A single-stage single-switch electronic ballast with active power factor correction is presented in this study for CFL applications. Unlike other single-switch ballast circuits, the presented integrated dual-boost converter circuit can produce a symmetric bipolar square-wave voltage, thus generating a ...
Power factor correction circuit optimization within the modern SMPS (switch mode power supply) units could evolve in the recent past due to the advent of a number of advanced relevant integrated circuits (ICs), which has made possible to lay down different PFC designs having specific modes of op...
An apparatus and method provides a driver circuit that provides for power factor correction (PFC) to a load, such as a solid-state lighting (SSL) device, such as, for example, a light emitting diode (LED) or an array or cluster of LEDs. A programmable reference is provided in the circu...
For example, fluorescent lights in commercial buildings, which are inductive loads, can cause a lagging power factor, leading to increased demand charges from the utility company and reduced electrical system efficiency. To correct this, capacitors are installed in parallel with the lighting circuit....
PURPOSE: A power-factor improving circuit of an electronic stabilizer for a fluorescent lamp is provided to control power and automatically improve power-factor according to the number of a fluorescent lamp lit by a resonance inductor or a transformer of a stabilizer using a resonance-typed inverter...
The power supply uses current feedback to adjust power to the LEDs and provides protection against open circuits and circuit malfunctions. A current controller compares sensed current to a reference current and generates a feedback signal, which is processed by a power factor corrector to adjust ...
A Family of Zero-Voltage-Transition Bridgeless Power-Factor-Correction Circuits With a Zero-Current-Switching Auxiliary Switch A novel zero-voltage-transition high-efficiency bridgeless power-factor-correction (PFC) circuit with a zero-current-switching auxiliary switch was propose... HY Tsai,TH Hsia,...
Power factor = real power / apparent power The PF value is always between 0 and 1. Most circuits aim for a PF greater than 0.9. A standard power supply has a PF of 0.70-0.75, but a power supply with PFC has a power factor of 0.95-0.99. Many countries now regulate the acceptable...
PowerFactor=WattsVolts×Amperes For the three-phase circuit, the formula is modified to PowerFactor=WattsVolts×Amperes×1.73 Circuits having poor power factor will also operate at a lower efficiency than those with a high power factor. Power factor will be discussed in greater detail inChapter 9...
Power in Resistive and Reactive AC circuits True, Reactive, and Apparent Power Calculating Power Factor Practical Power Factor Correction Vol.Alternating Current (AC) Chapter 11Power Factor PDF Version As was mentioned before, the angle of this “power triangle” graphically indicates the ratio between...