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This paper proposes a high efficient soft-switching multiple-input positive buck-boost converter. Multiple-input converters (MIC) use usually forward-conducting-bidirectional-blocking (FCBB) switches to control their input voltages and currents. However, these FCBB switches may decrease the overall system efficiency because of their switching losses. This paper applied a soft-switching method into...
Boost type converters are commonly used as pre-regulators in applications such as photovoltaics, battery storage, and power factor correction. Normally, non-isolated step-up conversion is done using traditional hard-switching boost topologies, but these suffer from low efficiency due to hard switching transitions. Soft-switching boost topologies present an opportunity to increase switching frequency...
This paper presents a magnetic coupling resonant wireless power transfer (MCR-WPT) system. Two separated coils form a loosely coupled transformer. The primary side adopts a Class-E amplifier, which produces high frequency sinusoidal current to excite the primary winding, inducting a high frequency AC voltage in secondary winding. The secondary side adopts a Class-E rectifier to rectify the high frequency...
A two-stage quasi-resonant LED driver with digital control method is proposed in this paper. The first stage of this converter is a boost circuit with power factor correction (PFC) function and the second stage is a dual Buck circuit which works in quasi-resonant zero voltage switching (ZVS) state. Because of the soft switching characteristics of the converter, switching losses are reduced and efficiency...
A novel control strategy is proposed to improve the efficiency and to realize safe soft commutation of the high-frequency inverter which is composed of full-bridge, high-frequency transformer and cycloconverter. Through the novel control strategy the full-bridge switches can achieve almost full-range zero-voltage switching on, and the cycloconverter switches can achieve full-range zero-current switching...
As generally acknowledged, the high step-up DC-DC converter is widely used in the sustainable energy system as the front-end stage of the DC-AC converter. Therefore, a novel high step-up DC-DC converter is proposed in this paper. The proposed converter with network of switched-inductor and switched-capacitor can achieve high voltage gain under low duty cycle. Meanwhile, the active switches and diodes...
We define the virtual infinite capacitor (VIC) as a nonlinear capacitor that has the property that for an interval of the charge Q (the operating range), the voltage V remains constant. We propose a lossless zero-voltage switching realization for the VIC using a switched power converter and capacitors. This circuit is simple but it requires a complex control algorithm that we describe. There are two...
This research presents an optimal design of a phase shift full bridge (PSFB) converter with a proposed constant power (CP) charge mode for capacitor charging power supply (CCPS). Three pieces of PSFB transformer are connected in series at the output to overcome the high voltage stress for each component as well as in parallel at the input for sharing the large current. The proposed converter is designed...
The paper presents a novel ZVS buck converter topology. The proposed topology solves narrow duty cycle and hard switching problems of conventional buck converter in lower output voltage and higher output current. At the same times, the voltage stresses across main switches are also clamped at input voltage. In the topology, an adjustable inductor and a resonant capacitor are used to reduce charge...
This paper addresses the control of a Dual Active Bridge (DAB) dc/dc converter. Closed-loop control of the output voltage is achieved by a novel nonlinear technique that separates the control algorithm into a linearization stage and a linear control law. The resulting DAB is capable of bidirectional power flow, and the transformer isolation makes it suitable for a wide variety of applications. The...
In this paper the circulating energy of an integrated auxiliary commutation circuit applied to a double-conversion uninterruptible power supply is analyzed. This analysis is based on a comparison between the circulating energy of Zero Voltage Transition (ZVT) and integrated Zero Voltage Transition (iZVT) in Auxiliary Commutation Circuits (ACC), both attached to the same double-conversion UPS. Two...
This paper presents a mathematical model through which the operation of a split-capacitor push-pull parallel resonant converter (SCPPRC) in conventional normal mode can be analyzed. The SCPPRC converter can also be operated with a variable switching frequency to provide a lower (Buck) or higher (Boost) peak load voltage than that which would result in the normal mode. The variable switching frequency...
In this paper, the operating principle of a soft-switching three-phase PWM inverter circuit and its experimental result verification are discussed and analyzed firstly. Then a comparative method is employed to obtain the detailed mathematical description of power loss and efficiency for the discussed soft-switching inverter circuit, and presents the power loss simplified models of inverter circuit...
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