Query: A unity power factor converter using Half Bridge Boost topology

Candidate papers:

abstract: A single phase high efficiency near unity power factor (PF) half bridge boost converter circuit, which has been proposed earlier by other researchers, is presented with detailed analysis. This converter is capable of operating under variable PF. However, the focus of this paper is in achieving unity PF operation only. The efficiency of this circuit is high because there is only one series semiconductor on state voltage drop at any instant. The existence of an imbalance in the voltages of the two DC link capacitors, which was noted before, is confirmed here. The cause for the imbalance is analyzed using appropriate models, and a control method to eliminate it is discussed in detail. Analysis and design considerations for the power circuit using the fixed band hysteresis current control (HCC) technique are provided. The analytical results are verified through simulation using switched and averaged circuit models of the scheme and also through experimental work. At 90 V AC input and 300 W 300 V output, the experimental prototype demonstrates an efficiency of 96.23% and a PF of 0.998. This converter, with its relatively high DC output voltage, is well suited for the 110 V utility supply system. A circuit modification for universal input voltage range operation is also suggested.
author_names: R Srinivasan

Ramesh Oruganti
title: A unity power factor converter using half bridge boost topology
year: 1998

abstract: A single phase, high efficiency, and near unity power factor half bridge boost power converter circuit, which has been proposed earlier by other researchers, is presented with detailed analysis. Though this power converter is capable of operating under variable power factor, the focus of this paper is in achieving unity power factor operation only. The efficiency of this circuit is high because there is only one series semiconductor on state voltage drop at any instant. The existence of an imbalance in the voltages of the two DC link capacitors, which was noted before, is confirmed here. The cause of the imbalance is analysed using appropriate models, and a control method to eliminate it is discussed in detail. Analysis and design considerations for the power circuit using the fixed band hysteresis current control technique are provided. The analytical results are verified through simulation using switched and averaged circuit models of the scheme and also through experimental work. At 90 V AC input and 300 W, 300 V output, the experimental prototype demonstrates an efficiency of 96% and a power factor of 0.998. This power converter, with its relatively high DC output voltage, is well suited for 110 V utility supply system. A circuit modification for universal input voltage range operation is also suggested.
author_names: R Srinivasan

Ramesh Oruganti
title: Analysis and design of power factor correction using half bridge boost topology
venue: Proceedings of APEC 97 Applied Power Electronics Conference
year: 1997

abstract: In this paper, a single phase Power Factor Corrector (PFC) based on a two switch asymmetric half bridge Boost converter is analyzed. This topology improves the source current shaping by avoiding the control detuning phenomenon from which suffers the conventional single switch boost PFC, especially at very low input voltage. Pulse Width Modulated (PWM) multi loops control schemes are proposed and developed in order to ensure a unity power factor at the AC source side and a regulated voltage at the DC load side. The first one uses the simple and robust hysteretic based controller; the second one employs a conventional PI regulator, whereas the third one is based on the model nonlinearity compensation approach. The design of the last two control methods is based on the state space averaged model of the converter. The performance of the different control strategies is evaluated through simulations carried out on a numerical version of the converter. The implemented model of the converter is obtained by using the switching function technique. The control system is tested under both rated and disturbed operating conditions. The system performance is evaluated in terms of source current Total Harmonic Distortion (THD) input power factor and DC voltage regulation.
author_names: Hadi Youssef Kanaan

Kamal Al-Haddad

Maurice Fadel
title: Modeling and control of a two switch asymmetrical half bridge Boost Power Factor Corrector for single phase rectifiers
venue: 2013 IEEE International Symposium on Industrial Electronics
year: 2013

abstract: Digital Simulation and implementation of a Power Factor Correction (PFC) half bridge converter based adjustable speed voltage controlled VSI fed PMBLDC motor is presented in this paper. A single phase AC DC converter topology based on the half bridge converter is employed for PFC which ensures near unity power factor over wide speed range. The proposed speed control scheme has the concept of DC link voltage control proportional to the desired speed of the PMBLDC motor. The PFC converter based PMBLDCM drive is designed, modeled and simulated using MATLABSimuLink environment. This drive ensures high accuracy and robust operation from near zero to high speed. Simulation and experimental results of these systems are presented and the performance measures are compared. The simulation and experimental results with bridgeless boost converter show that there is an improvement in power factor.
author_names: Chandrahasan Umayal

B Janani

S Rama Reddy
title: DIGITAL IMPLEMENTATION OF PFC HALF BRIDGE CONVERTER FED PMBLDC MOTOR USING MICROCONTROLLER
year: 2012

abstract: A 3 phase PWM boost rectifier is described that uses DC link inductors and an asymmetrical half bridge to obtain a unity fundamental power factor supply current with a low total harmonic distortion. The paper describes how the rectifier circuit structure can be broken down to form a fundamental circuit topology that contains two mutually decoupled boost power converter circuits. These boost circuits contain two near triangular voltage sources, phase shifted from one another by 60/spl deg/ in the AC supply cycle, two DC link inductors and two semiconductor switches per circuit. The 3 phase bi directional switches used in the bridge have very low electrical stresses with a low switching frequency, zero voltage switching and a 0.2 p.u. current rating. Extensive analysis of the circuit switching states is presented and comparisons are made with 3 phase rectifiers using AC inductors. The operation of the rectifiers are illustrated with reference to simulation and experimental results.<ETX>
author_names: John C Salmon
title: 3 phase PWM boost rectifier circuit topologies using 2 level and 3 level asymmetrical half bridges
venue: Proceedings of 1995 IEEE Applied Power Electronics Conference and Exposition APEC'95
year: 1995

