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An adaptive secondary-side digital control is proposed for the series resonant converter to solve the loss of ZVS under certain input and load conditions, making it a good candidate for MHz 48V voltage regulators (VRs). By means of varying AC equivalent resistance, the output voltage regulation is achieved by controlling the duty cycle of the synchronous MOSFET. An additional control variable has...
This paper introduces a novel bridgeless resonant ac-to-dc converter, capable of efficiently converting arbitrary low-amplitude input voltages into a regulated dc voltage. High-frequency resonant operation owing to LC resonance allows small footprint for passive components, thereby increasing the circuit power density without suffering from switching losses. A resonant gate drive circuit is designed...
With voltage-balancing control, the voltage difference among sub-module (SM) capacitors in a modular multilevel converter can be reduced. However, this comes at the cost of increased device switching frequency. In this paper, the relationship between the switching frequency and SM capacitor unbalanced voltage is investigated. As the relationship depends on the voltage-balancing control schemes, a...
This paper presents adaptive ripple-based constant on-time control architecture for buck converter ICs with wide duty ratio applications. An internal ramp compensation with emulating inductor current ripple is implemented to solve the ripple oscillation instability issue when using low-ESR output capacitors in buck converters. Therefore, no external compensation is required to simplify the system...
This paper proposes a simple control scheme to eliminate the lower order harmonics in the line currents of the Front End Converter (FEC) of a 100 kVA Transformerless Intelligent Power Substation (TIPS) connected to the medium voltage (13.8 kV) grid through an LCL filter. Due to medium voltage (13.8 kV) and low power (100 kVA) specification for the FEC, the control technique needs to be specially designed...
In recent years, embedding ancillary functions of distributed generation (DG) have drawn great attention due to the increasing penetration of renewable energy based DG such as photovoltaic, wind turbines and fuel cells. Among these ancillary functions, harmonics compensation is becoming more interesting and important with the growth of nonlinear loads in today's power distribution system. When controlled...
This paper presents a fully integrated, four-phase, DC-DC switching converter with fast transient response. By applying effective clock and phase synchronization schemes to a current-mode hysteretic control, the multiphase converter achieves ripple cancellation and fast transient response seamlessly. Thanks to the very high frequency (VHF) operation (200 MHz) and the multiphase interleaving topology,...
In this paper, a proposed pulse width modulation (PWM) control method for the isolated current-mode resonant DC-DC converter with MHz level switching frequency is presented. The circuit topology is same as a conventional resonant converter with synchronous rectification and without any additional components. The control technique for the output voltage regulation is proposed with the unique PWM control...
This paper proposes a new hysteresis current control technique for a grid connected single-phase three-level quasi-Z-source inverter. This control algorithm could be applied in any three-level inverter with Z- or quasi-Z-source network where reference current control signal along with shoot-through states is used. To explain the operation principle of the algorithm the steady state analysis is presented...
This paper presents a new power conversion architecture for single-phase grid interface. The proposed architecture is suitable for realizing miniaturized ac-dc converters operating at high frequencies (HF, above 3 MHz) and high power factor, without the need for electrolytic capacitors. It comprises of a line-frequency rectifier, a stack of capacitors, a set of regulating converters, and a power combining...
Against conventional wisdom, asymmetrical interleaving strategy is proposed for two-phase interleaved LLC resonant DC/DC running at the same switching frequency to guarantee the equilibrium point of current sharing under all operation condition. Basing this strategy, adaptive-voltage-positioning (AVP) concept is further proposed for passive current sharing realization, while satisfying output voltage...
Switched-capacitor (SC) converters are becoming a strong candidate for high power density converters. Traditionally, these SC converters have suffered from two main problems: capacitor charge transfer loss and lossy output voltage regulation. This paper proposes a hybrid SC converter topology that addresses both problems simultaneously. The proposed topology adds a single small inductor to the SC...
A single-phase Dual Active Half Bridge (DAHB) DC-DC converter topology is evaluated for medium voltage (MV) application. A 15kV SiC-IGBT based three-level half-bridge is connected to the high voltage (HV) primary side of a high frequency (HF) transformer operating at 10kHz link-frequency. A 1200V SiC-MOSFET based two-level H-bridge is connected on the low voltage (LV) secondary side. This topology...
Development of fast charging stations is expected to reduce the charging time required by Electric Vehicles (EVs) and Plug-in Hybrid Electric Vehicles (PHEVs). Fast charging stations require the rectification of the grid AC voltage to a DC voltage while maintaining high power factor (PF) and low total harmonic distortion (THD) on the grid side. Furthermore, the chargers must be able to provide a controllable...
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