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This paper aims to study an active-clamped resonant flyback converter. The proposed resonant technique can increase the zero-voltage switching (ZVS) range. Gallium Nitride high electron mobility transistor (GaN HEMT) devices are also applied in this study to reduce the switching losses at high-frequency operation. Synchronous rectifier is designed on secondary side to minimize the conduction losses...
This paper presents present a study and implementation of a three-level boost converter. This converter feature includes low devices voltages stress requirement for high voltage application, small inductor size that leads to the reduction of cost and size and can be operated with a wide range input voltage. Unlike conventional method, output capacitor voltage balancing was done by a slight phase shift...
The charge unbalancing decreases the total storage capacity and the entire life cycle of batteries. In order to prevent the charge differences among cells, cell balancing system or charge equalization have been proposed. This paper proposes an active balancing system based on switched-capacitor charge equalization for series-connected batteries. This circuit topology allows two series-connected cells...
This paper proposes a new control algorithm to improve the defect of the cited interleaved twin-buck converter in the literature. The algorithm can adjust the voltage gain by modulation the duty cycle. And by asymmetrically phase-shift the turn-on periods of the two actives switches, i.e. partially overlapping the turn-on intervals, one of the active switch can benefit from zero-voltage switching...
This paper proposes a novel battery-balancing mechanism. By modular and decentralized design, this balance circuit can be easily expanded for higher-voltage battery strings. Bidirectional flyback converter is applied to transfer the energy from and back to the connected battery module. A capacitor is placed on the common paralleled secondary side to serve as an energy buffer. Average string voltage...
This paper proposes a dual-transformer active-clamp forward converter (DT-ACFC) with nonlinear conversion ratio (NCR), which combines two forward converter units. Since only two active switches are needed, the cost and the circuit complexity can be lowered. To reduce switching loss, the proposed converter fulfills zero-voltage switching by employing the leakage inductance of the transformer and additional...
The power factor correction (PFC) converter is commonly used in many applications nowadays. For high power applications, boost PFC converter operated in continuous conduction mode is usually employed. However, at high-line light-load condition, the converter operates in discontinuous conduction mode. This leads to erroneous input current sampling which results in low power factor (PF) and high total...
A high efficiency, low profile and high step-up dc-dc converter is proposed for low dc voltage renewable energy system. Generally, the power source such as photovoltaic array and the fuel cell stack have low voltage output because of that a high voltage step-up converter is required to boost the voltage much higher than the voltage level for front-end application. The efficiency and voltage gain of...
This paper proposes a hybrid-switching technique for asymmetrical half-bridge flyback converter. In this topology, the duty loss can be minimized because the active switches can achieve zero-voltage-switching (ZVS) and the output diode can be turned off at zero current, which result in higher efficiency, higher power density and universal input voltage range (90–264V). Moreover, this technique doesn't...
This paper presents a DSP-based differential boost inverter (DBI) with maximum power point tracking (MPPT) for photovoltaic (PV) applications. In a conventional DC/AC MPPT system, power of photovoltaic is delivered into two stages, they are DC/DC boost converter and buck type DC/AC inverter. A DC link capacitor appears between these two stages. Furthermore the system has higher complexity and costly...
This paper propose a forward converter with non-linear step-down conversion ratio, comparison with traditional forward converter, it has more better duty utilization ratio, besides, two output inductors can share the load current naturally, the current stress of inductors and output diodes can be reduced. Thus, the proposed converter is suitable for high step-down application. At primary side, active-clamp...
This paper describes the development of an electronic neuron emulator that has both passive and active electrical properties of a neuron as seen from a single electrode. The main utility of this device is for testing electrophysiological equipment such as a single-electrode voltage clamp or a patch-clamp amplifier. Each spike of the action potential is generated by a limited amount of charge stored...
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