High Accuracy Knee Voltage Detection for Primary-Side Control in Flyback Battery Charger
| Autor: | Ke-Horng Chen, Hsin Chen, Chao-Chang Chiu, Tsung-Hsun Tsai, Tsung-Yen Tsai, Shang-Hsien Yang, Ying-Hsi Lin, Jian-Ru Lin |
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| Rok vydání: | 2017 |
| Předmět: |
business.industry
Computer science 020208 electrical & electronic engineering Flyback transformer Electrical engineering 02 engineering and technology Constant power circuit Battery charger Control theory Dropout voltage Hardware_INTEGRATEDCIRCUITS 0202 electrical engineering electronic engineering information engineering Snubber Constant current RLC circuit 020201 artificial intelligence & image processing Electrical and Electronic Engineering business Voltage |
| Zdroj: | IEEE Transactions on Circuits and Systems I: Regular Papers. 64:1003-1012 |
| ISSN: | 1558-0806 1549-8328 |
| DOI: | 10.1109/tcsi.2016.2624743 |
| Popis: | In a primary-side control flyback charger, the accuracy of a conventional knee voltage detection (KVD) approach to obtain the output voltage is influenced by the inclusion of a snubber circuit. Although the snubber circuit dampens the ringing voltages due to switching, it also affect the resonance frequency which would reduce the timing of the sampling circuit, resulting in the inaccurate sampling of output voltage. By analyzing the snubber circuit and its resonance on the primary side, this paper implements a proposed accuracy knee voltage detection (AKVD) technique to compensate for the induced resonance frequency. Furthermore, the proposed constant current (CC) regulator ensures the accuracy of CC mode by compensating the sensing current error caused by the switching delay of the power transistor. A prototype consisting of a test chip fabricated with a $0.5\mu \text {m}$ BCD process demonstrates a voltage accuracy exceeding 99.63%. This is achieved by mitigating abnormal detections and thus ensuring correct control of charging current throughout the charging period. |
| Databáze: | OpenAIRE |
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