on-Time Mismatch Based System Identification Technique for Buck Converters
| Autor: | Marc Kanzian, Harald Gietler, Christoph Unterrieder, Mario Huemer, Hubert Zangl, Robert Priewasser, Andreas Berger |
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| Rok vydání: | 2020 |
| Předmět: |
Adaptive control
Computer science Buck converter 020208 electrical & electronic engineering Natural frequency Hardware_PERFORMANCEANDRELIABILITY 02 engineering and technology Capacitance Parasitic capacitance Control and Systems Engineering Control theory Hardware_INTEGRATEDCIRCUITS 0202 electrical engineering electronic engineering information engineering Node (circuits) Digital control Electrical and Electronic Engineering Power MOSFET Voltage Diode |
| Zdroj: | IEEE Transactions on Industrial Electronics. 67:7898-7908 |
| ISSN: | 1557-9948 0278-0046 |
| Popis: | This article introduces a fast and low-complexity natural frequency estimation concept for power converters, enabling their adaptive control. Neither a high-resolution analog-to-digital converter nor complex arithmetic operations, such as multiplications, are required by the proposed approach. Instead, the mismatch between the on -time of the control signal and the effective on -time at the switching node, occurring under light load conditions, is exploited. This mismatch is caused by the parasitic drain–source capacitance and the parasitic body diode of the power MOSFETs. It is not necessary that the value of the parasitic capacitance is known nor is it required to stay constant, e.g., over temperature. Due to its simplicity, the proposed method is well-suited for practical on-chip realizations. The introduced concept is experimentally verified on the example of a buck converter with different output filter sets. A digital controller is adaptively tuned based on the estimated natural frequency, resulting in an improved dynamic performance. For the presented converter, the magnitude of the output voltage transient in response to a load change was reduced by 30%. |
| Databáze: | OpenAIRE |
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