An Optimized Sensorless Charge Balance Controller Based on a Damped Current Model for Flyback Converter Operating in DCM

Xiaofeng Zhang, Run Min, Donglai Zhang and Yi Wang
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Xiaofeng Zhang: Harbin Institute of Technology Shenzhen Graduate School; Shenzhen 518055, China
Run Min: School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
Donglai Zhang: Harbin Institute of Technology Shenzhen Graduate School; Shenzhen 518055, China
Yi Wang: Harbin Institute of Technology Shenzhen Graduate School; Shenzhen 518055, China

Energies, 2018, vol. 11, issue 12, 1-15

Abstract: This paper presents an Optimized Sensorless Charge Balance (OSCB) controller based on a damped current model for flyback converter operating in Discontinuous Conduction Mode (DCM). By solving total differential equations of non-ideal transformer currents, the damped current model is derived with consideration of parasitics, leakage inductance of transformer, and the Resistor-Capacitor-Diode (RCD) snubber circuit. Based on the proposed model, current observation and control algorithms of the Sensorless Charge Balance (SCB) controller are optimized, which forms the OSCB control strategy. The average current damping is considered in the equivalent discrete-time small signal model. Furthermore, frequency analyses show that OSCB controller achieves higher closed-loop bandwidth and lower overshoot than a SCB controller, which indicates an improved transient performance. Finally, both OSCB and conventional SCB controllers are experimentally evaluated on a flyback converter prototype.

Keywords: DC-DC converter; flyback; sensorless; DCM; Charge balance control (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: 2018
References: View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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