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- 2018
- dual-input LLC
- DC gain analysis
- independent MPPT
- PWM phase shift
- LLC resonant converter
- Electrical Engineering and Automation
- University of Central Florida
- Nanjing University of Aeronautics and Astronautics
- Infineon Technologies
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[IEEE 2018 IEEE Energy Conversion Congress and Exposition (ECCE) - Portland, OR, USA (2018.9.23-2018.9.27)] 2018 IEEE Energy Conversion Congress and Exposition (ECCE) - Design and Implementation of a Dual-Input LLC Converter for PV-Battery Applications
摘要： This paper proposes a dual-input LLC resonant converter that interfaces with one PV panel and one battery energy storage system (BESS). The topology is a dual half-bridge LLC circuit with four active switches. This topology allows the two sources to share the same resonant tank for transferring energy to the load without the need for additional circuit components. A phase-shift pulse width modulation (PWM) control is employed to implement maximum power point tracking (MPPT) for PV panel and duty cycle is controlled to regulate battery current. The converter voltage gain is controlled by varying the operating frequency as in a typical LLC resonant converter. Zero-voltage-switching (ZVS) is realized in all switches over the entire range of source voltage and load conditions. In addition, voltage stress across switches does not exceed the input voltage. A simulation study was carried out to validate the operating principles of the proposed topology. The input voltage range of the PV source was selected to be 25 V to 50 V and the nominal input voltage of battery was 60 V with an output voltage regulated at 200 V DC.
关键词： battery energy storage,LLC resonant converter,dual-input LLC,microinverters
更新于2025-09-23 15:22:29
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Design and Implementation of 150 W AC/DC LED Driver with Unity Power Factor, Low THD, and Dimming Capability
摘要： This paper presents the implementation of a two-stage light-emitting diode (LED) driver based on commercial integrated circuits (IC). The presented LED driver circuit topology, which is designed to drive a 150 W LED module, consists of two stages: AC-DC power factor correction (PFC) stage and DC/DC power converter stage. The implementation of the PFC stage uses IC NCP1608, which uses the critical conduction mode to guarantee a unity input power factor with a wide range of input voltages. The DC/DC power converter with soft-switching characteristics for the entire load range uses IC FLS2100XS. Furthermore, the design of an electromagnetic interference (EMI) filter for the LED driver and the dimming control circuit are discussed in detail. The hardware prototype, an LED lighting system, with a rated power of 150 W/32 V from a nominal 220 V/50 Hz AC voltage supply was tested to show the effectiveness of the design. The presented LED driver was tested for street lighting, and the experimental results show that the power factor (PF) was higher than 0.97, the total harmonics distortion (THD) was lower than 7%, and the efficiency was 91.7% at full load. The results prove that the performance of the presented LED driver complies with the standards: IEC61000-3-2 and CIRSP 15:2009.
关键词： EMI filter,power factor correction,LED driver,LLC resonant converter
更新于2025-09-23 15:19:57
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High Voltage, Low Current High-Power Multichannel LEDs LLC Driver by Stacking Single-Ended Rectifiers with Balancing Capacitors
摘要： In this paper, a new LLC converter for series-connected, high-voltage LEDs is proposed. The proposed LLC converter consists of two stacked, single-ended recti?ers and one balancing capacitor, to compensate for the current deviation of two individual LED strings. The proposed LLC LED driver can use a diode with low voltage stress, even if the secondary LED is connected in series to have a high driving voltage. In addition, even if several series-connected LEDs are changed into two-stacked structures, the balancing capacitor can compensate for the current deviation of the two separated LEDs, as well as the di?erence in leakage inductance of the two stacked single-ended recti?ers. The balancing capacitor can be made equal to the voltage tolerance of the stacked, single-ended recti?er diodes. The proposed circuit can be easily extended to a series channel LED driver circuit, without increasing the voltage stress. To verify the characteristics and operation of the proposed LLC LED driver, a 260W high-power LED driver is implemented.
