Query: battery charger uc3842

title: EV battery charger with non inverting output voltage based bridgeless PFC Cuk converter
abstract: This study proposes an improved electric vehicle (EV) battery charger with a non inverting output voltage based bridgeless power factor correction (PFC) Cuk converter and a flyback converter for controlling the battery current in constant current constant voltage charging regions. The proposed EV charger eliminates the need for an extra inverse amplifier, which is used for the negative to positive output voltage conversion in a conventional Cuk PFC converter. Therefore, the control of the converter is easy to implement and the cost of the charger is also reduced. Moreover, the design of the charger is proposed for discontinuous conduction mode operation, which comes with the inherent advantages of reduced sensors, low reverse recovery in diodes, and zero current switching. The proposed EV charger, with improved efficiency, operates satisfactorily to comply with the IEC61000 3 2 standard for power quality at steady state and for sudden perturbations in mains voltage.

title: Design and Implementation of Solar Power Wireless Battery Charger
abstract: This paper deals with wireless power transmission technology. A battery of an electronic device will be charged wirelessly. The solar panel converts the sun light into electrical energy. Power from a solar panel is sent through a transmitter circuit and received by a receiver circuit wirelessly based on Faraday's law of induction. As magnetic resonance coupling is more efficient and useful than magnetic inductive coupling, in this paper, magnetic resonant coupling is used. There are a transmitter and receiver coil. The transmitter coil is driven at the same frequency of the resonant frequency of the receiver coil. For those reasons, the LC tuned circuit has been built to maintain the same frequency. As power is transmitted wirelessly, some power is wasted. As a result, efficiency is decreased to only 11 After all, it will be a future charging solution in the modern world. With the help of wireless battery charger technology, power can be supplied to the electric cars, drones, hospital's equipment, and smartphones. This device also helps to reduce the necessity of using wires.

title: Modular Self Balancing Battery Charger Concept for Cost Effective Power Assist Wheelchairs
abstract: The paper deals with a power charger capable of quick simultaneous charging of several unevenly discharged batteries. The charger is designed for use in conjunction with a recently developed power assist wheelchair composed of two armrest modules associated with wheels each with its own motor, driver and battery. Uneven discharge of the batteries is very possible in this application. Taking into account the charging power and energy comparable with the most powerful household electrical devices, the refreshing of these batteries and integration of the entire power supply chain into the household grid become a topical and challenging task. Solving of this task requires a special charger that has several channels and can unevenly apply charging power to these channels. At the same time, the charger must not generate current harmonics or reactive power, must operate with good efficiency and satisfy size constraints. In the given research, a configuration of several interleaved isolated single ended primary inductor converters is studied. The synthesized mathematical model of the proposed charger provides data about its static and dynamic characteristics while its experimental investigation focuses on operation details (power losses, control features etc. The obtained results prove that the proposed concept complies with the above mentioned requirements and can be applied in the discussed application.

title: Highly Efficient EV Battery Charger Using Fractional Charging Concept with SiC Devices
abstract: This paper describes the implementation of the fractional power conversion concept for use in an on board charger for Electric Vehicles (EV) High gain step up topologies are required and an efficiency analysis of the full bridge boost converter is made. A comparison of many power devices including Si, GAN and SiC devices concludes that SiC devices are well suited for this application. Using loss equations and battery charging characteristics the converter is optimized for low loss in a full battery charge cycle. Switching average methods model the small signal characteristics and a PI controller is implemented. The fractional charging configuration results in a very high current gain. A 100 kHz prototype was tested on a 300 V EV battery, achieving a converter efficiency of 97.6% For a 400 V battery the charger can charge 4 kW at more than 98% efficiency. The power density of the charger is 3.6 kW/L.

title: A Wide Input and Output Voltage Range Battery Charger Using Buck Boost Power Factor Correction Converter
abstract: In both battery operated electric vehicles (EVs) and plug in hybrid electric vehicles (PHEVs) a two stage converter connects the input grid voltage to the battery pack whose voltage varies from 100 500 V, depending on the vehicle size and range. A universal charger, which can address this wide range of battery pack voltages, is suitable for all vehicle architectures. This requirement is achieved by varying the AC/DC converter output voltage using the concept of variable dc link voltage, which is one of the challenges in battery chargers for attaining universal output voltages. This paper mainly focuses on analysis and operating modes for a interleaved boost cascaded by buck(IBCBB) converter suitable for a power factor correction (PFC) converter. The designed control structure provides a wide degree of control freedom to operate even if the VDC/Vmax (output voltage to peak of Input) less than 0.5. The design considerations for selection of components is also addressed in the paper. Moreover, the proposed converter is validated on the experimental setup and the results are presented in the paper. In addition, a two stage universal battery charger with wide input and output voltage is been simulated and presented in the paper.

title: UPF isolated zeta converter based battery charger for electric vehicle
abstract: Conventional electric vehicle (EV) battery chargers suffer from severe power quality (PQ) issues at AC mains, due to non linear nature of a diode bridge rectifier, used for AC DC conversion. Here, a power factor correction (PFC) circuit based on an isolated discontinuous conduction mode (DCM) zeta converter topology is designed and implemented for charging a 100 Ah, 48 V lead acid EV battery. Test results, for charging an EV battery with constant current constant voltage mode (CC CV) control, are shown with a 1 kW zeta converter prototype. Test results show that the proposed zeta converter conforms to the improved PQ standard such as the IEC 61000 3 2, as well as, a unity power factor (UPF) input current with low harmonic distortion factor is achieved. Moreover, a smooth battery current is obtained during charging, even when there are fluctuations in the supply voltage hence enhanced lifetime of the battery is achieved.

