Active power factor correction

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Topic: Active power factor correction

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	Power Factor Correction Concepts
		Power factor is the ratio of Active Power (W) to the Apparent Power (VA) (Figure 1).
		The leading power factor on the first ballast, in conjunction with the lagging power factor of the second ballast, brings the total power factor to near unity.
		This Apparent Power (VA) has two components; one is the Active Power (W) actually being consumed by the lamp for illuminating it, and the other is the Reactive Power (VAr) feeding the electromagnetic circuit of the control gear.
	www.ambercaps.com /lighting/power_factor_correction_concepts.htm (684 words)

	Power Factor Correction
		Power factor correction is a term applied to the misalignment of the phase angle of the sine wave between input and output voltage and current.
		Power factor does not affect how much "power" - energy - you actually use and the way it's written is misleading, as it seems to say you use less power when you use a PSU with an active PFC.
		It is less powered because the current and voltage phases are not in alignment, thus leading or lagging phases require correcting before they are useful.
	www.overclockers.com /articles613/index02.asp (1014 words)

	Active PFC (Power Factor Correction)
		Active Power Factor Correction also markedly diminishes total harmonics, automatically corrects for AC input voltage, and is capable of a full range of input voltage.
		Because Active PFC uses a circuit to correct power factor, Active PFC is able to generate a theoretical power factor of over 95%.
		Passive PFC uses a capacitive filter at the AC input to correct poor power factor.
	www.endpcnoise.com /cgi-bin/e/pfc.html (295 words)

	Power Electronics Laboratory at UCI
		An active power filter (APF) is a device that is connected in parallel to and cancels the reactive and harmonic currents from a group of nonlinear loads so that the resulting total current drawn from the ac main is sinusoidal.
		One-Cycle Control automatically correct the power switch transient error and conduction error, as a result, no switching component matching is necessary, the output has no cross over distortion, high linearity is achievable.
		A proof concept circuit of full-bridge power amplifier controlled by the Analog Devices ADSP-21020 DSP was built achieving close to 5kHz bandwidth and 60dB ripple rejection at 60Hz.
	www.eng.uci.edu /pel/pel.html (3874 words)

	Power Factor Correction Concepts
		Power factor is the ratio of Active Power (W) to the Apparent Power (VA) (Figure 1).
		The leading power factor on the first ballast, in conjunction with the lagging power factor of the second ballast, brings the total power factor to near unity.
		This Apparent Power (VA) has two components; one is the Active Power (W) actually being consumed by the lamp for illuminating it, and the other is the Reactive Power (VAr) feeding the electromagnetic circuit of the control gear.
	www.ambercaps.com /lighting/power_factor_correction_concepts.htm (684 words)

	Power Factor Correction Capacitors
		Power factor is the relationship between working (active) power and total power consumed (apparent power).
		When low power factor is not corrected, the utility must provide the nonworking reactive power in addition to the working active power.
		By supplying their own source of reactive power, the industrial user frees the utility from having to supply it; therefore, the total amount of apparent power (kVA) supplied by the utility will be less.
	www.galco.com /circuit/harmon.htm (401 words)

	Active PFC (Power Factor Correction)
		Active Power Factor Correction also markedly diminishes total harmonics, automatically corrects for AC input voltage, and is capable of a full range of input voltage.
		Because Active PFC uses a circuit to correct power factor, Active PFC is able to generate a theoretical power factor of over 95%.
		Power Factor Correction (PFC) allows power distribution to operate at its maximum efficiency.
	www.endpcnoise.com /cgi-bin/e/pfc.html (295 words)

	Description of the field of the Research.
		Active power filters, that are used for power factor correction and harmonic suppression of non-linear loads, require measuring and control blocks of a very high performance.
		To study the application of DSP technology in control of power electronic converters with special attention to the generation of the reference signal used in active power filters.
		It has to guarantee the Displacement power factor to be unity and the content of low order current harmonics should be negligible.
	www.eng.um.edu.mt /~peqrg/projects.html (373 words)