关键词： high-power LED light,stacked single-end recti?er,balancing capacitor,LLC LED driver
更新于2025-09-23 15:19:57
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[IEEE 2019 8th International Conference on Power Systems (ICPS) - Jaipur, India (2019.12.20-2019.12.22)] 2019 8th International Conference on Power Systems (ICPS) - An Efficient LLC Resonant Converter Design for Photovoltaic Application
摘要： This paper presents a novel design procedure to the LLC resonant converter for improve the ef?ciency of photovoltaic (PV) applications. State of the art LLC resonant converter operates either in buck or boost mode by operating at a switching frequency higher or lower than the resonant frequency respectively. However, such operation of the converter at a switching frequency other than the resonant frequency may result in increased turn off losses for MOSFET, conduction losses, and hard commutation for the recti?er diodes which reduces the ef?ciency of the converter. In this paper, a design procedure is proposed where the converter operates very close to the resonant frequency (10% margin) in buck and boost mode of operation to improve the ef?ciency of the converter. The design procedure mainly involves the control of the transformer tap ratio such that the converter operates near the resonant frequency. Since the transformer tap changing control is slow in nature, the proposed control strategy is mainly suited for photovoltaic application where the input voltage to the converter does not change rapidly during the daytime. The transformer tap control is suggested based on the historical data for solar energy, i.e. recorded temperature and solar irradiance. On changing the transformer tap ratio according to the input voltage, the switching frequency is observed to be moving towards the resonant frequency of the LLC resonant converter. Simulations for both the boost and buck mode operation of the resonant tank of the converter are performed, and with the proposed control higher ef?ciency is achieved for PV applications.
关键词： switching frequency,conduction losses,LLC Resonant Converter,turn-off losses
更新于2025-09-23 15:19:57
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[IEEE IECON 2018 - 44th Annual Conference of the IEEE Industrial Electronics Society - D.C., DC, USA (2018.10.21-2018.10.23)] IECON 2018 - 44th Annual Conference of the IEEE Industrial Electronics Society - An Exact Time Domain Analysis of DCM Boost Mode LLC Resonant Converter for PV applications
摘要： The search for a cost feasible, optimal design of LLC converter for wide input voltage range conditions is inhibited by errors in steady state values of peak gain, tank current, tank voltage, active power etc., due to various approximations in the analysis. This leads to erroneous selection of circuit parameters. The present work provides an exact, approximation free time domain mathematical model of LLC converter operating in transformer secondary current discontinuous mode (DCM) below resonance in boost mode. The proposed approach defines voltage gain as a function of relative switching frequency (ω) and td, which represents the rectifier diode to switch conduction ratio for DCM operation. Existing works have defined voltage gain as an explicit function of quality factor (Q) and ω. The current approach leads to accurate derivation of converter voltage gain, tank RMS current, tank capacitor voltage, zero voltage switching (ZVS) angle etc. Analytical expressions are validated with simulation studies using PSIM for various inductor ratio values. A final design is verified on an experimental prototype of 320W output LLC converter designed for an input range of 20-40V for solar PV applications.
关键词： LLC,peak gain,DCM,time domain
更新于2025-09-19 17:15:36
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[IEEE 2019 International Semiconductor Conference (CAS) - Sinaia, Romania (2019.10.9-2019.10.11)] 2019 International Semiconductor Conference (CAS) - Voltage Controlled Oscillator for Small-Signal Capacitance Sensing
摘要： SiC MOSFETs are applied to constitute a three-phase, 5-kW LLC series resonant dc/dc converter with isolation transformers. A switching frequency of around 200 kHz for the transistors successfully reduces the volume of these isolation transformers, whereas insulated-gate bipolar transistors (IGBTs) are not capable of achieving such a high switching speed. The high-voltage tolerance of SiC MOSFETs, 1200 V, enables increasing the input voltage up to 600 V. High-voltage tolerance, on the other hand, is not compatible with low on-resistance for Si MOSFETs. A three-phase circuit topology is used to achieve up to 5 kW of power capacity for the converter and reduce per-phase current at the same time. Current-balancing transformers among these three phases effectively suppress a maximum peak current from arising in the circuit, a technique that miniaturizes the input and output capacitances. The conversion efficiency of the converter reaches 97.6% at 5-kW operation.
