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To investigate the instability issues of three-phase voltage source converters (VSCs) connected to a weak grid, this paper develops a modeling method based on the harmonic-balance approach. The nonlinear coordinate transformation in the control system would generate two sideband components. If the grid is not strong while the bandwidth of phase-locked loop (PLL) is high enough, the sideband components...
Extensive power management analysis of an inductive power delivery system for medical implants with a 1X/2X reconfigurable rectifier is conducted to help achieve higher system voltage gain and higher system power transfer efficiency under different loading and coupling conditions. Input capacitance matching due to mode switching is analyzed and a matching compensation scheme is proposed. Analysis...
To investigate the input impedance of digital-controlled bi-directional DC/DC converters, this paper develops a modeling method based on the sampled-data approach. Because the nonlinear pulse-width modulator generates sideband components, the sideband effect occurs in a closed-loop converter. And the sampling process of a digital controlled system can significantly influence the sideband components...
In this paper, the effect of digital control on output impedance converter is analyzed. The continuous time equivalent model is used to describe the digital control system in voltage mode, then output impedance is derived by small-signal model. The time delay caused by digital control is considered to analyze output impedance. The analysis indicates that digital control sharpens the peak of output...
A CPW-fed ultra-wideband monopole antenna with X-band rejection filter characteristic is proposed. The proposed rejection filter is obtained by using a stepped impedance resonator (SIR) with inner stub embedded in the CPW fed transmission signal line. The center frequency of the notch band can be controlled by adjusting the dimensions of the stepped impedance resonator and its inner stub. The proposed...
This paper introduces a method to design the external electromagnetic interference (EMI) filters for switching power supplies. The thesis expounds theory and calculates the filter insertion loss, then analyses the impact of the source impedance and the components model on insertion loss. According to the conducted EMI waveform of switching power supply, we make the corresponding EMI filter, and verify...
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