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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Relationship between inrush current, blowing the fuse and switching power supplies with PFC
I'm having the problem that my (switching) power supply of my new "mobile workstation" (laptop) is blowing the 230V/16A (about 40 years old) fuse (circuit breaker) most of the time when ...
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Ideal 3 Phase Rectifier [closed]
I am working on a 3 phase PFC and implementing third harmonic injection. In order to do so, I use the min-max method. This would be trivial in an MCU, but everything is being done in analog. I have ...
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Impact of Low Power Factor on Loss Generation in PMSMs
I am focusing on the losses generation in PMSMs and still have some doubts about the role of a low power factor.
For the analysis, I consider a three-phase PMSM controlled with Field Oriented Control (...
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How to reduce notches in input AC voltage for Totempole Power factor Correction circuit?
Respected readers, I am working with a totem pole PFC circuit. In an experimental study, I face a problem of high-frequency notches in source voltage (Yellow one). I found an explanation behind this. ...
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Capacitance for power factor correction formula
I wrote a test the other day and the paper provided a formula for calculating the required capacitance needed for power factor correction. The formula:
\begin{align}
C = \frac{Q_c}{\omega V_{RMS}^2} \...
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Pulse width modulation using ML4800CP
I am working on a SMPS (450 V output). It use an ML4800CP IC to control and manage 450 V DC.
How can I measure the PWM signal using an oscilloscope? I attached it, and it worked well for the PFC ...
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In a PFC boost converter, would input current distortion happen during initial voltage build up- when input is higher than output?
It is said that "Boost DC voltage output must be higher than the maximum line peak voltage otherwise you will introduce distortion (harmonics)"
Shown below is the simulation output for a PFC ...
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How to calculate boost PFC iL, Vout by duty?
When steady state ∆iL - ∆iL‘ = 0 and Vout Vin/(1-D)
∆iL=(Vin/L)･Ton
∆iL‘=((Vin-Vout)/L)･Toff
Vout=Vin/(1-D)
Can I calculate current changes(∆iL - ∆iL‘) during dynamic state by using the same equations?...
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For an active power factor correction circuit (PFC boost,) is there any characterisation graph between input voltage and power factor?
Just like the regulation graph (ouput voltage vs. input voltage) for a voltage regulator, is there a similar graph (power factor vs. input voltage) for a power factor corrector circuit?
My aim is to ...
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Would an AC EMI filter capacitors contribute to inrush current?
Shown below is an EMI filter for an AC input. My doubt is when I analyse the inrush current, should I be considering the contribution due to all three capacitors?
a) Differential mode capacitors
b) ...
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Pulsed current measurement and power factor calculation
I want to measure pulsed current in a 3-phase power meter application. I understand that the waveform will be random, as the current in question is the overall current consumed by different types of ...
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PFC circuit: Rectified AC voltage going beyond input AC voltage limits
We have a PFC circuit powered from a bridge rectifier as shown below:
Fig 1:
We have separate sense terminals to detect the AC voltage levels and accordingly enable the PFC converter (sample circuit ...
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Current sense resistor determination
Please help me understand this PRC circuit of a SMPS.
According to the NCP1606 PFC controller datasheet pin 4 is responsible for current sensing. Now, there are two resistors:
(red) in series to the ...
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Forward biasing of diode bridge in a discontinuous mode operation of a three phase buck-boost derived power factor corrected converter
In this paper, they said that during mode 1 the diode bridge is forward biased because the output capacitor voltage is greater than peak line to line voltage but during mode 2 they are forward biased. ...
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