Current Mode Control for LLC Series Resonant DC-to-DC Converters

Jang, Jaeman; Pidaparthy, Syam Kumar; Choi, Byungcho

doi:10.3390/en8066098

Cited by 20 publications

(26 citation statements)

References 15 publications

(26 reference statements)

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“…To characterize the input voltage rejection, the PFC input voltage is applied by a combinated value of DC part and AC ripple part. Based on the AC line frequency of F line , the AC voltage part can be written as: (26) So, the corresponding output voltage can be calculated as: (27) Take the condition of f n > 1 for example, when the input varies from 405 V to 425 V based on an AC line frequency of 100 Hz, the calculation result of output from (27) is shown in the right part of Fig. 18, it reveals the average variation of output ripple is only 20 mVDC, which is consistent with the result of simulation shown in the left part of Fig.…”

Section: A the Closed Audio Susceptibility And Characteristic Of Ac mentioning

confidence: 99%

“…To solve this problem, several new LLC loop control schemes have been proposed in recent years. The first one is the average current control [26]− [27], in which the tank current has been sensed and scaled and then participate in the loop control, it is proved to be with the advantages over the DFC control on input ripple cancellation but still owns the room for the further improvement in terms of the load transient performance. The second one is the charge control [28], which compares the total input charge with the control voltage to modulate the switching frequency, then an inner current loop is offered to yield the fast-transient response.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on the Small Signal Characteristic Based on the LLC Hybrid Hysteretic Charge Control

Yang¹,

McDonald²,

Li³

2019

CPSS TPEA

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In this paper, an analytical small-signal model applied for hybrid hysteretic charge (HHC) control has been proposed and analyzed with the advantages over direct frequency control (DFC). Based on the approach of extended describing function method and average concept, for the first time, the systematical analytical open loop transfer functions from control to output, input to output, output impedance and the closed transfer functions of the overall loop, audio susceptibility and output impedance are proposed and verified through simulation. Additionally, some important physical insights have been extracted, analyzed and verified. Finally, the experiments on a design example of 12 VDC&12 A output power are conducted and verified. It shows that the calculations match well with the results from both the simulation and experiment, which reveals the proposed analytical transfer functions are very useful for the practical power design to achieve good prediction result. Index Terms-Analytical small signal model, hybrid hysteretic charge (HHC), hybrid hysteretic charge control, LLC, UCC25630.

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Section: A the Closed Audio Susceptibility And Characteristic Of Ac mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation on the Small Signal Characteristic Based on the LLC Hybrid Hysteretic Charge Control

Yang¹,

McDonald²,

Li³

2019

CPSS TPEA

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“…LLC converters have been utilized broadly in various DC converters as a result of their similar zero voltage Switching (ZVS) for the essential MOSFETs and zero current Switching (ZCS) for optional diodes, which enable them to achieve high proficiency and power thickness [40,41]. Typically, pulse width switching frequency modulation techniques is utilized as a part of LLC resonant converters to standardize the output current and voltage, yet the non-direct highlights of the input voltage make it difficult for ordinary linear control systems to accomplish the normal execution and a hybrid control scheme has been introduced for the purpose of switching [42,43].…”

Section: Introductionmentioning

confidence: 99%

Design of a Building-Integrated Photovoltaic System with a Novel Bi-Reflector PV System (BRPVS) and Optimal Control Mechanism: An Experimental Study

