Pseudo-Constant Switching Frequency in On-Time Controlled Buck Converter with Predicting Correction Techniques
| Autor: | Chao-Cheng Lee, Wei-Chung Chen, Ying-Wei Chou, Meng-Wei Chien, Hsin-Chieh Chen, Shian-Ru Lin, Tsung-Yen Tsai, Ying-Hsi Lin, Ke-Horng Chen |
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| Rok vydání: | 2016 |
| Předmět: |
Discrete mathematics
Physics Current (mathematics) Buck converter 020208 electrical & electronic engineering Ripple Switching frequency Noise spectrum 02 engineering and technology 020202 computer hardware & architecture Control theory 0202 electrical engineering electronic engineering information engineering Correction technique Electrical and Electronic Engineering Constant (mathematics) Voltage |
| Zdroj: | IEEE Transactions on Power Electronics. 31:3650-3662 |
| ISSN: | 1941-0107 0885-8993 |
| DOI: | 10.1109/tpel.2015.2457571 |
| Popis: | The predicting correction technique (PCT) is proposed to achieve an adaptive on-time control for ripple-based buck converters. The switching frequency $f_{{\rm SW}}$ variation is suppressed when the PCT technique considers complete parasitic resistances of the components and devices. Even without extra clock-controlled circuits and current sensing circuits, the buck converter operates with a nearly constant $f_{{\rm SW}}$ over a wide load range. Parasitic resistances almost cause no influence and restriction on $f_{{\rm SW}}$ . Only input voltage is used to predict the adaptive on-time. Measurement results show only 0.32% in $\Delta f_{{\rm SW}}/f_{{\rm SW}}$ and 5.7 kHz/A in $\Delta f_{{\rm SW}}/\Delta I_{{\rm LOAD}}$ in case of 1.4 A load current change and $f_{{\rm SW}}$ is 2.5 MHz. Consequently, a pseudo-constant $f_{{\rm SW}}$ with well-defined noise spectrum strongly benefits the solution of electromagnetic interference (EMI) for system-on-a-chip (SoC) applications. |
| Databáze: | OpenAIRE |
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