- 标题
- 摘要
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- 实验方案
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[IEEE 2019 IEEE 4th International Future Energy Electronics Conference (IFEEC) - Singapore, Singapore (2019.11.25-2019.11.28)] 2019 IEEE 4th International Future Energy Electronics Conference (IFEEC) - Design and Implementation of Active Bleeder for TRIAC Dimmable LED Driver
摘要： In this paper, implementation of active bleeder for TRIAC dimmable LED driver is presented. The insufficient holding current problem occurs when LED driver is connected to TRIAC dimmer, causing TRIAC dimmer misfire and LED flicker. Therefore, a bleeder circuit is parallel-connected to provide TRIAC enough holding current. In the bleeder, the resistor is usually used to control the amount of current through the bleeder, and cause high power loss on the resistor. A bleeder circuit with an inductor, a capacitor and switches is used to provide TRIAC dimmer extra current to reduce the power dissipation by using a resistor. Finally, the hardware type of the bleeder circuit with input voltage of 90~135V is implemented, and able to applied on the TRIAC dimmable 7.2W LED driver. The bleeder can provide enough holding current, widening the conducting angle of TRIAC dimmer with no flicker and misfire occur.
关键词： LED driver,Flyback,bleeder circuit,TRIAC dimmer
更新于2025-09-19 17:13:59
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[IEEE 2019 International Conference on Electrical Drives & Power Electronics (EDPE) - The High Tatras, Slovakia (2019.9.24-2019.9.26)] 2019 International Conference on Electrical Drives & Power Electronics (EDPE) - Experimental DC/DC Converter for Photovoltaic Panel with Fully Digital Control Based on Flyback Topology with Nontraditional Snubber Circuit
摘要： This paper deals with the design, simulation and construction of a switching mode power supply. The power supply is especially intended for one photovoltaic panel with 24 V output voltage and 250 W peak power. The supply is based on a flyback topology with nontraditional passive non-dissipative snubber circuit. The entire converter was simulated in the MATLAB Simulink. The converter is fully digital controlled by a STM32F334 microcontroller with a cascade control loop. The selected topology, fundamental simulation of the converter, snubber circuit and strategy of control and constructed converter are included in this paper. The converter can be used with another same converter for creating a small off grid photovoltaic system.
关键词： maximum power point tracking,photovoltaic,passive snubber,digital control,MATLAB Simulink,flyback
更新于2025-09-16 10:30:52
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Maximum power point tracking in photovoltaic systems under different operational conditions by using ZA-INC algorithm
摘要： Today, environmental pollution has increased due to excess use of fossil resources. Amidst, renewable energy resources, solar energy is one of the infinite, clean and accessible options. Each solar cell has a unique operating point which is called maximum power point. Considering nonlinearity of I–V and P–V curves of Photovoltaic (PV) resources, their delivered power depends on operating point of the PV. That is, for changes in temperature or irradiation, some actions should be taken to obtain maximum operating point which is called maximum power point tracking (MPPT). This paper tries to configure power circuit using distributed maximum power point tracking (DMPPT) with a fly-back converter, optimize power and reduce fluctuations around maximum power point. MPPT is analyzed through simulation using P&O, INC and zero fluctuation, adaptive step, increasing (ZA-INC) guidance algorithms in two steps including variable irradiation with constant temperature and variable temperature with constant irradiation using DMPPT and centralized MPPT. In DMPPT scheme using ZA-INC algorithm, power is optimized, losses are reduced, fluctuations around maximum power point are reduced, gain and tracking speed are increased.
关键词： MPPT,Weather conditions,Photovoltaic,ZA-INC algorithm,Flyback converter
更新于2025-09-12 10:27:22
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New electrolytic capacitor-less LED driver based on model predictive control
摘要： The lifetime of light-emitting diode (LED) drivers is mainly affected by electrolytic capacitors. Therefore, it is necessary to eliminate electrolytic capacitors from LED drivers. Firstly, basic concept of LED driver without electrolytic capacitors is addressed in this paper. Then, a new electrolytic capacitor-less LED driver is proposed and its operation principles are analyzed in detail. In order to achieve better control effect, model predictive control (MPC) strategy is introduced in this topology. Following that, the mathematical model of the circuit which adopts MPC is derived. Finally, simulations and experiments on a 24 V, 3A laboratory prototype are carried out to verify the feasibility of the proposed topology and control strategy.
关键词： Flyback,Model predictive control,LED driver,Bidirectional cuk,Electrolytic capacitor-less
更新于2025-09-11 14:15:04
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[IEEE 2018 IEEE 6th Workshop on Wide Bandgap Power Devices and Applications (WiPDA) - Atlanta, GA, USA (2018.10.31-2018.11.2)] 2018 IEEE 6th Workshop on Wide Bandgap Power Devices and Applications (WiPDA) - A New Series Hybrid DC-DC Converter for Wide Input Range with SiC
摘要： A new series hybrid DC-DC converter targeting for communication power supply with wide input range is designed in this paper implemented with Silicon Carbide (SiC) power transistor. The proposed hybrid converter is a combination of forward and flyback converter with full usage of transformer energy and optimized efficiency. Forward converter is the main energy delivery part and resonant network is utilized for full energy transferring and soft switching. Forward converter resets the magnetizing energy and delivers it to the output. The forward and flyback part are connected in such a novel way where flyback output is in series with the primary side. A highly compact architecture is realized with single core, multi-winding shared power transformer. Due to low gate charge and parasitic capacitance, SiC devices are premium power transistors for high frequency and high power applications. With a proper transformer design, an efficient series hybrid SiC converter is demonstrated for 100V-to-400V input at 480W output power.
关键词： Resonant secondary,Series hybrid,SiC,Wide input range,ZCS,cascaded flyback
更新于2025-09-04 15:30:14