et al. 2018

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Environment protection and energy saving are the most attractive trends in zero-carbon buildings. The most promising and environmentally friendly technique is building integrated photovoltaics (BIPV), which can also replace conventional buildings based on non-renewable energy. Despite the recent advances in technology, the cost of BIPV systems is still very high. Hence, reducing the cost is a major challenge. This paper examines and validates the effectiveness of low-cost aluminum (Al) foil as a reflector. The design and the performance of planer-reflector for BIPV systems are analyzed in detail. A Bi-reflector solar PV system (BRPVS) with thin film Al-foil reflector and an LLC converter for a BIPV system is proposed and experimented with a 400-W prototype. A cadmium-sulfide (CdS) photo-resistor sensor and an Arduino-based algorithm was developed to control the working of the reflectors. Furthermore, the effect of Al-foil reflectors on the temperature of PV module has been examined. The developed LLC converter confirmed stable output voltage despite large variation in input voltage proving its effectiveness for the proposed BRPVS. The experimental results of the proposed BRPVS with an Al-reflector of the same size as that of the solar PV module offered an enhancement of 28.47% in the output power.Electronics 2018, 7, 119 2 of 22 the long-term cost of the building sector. Compared to a standalone PV system, BIPV does not require any extra land for installation and the cost can be balanced by installing this on the rooftop of the building structure [3]. However, the lower efficiency and higher initial cost make BIPV less practical and difficult to commercialize. Dye-Sensitized Solar Cells (DSSCs) have attracted considerable attention in recent years because of their simple assembly, lightweight, flexibility, economical price of materials, satisfactory photocurrent transformation efficiency, precise energy return time, and tunable optical properties [4]. On the other hand, DSSCs have power conversion efficiency of more than 14% with a limited active area; the output power decreases with increasing cell effective area of the photoanode [5]. An alternate solution exists to increase the net output power from the PV module to reduce the cost of the system because the initial cost of the PV system is the main hurdle to the widespread use of this technology. The output power can be increased by increasing the incident light on the PV system [6]. The position of the Sun is not fixed to one place because it changes its position from dawn to dusk and also during the entire year, which means that a fixed PV system is inefficient. Therefore, the tracking of single-and dual-axis PV systems are suggested for this purpose [7,8]. On the other hand, such a system has two disadvantages, increase in initial cost and decreased lifetime of the mechanical parts of the PV system. Moreover, such a system also requires extra power supply and motors to move the solar system, which makes the system more complex and increases the size of the ...

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“…Finally, for the impedance stability criterion, the stability of the cascade system is analyzed. This method was first proposed by Middlebrook when he studied the design of input filters of DC systems [12,13]. When a cascade system uses impedance analysis, firstly, each subsystem in the cascade system is simplified to set up the equivalent impedance model by using Norton's and Thevenin's theorems.…”

Section: Introductionmentioning

confidence: 99%

Impedance Modeling and Stability Analysis for Cascade System of Three-Phase PWM Rectifier and LLC Resonant Converter

Wang

Yu-yang

et al. 2018

Energies

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In this paper; the impedance model of PWM rectifier and LLC resonant converter are deduced, and the stability analysis of cascade system is studied. The principle of three-phase PWM rectifier is introduced; and the small signal model in d-q coordinate system is deduced. The expression of dc side output impedance model for PWM rectifier is derived. The LLC resonant converter is operated in a fixed-frequency state, and the LLC resonant converter is modeled as a small signal model. On this basis, the input impedance model expression of the LLC resonant converter is derived. According to the impedance stability criterion, it can seen that the amplitude of input impedance is greater than the amplitude of output impedance in a certain frequency domain. In addition, the Nyquist curve is not around the point (−1,0), which can judge that the cascade system is stable. In simulation software, a cascade system simulation is built and corresponding simulation curves are obtained, which verifies the stability of the cascade system.

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Current Mode Control for LLC Series Resonant DC-to-DC Converters

Cited by 20 publications

References 15 publications

Investigation on the Small Signal Characteristic Based on the LLC Hybrid Hysteretic Charge Control

Investigation on the Small Signal Characteristic Based on the LLC Hybrid Hysteretic Charge Control

Design of a Building-Integrated Photovoltaic System with a Novel Bi-Reflector PV System (BRPVS) and Optimal Control Mechanism: An Experimental Study

Impedance Modeling and Stability Analysis for Cascade System of Three-Phase PWM Rectifier and LLC Resonant Converter

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