Fully equipped half bridge building block for fast prototyping of switching power converters

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Reversible DC-DC converter for a dual voltage automative system using zero voltage switching techniques

Abstract: A novel hysteretic controller for a bi-directional dc-dc converter with ZVS and interleaving for dual voltage systems in automobiles is presented. A variable frequency extended band hysteretic current control method is proposed. In comparison with classical fixed frequency current control PWM, the reverse polarity peak current needed for ZVS operation is kept constant. Inductor current ripple decreases with load reduction. Automatic changes in operation between buck and boost modes are accomplished without transient currents. Converter simulations are carried out using Matlab/Simulink platform

Control por histéresis para un inversor buck-dual conectado a la red

Single-phase inverters are widely used in different renewable energy applications. Although the full-bridge inverter is typically used, dual-buck inverters provide an important advantage, since they eliminate the shoot-through problems. However, solutions proposed in the literature require additional inductors, use linear controllers designed around an operation point, or cannot be used in grid-connected applications. This paper presents a hysteresis current control of a single-phase dual-buck full-bridge inverter for grid-connected active power injection. Includes the dynamical model in state variables, as well as analytical conditions to guarantee the evolution of the error dynamics in a set with boundaries defined by the designer. Moreover, the paper provides guidelines for the design of the dead band required for the transitions between the positive and negative semi-cycles (and vice-versa) of the grid voltage. Finally, simulation results validate the main features of the controller as well as the design of the dead band.Los inversores monofásicos son ampliamente usados en diferentes aplicaciones de energías renovables. Aunque típicamente se usa el inversor de puente completo, el inversor buck-dual provee una ventaja  importante porque elimina el problema de posibles cortos-circuitos. Sin embargo, las soluciones reportadas en la literatura requieren inductores adicionales, usan controladores lineales diseñados para un punto de operación, o no se pueden usar en aplicaciones de conexión a la red. En este artículo se presenta un control por histéresis para un inversor monofásico buck-dual de puente completo con conexión a la red para inyección de corriente activa. En particular, se presenta el modelo matemático en variables de estado y se obtienen condiciones analíticas para garantizar la evolución de la dinámica de error dentro de un conjunto con límites establecido por el diseñador. Además, se discuten los elementos para diseñar la banda muerta requerida en la transición entre los semi-ciclos positivos y negativos de la tensión de la red. Finalmente, los resultados de simulación validan las principales características del controlador propuesto, así como el diseño de la banda muerta

Dual Output Power Management Unit for PV-Battery Hybrid Energy System

The tremendous evolution in the electronics industry has provided high performance portable devices. However, the high power demand and the limited capacity of batteries, prevent the devices from operating for a long time without the need of a power outlet. The ease of deploying Photovoltaic (PV) cells close to the device enables the user to harvest energy on the go, and get rid of the conventional power outlets. However, applying the PV power to the electronic devices is not as easy as the plug and play model, due to the unstable output voltage and power of the PV cells. In this thesis, a power management unit is proposed to provide dual regulated outputs using a PV module and a rechargeable battery. The main components of the unit are a Dual Input Multiple Output (DIMO) DC-DC converter and a digital controller. The converter is used to interface the battery and the PV module with the loads. Moreover, the proposed converter has the ability to step up or step down the input voltage. The controller maximizes the PV power using the fractional open circuit voltage Maximum Power Point Tracking (MPPT) method. Furthermore, the controller manages the amount of power supplied to or from the battery in order to satisfy the load demand and regulate the outputs at the required levels. The controller has been implemented and synthesized using VHDL. A prototype has been implemented using an FPGA and off the shelf components. The functionality of the system has been tested and verified under varying environmental conditions

Zero voltage switching used for a reversible DC-DC converter

Abstract A novel bi-directional dc-dc converter with Zero Voltage Switching (ZVS) and interleaving for dual voltage systems in automobiles is presented. A variable frequency extended band hysteretic current control method is proposed. In comparison with classical fixed frequency current control PWM, the reverse polarity peak current needed for ZVS operation is kept constant. Inductor current ripple decreases with load reduction. Automatic changes in operation between buck and boost modes are accomplished without transient currents. Converter simulations are carried out using Matlab/Simulink platform

On modeling and real-time simulation of a robust adaptive controller applied to a multicellular power converter

