Abstract: In pre-existing modeling and analysis of resonant switched-capacitor (ReSC) converters, input and output capacitances (C in and C out) have long been assumed to be sufficiently large to ensure ideal input and output behaviors.However, this paper reveals that, in practical applications, finite terminal ca-pacitances can have considerable effects on …
Given the 10 volt peak source, the voltages across the capacitor and inductor at the resonance frequency of 159 kHz would be (Q) times greater, or 200 volts. At higher or lower frequencies, the increased impedance lowers the current and also lowers the voltages across the components. At low frequencies, most of the source will appear …
This work explores the design and implementation of a hybrid-resonant switched-capacitor (SC) dc-dc converter based on the stacked-ladder architecture. A particular focus is on improving efficiency and power-density through the use of coupled magnetics and a merged LC resonant structure that can reduce overall size and power loss. A two-phase …
Furthermore, this paper introduces a new structure to connect multiple LLC resonant converters for a wide power range by expanding the capacitor network. A 4-kW …
This paper presents a novel high voltage conversion ratio (HVCR) bidirectional CLTC resonant dc-dc converter. Based on inductor-inductor-capacitor (LLC), series resonant …
This paper proposes a three-phase LLC resonant converter capable of both current balancing and phase shedding. The topology splits the resonant capacitor into two in each resonant tank. One is connected to the power supply line, while the other is connected with those in the other resonant tanks. Appropriate selection of the split ratio naturally …
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A 98.92% efficiency STC product evaluation board (4-to-1, 650W) was developed and demonstrated. The STCs uniquely employ LC resonant tanks to partially replace the …
A resonant capacitor is introduced to the current-doubler-rectifier zero-voltage-switching pulsewidth-modulation full-bridge converter to alleviate the limit for the leakage inductance of the transformer. In this letter, the effect and calculation of the introduced resonant capacitor are analyzed and verified by a 540-W prototype converter.
A nonisolated fixed-ratio resonant switched-capacitor converter (RSCC) with high peak efficiency and high power density is encouraged as intermediate bus converter. With higher input voltages, stacked topologies achieve better component stress, but the relative current stress will be multiplied, e.g., ladder and Cockcroft–Walton …
In recent years, resonant switched-capacitors converters (ReSCC) proved to be a valid alternative to traditional buck converters, thanks to their key features such as very high power density, high efficiency, and capability of adjusting the output voltage through quasi-resonant operation. However, since the components count increases with the conversion …
This paper proposes an integrated regulated resonant switched-capacitor DC-DC converter for a 2.5 V to 1.2 V, 3 A conversion designed in a 130 nm CMOS technology. The voltage is regulated through a combined frequency/time shift on-chip controller that operates thanks to a zero-crossing detector for the tank current. By using such control technique, …
Here, a minimum resonant capacitor design approach is proposed for the insulated-gate bipolar transistor (IGBT)-based high-power LLC resonant converter to improve its comprehensive efficiency in the electric vehicle (EV) battery charging application.
Abstract: This paper presents research results of switching strategies of a power electronic resonant zero current switching (ZCS) DC-DC switched-capacitor voltage multiplier (SCVM). The SCVM can operate under the various switching methods, which determine the rated power of the converter, its efficiency, capacitors selection, as well as the input and …
The traditional pure switched-capacitor equalizer suffers from a large inrush current and low balance speed. An automatic parallel resonant switched-capacitor equalizer (PReSCE) for series-connected battery strings is proposed, which utilizes resonant switched-capacitor to eliminate the inrush current. The parallel ReSC converters not only minimizes output …
The integration of power supplies has the potential to reduce the form factor and cost of electronic systems. The resonance switched capacitor (ReSC) converters show a promising performance as it overcomes the charge-sharing losses in switched capacitor (SC) converters. However, the used inductors need an additional manufacture process. …
This paper proposes a new voltage-balancing circuit for the split dc voltages in a diode-clamped five-level inverter. The proposed circuit is based on a resonant switched-capacitor converter (RSCC), which consists of two half-bridge inverters, a resonant inductor, and a resonant capacitor. A new phase-shift control of the RSCC is …
Compared with conventional switched-capacitor (SC) converters with two operating phases, multi-phase SC converters can achieve the same conversion ratio with fewer capacitors and switches. This feature makes multi-phase SC converters an attractive candidate for applications with large conversion ratios. To further improve the …
Abstract: This paper introduces an active method for zero current switching for resonant switched capacitor converters (SCC) with wide dynamic range. The method is demonstrated on a binary SCC that features wide range of conversion ratios. Due to the resultant high efficiency of the converter operating under soft-switching conditions, it is …
Abstract: Isolated dc/dc converters play a key role in electric vehicle applications, and novel multiwinding resonant converters have recently been proposed for on-board and off-board charging applications. Some of these topologies have two series capacitors at the dc bus with a mid-point connection to the windings. Parameter mismatch due to manufacturing …
Abstract: In repetitive pulse power applications, the charging capacitor time occupies most of the time in a pulse period, and important parameters such as pulse repetition rate are restricted by the charging speed of the capacitor. To accelerate the charging speed and make full use of the components'' capacity, a novel adaptive optimization charging (AOC) …
Abstract: A resonant capacitor is introduced to the current-doubler-rectifier zero-voltage-switching pulsewidth-modulation full-bridge converter to alleviate the limit for the leakage inductance of the transformer. In this letter, the effect and calculation of the introduced resonant capacitor are analyzed and verified by a 540-W prototype converter.
To improve the comprehensive efficiency, the minimum resonant capacitor is proposed to reduce the turn-off losses, avoiding complex control or auxiliary circuit. Finally, the proposed approach is …
A resonant switched capacitor converter with high efficiency over a wide and continuous conversion ratio range is introduced. The efficiency of the topology depends primarily on the conduction losses and is decoupled, to a large extent, from the voltage conversion ratio. This is an advantage over classical switched capacitor …
This topic provides detailed information on designing a resonant half-bridge converter that uses two inductors (LL) and a capacitor (C), known as an LLC configuration. This topic …
Here, a minimum resonant capacitor design approach is proposed for the insulated-gate bipolar transistor (IGBT)-based high-power LLC resonant converter to improve its comprehensive efficiency in the …
A 500kW 1600V Zero-Voltage Switching Resonant Switched-Capacitor DC-DC Converter for Electric Trucks and Electric Aircraft Application Abstract: In contrast to the conventional 800V architecture found in electric trucks and electric aircraft batteries, the 1600V battery system has garnered more attention.
The existing time domain models for CLLLC class resonant converters have at least one of the following drawbacks: 1) the model cannot be applied for different resonant tanks and circuit topologies; 2) the effect of parasitic capacitors and deadtime is ignored; 3) large computation time is required to obtain steady state waveforms. To …
By adding Buck-type AC/AC converter to conventional power capacitor, dynamic capacitor (D-CAP) can be formed to compensate variable rather than fixed reactive power. However, some nonlinear distortion factors, namely grid harmonic voltage, voltage drop of switches and dead-time, would cause harmonics in its compensation current, …
Dry Film Capacitors for High-Frequency Power Electronics
This Letter proposes a constant frequency control of an LLC resonant converter using a switched capacitor. The experimental results show that the output voltage can be regulated in a wide load …
In repetitive pulse power applications, the charging capacitor time occupies most of the time in a pulse period, and important parameters such as pulse repetition rate are restricted by the charging speed of the capacitor. To accelerate the charging speed and make full use of the components'' capacity, a novel adaptive optimization charging (AOC) strategy is …