	A Primer on Power Factor Correction
		Power factor is the proportion of active power (p) to apparent power (s), as shown in this power triangle.
		This graph of the release of the power system in per-unit of active power in a facility demonstrates that you get the maximum release in those cases where the existing power factor is low and the target power factor is high, such as near or equal to one.
		This graph shows that the greatest reduction of losses in feeders occurs when the original power factor in the facility is low and is improved to (or near) unity.
	ecmweb.com /mag/electric_primer_power_factor/index.html (2586 words)

	Power Factor Correction Concepts
		Power factor is the ratio of Active Power (W) to the Apparent Power (VA) (Figure 1).
		This Apparent Power (VA) has two components; one is the Active Power (W) actually being consumed by the lamp for illuminating it, and the other is the Reactive Power (VAr) feeding the electromagnetic circuit of the control gear.
		The leading power factor on the first ballast, in conjunction with the lagging power factor of the second ballast, brings the total power factor to near unity.
	www.ambercaps.com /lighting/power_factor_correction_concepts.htm (684 words)

	Power Factor Correction Concepts
		Power factor is the ratio of Active Power (W) to the Apparent Power (VA) (Figure 1).
		This Apparent Power (VA) has two components; one is the Active Power (W) actually being consumed by the lamp for illuminating it, and the other is the Reactive Power (VAr) feeding the electromagnetic circuit of the control gear.
		The leading power factor on the first ballast, in conjunction with the lagging power factor of the second ballast, brings the total power factor to near unity.
	www.ambercaps.com /lighting/power_factor_correction_concepts.htm (684 words)

	Power Electronics Laboratory at UCI
		The research in the Power Electronics Laboratory at UCI involves modeling, control, topologies, and integration of switching converters, inverters, class-D power amplifiers, soft switching techniques, single-phase and three-phase power factor correction methods, single phase and three-phase active power filters, power conversion for alternative energy sources, etc.
		An active power filter (APF) is a device that is connected in parallel to and cancels the reactive and harmonic currents from a group of nonlinear loads so that the resulting total current drawn from the ac main is sinusoidal.
		Switching circuits for audio power amplifiers still remain one of the most challenging research topic in the field of Power Electronics, due to the low distortion and high bandwidth requirements.
	www.eng.uci.edu /pel/pel.html (3874 words)

	US06903947-20050607.html
		said first switched-mode power supply comprises a current pump with a coil for an active power factor correction, the coil being coupled to a primary winding of a transformer of said first switched-mode power supply, and
		said second switched-mode power supply comprises a power factor coil in its current supply in order to shift a phase of the pulsed current flow with regard to the maximum of the mains voltage.
		Power supply having a first switched-mode power supply and a second switched-mode power supply, both being connected in parallel supply and both having a common mains voltage connection providing a pulsed current flow, wherein
	www.uspto.gov /web/patents/patog/week23/OG/html/1295-1/US06903947-20050607.html (182 words)

	Ridley Engineering
		The design of an active unity power factor correction circuit with variable-hysteresis control for off-line switching power supplies is described.
		In addition to output voltage and inductor current feedback, a feedback from the intermediate filter stage is employed to optimize the transient response in the event of failure of a converter module, and also to improve the other closed-loop performances of the system.
		A signal proportional to the output-inductor current is compared with an error voltage signal to modulate the switching frequency.
	www.ridleyengineering.com /papers.htm (182 words)

	KEPCO INC: REAL/APPARENT POWER AND POWER FACTOR
		Power supplies with active power factor correction (PFC) include the Kepco ABC (100W), MST (200W), RCW (350, 750 and 1500W), RKW (50, 100, 150, 300, 600 and 1500W), HSP (1000 and 1500W), BOP High Power (1000 and 2000W) and HSM (1000 and 1500W).
		Although the voltage and current are in phase with each other, the power factor can differ from the unity value that two sinusoidal waveforms would produce.
		Real power is mathematically determined by dividing time into a very large number of small segments and multiplying the instantaneous voltage present in each time segment by the instantaneous current flowing and averaging the results.
	www.kepcopower.com /hbkpfc.htm (182 words)

