A PFC Power Supply with Minimized Energy Storage Components and a New Control Ttechnique for Cascaded SMPS (original) (raw)
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This paper presents a new dual switch control structure for an AC/DC non-inverting cascaded buck-boost power factor correction converter. The proposed converter operates at a discontinuous capacitor voltage mode providing an inherent high power factor and a zero voltage turn-off switching. Additionally, the proposed control structure enables for a non-distorted sinusoidal current for a wide range of output voltage levels. Unlike the conventional methods, a mode detector is not required and consequently there is no hard transition between buck and boost modes. Although both converter switches are controlled, only one feedback control loop is required to obtain the desired power flow at a unity power factor. The principle of operation, theoretical analysis, simulation, and experimental results of a 1.6 kW prototype grid connected converter are presented. The results confirmed the validity of the proposed system under various operating conditions.
New Power Factor Correction AC-DC Converter With Reduced Storage Capacitor Voltage
IEEE Transactions on Industrial Electronics, 2000
Most of single-stage power factor correction (PFC) ac-dc converters usually present a high voltage swing on the storage capacitor. That means, high size and cost of the storage capacitor is obtained. The Series Inductance Interval (SII) PFC converters allow reducing cost and size of the storage capacitor since the capacitor voltage is lower than the output voltage and, therefore, the voltage swing is significantly reduced. In this paper, the novel single-stage SII-B-2D PFC converter is presented. In addition, this topology provides input current harmonics under EN61000-3-2 Class D limits and advantageous component count.
Review of AC-DC power electronic converter topologies for power factor correction
International Journal of Power Electronics and Drive System (IJPEDS) , 2019
Increased harmonic content and low power factor in power systems caused by power converters have been of great concern. To overcome this, several converter topologies employing advanced semiconductor devices and control schemes have been proposed. The aim of this paper is to identify a low cost, small size, efficient and reliable ac to dc converter to meet the input performance index of uninterrupted power supply. In this paper, comparison between three converters namely AC-DC Cuk rectifier, Fly back converter & Interleaved SEPIC converter have been carried out. For the above converters both bridged and bridgeless topologies have been analysed. The working of all the three types of converter has been illustrated with relevant waveforms followed by the simulation results. Comparison of the three converters have been done based on the parameters namely Displacement Factor, Supply Power Factor& supply THD. The results are verified.
A review on Buck topology-based PFC Conversion Techniques
2020
Along with benefit of effective control over many applications power electronics converters have become the building block in various applications like SMPSs, UPS, integration of renewable energy resources with conventional systems and much more. Although with this easiness and control there comes power quality issues like voltage flicker, voltage distortion, harmonic current and of course poor power factor hence increasing the cost. Traditionally, diodes and thyristors perform the action of ac-dc conversion, providing controlled and semi controlled dc output with unidirectional and bidirectional power flow. Although, they hold the disadvantages of increasing the size of circuits, poor power quality injecting current harmonics, voltage distortion, low power factor at input ac mains with slow changing rippled dc output at load end. PFC converters provide fast dynamic response, reasonable power quality, high PF and output voltage. But as these converters are not ideal so power quality problems associated with these converters can be eliminated to a limit standardized by IEEE and IEC [1-3]. For low power and lightning application reasonable voltage regulation and high PF is required. This problem is overcome by using various active PFC controllers. The basic circuit of PFC converter is shown in figure.1 with help of this configuration unity PF and reasonable voltage regulation is achievable. This approach is called two stage approach, obviously the power stage goes through two conversion process which heavily penalize the efficiency and cost for low power application. AC supply Bridge Diode EMI Filter PFC Block Control Block DC-DC Converter Control Block Figure. 1 basic PFC converter However, these converters provide reasonable advantages in terms of the following reasons. i. These converters guarantee the compliance of any regulation as they provide sinusoidal input line current. ii. For universal line voltage it gives great performance. iii. It provides variety of options to carry out both the isolation between line and load, and the holdup time. iv. The performance penalty due to the double-energy processing is partly mitigated by the reality that voltage is regulated on the storage capacitor.