Introduction. This paper describes the simulation and the robustness assessment of a DC-DC power converter designed to interface a dual-battery conversion system. The adopted converter is a Buck unidirectional and non-isolated converter, composed of three cells interconnected in parallel and operating in continuous conduction mode. Purpose. In order to address the growing challenges of high switching frequencies, a more stable, efficient, and fixed-frequency-operating power system is desired. Originality. Conventional sliding mode controller suffers from high-frequency oscillation caused by practical limitations of system components and switching frequency variation. So, we have explored a soft-switching technology to deal with interface problems and switching losses, and we developed a procedure to choose the high-pass filter parameters in a sliding mode-controlled multicell converter. Methods. We suggest that the sliding mode is controlled by hysteresis bands as the excesses of the band. This delay in state exchanges gives a signal to control the switching frequency of the converter, which, in turn, produces a controlled trajectory. We are seeking an adaptive current control solution to address this issue and adapt a variable-bandwidth of the hysteresis modulation to mitigate nonlinearity in conventional sliding mode control, which struggles to set the switching frequency. Chatter problems are therefore avoided. A boundary layer-based control scheme allows multicell converters to operate with a fixed-switching-frequency. Practical value. Simulation studies in the MATLAB / Simulink environment are performed to analyze system performance and assess its robustness and stability. Thus, our converter is more efficient and able to cope with parametric variation.Вступ. У статті описується моделювання та оцінка надійності силового перетворювача постійного струму, призначеного для взаємодії із системою перетворення з двома батареями. Прийнятий перетворювач є односпрямованим і неізольованим перетворювачем Бака, що складається з трьох паралельно з’єднаних між собою осередків, що працюють в режимі безперервної провідності. Мета. Для вирішення проблем, пов’язаних з високими частотами перемикання, потрібна більш стабільна, ефективна система живлення з фіксованою частотою. Оригінальність. Звичайний регулятор ковзного режиму страждає від високочастотних коливань, викликаних практичними обмеженнями компонентів системи та зміною частоти перемикання. Отже, ми дослідили технологію м’якого перемикання для вирішення проблем інтерфейсу та комутаційних втрат, а також розробили процедуру вибору параметрів фільтра верхніх частот у багатоосередковому перетворювачі зі ковзним режимом. Методи. Ми припускаємо, що ковзний режим управляється смугами гістерезису як надлишками смуги. Ця затримка обміну станами дає сигнал управління частотою перемикання перетворювача, який, своєю чергою, створює керовану траєкторію. Ми шукаємо рішення для адаптивного керування струмом, щоб вирішити цю проблему і адаптувати гістерезисну модуляцію зі змінною смугою пропускання для пом’якшення нелінійності у звичайному ковзному режимі керування, яке щосили намагається встановити частоту перемикання. Таким чином вдається уникнути проблем із деренчанням. Схема керування на основі прикордонного шару дозволяє перетворювачам з кількома осередками працювати з фіксованою частотою перемикання. Практична цінність. Імітаційне моделювання у середовищі MATLAB/Simulink виконується для аналізу продуктивності системи та оцінки її надійності та стабільності. Таким чином, наш перетворювач ефективніший і здатний справлятися зі зміною параметрів

Simulation on modified hysteresis current control in half-bridge bidirectional DC-DC converter

This paper proposes a modified hysteresis current control method for half bridge bidirectional DC-DC converter (HBDC). Hysteresis current controller is modified by adding logic circuit at input signal S1 and S2 to change performance of inductor current, IL. According to current direction transition, IL stays at zero in a moment. It is happens when Irefp is crossing zero and continues bouncing when Irefm is crossing zero. This method is applied to reduce loss in HBDC performance, which as a result will achieve reduction in switching losses and conduction losses. The conduction losses and switching losses has been analyzed which conduction losses has slight changes in losses reduction and switching losses is reduce from 6.31 J to 4.53 J. The proposed hysteresis current controller was simulated using PSIM and the losses is verify on each switching changes. The result validated proposed hysteresis current control capability in losses reduction

GAN LIGHT EMISSION CONTROLLED DC-DC CONVERTER

This work demonstrates the very first implementation of electroluminescence from a gallium nitride vertical diode as a feedback mechanism for real-time current control of a power converter. Current estimation via electroluminescence provides a galvanically isolated sensor capability that is not susceptible to electromagnetic interference, which is inherently produced in switch mode power supplies. The light feedback is converted to an electrical signal that is further digitally filtered to construct a 3D current calibration surface. This surface converts duty cycle and light signal intensity into a real-time current estimation utilized as a feedback parameter in a buck converter control system. The accuracy of current estimation is shown to be within 5% of steady-state current over various load conditions. Transient-state response was also demonstrated for step changes in commanded current and voltage within the power converter. Methods of increasing accuracy and reducing current estimation delay time are discussed.Lieutenant, United States NavyApproved for public release. Distribution is unlimited

Scalability of Quasi-hysteretic FSM-based Digitally Controlled Single-inductor Dual-string Buck LED Driver To Multiple Strings

There has been growing interest in Single-Inductor Multiple-Output (SIMO) DC-DC converters due to its reduced cost and smaller form factor in comparison with using multiple single-output converters. An application for such a SIMO-based switching converter is to drive multiple LED strings in a multi-channel LED display. This paper proposes a quasi-hysteretic FSM-based digitally controlled Single-Inductor Dual-Output (SIDO) buck switching LED Driver operating in Discontinuous Conduction Mode (DCM) and extends it to drive multiple outputs. Based on the time-multiplexing control scheme in DCM, a theoretical upper limit of the total number of outputs in a SIMO buck switching LED driver for various backlight LED current values can be derived analytically. The advantages of the proposed SIMO LED driver include reducing the controller design complexity by eliminating loop compensation, driving more LED strings without limited by the maximum LED current rating, performing digital dimming with no additional switches required, and optimization of local bus voltage to compensate for variability of LED forward voltage (VF) in each individual LED string with smaller power loss. Loosely-binned LEDs with larger VF variation can therefore be used for reduced LED costs.postprin