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In this paper, an analytical expression for the DC bus harmonics on the input capacitor, caused by a three phase pulse width modulation (PWM) inverter of a high speed motor drive system, is derived. As the result, we found that the parasitic line inductance between the battery and the input capacitor, and the input capacitor are indirectly proportional. We can achieve the calculation method of the...
This paper proposes a high frequency switching active clamp flyback converter which can reduce the height of the transformer and the size of the power supply. This is accomplished by applying an adequate resonance voltage lower than the absolute maximum rating of the drain to source breakdown voltage of the switching device. By using this approach we succeeded in reducing the height of the transformer...
Wireless Power transfer using electric field can realize highly efficient electrical power transmission and the transmission units are thin and light. However, the transmission system produces large electric field intensity and the electric field noise can make other electronic devices malfunction. A shield box is greatly effective to reduce the electric intensity 60dB without a decline of transmission...
The purpose of this paper is to reveal possibility that suppression of output capacitance on dc-dc converter by applying fast P control method. Furthermore, in HVDC system, a consideration whether this control method is effective for miniaturization of output capacitor is presented. A prototype uses 800 W full-bridge dc-dc converter.
This paper proposes a control method to extend the range of ZVS in the phase-shifted full-bridge(PSFB) converter without any additional auxiliary components. During the dead-time, ZVS is achieved by using the energy stored in the inductors to discharge and charge the output capacitance of switches. By analyzing the equivalent circuit of the converter during dead-time, the relationship between the...
This paper introduces extension of concept of discrete control method of class E amplifier to the varying load reactance. Previous discrete control method could keep nominal operation of the class E amplifier for varying load resistance. But, it could not apply for the varying load reactance. In this paper, with varying shunt capacitance and output resonant capacitance, discrete control which keeps...
Recently, a world is the point of need with new energy of high efficiency measures according to global climate change issues and energy shortages. [1] One of the various measures an energy control is to design and development at a precise circuit that can be used conservation and efficiency as the center with the power in industrial apparatus. High-frequency induction heat treatment industrial facilities...
The electronic circuits are miniaturized because the technique on integrated circuits has been developing. The reactance components of converters are miniaturized by using high switching frequency. The resonant converters are useful because of the low switching loss in semiconductor switches. At the resonant converters, raising or lowering output voltage is fundamentally controlled by the switching...
Generally, the way of 0.1C current fully discharge battery capacity measurement, which is required for 10 hours discharge during this process, is time and energy consuming. This paper is to introduce a new method to measure battery capacity accurately in shorter time. This new method will use the technique of multi-frequency measurement for battery during discharge. This measurement will eventually...
This paper presents analytical expressions of the class-E inverter to satisfy the class-E ZVS/ZDS conditions, taking into account the effects of the MOSFET nonlinear gate-to-drain and nonlinear drain-to-source parasitic capacitances. A design example is given along with the PSpice-simulation and experimental waveforms at 2.0 W output power and 4 MHz operating frequency. The waveforms obtained from...
In this paper, the efficiency limits of power electronic converters are investigated from a semiconductor point of view. The approach is presented on the example of a hard switching half bridge while taking Si, SiC and GaN devices into account. Beside parasitic effects of the semiconductors itself, further converter non-idealities and limits from a thermal point of view are discussed. All in all,...
This paper studies the dynamics of the proposed vibration energy harvester to develop the method of designs and controls for the system. The harvester converts vibrational energy into electrical energy through rotational motion of a mechanical pendulum or a so-called parametric pendulum. The rotation is maintained for periodic vibration with appropriate amplitude and frequency. However, such appropriate...
The comparison of the power stage dynamics between a conventional LLC converter and a three-level LLC converter is presented in this paper. The frequency response was similar in continuous current mode, but different in discontinuous current mode. Moreover, how the variation of circuit parameters affects the transfer function of the three-level LLC converter is studied. The experimental verification...
Capacitive power transfer uses an electric field to transmit power through physical isolation barrier utilizing capacitances formed by a couple of metal plates. Despite simplicity of the energy link structure, however, the physical dimension and low dielectric constant of the interface medium usually limits the effective link capacitance to be very small and nearly comparable to the main switch output...
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