Variable-Duty-Cycle Control to Achieve High Input Power Factor for DCM Boost PFC Converter
A discontinuous-current-mode (DCM) boost power factor correction (PFC) converter features zero-current turn-on for the switch, no reverse recovery in diode, and constantfrequency operation. However, the input power factor (PF) is relatively low when the duty cycle is constant in a half line cycle. This paper derives the expressions of the input current and PF of the DCM boost PFC converter, and based on that, variable-duty-cycle control is proposed so as to improve the PF to nearly unity in the whole input-voltage range. A method of fitting the duty cycle is further proposed for simplifying the circuit implementation. Other than a higher PF, the proposed variable-duty-cycle control achieves a lower output-voltage ripple and a higher efficiency over constant-duty-cycle control. The experimental results from a 120-W universal input prototype are presented to verify the effectiveness of the proposed method. . His main research interests include soft-switching dc/dc converters, soft-switching inverters, powerfactor-correction converters, modeling the converters, power electronic system integration, and renewable energy generation system. He has published over where he is currently with the Power SBG ATD-NJ R&D Center. His research interests include high-density high-efficiency power supply for computing, communication, and consumer electronics applications, digital control, power converter topologies and controls, softswitching techniques, etc. He is the holder of seven U.S. patents and has published more than 30 technical papers in TRANSACTIONS and international conferences.
Design of an Integrated Power Factor Converter with PI Controller for Low Power Applications
In this paper, an integrated power factor converter with PI controller is proposed. The circuit topology is obtained by integrating two converters namely the buck converter and a boost converter. The boost converter is normally a step up converter which obtain an unity power factor and performs low harmonics at the input. Based on the simple circuit topology and easy control the boost converter or buck-boost converter is used as power factor correctors. Similarly the buck converter regulates the dc-link voltage and provide a stable dc output voltage. To achieve unity power factor, the output voltage of both converter should be higher than the amplitude of the ac line voltage. The steady-state analysis is developed and a design is provided.
International Transactions on Electrical Energy Systems
This paper proposes a high step-down ratio AC-DC converter employing a quadratic buck converter with power factor correction. Conventional active power factor correction topologies employ boost-based correction schemes for unity power factor operation. This will require a steeper step-down ratio and higher switch voltage stress apart from complexity in the control scheme with sensors. The structure of the proposed topology is developed by combining the power factor correction stage with a high step-down stage. The passive input filter is split up into two for the purpose of reducing the thermal heating apart from offering a higher power factor. A single switch operation reduces the complexity of the control scheme. In addition, the number of conducting devices during the current path is also the same as the conventional buck converter due to cascading and hence offers lower conduction losses. The need for the converter to operate at an extremely low duty cycle is reduced due to the ...
2017 IEEE Applied Power Electronics Conference and Exposition (APEC), 2017
This work analyzes different options to implement low power consumption in Switching Mode Power Supplies (SMPSs) with Power Factor Correction (PFC) when they are in standby mode. The standard SMPSs for power levels higher than 100 W are made up of two stages: a classical PFC stage based on a Boost Converter operating in the Continuous Conduction Mode and a second stage based on any type of isolated DC-DC converter. The value of the resistive sensors needed by the PFC control stage determines a standby consumption higher than 0.5 W if the power supply has to be designed to operate in the Universal Range of line voltages. This fact makes it very difficult to comply with European Ecodesign Regulations. To overcome this problem, several solutions are proposed and analyzed in this paper, the most promising being implemented in a real SMPS prototype.
A novel integrated SMPS with battery backup and power factor correction
Proceedings of Intelec'96 - International Telecommunications Energy Conference, 1996
Uninterruptible energy is highly appreciated in applications such as personal computers, medical equipment, workstations, portable measurement equipment, and others. Besides, the appearance of standards about the quality of demanded line current for this equipment has been the cause of development of new power supply schemes capable of integrating battery backup and power factor correction in simple structures which offer both, low cost and size alternatives. This paper describes a novel and simple structure which offers power factor correction and battery backup capability. The proposed structure has excellent characteristics in terms of cost, size and efficiency, taking into account the reduced number of components. Experimental results of an experimental prototype of the proposed converter are included too.
Single-switch power factor correction AC/DC converter with storage capacitor size reduction
IEEE 34th Annual Conference on Power Electronics Specialist, 2003. PESC '03., 2003
In universal line applications with holdup time requirement, the single-stage PFC ACIDC converters may not be more attractive than the conventional two-stages approach if the size and cost of the storage capacitor are too high. Furthermore, computer related applications, in which the holdup time is a very important requirement, will have to comply with Class D limits of the low frequency harmonic regulation IEC 61000-3-2. Therefore, for these applications, a not very distorted line current will be required. In this paper, a new single-stage ACBC converter suitable for universal line applications is proposed. The main difference with other solutions is the low voltage swing on the storage capacitor while the line varies within its universal range. This feature allows reducing the size and cost of the storage capacitor. Additional advantages of the proposed converter are topology simplicity (single-switch converter) and IEC 61000-3-2 Class D compliance. The experimental results confirms the above mentioned advantages.