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- Title
High-Precision Digital Constant Current Controller with Demagnetization-Time Compensation for Primary-Side Regulation Flyback Converter.
- Authors
Chang, Changyuan; Huang, Xiaomin; Li, Yuanye; Chen, Yao
- Abstract
A novel digital constant output current controller with demagnetization-time compensation for flyback converter is proposed in this paper. The secondary winding demagnetization time is sampled from the comparison module output signal by output voltage sampling state machine. The ratio between and switching period 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 acquired from a look-up table, is utilized to compensate the impacts caused by the delay from the process of sampling the signal of . 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 1% in a wide range of universal-input AC voltage from 110V to 240V and the voltage load range between 2V and 8V.
- Subjects
CONSTANT current sources; DEMAGNETIZATION; CASCADE converters; SIGNAL processing; LOAD regulation (Electric power)
- Publication
Journal of Circuits, Systems & Computers, 2016, Vol 25, Issue 8, p-1
- ISSN
0218-1266
- Publication type
Article
- DOI
10.1142/S021812661650095X