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This paper presents a new bidirectional AC-DC interleaved converter topology and its control technique. The proposed control technique, based on One Cycle Controller (OCC), is used to process power in all four quadrants in the V-I plane. A fictitious reactive current is introduced in the control law that decides the PWM switching action. Further, a size reduction of the input side magnetics by the...
Electric power take-off systems in automotives requires the application of low voltage high current step up DC-DC converter with a high voltage gain. Researchers have evaluated enhancements for high efficiency and low cost designs. In this paper, a novel topology is proposed that has the capability of providing a high voltage gain over a wide range of output power. It also has fewer components and...
An algorithm based on new circulated current model is proposed to analyze the circulating current in the multiphase LLC converter. First of all, a virtual-open concept is introduced and LLC phases are decoupled from each other, Thus, A circulating current model can be achieved from fundamental harmonic approximation (FHA). Secondly, the ac voltages on the equivalent resistor of different phases are...
LLC resonant converter is widely used in industry. However, up to now, no simple and accurate small-signal equivalent circuit model is available. This paper proposes an equivalent circuit model of LLC resonant converter. The simple equivalent circuit model is derived based on modification and simplification of extended describing function method. The model can well predicts the small-signal behaviors...
A novel high efficiency high step-up DC-DC converter is proposed in this paper. The proposed converter can achieve high voltage ratio with appropriate duty cycle by using the coupled-inductor and cascode technique. In order to achieve high efficiency, a capacitor is used to recycle the leakage energy of the coupled-inductor and reduce the voltage stress on the switch. Therefore, the low-voltage rating...
This paper presents a single-stage, isolated DC-AC converter topology based on the dual active bridge concept. The proposed topology has the advantages of low device count and high efficiency due to the single-stage power processing structure and zero-voltage-switching (ZVS) operation of the MOSFETs. Double-line-frequency energy buffering can be achieved via the high voltage side dc bus capacitor,...
A passive impedance matching (PIM) concept is proposed for multi-phase resonant converters application. The new concept can achieve load current sharing between every unit automatically. A passive element such as an inductor or a capacitor is connected in the common branch of the two units (or multi-units), such that several sets of equivalent positive resistors and negative resistors are distributed...
In this paper, a new common capacitor current sharing method is proposed for multi-phase LLC resonant converter. Automatic current sharing is achieved by using a common resonant capacitor for all the LLC resonant stages, by connecting the resonant capacitors in each phase in parallel. The proposed method can automatically share the load current without any additional circuits and control strategy...
In this paper, a high power-density output-inductor-less full-bridge converter for the HVDC power distribution system is proposed. The new reduction techniques of switching loss and noise in the output-inductor-less full-bridge converter by using SiC-MOSFETs are applied. As the result, the power loss is reduced by 20W in a wide load range, and the noise is also reduced. Furthermore, a high power density...
Inductor-less, high gain DC-DC converter with high efficiency and high power density is a much desired circuit in Electric Vehicle (EV) powertrain and Solar photovoltaic (SPV) power converters. Modular Multi-level capacitor clamped DC-DC converter circuits (MLCCC) provide a viable solution for this case. But, their application is limited owing to their limitations in terms of fixed output voltage...
For a Li-ion battery based energy storage system, the state of energy is a key index for the energy management and operation optimization. In the actual Li-ion batteries based energy storage system in building environment, the varying load current will lead to the estimated battery's residual energy deviated from the real value. To solve this problem, an equivalent circuit model is presented for the...
Safe start-up procedure is critical for reliable operation of power converters. The challenges in start-up schemes of high-frequency (HF) transformer link inverters involve pre-charge of the capacitors without significant inrush currents and over-voltages. The pre-charge is normally followed by enabling of the closed-loop control. The over-voltage or inrush current problems in conventional start-up...
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