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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 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...
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 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...
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