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Average inductor current sensor for digitally-controlled switched-mode power supplies

Author:
Rodríguez González, MiguelUniovi authority; López Martín, Víctor Manuel; Azcondo Sánchez, Francisco Javier; Sebastián Zúñiga, Francisco JavierUniovi authority; Maksimovic, Dragan
Publication date:
2012
Publisher version:
http://dx.doi.org/10.1109/TPEL.2012.2183893
Citación:
IEEE Transactions on Power Electronics, 27(8), p. 3795-3806 (2012); doi:10.1109/TPEL.2012.2183893
Descripción física:
p. 3795-3806
Abstract:

Current-mode control in digitally controlled switched-mode power supplies typically requires analog-to-digital (A/D) conversion of at least two signals, voltage, and current. The complexity of voltage A/D converters can be reduced using window A/D techniques. In conventional current A/D conversion, however, relatively high resolution is required over a wide range of signals, which results in increased complexity, power consumption, and cost of the controller. This paper proposes a very simple feedback sensor capable of high-resolution average inductor current sensing using two analog comparators and an analog low-pass filter. The approach requires very few external components and employs minimal digital hardware resources. A dynamic model and performance of the average inductor current sensor are experimentally verified on a 12-V input, 19-V output, 50-W boost converter prototype. The applicability of the proposed sensor is demonstrated in a digitally controlled 400-W, 400-V output Boost power factor preregulator

Current-mode control in digitally controlled switched-mode power supplies typically requires analog-to-digital (A/D) conversion of at least two signals, voltage, and current. The complexity of voltage A/D converters can be reduced using window A/D techniques. In conventional current A/D conversion, however, relatively high resolution is required over a wide range of signals, which results in increased complexity, power consumption, and cost of the controller. This paper proposes a very simple feedback sensor capable of high-resolution average inductor current sensing using two analog comparators and an analog low-pass filter. The approach requires very few external components and employs minimal digital hardware resources. A dynamic model and performance of the average inductor current sensor are experimentally verified on a 12-V input, 19-V output, 50-W boost converter prototype. The applicability of the proposed sensor is demonstrated in a digitally controlled 400-W, 400-V output Boost power factor preregulator

URI:
http://hdl.handle.net/10651/19555
ISSN:
0885-8993
DOI:
10.1109/TPEL.2012.2183893
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