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Resonant power conversion is an effective technology for various applications. This paper presents a resonant magnetizing approach, aimed at improving the low power density and cost issues of traditional capacitor-discharged impulse magnetizer. In the method, a resonant tank is established by a series capacitor and inductor. Then, by periodically switching power transistors inside the circuit, the...
This paper presents the analysis and design of an inductively-coupled wireless power transfer system implemented using a three-coil arrangement and the Class E2 resonant DC-DC converter. The three-coil structure is modeled using FastHenry simulation software. The theory of reflected impedance is used to determine the optimum operating conditions. A practical application having an output voltage of...
In this paper a resonant voltage doubler circuit is reported on, which enables high efficiency and low power consumption of a solar cell DC-DC converter (PV converter) for solar cell input. We have also developed a PV converter that uses a resonant voltage doubler circuit and achieved high conversion efficiency of 97.6% at an output power of 10kW.
In this paper, a nanosecond level response digital pulse width modulation (PFM) control circuit for the current resonant converter such as LLC has been proposed. The proposed circuit is composed of a unique analog to digital converter and logic based digital controller. With the experimental results, it was confirmed that the switching frequency can be varied from 0.8 to 1.2MHz in regard to 20% variation...
The purpose of this paper is to propose a new control method of wireless power transfer system that can maintain stable power supply even when the positions of the primary and secondary coil or distance between the two coils largely change. The new method will be done by adjusting the switching frequency to a frequency that can obtain the desired output. We confirmed the effectiveness of new wireless...
In this paper, the effect of phase shift modulation on the LLC resonant converter for an interleaved LLC resonant converter with phase shift modulation is investigated. The LLC resonant converters can achieve zero voltage switching (ZVS) of the primary switches and the zero current switching of secondary switches. Due to the sinusoidal shapes and discontinuous conduction of secondary current, the...
In power electronics, Power Hardware-in-the-loop Simulation (PHILS) which consists of Hardware part and Digital Simulator part has attracted attention. This is the very useful tool to shorten development time and to simplify verification under complicated condition. However, it is known that instability is caused by the time delay between Digital Simulator and Hardware. This paper applies two methods...
A burst dimming controller with primary-side control for electrodeless fluorescent lamp (EFL) electronic ballast is implemented in this paper. The used main circuit is a class D topology with a resonant circuit to form a resonant inverter. Moreover, an 8-bit microcontroller is employed to act as the control core of the system to achieve soft start, burst dimming, and primary-side control feature....
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