关键词： SiC MOSFETs,zero-voltage switching (ZVS),Current-balancing transformers,zero-current switching (ZCS),three phase,LLC resonant converter
更新于2025-09-19 17:13:59
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A Novel Synchronous Current-Doubler Rectifier for LED Drivers Without Electrolytic Capacitors
摘要： High-brightness light-emitting diode (LED) lamps have attracted much attention because of their high efficiency, simple structure, energy conservation and environmental protection aspects, and long lifetime. Thus, an LED driver must have a long lifespan, high density, and compact space. However, conventional LED power supplies use an electrolytic capacitor as the storage capacitor in the holdup time, which has a short lifespan and occupies large space. In this paper, a novel synchronous current-doubler rectifier (SCDR) method is proposed as an LED driver. The reasonably designed circuit is used to control the output voltage ripple in the normal range without adding a complicated control circuit. The proposed topology is designed using few components, has no electrolytic capacitor, and has a low cost for high-output current LED driver applications. Circuit operating principles and detailed theoretical analysis are provided in this paper. A 200-W prototype has been established and tested, and the experimental results are presented to highlight the merits of the proposed circuit.
关键词： synchronous current-doubler rectifier (SCDR),LLC,light-emitting diode (LED),Electrolytic capacitor
更新于2025-09-19 17:13:59
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LLC Resonant Voltage Multiplier-Based Differential Power Processing Converter Using Voltage Divider with Reduced Voltage Stress for Series-Connected Photovoltaic Panels under Partial Shading
摘要： Partial shading on photovoltaic (PV) strings consisting of multiple panels connected in series is known to trigger severe issues, such as reduced energy yield and the occurrence of multiple power point maxima. Various kinds of differential power processing (DPP) converters have been proposed and developed to prevent partial shading issues. Voltage stresses of switches and capacitors in conventional DPP converters, however, are prone to soar with the number of panels connected in series, likely resulting in impaired converter performance and increased circuit volume. This paper proposes a DPP converter using an LLC resonant voltage multiplier (VM) with a voltage divider (VD) to reduce voltage stresses of switches and capacitors. The VD can be arbitrarily extended by adding switches and capacitors, and the voltage stresses can be further reduced by extending the VD. Experimental verification tests for four PV panels connected in series were performed emulating partial shading conditions in a laboratory and outdoor. The results demonstrated the proposed DPP converter successfully precluded the negative impacts of partial shading with mitigating the voltage stress issues.
关键词： LLC converter,differential power processing converter,voltage multiplier,voltage divider,photovoltaic system,partial shading
更新于2025-09-16 10:30:52
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[IEEE IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society - Lisbon, Portugal (2019.10.14-2019.10.17)] IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society - Comparative Analysis between the Half Brige Resonant LLC and Buck Converters as the Power Stage of an LED Driver
摘要： This paper presents a comparative analysis between the Buck Converter and the LLC Resonant Converter working as LED drivers. These converters are placed after a Power-Factor-Correction (PFC) stage, in order to work as the Power-Control (PC) stage of two-stage LED drivers. The main objective of this study is to evaluate these converters in terms of efficiency, volume and cost using different switching frequencies supplying an LED load of 180W. The methodology used theoretical losses calculation and industrial feedback in order to compare the proposed converters. The Buck converter was evaluated under 33kHz, 60kHz and 100kHz, and the LLC Resonant converter was evaluated under 100kHz, 140kHz, 180kHz, and 220kHz. Both converters were dimmed from 100% to 20%.
关键词： LED Driver,Resonant Converter,LLC
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE 10th International Symposium on Power Electronics for Distributed Generation Systems (PEDG) - Xi'an, China (2019.6.3-2019.6.6)] 2019 IEEE 10th International Symposium on Power Electronics for Distributed Generation Systems (PEDG) - An LED Driver with Adjustable Output Current
摘要： In many occasions, it is necessary to remotely adjust the brightness of the LED and monitor the working state of the LED driving power. Aiming at this goal, this paper designs an LED driver with adjustable output current. The main structure of the circuit adopts APFC+LLC. The driving power is internally equipped with a power measurement module and a relay switch module, and the external power supply is equipped with wireless control module. It can realize adjust the LED light, and can also monitor the power consumption, input voltage, input current, power factor, output voltage and output current of the driving power supply.
关键词： APFC,Adjustable output current,Electric energy measurement,LLC,LED driver
更新于2025-09-12 10:27:22