Evaluation of primary side control schemes for flyback converter with constant current output

2013 ◽  
Author(s):  
Xiliang Chen ◽  
Tianyang Jiang ◽  
Siyang Zhao ◽  
Hulong Zeng ◽  
Junming Zhang
Keyword(s):  
Constant Current ◽  
Current Output ◽  
Flyback Converter ◽  
Control Schemes

High-Precision Digital Constant Current Controller with Demagnetization-Time Compensation for Primary-Side Regulation Flyback Converter

2016 ◽  
Vol 25 (08) ◽  
pp. 1650095 ◽  
Author(s):  
Changyuan Chang ◽  
Xiaomin Huang ◽  
Yuanye Li ◽  
Yao Chen
Keyword(s):  
Constant Current ◽  
Output Current ◽  
Side Peak ◽  
Load Range ◽  
Current Output ◽  
Flyback Converter ◽  
Current Controller ◽  
Wide Range ◽  
Hardware Description ◽  
Constant Output

A novel digital constant output current controller with demagnetization-time compensation for flyback converter is proposed in this paper. The secondary winding demagnetization time [Formula: see text] is sampled from the comparison module output signal by output voltage sampling state machine. The ratio between [Formula: see text] and switching period [Formula: see text] is kept constant by bidirectional counter module to achieve constant output current based on invariable primary-side peak-current. Meanwhile, demagnetization-time compensation is proposed in order to enhance load regulation ratio. The compensation [Formula: see text] acquired from a look-up table, is utilized to compensate the impacts caused by the delay [Formula: see text] from the process of sampling the signal of [Formula: see text]. The digital controller (DC) is implemented by hardware description language Verilog HDL. Experimental results of the proposed 2A constant current output flyback converter based on FPGA(EP2C8Q208C8N) indicate that the constant current precision is within [Formula: see text]1% in a wide range of universal-input AC voltage from 110[Formula: see text]V to 240[Formula: see text]V and the voltage load range between 2[Formula: see text]V and 8[Formula: see text]V.

scholarly journals A Graphical Design Methodology Based on Ideal Gyrator and Transformer for Compensation Topology with Load-Independent Output in Inductive Power Transfer System

Electronics ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 575
Author(s):  
Qian Su ◽  
Xin Liu ◽  
Yan Li ◽  
Xiaosong Wang ◽  
Zhiqiang Wang ◽  
...  
Keyword(s):  
Phase Angle ◽  
Design Methodology ◽  
Constant Current ◽  
Current Gain ◽  
Transfer System ◽  
Power Transfer ◽  
Current Output ◽  
Inductive Power Transfer ◽  
Zero Phase ◽  
Inductive Power

Compensation is crucial in the inductive power transfer system to achieve load-independent constant voltage or constant current output, near-zero reactive power, higher design freedom, and zero-voltage switching of the driver circuit. This article proposes a simple, comprehensive, and innovative graphic design methodology for compensation topology to realize load-independent output at zero-phase-angle frequencies. Four types of graphical models of the loosely coupled transformer that utilize the ideal transformer and gyrator are presented. The combination of four types of models with the source-side/load-side conversion model can realize the load-independent output from the source to load. Instead of previous design methods of solving the equations derived from the circuits, the load-independent frequency, zero-phase angle (ZPA) conditions, and source-to-load voltage/current gain of the compensation topology can be intuitively obtained using the circuit model given in this paper. In addition, not limited to only research of the existing compensation topology, based on the design methodology in this paper, 12 novel compensation topologies that are free from the constraints of transformer parameters and independent of load variations are stated and verified by simulations. In addition, a novel prototype of primary-series inductor–capacitance–capacitance (S/LCC) topology is constructed to demonstrate the proposed design approach. The simulation and experimental results are consistent with the theory, indicating the correctness of the design method.

scholarly journals Dimmable High Power LED Driver Using Fuzzy Logic Controller

2021 ◽  
Vol 5 (2) ◽  
pp. 45
Author(s):  
Rizky Fatur Rochman ◽  
Eka Prasetyono ◽  
Rachma Prilian Eviningsih
Keyword(s):  
Fuzzy Logic ◽  
Fuzzy Logic Controller ◽  
Constant Current ◽  
Led Driver ◽  
Flyback Converter ◽  
Compact Size ◽  
Wide Range ◽  
Driver Circuit ◽  
Converter Topology ◽  
Lighting Loads

The use of lighting loads is one of the crucial matters which increases every year. The increasing use then leads to the development of brighter and longer-lasting sources. In addition, the conventional use of lighting loads today, which only emit light at its maximum intensity, does not allow the consumers to adjust the brightness level as needed. Consequently, this condition may cause energy wastage. The LED lighting system is gaining popularity as it is widely used in a wide range of applications. The advantages of LEDs, such as its compact size and varied lamp colors, replace conventional lighting sources. The linear setting of the driver topology using the flyback converter was aimed to control the LEDs with a constant current in order to adjust the variation of the LED light intensity. The closed-loop driver circuit with flyback converter topology was designed as an LED driver with a given load specification from the LED string. A dimmable feature was included for adjusting the intensity of the light produced by the LEDs. Eventually, the fuzzy logic controller (FLC) method was applied to the integrated change setting to obtain a dynamic response.

A Misalignment Tolerant IPT System With Intermediate Coils for Constant-Current Output

2019 ◽  
Vol 34 (8) ◽  
pp. 7151-7155 ◽  
Author(s):  
Ruikun Mai ◽  
Bin Yang ◽  
Yang Chen ◽  
Naijian Yang ◽  
Zhengyou He ◽  
...  
Keyword(s):  
Constant Current ◽  
Current Output

scholarly journals A Compact Spatial Free-Positioning Wireless Charging System for Consumer Electronics Using a Three-Dimensional Transmitting Coil

Energies ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1409 ◽  
Author(s):  
Ziwei Liang ◽  
Jianqiang Wang ◽  
Yiming Zhang ◽  
Jiuchun Jiang ◽  
Zhengchao Yan ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Load Condition ◽  
Consumer Electronics ◽  
Constant Current ◽  
Receiver Design ◽  
Wireless Charging ◽  
Compensation Circuit ◽  
Current Output ◽  
Charging System ◽  
Compact Design

A compact spatial free-positioning wireless charging system with a novel three-dimensional (3D) transmitting (Tx) coil is proposed to charge consumer electronics in the working area. Because of the strengthened electromagnetic field generated by the proposed 3D Tx coil in the space, this system can charge consumer electronics wirelessly with great tolerance to positional and angular misalignments between the transmitter and receiver. Benefiting from the compact design of the 3D Tx coil, the system can be easily embedded in some corners of office furniture/cubic panels, which will not cause any extra working space consumption when charging devices. The inductor-capacitor-capacitor (LCC) compensation circuit on the Tx side can achieve constant current output, which is independent of load condition and can protect the transmitter. With the LCC compensation circuit, the MOSFETs of the H-bridge high-frequency inverter realized zero voltage switching (ZVS). The small-sized planar receiving (Rx) coil and series (S) compensation circuit is applied to achieve compact receiver design. The theoretical and experimental results show that the spatial free-positioning wireless charging prototype can transfer 5 W to the small-sized receiver in around 350 mm × 225 mm × 200 mm 3D charging area and achieve the highest efficiency of 77.9%.

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