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This paper presents an analysis of coupled inductors and transformers for zero-current transition (ZCT) converters. The coupled inductors and the transformer are adapted to ZCT converters to improve the efficiency of the converters. To analyze and simulate a magnetic field distribution of the coupled inductors and the transformers, the ANSYS software is employed. Prototype converters are a boost converter...
This paper presents an analysis of transformers for zero-current transition (ZCT) forward converters. In order to reduce switching losses and noises, a soft-switching technique is adopted. It is suitable for the pulse-width modulation (PWM), because the resonant transition is very short and it is independent of the switching frequency. To analyze and simulate a magnetic field distribution of the transformers,...
This paper presents an analysis of a coupled inductor for zero-current transition (ZCT) converters. In order to reduce switching losses and noises, a soft-switching technique is adopted. It is suitable for the pulse-width modulation (PWM), because the resonant transition is very short and it is independent of the switching frequency. We adapt a coupled inductor which consists of a boost inductor and...
This work deals with modeling of magnetically driven new type diaphragm pump and further development of driving control system for it. The pump has highly nonlinear behavior and complicated structure which makes the modeling task quite involved. After designing a motion model of the pump, an analysis of the magnetic field distribution and generated electromagnetic forces driving the pump is given...
This paper presents a digital current controller for zero-current transition (ZCT) bidirectional converters. In order to reduce switching losses and noises, a soft-switching technique is adopted. It is suitable for the pulse-width modulation (PWM), because the resonant transition is very short and it is independent of the switching frequency. A field programmable gate array (FPGA) and a 2.5 MHz analog...
In this paper, an accurate position estimation method is reported for salient-pole brushless dc motor drives or permanent magnetic synchronous motor drives. The method is proposed for obtaining the position angles, the accuracy of which affect the operation of the switching devices of the inverter that drives the motor. First, the method for estimating the position angle is proposed. Secondly, the...
This paper deals with modeling and design of reliable controller for a new type diaphragm pump. Because of parameter uncertainties and nonlinear dynamics of the pump model, a fuzzy-like PID controller is designed. The controller design is based on fuzzy Lyapunov synthesis and stability and the robustness analysis of the designed system are straightforward. The pump control system is driven by a digital...
This paper presents a zero-current transition (ZCT) flyback inverter for small scale wind power generation systems. Although the proposed system has such small output power as 500 W, a few sets of wind power generation systems can be easily connected in parallel for the higher output power requirements. When the wind power generation system is constructed by a lot of small power ones, the total system-cost...
Zero-current transition (ZCT) converters for wind power generation systems are proposed. In order to reduce switching losses and noises, a soft-switching technique is adopted. It is suitable for the pulse-width modulation (PWM), because the resonant transition is very short duration and it is independent of the switching frequency. A laboratory prototype using a digital controller for the ZCT converter...
A zero-voltage transition (ZVT) flyback inverter is proposed. The current in the flyback transformer is controlled in the fixed frequency, and the pulse width is varied to make the inductor current sinusoid. In order to reduce switching losses and noises, a soft-switching technique is adopted. The soft-switching technique is called the switched snubber circuit or the primary current steering technique...
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