abstract: This study deals with the design, modelling and implementation of unity power factor (UPF) boundary conduction mode (BCM) based electronic ballast for a T8, 36 W fluorescent lamp. In low power applications, BCM based boost converter is widely used because of the low inductor value, however, because of zero crossover distortion, achieving a total harmonic distortion of <10% is difficult for universal AC mains. In proposed electronic ballast, UPF has been achieved at universal AC mains by using a boost power factor corrected converter operating in BCM with constant on time control. The achieved constant DC link voltage is converted into high frequency AC voltage using a quasi half bridge series resonant inverter to initiate the discharge and also to drive the fluorescent lamp with constant current. The modelling and simulation of the proposed topology have been performed using sim power system tool boxes in MATLAB Simulink environment. The switching losses have been reduced by achieving zero voltage switching at an operating switching frequency of 46 kHz. Different evaluated parameters have been found as per the international standard IEC61000 3 2 of class C regulations.
author_names: Ashish Shrivastava

Bhim Singh
title: Constant on time controlled zero voltage switching electronic ballast with power quality improvement
year: 2015

abstract: This paper proposes a dimmable light emitting diode (LED) driver featuring a high power factor and zero voltage switching on (ZVS) The circuit is obtained by integrating a boost converter and a dc dc converter with half bridge topology. The high power factor is achieved by operating the boost converter in discontinuous current mode (DCM) The LEDs are dimmed by the control scheme of asymmetrical pulse width modulation (ASPWM) The developed circuit eliminates the inherited dc offset current of the transformer in a conventional asymmetrical half bridge converter by introducing a balance capacitor. Both active switches can operate at ZVS by freewheeling the boost inductor current and the transformer magnetizing current to discharge the energy stored in their parasitic capacitance. The circuit operation is analyzed in detailed, and mathematical equations are derived. Finally, a 115 W prototype circuit for driving high brightness LEDs was built and tested. The experimental results verify the feasibility of the proposed LED driver with satisfactory performance. It can achieve a high power factor and ZVS operation.
author_names: Hung-Liang Cheng

Yong-Nong Chang

Lain-Chyr Hwang

Hau-Chen Yen

Shun-Yu Chan

Wen-Fu Yang
title: A High Power Factor Dimmable LED Driver with Integrated Boost Converter and Half Bridge Topology Converter
year: 2020

abstract: LLC resonant converters are one of the best choices in AC DC converters. But, low power factor is a serious problem in AC DC LLC resonant converters. Adding a boost circuit in front of the converter improves the power factor albeit the increase in circuit complexity. To reduce the size and cost, both the boost and LLC stage can be controlled by the same switches. However, these single stage topologies are less efficient in regulating DC bus capacitor voltage pertaining to transients in the line voltage and load conditions. The paper proposes a new single stage topology for AC DC LLC resonant converters. The circuit consists of three level half bridge flying capacitor topology. Discontinuous conduction mode ensures inherent unity power factor operation. Switching frequency control and PWM duty ratio control are used to regulate the output voltage and bus capacitor voltages of the converter respectively. This dual control scheme makes the converter DC bus voltage nearly constant over a wide range of load and line voltage variations. Furthermore, the three level topology guarantees reduced switching stress and losses. The operation of the topology has been validated using MATLAB simulation.
author_names: Antony K Peter

Jaison Mathew
title: A Three Level Half Bridge Flying Capacitor Topology for Single Stage AC DC LLC Resonant Converter
venue: 2018 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES)
year: 2018

abstract: This paper presents a power factor corrected (PFC) boost converter based half bridge LLC resonant converter (LLC) for electric vehicle battery charging application. The proposed converter utilizes a boost converter as a front end converter operating in continuous inductor conduction mode (CICM) to achieve unity power factor at AC mains, and LLC to facilitate the EV battery charging. The boost converter is operated in pulse width modulation (PWM) at fixed frequency, whereas LLC converter uses pulse frequency modulation (PFM) technique to maintain power delivered to the battery. A 2kW rating prototype of the proposed converter is designed and implemented using TMS320F28035 microcontroller. The performance of proposed converter is presented under various load and line conditions
author_names: Rahul Pandey

Bhim Singh
title: A Power Factor Corrected Electric Vehicle Battery Charger Using Boost Converter
venue: 2018 8th IEEE India International Conference on Power Electronics (IICPE)
year: 2018

abstract: Photovoltaic (PV) inverters form the backbone of PV generation. This paper proposes an all film capacitor, transformerless single phase inverter for PV application. The topology is a combination of a front end boost stage, a half bridge (HB) inverter stage, and a buck boost power decoupling stage. The grid ripple power is decoupled by a large swing of the HB capacitors along with a limited ripple on the dc link, thus reducing the capacitance requirement and converter volume. Being an HB derived inverter, the high frequency common mode leakage current through the PV parasitic capacitance is mitigated. Furthermore, the dc link average is optimally controlled to ensure a higher efficiency over wide operating load and power factor range. To validate its operation, a Silicon Carbide based 1 kVA laboratory prototype is built and closed loop experimental results are provided at 100/75 kHz switching frequency over wide operating conditions.
author_names: Jinia Roy

Yinglai Xia

Raja Ayyanar
title: Half Bridge Voltage Swing Inverter With Active Power Decoupling for Single Phase PV Systems Supporting Wide Power Factor Range
venue: IEEE Transactions on Power Electronics
year: 2019