title: New Synergetic Control of a 20kW Isolated VIENNA Rectifier Front End EV Battery Charger
abstract: EV chargers with output power levels in the range of tens of kW are typically employing a front end three phase boost type PFC rectifier stage for sinusoidal input current and DC link voltage control, and a series connected isolated DC/DC converter controlling the actual output/charging current or voltage. This paper explores a new synergetic control of both converter stages, which utilizes the DC/DC converter also for varying the DC link voltage with six times the mains frequency, such that the currents of two mains phases are shaped sinusoidally. Accordingly, two bridge legs of the rectifier stage can remain clamped in 60deg wide intervals of the mains cycle and the pulse width modulation (PWM) can be restricted to the phase carrying the lowest current, i.e. only one of the three bridge legs is operated with PWM, designated as 1/3 PWM. Furthermore, the DC link voltage that is switched by the operating rectifier phase is kept to the minimum and the system features high efficiency and low EMI, but still maintains boost capability, i.e. the option of conventional PWM of all three rectifier bridge legs (thus denominated as 3/3 PWM) which is advantageous in case a wide input or output voltage range needs to be covered. The new control concept is derived starting from a conventional approach with constant DC link voltage, and is verified by simulations for a three level Vienna Rectifier front end and two cascaded DC/DC modules supplied from the halves of the symmetrically partitioned DC link voltage. First, the operating behavior of the system utilizing the proposed control is described analytically. Next, the performance improvement achievable with the proposed control scheme is comparatively evaluated for a 20kW system designed for operation in a wide mains voltage range (260 530Vrms line to line) and an extremely wide DC output battery voltage range (150 750Vdc) according to EV charging equipment supplier requirements of the State Grid Corp. of China. Finally, simulation results are presented which validate the operating principle of the proposed modulation and control scheme.

title: 650V GaN Based 3.3kW Bi Directional DC DC Converter for High Efficiency Battery Charger with Wide Battery Voltage Range
abstract: This paper presents an isolated bi directional DC DC converter built with 650V Cascode GaN FETs for high efficiency battery chargers. The converter adopts the classic dual active bridge (DAB) topology to achieve voltage regulation over a wide battery voltage range. Benefiting from the topology, the converter does not need either variable switching frequency or variable DC link voltage, which resonant converters, such as CLLC, do require. The prototype switching frequency is fixed at 100 kHz and its DC link voltage can be chosen between 380V and 410V, which makes it a superior choice in terms of design for manufacturability (DFM) Additionally, it offers consistently high efficiency, over 97% at rated power over a wide battery voltage range from 250V to 450V. This combined advantage is enabled by the ability of GaN devices to handle both hard and soft switching efficiently, which makes the classic DAB topology more competitive than ever. When combining the prototype and a totem pole active front end, system efficiency of a 3.3kW bi directional battery charger is estimated around 96.7% for rated power and 97.7% for half power at 230Vrms input and 350V battery voltage. The maturity of DAB and Cascode GaN FETs is bringing high efficiency bi directional chargers into real world.

title: A Modular Designed Three Phase High Efficiency High Power Density EV Battery Charger Using Dual/Triple Phase Shift Control
abstract: In this paper, an enhancement mode GaN high electron mobility transistor (HEMT) based 7.2 kW single phase charger was built. Connecting three such single phase modules to the three phase grid, respectively, generates a three phase ~22 kW charger with the <inline formula><tex math notation="LaTeX"\text{97} /tex math>/inline formula> efficiency and <inline formula><tex math notation="LaTeX"\text{3.3} \rm{kW} \rm{L}/tex math> /inline formula> power density, superior to present Si device based chargers. In addition to GaN HEMTs with fast switching transitions yielding high efficiency, the proposed charger employs the dc/dc stage to control the power factor and power delivery simultaneously, yielding little dc bus capacitance and thereby high power density. To secure the soft switching for all switches within full voltage and power ranges, a variable switching frequency control with dual phase shifts was adopted at high power, and a triple phase shift was employed to improve the power factor at low power. Both control strategies accommodated the wide input range (80 260 VAC) and output range (200 450 VDC) A closed loop control for the three phase charger was realized to minimize the output current ripple and balance the power among three single phase modules. Experimental results validated this design.

title: A Controllable Bidirectional Battery Charger for Electric Vehicles with Vehicle to Grid Capability
abstract: This paper proposes a comprehensive methodology for the design of a controllable electric vehicle charger capable of making the most of the interaction with an autonomous smart energy management system (EMS) in a residential setting. Autonomous EMSs aim achieving the potential benefits associated with energy exchanges between consumers and the grid, using bidirectional and power controllable electric vehicle chargers. A suitable design for a controllable charger is presented, including the sizing of passive elements and controllers. This charger has been implemented using an experimental setup with a digital signal processor to validate its operation. The experimental results obtained foresee an adequate interaction between the proposed charger and a compatible autonomous EMS in a typical residential setting.