Sensors 2014, 14(5), 8851-8868; doi:10.3390/s140508851
Article

An Optimal Current Observer for Predictive Current Controlled Buck DC-DC Converters

1email, 1email, 1email, 1,* email, 1email and 2email
Received: 16 March 2014; in revised form: 9 May 2014 / Accepted: 12 May 2014 / Published: 19 May 2014
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: In digital current mode controlled DC-DC converters, conventional current sensors might not provide isolation at a minimized price, power loss and size. Therefore, a current observer which can be realized based on the digital circuit itself, is a possible substitute. However, the observed current may diverge due to the parasitic resistors and the forward conduction voltage of the diode. Moreover, the divergence of the observed current will cause steady state errors in the output voltage. In this paper, an optimal current observer is proposed. It achieves the highest observation accuracy by compensating for all the known parasitic parameters. By employing the optimal current observer-based predictive current controller, a buck converter is implemented. The converter has a convergently and accurately observed inductor current, and shows preferable transient response than the conventional voltage mode controlled converter. Besides, costs, power loss and size are minimized since the strategy requires no additional hardware for current sensing. The effectiveness of the proposed optimal current observer is demonstrated experimentally.
Keywords: converter; DC-DC; buck; PCC; observer
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MDPI and ACS Style

Min, R.; Chen, C.; Zhang, X.; Zou, X.; Tong, Q.; Zhang, Q. An Optimal Current Observer for Predictive Current Controlled Buck DC-DC Converters. Sensors 2014, 14, 8851-8868.

AMA Style

Min R, Chen C, Zhang X, Zou X, Tong Q, Zhang Q. An Optimal Current Observer for Predictive Current Controlled Buck DC-DC Converters. Sensors. 2014; 14(5):8851-8868.

Chicago/Turabian Style

Min, Run; Chen, Chen; Zhang, Xiaodong; Zou, Xuecheng; Tong, Qiaoling; Zhang, Qiao. 2014. "An Optimal Current Observer for Predictive Current Controlled Buck DC-DC Converters." Sensors 14, no. 5: 8851-8868.

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