Modeling and Efficiency Analysis of Multiphase Resonant-Switched Capacitive Converters

Abstract

This paper presents an analytical method to evaluate pertinent data of the resonant capacitive switching converter especially the voltage gain and power efficiency. Instead of long transient simulation time, the proposed model uses frequency decomposition to speed-up computation. This method is valid for N-phase operation and extends the recently published studies on this promising topology outside zerocurrent/voltage switching conditions. Thanks to this tractable expression, we also reveal the intrinsic efficiencies over the voltage gain of 2-and 3-phase structures working at the resonant frequency in step-down operation. These results help to gain better understanding of multi-phase operation and encourage additional studies to use the full capability offered by the resonant switched capacitor converter especially for power onchip integration.

Coordinated Mitigation Control for Wideband Harmonic of the Photovoltaic Grid-Connected Inverter

“…Combining Equation (4) with Equation ( 5), active damping can establish the expression relationship with K c and G PWM (s) in Equation (6).…”

“…On the one hand, the switching frequency of power electronics varies from several hundred Hz to several tens of kHz, leading to significant high-order harmonics carried in the supply current generated by such power sources [3,4]. On the other hand, power electronic devices show the decentralization trend in the distribution network, and low-order harmonic components and the risk of parallel resonance exist simultaneously [5,6]. The continued growth of harmonic content causes problems such as resonance, distributed power off-grid, energy supply shortage, and increased equipment losses to the distribution system [7][8][9].…”

Challenges for fully-integrated resonant switched capacitor converters in CMOS technologies

“…where Pin is the input power, Pcond and Psw are the conduction and switching losses in the converter, voNL is the no-load output voltage, IDC is the DC output current, Csw is the gate capacitance of switches, and Vg is the switches' gate voltage swing. From (5), the sizes of switches are inversely proportional to the conduction loss and directly proportional to the switching loss.…”

“…They employ the same topology of the SC converter but comprise an inductor placed in the charging and discharging paths to create an adiabatic energy transfer which improves the efficiency. The resonance operation allows the reduction of switching losses by adopting the zero current switching and working at significantly lower frequencies with respect to SC converters with the same area while having the same output resistance [5]. In [6], [7], the ReSC converters are implemented with discrete inductors attached to the top of the die.…”