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Energies 2017, 10(10), 1610; doi:10.3390/en10101610

A Digital Hysteresis Current Control for Half-Bridge Inverters with Constrained Switching Frequency

Internet of Energy Laboratory, Department of Technology Management for Innovation, The University of Tokyo, Tokyo 113-8656, Japan
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Received: 7 September 2017 / Revised: 9 October 2017 / Accepted: 12 October 2017 / Published: 14 October 2017
(This article belongs to the Special Issue Power Electronics and Power Quality)
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Abstract

This paper proposes a new robustly adaptive hysteresis current digital control algorithm for half-bridge inverters, which plays an important role in electric power, and in various applications in electronic systems. The proposed control algorithm is assumed to be implemented on a high-speed Field Programmable Gate Array (FPGA) circuit, using measured data with high sampling frequency. The hysteresis current band is computed in each switching modulation period based on both the current error and the negative half switching period during the previous modulation period, in addition to the conventionally used voltages measured at computation instants. The proposed control algorithm is derived by solving the optimization problem—where the switching frequency is always constrained at below the desired constant frequency—which is not guaranteed by the conventional method. The optimization problem also keeps the output current stable around the reference, and minimizes power loss. Simulation results show good performances of the proposed algorithm compared with the conventional one. View Full-Text
Keywords: half-bridge inverters; digital control; hysteresis current control; switching frequency; optimization half-bridge inverters; digital control; hysteresis current control; switching frequency; optimization
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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. (CC BY 4.0).

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Nguyen-Van, T.; Abe, R.; Tanaka, K. A Digital Hysteresis Current Control for Half-Bridge Inverters with Constrained Switching Frequency. Energies 2017, 10, 1610.

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