	KEPCO INC: REAL/APPARENT POWER AND POWER FACTOR
		Power supplies with active power factor correction (PFC) include the Kepco ABC (100W), MST (200W), RCW (350, 750 and 1500W), RKW (50, 100, 150, 300, 600 and 1500W), HSP (1000 and 1500W), BOP High Power (1000 and 2000W) and HSM (1000 and 1500W).
		Since power factor represents the ratio of real to apparent power, the high apparent power that yields a low power factor translates into a higher current than the load actually needs to satisfy its real power requirement.
		Although the voltage and current are in phase with each other, the power factor can differ from the unity value that two sinusoidal waveforms would produce.
	www.kepcopower.com /hbkpfc.htm (1863 words)

	PC Perspective - Three Seasonic ATX Power Supplies Reviewed
		Each of the power supplies tested include active power factor correction and produced some of the highest efficiencies I have measured to date.
		Today, Seasonic offers a full line of switching mode power supplies that are well suited to the PC enthusiast market and backed by a 3-year warranty.
		On the down side, none of the three Seasonic power supplies came with serial ATA drive connectors or even adapters.
	www.pcper.com /article.php?aid=35&type=expert&pid=11 (395 words)

	Active PFC (Power Factor Correction)
		Since Active PFC is the more complex method of Power Factor Correction, it is more expensive to produce an Active PFC power supply.
		Because Active PFC uses a circuit to correct power factor, Active PFC is able to generate a theoretical power factor of over 95%.
		Passive PFC uses a capacitive filter at the AC input to correct poor power factor.
	www.endpcnoise.com /cgi-bin/e/pfc.html (295 words)

	PCA Electronics, Inc.
		PCA introduces two NEW series of Active Power Factor Correction (PFC) Boost Inductors for use in CCM or DCM modes.
		PCA offers a wide variety of power input/output inductors, switching transformers, and power input and output common mode filter/chokes to reduce EMI.
		PCA introduces a NEW series of very small Power over Ethernet (PoE/Powered Devices).
	www.pca.com (393 words)

	www.ramtechno.com
		RAM's proprietary Active Power Factor Correction design with DC to DC pulse width modulation boosts the input power factor to a typical.99.
		At the core of RAM power supply designs is the exclusive MultiLoop Technology utilizing high efficiency voltage converters.
		With RAM as a partner you can speed up time to market...RAM OEM customers have the added advantage of our engineering expertise and 30 plus years of experience.
	www.ramtechno.com (318 words)

	Eurocard - a reference guide from Engineeringtalk
		Take a look also at the news release from OKW Enclosures, Eurocard cases in aluminium introduced, as well as Desktop or wall mounting single Eurocard enclosure from OKW Enclosures, and Eurocard PSU with active power factor correction from Ferrus Power.
		Start with the news release DSP-based stepper drive in Eurocard format from Smartdrive, which we summarised at the time by saying "The T-Series is a novel Eurocard implementation of the Smartdrive Taranis ultra-smooth DSP-based microstepping drive/controller.".
		We see from your search that you're looking for information on the term "Eurocard", and we have a large number of manufacturers' news releases and technical articles here on Engineeringtalk which will be of interest.
	www.engineeringtalk.com /guides/eurocard.html (287 words)

	!ATX2.03 version1.3, EPS12V AMD Athlon-XP/MP/SP, ATX-p4 Power Supply!
		Excellent energy saving for high level active PFC (Power Factor Correction) value at >=0.97.
		Optional multi-platform ATX motherboard connectors are available for those who wish to handle different types of ATX motherboard connectors (such as Intel, Super Micro, Iwill, Tyan, MSI server motherboard).
		All of our ATX power supplies are compliant with EMC and Safety Standards such as UL, CSA, UL+C, TUV, CE, FCC, VDE, NEMKO, SEMKO, DEMKO, FIMKO, CNS.
	www.amtrade.com /pc_power/p4_atx_power_supplies.htm (296 words)

	Active Power Filters Provide a Cost- Effective, Flexible Solution for System Harmonic Control
		Because APF correction is accomplished parallel to the AC line, it only needs to correct for the combined reactive currents, which may be as little as 15 to 20% of the actual load in the same 1,000 W system.
		For existing nonlinear loads, near unity power factor can be achieved by simply connecting an APF device in parallel with the AC inlet.
		This reduces the percentage of current that must be injected by the APF to cancel reactive currents, and results in efficiencies that may exceed 95%.
	www.nasatech.com /Briefs/july04/ECC0704.html (930 words)

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Topic: Active power factor correction

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