ABSTRACT Electric vehicles are gaining importance as they are a clean and cheap mode of transportation. Conductive charging gun is used to charge most of the electric vehicles. If the charging gun is not connected properly or is loose, then there is a possibility that the gun becomes hot, so the thermal sensor of the charging gun stops charging, or in some conditions it is reason of catching fire in the electric vehicle. In this paper, a non‐conductive inductive power transfer charging gun is proposed to charge an electric vehicle. Proposed non‐conductive inductive power transfer charging gun solves all problem which comes during charging of EV from a conductive gun. The electric shock hazard and safety related issues are addressed by this topology. In an electric vehicle, isolation should be provided, but in the case of charging an electric vehicle using a non‐conductive inductive power transfer charging gun, transmitting and receiving coils provide isolation, so the isolation stage can be removed. The coupling coefficient between the coil and the self‐inductance of the coil is calculated with the help of FEM software. The hardware prototype results are shown to validate that the proposed 1.5 kW non‐conductive inductive power transfer charging gun of an electric vehicle is demonstrated to transfer 15 A DC current load at 100 V DC output voltage and is validated for effectiveness.
ABSTRACT This work presents a 5‐bit successive approximation register (SAR) analog‐to‐digital converter (ADC) implemented using unipolar, single‐gate amorphous indium‐gallium‐zinc‐oxide (a‐IGZO) thin‐film transistors (TFTs). The circuit was fabricated on a 30 m‐thick polyimide substrate with an active area of 6.53 mm. The proposed ADC architecture employs the charge‐sharing (CS) principle to achieve low power consumption through passive switching. In addition, noise shaping (NS) is incorporated to enhance the effective number of bits (ENOB) and thereby improve the overall figure‐of‐merit (FoM). With NS, the ADC achieves an ENOB of 6.22 bits over a signal bandwidth of 346 Hz with an OSR of 4. The ADC operates at a sampling frequency of 2.77 kHz and consumes 2.48 mW of power from a 4 V supply under ambient conditions. Considering the effective signal bandwidth, the ADC achieves a Walden FoM () of 48.2 nJ/conversion‐step. To the best of our knowledge, this is the first demonstration of a CS‐NS‐based SAR ADC architecture using flexible unipolar TFT technology. Owing to the combination of passive CS conversion and first‐order NS, the proposed ADC is suitable for flexible biomedical applications.
ABSTRACT In renewable and hybrid energy storage applications, integrated three‐port converters (TPCs) offer advantages of a simpler circuit, higher efficiency, and lower cost than stand‐alone ones. In this paper, a topology derivation approach is proposed to obtain many viable topology candidates of TPCs for practical non‐isolated applications. To begin with, the general principle of the topology derivation is given to ensure the physical realizability of the derived topology. Based on the topology structures of six classical DC–DC converters, the voltage‐type input port (IP), output port (OP), and energy buffer (EB) are extracted, and then two types of fundamental switching component cells, that is, inductor excitation cell (IEC) and inductor discharging cell (IDC) are constructed in terms of power flow directivity. Through multiple path planning in non‐isolated power flow, a flow diagram for the optimal design procedure is presented to guide the synthesis of TPCs. Following this procedure, six possible types of the IEC and IDC in one inductor branch are configured so that six new dual‐input dual‐output (DIDO) converters are derived. Furthermore, a variety of practical power flow paths are reconstructed by means of the appropriate combination of IP and OP, which leads to the fact that these proposed DIDO converters give birth to a family of integrated TPCs. The derived TPCs are further compared in terms of voltage characteristics, device count, electrical stress, and current characteristics to guide topology selection. Particularly, the proposed method can also derive a series of high‐dimensional N ‐port converters. As one example, one derived TPC named buck‐boost‐A‐I3 is analyzed in three operation modes respectively. Finally, these above theoretical analyses are verified by those experimental results.
ABSTRACT LCL‐type dual‐active‐bridge (DAB) converters offer high power density but are analytically sensitive to deviations in resonant parameters. Variations in inductance, often reaching 25% due to thermal factors and magnetic characteristics, disrupt the resonance condition, leading to a loss of zero‐voltage switching (ZVS). To address this vulnerability, this paper presents an adaptive LCL‐DAB architecture that utilizes a switch‐controlled capacitor (SCC). In this strategy, dual‐phase‐shift (DPS) modulation is used to maintain ZVS and regulate the output voltage. Concurrently, the SCC compensates for inductive‐reactance drift to lock the ideal resonant frequency and maintain ZVS. This allocation of control functions ensures the converter sustains the ideal analytical resonant state across the entire operating range and prevents control‐loop interference during load transitions. Results demonstrate that the proposed system successfully compensates for a 25% variation in inductance while achieving a peak efficiency of 98%. By providing continuous reactance compensation, this architecture ensures superior performance compared with static or discretely tuned configurations.
