Linearized Discrete Charge Balance Control with Simplified Algorithm for DCM Buck Converter

Run Min, Dian Lyu, Shuai Cheng, Yingshui Sun and Linkai Li
Additional contact information
Run Min: School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
Dian Lyu: School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
Shuai Cheng: Silergy Semiconductor Technology Co., Ltd., Hangzhou 310000, China
Yingshui Sun: Commercial Headquarters, COSCO Shipping Heavy Industry Co., Ltd., Shanghai 200135, China
Linkai Li: School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China

Energies, 2019, vol. 12, issue 16, 1-17

Abstract: In this paper, a linearized discrete charge balance (LDCB) control strategy is proposed for buck converter operating in discontinuous conduction mode (DCM). For DC-DC power converters, discrete charge balance (DCB) control is an attractive approach to improve the output voltage transient response. However, as a non-linear control strategy, the algorithm is complex, which is difficult for implementation. To reduce the complexity, this paper proposes the LDCB control strategy that is derived through linearizing conventional DCB controller. By deriving the differential functions of the DCB control algorithm, the small signal relationship between the input and output of DCB controller is explored. Furthermore, based on the relationship, the LDCB controller is formed through three parallel feed loops to the duty ratio. As a linear control approach, the achieved LDCB controller is greatly simplified for implementation. This not only saves the hardware cost, but also reduces the calculation lag, which provides potential to improve the switching frequency. Besides, since the LDCB controller shares the same small signal model as that of DCB controller, it achieves similar control loop bandwidth and transient performance. Effectiveness of the proposed LDCB control is verified by zero/pole plots, transient analyses and experimental results.

Keywords: charge balance; converter; DC-DC; DCM; estimator; transient response (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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