r LLC converters used in solar photovoltaic (PV) energy stor ge systems. A 350 W LLC converter example was examined and demonstrated. The efficiency performance is very consistent across the op Index Terms-- LLC resonant converter, PV energy storage system, high
Distributed energy generation systems with energy storage and microgrids have attracted increasing research interest in recent years. Therefore, multi-ports dc-
The converter combines an input source (port-1), storage (port-2), and output (port-3) by integrating an asymmetric fixed-frequency full-bridge LLC network with a cascaded H-bridge topology.
Due to low switching losses, LLC resonant converter is able to operate at high switching frequencies, while maintaining high efficiency LLC resonant converter design needs to find a suitable magnetizing inductor to ensure small conduction losses and switching losses
In this paper, we introduce the bidirectional converter topology and its control strategy for the DC microgrid battery energy storage system. Finally, a 500 W prototype is built to verify the effectiveness of the proposed
This document discusses the principles of resonant circuits and soft switching and describes application examples of LLC resonant converters and resonant inverters (an inductive-heating circuit and a discharge tube drive).
In this paper, we introduce the bidirectional converter topology and its control strategy for the DC microgrid battery energy storage system. Finally, a 500 W prototype is built to verify the effectiveness of the proposed converter.
The variable inductor-controlled LLC resonant converter achieves output voltage stabilization by designing the resonant inductor as a variable inductor and chan
G. E. Gamache and C. R. Sullivan, "Resonant converter transformer design and optimization," in Energy Conversion Congress and Exposition (ECCE), 2011 IEEE, 2011, pp. 590–597.
This paper proposes the utilization of a TPC operating as a dc transformer with a distributed LLC resonant tank to interconnect PV arrays with independent MPPT, an energy storage system and a grid connected inverter for household applications.
To verify the feasibility of the circuit topology and the proposed control strategy in this paper, an experimental platform of a dual-input LLC resonant converter for PV energy storage, as shown in Fig. 11, is constructed using the main parameters in Table 1.
The LLC resonant converter generates a square -wave voltage at a duty cycle close to 50%, which is converted into a nearly sinusoidal current with an LLC resonant circuit. Since the LLC resonant converter suppresses harmonics and allows ZVS soft-switching operation, it is widely used for applications requiring high efficiency and low EMI noise.
Resonant Converters • International Electrotechnical Commission definition: • Resonant converter: • converter using (a) resonant circuit(s) to provide commutation or to reduce switching losses • Today’s design examples: • Full bridge LLC dc- dc converter • P = 3.3 kW • V in = 400 V • V out = 250-450 V • Half-bridge LLC dc-dc converter
The LLC resonant converter is suitable for soft switching but encounters problems when used in bidirectional operation. When the converter supplies energy in the backward direction, the magnetizing inductance of the transformer is embedded in the output voltage.
The circuit on the primary side of an LLC resonant converter can be replaced with a sinusoidal power source (iac) as shown in Figure 3.16. An AC voltage with a square waveform (vin2) appears at the input of the rectifier circuit on the secondary side.
An LLC resonant circuit has two different resonant frequencies: a fixed resonant frequency (fr) that is a function of Lrand Crand a resonant frequency (fm) that is determined by (Lr+ Lm) and Cr. (fm varies with Ro’ connected in parallel with Lm.) Figure 3.2 Equivalent circuit for LLC resonance (c) A rectifier and an output circuit
Series Load Resonant Converter Analysis The proposed LC-SRC resonant converter is designed to reduce electromagnetic interference and harmonic distortion because the inductive reactance of the inductor is equal to the capacitive reactance in the resonant case, thereby generating the resonant frequency.
