This paper presents the operational characteristics of a high voltage flyback converter with resonant elements. In high voltage low power applications, the effect of a transformer’s stray capacitance might be the most important factor that influences the overall performance of the circuit. A detailed mode analysis and the design procedure are presented in designing the high voltage flyback conv...

Coil antennas are widely used in the welllogging tools. Accurate design needs to know how to model the coil impedance in the presence of formation environment, and with the complex tool structure, e.g., the collar and the shield housing. This paper introduces how to accurately compute the impedance of the coil with very thin wires at high frequency with complex 3D configuration. To predict the ...

The hysteretic voltage gap DV , the difference between the threshold voltages for electrons to tunnel into and escape from a single-electron trap ~which consists of N gated small junctions with equal junction capacitances C , equal stray capacitances C0 , and well capacitance Cw! through an m-junction cotunneling process, is studied. By using an exact solution of the potential profiles @Phys. R...

The triple probe method to obtain local, time-resolved measurements of density, electron temperature and plasma potential is investigated in detail. The difficulties in obtaining reliable measurements with this technique are discussed and overcome. These include phase delay errors, ion sheath expansion and limited bandwidth due to stray capacitance to ground. In particular, a relatively simple ...

Over the past two decades, the increase in neutral-beam heating and alpha particle production in magnetically confined fusion plasmas has led to an increase in energetic particle driven mode activity, much of which has an electromagnetic signature which can be detected by the use of external Mirnov coils. Typically, the frequency and spatial wave number band of such oscillations increase with i...

Common-mode choke (CMC) plays an important role in suppressing the leakage current produced during operation of pulse width modulation (PWM) inverters. However, when common-mode path exhibits a large series stray capacitance, particularly capacitance by long shielded cables, CMC core reaches magnetic saturation. This paper presents technique selecting suitable carrier frequency for inverter to ...