of that process, I need to cheaply find a device that can create a power-factor of 0.5, in order to calculate the required phase correction. The ...
0answers
29 views

### PFC formula for calculating conduction losses across MOSFET

I am not able to demonstrate the formula above where Vin is the input voltage of the PFC, Vout is the output voltage, Po is the output power, and Rds(on) is the on resistance of the mosfet. This ...
1answer
53 views

### Power factor requirement for SMPS just above 75W

What is the power factor (PF) requirement for an SMPS or even just a standalone power factor correction (PFC) stage with a power level above 75W? I know that in some cases the customer will specify ...
0answers
26 views

### Inaccurate differential voltage measurement

I tested 3-level PFC voltage initialization event in practice using 1 x single ended probe to measure the output voltage as well as 3 x differential probes to measure the precharge voltage levels of ...
2answers
59 views

### Current values after power factor correction

I am a student tasked with correcting the power factor of an RC circuit to unity with a parallel inductor... Vrms = 240V, 50Hz R = 12ohm C = 220uF. I have calculated the inductor value by calculating ...
1answer
61 views

### Why shouldn't I use a Zobel network to improve the power factor of an electric motor?

This is a homework question, so I would prefer something that would make me think and maybe promote discussion. I understand the use cases for a Zobel network in an audio setup, but I struggle to see ...
2answers
63 views

### Finding the kVA loading after improving the power factor

This is a homework question I've been attempting. But the answer I get doesn't match with whats given and I don't understand why my method is wrong. This is the question with answers. Here's what I'...
1answer
59 views

### Calculating PF of a transformer

Consider a one-phase transformer rated at 20 MVA, 13/2 kV and 50 Hz. It goes through a short-circuit test with |V1|=11 kV applied on the primary side. During the test, the primary side draws rated ...
0answers
20 views

### When changing rotor current in alternators, the pf and inductive part of the current changes but the resistive part does not. Why is this so?

Given a current for an alternator $I = I_R - jI_X$ When the rotor current changes, the excitation changes so the magnitude of the generated voltage changes. The current changes, but only the ...
0answers
119 views

### Impact of PFC output impedance on the regulation of a converter

I have determined the transfer function of my converter operating in closed loop configuration. Nevertheless I saw on the web that the transfer function is not the same if my converter follows a PFC. ...
2answers
31 views

### Formula for non - active power of capacitors connected in a star?

There is a common question in my coursework that we are asked to : Let's say we have an inductive 3 - phase load that consumes $$S=15 + j10$$MVA "If , we connect parallel to this load, 3 ...
1answer
44 views

### High power factor but maximum current at resonance in series RLC circuit

In a series RLC circuit, at resonance, the power factor is unity but the current is high. But since in high power factor the current drawn is low, then isn't this a paradox? High current is ...
0answers
51 views

### Is my solution to this power factor question correct?

I'd be very thankful if it would be possible for someone to check my solution to this question and highlight any mistakes which I may have made in the working. I have checked through it myself several ...
2answers
56 views

### Power factor in a power system

Will a system necessarily have an increase or decrease in power factor with a change in frequency of the system?
1answer
82 views

### How can Kill-a-watt show .1A, 12VA, but 0 watts?

I'm trying to verify whether a 10W aquarium heater is failing. It has a safety fuse that renders it permanently inoperable if it overheats by running unsubmerged, which is suspected in this case. My ...
0answers
19 views

### 3 phase 208v leg balance and observed KVA

I have a cluster computer system in a small server room, fed by an 80 kva capable double conversion (480v 3-phase in, 208v single phase out) UPS. This UPS has an LCD display showing voltage, leg ...
0answers
24 views

### Finding the capacitor value for power factor correction

I know the formula of how to find the capacitor value but id need to find the supplies value first and I don't know how to do that. I have the Is=21.60A and phase angle=43.95. question: A recent ...
1answer
81 views

### How can a boost PFC (Vienna rectifier) lower the voltage?

I found a Vienna rectifier circuit as a PFC. Output range: +350...+500VDC and -350...-500VDC. Input: 400VAC (three phases). To begin with, I simulated a basic three-phase rectifier: Here's the 561V ...
1answer
119 views

2answers
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### Pump power factor OK on mains, but low on generator

I'm working on a submerged pump application, running on 415V three-phase. I don't know for sure, but I believe the pumps are only a few KW. The customer is saying that the pumps run fine when the ...
3answers
413 views

### What's the role of the capacitors in this AC circuit?

I've been around electronics for a lot of time but I really didn't understand how capacitors work in an AC or DC circuits. I know capacitor has a big role in smoothing the output of bridge rectifier. ...