Bidirectional Boost Converter Research Articles

Mixed Current Control Strategy for Bi-directional Boost Converter Fed BLDC Drive

The speed of BLDC motor can be varied by applying PWM technique to inverter while the DC-link voltage is constant. Another approach is PAM technique in which the speed of motor is controlled by varying the DC-link voltage. The problem with PWM based drive is switching losses and also restriction in wide speed range operation when the drive is fed by low voltage battery. For wide speed range of operation, a high voltage battery or else a boost derived converter can be used in the front end of the inverter such that the DC-link voltages can be varied. By using boost converter, wide speed range control is possible along with the reduction of ripples in input battery current. This paper presents a mixed current control strategy which combines the inverter based (PWM) and the converter based (PAM) current controller, in addition to that the starting current is limited. The detailed mathematical analysis was derived for boost converter fed BLDC motor drive. The effect of proposed current control in the speed and starting current of motor is verified experimentally

Online Efficiency Optimization of a Closed-Loop Controlled SiC-Based Bidirectional Boost Converter

This article presents an online efficiency optimization strategy for a digitally controlled, wide operating range silicon carbide based boost converter with bidirectional power flow. The proposed strategy minimizes switching losses at any given operating point by adjusting the converter switching frequency and dead times to optimally set the peak synchronous rectifier turn- <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">off</small> current. This results in the converter achieving zero-voltage switching quasi-square wave (ZVS-QSW) operation with minimum inductor current ripple. The optimal timing parameters are determined online by fit functions based on sensed input/output voltages and inductor current, and applied to the converter in a low-bandwidth feed-forward loop operating in conjunction with closed-loop regulation of the converter output voltage. The fit functions are developed from multivariate curve fitting of the analytical solutions of the minimum-conduction ZVS-QSW state plane over the complete range of operation. The proposed approach enables bidirectional operation with efficiencies greater than 97.5% for input voltages ranging from 200 to 400 V, step-up conversion ratios up to 2.5, and power levels between 2 and 8 kW. The converter also achieves efficiencies greater than 99% over wide power levels at boost conversion ratios lower than 2.

A Bidirectional Boost Converter With Application to a Regenerative Suspension System

This paper proposes an algorithm to control the suspension dynamics with an energy regeneration capability and high conversion efficiency. Central to the concept is the development of a switched-mode rectifier (SMR) that is capable of providing either an equivalent positive or negative damping and alternating between regenerative and motoring modes. Simulation results are presented to demonstrate power flow in regeneration and motoring modes and verify the equivalent damping characteristic and vibration energy harvesting. The studies are conducted on a small-scale proof-of-concept electromagnetic suspension system excited by emulated International Standard Organization (ISO) 8608 road profiles. An autonomous start/stop algorithm is proposed such that autonomously turns on or off the converter. This mechanism mitigates quiescent power consumption of auxiliary integrated circuits (ICs) such as gate drivers and current transducers, therefore increasing the conversion efficiency of the power electronics throughout an ISO standardized variable-speed driving cycle. The autonomous start/stop algorithm is implemented experimentally to demonstrate its feasibility under typical standardized driving cycles.

A New Input Clamped Bi-directional Boost Converter for Electric Vehicle Charging with Unity Power Factor

A New Input Clamped Bi-directional Boost Converter for Electric Vehicle Charging with Unity Power Factor

Modeling and Simulation of Multi-input Bi-directional Boost Converter for Renewable Energy Applications using MatLab/Simulink

Modeling and Simulation of Multi-input Bi-directional Boost Converter for Renewable Energy Applications using MatLab/Simulink