The beauty queen
Posted: Wed Dec 18, 2024 3:07 am
Contributors and attributions
John D. Robert and Marjorie C. Caserio (1977) Basic Principles of Organic Chemistry, Second Edition. W. A. Benjamin, Inc., Menlo Park, CA. ISBN 0-8053-8329-8. This content is copyrighted under the following conditions: "Permission is granted for the reproduction, distribution, display, and individual performance for educational, research, and noncommercial purposes of this work in any format."
This factor is a result of the ratio of effective power to apparent power, which falls somewhere between 0 (worst) and 1 (ideal). Therefore, the higher the power factor, the less energy is wasted back to the main grid. Although residential consumers do not have to pay for apparent power, to minimize apparent power usage, the EU standard EN61000-3-2 states that all switched-mode power supplies with an output power of more than 75 W must include a passive PFC converter. In addition, 80 PLUS certification belgium email list requires a power factor of 0.9 or more. A few years ago, many power supply manufacturers used passive PFC in their products. PPFC uses a filter that only passes current at the line frequency, 50 or 60 Hz, so the harmonic current is reduced and the non-linear load is transformed into a linear load. Then, with the use of capacitors or inductors, the power factor can be brought closer to unity. The downside of PPFC is that it achieves smaller power factors than APFC and requires a voltage doubler to make the PSU 115/230V compatible. In contrast, PPFC has a higher efficiency than APFC, which is something most of you probably didn’t know. But that doesn’t mean that PPFC-equipped PSUs are more efficient than APFC ones, as PPFC units are often based on older designs that can’t compete with the performance of modern APFC PSUs.
Practical Application
Active CFP
As the name implies, Active Power Factor Correction (APFC) employs a circuit that actively corrects the power factor. As we just explained, power factor is an important parameter in the world of power supplies, as it describes the relationship between effective power and apparent power:Pros: * An almost ideal power factor close to unity * Very stable current output even under input voltage variations * Demands on smaller parts (transformer)Cons: * Higher initial cost * More susceptible to failure * Power losses occur in the APFC boost diode (and FETs)
John D. Robert and Marjorie C. Caserio (1977) Basic Principles of Organic Chemistry, Second Edition. W. A. Benjamin, Inc., Menlo Park, CA. ISBN 0-8053-8329-8. This content is copyrighted under the following conditions: "Permission is granted for the reproduction, distribution, display, and individual performance for educational, research, and noncommercial purposes of this work in any format."
This factor is a result of the ratio of effective power to apparent power, which falls somewhere between 0 (worst) and 1 (ideal). Therefore, the higher the power factor, the less energy is wasted back to the main grid. Although residential consumers do not have to pay for apparent power, to minimize apparent power usage, the EU standard EN61000-3-2 states that all switched-mode power supplies with an output power of more than 75 W must include a passive PFC converter. In addition, 80 PLUS certification belgium email list requires a power factor of 0.9 or more. A few years ago, many power supply manufacturers used passive PFC in their products. PPFC uses a filter that only passes current at the line frequency, 50 or 60 Hz, so the harmonic current is reduced and the non-linear load is transformed into a linear load. Then, with the use of capacitors or inductors, the power factor can be brought closer to unity. The downside of PPFC is that it achieves smaller power factors than APFC and requires a voltage doubler to make the PSU 115/230V compatible. In contrast, PPFC has a higher efficiency than APFC, which is something most of you probably didn’t know. But that doesn’t mean that PPFC-equipped PSUs are more efficient than APFC ones, as PPFC units are often based on older designs that can’t compete with the performance of modern APFC PSUs.
Practical Application
Active CFP
As the name implies, Active Power Factor Correction (APFC) employs a circuit that actively corrects the power factor. As we just explained, power factor is an important parameter in the world of power supplies, as it describes the relationship between effective power and apparent power:Pros: * An almost ideal power factor close to unity * Very stable current output even under input voltage variations * Demands on smaller parts (transformer)Cons: * Higher initial cost * More susceptible to failure * Power losses occur in the APFC boost diode (and FETs)