Study of PI Adaptive Non-Linear Control Strategy Based on CCM/DCM Fast Identification for DC/DC Converter

Abstract:

An isolated three-level H-bridge high-capacity DC/DC converter is a good solution for transferring energy from middle-voltage network to low-voltage network. The transformer can be smaller and lighter with high working frequency, so phase shift Pulse-Width Modulation (PWM) is used by converter. The small signal model has been built by theoretical derivation and verified by simulation when the converter working on Continuous Conduction Mode (CCM) and Discontinuous Conduction Mode (DCM). The analyze results indicated that the mathematic models and dynamic properties were different when converter working in disparate mode. Therefore, the PI parameters of the controller can be hardly chosen to reach the excellent dynamic performance when the converter meets the large disturbance of mode change. That is, you can hardly find a group of PI parameters for converter working well in all load range. Aiming at it, A PI adaptive non-linear control strategy based on CCM/DCM fast identification has been proposed. The fast mode identification was based on inductor voltage characters, and the mode information wound send out in less than a switching period. So, the PI parameters can be instantaneous changed by mode signal to achieve the best dynamic property. The operation principle and analyze result of the control strategy is verified by the prototype at last.

• Periodical: Applied Mechanics and Materials (Volumes 380-384)
• Pages: 302-308
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.380-384.302
• Online since: August 2013
• Authors: Xue Xin Fan, Zhen Xie, Fei Xiao, Rui Tian Wang
• Keywords: Adaptive Control, CCM, DCM, Mode Identification, Three-Level H-Bridge

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